Add Amazon revenue accounting

CHANGELOG.md

@@ -1,19 +1,7 @@
-# Änderungsprotokoll
+# Changelog
 
-## 2026-09-18
+## 2026-09-23
 
-Seit Commit `0eb32fb` wurden folgende Änderungen vorgenommen:
+- Amazon-Marge als festen Bruttoerlös pro verkauftem Buch ergänzt.
-
+- Amazon-Verkaufszahlen, CSV-Zuordnung und Autorenverteilung in die Abrechnung aufgenommen.
-- Neue geschützte Admin-Seite `author_price.php` für die Berechnung von Autorenpreisen.
+- eBook-CSV-Import, ISBN-Validierung und bestätigungspflichtiges Zurücksetzen der eBook-Abrechnung dokumentiert und abgesichert.
-- Printbücher können per Dropdown ausgewählt werden.
-- Berechnung des Autorenpreises auf Grundlage von Brutto-Preis, 7 % Mehrwertsteuer, Druckkosten und einem frei wählbaren Rabatt.
-- Der Rabatt ist standardmäßig mit 85 % vorbelegt und kann zwischen 0 und 100 % eingegeben werden.
-- Die Ersparnis pro Exemplar wird separat ausgewiesen.
-- Der Autorenrabatt wird als eigener Rechenposten angezeigt.
-- Checkbox ergänzt, um alternativ die kumulierte Autorenmarge aller am Buch beteiligten Autoren als Rabatt zu verwenden.
-- Das manuelle Rabattfeld wird bei aktivierter Margen-Checkbox deaktiviert.
-- Die kumulierte Autorenmarge wird aus allen Buch-Autor-Zuordnungen berechnet.
-- JavaScript für die unmittelbare Aktivierung und Deaktivierung des Rabattfelds ergänzt.
-- Navigation im Admin-Bereich um den Link zum Autorenpreis-Rechner erweitert.
-- CSS für die Anordnung von Rabattfeld und Checkbox ergänzt.
-- PHP-, SQL- und Zugriffsschutz-Prüfungen für die neue Funktion durchgeführt.

README_SETUP.txt

@@ -14,6 +14,20 @@ Einrichtung des Admin-Bereichs
 Die Anwendung verwendet PDO mit echten Prepared Statements, CSRF-Schutz,
 Session-Härtung und getrennte CSS-/JavaScript-Dateien.
 
+ISBN-Eingabe und CSV-Import
+
+Im Webformular werden Print- und eBook-ISBN als gültige ISBN-13 mit
+Bindestrichen erwartet, zum Beispiel 978-3-16-148410-0. Beim CSV-Import
+werden Bindestriche und andere Trennzeichen vor dem Abgleich entfernt.
+Eine CSV-ISBN ohne Bindestriche wird daher gegen die formatierte ISBN in
+TAT erkannt. Bei einem nicht gefundenen Treffer wird die betreffende Zeile
+übersprungen. Alle übersprungenen Zeilen und Gründe werden gesammelt und
+unterhalb des Uploads zusammengefasst angezeigt; gültige Zeilen können
+weiterhin übernommen werden. Bereits gespeicherte eBook-Abrechnungen
+können über die ausdrücklich bestätigungspflichtige Funktion „Gesamte
+eBook-Abrechnung zurücksetzen“ gelöscht und anschließend neu importiert
+werden. Print-Abrechnungen und Stammdaten bleiben dabei unverändert.
+
 CSV-Import für die Abrechnung
 
 Auf der Seite /tat/billing.php kann eine JTL-Verkaufs-CSV hochgeladen werden.

admin.php

@@ -92,8 +92,11 @@ if ($loggedIn) {
                 $ebookPrice = filter_var($_POST['ebook_price'] ?? null, FILTER_VALIDATE_FLOAT);
                 if ($ebookPrice === false || $ebookPrice < 0 || $ebookPrice > 99999999.99) throw new InvalidArgumentException('Der eBook-Preis muss zwischen 0 und 99.999.999,99 liegen.');
                 $ebookPrice = round((float) $ebookPrice, 2);
-                $isbnPrint = postText('isbn_print', 20) ?: null;
+                $amazonGross = filter_var($_POST['amazon_gross'] ?? null, FILTER_VALIDATE_FLOAT);
-                $isbnEbook = postText('isbn_ebook', 20) ?: null;
+                if ($amazonGross === false || $amazonGross < 0 || $amazonGross > 99999999.99) throw new InvalidArgumentException('Die Amazon-Marge muss zwischen 0 und 99.999.999,99 liegen.');
+                $amazonGross = round((float) $amazonGross, 2);
+                $isbnPrint = validateIsbnField(postText('isbn_print', 20), 'Die Print-ISBN');
+                $isbnEbook = validateIsbnField(postText('isbn_ebook', 20), 'Die eBook-ISBN');
                 $authorIds = $_POST['author_id'] ?? [];
                 $margins = $_POST['margin_percent'] ?? [];
                 if ($title === '') throw new InvalidArgumentException('Der Buchtitel ist erforderlich.');
@@ -107,13 +110,13 @@ if ($loggedIn) {
                 }
                 $pdo->beginTransaction();
                 if ($id) {
-                    $statement = $pdo->prepare('UPDATE books SET title = :title, printing_costs = :printing_costs, selling_price = :selling_price, ebook_price = :ebook_price, isbn_print = :isbn_print, isbn_ebook = :isbn_ebook WHERE id = :id');
+                    $statement = $pdo->prepare('UPDATE books SET title = :title, printing_costs = :printing_costs, selling_price = :selling_price, ebook_price = :ebook_price, amazon_gross = :amazon_gross, isbn_print = :isbn_print, isbn_ebook = :isbn_ebook WHERE id = :id');
-                    $statement->execute([':title' => $title, ':printing_costs' => $printingCosts, ':selling_price' => $sellingPrice, ':ebook_price' => $ebookPrice, ':isbn_print' => $isbnPrint, ':isbn_ebook' => $isbnEbook, ':id' => $id]);
+                    $statement->execute([':title' => $title, ':printing_costs' => $printingCosts, ':selling_price' => $sellingPrice, ':ebook_price' => $ebookPrice, ':amazon_gross' => $amazonGross, ':isbn_print' => $isbnPrint, ':isbn_ebook' => $isbnEbook, ':id' => $id]);
                     $bookId = $id;
                     $pdo->prepare('DELETE FROM book_authors WHERE book_id = :book_id')->execute([':book_id' => $bookId]);
                 } else {
-                    $statement = $pdo->prepare('INSERT INTO books (title, printing_costs, selling_price, ebook_price, isbn_print, isbn_ebook) VALUES (:title, :printing_costs, :selling_price, :ebook_price, :isbn_print, :isbn_ebook)');
+                    $statement = $pdo->prepare('INSERT INTO books (title, printing_costs, selling_price, ebook_price, amazon_gross, isbn_print, isbn_ebook) VALUES (:title, :printing_costs, :selling_price, :ebook_price, :amazon_gross, :isbn_print, :isbn_ebook)');
-                    $statement->execute([':title' => $title, ':printing_costs' => $printingCosts, ':selling_price' => $sellingPrice, ':ebook_price' => $ebookPrice, ':isbn_print' => $isbnPrint, ':isbn_ebook' => $isbnEbook]);
+                    $statement->execute([':title' => $title, ':printing_costs' => $printingCosts, ':selling_price' => $sellingPrice, ':ebook_price' => $ebookPrice, ':amazon_gross' => $amazonGross, ':isbn_print' => $isbnPrint, ':isbn_ebook' => $isbnEbook]);
                     $bookId = (int) $pdo->lastInsertId();
                 }
                 $statement = $pdo->prepare('INSERT INTO book_authors (book_id, author_id, margin_percent) VALUES (:book_id, :author_id, :margin_percent)');
@@ -144,14 +147,14 @@ $editAuthorId = filter_var($_GET['edit_author'] ?? null, FILTER_VALIDATE_INT, ['
 $editBookId = filter_var($_GET['edit_book'] ?? null, FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]) ?: null;
 $author = ['id' => '', 'name' => '', 'address' => '', 'postal_code' => '', 'city' => '', 'bank_account' => '', 'bic' => '', 'bank_name' => '', 'paypal_address' => ''];
 if ($editAuthorId) { $statement = $pdo->prepare('SELECT id, name, address, postal_code, city, bank_account, bic, bank_name, paypal_address FROM authors WHERE id = :id'); $statement->execute([':id' => $editAuthorId]); $author = $statement->fetch() ?: $author; }
-$book = ['id' => '', 'title' => '', 'printing_costs' => '0.00', 'selling_price' => '0.00', 'ebook_price' => '0.00', 'isbn_print' => '', 'isbn_ebook' => ''];
+$book = ['id' => '', 'title' => '', 'printing_costs' => '0.00', 'selling_price' => '0.00', 'ebook_price' => '0.00', 'amazon_gross' => '0.00', 'isbn_print' => '', 'isbn_ebook' => ''];
 $bookAuthors = [];
 if ($editBookId) {
-    $statement = $pdo->prepare('SELECT id, title, printing_costs, selling_price, ebook_price, isbn_print, isbn_ebook FROM books WHERE id = :id'); $statement->execute([':id' => $editBookId]); $book = $statement->fetch() ?: $book;
+    $statement = $pdo->prepare('SELECT id, title, printing_costs, selling_price, ebook_price, amazon_gross, isbn_print, isbn_ebook FROM books WHERE id = :id'); $statement->execute([':id' => $editBookId]); $book = $statement->fetch() ?: $book;
     $statement = $pdo->prepare('SELECT ba.author_id, a.name, ba.margin_percent FROM book_authors ba INNER JOIN authors a ON a.id = ba.author_id WHERE ba.book_id = :id ORDER BY a.name'); $statement->execute([':id' => $editBookId]); $bookAuthors = $statement->fetchAll();
 }
 $authors = $pdo->query('SELECT id, name, address, postal_code, city, bank_account, bic, bank_name, paypal_address FROM authors ORDER BY name')->fetchAll();
-$books = $pdo->query('SELECT b.id, b.title, b.printing_costs, b.selling_price, b.ebook_price, b.isbn_print, b.isbn_ebook, GROUP_CONCAT(CONCAT(a.name, " (", ba.margin_percent, " %)" ) ORDER BY a.name SEPARATOR ", ") AS author_summary FROM books b LEFT JOIN book_authors ba ON ba.book_id = b.id LEFT JOIN authors a ON a.id = ba.author_id GROUP BY b.id ORDER BY b.title')->fetchAll();
+$books = $pdo->query('SELECT b.id, b.title, b.printing_costs, b.selling_price, b.ebook_price, b.amazon_gross, b.isbn_print, b.isbn_ebook, GROUP_CONCAT(CONCAT(a.name, " (", ba.margin_percent, " %)" ) ORDER BY a.name SEPARATOR ", ") AS author_summary FROM books b LEFT JOIN book_authors ba ON ba.book_id = b.id LEFT JOIN authors a ON a.id = ba.author_id GROUP BY b.id ORDER BY b.title')->fetchAll();
 $token = csrf();
 ?><!doctype html>
 <html lang="de"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Autorenmargen – Admin</title><link rel="stylesheet" href="css/admin.css"></head>
@@ -160,8 +163,8 @@ $token = csrf();
 <main><?php if ($message): ?><p class="notice"><?= e($message) ?></p><?php endif; ?><?php if ($error): ?><p class="notice error"><?= e($error) ?></p><?php endif; ?>
 <div class="grid">
 <section class="panel"><h2><?= $author['id'] ? 'Autor bearbeiten' : 'Autor anlegen' ?></h2><form method="post"><input type="hidden" name="action" value="save_author"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><input type="hidden" name="author_id" value="<?= e($author['id']) ?>"><label for="author-name">Name</label><input id="author-name" name="name" maxlength="255" value="<?= e($author['name']) ?>" required><label for="address">Adresse</label><input id="address" name="address" maxlength="255" value="<?= e($author['address']) ?>"><label for="postal-code">PLZ</label><input id="postal-code" name="postal_code" maxlength="20" value="<?= e($author['postal_code']) ?>"><label for="city">Ort</label><input id="city" name="city" maxlength="120" value="<?= e($author['city']) ?>"><label for="bank-account">IBAN</label><input id="bank-account" name="bank_account" maxlength="255" value="<?= e($author['bank_account']) ?>"><label for="bic">BIC</label><input id="bic" name="bic" maxlength="20" value="<?= e($author['bic']) ?>"><label for="bank-name">Bankname</label><input id="bank-name" name="bank_name" maxlength="255" value="<?= e($author['bank_name']) ?>"><label for="paypal-address">PayPal-Adresse</label><input id="paypal-address" name="paypal_address" maxlength="255" value="<?= e($author['paypal_address']) ?>"><div class="actions"><button type="submit">Speichern</button><?php if ($author['id']): ?><a class="button secondary" href="admin.php">Abbrechen</a><?php endif; ?></div></form></section>
-<section class="panel"><h2><?= $book['id'] ? 'Buch bearbeiten' : 'Buch anlegen' ?></h2><form method="post"><input type="hidden" name="action" value="save_book"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><input type="hidden" name="book_id" value="<?= e($book['id']) ?>"><label for="book-title">Titel</label><input id="book-title" name="title" maxlength="255" value="<?= e($book['title']) ?>" required><label for="printing-costs">Druckkosten (€)</label><input id="printing-costs" type="number" name="printing_costs" min="0" max="99999999.99" step="0.01" value="<?= e($book['printing_costs']) ?>" required><label for="selling-price">Print-Preis (€)</label><input id="selling-price" type="number" name="selling_price" min="0" max="99999999.99" step="0.01" value="<?= e($book['selling_price']) ?>" required><label for="ebook-price">eBook-Preis (€)</label><input id="ebook-price" type="number" name="ebook_price" min="0" max="99999999.99" step="0.01" value="<?= e($book['ebook_price']) ?>" required><label for="isbn-print">ISBN Print</label><input id="isbn-print" name="isbn_print" maxlength="20" value="<?= e($book['isbn_print']) ?>"><label for="isbn-ebook">ISBN eBook</label><input id="isbn-ebook" name="isbn_ebook" maxlength="20" value="<?= e($book['isbn_ebook']) ?>"><label>Autoren und individuelle Margen</label><div data-author-rows><?php foreach ($bookAuthors as $bookAuthor): ?><div class="author-row" data-author-row><div class="autocomplete"><input type="hidden" name="author_id[]" data-author-id value="<?= (int) $bookAuthor['author_id'] ?>"><input name="author_name[]" data-author-name value="<?= e($bookAuthor['name']) ?>" autocomplete="off" required><ul class="suggestions" data-suggestions></ul></div><div><label>Mar­ge %</label><input type="number" name="margin_percent[]" data-margin min="0" max="100" step="0.01" value="<?= e($bookAuthor['margin_percent']) ?>" required></div><button type="button" class="danger" data-remove-author>Entfernen</button></div><?php endforeach; ?></div><template data-author-template><div class="author-row" data-author-row><div class="autocomplete"><input type="hidden" name="author_id[]" data-author-id><input name="author_name[]" data-author-name autocomplete="off" required><ul class="suggestions" data-suggestions></ul></div><div><label>Mar­ge %</label><input type="number" name="margin_percent[]" data-margin min="0" max="100" step="0.01" required></div><button type="button" class="danger" data-remove-author>Entfernen</button></div></template><div class="actions"><button type="button" class="secondary" data-add-author>Autor hinzufügen</button><button type="submit">Buch speichern</button><?php if ($book['id']): ?><a class="button secondary" href="admin.php">Abbrechen</a><?php endif; ?></div></form></section>
+<section class="panel"><h2><?= $book['id'] ? 'Buch bearbeiten' : 'Buch anlegen' ?></h2><form method="post"><input type="hidden" name="action" value="save_book"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><input type="hidden" name="book_id" value="<?= e($book['id']) ?>"><label for="book-title">Titel</label><input id="book-title" name="title" maxlength="255" value="<?= e($book['title']) ?>" required><label for="printing-costs">Druckkosten (€)</label><input id="printing-costs" type="number" name="printing_costs" min="0" max="99999999.99" step="0.01" value="<?= e($book['printing_costs']) ?>" required><label for="selling-price">Print-Preis (€)</label><input id="selling-price" type="number" name="selling_price" min="0" max="99999999.99" step="0.01" value="<?= e($book['selling_price']) ?>" required><label for="ebook-price">eBook-Preis (€)</label><input id="ebook-price" type="number" name="ebook_price" min="0" max="99999999.99" step="0.01" value="<?= e($book['ebook_price']) ?>" required><label for="amazon-gross">Amazon-Marge (€ brutto pro verkauftem Buch)</label><input id="amazon-gross" type="number" name="amazon_gross" min="0" max="99999999.99" step="0.01" value="<?= e($book['amazon_gross']) ?>" required><label for="isbn-print">ISBN Print</label><input id="isbn-print" name="isbn_print" maxlength="20" value="<?= e($book['isbn_print']) ?>"><label for="isbn-ebook">ISBN eBook</label><input id="isbn-ebook" name="isbn_ebook" maxlength="20" value="<?= e($book['isbn_ebook']) ?>"><label>Autoren und individuelle Margen</label><div data-author-rows><?php foreach ($bookAuthors as $bookAuthor): ?><div class="author-row" data-author-row><div class="autocomplete"><input type="hidden" name="author_id[]" data-author-id value="<?= (int) $bookAuthor['author_id'] ?>"><input name="author_name[]" data-author-name value="<?= e($bookAuthor['name']) ?>" autocomplete="off" required><ul class="suggestions" data-suggestions></ul></div><div><label>Mar­ge %</label><input type="number" name="margin_percent[]" data-margin min="0" max="100" step="0.01" value="<?= e($bookAuthor['margin_percent']) ?>" required></div><button type="button" class="danger" data-remove-author>Entfernen</button></div><?php endforeach; ?></div><template data-author-template><div class="author-row" data-author-row><div class="autocomplete"><input type="hidden" name="author_id[]" data-author-id><input name="author_name[]" data-author-name autocomplete="off" required><ul class="suggestions" data-suggestions></ul></div><div><label>Mar­ge %</label><input type="number" name="margin_percent[]" data-margin min="0" max="100" step="0.01" required></div><button type="button" class="danger" data-remove-author>Entfernen</button></div></template><div class="actions"><button type="button" class="secondary" data-add-author>Autor hinzufügen</button><button type="submit">Buch speichern</button><?php if ($book['id']): ?><a class="button secondary" href="admin.php">Abbrechen</a><?php endif; ?></div></form></section>
 </div>
 <section class="panel"><h2>Autoren</h2><div class="table-wrap"><table><thead><tr><th>Name</th><th>Adresse</th><th>IBAN</th><th>BIC</th><th>Bankname</th><th>PayPal-Adresse</th><th>Aktionen</th></tr></thead><tbody><?php foreach ($authors as $row): ?><tr><td><?= e($row['name']) ?></td><td><?= e(trim($row['address'] . ', ' . $row['postal_code'] . ' ' . $row['city'], ', ')) ?></td><td><?= e($row['bank_account']) ?></td><td><?= e($row['bic']) ?></td><td><?= e($row['bank_name']) ?></td><td><?= e($row['paypal_address']) ?></td><td><a class="button secondary" href="?edit_author=<?= (int) $row['id'] ?>">Bearbeiten</a> <form method="post" class="inline-form" data-confirm="Autor wirklich löschen?"><input type="hidden" name="action" value="delete_author"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><input type="hidden" name="author_id" value="<?= (int) $row['id'] ?>"><button class="danger" type="submit">Löschen</button></form></td></tr><?php endforeach; ?></tbody></table></div></section>
-<section class="panel"><h2>Bücher</h2><div class="table-wrap"><table><thead><tr><th>Titel</th><th>Druckkosten</th><th>Print-Preis</th><th>eBook-Preis</th><th>ISBN Print</th><th>ISBN eBook</th><th>Autoren / Margen</th><th>Aktionen</th></tr></thead><tbody><?php foreach ($books as $row): ?><tr><td><?= e($row['title']) ?></td><td><?= number_format((float) $row['printing_costs'], 2, ',', '.') ?> €</td><td><?= number_format((float) $row['selling_price'], 2, ',', '.') ?> €</td><td><?= number_format((float) $row['ebook_price'], 2, ',', '.') ?> €</td><td><?= e($row['isbn_print']) ?></td><td><?= e($row['isbn_ebook']) ?></td><td><?= e($row['author_summary'] ?? '') ?></td><td><a class="button secondary" href="?edit_book=<?= (int) $row['id'] ?>">Bearbeiten</a> <form method="post" class="inline-form" data-confirm="Buch wirklich löschen?"><input type="hidden" name="action" value="delete_book"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><input type="hidden" name="book_id" value="<?= (int) $row['id'] ?>"><button class="danger" type="submit">Löschen</button></form></td></tr><?php endforeach; ?></tbody></table></div></section>
+<section class="panel"><h2>Bücher</h2><div class="table-wrap"><table><thead><tr><th>Titel</th><th>Druckkosten</th><th>Print-Preis</th><th>eBook-Preis</th><th>Amazon-Marge</th><th>ISBN Print</th><th>ISBN eBook</th><th>Autoren / Margen</th><th>Aktionen</th></tr></thead><tbody><?php foreach ($books as $row): ?><tr><td><?= e($row['title']) ?></td><td><?= number_format((float) $row['printing_costs'], 2, ',', '.') ?> €</td><td><?= number_format((float) $row['selling_price'], 2, ',', '.') ?> €</td><td><?= number_format((float) $row['ebook_price'], 2, ',', '.') ?> €</td><td><?= number_format((float) $row['amazon_gross'], 2, ',', '.') ?> €</td><td><?= e($row['isbn_print']) ?></td><td><?= e($row['isbn_ebook']) ?></td><td><?= e($row['author_summary'] ?? '') ?></td><td><a class="button secondary" href="?edit_book=<?= (int) $row['id'] ?>">Bearbeiten</a> <form method="post" class="inline-form" data-confirm="Buch wirklich löschen?"><input type="hidden" name="action" value="delete_book"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><input type="hidden" name="book_id" value="<?= (int) $row['id'] ?>"><button class="danger" type="submit">Löschen</button></form></td></tr><?php endforeach; ?></tbody></table></div></section>
 </main><script src="scripts/admin.js"></script></body></html>

billing.php

@@ -12,6 +12,7 @@ const DIRECT_RETAINED_RATE = 1.00;
 const CSV_MAX_BYTES = 5242880;
 const CSV_PREVIEW_SESSION_KEY = 'tat_billing_csv_preview';
 const EBOOK_CSV_PREVIEW_SESSION_KEY = 'tat_ebook_csv_preview';
+const EBOOK_CSV_WARNINGS_SESSION_KEY = 'tat_ebook_csv_warnings';
 
 function money(float $value): string
 {
@@ -30,6 +31,19 @@ function normalizeIsbn(string $value): string
     return preg_replace('/[^0-9xX]/', '', trim($value)) ?? '';
 }
 
+function importIsbn(string $value, string $label, int $lineNumber): string
+{
+    $rawValue = trim($value);
+    $normalized = normalizeIsbn($rawValue);
+    if ($normalized === '') {
+        throw new InvalidArgumentException("Fehler in CSV-Zeile {$lineNumber}: {$label} ist leer.");
+    }
+    if (!preg_match('/^(?:97[89][0-9]{10}|[0-9]{9}[0-9xX])$/', $normalized)) {
+        throw new InvalidArgumentException("Fehler in CSV-Zeile {$lineNumber}: {$label} '{$rawValue}' ist keine gültige ISBN-10- oder ISBN-13-Zeichenfolge.");
+    }
+    return $normalized;
+}
+
 function csvChannel(string $customerGroup): ?string
 {
     $group = normalizeCsvValue($customerGroup);
@@ -37,6 +51,7 @@ function csvChannel(string $customerGroup): ?string
         'großhandel', 'grosshandel', 'buchgrosshandel' => 'wholesale',
         'buchhandel' => 'bookseller',
         'endkunden', 'endkunde', 'direktkunden', 'direktkunde', 'direkt', 'privatkunden', 'privatkunde' => 'direct',
+        'amazon', 'amazonmarkt', 'amazon marketplace' => 'amazon',
         default => null,
     };
 }
@@ -106,7 +121,7 @@ function parseCsvUpload(array $upload, PDO $pdo): array
         if ($row === [null] || count(array_filter($row, static fn ($value): bool => trim((string) $value) !== '')) === 0) {
             continue;
         }
-        $isbn = normalizeIsbn((string) ($row[$isbnIndex] ?? ''));
+        $isbn = importIsbn((string) ($row[$isbnIndex] ?? ''), 'ISBN', $lineNumber);
         $group = trim((string) ($row[$groupIndex] ?? ''));
         $channel = csvChannel($group);
         $quantityText = trim((string) ($row[$quantityIndex] ?? ''));
@@ -115,7 +130,8 @@ function parseCsvUpload(array $upload, PDO $pdo): array
             throw new InvalidArgumentException("Fehler in CSV-Zeile {$lineNumber}: ISBN, Kundengruppe oder Menge ist ungültig.");
         }
         if (!isset($booksByIsbn[$isbn])) {
-            throw new InvalidArgumentException("Fehler in CSV-Zeile {$lineNumber}: ISBN {$isbn} ist in TAT nicht als Printbuch angelegt.");
+            $rawIsbn = trim((string) ($row[$isbnIndex] ?? ''));
+            throw new InvalidArgumentException("Fehler in CSV-Zeile {$lineNumber}: ISBN '{$rawIsbn}' (normalisiert: {$isbn}) ist in TAT nicht als Printbuch angelegt.");
         }
         $book = $booksByIsbn[$isbn];
         $bookId = (int) $book['id'];
@@ -179,31 +195,34 @@ function parseEbookCsvUpload(array $upload, PDO $pdo): array
         $booksByIsbn[normalizeIsbn((string) $book['isbn_ebook'])] = $book;
     }
     $aggregated = [];
+    $warnings = [];
     $lineNumber = 1;
     while (($row = fgetcsv($handle, 0, $delimiter)) !== false) {
         $lineNumber++;
         if ($row === [null] || count(array_filter($row, static fn ($value): bool => trim((string) $value) !== '')) === 0) {
             continue;
         }
+        try {
             $dateText = trim((string) ($row[$indexes['verkaufsdatum']] ?? ''));
             $date = DateTimeImmutable::createFromFormat('!Y-m-d', $dateText);
             $dateErrors = DateTimeImmutable::getLastErrors();
             if (!$date || ($dateErrors !== false && ($dateErrors['warning_count'] > 0 || $dateErrors['error_count'] > 0)) || $date->format('Y-m-d') !== $dateText) {
-            throw new InvalidArgumentException("Fehler in eBook-CSV-Zeile {$lineNumber}: Verkaufsdatum muss JJJJ-MM-TT sein.");
+                throw new InvalidArgumentException('Verkaufsdatum muss JJJJ-MM-TT sein.');
             }
             $channel = trim((string) ($row[$indexes['verkaufsweg']] ?? ''));
-        $isbn = normalizeIsbn((string) ($row[$indexes['isbn']] ?? ''));
+            $isbn = importIsbn((string) ($row[$indexes['isbn']] ?? ''), 'ISBN', $lineNumber);
             $revenueText = trim((string) ($row[$indexes['erlös']] ?? ''));
             $revenueText = str_replace(['€', ' '], '', $revenueText);
             if (str_contains($revenueText, ',') && str_contains($revenueText, '.')) {
                 $revenueText = str_replace('.', '', $revenueText);
             }
             $revenue = filter_var(str_replace(',', '.', $revenueText), FILTER_VALIDATE_FLOAT);
-        if ($channel === '' || $isbn === '' || $revenue === false || !is_finite((float) $revenue)) {
+            if ($channel === '' || $revenue === false || !is_finite((float) $revenue)) {
-            throw new InvalidArgumentException("Fehler in eBook-CSV-Zeile {$lineNumber}: Verkaufsweg, ISBN oder Erlös ist ungültig.");
+                throw new InvalidArgumentException('Verkaufsweg, ISBN oder Erlös ist ungültig.');
             }
             if (!isset($booksByIsbn[$isbn])) {
-            throw new InvalidArgumentException("Fehler in eBook-CSV-Zeile {$lineNumber}: ISBN {$isbn} ist in TAT nicht als eBook angelegt.");
+                $rawIsbn = trim((string) ($row[$indexes['isbn']] ?? ''));
+                throw new InvalidArgumentException("ISBN '{$rawIsbn}' (normalisiert: {$isbn}) ist in TAT nicht als eBook angelegt.");
             }
             $book = $booksByIsbn[$isbn];
             $key = (int) $book['id'] . '|' . $date->format('Y-m-d') . '|' . $channel;
@@ -216,16 +235,16 @@ function parseEbookCsvUpload(array $upload, PDO $pdo): array
                 'revenue' => 0.0,
             ];
             $aggregated[$key]['revenue'] += (float) $revenue;
+        } catch (Throwable $exception) {
+            $warnings[] = "Zeile {$lineNumber}: {$exception->getMessage()}";
+        }
     }
     fclose($handle);
-    if (!$aggregated) {
-        throw new InvalidArgumentException('Die eBook-CSV enthält keine verarbeitbaren Verkaufszeilen.');
-    }
     foreach ($aggregated as &$row) {
         $row['revenue'] = round((float) $row['revenue'], 2);
     }
     unset($row);
-    return array_values($aggregated);
+    return ['rows' => array_values($aggregated), 'warnings' => $warnings];
 }
 
 $message = '';
@@ -243,9 +262,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $pdo->beginTransaction();
             $bookCheck = $pdo->prepare('SELECT id FROM books WHERE id = :id AND isbn_print IS NOT NULL AND isbn_print <> ""');
             $statement = $pdo->prepare(
-                'INSERT INTO book_sales (book_id, wholesale_quantity, bookseller_quantity, direct_quantity)
+                'INSERT INTO book_sales (book_id, wholesale_quantity, bookseller_quantity, direct_quantity, amazon_quantity)
-                 VALUES (:book_id, :wholesale, :bookseller, :direct)
+                 VALUES (:book_id, :wholesale, :bookseller, :direct, :amazon)
-                 ON DUPLICATE KEY UPDATE wholesale_quantity = VALUES(wholesale_quantity), bookseller_quantity = VALUES(bookseller_quantity), direct_quantity = VALUES(direct_quantity)'
+                 ON DUPLICATE KEY UPDATE wholesale_quantity = VALUES(wholesale_quantity), bookseller_quantity = VALUES(bookseller_quantity), direct_quantity = VALUES(direct_quantity), amazon_quantity = VALUES(amazon_quantity)'
             );
             foreach ($quantities as $bookId => $values) {
                 $bookId = filter_var($bookId, FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]);
@@ -257,7 +276,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                     throw new InvalidArgumentException('Es können nur Printbücher abgerechnet werden.');
                 }
                 $parsed = [];
-                foreach (['wholesale', 'bookseller', 'direct'] as $channel) {
+                foreach (['wholesale', 'bookseller', 'direct', 'amazon'] as $channel) {
                     $value = filter_var($values[$channel] ?? null, FILTER_VALIDATE_INT, ['options' => ['min_range' => 0, 'max_range' => 1000000000]]);
                     if ($value === false) {
                         throw new InvalidArgumentException('Verkaufszahlen müssen ganze Zahlen ab 0 sein.');
@@ -269,6 +288,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                     ':wholesale' => $parsed['wholesale'],
                     ':bookseller' => $parsed['bookseller'],
                     ':direct' => $parsed['direct'],
+                    ':amazon' => $parsed['amazon'],
                 ]);
             }
             $pdo->commit();
@@ -277,8 +297,21 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $_SESSION[CSV_PREVIEW_SESSION_KEY] = parseCsvUpload($_FILES['sales_csv'] ?? [], $pdo);
             $message = 'CSV-Datei geprüft. Bitte die Vorschau kontrollieren und anschließend bestätigen.';
         } elseif ($action === 'upload_ebook_csv') {
-            $_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY] = parseEbookCsvUpload($_FILES['ebook_sales_csv'] ?? [], $pdo);
+            $result = parseEbookCsvUpload($_FILES['ebook_sales_csv'] ?? [], $pdo);
-            $message = 'eBook-CSV geprüft. Bitte die Vorschau kontrollieren und anschließend bestätigen.';
+            $_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY] = $result['rows'];
+            $_SESSION[EBOOK_CSV_WARNINGS_SESSION_KEY] = $result['warnings'];
+            $message = $result['rows']
+                ? 'eBook-CSV geprüft. Bitte die Vorschau kontrollieren und anschließend bestätigen.'
+                : 'Die eBook-CSV enthält keine importierbaren Zeilen.';
+        } elseif ($action === 'cancel_ebook_csv') {
+            unset($_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY], $_SESSION[EBOOK_CSV_WARNINGS_SESSION_KEY]);
+            $message = 'Die eBook-CSV-Vorschau wurde verworfen. Es wurden keine Abrechnungsdaten geändert.';
+        } elseif ($action === 'reset_ebook_sales') {
+            $pdo->beginTransaction();
+            $deleted = $pdo->exec('DELETE FROM ebook_sales');
+            $pdo->commit();
+            unset($_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY], $_SESSION[EBOOK_CSV_WARNINGS_SESSION_KEY]);
+            $message = "Die eBook-Abrechnung wurde zurückgesetzt. {$deleted} gespeicherte Zeile(n) wurden gelöscht.";
         } elseif ($action === 'confirm_ebook_csv') {
             $preview = $_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY] ?? null;
             if (!is_array($preview) || !$preview) {
@@ -310,7 +343,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 $count++;
             }
             $pdo->commit();
-            unset($_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY]);
+            unset($_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY], $_SESSION[EBOOK_CSV_WARNINGS_SESSION_KEY]);
             $message = "eBook-CSV für {$count} ausgewählte Zeilen übernommen.";
         } elseif ($action === 'confirm_csv') {
             $preview = $_SESSION[CSV_PREVIEW_SESSION_KEY] ?? null;
@@ -326,9 +359,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 $byId[(int) $row['book_id']] = $row;
             }
             $statement = $pdo->prepare(
-                'INSERT INTO book_sales (book_id, wholesale_quantity, bookseller_quantity, direct_quantity)
+                'INSERT INTO book_sales (book_id, wholesale_quantity, bookseller_quantity, direct_quantity, amazon_quantity)
-                 VALUES (:book_id, :wholesale, :bookseller, :direct)
+                 VALUES (:book_id, :wholesale, :bookseller, :direct, :amazon)
-                 ON DUPLICATE KEY UPDATE wholesale_quantity = VALUES(wholesale_quantity), bookseller_quantity = VALUES(bookseller_quantity), direct_quantity = VALUES(direct_quantity)'
+                 ON DUPLICATE KEY UPDATE wholesale_quantity = VALUES(wholesale_quantity), bookseller_quantity = VALUES(bookseller_quantity), direct_quantity = VALUES(direct_quantity), amazon_quantity = VALUES(amazon_quantity)'
             );
             $pdo->beginTransaction();
             $count = 0;
@@ -343,6 +376,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                     ':wholesale' => (int) $row['wholesale'],
                     ':bookseller' => (int) $row['bookseller'],
                     ':direct' => (int) $row['direct'],
+                    ':amazon' => (int) $row['amazon'],
                 ]);
                 $count++;
             }
@@ -364,10 +398,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
 $csvPreview = $_SESSION[CSV_PREVIEW_SESSION_KEY] ?? [];
 $books = $pdo->query(
-    'SELECT b.id, b.title, b.isbn_print, b.isbn_ebook, b.selling_price, b.printing_costs,
+    'SELECT b.id, b.title, b.isbn_print, b.isbn_ebook, b.selling_price, b.printing_costs, b.amazon_gross,
             COALESCE(s.wholesale_quantity, 0) AS wholesale_quantity,
             COALESCE(s.bookseller_quantity, 0) AS bookseller_quantity,
-            COALESCE(s.direct_quantity, 0) AS direct_quantity
+            COALESCE(s.direct_quantity, 0) AS direct_quantity,
+            COALESCE(s.amazon_quantity, 0) AS amazon_quantity
      FROM books b
      LEFT JOIN book_sales s ON s.book_id = b.id
      WHERE b.isbn_print IS NOT NULL AND b.isbn_print <> ""
@@ -375,6 +410,7 @@ $books = $pdo->query(
 )->fetchAll();
 
 $ebookCsvPreview = $_SESSION[EBOOK_CSV_PREVIEW_SESSION_KEY] ?? [];
+$ebookCsvWarnings = $_SESSION[EBOOK_CSV_WARNINGS_SESSION_KEY] ?? [];
 $ebookSales = $pdo->query(
     'SELECT b.id AS book_id, b.title, b.isbn_ebook, es.sale_date, es.sales_channel, es.revenue
      FROM ebook_sales es
@@ -403,26 +439,32 @@ foreach ($books as $book) {
     $wholesaleRevenue = (($netPrice * WHOLESALE_RETAINED_RATE) - $printingCosts) * (int) $book['wholesale_quantity'];
     $booksellerRevenue = (($netPrice * BOOKSELLER_RETAINED_RATE) - $printingCosts) * (int) $book['bookseller_quantity'];
     $directRevenue = (($netPrice * DIRECT_RETAINED_RATE) - $printingCosts) * (int) $book['direct_quantity'];
-    $revenue = $wholesaleRevenue + $booksellerRevenue + $directRevenue;
+    $amazonRevenue = (float) $book['amazon_gross'] * (int) $book['amazon_quantity'];
+    $printRevenue = $wholesaleRevenue + $booksellerRevenue + $directRevenue;
+    $revenue = $printRevenue + $amazonRevenue;
     $totalRevenue += $revenue;
     $authorCalculations = [];
     foreach ($authorsByBook[(int) $book['id']] ?? [] as $author) {
-        $authorNet = $revenue * ((float) $author['margin_percent'] / 100);
+        $authorNet = $printRevenue * ((float) $author['margin_percent'] / 100);
         $authorPayout = $authorNet * (1 + PRINT_VAT_RATE);
-        $totalAuthorPayout += $authorPayout;
+        $amazonAuthorPayout = $amazonRevenue * ((float) $author['margin_percent'] / 100);
+        $totalAuthorPayout += $authorPayout + $amazonAuthorPayout;
         $authorName = (string) $author['name'];
-        $authorSummary[$authorName] ??= ['books' => [], 'print_payout' => 0.0, 'ebook_payout' => 0.0];
+        $authorSummary[$authorName] ??= ['books' => [], 'print_payout' => 0.0, 'amazon_payout' => 0.0, 'ebook_payout' => 0.0];
-        $authorSummary[$authorName]['books'][(int) $book['id']] ??= ['title' => (string) $book['title'], 'wholesale' => 0.0, 'bookseller' => 0.0, 'direct' => 0.0, 'ebook' => 0.0];
+        $authorSummary[$authorName]['books'][(int) $book['id']] ??= ['title' => (string) $book['title'], 'wholesale' => 0.0, 'bookseller' => 0.0, 'direct' => 0.0, 'amazon' => 0.0, 'ebook' => 0.0];
         $authorSummary[$authorName]['books'][(int) $book['id']]['wholesale'] += $wholesaleRevenue * ((float) $author['margin_percent'] / 100) * (1 + PRINT_VAT_RATE);
         $authorSummary[$authorName]['books'][(int) $book['id']]['bookseller'] += $booksellerRevenue * ((float) $author['margin_percent'] / 100) * (1 + PRINT_VAT_RATE);
         $authorSummary[$authorName]['books'][(int) $book['id']]['direct'] += $directRevenue * ((float) $author['margin_percent'] / 100) * (1 + PRINT_VAT_RATE);
+        $authorSummary[$authorName]['books'][(int) $book['id']]['amazon'] += $amazonRevenue * ((float) $author['margin_percent'] / 100);
         $authorSummary[$authorName]['print_payout'] += $authorPayout;
-        $authorCalculations[] = ['name' => $authorName, 'margin_percent' => (float) $author['margin_percent'], 'payout' => $authorPayout];
+        $authorSummary[$authorName]['amazon_payout'] += $amazonAuthorPayout;
+        $authorCalculations[] = ['name' => $authorName, 'margin_percent' => (float) $author['margin_percent'], 'payout' => $authorPayout + $amazonAuthorPayout];
     }
     $calculations[(int) $book['id']] = [
         'wholesale_revenue' => $wholesaleRevenue,
         'bookseller_revenue' => $booksellerRevenue,
         'direct_revenue' => $directRevenue,
+        'amazon_revenue' => $amazonRevenue,
         'revenue' => $revenue,
         'authors' => $authorCalculations,
     ];
@@ -439,7 +481,7 @@ foreach ($ebookSales as $sale) {
         $payout = $revenue * ((float) $author['margin_percent'] / 100);
         $ebookTotalAuthorPayout += $payout;
         $authorName = (string) $author['name'];
-        $authorSummary[$authorName] ??= ['books' => [], 'print_payout' => 0.0, 'ebook_payout' => 0.0];
+        $authorSummary[$authorName] ??= ['books' => [], 'print_payout' => 0.0, 'amazon_payout' => 0.0, 'ebook_payout' => 0.0];
         $authorSummary[$authorName]['books'][(int) $sale['book_id']] ??= ['title' => (string) $sale['title'], 'wholesale' => 0.0, 'bookseller' => 0.0, 'direct' => 0.0, 'ebook' => 0.0];
         $authorSummary[$authorName]['books'][(int) $sale['book_id']]['ebook'] += $payout;
         $authorSummary[$authorName]['ebook_payout'] += $payout;
@@ -466,19 +508,22 @@ $token = csrf();
 <body>
 <header><h1>Autorenmargen – Admin</h1><nav><a class="button secondary" href="admin.php">Stammdaten</a><form method="post" action="admin.php" class="inline-form"><input type="hidden" name="action" value="logout"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><button class="secondary" type="submit">Abmelden</button></form></nav></header>
 <main>
-<section class="panel"><h2>CSV-Abrechnung importieren</h2><p class="muted">Erwartete Spalten: Kundengruppe, ISBN und Menge. Unterstützt werden Semikolon-, Komma- und Tabulator-getrennte CSV-Dateien. Kundengruppen werden so zugeordnet: Großhandel → Großhandel, Buchhandel → Buchhandel, Endkunden/Direktkunden → Direkt.</p>
+<section class="panel"><h2>CSV-Abrechnung importieren</h2><p class="muted">Erwartete Spalten: Kundengruppe, ISBN und Menge. Unterstützt werden Semikolon-, Komma- und Tabulator-getrennte CSV-Dateien. Kundengruppen werden so zugeordnet: Großhandel → Großhandel, Buchhandel → Buchhandel, Endkunden/Direktkunden → Direkt, Amazon → Amazon.</p>
 <?php if ($message): ?><p class="notice"><?= e($message) ?></p><?php endif; ?>
 <?php if ($error): ?><p class="notice error"><?= e($error) ?></p><?php endif; ?>
 <form method="post" enctype="multipart/form-data"><input type="hidden" name="action" value="upload_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><label for="sales-csv">JTL-Verkaufs-CSV</label><input id="sales-csv" type="file" name="sales_csv" accept=".csv,text/csv" required><div class="actions"><button type="submit">CSV prüfen und Vorschau anzeigen</button></div></form></section>
 <section class="panel"><h2>eBook-CSV importieren</h2><p class="muted">Erwartete Spalten: Verkaufsdatum, Verkaufsweg, ISBN, Titel und Erlös. Der Erlös wird ohne Abzüge mit der Autorenmarge verrechnet; der Verkaufsweg bleibt erhalten. Mehrere Zeilen mit gleichem Datum, eBook und Verkaufsweg werden zusammengefasst.</p><form method="post" enctype="multipart/form-data"><input type="hidden" name="action" value="upload_ebook_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><label for="ebook-sales-csv">Distributor-eBook-CSV</label><input id="ebook-sales-csv" type="file" name="ebook_sales_csv" accept=".csv,text/csv" required><div class="actions"><button type="submit">eBook-CSV prüfen und Vorschau anzeigen</button></div></form></section>
-<?php if ($ebookCsvPreview): ?><section class="panel"><h2>eBook-CSV-Vorschau</h2><p class="muted">Nur ausgewählte Zeilen werden übernommen. Bereits gespeicherte Daten mit identischem eBook, Verkaufsdatum und Verkaufsweg werden ersetzt.</p><form method="post"><input type="hidden" name="action" value="confirm_ebook_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="table-wrap"><table class="billing-table"><thead><tr><th>Übernehmen</th><th>Verkaufsdatum</th><th>Verkaufsweg</th><th>eBook</th><th>ISBN eBook</th><th>Erlös</th></tr></thead><tbody><?php foreach ($ebookCsvPreview as $index => $row): ?><tr><td><input type="checkbox" name="ebook_selected[]" value="<?= (int) $index ?>" checked></td><td><?= e($row['sale_date']) ?></td><td><?= e($row['sales_channel']) ?></td><td><?= e($row['title']) ?></td><td><?= e($row['isbn_ebook']) ?></td><td><?= money((float) $row['revenue']) ?></td></tr><?php endforeach; ?></tbody></table></div><div class="actions"><button type="submit">Ausgewählte eBook-Daten übernehmen</button></div></form></section><?php endif; ?>
+<?php if ($ebookCsvWarnings): ?><section class="panel"><h2>Übersprungene eBook-CSV-Zeilen</h2><p class="notice error"><?= count($ebookCsvWarnings) ?> Zeile(n) wurden übersprungen. Die übrigen gültigen Zeilen können übernommen werden.</p><ul><?php foreach ($ebookCsvWarnings as $warning): ?><li><?= e($warning) ?></li><?php endforeach; ?></ul></section><?php endif; ?>
-<?php if ($csvPreview): ?><section class="panel"><h2>CSV-Vorschau</h2><p class="muted">Die Mengen werden je ISBN und Kundengruppe zusammengefasst. Nur ausgewählte Zeilen werden beim Bestätigen übernommen; die dort gespeicherten Mengen werden ersetzt.</p><form method="post"><input type="hidden" name="action" value="confirm_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="table-wrap"><table class="billing-table"><thead><tr><th>Übernehmen</th><th>Buch</th><th>ISBN Print</th><th>Großhandel</th><th>Buchhandel</th><th>Direkt</th><th>CSV-Zeilen</th></tr></thead><tbody><?php foreach ($csvPreview as $row): ?><tr><td><input type="checkbox" name="selected[]" value="<?= (int) $row['book_id'] ?>" checked></td><td><?= e($row['title']) ?></td><td><?= e($row['isbn_print']) ?></td><td><?= (int) $row['wholesale'] ?></td><td><?= (int) $row['bookseller'] ?></td><td><?= (int) $row['direct'] ?></td><td><?= (int) $row['source_rows'] ?></td></tr><?php endforeach; ?></tbody></table></div><div class="actions"><button type="submit">Ausgewählte CSV-Daten übernehmen</button></div></form></section><?php endif; ?>
+<?php if ($ebookCsvPreview): ?><section class="panel"><h2>eBook-CSV-Vorschau</h2><p class="muted">Nur ausgewählte Zeilen werden übernommen. Bereits gespeicherte Daten mit identischem eBook, Verkaufsdatum und Verkaufsweg werden ersetzt.</p><form method="post"><input type="hidden" name="action" value="confirm_ebook_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="table-wrap"><table class="billing-table"><thead><tr><th>Übernehmen</th><th>Verkaufsdatum</th><th>Verkaufsweg</th><th>eBook</th><th>ISBN eBook</th><th>Erlös</th></tr></thead><tbody><?php foreach ($ebookCsvPreview as $index => $row): ?><tr><td><input type="checkbox" name="ebook_selected[]" value="<?= (int) $index ?>" checked></td><td><?= e($row['sale_date']) ?></td><td><?= e($row['sales_channel']) ?></td><td><?= e($row['title']) ?></td><td><?= e($row['isbn_ebook']) ?></td><td><?= money((float) $row['revenue']) ?></td></tr><?php endforeach; ?></tbody></table></div><div class="actions"><button type="submit">Ausgewählte eBook-Daten übernehmen</button></div></form><form method="post" class="inline-form"><input type="hidden" name="action" value="cancel_ebook_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="actions"><button class="secondary" type="submit">Vorschau verwerfen</button></div></form></section><?php endif; ?>
+<?php if ($ebookSales): ?><section class="panel"><h2>eBook-Abrechnung zurücksetzen</h2><p class="notice error">Damit werden alle bereits gespeicherten eBook-Abrechnungszeilen gelöscht. Bücher, Autoren, Margen und Print-Abrechnungen bleiben erhalten.</p><form method="post" data-confirm="Wirklich alle gespeicherten eBook-Abrechnungsdaten löschen? Dieser Vorgang kann nicht rückgängig gemacht werden."><input type="hidden" name="action" value="reset_ebook_sales"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="actions"><button class="danger" type="submit">Gesamte eBook-Abrechnung zurücksetzen</button></div></form></section><?php endif; ?>
+<?php if ($csvPreview): ?><section class="panel"><h2>CSV-Vorschau</h2><p class="muted">Die Mengen werden je ISBN und Kundengruppe zusammengefasst. Nur ausgewählte Zeilen werden beim Bestätigen übernommen; die dort gespeicherten Mengen werden ersetzt.</p><form method="post"><input type="hidden" name="action" value="confirm_csv"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="table-wrap"><table class="billing-table"><thead><tr><th>Übernehmen</th><th>Buch</th><th>ISBN Print</th><th>Großhandel</th><th>Buchhandel</th><th>Direkt</th><th>Amazon</th><th>CSV-Zeilen</th></tr></thead><tbody><?php foreach ($csvPreview as $row): ?><tr><td><input type="checkbox" name="selected[]" value="<?= (int) $row['book_id'] ?>" checked></td><td><?= e($row['title']) ?></td><td><?= e($row['isbn_print']) ?></td><td><?= (int) $row['wholesale'] ?></td><td><?= (int) $row['bookseller'] ?></td><td><?= (int) $row['direct'] ?></td><td><?= (int) $row['amazon'] ?></td><td><?= (int) $row['source_rows'] ?></td></tr><?php endforeach; ?></tbody></table></div><div class="actions"><button type="submit">Ausgewählte CSV-Daten übernehmen</button></div></form></section><?php endif; ?>
 <section class="panel"><h2>Manuelle Verkaufszahlen</h2><p class="muted">Es werden nur Bücher mit Print-ISBN abgerechnet. eBook-only-Bücher bleiben bis zur separaten eBook-Logik ausgeschlossen.</p>
-<form method="post"><input type="hidden" name="action" value="save_sales"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="table-wrap"><table class="billing-table"><thead><tr><th>Buch</th><th>Verkaufspreis</th><th>Druckkosten</th><th>ISBN Print</th><th>Großhandel</th><th>Buchhandel</th><th>Direkt</th></tr></thead><tbody>
+<form method="post"><input type="hidden" name="action" value="save_sales"><input type="hidden" name="csrf_token" value="<?= e($token) ?>"><div class="table-wrap"><table class="billing-table"><thead><tr><th>Buch</th><th>Verkaufspreis</th><th>Amazon-Marge</th><th>Druckkosten</th><th>ISBN Print</th><th>Großhandel</th><th>Buchhandel</th><th>Direkt</th><th>Amazon</th></tr></thead><tbody>
-<?php foreach ($books as $book): ?><tr><td><strong><?= e($book['title']) ?></strong></td><td><?= money((float) $book['selling_price']) ?></td><td><?= money((float) $book['printing_costs']) ?></td><td><?= e($book['isbn_print']) ?></td><td><label class="visually-hidden" for="wholesale-<?= (int) $book['id'] ?>">Großhandel für <?= e($book['title']) ?></label><input id="wholesale-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][wholesale]" min="0" max="1000000000" step="1" value="<?= (int) $book['wholesale_quantity'] ?>" required></td><td><label class="visually-hidden" for="bookseller-<?= (int) $book['id'] ?>">Buchhandel für <?= e($book['title']) ?></label><input id="bookseller-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][bookseller]" min="0" max="1000000000" step="1" value="<?= (int) $book['bookseller_quantity'] ?>" required></td><td><label class="visually-hidden" for="direct-<?= (int) $book['id'] ?>">Direkt für <?= e($book['title']) ?></label><input id="direct-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][direct]" min="0" max="1000000000" step="1" value="<?= (int) $book['direct_quantity'] ?>" required></td></tr><?php endforeach; ?>
+<?php foreach ($books as $book): ?><tr><td><strong><?= e($book['title']) ?></strong></td><td><?= money((float) $book['selling_price']) ?></td><td><?= money((float) $book['amazon_gross']) ?></td><td><?= money((float) $book['printing_costs']) ?></td><td><?= e($book['isbn_print']) ?></td><td><label class="visually-hidden" for="wholesale-<?= (int) $book['id'] ?>">Großhandel für <?= e($book['title']) ?></label><input id="wholesale-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][wholesale]" min="0" max="1000000000" step="1" value="<?= (int) $book['wholesale_quantity'] ?>" required></td><td><label class="visually-hidden" for="bookseller-<?= (int) $book['id'] ?>">Buchhandel für <?= e($book['title']) ?></label><input id="bookseller-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][bookseller]" min="0" max="1000000000" step="1" value="<?= (int) $book['bookseller_quantity'] ?>" required></td><td><label class="visually-hidden" for="direct-<?= (int) $book['id'] ?>">Direkt für <?= e($book['title']) ?></label><input id="direct-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][direct]" min="0" max="1000000000" step="1" value="<?= (int) $book['direct_quantity'] ?>" required></td><td><label class="visually-hidden" for="amazon-<?= (int) $book['id'] ?>">Amazon für <?= e($book['title']) ?></label><input id="amazon-<?= (int) $book['id'] ?>" type="number" name="quantity[<?= (int) $book['id'] ?>][amazon]" min="0" max="1000000000" step="1" value="<?= (int) $book['amazon_quantity'] ?>" required></td></tr><?php endforeach; ?>
-<?php if (!$books): ?><tr><td colspan="7">Es sind keine abrechenbaren Printbücher vorhanden.</td></tr><?php endif; ?></tbody></table></div><div class="actions"><button type="submit">Verkaufszahlen speichern und abrechnen</button></div></form></section>
+<?php if (!$books): ?><tr><td colspan="9">Es sind keine abrechenbaren Printbücher vorhanden.</td></tr><?php endif; ?></tbody></table></div><div class="actions"><button type="submit">Verkaufszahlen speichern und abrechnen</button></div></form></section>
-<?php if ($authorSummary): ?><?php ksort($authorSummary, SORT_NATURAL | SORT_FLAG_CASE); ?><section class="panel"><h2>Auswertung nach Autoren</h2><p class="muted">Je Autor wird jedes Buch separat nach Großhandel, Buchhandel, Direkt und eBook ausgewiesen.</p><div class="table-wrap"><table class="billing-table"><thead><tr><th>Autor</th><th>Buch</th><th>Großhandel</th><th>Buchhandel</th><th>Direkt</th><th>eBook</th><th>Gesamt</th></tr></thead><tbody><?php foreach ($authorSummary as $authorName => $summary): ?><tr><th colspan="2"><?= e($authorName) ?></th><th><?= money(array_sum(array_column($summary['books'], 'wholesale'))) ?></th><th><?= money(array_sum(array_column($summary['books'], 'bookseller'))) ?></th><th><?= money(array_sum(array_column($summary['books'], 'direct'))) ?></th><th><?= money($summary['ebook_payout']) ?></th><th><?= money($summary['print_payout'] + $summary['ebook_payout']) ?></th></tr><?php foreach ($summary['books'] as $bookSummary): ?><tr><td></td><td><?= e($bookSummary['title']) ?></td><td><?= money($bookSummary['wholesale']) ?></td><td><?= money($bookSummary['bookseller']) ?></td><td><?= money($bookSummary['direct']) ?></td><td><?= money($bookSummary['ebook']) ?></td><td><?= money($bookSummary['wholesale'] + $bookSummary['bookseller'] + $bookSummary['direct'] + $bookSummary['ebook']) ?></td></tr><?php endforeach; ?><?php endforeach; ?></tbody><tfoot><tr><th colspan="2">Gesamt</th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'wholesale')), $authorSummary))) ?></th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'bookseller')), $authorSummary))) ?></th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'direct')), $authorSummary))) ?></th><th><?= money($ebookTotalAuthorPayout) ?></th><th><?= money($totalAuthorPayout + $ebookTotalAuthorPayout) ?></th></tr></tfoot></table></div></section><?php endif; ?>
+<?php if ($authorSummary): ?><?php ksort($authorSummary, SORT_NATURAL | SORT_FLAG_CASE); ?><section class="panel"><h2>Auswertung nach Autoren</h2><p class="muted">Je Autor wird jedes Buch separat nach Großhandel, Buchhandel, Direkt, Amazon und eBook ausgewiesen.</p><div class="table-wrap"><table class="billing-table"><thead><tr><th>Autor</th><th>Buch</th><th>Großhandel</th><th>Buchhandel</th><th>Direkt</th><th>Amazon</th><th>eBook</th><th>Gesamt</th></tr></thead><tbody><?php foreach ($authorSummary as $authorName => $summary): ?><tr><th colspan="2"><?= e($authorName) ?></th><th><?= money(array_sum(array_column($summary['books'], 'wholesale'))) ?></th><th><?= money(array_sum(array_column($summary['books'], 'bookseller'))) ?></th><th><?= money(array_sum(array_column($summary['books'], 'direct'))) ?></th><th><?= money($summary['amazon_payout']) ?></th><th><?= money($summary['ebook_payout']) ?></th><th><?= money($summary['print_payout'] + $summary['amazon_payout'] + $summary['ebook_payout']) ?></th></tr><?php foreach ($summary['books'] as $bookSummary): ?><tr><td></td><td><?= e($bookSummary['title']) ?></td><td><?= money($bookSummary['wholesale']) ?></td><td><?= money($bookSummary['bookseller']) ?></td><td><?= money($bookSummary['direct']) ?></td><td><?= money($bookSummary['amazon']) ?></td><td><?= money($bookSummary['ebook']) ?></td><td><?= money($bookSummary['wholesale'] + $bookSummary['bookseller'] + $bookSummary['direct'] + $bookSummary['amazon'] + $bookSummary['ebook']) ?></td></tr><?php endforeach; ?><?php endforeach; ?></tbody><tfoot><tr><th colspan="2">Gesamt</th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'wholesale')), $authorSummary))) ?></th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'bookseller')), $authorSummary))) ?></th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'direct')), $authorSummary))) ?></th><th><?= money(array_sum(array_map(static fn (array $summary): float => array_sum(array_column($summary['books'], 'amazon')), $authorSummary))) ?></th><th><?= money($ebookTotalAuthorPayout) ?></th><th><?= money($totalAuthorPayout + $ebookTotalAuthorPayout) ?></th></tr></tfoot></table></div></section><?php endif; ?>
-<?php if ($books): ?><section class="panel"><h2>Berechnung nach Buch</h2><p class="muted">Die Zwischenwerte werden ungerundet berechnet und erst für die Anzeige auf Cent gerundet.</p><div class="table-wrap"><table class="billing-table"><thead><tr><th>Buch</th><th>Erlös Großhandel</th><th>Erlös Buchhandel</th><th>Erlös Direkt</th><th>Gesamterlös</th><th>Autorenauszahlung</th></tr></thead><tbody><?php foreach ($books as $book): $calculation = $calculations[(int) $book['id']]; ?><tr><td><strong><?= e($book['title']) ?></strong></td><td><?= money($calculation['wholesale_revenue']) ?></td><td><?= money($calculation['bookseller_revenue']) ?></td><td><?= money($calculation['direct_revenue']) ?></td><td><?= money($calculation['revenue']) ?></td><td><?php if ($calculation['authors']): ?><?php foreach ($calculation['authors'] as $author): ?><div><?= e($author['name']) ?> (<?= number_format($author['margin_percent'], 2, ',', '.') ?> %): <?= money($author['payout']) ?></div><?php endforeach; ?><?php else: ?><span class="muted">Kein Autor zugewiesen</span><?php endif; ?></td></tr><?php endforeach; ?></tbody><tfoot><tr><th colspan="4">Gesamt</th><th><?= money($totalRevenue) ?></th><th><?= money($totalAuthorPayout) ?></th></tr></tfoot></table></div></section><?php endif; ?>
+<?php if ($books): ?><section class="panel"><h2>Berechnung nach Buch</h2><p class="muted">Die Zwischenwerte werden ungerundet berechnet und erst für die Anzeige auf Cent gerundet.</p><div class="table-wrap"><table class="billing-table"><thead><tr><th>Buch</th><th>Erlös Großhandel</th><th>Erlös Buchhandel</th><th>Erlös Direkt</th><th>Erlös Amazon</th><th>Gesamterlös</th><th>Autorenauszahlung</th></tr></thead><tbody><?php foreach ($books as $book): $calculation = $calculations[(int) $book['id']]; ?><tr><td><strong><?= e($book['title']) ?></strong></td><td><?= money($calculation['wholesale_revenue']) ?></td><td><?= money($calculation['bookseller_revenue']) ?></td><td><?= money($calculation['direct_revenue']) ?></td><td><?= money($calculation['amazon_revenue']) ?></td><td><?= money($calculation['revenue']) ?></td><td><?php if ($calculation['authors']): ?><?php foreach ($calculation['authors'] as $author): ?><div><?= e($author['name']) ?> (<?= number_format($author['margin_percent'], 2, ',', '.') ?> %): <?= money($author['payout']) ?></div><?php endforeach; ?><?php else: ?><span class="muted">Kein Autor zugewiesen</span><?php endif; ?></td></tr><?php endforeach; ?></tbody><tfoot><tr><th colspan="5">Gesamt</th><th><?= money($totalRevenue) ?></th><th><?= money($totalAuthorPayout) ?></th></tr></tfoot></table></div></section><?php endif; ?>
 <?php if ($ebookCalculations): ?><section class="panel"><h2>eBook-Berechnung</h2><p class="muted">Autorenanteil = Erlös × Autorenmarge / 100. Es werden keine Druck-, Vertriebs- oder sonstigen Kosten abgezogen.</p><div class="table-wrap"><table class="billing-table"><thead><tr><th>Verkaufsdatum</th><th>Verkaufsweg</th><th>eBook</th><th>ISBN eBook</th><th>Erlös</th><th>Autorenanteil</th></tr></thead><tbody><?php foreach ($ebookCalculations as $calculation): ?><tr><td><?= e($calculation['sale_date']) ?></td><td><?= e($calculation['sales_channel']) ?></td><td><strong><?= e($calculation['title']) ?></strong></td><td><?= e($calculation['isbn_ebook']) ?></td><td><?= money($calculation['revenue']) ?></td><td><?php if ($calculation['authors']): ?><?php foreach ($calculation['authors'] as $author): ?><div><?= e($author['name']) ?> (<?= number_format($author['margin_percent'], 2, ',', '.') ?> %): <?= money($author['payout']) ?></div><?php endforeach; ?><?php else: ?><span class="muted">Kein Autor zugewiesen</span><?php endif; ?></td></tr><?php endforeach; ?></tbody><tfoot><tr><th colspan="4">Gesamt</th><th><?= money($ebookTotalRevenue) ?></th><th><?= money($ebookTotalAuthorPayout) ?></th></tr></tfoot></table></div></section><?php endif; ?>
 </main>
+<script src="scripts/admin.js"></script>
 </body></html>

inc/admin_bootstrap.php

@@ -76,6 +76,33 @@ function postText(string $key, int $maxLength): string
     return $value;
 }
 
+function validateIsbnField(string $value, string $label): ?string
+{
+    $value = trim($value);
+    if ($value === '') {
+        return null;
+    }
+    if (!preg_match('/^97[89](?:-[0-9]+)+$/', $value)) {
+        throw new InvalidArgumentException($label . ' muss als ISBN-13 mit Bindestrichen eingegeben werden, zum Beispiel 978-3-16-148410-0.');
+    }
+
+    $digits = str_replace('-', '', $value);
+    if (strlen($digits) !== 13) {
+        throw new InvalidArgumentException($label . ' muss genau 13 Ziffern enthalten.');
+    }
+
+    $sum = 0;
+    for ($index = 0; $index < 12; $index++) {
+        $sum += (int) $digits[$index] * ($index % 2 === 0 ? 1 : 3);
+    }
+    $checkDigit = (10 - ($sum % 10)) % 10;
+    if ((int) $digits[12] !== $checkDigit) {
+        throw new InvalidArgumentException($label . ' enthält eine ungültige Prüfziffer.');
+    }
+
+    return $value;
+}
+
 function redirectAdmin(): never
 {
     header('Location: admin.php');

migrations/003_add_amazon_revenue.sql

@@ -0,0 +1,7 @@
+ALTER TABLE books
+    ADD COLUMN IF NOT EXISTS amazon_gross DECIMAL(10,2) NOT NULL DEFAULT 0.00
+    AFTER ebook_price;
+
+ALTER TABLE book_sales
+    ADD COLUMN IF NOT EXISTS amazon_quantity INT UNSIGNED NOT NULL DEFAULT 0
+    AFTER direct_quantity;

scripts/admin.js

@@ -1,4 +1,9 @@
 (() => {
+  document.addEventListener('submit', event => {
+    const message = event.target.dataset.confirm;
+    if (message && !window.confirm(message)) event.preventDefault();
+  });
+
   const root = document.querySelector('[data-admin-app]');
   if (!root) return;
 
@@ -48,9 +53,5 @@
   root.addEventListener('click', event => {
     if (event.target.matches('[data-remove-author]')) event.target.closest('[data-author-row]').remove();
   });
-  document.addEventListener('submit', event => {
-    const message = event.target.dataset.confirm;
-    if (message && !window.confirm(message)) event.preventDefault();
-  });
   root.querySelectorAll('[data-author-row]').forEach(bindSearch);
 })();

tat_schema.sql

@@ -30,6 +30,7 @@ CREATE TABLE IF NOT EXISTS books (
     printing_costs DECIMAL(10,2) NOT NULL DEFAULT 0.00,
     selling_price DECIMAL(10,2) NOT NULL DEFAULT 0.00,
     ebook_price DECIMAL(10,2) NOT NULL DEFAULT 0.00,
+    amazon_gross DECIMAL(10,2) NOT NULL DEFAULT 0.00,
     isbn_print VARCHAR(20) NULL,
     isbn_ebook VARCHAR(20) NULL,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
@@ -55,6 +56,7 @@ CREATE TABLE IF NOT EXISTS book_sales (
     wholesale_quantity INT UNSIGNED NOT NULL DEFAULT 0,
     bookseller_quantity INT UNSIGNED NOT NULL DEFAULT 0,
     direct_quantity INT UNSIGNED NOT NULL DEFAULT 0,
+    amazon_quantity INT UNSIGNED NOT NULL DEFAULT 0,
     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     PRIMARY KEY (book_id),
     CONSTRAINT fk_book_sales_book FOREIGN KEY (book_id) REFERENCES books (id) ON DELETE CASCADE