Add configurable author price calculator
This commit is contained in:
ZeroIchiro
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<?php
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declare(strict_types=1);
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require_once __DIR__ . '/inc/admin_bootstrap.php';
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requireAdmin();
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const AUTHOR_PRICE_VAT_RATE = 0.07;
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const DEFAULT_AUTHOR_DISCOUNT_PERCENT = 85.0;
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function authorPriceMoney(float $value): string
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{
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return number_format($value, 2, ',', '.') . ' €';
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}
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$books = $pdo->query(
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'SELECT b.id, b.title, b.selling_price, b.printing_costs, b.isbn_print,
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COALESCE(SUM(ba.margin_percent), 0) AS author_margin_percent
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FROM books b
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LEFT JOIN book_authors ba ON ba.book_id = b.id
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WHERE b.isbn_print IS NOT NULL AND b.isbn_print <> ""
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GROUP BY b.id
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ORDER BY b.title'
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)->fetchAll();
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$selectedId = filter_var($_GET['book_id'] ?? null, FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]) ?: null;
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$useAuthorMargin = ($_GET['use_author_margin'] ?? '') === '1';
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$discountInput = $_GET['discount_percent'] ?? (string) DEFAULT_AUTHOR_DISCOUNT_PERCENT;
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$discountPercent = filter_var($discountInput, FILTER_VALIDATE_FLOAT);
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$discountError = $discountPercent === false || $discountPercent < 0 || $discountPercent > 100;
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if ($discountError) {
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$discountPercent = DEFAULT_AUTHOR_DISCOUNT_PERCENT;
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}
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$discountRate = (float) $discountPercent / 100;
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$retainedRate = 1 - $discountRate;
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$selectedBook = null;
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foreach ($books as $book) {
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if ((int) $book['id'] === $selectedId) {
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$selectedBook = $book;
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break;
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}
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}
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$calculation = null;
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if ($selectedBook !== null) {
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if ($useAuthorMargin) {
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$discountPercent = (float) $selectedBook['author_margin_percent'];
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$discountError = false;
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}
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$discountRate = (float) $discountPercent / 100;
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$retainedRate = 1 - $discountRate;
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$grossPrice = (float) $selectedBook['selling_price'];
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$printingCosts = (float) $selectedBook['printing_costs'];
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$netPrice = $grossPrice / (1 + AUTHOR_PRICE_VAT_RATE);
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$revenueBeforeAuthorDiscount = $netPrice - $printingCosts;
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$authorDiscount = $revenueBeforeAuthorDiscount * $discountRate;
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$retainedRevenue = $revenueBeforeAuthorDiscount * $retainedRate;
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$authorPriceNet = $printingCosts + $retainedRevenue;
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$authorPriceVat = $authorPriceNet * AUTHOR_PRICE_VAT_RATE;
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$authorPriceGross = $authorPriceNet + $authorPriceVat;
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$saving = $grossPrice - $authorPriceGross;
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$calculation = [
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'gross_price' => $grossPrice,
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'net_price' => $netPrice,
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'printing_costs' => $printingCosts,
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'revenue_before_author_discount' => $revenueBeforeAuthorDiscount,
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'author_discount' => $authorDiscount,
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'discount_percent' => (float) $discountPercent,
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'retained_percent' => $retainedRate * 100,
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'use_author_margin' => $useAuthorMargin,
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'author_margin_percent' => (float) $selectedBook['author_margin_percent'],
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'retained_revenue' => $retainedRevenue,
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'author_price_net' => $authorPriceNet,
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'author_price_vat' => $authorPriceVat,
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'author_price_gross' => $authorPriceGross,
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'saving' => $saving,
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];
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}
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$token = csrf();
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?><!doctype html>
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<html lang="de">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<title>Autorenpreis-Rechner</title>
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<link rel="stylesheet" href="css/admin.css">
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</head>
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<body>
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<header>
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<h1>Autorenpreis-Rechner</h1>
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<nav>
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<a class="button secondary" href="admin.php">Stammdaten</a>
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<a class="button secondary" href="billing.php">Abrechnung</a>
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<form method="post" action="admin.php" class="inline-form">
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<input type="hidden" name="action" value="logout">
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<input type="hidden" name="csrf_token" value="<?= e($token) ?>">
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<button class="secondary" type="submit">Abmelden</button>
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</form>
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</nav>
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</header>
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<main>
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<section class="panel">
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<h2>Buch auswählen</h2>
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<form method="get">
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<label for="book-id">Printbuch</label>
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<select id="book-id" name="book_id" required>
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<option value="">Bitte auswählen</option>
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<?php foreach ($books as $book): ?>
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<option value="<?= (int) $book['id'] ?>"<?= (int) $book['id'] === $selectedId ? ' selected' : '' ?>><?= e($book['title']) ?> (<?= e($book['isbn_print']) ?>)</option>
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<?php endforeach; ?>
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</select>
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<div class="discount-input-row">
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<div>
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<label for="discount-percent">Autorenrabatt (%)</label>
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<input id="discount-percent" type="number" name="discount_percent" min="0" max="100" step="0.01" value="<?= e(number_format((float) $discountPercent, 2, '.', '')) ?>"<?= $useAuthorMargin ? ' disabled' : '' ?> required>
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</div>
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<label class="checkbox-label" for="use-author-margin"><input id="use-author-margin" type="checkbox" name="use_author_margin" value="1"<?= $useAuthorMargin ? ' checked' : '' ?>> Kumulierte Autorenmarge als Rabatt verwenden</label>
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</div>
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<?php if ($discountError): ?><p class="notice error">Der Rabatt muss zwischen 0 und 100 Prozent liegen. Es wurde 85 Prozent verwendet.</p><?php endif; ?>
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<p class="muted">Hinterlegte Autorenmarge für dieses Buch: <?= number_format((float) ($selectedBook['author_margin_percent'] ?? 0), 2, ',', '.') ?> %</p>
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<div class="actions"><button type="submit">Preis berechnen</button></div>
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</form>
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</section>
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<?php if ($calculation !== null): ?>
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<section class="panel">
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<h2>Autorenpreis: <?= e($selectedBook['title']) ?></h2>
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<p class="muted">Berechnung pro Exemplar. Die Zwischenwerte werden ungerundet berechnet und erst für die Anzeige auf Cent gerundet.</p>
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<div class="table-wrap">
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<table class="billing-table">
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<tbody>
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<tr><th>Regulärer Brutto-Preis</th><td><?= authorPriceMoney($calculation['gross_price']) ?></td></tr>
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<tr><th>Regulärer Netto-Preis (Brutto ÷ 1,07)</th><td><?= authorPriceMoney($calculation['net_price']) ?></td></tr>
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<tr><th>Abzüglich Druckkosten</th><td><?= authorPriceMoney($calculation['printing_costs']) ?></td></tr>
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<tr><th>Erlös vor Autorenrabatt</th><td><?= authorPriceMoney($calculation['revenue_before_author_discount']) ?></td></tr>
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<tr><th>Autorenrabatt <?= number_format($calculation['discount_percent'], 2, ',', '.') ?> %<?= $calculation['use_author_margin'] ? ' (kumulierte Autorenmarge)' : '' ?></th><td><?= authorPriceMoney($calculation['author_discount']) ?></td></tr>
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<tr><th>Verbleibender Erlösanteil <?= number_format($calculation['retained_percent'], 2, ',', '.') ?> %</th><td><?= authorPriceMoney($calculation['retained_revenue']) ?></td></tr>
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<tr><th>Autorenpreis netto (Druckkosten + verbleibender Anteil)</th><td><?= authorPriceMoney($calculation['author_price_net']) ?></td></tr>
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<tr><th>Mehrwertsteuer 7 % auf Autorenpreis</th><td><?= authorPriceMoney($calculation['author_price_vat']) ?></td></tr>
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<tr><th>Autorenpreis brutto</th><td><strong><?= authorPriceMoney($calculation['author_price_gross']) ?></strong></td></tr>
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<tr><th>Ersparnis pro Exemplar</th><td><strong><?= authorPriceMoney($calculation['saving']) ?></strong></td></tr>
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</tbody>
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</table>
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</div>
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</section>
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<?php elseif ($selectedId !== null): ?>
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<section class="panel"><p class="notice error">Das ausgewählte Buch ist nicht als Printbuch vorhanden.</p></section>
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<?php endif; ?>
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</main>
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<script src="scripts/author_price.js"></script>
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</body>
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</html>
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