<?php
require_once __DIR__ . '/../src/config.php';
require_once __DIR__ . '/../src/auth.php';
require_once __DIR__ . '/../src/db.php';
require_once __DIR__ . '/../src/invoice_functions.php';
require_once __DIR__ . '/../src/journal_functions.php';
require_once __DIR__ . '/../src/icons.php';
require_login();

$pdo = get_db();

$msg = '';

// Rechnung als bezahlt markieren + automatische Journalbuchung
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['mark_paid_id'])) {
    $id = (int)$_POST['mark_paid_id'];
    $payment_date = $_POST['payment_date'] ?? date('Y-m-d');

    $pdo->beginTransaction();
    try {
        // Bezahlt-Status und Zahlungsdatum setzen
        $stmt = $pdo->prepare('UPDATE invoices SET paid = TRUE, payment_date = :pd WHERE id = :id');
        $stmt->execute([':id' => $id, ':pd' => $payment_date]);

        // Automatisch Journalbuchung erstellen
        $existing = get_journal_entry_for_invoice($id);
        if (!$existing) {
            $entry_id = create_journal_entry_from_invoice($id);
            $msg = 'Rechnung als bezahlt markiert. Journalbuchung #' . $entry_id . ' erstellt.';
        } else {
            $msg = 'Rechnung als bezahlt markiert (Journalbuchung existierte bereits).';
        }

        $pdo->commit();
    } catch (Exception $e) {
        $pdo->rollBack();
        $msg = 'Fehler: ' . $e->getMessage();
    }

    header('Location: ' . url_for('invoices.php?msg=' . urlencode($msg)));
    exit;
}

// Nachricht aus Redirect anzeigen
if (isset($_GET['msg'])) {
    $msg = $_GET['msg'];
}

$filter_number = trim($_GET['number'] ?? '');
$filter_customer = trim($_GET['customer'] ?? '');
$filter_from = trim($_GET['from'] ?? '');
$filter_to = trim($_GET['to'] ?? '');

$where = "WHERE 1=1";
$params = [];

if ($filter_number !== '') {
    $where .= " AND i.invoice_number ILIKE :num";
    $params[':num'] = '%' . $filter_number . '%';
}
if ($filter_customer !== '') {
    $where .= " AND c.name ILIKE :cust";
    $params[':cust'] = '%' . $filter_customer . '%';
}
if ($filter_from !== '') {
    $where .= " AND i.invoice_date >= :from";
    $params[':from'] = $filter_from;
}
if ($filter_to !== '') {
    $where .= " AND i.invoice_date <= :to";
    $params[':to'] = $filter_to;
}

try {
    $sql = "SELECT i.*, c.name AS customer_name, c.customer_number,
                   COALESCE(i.is_storno, FALSE) AS is_storno,
                   i.storno_of,
                   storno_child.invoice_number AS storno_child_number,
                   storno_child.id AS storno_child_id
            FROM invoices i
            JOIN customers c ON c.id = i.customer_id
            LEFT JOIN invoices storno_child ON storno_child.storno_of = i.id
            $where ORDER BY i.invoice_date DESC, i.id DESC";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
} catch (\PDOException $e) {
    // is_storno/storno_of noch nicht migriert — Fallback
    $sql = "SELECT i.*, c.name AS customer_name, c.customer_number,
                   FALSE AS is_storno, NULL AS storno_of,
                   NULL AS storno_child_number, NULL AS storno_child_id
            FROM invoices i
            JOIN customers c ON c.id = i.customer_id
            $where ORDER BY i.invoice_date DESC, i.id DESC";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
}
$invoices = $stmt->fetchAll(PDO::FETCH_ASSOC);

// Verknüpfte Journal-Einträge laden (nur wenn Spalte existiert)
$journal_linked = [];
try {
    $stmt_jl = $pdo->query("SELECT invoice_id, id FROM journal_entries WHERE invoice_id IS NOT NULL");
    foreach ($stmt_jl->fetchAll(PDO::FETCH_ASSOC) as $jl) {
        $journal_linked[(int)$jl['invoice_id']] = (int)$jl['id'];
    }
} catch (PDOException $e) {
    // Spalte invoice_id existiert noch nicht - ignorieren
}

// Mahnungen pro Rechnung laden
$mahnungen_count = [];
try {
    $stmt_m = $pdo->query("SELECT invoice_id, COUNT(*) AS cnt, MAX(level) AS max_level FROM mahnungen GROUP BY invoice_id");
    foreach ($stmt_m->fetchAll(PDO::FETCH_ASSOC) as $m) {
        $mahnungen_count[(int)$m['invoice_id']] = ['cnt' => $m['cnt'], 'level' => $m['max_level']];
    }
} catch (PDOException $e) {
    // Tabelle noch nicht migriert
}
?>
<!doctype html>
<html lang="de">
<head>
    <meta charset="utf-8">
    <title>Rechnungen</title>
    <link rel="stylesheet" href="assets/style.css">
</head>
<body>
<header>
    <h1>PIRP</h1>
    <nav>
        <a href="<?= url_for('index.php') ?>"><?= icon_dashboard() ?>Dashboard</a>
        <a href="<?= url_for('invoices.php') ?>" class="active"><?= icon_invoices() ?>Rechnungen</a>
        <a href="<?= url_for('customers.php') ?>"><?= icon_customers() ?>Kunden</a>
        <a href="<?= url_for('expenses.php') ?>"><?= icon_expenses() ?>Ausgaben</a>
        <a href="<?= url_for('belegarchiv.php') ?>"><?= icon_archive() ?>Belege</a>
        <a href="<?= url_for('journal.php') ?>"><?= icon_journal() ?>Journal</a>
        <a href="<?= url_for('euer.php') ?>"><?= icon_euer() ?>EÜR</a>
        <a href="<?= url_for('settings.php') ?>"><?= icon_settings() ?>Einstellungen</a>
        <a href="<?= url_for('logout.php') ?>"><?= icon_logout() ?>Logout (<?= htmlspecialchars($_SESSION['username'] ?? '') ?>)</a>
        <span class="cmd-k-hint" onclick="document.dispatchEvent(new KeyboardEvent('keydown',{key:'k',ctrlKey:true}))"><kbd>Ctrl+K</kbd></span>
    </nav>
</header>
<main>
    <div class="module-subnav">
        <a href="<?= url_for('invoices.php') ?>" class="active">Übersicht</a>
        <a href="<?= url_for('invoice_new.php') ?>">Neue Rechnung</a>
        <a href="<?= url_for('recurring.php') ?>">Abo-Rechnungen</a>
            </div>
    <?php if ($msg): ?><p class="success"><?= htmlspecialchars($msg) ?></p><?php endif; ?>

    <form method="get" class="filters">
        <label>Rechnungsnummer:
            <input type="text" name="number" value="<?= htmlspecialchars($filter_number) ?>">
        </label>
        <label>Kunde:
            <input type="text" name="customer" value="<?= htmlspecialchars($filter_customer) ?>">
        </label>
        <label>Von:
            <input type="date" name="from" value="<?= htmlspecialchars($filter_from) ?>">
        </label>
        <label>Bis:
            <input type="date" name="to" value="<?= htmlspecialchars($filter_to) ?>">
        </label>
        <button type="submit">Filtern</button>
        <a href="<?= url_for('invoices.php') ?>">Zurücksetzen</a>
        <a href="<?= url_for('invoices_csv.php') . '?number=' . urlencode($filter_number) . '&customer=' . urlencode($filter_customer) . '&from=' . urlencode($filter_from) . '&to=' . urlencode($filter_to) ?>" class="button-secondary">Export CSV</a>
    </form>

    <table class="list">
        <thead>
        <tr>
            <th>Datum</th>
            <th>Nr.</th>
            <th>Kunde</th>
            <th>Betrag (brutto)</th>
            <th>Status</th>
            <th>Aktion</th>
        </tr>
        </thead>
        <tbody>
        <?php foreach ($invoices as $inv): ?>
            <?php
                $is_storno = !empty($inv['is_storno']);
                $has_storno_child = !empty($inv['storno_child_id']);
                $mahnung_info = $mahnungen_count[(int)$inv['id']] ?? null;
            ?>
            <tr <?= $is_storno ? 'style="opacity:0.6;"' : '' ?>>
                <td><?= htmlspecialchars(date('d.m.Y', strtotime($inv['invoice_date']))) ?></td>
                <td>
                    <?= htmlspecialchars($inv['invoice_number']) ?>
                    <?php if ($is_storno): ?>
                        <span style="font-size:9px;color:var(--error);font-weight:600;margin-left:4px;">STORNO</span>
                    <?php endif; ?>
                    <?php if ($has_storno_child): ?>
                        <span style="font-size:9px;color:var(--text-muted);margin-left:4px;" title="Storniert durch <?= htmlspecialchars($inv['storno_child_number']) ?>">storniert</span>
                    <?php endif; ?>
                </td>
                <td><?= htmlspecialchars($inv['customer_name']) ?></td>
                <td style="text-align:right;"><?= number_format($inv['total_gross'], 2, ',', '.') ?> €</td>
                <td>
                    <?= $inv['paid'] ? 'bezahlt' : 'offen' ?>
                    <?php if ($mahnung_info): ?>
                        <a href="<?= url_for('belegarchiv.php?invoice_id=' . $inv['id'] . '&type=mahnung') ?>"
                           style="font-size:9px;color:var(--warning);margin-left:4px;font-weight:600;">
                            M<?= $mahnung_info['level'] ?>
                        </a>
                    <?php endif; ?>
                </td>
                <td>
                    <a href="<?= url_for('invoice_pdf.php?id=' . $inv['id']) ?>" target="_blank">PDF</a>
                    <?php if (!$inv['paid']): ?>
                        | <a href="#" onclick="document.getElementById('pay-form-<?= $inv['id'] ?>').style.display='block'; return false;">bezahlt</a>
                        | <a href="<?= url_for('mahnung_new.php?invoice_id=' . $inv['id']) ?>">Mahnung</a>
                    <?php endif; ?>
                    <?php if ($inv['paid'] && isset($journal_linked[$inv['id']])): ?>
                        | <a href="<?= url_for('journal_entry.php?id=' . $journal_linked[$inv['id']]) ?>">Journal</a>
                    <?php endif; ?>
                    <?php if (!$is_storno && !$has_storno_child): ?>
                        | <a href="<?= url_for('invoice_storno.php?id=' . $inv['id']) ?>" style="color:var(--error);">Storno</a>
                    <?php endif; ?>
                </td>
            </tr>
            <?php if (!$inv['paid']): ?>
            <tr id="pay-form-<?= $inv['id'] ?>" style="display:none;" class="payment-form-row">
                <td colspan="6">
                    <form method="post" style="display:inline-flex; gap:8px; align-items:center; padding:4px 0;">
                        <input type="hidden" name="mark_paid_id" value="<?= $inv['id'] ?>">
                        <label style="margin:0;">Zahlungsdatum:
                            <input type="date" name="payment_date" value="<?= date('Y-m-d') ?>" required>
                        </label>
                        <button type="submit" onclick="return confirm('Rechnung als bezahlt markieren und Journalbuchung erstellen?');">Bezahlt + Journal buchen</button>
                        <a href="#" onclick="this.closest('tr').style.display='none'; return false;">Abbrechen</a>
                    </form>
                </td>
            </tr>
            <?php endif; ?>
            </tr>
        <?php endforeach; ?>
        <?php if (empty($invoices)): ?>
            <tr><td colspan="6">Keine Rechnungen gefunden.</td></tr>
        <?php endif; ?>
        </tbody>
    </table>
</main>
<script src="assets/command-palette.js"></script>
</body>
</html>