<?php
require_once __DIR__ . '/../src/config.php';
require_once __DIR__ . '/../src/auth.php';
require_once __DIR__ . '/../src/db.php';
require_once __DIR__ . '/../src/expense_functions.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();
$settings = get_settings();
$vat_mode = $settings['vat_mode'] ?? 'klein';
$msg = '';
$error = '';

$action = $_GET['action'] ?? '';
$id = isset($_GET['id']) ? (int)$_GET['id'] : null;

// Aufwandskategorien für Dropdown laden
$expense_categories = get_journal_expense_categories(true);

// Ausgabe als bezahlt markieren (eigene Aktion)
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['mark_paid_id'])) {
    $pay_id = (int)$_POST['mark_paid_id'];
    $payment_date = $_POST['payment_date'] ?? date('Y-m-d');

    $pdo->beginTransaction();
    try {
        $stmt = $pdo->prepare('UPDATE expenses SET paid = TRUE, payment_date = :pd WHERE id = :id');
        $stmt->execute([':id' => $pay_id, ':pd' => $payment_date]);

        // Journal-Eintrag erstellen
        $existing = get_journal_entry_for_expense($pay_id);
        if (!$existing) {
            $entry_id = create_journal_entry_from_expense($pay_id);
            $msg = 'Ausgabe als bezahlt markiert. Journalbuchung #' . $entry_id . ' erstellt.';
        } else {
            $msg = 'Ausgabe als bezahlt markiert (Journalbuchung existierte bereits).';
        }

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

// Normale Ausgabe speichern (neu oder Update)
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['expense_date']) && !isset($_POST['mark_paid_id'])) {
    $idPost = isset($_POST['id']) && $_POST['id'] !== '' ? (int)$_POST['id'] : null;
    $data = [
        'expense_date'        => $_POST['expense_date'] ?? '',
        'description'         => $_POST['description'] ?? '',
        'category'            => $_POST['category'] ?? '',
        'amount'              => (float)($_POST['amount'] ?? 0),
        'vat_rate'            => (float)($_POST['vat_rate'] ?? 0),
        'expense_category_id' => !empty($_POST['expense_category_id']) ? (int)$_POST['expense_category_id'] : null,
        'paid'                => !empty($_POST['paid']) ? 1 : 0,
        'payment_date'        => $_POST['payment_date'] ?? '',
    ];

    if (!$data['expense_date'] || !$data['description'] || $data['amount'] <= 0) {
        $error = 'Datum, Beschreibung und Betrag sind Pflichtfelder.';
    } elseif (!empty($data['paid']) && empty($data['expense_category_id'])) {
        $error = 'Bei bezahlten Ausgaben ist eine Aufwandskategorie für die Journalbuchung Pflicht.';
    } else {
        $pdo->beginTransaction();
        try {
            // War vorher schon bezahlt? (für Update-Check)
            $was_paid = false;
            $had_journal = false;
            if ($idPost) {
                $old_exp = get_expense($idPost);
                $was_paid = $old_exp && $old_exp['paid'];
                $had_journal = $old_exp ? (bool)get_journal_entry_for_expense($idPost) : false;
            }

            // Ausgabe speichern
            $expense_id = save_expense($idPost, $data);

            // Datei-Upload (PDF) verarbeiten
            if (!empty($_FILES['attachment']['tmp_name'])) {
                $finfo = finfo_open(FILEINFO_MIME_TYPE);
                $mime  = finfo_file($finfo, $_FILES['attachment']['tmp_name']);
                finfo_close($finfo);

                if ($mime === 'application/pdf') {
                    $uploadDir = __DIR__ . '/uploads/expenses';
                    if (!is_dir($uploadDir)) {
                        mkdir($uploadDir, 0775, true);
                    }
                    $targetFile = $uploadDir . '/expense_' . $expense_id . '.pdf';
                    if (move_uploaded_file($_FILES['attachment']['tmp_name'], $targetFile)) {
                        $relPath = 'uploads/expenses/expense_' . $expense_id . '.pdf';
                        $stmt = $pdo->prepare("UPDATE expenses SET attachment_path = :p WHERE id = :id");
                        $stmt->execute([':p' => $relPath, ':id' => $expense_id]);
                    } else {
                        $error = 'Ausgabe gespeichert, aber Datei konnte nicht verschoben werden.';
                    }
                } else {
                    $error = 'Bitte nur PDF-Dateien als Beleg hochladen.';
                }
            }

            // Journal-Integration
            if (!empty($data['paid']) && !$had_journal) {
                // Neu bezahlt → Journal-Eintrag erstellen
                $existing = get_journal_entry_for_expense($expense_id);
                if (!$existing) {
                    $entry_id = create_journal_entry_from_expense($expense_id);
                    $msg = 'Ausgabe gespeichert. Journalbuchung #' . $entry_id . ' erstellt.';
                } else {
                    $msg = 'Ausgabe gespeichert.';
                }
            } elseif (empty($data['paid']) && $had_journal) {
                // War bezahlt, jetzt offen → Journal-Eintrag entfernen
                delete_journal_entry_for_expense($expense_id);
                $msg = 'Ausgabe gespeichert. Journalbuchung entfernt (Status: offen).';
            } else {
                $msg = $msg ?: 'Ausgabe gespeichert.';
            }

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

if ($action === 'delete' && $id) {
    $exp = get_expense($id);
    if ($exp) {
        // Verknüpften Journal-Eintrag löschen
        delete_journal_entry_for_expense($id);

        if (!empty($exp['attachment_path'])) {
            $fsPath = __DIR__ . '/' . $exp['attachment_path'];
            if (is_file($fsPath)) {
                @unlink($fsPath);
            }
        }
        delete_expense($id);
        $msg = 'Ausgabe und zugehörige Journalbuchung gelöscht.';
    }
    $action = '';
    $id = null;
}

$editExpense = null;
if ($action === 'edit' && $id) {
    $editExpense = get_expense($id);
}

$filters = [
    'from'   => $_GET['from'] ?? '',
    'to'     => $_GET['to'] ?? '',
    'paid'   => $_GET['paid'] ?? '',
    'search' => $_GET['search'] ?? '',
];

$expenses = get_expenses($filters);

// Journal-Verknüpfungen laden
$journal_linked_expenses = [];
try {
    $stmt_jl = $pdo->query("SELECT expense_id, id FROM journal_entries WHERE expense_id IS NOT NULL");
    foreach ($stmt_jl->fetchAll(PDO::FETCH_ASSOC) as $jl) {
        $journal_linked_expenses[(int)$jl['expense_id']] = (int)$jl['id'];
    }
} catch (PDOException $e) {
    // Spalte existiert noch nicht
}
?>
<!doctype html>
<html lang="de">
<head>
    <meta charset="utf-8">
    <title>Ausgaben</title>
    <link rel="stylesheet" href="assets/style.css">
    <script>
        function updateVatCalc() {
            const amount = parseFloat(document.getElementById('expense-amount').value) || 0;
            const vatRate = parseFloat(document.getElementById('expense-vat-rate').value) || 0;
            const infoEl = document.getElementById('vat-info');
            if (vatRate > 0 && amount > 0) {
                const net = amount / (1 + vatRate / 100);
                const vat = amount - net;
                infoEl.textContent = 'Netto: ' + net.toFixed(2).replace('.', ',') + ' € | VorSt: ' + vat.toFixed(2).replace('.', ',') + ' €';
                infoEl.style.display = 'block';
            } else {
                infoEl.style.display = 'none';
            }
        }
    </script>
</head>
<body>
<header>
    <h1>PIRP</h1>
    <nav>
        <a href="<?= url_for('index.php') ?>"><?= icon_dashboard() ?>Dashboard</a>
        <a href="<?= url_for('invoices.php') ?>"><?= icon_invoices() ?>Rechnungen</a>
        <a href="<?= url_for('customers.php') ?>"><?= icon_customers() ?>Kunden</a>
        <a href="<?= url_for('expenses.php') ?>" class="active"><?= icon_expenses() ?>Ausgaben</a>
        <a href="<?= url_for('belegarchiv.php') ?>"><?= icon_archive() ?>Belege</a>
        <a href="<?= url_for('journal.php') ?>"><?= icon_journal() ?>Journal</a>
        <a href="<?= url_for('euer.php') ?>"><?= icon_euer() ?>EÜR</a>
        <a href="<?= url_for('settings.php') ?>"><?= icon_settings() ?>Einstellungen</a>
        <a href="<?= url_for('logout.php') ?>"><?= icon_logout() ?>Logout (<?= htmlspecialchars($_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>
    <?php if ($msg): ?><p class="success"><?= htmlspecialchars($msg) ?></p><?php endif; ?>
    <?php if ($error): ?><p class="error"><?= htmlspecialchars($error) ?></p><?php endif; ?>

    <section>
        <h2><?= $editExpense ? 'Ausgabe bearbeiten' : 'Neue Ausgabe' ?></h2>
        <form method="post" enctype="multipart/form-data">
            <input type="hidden" name="id" value="<?= htmlspecialchars($editExpense['id'] ?? '') ?>">
            <div class="flex-row">
                <label>Datum:
                    <input type="date" name="expense_date" value="<?= htmlspecialchars($editExpense['expense_date'] ?? date('Y-m-d')) ?>" required>
                </label>
                <label>Betrag (brutto):
                    <input type="number" step="0.01" name="amount" id="expense-amount"
                           value="<?= htmlspecialchars($editExpense['amount'] ?? '0.00') ?>"
                           required oninput="updateVatCalc()">
                </label>
                <?php if ($vat_mode === 'normal'): ?>
                <label>MwSt-Satz:
                    <select name="vat_rate" id="expense-vat-rate" onchange="updateVatCalc()">
                        <option value="0" <?= (isset($editExpense['vat_rate']) && (float)$editExpense['vat_rate'] == 0) ? 'selected' : '' ?>>0% (keine MwSt)</option>
                        <option value="7" <?= (isset($editExpense['vat_rate']) && (float)$editExpense['vat_rate'] == 7) ? 'selected' : '' ?>>7%</option>
                        <option value="19" <?= (isset($editExpense['vat_rate']) && (float)$editExpense['vat_rate'] == 19) ? 'selected' : (!isset($editExpense) ? 'selected' : '') ?>>19%</option>
                    </select>
                </label>
                <?php else: ?>
                <input type="hidden" name="vat_rate" value="0">
                <?php endif; ?>
            </div>
            <div id="vat-info" style="display:none; font-size:11px; color:var(--text-dim); margin:-8px 0 8px;"></div>

            <label>Beschreibung:
                <input type="text" name="description" value="<?= htmlspecialchars($editExpense['description'] ?? '') ?>" required>
            </label>

            <div class="flex-row">
                <label>Aufwandskategorie:
                    <select name="expense_category_id">
                        <option value="">-- keine --</option>
                        <?php foreach ($expense_categories as $cat): ?>
                            <option value="<?= $cat['id'] ?>" <?= (isset($editExpense['expense_category_id']) && (int)$editExpense['expense_category_id'] === (int)$cat['id']) ? 'selected' : '' ?>>
                                <?= htmlspecialchars($cat['name']) ?>
                            </option>
                        <?php endforeach; ?>
                    </select>
                </label>
                <label>Notiz / Kategorie:
                    <input type="text" name="category" value="<?= htmlspecialchars($editExpense['category'] ?? '') ?>" placeholder="Freitext-Notiz">
                </label>
            </div>

            <div class="flex-row">
                <label>
                    <input type="checkbox" name="paid" value="1" <?= (isset($editExpense['paid']) ? $editExpense['paid'] : 1) ? 'checked' : '' ?>>
                    bezahlt
                </label>
                <label>Zahlungsdatum:
                    <input type="date" name="payment_date" value="<?= htmlspecialchars($editExpense['payment_date'] ?? date('Y-m-d')) ?>">
                </label>
            </div>

            <label>Beleg (PDF):
                <input type="file" name="attachment" accept="application/pdf">
                <?php if (!empty($editExpense['attachment_path'])): ?>
                    <br>Aktueller Beleg:
                    <a href="<?= url_for('expense_file.php?id=' . $editExpense['id']) ?>" target="_blank">PDF öffnen</a>
                <?php endif; ?>
            </label>

            <button type="submit">Speichern</button>
            <?php if ($editExpense): ?>
                <a href="<?= url_for('expenses.php') ?>">Abbrechen</a>
            <?php endif; ?>
        </form>
    </section>

    <section>
        <h2>Übersicht Ausgaben</h2>
        <form method="get" class="filters">
            <label>Von:
                <input type="date" name="from" value="<?= htmlspecialchars($filters['from']) ?>">
            </label>
            <label>Bis:
                <input type="date" name="to" value="<?= htmlspecialchars($filters['to']) ?>">
            </label>
            <label>Status:
                <select name="paid">
                    <option value="">alle</option>
                    <option value="1" <?= $filters['paid']==='1' ? 'selected' : '' ?>>bezahlt</option>
                    <option value="0" <?= $filters['paid']==='0' ? 'selected' : '' ?>>offen</option>
                </select>
            </label>
            <label>Suche:
                <input type="text" name="search" value="<?= htmlspecialchars($filters['search']) ?>">
            </label>
            <button type="submit">Filtern</button>
            <a href="<?= url_for('expenses.php') ?>">Zurücksetzen</a>
        </form>

        <table class="list">
            <thead>
            <tr>
                <th>Datum</th>
                <th>Beschreibung</th>
                <th>Kategorie</th>
                <th>Betrag</th>
                <th>Status</th>
                <th>Beleg</th>
                <th>Aktion</th>
            </tr>
            </thead>
            <tbody>
            <?php $total = 0.0; ?>
            <?php foreach ($expenses as $e): ?>
                <?php $total += $e['amount']; ?>
                <tr>
                    <td><?= htmlspecialchars(date('d.m.Y', strtotime($e['expense_date']))) ?></td>
                    <td><?= htmlspecialchars($e['description']) ?></td>
                    <td><?= htmlspecialchars($e['category']) ?></td>
                    <td style="text-align:right;"><?= number_format($e['amount'], 2, ',', '.') ?> €</td>
                    <td><?= $e['paid'] ? 'bezahlt' : 'offen' ?></td>
                    <td>
                        <?php if (!empty($e['attachment_path'])): ?>
                            <a href="<?= url_for('expense_file.php?id=' . $e['id']) ?>" target="_blank">PDF</a>
                        <?php else: ?>
                            -
                        <?php endif; ?>
                    </td>
                    <td>
                        <a href="<?= url_for('expenses.php?action=edit&id=' . $e['id']) ?>">Bearbeiten</a>
                        | <a href="<?= url_for('expenses.php?action=delete&id=' . $e['id']) ?>" onclick="return confirm('Ausgabe wirklich löschen?');">Löschen</a>
                        <?php if (!$e['paid']): ?>
                            | <a href="#" onclick="document.getElementById('pay-exp-<?= $e['id'] ?>').style.display='table-row'; return false;">als bezahlt</a>
                        <?php endif; ?>
                        <?php if (isset($journal_linked_expenses[$e['id']])): ?>
                            | <a href="<?= url_for('journal_entry.php?id=' . $journal_linked_expenses[$e['id']]) ?>">Journal</a>
                        <?php endif; ?>
                    </td>
                </tr>
                <?php if (!$e['paid']): ?>
                <tr id="pay-exp-<?= $e['id'] ?>" style="display:none;" class="payment-form-row">
                    <td colspan="7">
                        <form method="post" style="display:inline-flex; gap:8px; align-items:center; padding:4px 0;">
                            <input type="hidden" name="mark_paid_id" value="<?= $e['id'] ?>">
                            <label style="margin:0;">Zahlungsdatum:
                                <input type="date" name="payment_date" value="<?= date('Y-m-d') ?>" required>
                            </label>
                            <button type="submit" onclick="return confirm('Ausgabe als bezahlt markieren und Journal buchen?');">Bezahlt + Journal buchen</button>
                            <a href="#" onclick="this.closest('tr').style.display='none'; return false;">Abbrechen</a>
                        </form>
                    </td>
                </tr>
                <?php endif; ?>
            <?php endforeach; ?>
            <?php if (empty($expenses)): ?>
                <tr><td colspan="7">Keine Ausgaben gefunden.</td></tr>
            <?php else: ?>
                <tr>
                    <td colspan="3"><strong>Summe</strong></td>
                    <td style="text-align:right;"><strong><?= number_format($total, 2, ',', '.') ?> €</strong></td>
                    <td colspan="3"></td>
                </tr>
            <?php endif; ?>
            </tbody>
        </table>
    </section>
</main>
<script>
    // MwSt-Info beim Laden aktualisieren (bei Edit)
    document.addEventListener('DOMContentLoaded', updateVatCalc);
</script>
<script src="assets/command-palette.js"></script>
</body>
</html>