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

$msg = '';
$error = '';

$id = isset($_GET['id']) ? (int)$_GET['id'] : null;
$year_id = isset($_GET['year_id']) ? (int)$_GET['year_id'] : null;
$month = isset($_GET['month']) ? (int)$_GET['month'] : (int)date('n');
$save_and_new = false;

// Duplizieren
if (isset($_GET['duplicate'])) {
    $source_id = (int)$_GET['duplicate'];
    try {
        $new_id = duplicate_journal_entry($source_id);
        header('Location: ' . url_for('journal_entry.php?id=' . $new_id));
        exit;
    } catch (\Exception $e) {
        $error = 'Fehler beim Duplizieren: ' . $e->getMessage();
    }
}

$entry = null;
if ($id) {
    $entry = get_journal_entry($id);
    if ($entry) {
        $year_id = $entry['year_id'];
        $month = $entry['month'];
    }
}

// POST: Speichern
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $year_id = (int)$_POST['year_id'];
    $save_and_new = isset($_POST['save_and_new']);
    $id_post = !empty($_POST['id']) ? (int)$_POST['id'] : null;

    $data = [
        'year_id' => $year_id,
        'entry_date' => $_POST['entry_date'] ?? '',
        'description' => $_POST['description'] ?? '',
        'attachment_note' => $_POST['attachment_note'] ?? '',
        'amount' => $_POST['amount'] ?? 0,
        'supplier_id' => $_POST['supplier_id'] ?? null,
        'sort_order' => $_POST['sort_order'] ?? 0,
    ];

    if (!$data['entry_date'] || !$data['description']) {
        $error = 'Datum und Text sind Pflichtfelder.';
    } else {
        // Kontenverteilung aus POST parsen
        $accounts = [];
        $acct_types = $_POST['acct_type'] ?? [];
        $acct_sides = $_POST['acct_side'] ?? [];
        $acct_amounts = $_POST['acct_amount'] ?? [];
        $acct_rev_ids = $_POST['acct_rev_id'] ?? [];
        $acct_exp_ids = $_POST['acct_exp_id'] ?? [];
        $acct_notes = $_POST['acct_note'] ?? [];

        for ($i = 0; $i < count($acct_types); $i++) {
            if (empty($acct_types[$i]) || (float)($acct_amounts[$i] ?? 0) == 0) continue;
            $accounts[] = [
                'account_type' => $acct_types[$i],
                'side' => $acct_sides[$i] ?? 'soll',
                'amount' => (float)($acct_amounts[$i] ?? 0),
                'revenue_category_id' => !empty($acct_rev_ids[$i]) ? (int)$acct_rev_ids[$i] : null,
                'expense_category_id' => !empty($acct_exp_ids[$i]) ? (int)$acct_exp_ids[$i] : null,
                'note' => $acct_notes[$i] ?? '',
            ];
        }

        if (empty($accounts)) {
            $error = 'Mindestens eine Kontenbuchung ist erforderlich.';
        } else {
            try {
                $saved_id = save_journal_entry($id_post, $data, $accounts);
                if ($save_and_new) {
                    $month = (int)date('n', strtotime($data['entry_date']));
                    header('Location: ' . url_for('journal_entry.php?year_id=' . $year_id . '&month=' . $month . '&msg=gespeichert'));
                    exit;
                } else {
                    header('Location: ' . url_for('journal.php?year_id=' . $year_id . '&month=' . (int)date('n', strtotime($data['entry_date']))));
                    exit;
                }
            } catch (\Exception $e) {
                $error = 'Fehler beim Speichern: ' . $e->getMessage();
            }
        }
    }
}

if (isset($_GET['msg'])) {
    $msg = 'Buchung gespeichert.';
}

// Daten laden
$years = get_journal_years();
$account_options = get_journal_account_options();

// Wenn kein year_id, das erste offene Jahr nehmen
if (!$year_id && $years) {
    foreach ($years as $y) {
        if (!$y['is_closed']) {
            $year_id = $y['id'];
            break;
        }
    }
    if (!$year_id) $year_id = $years[0]['id'];
}

$current_year = null;
foreach ($years as $y) {
    if ($y['id'] == $year_id) {
        $current_year = $y;
        break;
    }
}

// Konto-Optionen als JSON für JavaScript
$acct_options_json = json_encode($account_options);
?>
<!doctype html>
<html lang="de">
<head>
    <meta charset="utf-8">
    <title>Buchung <?= $entry ? 'bearbeiten' : 'erstellen' ?></title>
    <link rel="stylesheet" href="assets/style.css">
    <script src="assets/combobox.js"></script>
    <script>
    const accountOptions = <?= $acct_options_json ?>;

    function addAccountRow(type, side, amount, revId, expId, note) {
        type = type || '';
        side = side || 'soll';
        amount = amount || '';
        revId = revId || '';
        expId = expId || '';
        note = note || '';

        const tbody = document.getElementById('accounts-body');
        const tr = document.createElement('tr');
        tr.innerHTML =
            '<td><div class="pirp-combobox-wrap"></div>' +
            '<input type="hidden" name="acct_type[]" class="acct-type-hidden" value="' + type + '">' +
            '<input type="hidden" name="acct_side[]" class="acct-side-hidden" value="' + side + '">' +
            '<input type="hidden" name="acct_rev_id[]" class="acct-rev-hidden" value="' + revId + '">' +
            '<input type="hidden" name="acct_exp_id[]" class="acct-exp-hidden" value="' + expId + '">' +
            '</td>' +
            '<td class="acct-side-display">' + (side === 'haben' ? 'H' : (type ? 'S' : '')) + '</td>' +
            '<td><input type="number" step="0.01" name="acct_amount[]" value="' + amount + '" style="max-width:120px;"></td>' +
            '<td><input type="text" name="acct_note[]" value="' + note + '" style="max-width:150px;"></td>' +
            '<td><button type="button" class="danger" style="padding:2px 8px;font-size:10px;" onclick="this.closest(\'tr\').remove();">X</button></td>';
        tbody.appendChild(tr);

        const wrap = tr.querySelector('.pirp-combobox-wrap');
        const selectedValue = type ? (type + '|' + side + '|' + revId + '|' + expId) : '';
        new PirpCombobox(wrap, accountOptions, {
            placeholder: '-- Konto wählen --',
            selectedValue: selectedValue,
            onSelect: function(opt) {
                tr.querySelector('.acct-type-hidden').value = opt.value;
                tr.querySelector('.acct-side-hidden').value = opt.side;
                tr.querySelector('.acct-rev-hidden').value = opt.rev_id;
                tr.querySelector('.acct-exp-hidden').value = opt.exp_id;
                tr.querySelector('.acct-side-display').textContent = opt.side === 'soll' ? 'S' : 'H';
            }
        });
    }

    document.addEventListener('DOMContentLoaded', function() {
        const form = document.querySelector('form');
        form.addEventListener('keydown', function(e) {
            if (e.key === 'Enter' && e.target.tagName !== 'TEXTAREA' && e.target.type !== 'submit') {
                e.preventDefault();
                const inputs = Array.from(form.querySelectorAll('input:not([type="hidden"]), select, textarea, button[type="submit"]'));
                const currentIndex = inputs.indexOf(e.target);
                if (currentIndex > -1 && currentIndex < inputs.length - 1) {
                    inputs[currentIndex + 1].focus();
                }
            }
        });
    });
    </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') ?>"><?= icon_expenses() ?>Ausgaben</a>
        <a href="<?= url_for('belegarchiv.php') ?>"><?= icon_archive() ?>Belege</a>
        <a href="<?= url_for('journal.php') ?>" class="active"><?= 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="journal-subnav">
        <a href="<?= url_for('journal.php') ?>">Monatsansicht</a>
        <a href="<?= url_for('journal_summary.php') ?>">Jahressummen</a>
        <a href="<?= url_for('journal_search.php') ?>">Suche</a>
    </div>

    <?php if ($msg): ?><p class="success"><?= htmlspecialchars($msg) ?></p><?php endif; ?>
    <?php if ($error): ?><p class="error"><?= htmlspecialchars($error) ?></p><?php endif; ?>

    <?php if (empty($years)): ?>
        <p class="warning">Bitte zuerst ein <a href="<?= url_for('settings.php?tab=journal') ?>">Jahr anlegen</a>.</p>
    <?php else: ?>
    <section>
        <h2><?= $entry ? 'Buchung bearbeiten' : 'Neue Buchung' ?></h2>
        <?php if ($entry && !empty($entry['source_type']) && $entry['source_type'] !== 'manual'): ?>
            <p style="font-size:10px;color:var(--accent);margin-bottom:4px;">
                <?php if ($entry['source_type'] === 'invoice_payment' && !empty($entry['invoice_id'])): ?>
                    Automatisch erstellt aus Rechnungszahlung:
                    <a href="<?= url_for('invoice_pdf.php?id=' . $entry['invoice_id']) ?>" target="_blank">Rechnung PDF</a>
                <?php elseif ($entry['source_type'] === 'expense_payment' && !empty($entry['expense_id'])): ?>
                    Automatisch erstellt aus Ausgabe:
                    <a href="<?= url_for('expenses.php?action=edit&id=' . $entry['expense_id']) ?>">Ausgabe bearbeiten</a>
                <?php endif; ?>
            </p>
        <?php endif; ?>
        <form method="post">
            <input type="hidden" name="id" value="<?= htmlspecialchars($entry['id'] ?? '') ?>">

            <div class="flex-row">
                <label>Jahr:
                    <select name="year_id" required>
                        <?php foreach ($years as $y): ?>
                            <option value="<?= $y['id'] ?>" <?= $y['id'] == $year_id ? 'selected' : '' ?> <?= $y['is_closed'] ? 'disabled' : '' ?>>
                                <?= (int)$y['year'] ?><?= $y['is_closed'] ? ' (geschlossen)' : '' ?>
                            </option>
                        <?php endforeach; ?>
                    </select>
                </label>
                <label>Datum:
                    <input type="date" name="entry_date" value="<?= htmlspecialchars($entry['entry_date'] ?? date('Y-m-d')) ?>" required>
                </label>
            </div>
            <label>Text:
                <input type="text" name="description" value="<?= htmlspecialchars($entry['description'] ?? '') ?>" required style="max-width:600px;">
            </label>
            <label>Beleg:
                <input type="text" name="attachment_note" value="<?= htmlspecialchars($entry['attachment_note'] ?? '') ?>" style="max-width:200px;">
            </label>
            <div class="flex-row">
                <label>Betrag:
                    <input type="number" step="0.01" name="amount" value="<?= htmlspecialchars($entry['amount'] ?? '0.00') ?>" required style="max-width:150px;">
                </label>
                <label>Sortierung:
                    <input type="number" name="sort_order" value="<?= htmlspecialchars($entry['sort_order'] ?? '0') ?>" style="max-width:80px;">
                </label>
            </div>

            <h2>Kontenverteilung</h2>
            <table class="list">
                <thead>
                <tr>
                    <th>Konto</th>
                    <th>S/H</th>
                    <th>Betrag</th>
                    <th>Notiz</th>
                    <th></th>
                </tr>
                </thead>
                <tbody id="accounts-body">
                </tbody>
            </table>
            <button type="button" onclick="addAccountRow();" style="margin-top:8px;">+ Zeile hinzufügen</button>

            <div style="margin-top:16px;">
                <button type="submit">Speichern</button>
                <button type="submit" name="save_and_new" value="1" class="secondary">Speichern &amp; Neu</button>
                <a href="<?= url_for('journal.php?year_id=' . $year_id . '&month=' . $month) ?>" class="button-secondary">Abbrechen</a>
            </div>
        </form>
    </section>

    <script>
    // Bestehende Konten laden oder leere Zeilen
    <?php if ($entry && !empty($entry['accounts'])): ?>
        <?php foreach ($entry['accounts'] as $acct): ?>
        addAccountRow(
            <?= json_encode($acct['account_type']) ?>,
            <?= json_encode($acct['side']) ?>,
            <?= json_encode($acct['amount']) ?>,
            <?= json_encode($acct['revenue_category_id'] ?? '') ?>,
            <?= json_encode($acct['expense_category_id'] ?? '') ?>,
            <?= json_encode($acct['note'] ?? '') ?>
        );
        <?php endforeach; ?>
    <?php else: ?>
        addAccountRow();
        addAccountRow();
    <?php endif; ?>
    </script>
    <?php endif; ?>
</main>
<script src="assets/command-palette.js"></script>
</body>
</html>