<?php
$pageTitle = 'Carga de Historial';
require_once __DIR__ . '/../includes/db.php';
require_once __DIR__ . '/includes/admin-header.php';

$db = getDB();

// Label maps
$tipoLabels = [
    'visa'               => 'Visa',
    'sentri'             => 'Sentri/Global',
    'pasaporte'          => 'Pasaporte',
    'adelanto_cita'      => 'Adelanto Cita',
    'doble_nacionalidad' => 'Doble Nacionalidad',
];
$estadoLabels = [
    'nuevo'       => 'Nuevo',
    'en_proceso'  => 'En Proceso',
    'en_revision' => 'En Revisi&oacute;n',
    'completado'  => 'Completado',
    'cancelado'   => 'Cancelado',
];

$errors  = [];
$success = '';

// ── Track recently added client IDs in session ──────────────────
if (!isset($_SESSION['carga_historial_ids'])) {
    $_SESSION['carga_historial_ids'] = [];
}

// ── Handle POST ─────────────────────────────────────────────────
if ($_SERVER['REQUEST_METHOD'] === 'POST' && csrfValidate()) {

    $nombre    = trim($_POST['nombre'] ?? '');
    $telefono  = trim($_POST['telefono'] ?? '');
    $email     = trim($_POST['email'] ?? '');
    $direccion = trim($_POST['direccion'] ?? '');
    $notas     = trim($_POST['notas'] ?? '');

    // Validate
    if ($nombre === '') {
        $errors[] = 'El nombre es obligatorio.';
    }
    if ($email !== '' && !filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $errors[] = 'El email no es v&aacute;lido.';
    }

    // Tramite fields (only used if checkbox is on)
    $agregarTramite = isset($_POST['agregar_tramite']);
    $tramTipo            = trim($_POST['tram_tipo'] ?? '');
    $tramEstado          = trim($_POST['tram_estado'] ?? 'nuevo');
    $tramFechaSolicitud  = trim($_POST['tram_fecha_solicitud'] ?? '');
    $tramFechaCita       = trim($_POST['tram_fecha_cita'] ?? '');
    $tramFechaResolucion = trim($_POST['tram_fecha_resolucion'] ?? '');
    $tramPrecio          = $_POST['tram_precio'] ?? '';
    $tramNotas           = trim($_POST['tram_notas'] ?? '');

    if ($agregarTramite && $tramTipo !== '') {
        if (!array_key_exists($tramTipo, $tipoLabels)) {
            $errors[] = 'El tipo de tr&aacute;mite no es v&aacute;lido.';
        }
        if (!array_key_exists($tramEstado, $estadoLabels)) {
            $errors[] = 'El estado del tr&aacute;mite no es v&aacute;lido.';
        }
    }

    if (empty($errors)) {
        // INSERT client
        $stmt = $db->prepare("INSERT INTO clientes (nombre, telefono, email, direccion, notas) VALUES (?,?,?,?,?)");
        $stmt->execute([$nombre, $telefono, $email, $direccion, $notas]);
        $newClienteId = (int)$db->lastInsertId();

        // INSERT tramite if requested
        if ($agregarTramite && $tramTipo !== '') {
            $fechaSol  = $tramFechaSolicitud !== '' ? $tramFechaSolicitud : null;
            $fechaCit  = $tramFechaCita !== '' ? $tramFechaCita : null;
            $fechaRes  = $tramFechaResolucion !== '' ? $tramFechaResolucion : null;
            $precio    = $tramPrecio !== '' ? (float)$tramPrecio : null;

            $stmtT = $db->prepare("INSERT INTO tramites (cliente_id, tipo, estado, fecha_solicitud, fecha_cita, fecha_resolucion, precio, notas) VALUES (?,?,?,?,?,?,?,?)");
            $stmtT->execute([
                $newClienteId, $tramTipo, $tramEstado,
                $fechaSol, $fechaCit, $fechaRes,
                $precio, $tramNotas
            ]);
        }

        // Track in session
        $_SESSION['carga_historial_ids'][] = $newClienteId;
        // Keep only the last 50 to avoid session bloat
        if (count($_SESSION['carga_historial_ids']) > 50) {
            $_SESSION['carga_historial_ids'] = array_slice($_SESSION['carga_historial_ids'], -50);
        }

        // Determine redirect
        $submitAction = $_POST['submit_action'] ?? 'add_another';

        if ($submitAction === 'view_client') {
            header("Location: cliente-detalle.php?id=$newClienteId&saved=1");
            exit;
        }

        // Default: add another
        header("Location: carga-historial.php?saved=1");
        exit;
    }
}

// Success message from redirect
if (isset($_GET['saved'])) {
    $success = 'Cliente guardado correctamente. Puede continuar agregando m&aacute;s registros.';
}

// ── Fetch recently added clients for the table below ────────────
$recentClients = [];
$sessionIds = $_SESSION['carga_historial_ids'] ?? [];

if (!empty($sessionIds)) {
    // Get the last 10 IDs (most recent first)
    $lastIds = array_slice($sessionIds, -10);
    $lastIds = array_reverse($lastIds);

    $placeholders = implode(',', array_fill(0, count($lastIds), '?'));
    $sql = "SELECT c.id, c.nombre, c.telefono,
                   (SELECT t.tipo FROM tramites t WHERE t.cliente_id = c.id ORDER BY t.id DESC LIMIT 1) AS ultimo_tramite_tipo
            FROM clientes c
            WHERE c.id IN ($placeholders)
            ORDER BY c.id DESC";
    $stmtRecent = $db->prepare($sql);
    $stmtRecent->execute($lastIds);
    $recentClients = $stmtRecent->fetchAll();
}
?>

<div class="admin-content__header">
    <h1><i class="fas fa-upload"></i> Carga de Historial</h1>
    <p>Entrada r&aacute;pida para cargar clientes y tr&aacute;mites hist&oacute;ricos</p>
</div>

<!-- Alerts -->
<?php if ($success): ?>
<div class="alert alert--success alert--dismissible">
    <i class="fas fa-check-circle"></i>
    <span><?= $success ?></span>
    <button class="alert__close" onclick="this.parentElement.remove()">&times;</button>
</div>
<?php endif; ?>

<?php if (!empty($errors)): ?>
<div class="alert alert--danger">
    <i class="fas fa-exclamation-circle"></i>
    <div>
        <?php foreach ($errors as $err): ?>
            <div><?= $err ?></div>
        <?php endforeach; ?>
    </div>
</div>
<?php endif; ?>

<!-- ============================================================
     Combined Client + Process Form
     ============================================================ -->
<form method="POST" action="carga-historial.php" id="cargaForm">
    <?= csrfField() ?>

    <!-- Client Section -->
    <div class="card" style="margin-bottom: 1.5rem;">
        <div class="card__header">
            <h2><i class="fas fa-user-plus"></i> Datos del Cliente</h2>
        </div>
        <div class="card__body">
            <div class="form-row">
                <div class="form-group">
                    <label>Nombre <span class="required">*</span></label>
                    <input type="text" name="nombre" class="form-control" required autofocus
                           value="<?= htmlspecialchars($_POST['nombre'] ?? '') ?>">
                </div>
                <div class="form-group">
                    <label>Tel&eacute;fono</label>
                    <input type="text" name="telefono" class="form-control"
                           value="<?= htmlspecialchars($_POST['telefono'] ?? '') ?>">
                </div>
            </div>

            <div class="form-row">
                <div class="form-group">
                    <label>Email</label>
                    <input type="email" name="email" class="form-control"
                           value="<?= htmlspecialchars($_POST['email'] ?? '') ?>">
                </div>
            </div>

            <div class="form-group">
                <label>Direcci&oacute;n</label>
                <textarea name="direccion" class="form-control" rows="2"><?= htmlspecialchars($_POST['direccion'] ?? '') ?></textarea>
            </div>

            <div class="form-group">
                <label>Notas</label>
                <textarea name="notas" class="form-control" rows="2"><?= htmlspecialchars($_POST['notas'] ?? '') ?></textarea>
            </div>
        </div>
    </div>

    <!-- Process Section (Optional) -->
    <div class="card" style="margin-bottom: 1.5rem;">
        <div class="card__header">
            <h2><i class="fas fa-file-alt"></i> Tr&aacute;mite (opcional)</h2>
        </div>
        <div class="card__body">
            <div class="form-group" style="margin-bottom: 1rem;">
                <label class="checkbox-label" style="display: inline-flex; align-items: center; gap: 0.5rem; cursor: pointer; font-weight: 500;">
                    <input type="checkbox" name="agregar_tramite" id="agregarTramiteCheck"
                           <?= !empty($_POST) && isset($_POST['agregar_tramite']) ? 'checked' : '' ?>>
                    Agregar tr&aacute;mite para este cliente
                </label>
            </div>

            <div id="tramiteFields" style="<?= !empty($_POST) && isset($_POST['agregar_tramite']) ? '' : 'display: none;' ?>">
                <div class="form-row">
                    <div class="form-group">
                        <label>Tipo de Tr&aacute;mite</label>
                        <select name="tram_tipo" class="form-control">
                            <option value="">-- Seleccionar --</option>
                            <?php foreach ($tipoLabels as $val => $label): ?>
                            <option value="<?= htmlspecialchars($val) ?>"
                                <?= (($_POST['tram_tipo'] ?? '') === $val) ? 'selected' : '' ?>>
                                <?= $label ?>
                            </option>
                            <?php endforeach; ?>
                        </select>
                    </div>
                    <div class="form-group">
                        <label>Estado</label>
                        <select name="tram_estado" class="form-control">
                            <?php foreach ($estadoLabels as $val => $label): ?>
                            <option value="<?= htmlspecialchars($val) ?>"
                                <?= (($_POST['tram_estado'] ?? '') === $val) ? 'selected' : '' ?>>
                                <?= $label ?>
                            </option>
                            <?php endforeach; ?>
                        </select>
                    </div>
                </div>

                <div class="form-row">
                    <div class="form-group">
                        <label>Fecha Solicitud</label>
                        <input type="date" name="tram_fecha_solicitud" class="form-control"
                               value="<?= htmlspecialchars($_POST['tram_fecha_solicitud'] ?? '') ?>">
                    </div>
                    <div class="form-group">
                        <label>Fecha Cita</label>
                        <input type="date" name="tram_fecha_cita" class="form-control"
                               value="<?= htmlspecialchars($_POST['tram_fecha_cita'] ?? '') ?>">
                    </div>
                    <div class="form-group">
                        <label>Fecha Resoluci&oacute;n</label>
                        <input type="date" name="tram_fecha_resolucion" class="form-control"
                               value="<?= htmlspecialchars($_POST['tram_fecha_resolucion'] ?? '') ?>">
                    </div>
                </div>

                <div class="form-row">
                    <div class="form-group">
                        <label>Precio</label>
                        <input type="number" name="tram_precio" class="form-control" step="0.01" min="0"
                               value="<?= htmlspecialchars($_POST['tram_precio'] ?? '') ?>">
                    </div>
                </div>

                <div class="form-group">
                    <label>Notas del Tr&aacute;mite</label>
                    <textarea name="tram_notas" class="form-control" rows="2"><?= htmlspecialchars($_POST['tram_notas'] ?? '') ?></textarea>
                </div>
            </div>
        </div>
    </div>

    <!-- Submit Buttons -->
    <div class="card" style="margin-bottom: 1.5rem;">
        <div class="card__body" style="display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center;">
            <button type="submit" name="submit_action" value="add_another" class="btn btn--primary">
                <i class="fas fa-plus-circle"></i> Guardar y agregar otro
            </button>
            <button type="submit" name="submit_action" value="view_client" class="btn btn--success">
                <i class="fas fa-eye"></i> Guardar y ver cliente
            </button>
            <span style="font-size: var(--admin-font-xs); color: var(--admin-gray-500); margin-left: 0.5rem;">
                <i class="fas fa-info-circle"></i> Use &ldquo;Guardar y agregar otro&rdquo; para carga r&aacute;pida por lotes
            </span>
        </div>
    </div>
</form>

<!-- ============================================================
     Recently Added Clients
     ============================================================ -->
<div class="card">
    <div class="card__header">
        <h2><i class="fas fa-history"></i> Clientes agregados recientemente</h2>
    </div>
    <div class="card__body">
        <?php if (empty($recentClients)): ?>
            <div class="table-empty">
                <i class="fas fa-inbox"></i>
                <p>No se han agregado clientes en esta sesi&oacute;n a&uacute;n.</p>
            </div>
        <?php else: ?>
            <div class="table-responsive">
                <table class="admin-table">
                    <thead>
                        <tr>
                            <th>Nombre</th>
                            <th>Tel&eacute;fono</th>
                            <th>Tr&aacute;mite</th>
                            <th>Acci&oacute;n</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ($recentClients as $rc): ?>
                        <tr>
                            <td><strong><?= htmlspecialchars($rc['nombre']) ?></strong></td>
                            <td><?= htmlspecialchars($rc['telefono'] ?: '-') ?></td>
                            <td>
                                <?php if ($rc['ultimo_tramite_tipo']): ?>
                                    <span class="badge badge--info"><?= htmlspecialchars($tipoLabels[$rc['ultimo_tramite_tipo']] ?? $rc['ultimo_tramite_tipo']) ?></span>
                                <?php else: ?>
                                    <span class="text-muted">-</span>
                                <?php endif; ?>
                            </td>
                            <td>
                                <a href="cliente-detalle.php?id=<?= (int)$rc['id'] ?>" class="btn btn--sm btn--primary">
                                    <i class="fas fa-eye"></i> Ver
                                </a>
                            </td>
                        </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>
        <?php endif; ?>
    </div>
</div>

<!-- Toggle tramite fields -->
<script>
document.addEventListener('DOMContentLoaded', function() {
    var checkbox = document.getElementById('agregarTramiteCheck');
    var fields = document.getElementById('tramiteFields');

    if (checkbox && fields) {
        checkbox.addEventListener('change', function() {
            fields.style.display = this.checked ? '' : 'none';
        });
    }
});
</script>

<?php require_once __DIR__ . '/includes/admin-footer.php'; ?>