<?php
ob_start();
header('Content-Type: application/json');

$rootPath = dirname(dirname(__DIR__));
require_once($rootPath . "/src/config/env.php");
require_once($rootPath . '/src/config/functions.php');
require_once($rootPath . '/src/config/connection.php');

// Check admin status
session_start();
if (empty($_SESSION['user_id'])) {
    ob_end_clean();
    echo json_encode(['status' => 'error', 'message' => 'Unauthorized access']);
    exit;
}

$user_role = getUserRole();
if (!in_array($user_role, ['admin', 'superadmin'])) {
    ob_end_clean();
    echo json_encode(['status' => 'error', 'message' => 'Unauthorized access']);
    exit;
}

// // Validate CSRF token
// if (empty($_POST['csrf_token']) || $_POST['csrf_token'] !== ($_SESSION['csrf_token'] ?? '')) {
//     ob_end_clean();
//     echo json_encode(['status' => 'error', 'message' => 'Invalid CSRF token']);
//     exit;
// }

try {
    $trip_id = $_POST['trip_id'] ?? null;
    $trip_name = trim($_POST['trip_name'] ?? '');
    $location = trim($_POST['location'] ?? '');
    $trip_code = trim($_POST['trip_code'] ?? '');
    $vehicle_capacity = intval($_POST['vehicle_capacity'] ?? 0);
    $start_date = trim($_POST['start_date'] ?? '');
    $end_date = trim($_POST['end_date'] ?? '');
    $short_description = trim($_POST['short_description'] ?? '');
    $long_description = trim($_POST['long_description'] ?? '');
    $cost_members = floatval($_POST['cost_members'] ?? 0);
    $cost_nonmembers = floatval($_POST['cost_nonmembers'] ?? 0);
    $cost_pensioner_member = floatval($_POST['cost_pensioner_member'] ?? 0);
    $cost_pensioner = floatval($_POST['cost_pensioner'] ?? 0);
    $booking_fee = floatval($_POST['booking_fee'] ?? 0);

    // Debug: Log received values
    // error_log("START_DATE: " . var_export($start_date, true), 3, $rootPath . "/logs/trip_debug.log");
    // error_log("END_DATE: " . var_export($end_date, true), 3, $rootPath . "/logs/trip_debug.log");

    // Validation
    if (empty($trip_name) || empty($location) || empty($start_date) || empty($end_date)) {
        throw new Exception('Required fields are missing');
    }

    // Validate and format dates (expecting YYYY-MM-DD format from HTML5 date input)
    if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $start_date)) {
        throw new Exception('Start date format invalid: "' . $start_date . '" must be in YYYY-MM-DD format');
    }
    if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $end_date)) {
        throw new Exception('End date format invalid: "' . $end_date . '" must be in YYYY-MM-DD format');
    }

    // Validate dates are actual dates
    $start_timestamp = strtotime($start_date);
    $end_timestamp = strtotime($end_date);
    
    if ($start_timestamp === false) {
        throw new Exception('Invalid start date');
    }
    if ($end_timestamp === false) {
        throw new Exception('Invalid end date');
    }

    if ($vehicle_capacity <= 0) {
        throw new Exception('Vehicle capacity must be greater than 0');
    }

    if ($start_timestamp >= $end_timestamp) {
        throw new Exception('Start date must be before end date');
    }

    // If creating new trip, insert first to get trip_id
    if (!$trip_id) {
        $stmt = $conn->prepare("
            INSERT INTO trips (
                trip_name, location, trip_code, vehicle_capacity, start_date, end_date,
                short_description, long_description, cost_members, cost_nonmembers,
                cost_pensioner_member, cost_pensioner, booking_fee, published, places_booked
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, 0)
        ");

        $stmt->bind_param(
            "sssissssddddd",
            $trip_name, $location, $trip_code, $vehicle_capacity,
            $start_date, $end_date, $short_description, $long_description,
            $cost_members, $cost_nonmembers, $cost_pensioner_member,
            $cost_pensioner, $booking_fee
        );

        if (!$stmt->execute()) {
            throw new Exception('Failed to create trip: ' . $stmt->error);
        }

        $trip_id = $conn->insert_id;
        $stmt->close();
    } else {
        // Update existing trip
        $stmt = $conn->prepare("
            UPDATE trips SET
                trip_name = ?, location = ?, trip_code = ?, vehicle_capacity = ?,
                start_date = ?, end_date = ?, short_description = ?, long_description = ?,
                cost_members = ?, cost_nonmembers = ?, cost_pensioner_member = ?, cost_pensioner = ?,
                booking_fee = ?
            WHERE trip_id = ?
        ");

        $stmt->bind_param(
            "sssissssdddddi",
            $trip_name, $location, $trip_code, $vehicle_capacity,
            $start_date, $end_date, $short_description, $long_description,
            $cost_members, $cost_nonmembers, $cost_pensioner_member, $cost_pensioner,
            $booking_fee,
            $trip_id
        );

        if (!$stmt->execute()) {
            throw new Exception('Failed to update trip: ' . $stmt->error);
        }
        $stmt->close();
    }

    // Handle image uploads
    if (!empty($_FILES['trip_images']['name'][0])) {
        $upload_dir = $rootPath . '/assets/images/trips/';

        // Create directory if it doesn't exist
        if (!is_dir($upload_dir)) {
            mkdir($upload_dir, 0755, true);
        }

        $allowed_extensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
        $image_count = 1;

        foreach ($_FILES['trip_images']['name'] as $key => $filename) {
            if (empty($filename)) continue;

            $file_ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
            
            // Validate file extension
            if (!in_array($file_ext, $allowed_extensions)) {
                throw new Exception('Invalid file type: ' . $filename . '. Only images allowed.');
            }

            // Validate file size (5MB max per file)
            if ($_FILES['trip_images']['size'][$key] > 5 * 1024 * 1024) {
                throw new Exception('File too large: ' . $filename . '. Max 5MB per file.');
            }

            // Generate filename: {trip_id}_0{number}.{ext}
            $new_filename = $trip_id . '_0' . $image_count . '.' . $file_ext;
            $file_path = $upload_dir . $new_filename;

            // Move uploaded file
            if (!move_uploaded_file($_FILES['trip_images']['tmp_name'][$key], $file_path)) {
                throw new Exception('Failed to upload image: ' . $filename);
            }

            // Optimize image (resize if too large)
            // optimizeImage($file_path, 1920, 1080);

            $image_count++;
        }
    }

    ob_end_clean();
    echo json_encode([
        'status' => 'success',
        'message' => $trip_id ? 'Trip updated successfully' : 'Trip created successfully',
        'trip_id' => $trip_id
    ]);

} catch (Exception $e) {
    ob_end_clean();
    echo json_encode(['status' => 'error', 'message' => $e->getMessage()]);
}
?>