<?php
session_start();
require_once __DIR__ . '/config.php';

try {
    $pdo = new PDO("mysql:host=" . DB_HOST, DB_USER, DB_PASS);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // Create DB if not exists
    $pdo->exec("CREATE DATABASE IF NOT EXISTS `" . DB_NAME . "` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci");
    $pdo->exec("USE `" . DB_NAME . "`");

    // Create tables
    $pdo->exec("
        CREATE TABLE IF NOT EXISTS `websites` (
          `id` int(11) NOT NULL AUTO_INCREMENT,
          `name` varchar(255) NOT NULL,
          `url` text NOT NULL,
          `status` enum('normal','cancelled','maintenance') NOT NULL DEFAULT 'normal',
          `logo_url` text NULL,
          `click_count` int(11) NOT NULL DEFAULT 0,
          `display_order` int(11) NOT NULL DEFAULT 0,
          `is_mock` tinyint(1) NOT NULL DEFAULT 0,
          `created_at` timestamp NOT NULL DEFAULT current_timestamp(),
          PRIMARY KEY (`id`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
    ");

    // Add new columns to existing table for V2 upgrade backward compatibility
    try {
        $pdo->exec("ALTER TABLE `websites` ADD COLUMN `status` ENUM('normal', 'cancelled', 'maintenance') NOT NULL DEFAULT 'normal' AFTER `url`");
    } catch (PDOException $e) {}
    try {
        $pdo->exec("ALTER TABLE `websites` ADD COLUMN `logo_url` TEXT NULL AFTER `status`");
    } catch (PDOException $e) {}
    try {
        $pdo->exec("ALTER TABLE `websites` ADD COLUMN `click_count` INT(11) NOT NULL DEFAULT 0 AFTER `logo_url`");
    } catch (PDOException $e) {}
    $pdo->exec("
        CREATE TABLE IF NOT EXISTS `activity_logs` (
          `id` int(11) NOT NULL AUTO_INCREMENT,
          `action` varchar(255) NOT NULL,
          `details` text NOT NULL,
          `ip_address` varchar(45) NOT NULL,
          `created_at` timestamp NOT NULL DEFAULT current_timestamp(),
          PRIMARY KEY (`id`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
    ");

    // Create Settings table
    $pdo->exec("
        CREATE TABLE IF NOT EXISTS `settings` (
          `setting_key` varchar(50) NOT NULL,
          `setting_value` text NOT NULL,
          PRIMARY KEY (`setting_key`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
    ");

    // Insert default settings
    $stmt = $pdo->prepare("INSERT IGNORE INTO `settings` (`setting_key`, `setting_value`) VALUES ('site_name', 'ศูนย์รวมเว็บหน่วยงาน'), ('site_subtitle', 'One Stop Web Service')");
    $stmt->execute();

    // Fetch settings globally
    $stmt = $pdo->query("SELECT setting_key, setting_value FROM settings");
    $globalSettings = [];
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        $globalSettings[$row['setting_key']] = $row['setting_value'];
    }

} catch (PDOException $e) {
    die("Database Connection failed. Please check config.php: " . $e->getMessage());
}

function logAction($pdo, $action, $details) {
    $ip = $_SERVER['REMOTE_ADDR'] ?? '127.0.0.1';
    $stmt = $pdo->prepare("INSERT INTO activity_logs (action, details, ip_address) VALUES (?, ?, ?)");
    $stmt->execute([$action, $details, $ip]);
}

function requireLogin() {
    if (!isset($_SESSION['admin_logged_in']) || $_SESSION['admin_logged_in'] !== true) {
        header("Location: login.php");
        exit;
    }
}