<?php
require_once 'config.php';
try {
    $pdo = new PDO('sqlite:' . DB_FILE);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
} catch (PDOException $e) {
    die("Database connection failed: " . $e->getMessage());
}

function query($sql, $params = []) {
    global $pdo;
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    return $stmt;
}

function get_user($id) {
    global $pdo;
    $stmt = $pdo->prepare("SELECT * FROM users WHERE id = ?");
    $stmt->execute([$id]);
    return $stmt->fetch();
}

function get_user_groups($user_id) {
    global $pdo;
    $stmt = $pdo->prepare("SELECT g.* FROM groups g JOIN user_groups ug ON g.id = ug.group_id WHERE ug.user_id = ?");
    $stmt->execute([$user_id]);
    return $stmt->fetchAll();
}

function notify_user($user_id, $message) {
    global $pdo;
    $stmt = $pdo->prepare("INSERT INTO notifications (user_id, message) VALUES (?, ?)");
    $stmt->execute([$user_id, $message]);
    
    // Virtual hook for Email/Telegram/WhatsApp based on user features
    $user = get_user($user_id);
    if($user && isset($user['notify_channels'])) {
        $channels = explode(',', $user['notify_channels']);
        // Here we would actually send the message to the third party API.
        // For MVP we just assume it's sent.
    }
}

function notify_group($group_id, $message) {
    global $pdo;
    $stmt = $pdo->prepare("SELECT user_id FROM user_groups WHERE group_id = ?");
    $stmt->execute([$group_id]);
    $users = $stmt->fetchAll();
    foreach ($users as $u) {
        notify_user($u['user_id'], $message);
    }
}

function notify_waha($action, $module, $item_name) {
    global $pdo;
    try {
        $u_id = $_SESSION['user_id'] ?? 0;
        $current_user_name = "System";
        if($u_id) {
            $u = get_user($u_id);
            if($u) $current_user_name = $u['username'];
        }
        
        $stmt = $pdo->query("SELECT waha_endpoint, waha_chat_id, waha_template FROM users WHERE notify_channels LIKE '%whatsapp%' AND waha_endpoint IS NOT NULL AND waha_endpoint != ''");
        while ($user = $stmt->fetch()) {
            $endpoint = $user['waha_endpoint'];
            $chat_id  = $user['waha_chat_id'];
            $template = $user['waha_template'] ?: "*Update:* {action} on {module} '{item}' by {user}";
            
            if(!$endpoint || !$chat_id) continue;
            
            $text = str_replace(
                ['{action}', '{module}', '{item}', '{user}'],
                [$action, $module, $item_name, $current_user_name],
                $template
            );
            
            $payload = json_encode([
                "chatId" => $chat_id,
                "text" => $text,
                "session" => "default"
            ]);
            
            $ch = curl_init($endpoint);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
            curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
            curl_setopt($ch, CURLOPT_TIMEOUT, 1);
            curl_exec($ch);
            curl_close($ch);
        }
    } catch(Exception $e) {}
}