<?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 compile_waha_template($template, $context) {
    if (!$template) return "";
    $action = $context['action'] ?? 'Update';
    $module = $context['module'] ?? 'System';
    $item = $context['item'] ?? '';
    
    $user = $context['user'] ?? null;
    if (!$user && isset($_SESSION['user_id'])) {
        $u = get_user($_SESSION['user_id']);
        $user = $u ? $u['username'] : 'System';
    } elseif (!$user) {
        $user = 'System';
    }
    
    $attachment_count = $context['attachment_count'] ?? '0';
    $due_date = $context['due_date'] ?? 'None';
    $created_date = $context['created_date'] ?? date('Y-m-d H:i');
    $updated_date = $context['updated_date'] ?? date('Y-m-d H:i');
    $assignor = $context['assignor'] ?? 'N/A';
    $assignee = $context['assignee'] ?? 'N/A';

    return str_replace(
        ['{action}', '{module}', '{item}', '{user}', '{attachment_count}', '{due_date}', '{created_date}', '{updated_date}', '{assignor}', '{assignee}'],
        [$action, $module, $item, $user, $attachment_count, $due_date, $created_date, $updated_date, $assignor, $assignee],
        $template
    );
}

function dispatch_waha_message($endpoint, $chat_id, $session, $api_key, $text) {
    try {
        $payload = json_encode([
            "chatId"  => $chat_id,
            "text"    => $text,
            "session" => $session ?: 'default'
        ]);
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        $headers = ['Content-Type: application/json'];
        if (!empty($api_key)) $headers[] = 'X-Api-Key: ' . $api_key;
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_TIMEOUT, 2);
        curl_exec($ch);
        curl_close($ch);
    } catch(Exception $e) {}
}

function notify_user($user_id, $message, $context = []) {
    global $pdo;
    $stmt = $pdo->prepare("INSERT INTO notifications (user_id, message) VALUES (?, ?)");
    $stmt->execute([$user_id, $message]);
    
    $user = get_user($user_id);
    if($user && isset($user['notify_channels'])) {
        $channels = explode(',', $user['notify_channels']);
        if (in_array('whatsapp', $channels) && $user['waha_endpoint'] && $user['waha_chat_id']) {
            $module = $context['module'] ?? '';
            $template = '';
            if (stripos($module, 'Note') !== false) $template = $user['waha_template_note'];
            elseif (stripos($module, 'Password') !== false) $template = $user['waha_template_password'];
            elseif (stripos($module, 'File') !== false || stripos($module, 'Folder') !== false) $template = $user['waha_template_file'];
            else $template = $user['waha_template_task'];
            
            if (!$template) $template = "*Alert:* {action} on {module} '{item}' by {user}";
            
            $text = compile_waha_template($template, $context);
            dispatch_waha_message($user['waha_endpoint'], $user['waha_chat_id'], $user['waha_session'], $user['waha_api_key'], $text);
        }
    }
}

function notify_group($group_id, $message, $context = []) {
    global $pdo;
    // Notify all individual group members in their UI notifications
    $stmt = $pdo->prepare("SELECT user_id FROM user_groups WHERE group_id = ?");
    $stmt->execute([$group_id]);
    $users = $stmt->fetchAll();
    foreach ($users as $u) {
        $s = $pdo->prepare("INSERT INTO notifications (user_id, message) VALUES (?, ?)");
        $s->execute([$u['user_id'], $message]);
    }
    
    // Check if the group itself has WAHA configured
    $stmt = $pdo->prepare("SELECT * FROM groups WHERE id = ?");
    $stmt->execute([$group_id]);
    $group = $stmt->fetch();
    
    if($group && isset($group['notify_channels'])) {
        $channels = explode(',', $group['notify_channels']);
        if (in_array('whatsapp', $channels) && $group['waha_endpoint'] && $group['waha_chat_id']) {
            $module = $context['module'] ?? '';
            $template = '';
            if (stripos($module, 'Note') !== false) $template = $group['waha_template_note'];
            elseif (stripos($module, 'Password') !== false) $template = $group['waha_template_password'];
            elseif (stripos($module, 'File') !== false || stripos($module, 'Folder') !== false) $template = $group['waha_template_file'];
            else $template = $group['waha_template_task'];
            
            if (!$template) $template = "*Group Alert:* {action} on {module} '{item}' by {user}";
            
            $text = compile_waha_template($template, $context);
            dispatch_waha_message($group['waha_endpoint'], $group['waha_chat_id'], $group['waha_session'], $group['waha_api_key'], $text);
        }
    }
}