<?php
/**
 * Main Configuration File for Kayal Aqua
 */

// Start session if not already started
if (session_status() == PHP_SESSION_NONE) {
    session_start();
}

// Include database configuration
require_once __DIR__ . '/database.php';

// Application settings
define('APP_NAME', 'Kayal Aqua');
define('APP_VERSION', '1.0.0');
define('APP_URL', 'https://store.kayalaquafarms.shop');

// File upload settings
define('UPLOAD_DIR', __DIR__ . '/../uploads/');
define('MAX_FILE_SIZE', 5 * 1024 * 1024); // 5MB
define('ALLOWED_EXTENSIONS', ['jpg', 'jpeg', 'png', 'pdf']);

// Timezone
date_default_timezone_set('Asia/Kolkata');

// Error reporting (set to 0 in production)
error_reporting(E_ALL);
ini_set('display_errors', 1);

/**
 * Check if user is logged in
 */
function isLoggedIn() {
    return isset($_SESSION['user_id']) && !empty($_SESSION['user_id']);
}

/**
 * Get current user data
 */
function getCurrentUser() {
    if (!isLoggedIn()) {
        return null;
    }
    
    $sql = "SELECT * FROM users WHERE id = ? AND status = 'active'";
    return fetchRow($sql, [$_SESSION['user_id']]);
}

/**
 * Redirect to login if not authenticated
 */
function requireLogin() {
    if (!isLoggedIn()) {
        header('Location: login.php');
        exit;
    }
}

/**
 * Redirect to specific page
 */
function redirect($url) {
    header("Location: $url");
    exit;
}

/**
 * Sanitize input data
 */
function sanitizeInput($data) {
    if (is_array($data)) {
        return array_map('sanitizeInput', $data);
    }
    return htmlspecialchars(trim($data), ENT_QUOTES, 'UTF-8');
}

/**
 * Generate CSRF token
 */
function generateCSRFToken() {
    if (!isset($_SESSION['csrf_token'])) {
        $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
    }
    return $_SESSION['csrf_token'];
}

/**
 * Verify CSRF token
 */
function verifyCSRFToken($token) {
    return isset($_SESSION['csrf_token']) && hash_equals($_SESSION['csrf_token'], $token);
}

/**
 * Format currency
 */
function formatCurrency($amount) {
    return '₹' . number_format($amount, 2);
}

/**
 * Format date for display
 */
function formatDate($date, $format = 'd-m-Y') {
    return date($format, strtotime($date));
}

/**
 * Get business segments
 */
function getBusinessSegments() {
    $sql = "SELECT * FROM business_segments WHERE status = 'active' ORDER BY name";
    return fetchAll($sql);
}

/**
 * Get categories by type
 */
function getCategories($type = null, $segment_id = null) {
    $sql = "SELECT c.*, bs.name as segment_name 
            FROM categories c 
            LEFT JOIN business_segments bs ON c.segment_id = bs.id 
            WHERE c.status = 'active'";
    $params = [];
    
    if ($type) {
        $sql .= " AND c.type = ?";
        $params[] = $type;
    }
    
    if ($segment_id) {
        $sql .= " AND c.segment_id = ?";
        $params[] = $segment_id;
    }
    
    $sql .= " ORDER BY c.name";
    return fetchAll($sql, $params);
}

/**
 * Log activity
 */
function logActivity($action, $description = '') {
    if (!isLoggedIn()) return;
    
    $data = [
        'user_id' => $_SESSION['user_id'],
        'action' => $action,
        'description' => $description,
        'ip_address' => $_SERVER['REMOTE_ADDR'] ?? '',
        'user_agent' => $_SERVER['HTTP_USER_AGENT'] ?? '',
        'created_at' => date('Y-m-d H:i:s')
    ];
    
    // Create activity log table if it doesn't exist
    $sql = "CREATE TABLE IF NOT EXISTS activity_logs (
        id INT AUTO_INCREMENT PRIMARY KEY,
        user_id INT,
        action VARCHAR(100),
        description TEXT,
        ip_address VARCHAR(45),
        user_agent TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id)
    )";
    
    try {
        executeQuery($sql);
        insertData('activity_logs', $data);
    } catch (Exception $e) {
        error_log("Failed to log activity: " . $e->getMessage());
    }
}
?>