<?php
require_once __DIR__ . '/../db/config.php';
require_once __DIR__ . '/../includes/functions.php';
require_once __DIR__ . '/../includes/WablasService.php';

// Enable error logging for cron
ini_set('log_errors', 1);
$logFile = __DIR__ . '/../storage/cron_debug.log';
ini_set('error_log', $logFile);

// Helper to log with timestamp
function cron_log($msg) {
    global $logFile;
    file_put_contents($logFile, "[" . date('Y-m-d H:i:s') . "] " . $msg . "\n", FILE_APPEND);
}

try {
    $settings = get_company_settings();
    
    if (empty($settings['whatsapp_report_enabled']) || empty($settings['whatsapp_report_number']) || empty($settings['whatsapp_report_time'])) {
        // Silent exit if disabled or missing config
        exit;
    }

    $timezone = !empty($settings['timezone']) ? $settings['timezone'] : 'UTC';
    date_default_timezone_set($timezone);

    $reportTime = $settings['whatsapp_report_time']; 

    $lastReportFile = __DIR__ . '/../storage/last_daily_report.txt';
    $lastReportDate = file_exists($lastReportFile) ? trim(file_get_contents($lastReportFile)) : '';

    $nowDt = new DateTime('now', new DateTimeZone($timezone));
    
    $targetTodayDt = clone $nowDt;
    $timeParts = explode(':', $reportTime);
    $targetTodayDt->setTime((int)$timeParts[0], (int)($timeParts[1] ?? 0), 0);
    
    $diffToday = $nowDt->getTimestamp() - $targetTodayDt->getTimestamp();
    
    // Check if within 15 minutes (900 seconds) after the target time AND not sent today
    if ($diffToday >= 0 && $diffToday <= 900 && $lastReportDate !== $nowDt->format('Y-m-d')) {
        cron_log("Condition met: sending daily report for " . $nowDt->format('Y-m-d'));
        
        $pdo = db();
        $today = $nowDt->format('Y-m-d');

        // 1. Calculate Stats
        // Total Revenue Today
        $stmt = $pdo->prepare("SELECT SUM(total_amount) FROM orders WHERE DATE(created_at) = ? AND status != 'cancelled'");
        $stmt->execute([$today]);
        $revenueToday = $stmt->fetchColumn() ?: 0;

        // Total Orders Today
        $stmt = $pdo->prepare("SELECT COUNT(*) FROM orders WHERE DATE(created_at) = ? AND status != 'cancelled'");
        $stmt->execute([$today]);
        $ordersToday = $stmt->fetchColumn();

        // Total Expenses Today
        $stmt = $pdo->prepare("SELECT SUM(amount) FROM expenses WHERE DATE(expense_date) = ?");
        $stmt->execute([$today]);
        $expensesToday = $stmt->fetchColumn() ?: 0;
        
        // Currency
        $currency = $settings['currency_symbol'] ?? '$';

        // 2. Format Message
        $message = "📅 *Daily Report* 📅\n";
        $message .= "Date: " . $today . "\n\n";
        $message .= "💰 *Sales:* " . format_currency_simple($revenueToday, $settings) . "\n";
        $message .= "🧾 *Orders:* " . $ordersToday . "\n";
        $message .= "💸 *Expenses:* " . format_currency_simple($expensesToday, $settings) . "\n";
        $message .= "\n--------------------------\n";
        $message .= "🤖 Auto-generated message";

        // 3. Send Message
        $wablas = new WablasService($pdo);
        // Handle multiple recipients (comma separated)
        $recipients = explode(',', $settings['whatsapp_report_number']);
        $anySuccess = false;

        foreach ($recipients as $recipient) {
            $recipient = trim($recipient);
            if (empty($recipient)) continue;
            
            cron_log("Sending report to: " . $recipient);
            $result = $wablas->sendMessage($recipient, $message);
            
            if (!empty($result['success']) && $result['success'] == true) {
                cron_log("Report sent successfully to " . $recipient);
                $anySuccess = true;
            } else {
                cron_log("Failed to send report to " . $recipient . ": " . ($result['message'] ?? 'Unknown error'));
            }
        }

        if ($anySuccess) {
            file_put_contents($lastReportFile, $today);
        }
    }
    // Else: silent skip

} catch (Exception $e) {
    cron_log("CRITICAL ERROR: " . $e->getMessage());
}

function format_currency_simple($amount, $settings) {
    $symbol = $settings['currency_symbol'] ?? '$';
    $decimals = (int)($settings['currency_decimals'] ?? 2);
    $position = $settings['currency_position'] ?? 'before';
    
    $formatted = number_format((float)$amount, $decimals);
    return ($position === 'after') ? "$formatted $symbol" : "$symbol $formatted";
}