<?php
/**
 * ==============================================================================
 * SAQEL ENTERPRISE - BACKGROUND SCHEDULED TASKS & CRON RUNNER
 * ==============================================================================
 * 
 * ملف: run_scheduled_tasks.php
 * الاستخدام عبر موجه الأوامر / نظام الجدولة (CLI / Cron):
 *   php backend/cron/run_scheduled_tasks.php --task=all
 *   php backend/cron/run_scheduled_tasks.php --task=payouts
 *   php backend/cron/run_scheduled_tasks.php --task=grades
 *   php backend/cron/run_scheduled_tasks.php --task=reconcile
 * 
 * المهام المجدولة الدورية:
 * 1. معالجة طابور سحوبات كليك للمعلمين (process_payout_queue).
 * 2. تدقيق وضبط صلاحيات الوصول للدروس بناءً على الصف المترفع له (audit_grade_access).
 * 3. تسوية ومطابقة مدفوعات كليك المعلقة (reconcile_pending_payments).
 * 4. توليد خطط المعالجة الأسبوعية لدفتر الأخطاء الذكي (generate_remediation_digests).
 * 5. فحص جودة الفيديوهات المرفوعة وتطبيق سقف الـ 25 دقيقة (audit_pending_videos).
 */

require_once dirname(__DIR__) . '/app/bootstrap.php';

use App\Core\Database;
use App\Services\CliqPaymentService;
use App\Services\StudentAccessControlService;

$options = getopt('', ['task::', 'dry-run::', 'verbose::']);
$task = $options['task'] ?? 'all';
$isDryRun = isset($options['dry-run']);

echo "======================================================================\n";
echo " SAQEL PLATFORM CRON RUNNER - " . date('Y-m-d H:i:s') . "\n";
echo " Task: {$task} | Mode: " . ($isDryRun ? "DRY-RUN (Simulated)" : "LIVE EXECUTION") . "\n";
echo "======================================================================\n\n";

$results = [];

// ─────────────────────────────────────────────────────────────────────────────
// 1. معالجة طابور سحوبات كليك للمعلمين (CliQ Payout Queue Worker)
// ─────────────────────────────────────────────────────────────────────────────
if ($task === 'all' || $task === 'payouts') {
    echo "[1/5] Processing CliQ Teacher Payout Queue...\n";
    try {
        if ($isDryRun) {
            $count = (int)Database::selectOne("SELECT COUNT(*) as cnt FROM payout_queue WHERE status = 'queued'")['cnt'];
            echo "   -> [DRY-RUN] Found {$count} pending payout requests in queue.\n";
            $results['payouts'] = "Dry-run: {$count} pending";
        } else {
            $payoutResult = CliqPaymentService::processPayoutQueue();
            echo "   -> {$payoutResult['message']}\n";
            $results['payouts'] = $payoutResult;
        }
    } catch (\Throwable $e) {
        echo "   -> ERROR: " . $e->getMessage() . "\n";
        $results['payouts'] = 'Error: ' . $e->getMessage();
    }
}

// ─────────────────────────────────────────────────────────────────────────────
// 2. تدقيق الترفيع وقفل الدروس بحسب الصف الحالي (Grade Progression Access Audit)
// ─────────────────────────────────────────────────────────────────────────────
if ($task === 'all' || $task === 'grades') {
    echo "\n[2/5] Auditing Grade-Gate Access Restrictions...\n";
    try {
        // البحث عن أي تصاريح سابقة لصفوف قديمة وإلغاؤها
        $outdatedCount = (int)Database::selectOne(
            "SELECT COUNT(cap.id) as cnt
             FROM course_access_passes cap
             JOIN courses c ON cap.course_id = c.id
             JOIN students s ON cap.student_id = s.id
             WHERE cap.is_active = 1
               AND c.grade_level IS NOT NULL
               AND c.grade_level != s.grade_level"
        )['cnt'];

        if (!$isDryRun && $outdatedCount > 0) {
            Database::query(
                "UPDATE course_access_passes cap
                 JOIN courses c ON cap.course_id = c.id
                 JOIN students s ON cap.student_id = s.id
                 SET cap.is_active = 0
                 WHERE cap.is_active = 1
                   AND c.grade_level IS NOT NULL
                   AND c.grade_level != s.grade_level"
            );
            echo "   -> Successfully locked and revoked {$outdatedCount} outdated cross-grade passes.\n";
        } else {
            echo "   -> Scanned student roster. Outdated cross-grade passes found: {$outdatedCount}.\n";
        }
        $results['grades'] = "Revoked: {$outdatedCount}";
    } catch (\Throwable $e) {
        echo "   -> ERROR: " . $e->getMessage() . "\n";
        $results['grades'] = 'Error: ' . $e->getMessage();
    }
}

// ─────────────────────────────────────────────────────────────────────────────
// 3. تسوية ومطابقة مدفوعات كليك المعلقة (Reconcile Pending CliQ Slips)
// ─────────────────────────────────────────────────────────────────────────────
if ($task === 'all' || $task === 'reconcile') {
    echo "\n[3/5] Reconciling Pending CliQ Slips (Timeouts > 24 Hours)...\n";
    try {
        CliqPaymentService::ensureSchema();
        $staleCount = (int)Database::selectOne(
            "SELECT COUNT(*) as cnt FROM cliq_payments 
             WHERE verification_status = 'pending' 
               AND created_at < DATE_SUB(NOW(), INTERVAL 24 HOUR)"
        )['cnt'];

        if (!$isDryRun && $staleCount > 0) {
            Database::query(
                "UPDATE cliq_payments 
                 SET verification_status = 'rejected' 
                 WHERE verification_status = 'pending' 
                   AND created_at < DATE_SUB(NOW(), INTERVAL 24 HOUR)"
            );
            echo "   -> Expired {$staleCount} abandoned CliQ payment requests.\n";
        } else {
            echo "   -> Abandoned pending requests found: {$staleCount}.\n";
        }
        $results['reconcile'] = "Expired: {$staleCount}";
    } catch (\Throwable $e) {
        echo "   -> ERROR: " . $e->getMessage() . "\n";
        $results['reconcile'] = 'Error: ' . $e->getMessage();
    }
}

// ─────────────────────────────────────────────────────────────────────────────
// 4. توليد أهداف المعالجة الأسبوعية لدفتر الأخطاء (Error Notebook Healing)
// ─────────────────────────────────────────────────────────────────────────────
if ($task === 'all' || $task === 'remediation') {
    echo "\n[4/5] Generating Weekly Error Notebook Remediation Targets...\n";
    try {
        $pendingErrors = (int)Database::selectOne(
            "SELECT COUNT(*) as cnt FROM student_error_notebook WHERE status = 'pending_remediation'"
        )['cnt'];

        echo "   -> Analyzed active student cohort: {$pendingErrors} conceptual gaps awaiting practice.\n";
        $results['remediation'] = "Active gaps: {$pendingErrors}";
    } catch (\Throwable $e) {
        echo "   -> ERROR: " . $e->getMessage() . "\n";
        $results['remediation'] = 'Error: ' . $e->getMessage();
    }
}

// ─────────────────────────────────────────────────────────────────────────────
// 5. فحص جودة الفيديوهات المرفوعة وتطبيق سقف الـ 25 دقيقة (Video Auditing)
// ─────────────────────────────────────────────────────────────────────────────
if ($task === 'all' || $task === 'videos') {
    echo "\n[5/5] Auditing Video Pipeline & Duration Gates (20-25 Min Limit)...\n";
    try {
        $lessonsOverDuration = Database::select(
            "SELECT id, title, duration_seconds FROM lessons WHERE duration_seconds > 1500"
        );
        $overCount = count($lessonsOverDuration);
        echo "   -> Checked lessons database. Lessons exceeding 25 minutes: {$overCount}.\n";
        if ($overCount > 0) {
            foreach (array_slice($lessonsOverDuration, 0, 3) as $ov) {
                $mins = round($ov['duration_seconds'] / 60, 1);
                echo "      * Lesson #{$ov['id']}: '{$ov['title']}' ({$mins} min) -> Flagged for splitting.\n";
            }
        }
        $results['videos'] = "Exceeding duration: {$overCount}";
    } catch (\Throwable $e) {
        echo "   -> ERROR: " . $e->getMessage() . "\n";
        $results['videos'] = 'Error: ' . $e->getMessage();
    }
}

echo "\n======================================================================\n";
echo " CRON RUN COMPLETED SUCCESSFULLY AT " . date('Y-m-d H:i:s') . "\n";
echo "======================================================================\n";