// ═══════════════════════════════════════════════════════════════════════════
// 🤖 AI Negotiator — نظام مفاوضة الذكاء الاصطناعي
//
// سياسة التشغيل:
//   Phase 1 — T=20s (تلقائي، بصمت):
//     Flutter يستدعي هذا الملف بعد 20 ثانية بدون قبول.
//     النظام يزيد حصة السائق من عمولة التطبيق كجسر مؤقت.
//     الراكب لا يرى شيئاً.
//
//   Phase 2 — T=45s (بموافقة الراكب):
//     Flutter يعرض Dialog يقترح زيادة 5% من الراكب.
//     إذا قبل: يُرسل new_price جديد لهذا الملف.
//     السعر الجديد يُطبَّق على الراكب والسائق معاً.
//
// الإرسال: dispatchRideToDrivers() يرسل عبر WebSocket أولاً ثم FCM
//   (راجع functions.php — sendSocketNotification + sendFcmNotification)
// ═══════════════════════════════════════════════════════════════════════════
require_once __DIR__ . '/../../connect.php'; 

// 1. استقبال البيانات القادمة من الفلتر
$rideId           = filterRequest("ride_id");
$passengerId      = filterRequest("passenger_id");
$passengerName    = filterRequest("passenger_name");
$passengerPhone   = filterRequest("passenger_phone");
$passengerEmail   = filterRequest("passenger_email");
$passengerToken   = filterRequest("passenger_token");
$passengerWallet  = filterRequest("passenger_wallet");
$isWallet         = filterRequest("is_wallet");
$passengerRating  = filterRequest("passenger_rating");
$startLat         = filterRequest("start_lat");
$startLng         = filterRequest("start_lng");
$endLat           = filterRequest("end_lat");
$endLng           = filterRequest("end_lng");
$startName        = filterRequest("start_name");
$endName          = filterRequest("end_name");
$distance         = filterRequest("distance");
$distanceText     = filterRequest("distance_text");
$durationText     = filterRequest("duration_text");
$price            = filterRequest("price");
$priceForDriver   = filterRequest("price_for_driver");
$carType          = filterRequest("car_type");
$isDestinationMatchFlag = filterRequest("is_destination_match") ?: "0";
$hasSteps = filterRequest("has_steps");
$step0    = filterRequest("step0");
$step1    = filterRequest("step1");
$step2    = filterRequest("step2");
$step3    = filterRequest("step3");
$step4    = filterRequest("step4");

// Phase 2: إذا أرسل الراكب new_price (وافق على الزيادة المقترحة من الـ AI)
// هذا يتجاوز Phase 1 ويطبق السعر الجديد مباشرةً على الراكب والسائق
$newPriceFromPassenger = filterRequest("new_price");
if ($newPriceFromPassenger && (float)$newPriceFromPassenger > (float)$price) {
    $price        = $newPriceFromPassenger;
    // نحافظ على نسبة الكيزان (عمولة التطبيق) الأصلية — الزيادة للراكب والسائق معاً
    $originalRatio = ((float)$priceForDriver > 0 && (float)$priceForDriver < (float)$price)
        ? (float)$priceForDriver / (float)$price
        : 0.86; // default 86% للسائق
    $priceForDriver = number_format((float)$price * $originalRatio, 2, '.', '');
    error_log("[AI Negotiator Phase 2] Passenger accepted price increase: old=$price → new={$newPriceFromPassenger}");
}

if (!$rideId) {
    jsonError("Missing Ride ID");
    exit;
}

// ═══════════════════════════════════════════════════════════════════════════
// 🤖 STEP 0: AI Negotiator — Read & Increment Rejection Counter (Redis-first)
// ═══════════════════════════════════════════════════════════════════════════
$rejectionCount    = 0;
$aiBonus           = 0.0;
$aiRedisKey        = "ai:ride_rejections:{$rideId}";
$originalKazan     = (float)$price - (float)$priceForDriver;

// Bonus Tiers: after N rejections, give driver this much extra from our commission
// These values come from our share (kazan), never from the passenger's price
$bonusTiers = [
    1 => 0.05,  // 1st retry: 5% of price → added to driver share
    2 => 0.10,  // 2nd retry: 10%
    3 => 0.15,  // 3rd retry: 15%
];
$maxBonusFraction = 0.20; // Cap: never give away more than 20% of price as bonus

try {
    // Read current rejection count from Redis (O(1))
    if (isset($redis)) {
        $storedCount = $redis->get($aiRedisKey);
        if ($storedCount !== false) {
            $rejectionCount = (int)$storedCount;
        }
        // Increment rejection count (this retry = another rejection)
        $rejectionCount++;
        $redis->setex($aiRedisKey, 3600, $rejectionCount); // TTL: 1 hour
    }

    // Calculate bonus based on rejection tier
    $tierKey = min($rejectionCount, max(array_keys($bonusTiers)));
    $bonusFraction = $bonusTiers[$tierKey] ?? $bonusTiers[max(array_keys($bonusTiers))];
    $bonusFraction = min($bonusFraction, $maxBonusFraction);
    $aiBonus = round((float)$price * $bonusFraction, 2);

    // Never give more than what we actually earn as commission (kazan)
    if ($aiBonus > $originalKazan) {
        $aiBonus = round($originalKazan * 0.80, 2); // Keep 20% for ourselves minimum
    }

    // Apply bonus: increase driver's price, reduce our kazan
    if ($aiBonus > 0) {
        $priceForDriver = number_format((float)$priceForDriver + $aiBonus, 2, '.', '');
        error_log("[AI Negotiator] RideID={$rideId} | Rejection #{$rejectionCount} | Bonus={$aiBonus} | New priceForDriver={$priceForDriver}");
    }

} catch (Exception $e) {
    error_log("[AI Negotiator] Redis error: " . $e->getMessage());
    // Non-fatal: continue without bonus
}

try {
    // 2. تحديث حالة الرحلة + تسجيل الـ bonus في قاعدة البيانات
    $updateStmt = $con->prepare("
        UPDATE ride 
        SET status = 'waiting', 
            driver_id = 0, 
            updated_at = NOW(),
            ai_negotiated_bonus = :bonus,
            price_for_driver = :new_driver_price
        WHERE id = :id
    ");
    $updateStmt->execute([
        ':bonus'            => $aiBonus,
        ':new_driver_price' => $priceForDriver,
        ':id'               => $rideId,
    ]);

    // 3. حساب العمولة (Kazan) المُحدَّثة بعد الـ bonus
    $kazan = (float)$price - (float)$priceForDriver;
    if ($kazan < 0) $kazan = 0; // Floor protection

    $passengerFp = isset($_SERVER['HTTP_X_DEVICE_FP']) ? $_SERVER['HTTP_X_DEVICE_FP'] : '';

    // 4. بناء Payload (0 - 33) — مطابق لـ add_ride.php
    $payloadTemplate = [];
    $payloadTemplate[0]  = (string)$startLat;
    $payloadTemplate[1]  = (string)$startLng;
    $payloadTemplate[2]  = (string)number_format((float)$price, 2, '.', '');
    $payloadTemplate[3]  = (string)$endLat;
    $payloadTemplate[4]  = (string)$endLng;
    $payloadTemplate[5]  = (string)$distanceText;
    $payloadTemplate[6]  = (string)$passengerFp;
    $payloadTemplate[7]  = (string)$passengerId;
    $payloadTemplate[8]  = (string)$passengerName;
    $payloadTemplate[9]  = (string)$passengerToken;
    $payloadTemplate[10] = (string)$passengerPhone;
    $payloadTemplate[11] = (string)$distance;
    $payloadTemplate[12] = "1";
    $payloadTemplate[13] = (string)$isWallet;
    $payloadTemplate[14] = (string)$distance;
    $payloadTemplate[15] = (string)$durationText;
    $payloadTemplate[16] = (string)$rideId;
    $payloadTemplate[17] = "";
    $payloadTemplate[18] = ""; // Driver ID placeholder
    $payloadTemplate[19] = (string)$durationText;
    $payloadTemplate[20] = (string)$hasSteps;
    $payloadTemplate[21] = (string)$step0;
    $payloadTemplate[22] = (string)$step1;
    $payloadTemplate[23] = (string)$step2;
    $payloadTemplate[24] = (string)$step3;
    $payloadTemplate[25] = (string)$step4;
    $payloadTemplate[26] = (string)number_format((float)$priceForDriver, 2, '.', ''); // ← Updated with bonus
    $payloadTemplate[27] = (string)$passengerWallet;
    $payloadTemplate[28] = (string)$passengerEmail;
    $payloadTemplate[29] = (string)$startName;
    $payloadTemplate[30] = (string)$endName;
    $payloadTemplate[31] = (string)$carType;
    $payloadTemplate[32] = (string)number_format($kazan, 2, '.', ''); // ← Reduced kazan
    $payloadTemplate[33] = (string)$passengerRating;

    ksort($payloadTemplate);
    $payloadTemplate = array_values($payloadTemplate);

    // 5. البحث عن السائقين وإرسال الطلب
    $latVal = doubleval($startLat);
    $lngVal = doubleval($startLng);
    
    $driversData = findBestDrivers($con, $latVal, $lngVal, $carType, $endLat, $endLng);
    
    // ═══════════════════════════════════════════════════════════════
    // 🆕 Destination Matching Priority — Multi-Driver (Retry Round)
    //    السياسة: لما ما في أحد يقبل الرحلة بعد 20 ثانية، Flutter
    //    يستدعي هذا الملف تلقائياً (AI Negotiator يزيد حصة السائق)
    //    في نفس الوقت، نضع السائقين ذوي الوجهة المطابقة في المقدمة
    //    بدون خصم إضافي (الخصم 14% تم مسبقاً في التسعير)
    //    إذا كان أكثر من سائق يملك نفس المنطقة كوجهة، نرسل للجميع
    // ═══════════════════════════════════════════════════════════════
    if ($isDestinationMatchFlag === "1" && isset($redis)) {
        try {
            $allMatchedIds = $redis->geoRadius(
                'geo:driver:destinations',
                (float)$endLng,
                (float)$endLat,
                3.5,
                'km',
                ['COUNT' => 10, 'ASC']
            );

            if (!empty($allMatchedIds)) {
                $alreadyInList = [];
                foreach ($driversData as $d) {
                    $alreadyInList[$d['captain_id'] ?? $d['driver_id'] ?? ''] = true;
                }

                $matchedToFront = [];
                foreach ($allMatchedIds as $mid) {
                    $mid = (string)$mid;
                    // Validate still active today
                    $detailJson = $redis->get("driver:destination:{$mid}");
                    $detail = $detailJson ? json_decode($detailJson, true) : null;
                    if (!$detail || empty($detail['is_active']) || ($detail['usage_date'] ?? '') !== date('Y-m-d')) {
                        $redis->zRem('geo:driver:destinations', $mid);
                        continue;
                    }
                    if (isset($alreadyInList[$mid])) {
                        foreach ($driversData as $k => $d) {
                            $did = $d['captain_id'] ?? $d['driver_id'] ?? '';
                            if ((string)$did === $mid) {
                                $driversData[$k]['is_destination_match'] = 1;
                                $matchedToFront[] = $driversData[$k];
                                unset($driversData[$k]);
                                break;
                            }
                        }
                    } else {
                        $stmtD = $con->prepare("SELECT token FROM driverToken WHERE captain_id = :d LIMIT 1");
                        $stmtD->execute([':d' => $mid]);
                        $dT = $stmtD->fetchColumn();
                        if ($dT) {
                            $matchedToFront[] = [
                                'captain_id'           => $mid,
                                'driver_id'            => $mid,
                                'token'                => $dT,
                                'is_destination_match' => 1
                            ];
                        }
                    }
                }
                $driversData = array_values($driversData);
                $driversData = array_merge($matchedToFront, $driversData);
                error_log("[retry] " . count($matchedToFront) . " destination-matched driver(s) moved to front.");
            }
        } catch (Exception $e) {
            error_log("[retry] Destination priority error: " . $e->getMessage());
        }
    }

    if (!empty($driversData)) {
        dispatchRideToDrivers($driversData, $rideId, $payloadTemplate, $startName, $encryptionHelper);
    }

    // Return with bonus info so Flutter can log it
    jsonSuccess([
        'rejection_count'   => $rejectionCount,
        'ai_bonus_applied'  => $aiBonus,
        'new_driver_price'  => $priceForDriver,
    ], "Ride reset and resent to drivers");

} catch (PDOException $e) {
    error_log("[retry_search_drivers] " . $e->getMessage());
    jsonError("DB Error");
}
?>