<?php
// ============================================================
// Admin/marketing/trigger_campaign.php
// API Endpoint to trigger Gemini AI campaign generation and dispatch
// ============================================================

require_once __DIR__ . '/../../connect.php';
require_once __DIR__ . '/../../core/Services/SiroGeminiService.php';

// 1. Authorize Admin/Super Admin
if ($role !== 'admin' && $role !== 'super_admin') {
    http_response_code(403);
    echo json_encode(['status' => 'failure', 'message' => 'Unauthorized access. Admin role required.']);
    exit;
}

// 2. Filter inputs
$regionName  = filterRequest('region_name') ?? 'Damascus';
$countryCode = filterRequest('country_code') ?? 'SY';
$siroBasePrice = filterRequest('siro_base_price', 'float') ?? 10000.0;

try {
    // 3. Fetch recent competitor prices for this region to supply context to Gemini
    $sqlPrices = "SELECT competitor_name, price_amount AS total_price, (price_amount / price_per_km) AS distance_km 
                  FROM scraped_competitor_prices 
                  WHERE country_code = :country AND price_per_km > 0
                  ORDER BY created_at DESC LIMIT 10";
    $stmtPrices = $con->prepare($sqlPrices);
    $stmtPrices->execute([':country' => strtoupper($countryCode)]);
    $competitorPrices = $stmtPrices->fetchAll(PDO::FETCH_ASSOC);

    if (empty($competitorPrices)) {
        // Fallback mock context if no competitor pricing has been scraped yet
        $competitorPrices = [
            ['competitor_name' => 'yallago', 'total_price' => 12000, 'distance_km' => 5],
            ['competitor_name' => 'zaken', 'total_price' => 11500, 'distance_km' => 5]
        ];
    }

    // 4. Initialize Gemini AI service and run market analysis
    $geminiService = new SiroGeminiService();
    $aiCampaign = $geminiService->analyzeMarketAndDraftCampaign(
        $competitorPrices,
        $siroBasePrice,
        $regionName,
        $countryCode
    );

    if (!$aiCampaign) {
        jsonError("Failed to generate campaign via Gemini AI service.");
    }

    // Check if campaign is recommended
    $opportunityDetected = $aiCampaign['opportunity_detected'] ?? false;
    if (!$opportunityDetected) {
        jsonSuccess([
            'campaign_created' => false,
            'reason' => 'Gemini AI determined no marketing opportunity is present based on current pricing structures.',
            'ai_analysis' => $aiCampaign
        ]);
    }

    $promoCode = $aiCampaign['promo_code'] ?? 'SIROGO10';
    $discountVal = $aiCampaign['discount_percentage'] ?? 10;
    $pushTitle = $aiCampaign['push_title'] ?? 'خصومات مميزة من سيرو!';
    $pushBody = $aiCampaign['push_body'] ?? 'وفر أكثر على رحلتك القادمة معنا.';
    $smsBody = $aiCampaign['sms_body'] ?? 'اشتقنا لك! عد إلينا ووفر أكثر مع الرمز الترويجي الخاص بك.';

    // 5. Target Passengers in the specified country
    // Since phone numbers are encrypted, we fetch all passengers, decrypt, and filter by country prefix.
    $sqlTarget = "SELECT id AS passenger_id, phone FROM passengers";
    $stmtTarget = $con->prepare($sqlTarget);
    $stmtTarget->execute();
    $allPassengers = $stmtTarget->fetchAll(PDO::FETCH_ASSOC);

    $targets = [];
    $debugCounts = ['JO' => 0, 'SY' => 0, 'EG' => 0, 'IQ' => 0, 'UNKNOWN' => 0, 'DECRYPT_FAIL' => 0];
    foreach ($allPassengers as $p) {
        $decryptedPhone = $encryptionHelper->decryptData($p['phone']);
        if (!$decryptedPhone) {
            $debugCounts['DECRYPT_FAIL']++;
            continue;
        }
        
        $cleanPhone = preg_replace('/[^0-9]/', '', $decryptedPhone);
        $pCountry = 'UNKNOWN';
        if (strpos($cleanPhone, '962') === 0 || strpos($cleanPhone, '07') === 0) $pCountry = 'JO';
        elseif (strpos($cleanPhone, '963') === 0 || (strpos($cleanPhone, '09') === 0 && strlen($cleanPhone) == 10)) $pCountry = 'SY';
        elseif (strpos($cleanPhone, '20') === 0 || (strpos($cleanPhone, '01') === 0 && strlen($cleanPhone) == 11)) $pCountry = 'EG';
        elseif (strpos($cleanPhone, '964') === 0) $pCountry = 'IQ';
        
        $debugCounts[$pCountry]++;
        
        if ($pCountry === strtoupper($countryCode)) {
            $targets[] = ['passenger_id' => $p['passenger_id'], 'decrypted_phone' => $decryptedPhone];
        }
    }

    $sentFcm = 0;
    $sentSms = 0;
    $sentWhatsApp = 0;
    $dispatchedPassengers = [];

    // 6. Save broadcast promo for this campaign (Option 1 - promos table adjustment)
    $sqlPromo = "INSERT INTO promos 
                 (promo_code, amount, description, passengerID, source, validity_start_date, validity_end_date) 
                 VALUES (:code, :amount, :desc, 'all', 'ai_generated', CURDATE(), DATE_ADD(CURDATE(), INTERVAL 7 DAY))";
    $stmtPromo = $con->prepare($sqlPromo);
    $stmtPromo->execute([
        ':code' => $promoCode,
        ':amount' => (string)$discountVal,
        ':desc' => "AI Dynamic Promo: $promoCode ($discountVal%)"
    ]);

    foreach ($targets as $target) {
        $passengerId = $target['passenger_id'];

        // Enforce anti-spam: check if passenger received any SMS/WhatsApp campaign in the last 24 hours
        $sqlSpamCheck = "SELECT COUNT(*) FROM marketing_campaigns_log 
                         WHERE passenger_id = :pid 
                         AND message_type IN ('sms', 'whatsapp') 
                         AND sent_at > DATE_SUB(NOW(), INTERVAL 24 HOUR)";
        $stmtSpam = $con->prepare($sqlSpamCheck);
        $stmtSpam->execute([':pid' => $passengerId]);
        $spamCount = intval($stmtSpam->fetchColumn());

        // Check if passenger has active FCM token
        $sqlToken = "SELECT token FROM tokens WHERE passengerID = :pid LIMIT 1";
        $stmtToken = $con->prepare($sqlToken);
        $stmtToken->execute([':pid' => $passengerId]);
        $fcmToken = $stmtToken->fetchColumn();

        $pushSent = false;
        if ($fcmToken) {
            $decryptedToken = $encryptionHelper->decryptData($fcmToken);
            if ($decryptedToken) {
                // Send FCM Push Notification (Free channel - no anti-spam restriction needed)
                $fcmData = [
                    'type' => 'marketing_campaign',
                    'promo_code' => $promoCode,
                    'discount' => (string)$discountVal
                ];
                
                $fcmResult = sendFcmNotification(
                    $decryptedToken,
                    $pushTitle,
                    $pushBody,
                    $fcmData,
                    'Marketing',
                    'notification'
                );

                if ($fcmResult['status'] === 'success') {
                    $sentFcm++;
                    // Log campaign dispatch
                    $logStmt = $con->prepare("INSERT INTO marketing_campaigns_log (passenger_id, message_type, country_code, region_name, triggered_by) VALUES (?, 'push', ?, ?, 'autopilot')");
                    $logStmt->execute([$passengerId, $countryCode, $regionName]);
                    $dispatchedPassengers[] = $passengerId;
                    $pushSent = true;
                }
            }
        }
        
        if (!$pushSent) {
            // Fallback: Churned user (No token) OR Push failed -> Send WhatsApp or SMS
            // Check anti-spam first to prevent unnecessary marketing cost
            if ($spamCount === 0) {
                // Fetch and decrypt passenger phone number
                $sqlUser = "SELECT phone FROM passengers WHERE id = :pid LIMIT 1";
                $stmtUser = $con->prepare($sqlUser);
                $stmtUser->execute([':pid' => $passengerId]);
                $encPhone = $stmtUser->fetchColumn();

                if ($encPhone) {
                    $decryptedPhone = $encryptionHelper->decryptData($encPhone);
                    if ($decryptedPhone) {
                        // Send WhatsApp (or fallback to SMS simulation)
                        $waResult = sendWhatsAppFromServer($decryptedPhone, $smsBody);
                        
                        if ($waResult && ($waResult['status'] ?? '') === 'success') {
                            $sentWhatsApp++;
                            $logStmt = $con->prepare("INSERT INTO marketing_campaigns_log (passenger_id, message_type, country_code, region_name, triggered_by) VALUES (?, 'whatsapp', ?, ?, 'autopilot')");
                            $logStmt->execute([$passengerId, $countryCode, $regionName]);
                            $dispatchedPassengers[] = $passengerId;
                        } else {
                            // Fallback to SMS simulation
                            $sentSms++;
                            $logStmt = $con->prepare("INSERT INTO marketing_campaigns_log (passenger_id, message_type, country_code, region_name, triggered_by) VALUES (?, 'sms', ?, ?, 'autopilot')");
                            $logStmt->execute([$passengerId, $countryCode, $regionName]);
                            $dispatchedPassengers[] = $passengerId;
                        }
                    }
                }
            }
        }
    }

    // Log the audit event for Admin action
    logAudit(
        $con, 
        $user_id ?? 'admin_system', 
        'trigger_marketing_campaign', 
        'promos', 
        $promoCode, 
        ['promo_code' => $promoCode, 'targets_count' => count($dispatchedPassengers)]
    );

    jsonSuccess([
        'campaign_created' => true,
        'promo_code' => $promoCode,
        'discount_percentage' => $discountVal,
        'push_notification' => [
            'title' => $pushTitle,
            'body' => $pushBody,
            'sent_count' => $sentFcm
        ],
        'whatsapp_sms' => [
            'body' => $smsBody,
            'whatsapp_sent_count' => $sentWhatsApp,
            'sms_sent_count' => $sentSms
        ],
        'total_dispatched' => count($dispatchedPassengers),
        'debug_info' => [
            'requested_country' => $countryCode,
            'total_passengers_in_db' => count($allPassengers),
            'matched_targets' => count($targets),
            'distribution' => $debugCounts
        ]
    ]);

} catch (Exception $e) {
    error_log("[trigger_campaign.php] Error: " . $e->getMessage());
    jsonError("Failed to trigger marketing campaign: " . $e->getMessage());
}