<?php
/**
 * auto_adapt.php
 * Auto-Adaptive Pricing — تعديل أسعار kazan الأساسية تلقائياً
 * 
 * المعادلة: سعر_الكيلو_الجديد = أقل_متوسط_سعر_منافس × 0.92
 * الحماية: ما ينزل عن 85% من السعر الحالي ولا يزيد عن 115%
 * 
 * التشغيل: cron job كل 30-60 دقيقة
 * CLI: php backend/ride/pricing/auto_adapt.php
 * HTTP: curl -X POST https://.../backend/ride/pricing/auto_adapt.php -H "X-Internal-Key: ..."
 */

require_once __DIR__ . '/../../core/bootstrap.php';

try {
    $con = Database::get('main');
} catch (Exception $e) {
    error_log("[AutoAdapt] DB connection failed: " . $e->getMessage());
    exit(1);
}

$countries = [
    'Syria'  => 'SY',
    'Jordan' => 'JO',
    'Egypt'  => 'EG',
    'Iraq'   => 'IQ'
];

$undercutFactor  = 0.92;
$minFloorRatio   = 0.85;
$maxCeilRatio    = 1.15;

$kmColumns = [
    'speedPrice', 'comfortPrice', 'ladyPrice', 'electricPrice',
    'vanPrice', 'deliveryPrice', 'mishwarVipPrice', 'fixedPrice', 'awfarPrice'
];

$logEntries = [];

foreach ($countries as $country => $cc) {
    // 1. متوسط سعر الكيلو لكل منافس (آخر 24 ساعة)
    $sql = "SELECT competitor_name, AVG(price_per_km) AS avg_ppm
            FROM competitor_prices
            WHERE country_code = :cc
              AND created_at >= DATE_SUB(NOW(), INTERVAL 24 HOUR)
              AND price_per_km > 0
            GROUP BY competitor_name
            ORDER BY avg_ppm ASC";
    $stmt = $con->prepare($sql);
    $stmt->execute([':cc' => $cc]);
    $competitorAvgs = $stmt->fetchAll(PDO::FETCH_ASSOC);

    if (empty($competitorAvgs)) {
        error_log("[AutoAdapt] $country — لا توجد بيانات منافسين");
        continue;
    }

    $lowestAvg  = (float)$competitorAvgs[0]['avg_ppm'];

    // 2. الأسعار الحالية من kazan
    $kazanSql = "SELECT * FROM kazan WHERE country = :country LIMIT 1";
    $stmtK = $con->prepare($kazanSql);
    $stmtK->execute([':country' => $country]);
    $kazanRow = $stmtK->fetch(PDO::FETCH_ASSOC);

    if (!$kazanRow) {
        error_log("[AutoAdapt] $country — لا يوجد صف في kazan");
        continue;
    }

    $currentSpeed = (float)$kazanRow['speedPrice'];
    $targetSpeed  = $lowestAvg * $undercutFactor;

    $minAllowed = $currentSpeed * $minFloorRatio;
    $maxAllowed = $currentSpeed * $maxCeilRatio;

    if ($targetSpeed < $minAllowed) {
        $targetSpeed = $minAllowed;
    } elseif ($targetSpeed > $maxAllowed) {
        $targetSpeed = $maxAllowed;
    }

    $ratio = $targetSpeed / $currentSpeed;

    $updates = [];
    $params  = [':country' => $country];

    foreach ($kmColumns as $col) {
        $oldVal = (float)($kazanRow[$col] ?? 0);
        if ($oldVal > 0) {
            $newVal = round($oldVal * $ratio, 2);
            $updates[] = "`$col` = :$col";
            $params[":$col"] = (string)$newVal;
        }
    }

    if (empty($updates)) {
        continue;
    }

    $updateSql = "UPDATE kazan SET " . implode(', ', $updates) . " WHERE country = :country";
    $stmtU = $con->prepare($updateSql);
    $stmtU->execute($params);

    $logEntries[] = [
        'country'       => $country,
        'code'          => $cc,
        'old_speed'     => $currentSpeed,
        'new_speed'     => $targetSpeed,
        'lowest_competitor' => $lowestAvg,
        'ratio'         => round($ratio, 4),
    ];

    error_log("[AutoAdapt] ✅ $country ($cc): speedPrice $currentSpeed → $targetSpeed (ratio: $ratio)");
}

if (php_sapi_name() === 'cli') {
    echo json_encode(['status' => 'success', 'updates' => $logEntries], JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
} else {
    echo json_encode(['status' => 'success', 'updates' => $logEntries]);
}