<?php
/**
 * get_market_share_analytics.php
 * جلب بيانات الحصة السوقية التاريخية لعرضها كرسوم بيانية للإدارة
 */

require_once __DIR__ . '/../../connect.php';

if ($role !== 'admin' && $role !== 'super_admin') {
    http_response_code(403);
    echo json_encode(['status' => 'failure', 'message' => 'Unauthorized']);
    exit;
}

try {
    $countryCode = resolveAdminCountry(filterRequest('country_code'), $role, $admin_country ?? null);
    
    if (!$countryCode) {
        jsonError("Missing required parameter: country_code");
        exit;
    }

    // Fetch up to 12 weeks of historical market health reports
    $sql = "SELECT report_date, average_pci, market_share_percent, total_anomalies, total_surge_opportunities 
            FROM market_health_reports 
            WHERE country_code = :country 
            ORDER BY report_date ASC 
            LIMIT 12";

    $stmt = $con->prepare($sql);
    $stmt->execute([':country' => strtoupper($countryCode)]);
    $reports = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // If no reports exist yet, we can simulate or return empty.
    // For now, we return exactly what is in the DB.
    $chartData = [];
    foreach ($reports as $row) {
        $chartData[] = [
            'date' => $row['report_date'],
            'pci' => (float)$row['average_pci'],
            'market_share' => (float)$row['market_share_percent'],
            'anomalies' => (int)$row['total_anomalies'],
            'surges' => (int)$row['total_surge_opportunities']
        ];
    }

    jsonSuccess([
        'status' => 'success',
        'historical_data' => $chartData
    ]);

} catch (Exception $e) {
    error_log("[get_market_share_analytics] Error: " . $e->getMessage());
    jsonError("Failed to fetch analytics");
}