<?php
/**
 * dashboard_data.php
 * API موحّد للداشبورد التحليلي — يقرأ من ملفات JSON المؤرشفة + بيانات حيّة من Redis.
 *
 * Parameters:
 *   date    (optional) — YYYY-MM-DD, default: today
 *   section (optional) — realtime|gap|heatmap|pricing|revenue|growth|market|complaints|funnel|hourly|weekly|zones|retention|all
 *                        default: all
 */

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

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

$requestedDate = filterRequest('date') ?: date('Y-m-d');
$section = filterRequest('section') ?: 'all';

if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $requestedDate)) {
    http_response_code(400);
    echo json_encode(['status' => 'error', 'message' => 'Invalid date format']);
    exit;
}

$cacheBase = __DIR__ . '/../../../cache/analytics';
$dayDir = "$cacheBase/$requestedDate";

$response = [
    'status' => 'success',
    'date' => $requestedDate,
    'section' => $section,
    'data' => [],
];

function loadSnapshot(string $dir, string $name): ?array {
    $path = "$dir/$name.json";
    if (!file_exists($path)) return null;
    $data = json_decode(file_get_contents($path), true);
    return is_array($data) ? $data : null;
}

function loadLatestRealtime(string $dir): ?array {
    $files = glob("$dir/realtime_*.json");
    if (empty($files)) return null;
    sort($files);
    $latest = end($files);
    $data = json_decode(file_get_contents($latest), true);
    return is_array($data) ? $data : null;
}

$sectionMap = [
    'realtime'   => fn() => loadLatestRealtime($dayDir),
    'gap'        => fn() => loadSnapshot($dayDir, 'supply_demand_gap'),
    'heatmap'    => fn() => loadSnapshot($dayDir, 'heatmap'),
    'pricing'    => fn() => loadSnapshot($dayDir, 'pricing_grids'),
    'demand'     => fn() => loadSnapshot($dayDir, 'predictive_demand'),
    'revenue'    => fn() => loadSnapshot($dayDir, 'revenue_30d'),
    'growth'     => fn() => loadSnapshot($dayDir, 'growth_30d'),
    'market'     => fn() => loadSnapshot($dayDir, 'market_health'),
    'complaints' => fn() => loadSnapshot($dayDir, 'complaints_open'),
    'funnel'     => fn() => loadSnapshot($dayDir, 'ride_funnel'),
    'hourly'     => fn() => loadSnapshot($dayDir, 'hourly_pattern'),
    'weekly'     => fn() => loadSnapshot($dayDir, 'weekly_comparison'),
    'zones'      => fn() => loadSnapshot($dayDir, 'top_zones'),
    'retention'  => fn() => loadSnapshot($dayDir, 'retention_cohort'),
    'competitor'  => fn() => loadSnapshot($dayDir, 'competitor_prices_24h'),
];

try {
    if (!is_dir($dayDir)) {
        $response['data'] = null;
        $response['note'] = "No snapshot data for $requestedDate";

        $indexPath = "$cacheBase/index.json";
        if (file_exists($indexPath)) {
            $idx = json_decode(file_get_contents($indexPath), true);
            $response['available_dates'] = $idx['available_dates'] ?? [];
        }

        echo json_encode($response, JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($section === 'all') {
        foreach ($sectionMap as $key => $loader) {
            $result = $loader();
            if ($result !== null) {
                $response['data'][$key] = $result;
            }
        }
    } elseif (isset($sectionMap[$section])) {
        $response['data'] = $sectionMap[$section]();
    } else {
        http_response_code(400);
        echo json_encode([
            'status' => 'error',
            'message' => "Unknown section: $section",
            'available' => array_keys($sectionMap),
        ]);
        exit;
    }

    $indexPath = "$cacheBase/index.json";
    if (file_exists($indexPath)) {
        $idx = json_decode(file_get_contents($indexPath), true);
        $response['available_dates'] = $idx['available_dates'] ?? [];
    }

    echo json_encode($response, JSON_UNESCAPED_UNICODE);

} catch (Exception $e) {
    http_response_code(500);
    error_log("[dashboard_data.php] " . $e->getMessage());
    echo json_encode(['status' => 'error', 'message' => 'Internal error']);
}