<?php
// Opus 19avr v5.3: L99 honest cache-based endpoint
header('Content-Type: application/json');

$cache = '/tmp/l99-honest-cache.json';
$lock = '/tmp/l99-honest.lock';

// If cache exists and age < 20min, return it
if (file_exists($cache)) {
    $age = time() - filemtime($cache);
    $data = @json_decode(file_get_contents($cache), true);
    if ($data && $age < 1200) {
        $data['cache_age_sec'] = $age;
        echo json_encode($data, JSON_PRETTY_PRINT);
        exit;
    }
}

// Trigger async refresh if not already running
if (!file_exists($lock) || (time() - filemtime($lock)) > 300) {
    @file_put_contents($lock, (string)time());
    @exec('nohup /var/www/html/api/handlers/l99-honest-refresh.sh > /dev/null 2>&1 &');
}

// Return stale cache if exists, or "computing" status
if (file_exists($cache)) {
    $data = @json_decode(file_get_contents($cache), true);
    $data['cache_age_sec'] = time() - filemtime($cache);
    $data['status'] = 'stale_cache_refreshing';
    echo json_encode($data, JSON_PRETTY_PRINT);
} else {
    echo json_encode([
        'ok' => false,
        'status' => 'computing_first_run',
        'check_in_sec' => 90,
        'message' => 'First run computing, wait ~90s and retry'
    ]);
}