<?php
// /var/www/html/api/screens-thumbnails.php
// Maps carto URLs to available L99 screenshots. Zero-regression, read-only.
// Returns: {"by_url": {url: "/l99-screenshots/xxx.png", ...}, "total_available": N}
header("Content-Type: application/json; charset=utf-8");
header("Access-Control-Allow-Origin: *");
header("Cache-Control: public, max-age=60");

$L99_DIR = "/opt/weval-l99/screenshots";
$WEB_BASE = "/l99-screenshots";

if (!is_dir($L99_DIR)) {
    http_response_code(503);
    echo json_encode(["error" => "l99_screenshots_dir_missing"]);
    exit;
}

// Load all available screenshots once
$files = @scandir($L99_DIR) ?: [];
$available = [];
foreach ($files as $f) {
    if (preg_match('/\.(png|jpg|jpeg|webp)$/i', $f)) {
        // Normalize: strip prefixes (alive-, prod-, sso-, v01-, v02-, v03-, app-) and suffix (extension)
        $base = preg_replace('/\.(png|jpg|jpeg|webp)$/i', '', $f);
        $norm = preg_replace('/^(alive|prod|sso|app|v0[0-9]|resp|test|ux)-/', '', $base);
        $norm = strtolower($norm);
        // Store both exact and normalized
        $available[strtolower($base)] = $f;
        if ($norm !== strtolower($base)) {
            $available[$norm] = $f;
        }
    }
}

// Read carto DATA to match
$carto = @file_get_contents("/var/www/html/cartographie-screens.html") ?: "";
$mapping = [];
if (preg_match('/const DATA = (\[.*?\]);/s', $carto, $m)) {
    $data = json_decode($m[1], true) ?: [];
    foreach ($data as $entry) {
        $url = $entry["url"] ?? "";
        $name = $entry["name"] ?? "";
        if (!$url || !$name) continue;
        // Normalize name: strip .html/.php, lowercase
        $key = strtolower(preg_replace('/\.(html|php)$/i', '', $name));
        // Try multiple match strategies
        $found = null;
        if (isset($available[$key])) {
            $found = $available[$key];
        } elseif (isset($available[$key . "_html"])) {
            $found = $available[$key . "_html"];
        } else {
            // Fuzzy: find any filename containing the key as substring
            foreach ($available as $norm => $file) {
                if (strpos($norm, $key) !== false && strlen($key) > 3) {
                    $found = $file;
                    break;
                }
            }
        }
        if ($found) {
            $mapping[$url] = $WEB_BASE . "/" . $found;
        }
    }
}

echo json_encode([
    "generated_at" => date("c"),
    "total_screenshots_available" => count(array_unique($available)),
    "total_urls_matched" => count($mapping),
    "by_url" => $mapping
], JSON_UNESCAPED_SLASHES);