<?php

/**
 * Plugin: image-usage-indicator
 *
 * Exposes an API route that scans all content files for file:// UUID references,
 * and returns which images (by filename) are actually used on a given page.
 *
 * Used by index.js to add visual badges in the panel files section.
 */

Kirby::plugin('smart-forests/image-usage-indicator', [
    'api' => [
        'routes' => [
            [
                'pattern' => 'smart-forests/image-usage/(:any)',
                'method'  => 'GET',
                'action'  => function (string $encodedId) {
                    $kirby  = kirby();

                    // Panel encodes page IDs with + instead of /
                    $pageId = str_replace('+', '/', rawurldecode($encodedId));
                    $page   = $kirby->page($pageId);

                    if (!$page) {
                        return ['error' => 'Page not found: ' . $pageId];
                    }

                    // Build UUID → filename map for all files on this page
                    $uuidMap = [];
                    foreach ($page->files() as $file) {
                        $uuid = $file->content()->get('uuid')->value();
                        if ($uuid) {
                            $uuidMap[$uuid] = $file->filename();
                        }
                    }

                    if (empty($uuidMap)) {
                        return (object)[];
                    }

                    // Scan all content .txt files once for file:// UUID references
                    $usedUuids   = [];
                    $contentRoot = $kirby->root('content');
                    $iter = new RecursiveIteratorIterator(
                        new RecursiveDirectoryIterator(
                            $contentRoot,
                            RecursiveDirectoryIterator::SKIP_DOTS
                        )
                    );

                    foreach ($iter as $fsFile) {
                        // Stop early when all UUIDs are accounted for
                        if (count($usedUuids) === count($uuidMap)) {
                            break;
                        }

                        if ($fsFile->getExtension() !== 'txt') {
                            continue;
                        }

                        $content = file_get_contents($fsFile->getPathname());

                        foreach ($uuidMap as $uuid => $_) {
                            if (!isset($usedUuids[$uuid]) && strpos($content, 'file://' . $uuid) !== false) {
                                $usedUuids[$uuid] = true;
                            }
                        }
                    }

                    // Return filename => isUsed boolean
                    $result = [];
                    foreach ($uuidMap as $uuid => $filename) {
                        $result[$filename] = isset($usedUuids[$uuid]);
                    }

                    return $result;
                }
            ]
        ]
    ]
]);