<?php

/**

 * Public repository views. Included by index.php with $slug set, plus $view

 * (one of 'tree', 'blob', 'raw') and $path (the folder or file path within the

 * repo). Not meant to be requested directly.

 */

require_once __DIR__ . '/includes/db.php';

require_once __DIR__ . '/includes/helpers.php';

require_once __DIR__ . '/includes/tree.php';

require_once __DIR__ . '/includes/markdown.php';

require_once __DIR__ . '/includes/og.php';

require_once __DIR__ . '/api/highlight.php';

$slug = $slug ?? '';

$repo = get_repository_by_slug($slug);

if (!$repo) {

    render_404();

    return;

}

$view = $view ?? 'tree';

$path = $path ?? '';

if ($view === 'raw') {

    render_raw_file($repo, $path);

} elseif ($view === 'blob') {

    render_file_view($repo, $path);

} elseif ($view === 'archive') {

    render_archive($repo);

} else {

    render_tree_view($repo, $path);

}

/**

 * Share metadata for a repository page: [title, description, image, url].

 * Every page of a repo advertises the same generated card — the card describes

 * the repository, not the individual file being viewed.

 */

function repo_share_meta(array $repo, string $path = '', bool $isFile = false): array

{

    $title = $repo['name'] . ($path !== '' ? ' / ' . $path : '');

    $desc  = trim((string) ($repo['description'] ?? ''));

    if ($desc === '') {

        $lang = repo_language_display($repo);

        $desc = $lang !== ''

            ? $lang . ' repository on jefftml\'s code'

            : 'A repository on jefftml\'s code';

    }

    $url = $isFile ? blob_url($repo['slug'], $path) : tree_url($repo['slug'], $path);

    return [$title, $desc, repo_og_url($repo), site_origin() . $url];

}

/** Map a repository's free-text language label to a highlighter language. */

function highlight_lang_for(array $repo, string $filename): string

{

    $lang = language_from_filename($filename);

    if ($lang !== 'plain') {

        return $lang;

    }

    $label = strtolower((string) ($repo['language'] ?? ''));

    $map = ['php' => 'php', 'javascript' => 'javascript', 'js' => 'javascript',

            'python' => 'python', 'java' => 'java'];

    return $map[$label] ?? 'plain';

}

/** Resolve a repo-relative file to an absolute path, or null if it escapes. */

function resolve_repo_file(array $repo, string $filename): ?string

{

    $repoDir = realpath(UPLOAD_DIR . '/' . $repo['slug']);

    $full    = realpath(UPLOAD_DIR . '/' . $repo['slug'] . '/' . $filename);

    if ($repoDir === false || $full === false || strpos($full, $repoDir . DIRECTORY_SEPARATOR) !== 0) {

        return null;

    }

    return $full;

}

/** Breadcrumb trail for a folder or file path within a repo. */

function render_crumbs(array $repo, string $path): void

{

    $slug     = $repo['slug'];

    $segments = $path === '' ? [] : explode('/', $path);

    $last     = count($segments) - 1;

    ?>

    <nav class="crumbs">

        <a href="<?= e(url('/')) ?>">repositories</a> /

        <a href="<?= e(tree_url($slug)) ?>"><?= e($slug) ?></a><?php

        $accum = [];

        foreach ($segments as $idx => $seg) {

            $accum[] = $seg;

            echo ' / ';

            if ($idx === $last) {

                echo '<strong>' . e($seg) . '</strong>';

            } else {

                echo '<a href="' . e(tree_url($slug, implode('/', $accum))) . '">' . e($seg) . '</a>';

            }

        }

        // A file with no folder still needs its own crumb.

        ?>

    </nav>

    <?php

}

function render_tree_view(array $repo, string $folder): void

{

    $folder  = trim(safe_relpath($folder), '/');

    $files   = get_files_by_repo((int) $repo['id']);

    $folders = get_folders_by_repo((int) $repo['id']);

    // A non-root path must correspond to a real folder.

    if ($folder !== '' && !in_array($folder, array_column($folders, 'path'), true)) {

        render_404();

        return;

    }

    // Navigate the full tree down to the requested folder.

    $tree = build_file_tree($files, $folders);

    $node = $tree;

    foreach (explode('/', $folder) as $seg) {

        if ($seg === '') {

            continue;

        }

        $node = $node['dirs'][$seg] ?? ['dirs' => [], 'files' => []];

    }

    $page_title = $repo['name'] . ($folder !== '' ? ' / ' . $folder : '');

    [$og_title, $og_description, $og_image, $og_url] = repo_share_meta($repo, $folder);

    require __DIR__ . '/includes/header.php';

    render_crumbs($repo, $folder);

    ?>

    <?php

    // Repository language badge: manual override if set, else auto-detected

    // from the repo's files (which are already loaded above).

    $repoLang = trim((string) ($repo['language'] ?? ''));

    if ($repoLang === '') {

        $repoLang = detect_language($files);

    }

    ?>

    <div class="repo-head">

        <h1><?= e($folder !== '' ? basename($folder) : $repo['name']) ?>

            <?php if ($folder === '' && $repoLang !== ''): ?><span class="badge"><?= e($repoLang) ?></span><?php endif; ?>

        </h1>

        <?php if (!empty($files)): ?>

            <a class="btn-secondary btn-download-zip" href="<?= e(archive_url($repo['slug'])) ?>">

                <span class="dl-icon" aria-hidden="true">&#8615;</span> Download ZIP

            </a>

        <?php endif; ?>

    </div>

    <?php if ($folder === '' && !empty($repo['description'])): ?>

        <p class="repo-desc"><?= e($repo['description']) ?></p>

    <?php endif; ?>

    <?php if (empty($node['dirs']) && empty($node['files']) && $folder === ''): ?>

        <p class="empty">No files in this repository yet.</p>

    <?php else: ?>

        <div class="tree-listing">

            <?php if ($folder !== ''): ?>

                <?php $parent = trim(dirname($folder), '/.'); ?>

                <div class="tree-up">

                    <span class="tree-icon">&#128193;</span>

                    <a href="<?= e(tree_url($repo['slug'], $parent)) ?>">..</a>

                </div>

            <?php endif; ?>

            <?= render_tree_nodes($node, $repo, $folder) ?>

        </div>

    <?php endif; ?>

    <?php

    // README rendered on the repository root only (GitHub-style).

    if ($folder === '') {

        foreach ($node['files'] as $file) {

            if (strcasecmp($file['name'], 'README.md') === 0) {

                $full = resolve_repo_file($repo, $file['path']);

                if ($full !== null) {

                    $md = file_get_contents($full);

                    if ($md !== false && $md !== '') {

                        echo '<article class="readme"><div class="readme-head">'

                           . '<span class="tree-icon">&#128196;</span> ' . e($file['name'])

                           . '</div><div class="readme-body markdown">'

                           . markdown_to_html($md) . '</div></article>';

                    }

                }

                break;

            }

        }

    }

    require __DIR__ . '/includes/footer.php';

}

function render_file_view(array $repo, string $blob): void

{

    $filename = safe_relpath($blob);

    $record   = get_file_by_name((int) $repo['id'], $filename);

    if (!$record) {

        render_404();

        return;

    }

    $full = resolve_repo_file($repo, $filename);

    if ($full === null) {

        render_404();

        return;

    }

    $isImage    = is_image_file($filename);

    $isSvg      = is_svg_file($filename);

    $isModel    = is_model_file($filename);

    $modelFmt   = $isModel ? model_format($filename) : '';

    // A model file renders in the 3D viewer; only small, text-based model

    // formats (OBJ / ASCII PLY / G-code) also keep a readable "Source" view.

    $modelSourceOk = $isModel && is_text_model_format($modelFmt)

                     && (int) $record['filesize'] <= 2 * 1024 * 1024;

    $hasRendered = $isImage || $isModel;                 // has a non-source view

    $showSource  = $isSvg || $modelSourceOk || (!$isImage && !$isModel);

    $lines = [];

    $lang  = 'plain';

    if ($showSource) {

        $code = file_get_contents($full);

        if ($code === false) {

            $code = '';

        }

        $lang  = highlight_lang_for($repo, $filename);

        $lines = explode("\n", str_replace("\r\n", "\n", $code));

    }

    // Sidebar file tree for the whole repository.

    $allFiles   = get_files_by_repo((int) $repo['id']);

    $allFolders = get_folders_by_repo((int) $repo['id']);

    $sidebar    = render_tree_nodes(

        build_file_tree($allFiles, $allFolders),

        $repo,

        '',

        ['active' => $filename, 'open' => ancestor_dirs($filename)]

    );

    $page_title = $repo['name'] . ' / ' . $filename;

    [$og_title, $og_description, $og_image, $og_url] = repo_share_meta($repo, $filename, true);

    require __DIR__ . '/includes/header.php';

    render_crumbs($repo, $filename);

    ?>

    <div class="file-layout">

        <aside class="file-sidebar">

            <input type="search" id="tree-search" class="tree-search" placeholder="Search files…" aria-label="Search files">

            <div class="file-sidebar-tree"><?= $sidebar ?></div>

        </aside>

        <div class="file-main">

            <div class="file-toolbar">

                <div class="file-meta muted">

                    <?php if ($showSource): ?><?= count($lines) ?> lines &middot; <?php endif; ?><?= e(human_size((int) $record['filesize'])) ?>

                </div>

                <div class="file-actions">

                    <?php if ($hasRendered && $showSource): ?>

                        <button type="button" class="btn-secondary" id="view-rendered">Rendered</button>

                        <button type="button" class="btn-secondary" id="view-source">Source</button>

                    <?php endif; ?>

                    <?php if ($isImage): ?>

                        <button type="button" class="btn-secondary" id="toggle-bg">Dark background</button>

                    <?php endif; ?>

                    <a class="btn-secondary" href="<?= e(raw_url($repo['slug'], $filename)) ?>" target="_blank" rel="noopener">Raw</a>

                    <?php if ($showSource): ?>

                        <button type="button" class="btn-secondary" id="copy-code">Copy Code</button>

                    <?php endif; ?>

                    <a class="btn-secondary" href="<?= e(raw_url($repo['slug'], $filename, true)) ?>">Download</a>

                </div>

            </div>

            <?php if ($isImage): ?>

                <div class="image-view" id="image-view">

                    <img src="<?= e(raw_url($repo['slug'], $filename)) ?>" alt="<?= e(basename($filename)) ?>">

                </div>

            <?php endif; ?>

            <?php if ($isModel): ?>

                <div class="model-view" id="model-view"

                     data-src="<?= e(raw_url($repo['slug'], $filename)) ?>"

                     data-format="<?= e($modelFmt) ?>"

                     data-name="<?= e(basename($filename)) ?>"

                     data-download="<?= e(raw_url($repo['slug'], $filename, true)) ?>">

                    <div class="model-status">Loading 3D view…</div>

                </div>

            <?php endif; ?>

            <?php if ($showSource): ?>

                <div class="code-view<?= $hasRendered ? ' hidden' : '' ?>" id="code-view">

                    <table class="code">

                        <tbody>

                        <?php foreach ($lines as $i => $line): ?>

                            <tr>

                                <td class="ln"><?= $i + 1 ?></td>

                                <td class="cl"><pre><?= $line === '' ? '' : highlight_code($line, $lang) ?></pre></td>

                            </tr>

                        <?php endforeach; ?>

                        </tbody>

                    </table>

                </div>

            <?php endif; ?>

        </div>

    </div>

    <script>

    (function () {

        // File-tree search: hide non-matching files and collapse empty folders.

        var box = document.getElementById('tree-search');

        var root = document.querySelector('.file-sidebar-tree');

        if (box && root) {

            box.addEventListener('input', function () {

                var q = box.value.trim().toLowerCase();

                root.querySelectorAll('li.tree-file').forEach(function (li) {

                    var name = (li.textContent || '').toLowerCase();

                    li.style.display = (q === '' || name.indexOf(q) !== -1) ? '' : 'none';

                });

                root.querySelectorAll('li.tree-dir').forEach(function (li) {

                    var anyVisible = li.querySelector('li.tree-file:not([style*="display: none"])');

                    li.style.display = (q === '' || anyVisible) ? '' : 'none';

                    var det = li.querySelector('details');

                    if (det && q !== '') { det.open = !!anyVisible; }

                });

            });

        }

        // Rendered / source toggle (SVG images and text-based model files).

        var rBtn = document.getElementById('view-rendered');

        var sBtn = document.getElementById('view-source');

        var rendered = document.getElementById('image-view') || document.getElementById('model-view');

        var code = document.getElementById('code-view');

        if (rBtn && sBtn && rendered && code) {

            rBtn.addEventListener('click', function () { rendered.classList.remove('hidden'); code.classList.add('hidden'); });

            sBtn.addEventListener('click', function () { rendered.classList.add('hidden'); code.classList.remove('hidden'); });

        }

        // Light / dark checkered background toggle for transparent images.

        var bgBtn = document.getElementById('toggle-bg');

        var imageView = document.getElementById('image-view');

        if (bgBtn && imageView) {

            bgBtn.addEventListener('click', function () {

                var dark = imageView.classList.toggle('image-view-dark');

                bgBtn.textContent = dark ? 'Light background' : 'Dark background';

            });

        }

        // Copy the source to the clipboard (line-number cells are excluded).

        var copyBtn = document.getElementById('copy-code');

        if (copyBtn && code) {

            copyBtn.addEventListener('click', function () {

                var cells = code.querySelectorAll('td.cl pre');

                var text = Array.prototype.map.call(cells, function (c) { return c.textContent; }).join('\n');

                var done = function () {

                    copyBtn.textContent = 'Copied!';

                    setTimeout(function () { copyBtn.textContent = 'Copy Code'; }, 1500);

                };

                if (navigator.clipboard && navigator.clipboard.writeText) {

                    navigator.clipboard.writeText(text).then(done, function () {});

                } else {

                    var ta = document.createElement('textarea');

                    ta.value = text;

                    ta.style.position = 'fixed';

                    ta.style.opacity = '0';

                    document.body.appendChild(ta);

                    ta.select();

                    try { document.execCommand('copy'); done(); } catch (e) {}

                    document.body.removeChild(ta);

                }

            });

        }

    })();

    </script>

    <?php if ($isModel): ?>

    <script src="<?= e(url('/assets/model-viewer.js')) ?>" defer></script>

    <?php endif; ?>

    <?php

    require __DIR__ . '/includes/footer.php';

}

/** Stream a stored file's raw bytes, optionally as a download attachment. */

function render_raw_file(array $repo, string $blob): void

{

    $filename = safe_relpath($blob);

    $record   = get_file_by_name((int) $repo['id'], $filename);

    if (!$record) {

        render_404();

        return;

    }

    $full = resolve_repo_file($repo, $filename);

    if ($full === null) {

        render_404();

        return;

    }

    $download = isset($_GET['dl']);

    header('Content-Type: ' . mime_for_filename($filename));

    header('X-Content-Type-Options: nosniff');

    header('Content-Length: ' . filesize($full));

    if ($download) {

        header('Content-Disposition: attachment; filename="' . basename($filename) . '"');

    }

    readfile($full);

}

/**

 * Build a .zip of every file in the repository and stream it as a download,

 * GitHub-style. All contents are nested under a top-level "<slug>/" folder so

 * the archive expands into a single tidy directory.

 */

function render_archive(array $repo): void

{

    if (!class_exists('ZipArchive')) {

        archive_error(500, 'Zip archives are unavailable on this server (the PHP zip extension is not installed).');

        return;

    }

    $files = get_files_by_repo((int) $repo['id']);

    if (empty($files)) {

        render_404();

        return;

    }

    // ZipArchive writes to a real file, so build it in a temp file, stream it,

    // then remove it. Building incrementally keeps memory use flat.

    $tmp = tempnam(sys_get_temp_dir(), 'repozip_');

    if ($tmp === false) {

        archive_error(500, 'Unable to create the archive.');

        return;

    }

    $zip = new ZipArchive();

    if ($zip->open($tmp, ZipArchive::OVERWRITE) !== true) {

        @unlink($tmp);

        archive_error(500, 'Unable to create the archive.');

        return;

    }

    $root  = $repo['slug'];                 // top-level folder inside the zip

    $added = 0;

    // Preserve empty folders (they exist as folder rows but hold no files).

    foreach (get_folders_by_repo((int) $repo['id']) as $folder) {

        $zip->addEmptyDir($root . '/' . $folder['path']);

    }

    foreach ($files as $file) {

        $full = resolve_repo_file($repo, $file['filename']);

        if ($full === null || !is_file($full)) {

            continue;               // skip records whose file is missing on disk

        }

        if ($zip->addFile($full, $root . '/' . $file['filename'])) {

            $added++;

        }

    }

    $zip->close();

    if ($added === 0) {

        @unlink($tmp);

        render_404();

        return;

    }

    $size = filesize($tmp);

    header('Content-Type: application/zip');

    header('Content-Disposition: attachment; filename="' . $repo['slug'] . '.zip"');

    header('X-Content-Type-Options: nosniff');

    if ($size !== false) {

        header('Content-Length: ' . $size);

    }

    readfile($tmp);

    @unlink($tmp);

}

/** Emit a plain-text error for the archive endpoint (no HTML chrome yet sent). */

function archive_error(int $code, string $message): void

{

    http_response_code($code);

    header('Content-Type: text/plain; charset=utf-8');

    echo $message;

}