// app.js — bootstrap. Runs after every other module's IIFE has
// registered its functions on window.app.modules.
(function () {
    'use strict';

    var state = window.app.state;
    var loader = window.app.modules.loader;
    var tree = window.app.modules.tree;
    var events = window.app.modules.events;

    // Canonical folders that should appear at the root of a project
     // view even if they don't yet exist on disk. Matches the four
     // stage cards on the project landing page. zddc-server returns an
     // empty listing for these paths (see commit 3fc3717), so
     // navigating into a virtual folder works without 404.
    var CANONICAL_PROJECT_FOLDERS = ['archive', 'working', 'staging', 'reviewing'];

    // Decide whether `path` looks like a project root — i.e. exactly
    // one path segment after the leading slash. /Project-1/ → yes;
    // / → no; /Project-1/working/ → no.
    function isProjectRoot(path) {
        if (!path || path === '/') return false;
        var trimmed = path.replace(/^\/+|\/+$/g, '');
        if (!trimmed) return false;
        return trimmed.indexOf('/') < 0;
    }

    // Merge virtual entries for any canonical folders absent from the
    // server's listing. Each virtual entry is shaped like a normal
    // directory entry so the tree renderer treats it the same way.
    function withVirtualCanonicals(entries, path) {
        if (!isProjectRoot(path)) return entries;
        var present = Object.create(null);
        entries.forEach(function (e) { if (e.isDir) present[e.name] = true; });
        var augmented = entries.slice();
        CANONICAL_PROJECT_FOLDERS.forEach(function (name) {
            if (!present[name]) {
                augmented.push({
                    name: name,
                    isDir: true,
                    size: 0,
                    modTime: null,
                    ext: '',
                    url: path.replace(/\/$/, '') + '/' + name + '/',
                    virtual: true
                });
            }
        });
        return augmented;
    }

    // Expose for events.js's client-side rescope on dblclick.
    window.app.modules.augmentRoot = withVirtualCanonicals;

    async function bootstrap() {
        events.init();

        // Try server auto-detect. If this page is served by zddc-server
        // (or any server with a Caddy-shaped JSON listing), load the
        // current directory automatically. Otherwise show the empty
        // state with the "Select Directory" button.
        var detected = await loader.autoDetectServerMode();
        if (detected) {
            var entries = withVirtualCanonicals(detected.entries, detected.path);
            tree.setRoot(entries);
            events.showBrowseRoot();
            tree.render();
            events.statusInfo('Loaded ' + detected.entries.length + ' item'
                + (detected.entries.length === 1 ? '' : 's')
                + ' from ' + detected.path);
        }
        // Else: empty state stays visible; user can click Select Directory.

        // Browser back / forward: client-side rescope when the URL
        // changes via popstate. We can't tell server-vs-fs mode from
        // popstate alone, so only honor it in server mode.
        window.addEventListener('popstate', async function () {
            if (window.app.state.source !== 'server') return;
            var path = location.pathname;
            if (!path.endsWith('/')) path += '/';
            try {
                var es = await loader.fetchServerChildren(path);
                window.app.state.currentPath = path;
                window.app.state.selectedId = null;
                window.app.state.lastPreviewedNodeId = null;
                tree.setRoot(withVirtualCanonicals(es, path));
                tree.render();
                var previewBody = document.getElementById('previewBody');
                if (previewBody) previewBody.innerHTML = '';
                var previewTitle = document.getElementById('previewTitle');
                if (previewTitle) previewTitle.textContent = 'No file selected';
            } catch (_e) { /* swallow — leave the tree as-is */ }
        });
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', bootstrap);
    } else {
        bootstrap();
    }
})();