// events.js — wires up DOM listeners. Idempotent so app.js can call
// init() once on load.
(function () {
    'use strict';

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

    function status(msg, kind) {
        var el = document.getElementById('statusBar');
        if (!el) return;
        el.textContent = msg || '';
        el.classList.remove('status-bar--error', 'status-bar--info');
        if (kind === 'error') el.classList.add('status-bar--error');
        if (kind === 'info')  el.classList.add('status-bar--info');
    }

    function statusError(msg) { status(msg, 'error'); }
    function statusInfo(msg)  { status(msg, 'info'); }
    function statusClear()    { status('', null); }

    async function pickLocalDir() {
        if (typeof window.showDirectoryPicker !== 'function') {
            statusError('Your browser does not support local folder selection. Use a recent Chromium-based browser, or open this page via zddc-server.');
            return;
        }
        var handle;
        try {
            handle = await window.showDirectoryPicker({ mode: 'read' });
        } catch (e) {
            // User cancelled — silent
            return;
        }
        state.source = 'fs';
        state.rootHandle = handle;
        state.currentPath = handle.name + '/';
        var raw;
        try {
            raw = await loader.fetchFsChildren(handle);
        } catch (e) {
            statusError('Failed to read directory: ' + e.message);
            return;
        }
        tree.setRoot(raw);
        showBrowseRoot();
        document.getElementById('currentPath').textContent = state.currentPath;
        tree.render();
        statusInfo('Loaded ' + raw.length + ' item' + (raw.length === 1 ? '' : 's'));
    }

    function showBrowseRoot() {
        var empty = document.getElementById('emptyState');
        var root = document.getElementById('browseRoot');
        if (empty) empty.classList.add('hidden');
        if (root) root.classList.remove('hidden');
    }

    function init() {
        // Header buttons
        var btn = document.getElementById('addDirectoryBtn');
        if (btn) btn.addEventListener('click', pickLocalDir);

        // Filter input
        var filter = document.getElementById('filterInput');
        if (filter) {
            filter.addEventListener('input', function () {
                tree.setFilter(filter.value);
            });
        }

        // Sort headers
        var ths = document.querySelectorAll('#browseTable thead th.sortable');
        for (var i = 0; i < ths.length; i++) {
            (function (th) {
                th.addEventListener('click', function () {
                    tree.setSort(th.dataset.sort);
                });
            })(ths[i]);
        }

        // Tree-row clicks (event delegation on tbody).
        // Click semantics on a folder row:
        //   - plain click  → toggle just this folder
        //   - shift-click  → recursive expand/collapse of the whole
        //                    subtree (matches common file-explorer
        //                    convention; e.g. Finder, VSCode tree,
        //                    Windows Explorer)
        //   - alt-click    → ALSO recursive (alt is sometimes the
        //                    expand-all key on Linux DEs; bind both
        //                    so muscle memory works either way)
        // File rows: let the <a> tag's natural target=_blank do its
        // job — don't intercept.
        var tbody = document.getElementById('browseTbody');
        if (tbody) {
            tbody.addEventListener('click', function (e) {
                var row = e.target.closest('tr.tree-row');
                if (!row) return;
                var isDir = row.dataset.isdir === 'true';
                if (!isDir) return;
                e.preventDefault();
                var id = parseInt(row.dataset.id, 10);
                if (e.shiftKey || e.altKey) {
                    var node = state.nodes.get(id);
                    if (node && node.expanded) {
                        tree.collapseSubtree(id);
                    } else {
                        tree.expandSubtree(id);
                    }
                } else {
                    tree.toggleFolder(id);
                }
            });
        }
    }

    // Public API
    window.app.modules.events = {
        init: init,
        statusError: statusError,
        statusInfo: statusInfo,
        statusClear: statusClear,
        showBrowseRoot: showBrowseRoot
    };
})();