// mdl-from-archive.js — "Add from archive" for the project MDL rollup.
//
// The MDL owns the workflow of registering deliverables; this is the catch-up
// path. On the project rollup (<project>/mdl/), walk the project archive into a
// shared seltable (autofilter + ctrl-shift selection), dedupe the selection to
// one deliverable per tracking number, and PUT a deliverable .yaml into each
// originator's archive/<originator>/mdl/. The body's identity fields are split
// from the tracking number positionally per the project's own table columns
// (originator is folder-pinned, so omitted); the server composes/validates the
// filename. Server-only.
(function (app) {
    'use strict';

    function T(m, l, o) { if (window.zddc && window.zddc.toast) window.zddc.toast(m, l, o); }
    function el(tag, cls, text) { var e = document.createElement(tag); if (cls) e.className = cls; if (text != null) e.textContent = text; return e; }
    function ctxObj() { return (app && app.context) || {}; }

    // The tracking-number identity fields, in order, from the table columns:
    // everything between `originator` and `title` (e.g. phase, project, area,
    // discipline, type, sequence, suffix). originator is folder-pinned.
    function identityFields() {
        var cols = (ctxObj().columns || []).map(function (c) { return c && c.field; }).filter(Boolean);
        var oi = cols.indexOf('originator'), ti = cols.indexOf('title');
        return cols.slice(oi >= 0 ? oi + 1 : 0, ti >= 0 ? ti : cols.length);
    }
    // tracking → { tracking, originator, body{identity fields + title} }, or null
    // if it can't supply the originator + at least one identity segment.
    function deliverableFromFile(f, idFields) {
        var segs = String(f.tracking || '').split('-');
        if (segs.length < 2) return null;
        var rest = segs.slice(1), body = {};
        idFields.forEach(function (name, i) { if (rest[i] != null && rest[i] !== '') body[name] = rest[i]; });
        if (!Object.keys(body).length) return null;
        body.title = f.title || '';
        return { tracking: f.tracking, originator: segs[0], body: body };
    }
    function dedupe(files, idFields) {
        var seen = Object.create(null), out = [];
        (files || []).forEach(function (f) {
            if (seen[f.tracking]) return;
            var d = deliverableFromFile(f, idFields);
            if (d) { seen[f.tracking] = true; out.push(d); }
        });
        return out;
    }

    async function walkArchive(rootHandle) {
        var out = [];
        async function walk(dirH, parts) {
            for await (var entry of dirH.values()) {
                var nm = String(entry.name || '').replace(/\/$/, '');
                if (entry.kind === 'directory') {
                    var c = nm.charAt(0);
                    if (c === '.' || c === '_' || nm === 'mdl' || nm === 'rsk') continue;
                    await walk(await dirH.getDirectoryHandle(nm), parts.concat(nm));
                } else {
                    var p = window.zddc.parseFilename(nm);
                    if (p && p.valid && p.trackingNumber) {
                        out.push({
                            id: parts.concat(nm).join('/'),
                            party: parts[0] || '', slot: parts[1] || '', transmittal: parts[2] || '',
                            tracking: p.trackingNumber, revision: p.revision, status: p.status, title: p.title,
                        });
                    }
                }
            }
        }
        await walk(rootHandle, []);
        return out;
    }
    async function instantiateOne(archiveRoot, d) {
        var dir = await archiveRoot.getDirectoryHandle(d.originator, { create: true });
        dir = await dir.getDirectoryHandle('mdl', { create: true });
        var fname = d.tracking + '.yaml';
        try { await dir.getFileHandle(fname); return 'skipped'; } catch (e) { /* NotFound → create */ }
        var fh = await dir.getFileHandle(fname, { create: true });
        var w = await fh.createWritable();
        await w.write(new Blob([window.jsyaml.dump(d.body)], { type: 'application/yaml' }));
        await w.close();
        return 'created';
    }

    // ── UI ───────────────────────────────────────────────────────────────────
    var overlay = null, statusEl = null, table = null, files = [], archiveRoot = null;
    function close() { if (overlay) { overlay.remove(); overlay = null; table = null; } }
    function setStatus(t) { if (statusEl) statusEl.textContent = t; }

    function archiveBaseUrl() {
        var proj = (location.pathname || '/').replace(/\/mdl\/.*$/, '/');   // <project>/
        return location.origin + proj + 'archive/';
    }
    async function open() {
        var src = window.zddc && window.zddc.source;
        if (!src || (location.protocol !== 'http:' && location.protocol !== 'https:')) {
            T('Adding from the archive needs the tables page served by a zddc-server.', 'error'); return;
        }
        buildOverlay();
        try {
            archiveRoot = new src.HttpDirectoryHandle(archiveBaseUrl(), 'archive');
            setStatus('Scanning archive…');
            files = await walkArchive(archiveRoot);
            table.renderBody();
            setStatus(files.length + ' document file' + (files.length === 1 ? '' : 's') + ' found. Filter + ctrl-shift select, then “Create deliverables”.');
        } catch (e) { setStatus('Archive scan failed — ' + (e.message || e)); T('Archive scan failed — ' + (e.message || e), 'error'); }
    }
    function buildOverlay() {
        close();
        overlay = el('div', 'mdlarch-overlay');
        var box = el('div', 'mdlarch-overlay__box');
        var head = el('div', 'mdlarch-overlay__head');
        head.appendChild(el('h2', null, 'Add deliverables from archive'));
        var x = el('button', 'mdlarch-overlay__close', '×'); x.title = 'Close'; x.addEventListener('click', close);
        head.appendChild(x); box.appendChild(head);
        statusEl = el('div', 'mdlarch-overlay__status', 'Scanning archive…'); box.appendChild(statusEl);
        var host = el('div', 'mdlarch-overlay__table'); box.appendChild(host);
        var foot = el('div', 'mdlarch-overlay__foot');
        var create = el('button', 'btn btn-primary', 'Create deliverables');
        create.addEventListener('click', function () { runCreate(create); });
        var cancel = el('button', 'btn btn-secondary', 'Close'); cancel.addEventListener('click', close);
        foot.appendChild(create); foot.appendChild(cancel); box.appendChild(foot);
        overlay.appendChild(box); document.body.appendChild(overlay);

        table = window.app.modules.seltable.create({
            container: host,
            extraTitle: '',
            rows: function () { return files; },
            rowId: function (r) { return r.id; },
            columns: [
                { key: 'party', title: 'Party' },
                { key: 'slot', title: 'Slot' },
                { key: 'transmittal', title: 'Transmittal' },
                { key: 'tracking', title: 'Tracking number' },
                { key: 'revision', title: 'Rev', get: function (r) { return r.revision + (r.status ? ' (' + r.status + ')' : ''); } },
                { key: 'title', title: 'Title' },
            ],
        });
        table.render();
    }
    async function runCreate(btn) {
        if (!table) return;
        var sel = table.getSelection();
        if (!sel.length) { T('Select some archive files first (filter + ctrl-shift).', 'warning'); return; }
        var picked = {}; sel.forEach(function (i) { picked[i] = true; });
        var deliverables = dedupe(files.filter(function (f) { return picked[f.id]; }), identityFields());
        if (!deliverables.length) { T('None of the selected files split into deliverable fields.', 'warning'); return; }
        if (!confirm('Create ' + deliverables.length + ' deliverable(s) in the project MDL?\n\nOne .yaml per tracking number, in archive/<originator>/mdl/. Already-present ones are skipped.')) return;
        btn.disabled = true;
        var s = { created: 0, skipped: 0, errors: 0 };
        for (var i = 0; i < deliverables.length; i++) {
            setStatus('Creating ' + (i + 1) + '/' + deliverables.length + ' — ' + deliverables[i].tracking);
            try { s[await instantiateOne(archiveRoot, deliverables[i])]++; }
            catch (e) { s.errors++; T('Failed to create ' + deliverables[i].tracking + ' — ' + (e.message || e), 'error'); }
        }
        btn.disabled = false;
        setStatus(s.created + ' created, ' + s.skipped + ' already there' + (s.errors ? (', ' + s.errors + ' failed') : '') + '.');
        T('MDL: ' + s.created + ' created, ' + s.skipped + ' already there' + (s.errors ? (', ' + s.errors + ' failed') : '') + '. Reload to see them.', s.errors ? 'warning' : 'success');
    }

    // Show the toolbar button only on the project MDL rollup (addable:false +
    // an mdl path), over http, gated on create permission. Called from main.js
    // init once the context is known.
    function setup(ctx) {
        var btn = document.getElementById('table-add-from-archive');
        if (!btn) return;
        var onHttp = location.protocol === 'http:' || location.protocol === 'https:';
        var isMdlRollup = ctx && ctx.addable === false && /\/mdl\/(table\.html)?$/.test(location.pathname || '');
        if (!(onHttp && isMdlRollup)) return;
        btn.hidden = false;
        btn.addEventListener('click', open);
        if (window.zddc && window.zddc.cap) {
            window.zddc.cap.at(archiveBaseUrl().replace(location.origin, '')).then(function (view) {
                var verbs = (view && view.path_verbs) || '';
                if (verbs.indexOf('c') === -1) { btn.classList.add('is-disabled'); btn.title = "You don't have create access in this project's archive."; }
            });
        }
    }

    app.modules.mdlFromArchive = {
        setup: setup, open: open,
        // test seams
        identityFields: identityFields, deliverableFromFile: deliverableFromFile,
        dedupe: dedupe, walkArchive: walkArchive, instantiateOne: instantiateOne,
    };
})(window.tablesApp);