/**
 * Kanbante — Triage session (issue #11).
 *
 * One backlog card at a time, decided from the keyboard:
 * 1-5 move to a column (5 = done, closes), L labels panel,
 * A assign me, X close, Enter next (skip), Z undo last move.
 * Decisions hit the same APIs as the board (/api/move, label
 * toggles, assign-self) — the queue lives entirely client-side.
 */
(function () {
    var main = document.querySelector('.triage-main');
    if (!main) return;
    var repo = main.getAttribute('data-repo');
    var parts = repo.split('/');
    var owner = parts[0], name = parts.slice(1).join('/');
    var csrf = (document.querySelector('meta[name="csrf-token"]') || {}).content || '';
    var queue = JSON.parse(document.getElementById('triage-queue').textContent || '[]');

    var idx = 0;
    var history = [];        // {number, to} for undoable moves
    var counts = {};         // decision tally for the summary
    var busy = false;

    var el = function (id) { return document.getElementById(id); };
    var cardEl = el('triage-card'), doneEl = el('triage-done');
    var statusEl = el('triage-status'), labelsPanel = el('triage-labels');

    function current() { return queue[idx] || null; }

    function status(msg, isError) {
        statusEl.textContent = msg || '';
        statusEl.style.color = isError ? '#ff7b72' : '';
    }

    function render() {
        var card = current();
        var total = queue.length;
        el('triage-bar').style.width = total ? Math.round(100 * idx / total) + '%' : '100%';
        el('triage-progress-label').textContent = total
            ? 'Carte ' + Math.min(idx + 1, total) + ' / ' + total
            : '0 carte';
        if (!card) {
            cardEl.hidden = true;
            el('triage-keys').hidden = true;
            doneEl.hidden = false;
            var summary = el('triage-summary');
            summary.innerHTML = '';
            var labels = {
                todo: '📋 À faire', in_progress: '🚧 En cours', qa: '🧪 QA',
                review: '👀 Révision', done: '✅ Terminé / fermée',
                skip: '⏭️ Passées (restent au backlog)',
            };
            Object.keys(labels).forEach(function (key) {
                if (counts[key]) {
                    var li = document.createElement('li');
                    li.textContent = labels[key] + ' : ' + counts[key];
                    summary.appendChild(li);
                }
            });
            if (!Object.keys(counts).length) {
                var li = document.createElement('li');
                li.textContent = 'Aucune décision prise.';
                summary.appendChild(li);
            }
            return;
        }
        cardEl.hidden = false;
        doneEl.hidden = true;
        el('tc-num').textContent = '#' + card.number;
        el('tc-date').textContent = card.created_at
            ? 'créée le ' + card.created_at + (card.age_days != null ? ' · ⏳ ' + card.age_days + ' j' : '')
            : '';
        el('tc-link').href = card.html_url || '#';
        el('tc-title').textContent = card.title;
        el('tc-excerpt').textContent = card.excerpt || '(aucune description)';
        var labelsBox = el('tc-labels');
        labelsBox.innerHTML = '';
        (card.labels || []).forEach(function (l) {
            var chip = document.createElement('span');
            chip.className = 'label-tag';
            chip.style.background = '#' + l.color + '30';
            chip.style.color = '#' + l.color;
            chip.textContent = l.name;
            labelsBox.appendChild(chip);
        });
        el('tc-assign').textContent = (card.assignees && card.assignees.length)
            ? '👤 Assignée à : ' + card.assignees.join(', ')
            : '';
        status('');
    }

    function post(url, fields) {
        var data = new FormData();
        Object.keys(fields).forEach(function (k) { data.append(k, fields[k]); });
        data.append('csrf_token', csrf);
        return fetch(url, { method: 'POST', body: data }).then(function (r) {
            return r.json().catch(function () { return {}; }).then(function (body) {
                if (!r.ok || body.ok === false) throw new Error(body.error || ('HTTP ' + r.status));
                return body;
            });
        });
    }

    function advance(kind) {
        counts[kind] = (counts[kind] || 0) + 1;
        idx += 1;
        render();
    }

    function decide(toColumn) {
        var card = current();
        if (!card || busy) return;
        busy = true;
        status('⏳ Envoi…');
        post('/api/move', {
            repo_full_name: repo, issue_number: card.number,
            from_column: 'backlog', to_column: toColumn, from_order: '', to_order: '',
        }).then(function () {
            history.push({ number: card.number, to: toColumn });
            busy = false;
            advance(toColumn);
        }).catch(function (err) {
            busy = false;
            status('❌ ' + err.message + ' — réessaie.', true);
        });
    }

    function undo() {
        var last = history.pop();
        var card = current();
        if (!last || busy) return;
        // The undone card is the one just before the current index.
        var target = queue[idx - 1];
        if (!target || target.number !== last.number) return;
        busy = true;
        status('⏳ Annulation…');
        post('/api/move', {
            repo_full_name: repo, issue_number: last.number,
            from_column: last.to, to_column: 'backlog', from_order: '', to_order: '',
        }).then(function () {
            counts[last.to] = Math.max(0, (counts[last.to] || 1) - 1);
            if (!counts[last.to]) delete counts[last.to];
            idx -= 1;
            busy = false;
            render();
        }).catch(function (err) {
            busy = false;
            history.push(last);
            status('❌ Annulation impossible : ' + err.message, true);
        });
        void card;
    }

    function assignSelf() {
        var card = current();
        if (!card || busy) return;
        busy = true;
        status('⏳ Assignation…');
        post('/api/issues/' + owner + '/' + name + '/' + card.number + '/assign-self', {})
            .then(function (body) {
                card.assignees = body.assignees || card.assignees;
                busy = false;
                render();
                status('👤 Assignée à : ' + (body.assignees || []).join(', '));
            })
            .catch(function (err) { busy = false; status('❌ ' + err.message, true); });
    }

    function openLabels() {
        var card = current();
        if (!card) return;
        labelsPanel.hidden = false;
        var list = el('triage-labels-list');
        list.textContent = 'Chargement…';
        fetch('/api/repos/' + owner + '/' + name + '/labels')
            .then(function (r) { return r.json(); })
            .then(function (data) {
                list.innerHTML = '';
                var mine = (card.labels || []).map(function (l) { return l.name; });
                (data.labels || []).forEach(function (label) {
                    var btn = document.createElement('button');
                    btn.type = 'button';
                    btn.className = 'triage-label-chip' + (mine.includes(label.name) ? ' on' : '');
                    btn.textContent = (mine.includes(label.name) ? '✓ ' : '') + label.name;
                    btn.addEventListener('click', function () {
                        var action = mine.includes(label.name) ? 'remove' : 'add';
                        post('/api/issues/' + owner + '/' + name + '/' + card.number + '/labels',
                            { label_id: label.id, action: action })
                            .then(function (body) {
                                card.labels = body.labels || [];
                                render();
                                openLabels();
                            })
                            .catch(function (err) { status('❌ ' + err.message, true); });
                    });
                    list.appendChild(btn);
                });
                if (!(data.labels || []).length) list.textContent = 'Aucune étiquette dans ce dépôt.';
            })
            .catch(function () { list.textContent = 'Échec du chargement des étiquettes.'; });
    }

    function closeLabels() { labelsPanel.hidden = true; }

    document.querySelectorAll('.triage-keys button').forEach(function (btn) {
        btn.addEventListener('click', function () {
            var act = btn.getAttribute('data-act');
            if (act === 'move') decide(btn.getAttribute('data-col'));
            else if (act === 'close') decide('done');
            else if (act === 'next') { if (current()) advance('skip'); }
            else if (act === 'undo') undo();
            else if (act === 'assign') assignSelf();
            else if (act === 'labels') { labelsPanel.hidden ? openLabels() : closeLabels(); }
        });
    });
    el('triage-labels-close').addEventListener('click', closeLabels);

    document.addEventListener('keydown', function (e) {
        if (e.metaKey || e.ctrlKey || e.altKey) return;
        var tag = (document.activeElement || {}).tagName || '';
        if (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT') return;
        if (!labelsPanel.hidden) {
            if (e.key === 'Escape' || e.key.toLowerCase() === 'l') { e.preventDefault(); closeLabels(); }
            return;
        }
        var colByKey = { '1': 'todo', '2': 'in_progress', '3': 'qa', '4': 'review', '5': 'done' };
        if (colByKey[e.key]) { e.preventDefault(); decide(colByKey[e.key]); }
        else if (e.key === 'Enter') { e.preventDefault(); if (current()) advance('skip'); }
        else if (e.key.toLowerCase() === 'x') { e.preventDefault(); decide('done'); }
        else if (e.key.toLowerCase() === 'l') { e.preventDefault(); openLabels(); }
        else if (e.key.toLowerCase() === 'a') { e.preventDefault(); assignSelf(); }
        else if (e.key.toLowerCase() === 'z') { e.preventDefault(); undo(); }
    });

    render();
})();