/**
 * Kanbante — Kanban board: drag & drop with persisted order,
 * filters, and issue creation.
 *
 * Failure contract: if the server rejects a move (HTTP error, network
 * error, or ok:false), the card is put back where it came from and an
 * error (red) toast is shown — the UI never claims a move that the
 * backend did not record.
 */
document.addEventListener('DOMContentLoaded', () => {
    const csrfToken = document.querySelector('meta[name="csrf-token"]')?.content || '';
    const repoFullName = document.querySelector('.kanban-card')?.dataset.repo
        || document.querySelector('footer span')?.textContent || '';

    function orderOf(columnEl) {
        return Array.from(columnEl.querySelectorAll('.kanban-card'))
            .map(card => card.dataset.issue).join(',');
    }

    function revert(evt) {
        const from = evt.from;
        const ref = from.children[evt.oldIndex] || null;
        from.insertBefore(evt.item, ref);
        updateCounts();
    }

    document.querySelectorAll('.column-cards').forEach(col => {
        new Sortable(col, {
            group: 'kanban',
            animation: 200,
            draggable: '.kanban-card',
            ghostClass: 'dragging',
            onStart: function () { window.__kanbanteDragging = true; },
            dragClass: 'dragging',
            onEnd: function (evt) {
                window.__kanbanteDragging = false;
                if (evt.from === evt.to && evt.oldIndex === evt.newIndex) return;
                refreshEmptyHints();
                const card = evt.item;
                const formData = new FormData();
                formData.append('repo_full_name', card.dataset.repo);
                formData.append('issue_number', card.dataset.issue);
                formData.append('to_column', evt.to.dataset.column);
                formData.append('from_column', evt.from.dataset.column);
                formData.append('to_order', orderOf(evt.to));
                formData.append('from_order', orderOf(evt.from));
                formData.append('csrf_token', csrfToken);

                fetch('/api/move', { method: 'POST', body: formData })
                    .then(async r => {
                        const data = await r.json().catch(() => ({}));
                        if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
                        return data;
                    })
                    .then(data => {
                        updateCounts();
                        const targetCol = evt.to.closest('.kanban-column');
                        const badge = targetCol?.querySelector('.column-count');
                        if (badge?.classList.contains('over')) {
                            showToast('⚠️ Limite WIP dépassée dans ' + evt.to.dataset.column.replace('_', ' ') + ' (' + badge.textContent + ')', true);
                        }
                        let msg = '✅ Déplacé vers ' + evt.to.dataset.column.replace('_', ' ');
                        if (data.gitea_sync === 'closed') msg += ' · issue fermée dans Gitea';
                        if (data.gitea_sync === 'reopened') msg += ' · issue rouverte dans Gitea';
                        if (data.gitea_sync === 'failed') {
                            showToast('⚠️ Déplacé localement, mais la synchro Gitea a échoué', true);
                            return;
                        }
                        showToast(msg);
                    })
                    .catch(err => {
                        console.error('Move failed:', err);
                        revert(evt);
                        refreshEmptyHints();
                        showToast('❌ Échec du déplacement — carte replacée', true);
                    });
            }
        });
    });

    // ── Filters (text + label), client-side ────────────────
    const textFilter = document.getElementById('card-filter');
    const labelFilter = document.getElementById('label-filter');
    function applyFilters() {
        const q = (textFilter?.value || '').toLowerCase();
        const label = (labelFilter?.value || '').toLowerCase();
        document.querySelectorAll('.kanban-card').forEach(card => {
            const matchesText = !q || (card.dataset.title || '').includes(q);
            const matchesLabel = !label || (card.dataset.labels || '').split(',').includes(label);
            card.style.display = (matchesText && matchesLabel) ? '' : 'none';
        });
        updateCounts();
    }
    textFilter?.addEventListener('input', applyFilters);
    labelFilter?.addEventListener('change', applyFilters);

    // ── Create issue (goes to Gitea, card lands in Backlog) ─
    const createForm = document.getElementById('create-issue-form');
    createForm?.addEventListener('submit', async (e) => {
        e.preventDefault();
        const titleInput = document.getElementById('new-issue-title');
        const title = titleInput.value.trim();
        if (!title || !repoFullName) return;
        const formData = new FormData();
        formData.append('repo_full_name', repoFullName);
        formData.append('title', title);
        formData.append('column', 'backlog');
        formData.append('csrf_token', csrfToken);
        try {
            const r = await fetch('/api/issues', { method: 'POST', body: formData });
            const data = await r.json().catch(() => ({}));
            if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
            showToast('✅ Issue #' + data.issue.number + ' créée');
            setTimeout(() => location.reload(), 600);
        } catch (err) {
            console.error('Create failed:', err);
            showToast('❌ Échec de la création : ' + err.message, true);
        }
    });

    // The "Glissez une carte ici" hint is rendered by the server only
    // for columns empty at page load. After a drag, the DOM is the
    // truth: remove the hint from columns that hold cards, restore it
    // on columns that became empty. (Bug reported 2026-10-11: the
    // hint stayed forever after dropping a card into an empty column.)
    function refreshEmptyHints() {
        document.querySelectorAll('.column-cards').forEach(list => {
            const hint = list.querySelector('.column-empty');
            const hasCards = !!list.querySelector('.kanban-card');
            if (hasCards && hint) hint.remove();
            if (!hasCards && !hint) {
                const p = document.createElement('p');
                p.className = 'column-empty';
                p.textContent = 'Glissez une carte ici';
                list.appendChild(p);
            }
        });
    }

    function updateCounts() {
        document.querySelectorAll('.kanban-column').forEach(col => {
            const count = col.querySelectorAll('.kanban-card').length;
            const badge = col.querySelector('.column-count');
            if (!badge) return;
            const limit = parseInt(badge.dataset.limit || '0', 10);
            if (limit > 0) {
                badge.textContent = count + '/' + limit;
                badge.classList.toggle('over', count > limit);
            } else {
                badge.textContent = count;
            }
        });
    }

    // Exposed for board-live.js (issue #15): after a remote refresh
    // swaps column fragments, filters/counts/hints must be recomputed.
    window.kanbanteApplyFilters = applyFilters;
    window.kanbanteRefreshHints = refreshEmptyHints;
    window.kanbanteUpdateCounts = updateCounts;

    // Keyboard: "/" jumps to the filter box.
    document.addEventListener('keydown', (e) => {
        if (e.key === '/' && !/INPUT|TEXTAREA|SELECT/.test(document.activeElement?.tagName || '')) {
            e.preventDefault();
            document.getElementById('card-filter')?.focus();
        }
    });

    // ── Repo context (repoFullName is declared at the top) ──
    const [repoOwner, repoName] = (repoFullName || '').split('/', 2);

    // ── Notes panel: collapsible, resizable, autosave ──────
    const notesPanel = document.getElementById('notes-panel');
    if (notesPanel) {
        const widthKey = 'kb.notes.w.' + repoFullName;
        const collapsedKey = 'kb.notes.c.' + repoFullName;
        const savedWidth = parseInt(localStorage.getItem(widthKey) || '0', 10);
        if (savedWidth >= 200 && savedWidth <= 560) notesPanel.style.width = savedWidth + 'px';
        const toggleBtn = document.getElementById('notes-toggle');
        function applyCollapsed(collapsed) {
            notesPanel.classList.toggle('collapsed', collapsed);
            toggleBtn.textContent = collapsed ? '⤡' : '⤢';
            toggleBtn.title = collapsed ? 'Déplier le panneau' : 'Replier le panneau';
        }
        applyCollapsed(localStorage.getItem(collapsedKey) === '1');
        toggleBtn?.addEventListener('click', () => {
            const collapsed = !notesPanel.classList.contains('collapsed');
            applyCollapsed(collapsed);
            localStorage.setItem(collapsedKey, collapsed ? '1' : '0');
        });

        const handle = document.getElementById('notes-resize');
        handle?.addEventListener('pointerdown', (e) => {
            e.preventDefault();
            const startX = e.clientX;
            const startW = notesPanel.getBoundingClientRect().width;
            function onMove(ev) {
                const w = Math.min(560, Math.max(200, startW + (startX - ev.clientX)));
                notesPanel.style.width = w + 'px';
            }
            function onUp() {
                window.removeEventListener('pointermove', onMove);
                window.removeEventListener('pointerup', onUp);
                localStorage.setItem(widthKey, String(Math.round(notesPanel.getBoundingClientRect().width)));
            }
            window.addEventListener('pointermove', onMove);
            window.addEventListener('pointerup', onUp);
        });

        const notesText = document.getElementById('notes-text');
        const notesStatus = document.getElementById('notes-status');
        let notesTimer = null;
        async function saveNotes() {
            const fd = new FormData();
            fd.append('repo_full_name', repoFullName);
            fd.append('note', notesText.value);
            fd.append('csrf_token', csrfToken);
            notesStatus.textContent = '💾 Enregistrement...';
            try {
                const r = await fetch('/api/notes', { method: 'POST', body: fd });
                const data = await r.json().catch(() => ({}));
                if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
                notesStatus.textContent = '✓ Enregistré à ' + new Date().toLocaleTimeString('fr-CA');
            } catch (err) {
                notesStatus.textContent = '❌ Échec : ' + err.message;
            }
        }
        notesText?.addEventListener('input', () => {
            notesStatus.textContent = '✎ Modifié...';
            clearTimeout(notesTimer);
            notesTimer = setTimeout(saveNotes, 1200);
        });
        document.getElementById('notes-form')?.addEventListener('submit', (e) => {
            e.preventDefault();
            clearTimeout(notesTimer);
            saveNotes();
        });
    }

    // ── Label manager ──────────────────────────────────────
    let repoLabelsCache = null;
    async function fetchRepoLabels() {
        if (repoLabelsCache) return repoLabelsCache;
        const r = await fetch(`/api/repos/${repoOwner}/${repoName}/labels`);
        const data = await r.json().catch(() => ({}));
        if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
        repoLabelsCache = data.labels;
        return repoLabelsCache;
    }

    function labelChipEl(label) {
        const span = document.createElement('span');
        span.className = 'label-tag';
        const color = /^[0-9a-fA-F]{6}$/.test(label.color || '') ? label.color : '888888';
        span.style.background = '#' + color + '30';
        span.style.color = '#' + color;
        span.textContent = label.name;
        return span;
    }

    const labelModal = document.getElementById('label-modal');
    async function renderLabelList() {
        const box = document.getElementById('label-list');
        box.innerHTML = '';
        try {
            const labels = await fetchRepoLabels();
            if (!labels.length) box.innerHTML = '<p class="detail-empty">Aucune étiquette dans ce dépôt.</p>';
            labels.forEach(label => {
                const row = document.createElement('div');
                row.className = 'label-row';
                row.appendChild(labelChipEl(label));
                const del = document.createElement('button');
                del.type = 'button';
                del.className = 'btn-sm label-del';
                del.textContent = '🗑️ Supprimer';
                del.addEventListener('click', async () => {
                    if (!confirm('Supprimer l\'étiquette « ' + label.name + ' » de tout le dépôt ?')) return;
                    try {
                        const r = await fetch(`/api/repos/${repoOwner}/${repoName}/labels/${label.id}`,
                            { method: 'DELETE', headers: { 'X-CSRF-Token': csrfToken } });
                        const data = await r.json().catch(() => ({}));
                        if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
                        repoLabelsCache = repoLabelsCache.filter(l => l.id !== label.id);
                        row.remove();
                        showToast('✅ Étiquette supprimée');
                    } catch (err) { showToast('❌ ' + err.message, true); }
                });
                row.appendChild(del);
                box.appendChild(row);
            });
        } catch (err) {
            box.innerHTML = '<p class="detail-empty">Erreur : ' + err.message + '</p>';
        }
    }
    document.getElementById('labels-btn')?.addEventListener('click', () => {
        labelModal.hidden = false;
        renderLabelList();
    });
    document.getElementById('label-modal-close')?.addEventListener('click', () => { labelModal.hidden = true; });
    labelModal?.addEventListener('click', (e) => { if (e.target === labelModal) labelModal.hidden = true; });
    document.querySelectorAll('.swatch').forEach(sw => sw.addEventListener('click', () => {
        document.getElementById('new-label-color').value = sw.dataset.color;
    }));
    document.getElementById('label-create-form')?.addEventListener('submit', async (e) => {
        e.preventDefault();
        const name = document.getElementById('new-label-name').value.trim();
        const color = document.getElementById('new-label-color').value.replace('#', '');
        if (!name) return;
        const fd = new FormData();
        fd.append('name', name);
        fd.append('color', color);
        fd.append('csrf_token', csrfToken);
        try {
            const r = await fetch(`/api/repos/${repoOwner}/${repoName}/labels`, { method: 'POST', body: fd });
            const data = await r.json().catch(() => ({}));
            if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
            if (repoLabelsCache) repoLabelsCache.push(data.label);
            document.getElementById('new-label-name').value = '';
            renderLabelList();
            showToast('✅ Étiquette « ' + data.label.name + ' » créée');
        } catch (err) { showToast('❌ ' + err.message, true); }
    });

    // ── Card detail drawer ─────────────────────────────────
    // A click opens the panel; a drag must not. Track pointer travel.
    let downX = 0, downY = 0;
    document.addEventListener('pointerdown', (e) => { downX = e.clientX; downY = e.clientY; });
    document.querySelectorAll('.kanban-card').forEach(card => {
        card.addEventListener('click', (e) => {
            if (Math.hypot(e.clientX - downX, e.clientY - downY) > 6) return;
            if (e.target.closest('a')) return;
            openDetail(card.dataset.repo, card.dataset.issue);
        });
    });

    const drawer = document.getElementById('card-detail');
    const overlay = document.getElementById('detail-overlay');
    let currentIssue = null; // {repo, number}

    function renderMarkdown(text) {
        if (window.marked && window.DOMPurify) {
            return DOMPurify.sanitize(marked.parse(text || ''));
        }
        const div = document.createElement('div');
        div.textContent = text || '';
        return div.innerHTML;
    }

    function closeDetail() {
        drawer.hidden = true;
        overlay.hidden = true;
        currentIssue = null;
    }
    document.getElementById('detail-close')?.addEventListener('click', closeDetail);
    overlay?.addEventListener('click', closeDetail);
    document.addEventListener('keydown', (e) => { if (e.key === 'Escape') closeDetail(); });

    async function openDetail(repoFull, number) {
        const [owner, repo] = repoFull.split('/', 2);
        currentIssue = { repo: repoFull, number };
        drawer.hidden = false;
        overlay.hidden = false;
        document.getElementById('detail-number').textContent = '#' + number;
        document.getElementById('detail-title').textContent = 'Chargement...';
        document.getElementById('detail-body').innerHTML = '';
        document.getElementById('detail-comments').innerHTML = '';
        try {
            const r = await fetch(`/api/issues/${owner}/${repo}/${number}`);
            const data = await r.json().catch(() => ({}));
            if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
            fillDetail(data.issue, data.comments);
            loadCodeLinks(repoFull, number);
        } catch (err) {
            document.getElementById('detail-title').textContent = 'Erreur de chargement';
            showToast('❌ Détail indisponible : ' + err.message, true);
        }
    }


    async function loadCodeLinks(repoFull, number) {
        const box = document.getElementById('detail-code');
        if (!box) return;
        box.innerHTML = '';
        const [owner, repo] = repoFull.split('/', 2);
        try {
            const r = await fetch(`/api/issues/${owner}/${repo}/${number}/code`);
            const data = await r.json().catch(() => ({}));
            if (!r.ok || !data.ok) return;
            const parts = [];
            if ((data.branches || []).length) {
                parts.push('🌿 Branches : ' + data.branches.map(b => `<code>${b}</code>`).join(', '));
            }
            for (const pr of data.pulls || []) {
                const state = pr.merged ? 'fusionnée' : (pr.state === 'open' ? 'ouverte' : 'fermée');
                parts.push(`🔀 <a href="${pr.html_url}" target="_blank" rel="noopener">PR #${pr.number}</a> ${pr.title} — ${state}`);
            }
            for (const c of (data.commits || []).slice(0, 8)) {
                parts.push(`⑂ <a href="${c.html_url}" target="_blank" rel="noopener"><code>${c.sha}</code></a> ${c.message}${c.date ? ' · ' + c.date : ''}`);
            }
            const hasBranch = (data.branches || []).length > 0;
            if (!hasBranch && data.suggested_branch) {
                parts.push(`🌿 <input id="branch-name" class="branch-input" value="${data.suggested_branch}" size="36" spellcheck="false"> <button type="button" class="btn-sm" id="branch-create">Créer la branche</button>`);
            }
            box.innerHTML = '<h3 class="detail-comments-title">🧬 Code lié</h3>' + (
                parts.length
                    ? parts.map(p => `<div class="code-line">${p}</div>`).join('')
                    : '<div class="code-line">Aucun élément lié pour l\'instant.</div>'
            );
            const createBtn = document.getElementById('branch-create');
            if (createBtn) {
                createBtn.addEventListener('click', async () => {
                    const name = (document.getElementById('branch-name') || {}).value || '';
                    const form = new FormData();
                    form.append('name', name);
                    form.append('csrf_token', csrfToken);
                    createBtn.disabled = true;
                    try {
                        const r2 = await fetch(`/api/issues/${owner}/${repo}/${number}/branch`, { method: 'POST', body: form });
                        const body = await r2.json().catch(() => ({}));
                        if (!r2.ok || !body.ok) throw new Error(body.error || ('HTTP ' + r2.status));
                        showToast(body.exists
                            ? `🌿 La branche ${body.branch} existait déjà`
                            : `🌿 Branche ${body.branch} créée depuis ${body.from} — carte en « En cours »`);
                        loadCodeLinks(repoFull, number);
                    } catch (err) {
                        createBtn.disabled = false;
                        showToast('❌ Branche non créée : ' + err.message, true);
                    }
                });
            }
        } catch (err) { /* le code est un bonus, jamais bloquant */ }
    }

    function fillDetail(issue, comments) {
        document.getElementById('detail-title').textContent = issue.title;
        const stateChip = document.getElementById('detail-state');
        stateChip.textContent = issue.state === 'closed' ? '✅ Fermée' : '🟢 Ouverte';
        const meta = [];
        if (issue.milestone) meta.push('🎯 ' + issue.milestone);
        if (issue.due_date) meta.push('📅 échéance ' + String(issue.due_date).slice(0, 10));
        meta.push('créée le ' + String(issue.created_at).slice(0, 10));
        for (const a of issue.assignees || []) {
            meta.push('👤 ' + a.login);
        }
        document.getElementById('detail-meta').textContent = meta.join(' · ');
        const labelsBox = document.getElementById('detail-labels');
        labelsBox.innerHTML = '';
        (issue.labels || []).forEach(l => {
            const span = document.createElement('span');
            span.className = 'label-tag';
            const color = /^[0-9a-fA-F]{6}$/.test(l.color || '') ? l.color : '888888';
            span.style.background = '#' + color + '30';
            span.style.color = '#' + color;
            span.textContent = l.name;
            labelsBox.appendChild(span);
        });
        renderLabelToggles(issue);
        document.getElementById('detail-body').innerHTML =
            issue.body ? renderMarkdown(issue.body) : '<p class="detail-empty">Aucune description.</p>';
        document.getElementById('detail-gitea-link').href = issue.html_url || '#';
        const box = document.getElementById('detail-comments');
        box.innerHTML = '';
        (comments || []).forEach(c => box.appendChild(commentNode(c)));
        if (!comments || comments.length === 0) {
            box.innerHTML = '<p class="detail-empty">Aucun commentaire.</p>';
        }
    }

    async function renderLabelToggles(issue) {
        const box = document.getElementById('detail-label-toggles');
        if (!box) return;
        box.innerHTML = '';
        let all = [];
        try { all = await fetchRepoLabels(); } catch { return; }
        const activeIds = new Set((issue.labels || []).map(l => l.id));
        all.forEach(label => {
            const chip = labelChipEl(label);
            chip.classList.add('label-toggle');
            if (activeIds.has(label.id)) chip.classList.add('on');
            chip.title = activeIds.has(label.id) ? 'Retirer de l\'issue' : 'Ajouter à l\'issue';
            chip.addEventListener('click', async () => {
                const action = activeIds.has(label.id) ? 'remove' : 'add';
                const fd = new FormData();
                fd.append('label_id', label.id);
                fd.append('action', action);
                fd.append('csrf_token', csrfToken);
                try {
                    const [owner, repo] = currentIssue.repo.split('/', 2);
                    const r = await fetch(`/api/issues/${owner}/${repo}/${currentIssue.number}/labels`,
                        { method: 'POST', body: fd });
                    const data = await r.json().catch(() => ({}));
                    if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
                    issue.labels = data.labels;
                    // Refresh the chips in the drawer and on the board card.
                    const labelsBox = document.getElementById('detail-labels');
                    labelsBox.innerHTML = '';
                    data.labels.forEach(l => labelsBox.appendChild(labelChipEl(l)));
                    updateCardLabels(currentIssue.number, data.labels);
                    renderLabelToggles(issue);
                } catch (err) { showToast('❌ ' + err.message, true); }
            });
            box.appendChild(chip);
        });
    }

    function updateCardLabels(number, labels) {
        const card = document.querySelector(`.kanban-card[data-issue="${number}"]`);
        if (!card) return;
        card.dataset.labels = labels.map(l => (l.name || '').toLowerCase()).join(',');
        let box = card.querySelector('.card-labels');
        if (!box && labels.length) {
            box = document.createElement('div');
            box.className = 'card-labels';
            card.querySelector('.card-title')?.after(box);
        }
        if (box) {
            box.innerHTML = '';
            labels.forEach(l => box.appendChild(labelChipEl(l)));
            box.style.display = labels.length ? '' : 'none';
        }
    }

    function commentNode(c) {
        const div = document.createElement('div');
        div.className = 'comment';
        const head = document.createElement('div');
        head.className = 'comment-head';
        head.textContent = '👤 ' + (c.user?.login || '?') + ' · ' + String(c.created_at).slice(0, 16).replace('T', ' ');
        const bodyEl = document.createElement('div');
        bodyEl.className = 'comment-body';
        bodyEl.innerHTML = renderMarkdown(c.body || '');
        div.appendChild(head);
        div.appendChild(bodyEl);
        return div;
    }

    document.getElementById('comment-form')?.addEventListener('submit', async (e) => {
        e.preventDefault();
        if (!currentIssue) return;
        const textarea = document.getElementById('comment-body');
        const body = textarea.value.trim();
        if (!body) return;
        const [owner, repo] = currentIssue.repo.split('/', 2);
        const formData = new FormData();
        formData.append('body', body);
        formData.append('csrf_token', csrfToken);
        try {
            const r = await fetch(`/api/issues/${owner}/${repo}/${currentIssue.number}/comments`, { method: 'POST', body: formData });
            const data = await r.json().catch(() => ({}));
            if (!r.ok || !data.ok) throw new Error(data.error || ('HTTP ' + r.status));
            const box = document.getElementById('detail-comments');
            if (box.querySelector('.detail-empty')) box.innerHTML = '';
            box.appendChild(commentNode(data.comment));
            textarea.value = '';
            showToast('✅ Commentaire publié dans Gitea');
        } catch (err) {
            showToast('❌ Échec du commentaire : ' + err.message, true);
        }
    });

    function showToast(msg, isError = false) {
        const toast = document.createElement('div');
        toast.className = 'toast' + (isError ? ' error' : '');
        toast.textContent = msg;
        document.body.appendChild(toast);
        setTimeout(() => toast.remove(), 3000);
    }
});