// ── Bucket management ──

import { $, esc, api } from './util.js';
import { state, CARD_COLORS } from './state.js';
import { showDialog } from './dialog.js';

// ── Bucket context menu ──

const ctxMenu = document.createElement('div');
ctxMenu.id = 'bucket-ctx';
ctxMenu.className = 'fixed z-[85] bg-t-surface border border-t-border shadow-2xl hidden';
ctxMenu.style.minWidth = '170px';
document.body.appendChild(ctxMenu);

let ctxBucketId = null;

function hideBucketCtx() { ctxMenu.classList.add('hidden'); ctxBucketId = null; }
document.addEventListener('click', hideBucketCtx);

async function showBucketCtx(x, y, bucket) {
    ctxBucketId = bucket.id;
    const idx = state.buckets.findIndex(b => b.id == bucket.id);
    const canLeft = idx > 0;
    const canRight = idx < state.buckets.length - 1;

    ctxMenu.innerHTML = `<div class="py-1">
        <button class="ctx-item" data-baction="rename"><i class="ph ph-pencil-simple text-sm"></i><span class="font-pixel text-[10px]">rename</span></button>
        <button class="ctx-item" data-baction="color"><i class="ph ph-palette text-sm"></i><span class="font-pixel text-[10px]">color</span><i class="ph ph-caret-right text-xs ml-auto"></i></button>
        <div style="height:1px;background:var(--t-border);margin:2px 0"></div>
        <button class="ctx-item ${!canLeft ? 'opacity-30 pointer-events-none' : ''}" data-baction="move-left"><i class="ph ph-arrow-left text-sm"></i><span class="font-pixel text-[10px]">move left</span></button>
        <button class="ctx-item ${!canRight ? 'opacity-30 pointer-events-none' : ''}" data-baction="move-right"><i class="ph ph-arrow-right text-sm"></i><span class="font-pixel text-[10px]">move right</span></button>
        <div style="height:1px;background:var(--t-border);margin:2px 0"></div>
        <button class="ctx-item" data-baction="delete-keep"><i class="ph ph-trash text-sm"></i><span class="font-pixel text-[10px]">delete (keep cards)</span></button>
        <button class="ctx-item danger" data-baction="delete-all"><i class="ph ph-trash text-sm"></i><span class="font-pixel text-[10px]">delete + cards</span></button>
    </div>
    <div id="bctx-colors" class="hidden px-3 py-2 border-t border-t-border">
        <div class="flex flex-wrap gap-1.5">
            ${CARD_COLORS.map(c => `<button class="w-5 h-5 rounded-sm border-2 transition-all hover:scale-125 ${c.hex === (bucket.color || '#64748b') ? 'border-t-bright' : 'border-transparent'}" style="background:${c.hex}" data-bctx-color="${c.hex}"></button>`).join('')}
        </div>
    </div>`;

    ctxMenu.style.left = Math.min(x, innerWidth - 178) + 'px';
    ctxMenu.style.top = Math.min(y, innerHeight - 250) + 'px';
    ctxMenu.classList.remove('hidden');

    ctxMenu.querySelectorAll('[data-baction]').forEach(btn => btn.addEventListener('click', async e => {
        e.stopPropagation();
        const a = btn.dataset.baction;

        if (a === 'color') {
            e.stopPropagation();
            document.getElementById('bctx-colors').classList.toggle('hidden');
            return;
        }
        else if (a === 'rename') {
            hideBucketCtx();
            const name = await showDialog({ title: 'rename_bucket', input: true, placeholder: bucket.name });
            if (!name || !name.trim()) return;
            await api(`api/buckets/${bucket.id}`, { method: 'PATCH', body: { name: name.trim() } });
            await loadBuckets(); window._renderBoard();
        }
        else if (a === 'move-left' || a === 'move-right') {
            hideBucketCtx();
            const swapIdx = a === 'move-left' ? idx - 1 : idx + 1;
            const other = state.buckets[swapIdx];
            if (!other) return;
            await api(`api/buckets/${bucket.id}`, { method: 'PATCH', body: { position: swapIdx } });
            await api(`api/buckets/${other.id}`, { method: 'PATCH', body: { position: idx } });
            await loadBuckets(); window._renderBoard();
        }
        else if (a === 'delete-keep') {
            hideBucketCtx();
            const ok = await showDialog({ title: 'delete_bucket', message: `"${bucket.name}" loeschen? Karten bleiben erhalten.`, danger: true, okLabel: 'delete' });
            if (!ok) return;
            if (state.activeBucket == bucket.id) state.activeBucket = 'all';
            await api(`api/buckets/${bucket.id}`, { method: 'DELETE' });
            await loadBuckets(); await window._reloadAll();
        }
        else if (a === 'delete-all') {
            hideBucketCtx();
            const cards = state.cards.filter(c => c.bucket_id == bucket.id);
            const ok = await showDialog({ title: 'delete_bucket', message: `"${bucket.name}" und ${cards.length} Karte(n) loeschen?`, danger: true, okLabel: 'delete all' });
            if (!ok) return;
            for (const c of cards) await api(`api/cards/${c.id}`, { method: 'DELETE' });
            if (state.activeBucket == bucket.id) state.activeBucket = 'all';
            await api(`api/buckets/${bucket.id}`, { method: 'DELETE' });
            await loadBuckets(); await window._reloadAll();
        }
    }));

    // Bucket color clicks
    ctxMenu.querySelectorAll('[data-bctx-color]').forEach(btn => btn.addEventListener('click', async e => {
        e.stopPropagation();
        hideBucketCtx();
        await api(`api/buckets/${bucket.id}`, { method: 'PATCH', body: { color: btn.dataset.bctxColor } });
        await loadBuckets();
        window._renderBoard();
    }));
}

const bar = $('bucket-bar');
const inpBucket = $('inp-bucket');
const searchFilter = $('search-bucket-filter');
const tasksFilter = $('tasks-bucket-filter');

export async function loadBuckets() {
    state.buckets = await api('api/buckets');
    renderBar();
    populateSelects();
}

export function populateSelects() {
    const bucketOpts = state.buckets.map(b => `<option value="${b.id}">${esc(b.name)}</option>`).join('');
    if (inpBucket) inpBucket.innerHTML = `<option value="">no bucket</option>` + bucketOpts;
    if (searchFilter) searchFilter.innerHTML = `<option value="">all buckets</option><option value="none">unsorted</option>` + bucketOpts;
    if (tasksFilter) {
        const cur = tasksFilter.value;
        tasksFilter.innerHTML = `<option value="">all buckets</option><option value="none">unsorted</option>` + bucketOpts;
        const valid = cur === '' || cur === 'none' || state.buckets.some(b => String(b.id) === cur);
        tasksFilter.value = valid ? cur : '';
    }
}

function autoBucketNameFromCard(card) {
    const existing = new Set(state.buckets.map(b => String(b.name || '').trim().toLowerCase()).filter(Boolean));
    const base = String(card?.title || '').trim().replace(/\s+/g, ' ').slice(0, 40) || 'bucket';
    if (!existing.has(base.toLowerCase())) return base;
    let i = 2;
    while (existing.has(`${base} ${i}`.toLowerCase())) i++;
    return `${base} ${i}`;
}

function updateHeaderTint() {
    const tint = $('header-tint');
    if (!tint) return;
    const bucket = state.buckets.find(b => b.id == state.activeBucket);
    if (bucket && bucket.color) {
        tint.style.background = `linear-gradient(135deg, ${bucket.color}30 0%, ${bucket.color}12 100%)`;
        tint.style.opacity = '1';
    } else {
        tint.style.opacity = '0';
    }
}

function renderBar() {
    if (!bar) return;
    const tab = (active) => `bucket-tab ${active ? 'active' : ''} flex items-center gap-1.5 px-2.5 py-1 text-xs border border-t-border text-t-muted hover:border-t-accent hover:text-t-accent transition-colors shrink-0`;

    bar.innerHTML = `
        <button class="${tab(state.activeBucket === 'all')}" data-bucket="all"><i class="ph ph-squares-four text-sm"></i><span class="font-pixel text-[10px]">all</span></button>
        <button class="${tab(state.activeBucket === 'current')}" data-bucket="current"><i class="ph ph-lightning text-sm"></i><span class="font-pixel text-[10px]">current</span></button>
        <button class="${tab(state.activeBucket === 'none')}" data-bucket="none"><i class="ph ph-tray text-sm"></i><span class="font-pixel text-[10px]">unsorted</span></button>
        ${state.buckets.map(b => {
            const c = b.color || '#64748b';
            const active = state.activeBucket == b.id;
            return `<button class="${tab(active)}" data-bucket="${b.id}" draggable="true" data-bucket-drag="${b.id}" style="border-top:3px solid ${c};${active ? `border-color:${c};color:${c}` : ''}"><i class="ph ph-folder text-sm"></i><span class="font-pixel text-[10px]">${esc(b.name)}</span></button>`;
        }).join('')}
        <button id="add-bucket-btn" class="bucket-add flex items-center gap-1 px-2 py-1 text-xs text-t-dim hover:text-t-accent transition-colors shrink-0"><i class="ph ph-plus text-sm"></i><span class="font-pixel text-[10px]">bucket</span></button>`;

    updateHeaderTint();

    let draggingBucketId = null;

    bar.querySelectorAll('.bucket-tab').forEach(t => {
        const bid = t.dataset.bucket;
        const isUser = bid !== 'all' && bid !== 'none';

        t.addEventListener('click', () => { state.activeBucket = bid; state.activeGroup = null; renderBar(); window._renderBoard(); });

        if (isUser) {
            t.addEventListener('contextmenu', e => {
                e.preventDefault(); e.stopPropagation();
                const bucket = state.buckets.find(b => b.id == bid);
                if (bucket) showBucketCtx(e.clientX, e.clientY, bucket);
            });

            // Bucket drag
            t.addEventListener('dragstart', e => {
                draggingBucketId = bid;
                e.dataTransfer.setData('application/x-bucket', bid);
                e.dataTransfer.effectAllowed = 'move';
                t.style.opacity = '0.3';
            });
            t.addEventListener('dragend', () => {
                t.style.opacity = '';
                draggingBucketId = null;
                bar.querySelectorAll('.bucket-drop-left,.bucket-drop-right').forEach(x => x.classList.remove('bucket-drop-left', 'bucket-drop-right'));
            });
        }

        t.addEventListener('dragover', e => {
            e.preventDefault();
            if (draggingBucketId && isUser && draggingBucketId !== bid) {
                // Bucket reorder indicator
                const rect = t.getBoundingClientRect();
                const left = e.clientX < rect.left + rect.width / 2;
                t.classList.toggle('bucket-drop-left', left);
                t.classList.toggle('bucket-drop-right', !left);
                t.classList.remove('drag-over');
            } else if (!draggingBucketId) {
                // Card drop on bucket
                t.classList.add('drag-over');
            }
        });
        t.addEventListener('dragleave', () => {
            t.classList.remove('drag-over', 'bucket-drop-left', 'bucket-drop-right');
        });
        t.addEventListener('drop', async e => {
            e.preventDefault();
            t.classList.remove('drag-over', 'bucket-drop-left', 'bucket-drop-right');

            // Bucket reorder
            const dragBid = e.dataTransfer.getData('application/x-bucket');
            if (dragBid && isUser && dragBid !== bid) {
                const rect = t.getBoundingClientRect();
                const before = e.clientX < rect.left + rect.width / 2;
                const ids = state.buckets.map(b => String(b.id)).filter(i => i !== dragBid);
                const targetIdx = ids.indexOf(String(bid));
                ids.splice(before ? targetIdx : targetIdx + 1, 0, dragBid);
                await Promise.all(ids.map((id, i) => api(`api/buckets/${id}`, { method: 'PATCH', body: { position: i } })));
                await loadBuckets();
                window._renderBoard();
                return;
            }

            // Card drop on bucket
            const cardId = e.dataTransfer.getData('text/plain');
            if (!cardId) return;
            const bucketId = bid === 'none' ? null : ((bid === 'all' || bid === 'current') ? undefined : bid);
            if (bucketId === undefined) return;
            await api(`api/cards/${cardId}`, { method: 'PATCH', body: { bucket_id: bucketId, parent_id: null } });
            await window._reloadAll();
        });
    });

    const addBtn = $('add-bucket-btn');
    addBtn?.addEventListener('click', async () => {
        const name = await showDialog({ title: 'new_bucket', input: true, placeholder: '> bucket name...' });
        if (!name || !name.trim()) return;
        await api('api/buckets', { method: 'POST', body: { name: name.trim() } });
        await loadBuckets();
        window._renderBoard();
    });

    const isCardDrag = e => Array.from(e.dataTransfer?.types || []).includes('text/plain');

    addBtn?.addEventListener('dragover', e => {
        if (!isCardDrag(e)) return;
        e.preventDefault();
        e.dataTransfer.dropEffect = 'move';
        addBtn.classList.add('drag-over');
    });
    addBtn?.addEventListener('dragleave', () => addBtn.classList.remove('drag-over'));
    addBtn?.addEventListener('drop', async e => {
        addBtn.classList.remove('drag-over');
        const cardId = e.dataTransfer.getData('text/plain');
        if (!cardId) return;
        e.preventDefault();
        const card = state.cards.find(c => String(c.id) === String(cardId));
        const created = await api('api/buckets', { method: 'POST', body: { name: autoBucketNameFromCard(card) } });
        if (!created?.id) return;
        await api(`api/cards/${cardId}`, { method: 'PATCH', body: { bucket_id: created.id, parent_id: null } });
        await loadBuckets();
        await window._reloadAll();
    });
}