const state = {
  ideas: [],
  milestones: [],
  activity: [],
  filter: 'all',
  search: '',
  selected: null,
};

const $ = (sel, root = document) => root.querySelector(sel);
const $$ = (sel, root = document) => Array.from(root.querySelectorAll(sel));
const board = $('#board');
const form = $('#ideaForm');
const detail = $('#detail');
const detailForm = $('#detailForm');
const milestoneSelect = $('#milestoneSelect');

async function api(path, options = {}) {
  const res = await fetch(path, {
    headers: { 'Content-Type': 'application/json', ...(options.headers || {}) },
    ...options,
    body: options.body && typeof options.body !== 'string' ? JSON.stringify(options.body) : options.body,
  });
  const text = await res.text();
  const data = text ? JSON.parse(text) : null;
  if (!res.ok) throw new Error(data?.error || res.statusText);
  return data;
}

function scoreOf(idea) { return Number(idea.score || 0).toFixed(1); }
function escapeHtml(value) {
  return String(value ?? '').replace(/[&<>'"]/g, ch => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', "'": '&#39;', '"': '&quot;' }[ch]));
}
function short(text, len = 126) {
  const value = String(text || '').trim();
  return value.length > len ? `${value.slice(0, len - 1)}…` : value;
}
function milestoneFor(id) { return state.milestones.find(m => m.id === id) || state.milestones[0]; }
function sourceKind(idea) { return /agent|rook|iris|eve|claude|gpt|bot/i.test(`${idea.source} ${idea.sourceName}`) ? 'agent' : 'human'; }
function toast(message) {
  const el = document.createElement('div');
  el.className = 'toast';
  el.textContent = message;
  document.body.append(el);
  setTimeout(() => el.remove(), 2200);
}

function filteredIdeas() {
  const q = state.search.toLowerCase();
  return state.ideas.filter(idea => {
    if (state.filter === 'human' && sourceKind(idea) !== 'human') return false;
    if (state.filter === 'agent' && sourceKind(idea) !== 'agent') return false;
    if (state.filter === 'high' && Number(idea.score) < 4) return false;
    if (!q) return true;
    return [idea.title, idea.description, idea.sourceName, ...(idea.labels || [])].join(' ').toLowerCase().includes(q);
  });
}

function renderStats() {
  const ideas = state.ideas;
  const now = ideas.filter(i => i.milestoneId === 'now').length;
  const agent = ideas.filter(i => sourceKind(i) === 'agent').length;
  const top = ideas.slice().sort((a, b) => b.score - a.score)[0];
  $('#stats').innerHTML = [
    ['Ideas', ideas.length],
    ['Now', now],
    ['Agent drops', agent],
    ['Top score', top ? scoreOf(top) : '—'],
  ].map(([label, value]) => `<div class="stat"><strong>${value}</strong><span>${label}</span></div>`).join('');
}

function renderMilestoneOptions() {
  milestoneSelect.innerHTML = state.milestones.map(m => `<option value="${escapeHtml(m.id)}">${escapeHtml(m.name)}</option>`).join('');
}

function renderActivity() {
  $('#activity').innerHTML = state.activity.slice(0, 8).map(item => `<span class="activity-item">${escapeHtml(short(item.message, 52))}</span>`).join('');
}

function renderBoard() {
  renderStats();
  renderMilestoneOptions();
  renderActivity();
  const ideas = filteredIdeas();
  board.innerHTML = state.milestones.map(milestone => {
    const laneIdeas = ideas
      .filter(idea => (idea.milestoneId || 'inbox') === milestone.id)
      .sort((a, b) => (a.rank - b.rank) || (b.score - a.score));
    const cards = laneIdeas.map(cardHtml).join('') || '<div class="empty">Drop something here</div>';
    return `<article class="lane" data-milestone="${escapeHtml(milestone.id)}" style="--lane-color:${escapeHtml(milestone.color)}">
      <div class="lane-head">
        <div class="lane-title"><h2>${escapeHtml(milestone.name)}</h2><strong>${laneIdeas.length}</strong></div>
        <p>${escapeHtml(milestone.description || milestone.horizon || '')}</p>
      </div>
      <div class="cards">${cards}</div>
    </article>`;
  }).join('');
  bindDrag();
  bindCards();
}

function cardHtml(idea) {
  const tags = [`${sourceKind(idea)}`, idea.sourceName, ...(idea.labels || [])].filter(Boolean).slice(0, 5);
  return `<article class="card" draggable="true" data-id="${escapeHtml(idea.id)}">
    <div class="card-top"><h3>${escapeHtml(idea.title)}</h3><div class="score">${scoreOf(idea)}</div></div>
    ${idea.description ? `<p>${escapeHtml(short(idea.description))}</p>` : ''}
    <div class="meta">${tags.map(t => `<span class="pill">${escapeHtml(t)}</span>`).join('')}</div>
    <div class="metrics">
      <span>I <b>${idea.impact}</b></span><span>E <b>${idea.effort}</b></span><span>C <b>${idea.confidence}</b></span><span>U <b>${idea.urgency}</b></span>
    </div>
  </article>`;
}

function bindCards() {
  $$('.card').forEach(card => card.addEventListener('click', () => openDetail(card.dataset.id)));
}

function bindDrag() {
  $$('.card').forEach(card => {
    card.addEventListener('dragstart', event => {
      card.classList.add('dragging');
      event.dataTransfer.setData('text/plain', card.dataset.id);
    });
    card.addEventListener('dragend', () => card.classList.remove('dragging'));
  });
  $$('.lane').forEach(lane => {
    lane.addEventListener('dragover', event => { event.preventDefault(); lane.classList.add('drag-over'); });
    lane.addEventListener('dragleave', () => lane.classList.remove('drag-over'));
    lane.addEventListener('drop', async event => {
      event.preventDefault();
      lane.classList.remove('drag-over');
      const id = event.dataTransfer.getData('text/plain');
      const idea = state.ideas.find(i => i.id === id);
      const milestoneId = lane.dataset.milestone;
      if (!idea || idea.milestoneId === milestoneId) return;
      idea.milestoneId = milestoneId;
      idea.rank = Date.now() % 100000;
      renderBoard();
      try {
        const updated = await api(`/api/ideas/${id}`, { method: 'PATCH', body: { milestoneId, rank: idea.rank } });
        replaceIdea(updated);
        toast(`Moved to ${milestoneFor(milestoneId).name}`);
      } catch (error) { toast(error.message); await load(); }
    });
  });
}

function replaceIdea(idea) {
  const idx = state.ideas.findIndex(i => i.id === idea.id);
  if (idx >= 0) state.ideas[idx] = idea;
  else state.ideas.unshift(idea);
  state.ideas.sort((a, b) => b.score - a.score);
}

function openDetail(id) {
  const idea = state.ideas.find(i => i.id === id);
  if (!idea) return;
  state.selected = idea.id;
  detailForm.title.value = idea.title;
  detailForm.description.value = idea.description || '';
  detailForm.impact.value = idea.impact;
  detailForm.effort.value = idea.effort;
  detailForm.confidence.value = idea.confidence;
  detailForm.urgency.value = idea.urgency;
  detailForm.notes.value = idea.notes || '';
  detail.classList.add('open');
  detail.setAttribute('aria-hidden', 'false');
}
function closeDetail() {
  detail.classList.remove('open');
  detail.setAttribute('aria-hidden', 'true');
  state.selected = null;
}

form.addEventListener('submit', async event => {
  event.preventDefault();
  const fd = new FormData(form);
  const payload = Object.fromEntries(fd.entries());
  payload.labels = String(payload.labels || '').split(',').map(s => s.trim()).filter(Boolean);
  payload.source = payload.sourceName ? sourceKind({ sourceName: payload.sourceName }) : 'human';
  payload.status = payload.milestoneId === 'inbox' ? 'inbox' : 'planned';
  try {
    const idea = await api('/api/ideas', { method: 'POST', body: payload });
    replaceIdea(idea);
    form.reset();
    form.impact.value = 7; form.effort.value = 4; form.confidence.value = 6; form.urgency.value = 5;
    renderBoard();
    toast('Captured');
  } catch (error) { toast(error.message); }
});

detailForm.addEventListener('submit', async event => {
  event.preventDefault();
  if (!state.selected) return;
  const payload = Object.fromEntries(new FormData(detailForm).entries());
  try {
    const idea = await api(`/api/ideas/${state.selected}`, { method: 'PATCH', body: payload });
    replaceIdea(idea);
    closeDetail();
    renderBoard();
    toast('Saved');
  } catch (error) { toast(error.message); }
});

$('#archiveIdea').addEventListener('click', async () => {
  if (!state.selected) return;
  try {
    await api(`/api/ideas/${state.selected}`, { method: 'PATCH', body: { archived: true } });
    state.ideas = state.ideas.filter(i => i.id !== state.selected);
    closeDetail();
    renderBoard();
    toast('Archived');
  } catch (error) { toast(error.message); }
});

$('#closeDetail').addEventListener('click', closeDetail);
$('#refresh').addEventListener('click', load);
$('#search').addEventListener('input', event => { state.search = event.target.value; renderBoard(); });
$('#filters').addEventListener('click', event => {
  const button = event.target.closest('button[data-filter]');
  if (!button) return;
  state.filter = button.dataset.filter;
  $$('#filters button').forEach(b => b.classList.toggle('active', b === button));
  renderBoard();
});
$('#addMilestone').addEventListener('click', async () => {
  const name = prompt('Milestone name');
  if (!name) return;
  const horizon = prompt('Horizon / timing', 'Custom') || '';
  const colors = ['#8cf7ff', '#f8ff73', '#a78bfa', '#6ee7b7', '#ff5e7a'];
  try {
    const milestone = await api('/api/milestones', { method: 'POST', body: { name, horizon, color: colors[state.milestones.length % colors.length], position: state.milestones.length * 10 } });
    state.milestones.push(milestone);
    renderBoard();
    toast('Milestone added');
  } catch (error) { toast(error.message); }
});

document.addEventListener('keydown', event => {
  if (event.key === '/' && !['INPUT', 'TEXTAREA', 'SELECT'].includes(document.activeElement.tagName)) {
    event.preventDefault();
    $('#title').focus();
  }
  if (event.key === 'Escape') closeDetail();
});

async function load() {
  try {
    const data = await api('/api/bootstrap');
    state.ideas = data.ideas || [];
    state.milestones = data.milestones || [];
    state.activity = data.activity || [];
    renderBoard();
  } catch (error) {
    board.innerHTML = `<div class="empty">Backend is grumpy: ${escapeHtml(error.message)}</div>`;
  }
}

load();