// Mythic Oracle — thread tracker

import { getActiveCampaign } from './app.js';
import { getThreads, createThread, updateThread, deleteThread } from './api.js';

const NO_CAMPAIGN_MESSAGE = 'Select or create a campaign to use the thread tracker.';
const STATUSES = ['active', 'resolved', 'suspended', 'complicated'];

const FIELD_DEFS = [
  { key: 'title', label: 'Title', type: 'text' },
  { key: 'status', label: 'Status', type: 'select' },
  { key: 'notes', label: 'Notes', type: 'textarea' },
  { key: 'related_npcs', label: 'Related NPCs', type: 'text' },
  { key: 'related_location', label: 'Related Location', type: 'text' },
  { key: 'origin', label: 'Origin', type: 'textarea' },
  { key: 'stakes', label: 'Stakes', type: 'textarea' },
  { key: 'last_development', label: 'Last Development', type: 'textarea' },
  { key: 'next_beat', label: 'Next Beat', type: 'textarea' },
  { key: 'suspected_resolution', label: 'Suspected Resolution', type: 'textarea' },
];

const container = document.getElementById('view-threads');

let threadsCache = [];
let activeTab = 'active';
let expandedId = null;
let editingThreadId = null;

function statusLabel(status) {
  return status.charAt(0).toUpperCase() + status.slice(1);
}

function renderNoCampaign() {
  container.innerHTML = '';
  const msg = document.createElement('div');
  msg.className = 'threads-empty-state';
  msg.textContent = NO_CAMPAIGN_MESSAGE;
  container.appendChild(msg);
  container.dataset.skeleton = 'false';
}

function ensureSkeleton() {
  if (container.dataset.skeleton === 'true') return;

  container.innerHTML = `
    <div class="threads-header">
      <h2 class="threads-title">Threads</h2>
      <button class="thread-create-btn" id="threadCreateBtn" type="button">+ New Thread</button>
    </div>
    <div class="thread-tabs" id="threadTabs">
      <button class="thread-tab active" data-status="active" type="button">Active</button>
      <button class="thread-tab" data-status="resolved" type="button">Resolved</button>
      <button class="thread-tab" data-status="suspended" type="button">Suspended</button>
      <button class="thread-tab" data-status="complicated" type="button">Complicated</button>
    </div>
    <div class="thread-list" id="threadList"></div>
    <div class="modal-overlay" id="threadModalOverlay">
      <div class="modal">
        <h3 class="modal-title" id="threadModalTitle">New Thread</h3>
        <div class="modal-body" id="threadModalBody"></div>
        <div class="modal-actions">
          <button class="clear-btn" id="threadCancelBtn" type="button">Cancel</button>
          <button class="roll-btn" id="threadSaveBtn" type="button">Save Thread</button>
        </div>
      </div>
    </div>
  `;
  container.dataset.skeleton = 'true';
  bindSkeletonEvents();
}

function bindSkeletonEvents() {
  container.querySelector('#threadCreateBtn').addEventListener('click', openCreateModal);

  container.querySelectorAll('.thread-tab').forEach((tab) => {
    tab.addEventListener('click', () => {
      if (tab.dataset.status === activeTab) return;
      activeTab = tab.dataset.status;
      container.querySelectorAll('.thread-tab').forEach((t) => t.classList.toggle('active', t === tab));
      expandedId = null;
      renderList();
    });
  });

  container.querySelector('#threadCancelBtn').addEventListener('click', closeModal);
  container.querySelector('#threadSaveBtn').addEventListener('click', saveModal);
  container.querySelector('#threadModalOverlay').addEventListener('click', (event) => {
    if (event.target.id === 'threadModalOverlay') closeModal();
  });
}

function renderList() {
  const listEl = container.querySelector('#threadList');
  listEl.innerHTML = '';

  const filtered = threadsCache.filter((thread) => thread.status === activeTab);

  if (filtered.length === 0) {
    const empty = document.createElement('div');
    empty.className = 'thread-empty';
    empty.textContent = `No ${activeTab} threads.`;
    listEl.appendChild(empty);
    return;
  }

  filtered.forEach((thread) => {
    listEl.appendChild(buildThreadCard(thread));
  });
}

function buildThreadCard(thread) {
  const card = document.createElement('div');
  card.className = 'thread-card';

  const header = document.createElement('button');
  header.type = 'button';
  header.className = 'thread-card-header';

  const titleSpan = document.createElement('span');
  titleSpan.className = 'thread-card-title';
  titleSpan.textContent = thread.title;

  const badge = document.createElement('span');
  badge.className = `thread-status-badge thread-status-${thread.status}`;
  badge.textContent = statusLabel(thread.status);

  header.append(titleSpan, badge);
  header.addEventListener('click', () => {
    expandedId = expandedId === thread.id ? null : thread.id;
    renderList();
  });
  card.appendChild(header);

  if (expandedId === thread.id) {
    card.classList.add('expanded');
    card.appendChild(buildThreadDetail(thread));
  }

  return card;
}

function buildThreadDetail(thread) {
  const detail = document.createElement('div');
  detail.className = 'thread-card-detail';

  FIELD_DEFS.forEach(({ key, label }) => {
    const row = document.createElement('div');
    row.className = 'thread-field';

    const labelEl = document.createElement('span');
    labelEl.className = 'thread-field-label';
    labelEl.textContent = label;

    const valueEl = document.createElement('span');
    valueEl.className = 'thread-field-value';
    valueEl.textContent = key === 'status' ? statusLabel(thread.status) : (thread[key] || '—');

    row.append(labelEl, valueEl);
    detail.appendChild(row);
  });

  const actions = document.createElement('div');
  actions.className = 'thread-card-actions';

  const editBtn = document.createElement('button');
  editBtn.type = 'button';
  editBtn.className = 'thread-edit-btn';
  editBtn.textContent = 'Edit';
  editBtn.addEventListener('click', () => openEditModal(thread));

  const deleteBtn = document.createElement('button');
  deleteBtn.type = 'button';
  deleteBtn.className = 'thread-delete-btn';
  deleteBtn.textContent = 'Delete';
  deleteBtn.addEventListener('click', () => handleDelete(thread));

  actions.append(editBtn, deleteBtn);
  detail.appendChild(actions);

  return detail;
}

function buildModalForm(values) {
  const body = container.querySelector('#threadModalBody');
  body.innerHTML = '';

  FIELD_DEFS.forEach(({ key, label, type }) => {
    const group = document.createElement('div');
    group.className = 'modal-field';

    const labelEl = document.createElement('label');
    labelEl.className = 'modal-field-label';
    labelEl.textContent = label;
    labelEl.setAttribute('for', `thread-field-${key}`);
    group.appendChild(labelEl);

    let input;
    if (type === 'select') {
      input = document.createElement('select');
      input.className = 'modal-select';
      STATUSES.forEach((status) => {
        const option = document.createElement('option');
        option.value = status;
        option.textContent = statusLabel(status);
        input.appendChild(option);
      });
      input.value = values.status || 'active';
    } else if (type === 'textarea') {
      input = document.createElement('textarea');
      input.className = 'modal-textarea';
      input.rows = 3;
      input.value = values[key] || '';
    } else {
      input = document.createElement('input');
      input.type = 'text';
      input.className = 'modal-input';
      input.value = values[key] || '';
    }
    input.id = `thread-field-${key}`;

    group.appendChild(input);
    body.appendChild(group);
  });
}

function collectFormData() {
  const data = {};
  FIELD_DEFS.forEach(({ key }) => {
    const el = container.querySelector(`#thread-field-${key}`);
    const value = el.value;
    data[key] = value.trim() === '' ? null : value;
  });
  return data;
}

function openCreateModal() {
  editingThreadId = null;
  container.querySelector('#threadModalTitle').textContent = 'New Thread';
  buildModalForm({});
  showModal();
}

function openEditModal(thread) {
  editingThreadId = thread.id;
  container.querySelector('#threadModalTitle').textContent = 'Edit Thread';
  buildModalForm(thread);
  showModal();
}

function showModal() {
  container.querySelector('#threadModalOverlay').classList.add('open');
}

function closeModal() {
  container.querySelector('#threadModalOverlay').classList.remove('open');
}

async function saveModal() {
  const campaign = getActiveCampaign();
  if (!campaign) return;

  const data = collectFormData();
  if (!data.title) {
    alert('Title is required.');
    return;
  }
  if (!data.status) data.status = 'active';

  try {
    if (editingThreadId === null) {
      await createThread(campaign.id, data);
    } else {
      await updateThread(campaign.id, editingThreadId, data);
    }
    closeModal();
    await loadAndRender();
  } catch (err) {
    alert(err.message);
  }
}

async function handleDelete(thread) {
  const confirmed = confirm(`Delete "${thread.title}"? This cannot be undone.`);
  if (!confirmed) return;

  const campaign = getActiveCampaign();
  if (!campaign) return;

  await deleteThread(campaign.id, thread.id);
  expandedId = null;
  await loadAndRender();
}

async function loadAndRender() {
  const campaign = getActiveCampaign();
  if (!campaign) {
    renderNoCampaign();
    return;
  }

  ensureSkeleton();
  threadsCache = await getThreads(campaign.id);
  renderList();
}

function init() {
  loadAndRender();

  const navBtn = document.querySelector('.nav-item[data-view="threads"]');
  if (navBtn) {
    navBtn.addEventListener('click', () => loadAndRender());
  }
}

document.addEventListener('DOMContentLoaded', init);