// Mythic Oracle — NPC tracker

import { getActiveCampaign } from './app.js';
import { getNpcs, createNpc, updateNpc, deleteNpc } from './api.js';

const NO_CAMPAIGN_MESSAGE = 'Select or create a campaign to use the NPC tracker.';
const ALIVE_STATUSES = ['alive', 'dead', 'unknown', 'missing'];

const SECTIONS = [
  {
    title: 'Identity',
    fields: [
      { key: 'name', label: 'Name', type: 'text' },
      { key: 'description', label: 'Description', type: 'textarea' },
      { key: 'appearance', label: 'Appearance', type: 'textarea' },
      { key: 'age', label: 'Age', type: 'text' },
      { key: 'gender', label: 'Gender', type: 'text' },
      { key: 'pronouns', label: 'Pronouns', type: 'text' },
      { key: 'voice', label: 'Voice', type: 'text' },
      { key: 'distinguishing_features', label: 'Distinguishing Features', type: 'textarea' },
    ],
  },
  {
    title: 'Social',
    fields: [
      { key: 'faction', label: 'Faction', type: 'text' },
      { key: 'occupation', label: 'Occupation', type: 'text' },
      { key: 'social_status', label: 'Social Status', type: 'text' },
      { key: 'relationship_to_pc', label: 'Relationship to PC', type: 'text' },
      { key: 'loyalty', label: 'Loyalty', type: 'text' },
    ],
  },
  {
    title: 'Personality',
    fields: [
      { key: 'personality_traits', label: 'Personality Traits', type: 'textarea' },
      { key: 'fears', label: 'Fears', type: 'textarea' },
      { key: 'desires', label: 'Desires', type: 'textarea' },
      { key: 'secrets', label: 'Secrets', type: 'textarea' },
      { key: 'motivations', label: 'Motivations', type: 'textarea' },
    ],
  },
  {
    title: 'Narrative',
    fields: [
      { key: 'first_encountered', label: 'First Encountered', type: 'text' },
      { key: 'last_seen', label: 'Last Seen', type: 'text' },
      { key: 'current_location', label: 'Current Location', type: 'text' },
      { key: 'current_goal', label: 'Current Goal', type: 'textarea' },
      { key: 'role_in_threads', label: 'Role in Threads', type: 'textarea' },
    ],
  },
  {
    title: 'Status',
    fields: [
      { key: 'alive_status', label: 'Alive Status', type: 'select' },
      { key: 'disposition', label: 'Disposition', type: 'text' },
    ],
  },
];

const NOTES_FIELD = { key: 'notes', label: 'Notes', type: 'textarea' };

const ALL_FIELDS = SECTIONS.flatMap((section) => section.fields).concat(NOTES_FIELD);

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

let npcsCache = [];
let aliveFilter = 'all';
let dispositionFilter = 'all';
let expandedId = null;
let editingNpcId = null;

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

function dispositionDisplay(npc) {
  return npc.disposition || 'Unknown';
}

function renderNoCampaign() {
  container.innerHTML = '';
  const msg = document.createElement('div');
  msg.className = 'npcs-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="npcs-header">
      <h2 class="npcs-title">NPCs</h2>
      <button class="npc-create-btn" id="npcCreateBtn" type="button">+ New NPC</button>
    </div>
    <div class="npc-filters">
      <div class="npc-alive-tabs" id="npcAliveTabs">
        <button class="npc-tab active" data-alive="all" type="button">All</button>
        <button class="npc-tab" data-alive="alive" type="button">Alive</button>
        <button class="npc-tab" data-alive="dead" type="button">Dead</button>
        <button class="npc-tab" data-alive="unknown" type="button">Unknown</button>
        <button class="npc-tab" data-alive="missing" type="button">Missing</button>
      </div>
      <select class="npc-disposition-filter" id="npcDispositionFilter">
        <option value="all">All Dispositions</option>
      </select>
    </div>
    <div class="npc-list" id="npcList"></div>
    <div class="modal-overlay" id="npcModalOverlay">
      <div class="modal">
        <h3 class="modal-title" id="npcModalTitle">New NPC</h3>
        <div class="modal-body" id="npcModalBody"></div>
        <div class="modal-actions">
          <button class="clear-btn" id="npcCancelBtn" type="button">Cancel</button>
          <button class="roll-btn" id="npcSaveBtn" type="button">Save NPC</button>
        </div>
      </div>
    </div>
  `;
  container.dataset.skeleton = 'true';
  bindSkeletonEvents();
}

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

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

  container.querySelector('#npcDispositionFilter').addEventListener('change', (event) => {
    dispositionFilter = event.target.value;
    expandedId = null;
    renderList();
  });

  container.querySelector('#npcCancelBtn').addEventListener('click', closeModal);
  container.querySelector('#npcSaveBtn').addEventListener('click', saveModal);
  container.querySelector('#npcModalOverlay').addEventListener('click', (event) => {
    if (event.target.id === 'npcModalOverlay') closeModal();
  });
}

function renderDispositionOptions() {
  const select = container.querySelector('#npcDispositionFilter');
  const distinct = [...new Set(npcsCache.map((npc) => dispositionDisplay(npc)))].sort((a, b) =>
    a.localeCompare(b)
  );

  select.innerHTML = '';

  const allOption = document.createElement('option');
  allOption.value = 'all';
  allOption.textContent = 'All Dispositions';
  select.appendChild(allOption);

  distinct.forEach((value) => {
    const option = document.createElement('option');
    option.value = value;
    option.textContent = value;
    select.appendChild(option);
  });

  if (dispositionFilter !== 'all' && !distinct.includes(dispositionFilter)) {
    dispositionFilter = 'all';
  }
  select.value = dispositionFilter;
}

function buildEmptyMessage() {
  const aliveText = aliveFilter === 'all' ? '' : `${statusLabel(aliveFilter)} `;
  if (dispositionFilter === 'all') {
    return `No ${aliveText}NPCs.`;
  }
  return `No ${aliveText}NPCs with disposition "${dispositionFilter}".`;
}

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

  const filtered = npcsCache.filter((npc) => {
    const matchesAlive = aliveFilter === 'all' || npc.alive_status === aliveFilter;
    const matchesDisposition = dispositionFilter === 'all' || dispositionDisplay(npc) === dispositionFilter;
    return matchesAlive && matchesDisposition;
  });

  if (filtered.length === 0) {
    const empty = document.createElement('div');
    empty.className = 'npc-empty';
    empty.textContent = npcsCache.length === 0 ? 'No NPCs yet.' : buildEmptyMessage();
    listEl.appendChild(empty);
    return;
  }

  filtered.forEach((npc) => {
    listEl.appendChild(buildNpcCard(npc));
  });
}

function buildNpcCard(npc) {
  const card = document.createElement('div');
  card.className = 'npc-card';

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

  const nameSpan = document.createElement('span');
  nameSpan.className = 'npc-card-name';
  nameSpan.textContent = npc.name;

  const badges = document.createElement('span');
  badges.className = 'npc-card-badges';

  const dispositionBadge = document.createElement('span');
  dispositionBadge.className = 'npc-disposition-badge';
  dispositionBadge.textContent = dispositionDisplay(npc);

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

  badges.append(dispositionBadge, aliveBadge);
  header.append(nameSpan, badges);
  header.addEventListener('click', () => {
    expandedId = expandedId === npc.id ? null : npc.id;
    renderList();
  });
  card.appendChild(header);

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

  return card;
}

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

  SECTIONS.forEach((section) => {
    const sectionEl = document.createElement('div');
    sectionEl.className = 'npc-section';

    const titleEl = document.createElement('div');
    titleEl.className = 'npc-section-title';
    titleEl.textContent = section.title;
    sectionEl.appendChild(titleEl);

    section.fields.forEach(({ key, label }) => {
      sectionEl.appendChild(buildFieldRow(label, key === 'alive_status' ? statusLabel(npc.alive_status) : npc[key]));
    });

    detail.appendChild(sectionEl);
  });

  const notesSection = document.createElement('div');
  notesSection.className = 'npc-section';
  const notesTitle = document.createElement('div');
  notesTitle.className = 'npc-section-title';
  notesTitle.textContent = NOTES_FIELD.label;
  notesSection.appendChild(notesTitle);
  notesSection.appendChild(buildFieldRow(null, npc.notes, true));
  detail.appendChild(notesSection);

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

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

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

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

  return detail;
}

function buildFieldRow(label, value, valueOnly = false) {
  const row = document.createElement('div');
  row.className = 'npc-field';

  if (!valueOnly) {
    const labelEl = document.createElement('span');
    labelEl.className = 'npc-field-label';
    labelEl.textContent = label;
    row.appendChild(labelEl);
  }

  const valueEl = document.createElement('span');
  valueEl.className = 'npc-field-value';
  valueEl.textContent = value || '—';
  row.appendChild(valueEl);

  return row;
}

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

  SECTIONS.forEach((section) => {
    body.appendChild(buildModalSectionTitle(section.title));
    section.fields.forEach((field) => {
      body.appendChild(buildModalField(field, values));
    });
  });

  body.appendChild(buildModalSectionTitle(NOTES_FIELD.label));
  body.appendChild(buildModalField(NOTES_FIELD, values, true));
}

function buildModalSectionTitle(title) {
  const titleEl = document.createElement('div');
  titleEl.className = 'modal-section-title';
  titleEl.textContent = title;
  return titleEl;
}

function buildModalField({ key, label, type }, values, hideLabel = false) {
  const group = document.createElement('div');
  group.className = 'modal-field';

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

  let input;
  if (type === 'select') {
    input = document.createElement('select');
    input.className = 'modal-select';
    ALIVE_STATUSES.forEach((status) => {
      const option = document.createElement('option');
      option.value = status;
      option.textContent = statusLabel(status);
      input.appendChild(option);
    });
    input.value = values.alive_status || 'alive';
  } 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 = `npc-field-${key}`;

  group.appendChild(input);
  return group;
}

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

function openCreateModal() {
  editingNpcId = null;
  container.querySelector('#npcModalTitle').textContent = 'New NPC';
  buildModalForm({});
  showModal();
}

function openEditModal(npc) {
  editingNpcId = npc.id;
  container.querySelector('#npcModalTitle').textContent = 'Edit NPC';
  buildModalForm(npc);
  showModal();
}

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

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

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

  const data = collectFormData();
  if (!data.name) {
    alert('Name is required.');
    return;
  }
  if (!data.alive_status) data.alive_status = 'alive';
  if (!data.disposition) data.disposition = 'unknown';

  try {
    if (editingNpcId === null) {
      await createNpc(campaign.id, data);
    } else {
      await updateNpc(campaign.id, editingNpcId, data);
    }
    closeModal();
    await loadAndRender();
  } catch (err) {
    alert(err.message);
  }
}

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

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

  await deleteNpc(campaign.id, npc.id);
  expandedId = null;
  await loadAndRender();
}

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

  ensureSkeleton();
  npcsCache = await getNpcs(campaign.id);
  renderDispositionOptions();
  renderList();
}

function init() {
  loadAndRender();

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

document.addEventListener('DOMContentLoaded', init);