import { apiRequest } from './api.js';
import { bindLogout, loadSession } from './auth.js';
import { searchRecipes } from './recipe-search.js';
import { bindScrollToTop } from './scroll-to-top.js';

const elements = {
  importForm: document.querySelector('#import-form'),
  importStatus: document.querySelector('#import-status'),
  previewSection: document.querySelector('#preview-section'),
  previewForm: document.querySelector('#preview-form'),
  recipeGrid: document.querySelector('#recipe-grid'),
  emptyLibrary: document.querySelector('#empty-library'),
  recipeCount: document.querySelector('#recipe-count'),
  recipeSearchInput: document.querySelector('#recipe-search-input'),
  clearRecipeSearch: document.querySelector('#clear-recipe-search'),
  tagFilter: document.querySelector('#tag-filter'),
  tagFilterOptions: document.querySelector('#tag-filter-options'),
  toggleTagFilter: document.querySelector('#toggle-tag-filter'),
  clearTagFilter: document.querySelector('#clear-tag-filter'),
  accessMenuButton: document.querySelector('#access-menu-button'),
  accessDrawer: document.querySelector('#access-drawer'),
  closeAccessDrawer: document.querySelector('#close-access-drawer'),
  drawerBackdrop: document.querySelector('#drawer-backdrop'),
  drawerUserName: document.querySelector('#drawer-user-name'),
  drawerUserEmail: document.querySelector('#drawer-user-email'),
  openAccessOverlay: document.querySelector('#open-access-overlay'),
  accessOverlay: document.querySelector('#access-overlay'),
  closeAccessOverlay: document.querySelector('#close-access-overlay'),
  accessOverlayBackdrop: document.querySelector('#access-overlay-backdrop'),
  accessForm: document.querySelector('#access-form'),
  accessEmail: document.querySelector('#access-email'),
  allowedEmailList: document.querySelector('#allowed-email-list'),
  scrollToTop: document.querySelector('#scroll-to-top'),
  toast: document.querySelector('#toast'),
};

let previewData = null;
let savedRecipes = [];
let currentUser = null;
let searchQuery = '';
let searchTimer = null;
let searchIsComposing = false;
let showAllTags = false;
const selectedTags = new Set();

const SEARCH_DEBOUNCE_MS = 180;
const VISIBLE_TAG_LIMIT = 6;

function escapeHtml(value) {
  return String(value ?? '')
    .replaceAll('&', '&')
    .replaceAll('<', '&lt;')
    .replaceAll('>', '&gt;')
    .replaceAll('"', '&quot;')
    .replaceAll("'", '&#039;');
}

function safeImageUrl(value) {
  if (!value) return '';
  try {
    const url = new URL(value, window.location.origin);
    if (url.protocol === 'http:' || url.protocol === 'https:') return url.href;
  } catch {
    return '';
  }
  return '';
}

function showToast(message) {
  elements.toast.textContent = message;
  elements.toast.hidden = false;
  window.setTimeout(() => { elements.toast.hidden = true; }, 3200);
}

function setStatus(message, kind = '') {
  elements.importStatus.textContent = message;
  elements.importStatus.className = `status ${kind}`.trim();
  elements.importStatus.hidden = false;
}

function recipeImage(recipe) {
  return recipe.imagePath ? `/media/${recipe.imagePath}` : '';
}

function normalizeTag(value) {
  return String(value ?? '').trim().replace(/^#+\s*/, '').replace(/\s+/g, ' ');
}

function tagKey(value) {
  return normalizeTag(value).toLocaleLowerCase();
}

function tagsForRecipe(recipe) {
  const tags = new Map();
  for (const value of recipe.tags ?? []) {
    const tag = normalizeTag(value);
    if (tag) tags.set(tagKey(tag), tag);
  }
  return tags;
}

function availableTags() {
  const tags = new Map();
  for (const recipe of savedRecipes) {
    for (const [key, label] of tagsForRecipe(recipe)) {
      const existing = tags.get(key);
      tags.set(key, { label: existing?.label ?? label, count: (existing?.count ?? 0) + 1 });
    }
  }
  return [...tags.entries()].sort(([, a], [, b]) => (
    b.count - a.count || a.label.localeCompare(b.label, 'ko')
  ));
}

function renderTagFilter() {
  const tags = availableTags();
  const selectedExtras = tags
    .slice(VISIBLE_TAG_LIMIT)
    .filter(([key]) => selectedTags.has(key));
  const visibleTags = showAllTags
    ? tags
    : [...tags.slice(0, VISIBLE_TAG_LIMIT), ...selectedExtras];
  const hiddenTagCount = tags.length - visibleTags.length;

  elements.tagFilter.hidden = tags.length === 0;
  elements.clearTagFilter.hidden = selectedTags.size === 0;
  elements.toggleTagFilter.hidden = showAllTags
    ? tags.length <= VISIBLE_TAG_LIMIT
    : hiddenTagCount === 0;
  elements.toggleTagFilter.textContent = showAllTags
    ? '접기'
    : `+ ${hiddenTagCount}개 더보기`;
  elements.toggleTagFilter.setAttribute('aria-expanded', String(showAllTags));
  elements.tagFilterOptions.innerHTML = visibleTags.map(([key, { label, count }]) => `
    <button class="tag-filter-button" type="button" data-tag="${escapeHtml(key)}"
            aria-pressed="${selectedTags.has(key)}">#${escapeHtml(label)} <span>${count}</span></button>
  `).join('');
}

function renderRecipes() {
  const tagFilteredRecipes = selectedTags.size === 0
    ? savedRecipes
    : savedRecipes.filter((recipe) => {
      const recipeTags = tagsForRecipe(recipe);
      return [...selectedTags].every((tag) => recipeTags.has(tag));
    });
  const matches = searchRecipes(tagFilteredRecipes, searchQuery);
  const hasFilters = selectedTags.size > 0 || searchQuery.length > 0;

  elements.recipeCount.textContent = hasFilters
    ? `${matches.length} / ${savedRecipes.length} RECIPES`
    : `${matches.length} RECIPES`;
  elements.emptyLibrary.hidden = matches.length !== 0;
  elements.emptyLibrary.innerHTML = savedRecipes.length === 0
    ? '아직 저장한 레시피가 없습니다.<br>첫 링크를 가져와 보세요.'
    : '검색 조건에 맞는 레시피가 없습니다.';
  elements.recipeGrid.innerHTML = matches.map(({ recipe, matchedIngredients }) => {
    const image = safeImageUrl(recipeImage(recipe));
    const tags = [...tagsForRecipe(recipe).values()];
    return `<a class="recipe-card" href="/recipe/${encodeURIComponent(recipe._id)}">
      <div class="recipe-card-image">
        ${image ? `<img src="${escapeHtml(image)}" alt="" loading="lazy">` : '<span>NO IMAGE</span>'}
      </div>
      <div class="recipe-card-body">
        <span class="platform-label">${escapeHtml(recipe.source.platform)}</span>
        <h3>${escapeHtml(recipe.title)}</h3>
        <p>${escapeHtml(recipe.summary || recipe.source.author || '')}</p>
        ${matchedIngredients.length
    ? `<p class="recipe-card-match">일치 재료: ${matchedIngredients.map(escapeHtml).join(', ')}</p>`
    : ''}
        ${tags.length ? `<div class="recipe-card-tags">${tags.map((tag) => `<span class="tag">#${escapeHtml(tag)}</span>`).join('')}</div>` : ''}
      </div>
    </a>`;
  }).join('');
}

async function loadRecipes() {
  const { recipes } = await apiRequest('/api/recipes');
  savedRecipes = recipes;
  const currentTagKeys = new Set(availableTags().map(([key]) => key));
  for (const tag of selectedTags) {
    if (!currentTagKeys.has(tag)) selectedTags.delete(tag);
  }
  renderTagFilter();
  renderRecipes();
}

async function loadAllowedEmails() {
  const { emails } = await apiRequest('/api/allowed-emails');
  elements.allowedEmailList.innerHTML = emails.map((email) => {
    const isCurrent = email === currentUser.email.toLowerCase();
    return `<div class="allowed-email-row">
      <span>${escapeHtml(email)}</span>
      ${isCurrent
    ? '<small>현재 관리자</small>'
    : `<button class="text-button danger" type="button" data-remove-email="${escapeHtml(email)}">삭제</button>`}
    </div>`;
  }).join('');
}

function updatePageLock() {
  document.body.classList.toggle(
    'drawer-open',
    !elements.accessDrawer.hidden || !elements.accessOverlay.hidden,
  );
}

function setAccessDrawerOpen(open) {
  elements.accessMenuButton.setAttribute('aria-expanded', String(open));
  elements.accessDrawer.setAttribute('aria-hidden', String(!open));
  elements.accessDrawer.hidden = !open;
  elements.drawerBackdrop.hidden = !open;
  updatePageLock();
  if (open) elements.closeAccessDrawer.focus();
  else elements.accessMenuButton.focus();
}

function setAccessOverlayOpen(open) {
  elements.accessOverlay.setAttribute('aria-hidden', String(!open));
  elements.accessOverlay.hidden = !open;
  elements.accessOverlayBackdrop.hidden = !open;
  updatePageLock();
  if (open) elements.accessEmail.focus();
  else elements.accessMenuButton.focus();
}

function ingredientGroupTemplate(group, groupIndex) {
  return `<fieldset class="editor-group" data-ingredient-group>
    <div class="editor-group-heading">
      <input aria-label="재료 그룹 이름" data-group-name value="${escapeHtml(group.name)}" required>
      <button class="text-button danger" type="button" data-action="remove-group" data-group="${groupIndex}">그룹 삭제</button>
    </div>
    <div class="ingredient-list">
      ${group.items.map((item, itemIndex) => `<div class="ingredient-row" data-ingredient-item>
        <input aria-label="재료 이름" data-item-name value="${escapeHtml(item.name)}" placeholder="재료" required>
        <input aria-label="재료 수량" data-item-amount value="${escapeHtml(item.amount || '')}" placeholder="수량">
        <button class="icon-button" type="button" aria-label="재료 삭제" data-action="remove-item" data-group="${groupIndex}" data-item="${itemIndex}">×</button>
      </div>`).join('')}
    </div>
    <button class="text-button" type="button" data-action="add-item" data-group="${groupIndex}">+ 재료 추가</button>
  </fieldset>`;
}

function renderPreview() {
  const { recipe, imagePreviewUrl, source } = previewData;
  const image = safeImageUrl(imagePreviewUrl);
  elements.previewForm.innerHTML = `
    <div class="preview-layout">
      <div class="preview-image">
        ${image ? `<img src="${escapeHtml(image)}" alt="가져온 레시피 미리보기">` : '<span>NO IMAGE</span>'}
        <span class="platform-label">${escapeHtml(source.platform)}</span>
      </div>
      <div class="editor-fields">
        <label>제목<input id="recipe-title" value="${escapeHtml(recipe.title)}" required></label>
        <label>한 줄 설명<textarea id="recipe-summary" rows="2">${escapeHtml(recipe.summary || '')}</textarea></label>
        <label>분량<input id="recipe-servings" value="${escapeHtml(recipe.servings || '')}"></label>
      </div>
    </div>
    <div class="editor-section">
      <div class="editor-section-heading"><h3>재료</h3><button class="text-button" type="button" data-action="add-group">+ 그룹 추가</button></div>
      <div id="ingredient-groups">${recipe.ingredientGroups.map(ingredientGroupTemplate).join('')}</div>
    </div>
    <div class="editor-section">
      <div class="editor-section-heading"><h3>조리 순서</h3><button class="text-button" type="button" data-action="add-step">+ 단계 추가</button></div>
      <div id="step-list">${recipe.steps.map((step, index) => `<div class="step-row" data-step>
        <span>${index + 1}</span>
        <textarea data-step-text rows="2" required>${escapeHtml(step.text)}</textarea>
        <input data-step-time type="number" min="0" step="1" value="${step.timestampSec ?? ''}" placeholder="초">
        <button class="icon-button" type="button" aria-label="단계 삭제" data-action="remove-step" data-step-index="${index}">×</button>
      </div>`).join('')}</div>
    </div>
    <div class="editor-fields two-column">
      <label>팁 (한 줄에 하나)<textarea id="recipe-tips" rows="3">${escapeHtml(recipe.tips.join('\n'))}</textarea></label>
      <label>태그 (표준 태그 중 최대 3개, 쉼표로 구분)<textarea id="recipe-tags" rows="3">${escapeHtml(recipe.tags.join(', '))}</textarea></label>
    </div>
    <div class="form-actions">
      <button class="button button-primary" type="submit">아틀라스에 저장</button>
    </div>`;
  elements.previewSection.hidden = false;
  elements.previewSection.scrollIntoView({ behavior: 'smooth', block: 'start' });
}

function readPreviewForm() {
  const ingredientGroups = [...elements.previewForm.querySelectorAll('[data-ingredient-group]')].map((group) => ({
    name: group.querySelector('[data-group-name]').value.trim(),
    items: [...group.querySelectorAll('[data-ingredient-item]')].map((item) => ({
      name: item.querySelector('[data-item-name]').value.trim(),
      amount: item.querySelector('[data-item-amount]').value.trim() || null,
    })),
  }));
  const steps = [...elements.previewForm.querySelectorAll('[data-step]')].map((step, index) => {
    const timestamp = step.querySelector('[data-step-time]').value;
    return {
      order: index + 1,
      text: step.querySelector('[data-step-text]').value.trim(),
      timestampSec: timestamp === '' ? null : Number(timestamp),
    };
  });

  return {
    title: document.querySelector('#recipe-title').value.trim(),
    summary: document.querySelector('#recipe-summary').value.trim() || null,
    servings: document.querySelector('#recipe-servings').value.trim() || null,
    ingredientGroups,
    steps,
    tips: document.querySelector('#recipe-tips').value.split(/\r?\n/).map((item) => item.trim()).filter(Boolean),
    tags: document.querySelector('#recipe-tags').value.split(',').map((item) => item.trim()).filter(Boolean),
  };
}

function mutatePreview(action, button) {
  previewData.recipe = readPreviewForm();
  const groupIndex = Number(button.dataset.group);
  const itemIndex = Number(button.dataset.item);
  const stepIndex = Number(button.dataset.stepIndex);

  if (action === 'add-group') previewData.recipe.ingredientGroups.push({ name: '재료', items: [] });
  if (action === 'remove-group') previewData.recipe.ingredientGroups.splice(groupIndex, 1);
  if (action === 'add-item') previewData.recipe.ingredientGroups[groupIndex].items.push({ name: '', amount: null });
  if (action === 'remove-item') previewData.recipe.ingredientGroups[groupIndex].items.splice(itemIndex, 1);
  if (action === 'add-step') previewData.recipe.steps.push({ order: previewData.recipe.steps.length + 1, text: '', timestampSec: null });
  if (action === 'remove-step') previewData.recipe.steps.splice(stepIndex, 1);
  previewData.recipe.steps.forEach((step, index) => { step.order = index + 1; });
  renderPreview();
}

elements.importForm.addEventListener('submit', async (event) => {
  event.preventDefault();
  const button = elements.importForm.querySelector('button');
  button.disabled = true;
  const timers = [
    window.setTimeout(() => setStatus('콘텐츠 가져오는 중...'), 500),
    window.setTimeout(() => setStatus('레시피 분석 중...'), 1600),
  ];
  setStatus('링크 확인 중...');

  try {
    const url = new FormData(elements.importForm).get('url');
    previewData = await apiRequest('/api/import/preview', {
      method: 'POST',
      body: JSON.stringify({ url }),
    });
    timers.forEach(window.clearTimeout);
    setStatus('분석 완료', 'success');
    renderPreview();
  } catch (error) {
    timers.forEach(window.clearTimeout);
    setStatus(error.message, 'error');
  } finally {
    button.disabled = false;
  }
});

elements.previewForm.addEventListener('click', (event) => {
  const button = event.target.closest('[data-action]');
  if (button) mutatePreview(button.dataset.action, button);
});

elements.previewForm.addEventListener('submit', async (event) => {
  event.preventDefault();
  const button = elements.previewForm.querySelector('[type="submit"]');
  button.disabled = true;
  try {
    const { recipe } = await apiRequest('/api/recipes', {
      method: 'POST',
      body: JSON.stringify({
        recipe: readPreviewForm(),
        source: previewData.source,
        imagePreviewUrl: previewData.imagePreviewUrl,
      }),
    });
    previewData = null;
    elements.previewSection.hidden = true;
    elements.importForm.reset();
    showToast(`${recipe.title} 레시피를 저장했습니다.`);
    await loadRecipes();
  } catch (error) {
    showToast(error.message);
  } finally {
    button.disabled = false;
  }
});

document.querySelector('#cancel-preview').addEventListener('click', () => {
  previewData = null;
  elements.previewSection.hidden = true;
});

elements.tagFilterOptions.addEventListener('click', (event) => {
  const button = event.target.closest('[data-tag]');
  if (!button) return;
  const key = button.dataset.tag;
  if (selectedTags.has(key)) selectedTags.delete(key);
  else selectedTags.add(key);
  renderTagFilter();
  renderRecipes();
});

elements.clearTagFilter.addEventListener('click', () => {
  selectedTags.clear();
  showAllTags = false;
  renderTagFilter();
  renderRecipes();
});

elements.toggleTagFilter.addEventListener('click', () => {
  showAllTags = !showAllTags;
  renderTagFilter();
});

function scheduleRecipeSearch() {
  const nextQuery = elements.recipeSearchInput.value.trim();
  elements.clearRecipeSearch.hidden = nextQuery.length === 0;
  window.clearTimeout(searchTimer);
  searchTimer = window.setTimeout(() => {
    searchQuery = nextQuery;
    searchTimer = null;
    renderRecipes();
  }, SEARCH_DEBOUNCE_MS);
}

elements.recipeSearchInput.addEventListener('compositionstart', () => {
  searchIsComposing = true;
});

elements.recipeSearchInput.addEventListener('compositionend', () => {
  searchIsComposing = false;
  scheduleRecipeSearch();
});

elements.recipeSearchInput.addEventListener('input', (event) => {
  elements.clearRecipeSearch.hidden = elements.recipeSearchInput.value.trim().length === 0;
  if (searchIsComposing || event.isComposing) return;
  scheduleRecipeSearch();
});

elements.clearRecipeSearch.addEventListener('click', () => {
  window.clearTimeout(searchTimer);
  searchTimer = null;
  elements.recipeSearchInput.value = '';
  searchQuery = '';
  elements.clearRecipeSearch.hidden = true;
  elements.recipeSearchInput.focus();
  renderRecipes();
});

elements.accessMenuButton.addEventListener('click', () => {
  setAccessDrawerOpen(true);
});

elements.openAccessOverlay.addEventListener('click', async () => {
  setAccessDrawerOpen(false);
  setAccessOverlayOpen(true);
  try {
    await loadAllowedEmails();
  } catch (error) {
    showToast(error.message);
  }
});

elements.closeAccessDrawer.addEventListener('click', () => setAccessDrawerOpen(false));
elements.drawerBackdrop.addEventListener('click', () => setAccessDrawerOpen(false));
elements.closeAccessOverlay.addEventListener('click', () => setAccessOverlayOpen(false));
elements.accessOverlayBackdrop.addEventListener('click', () => setAccessOverlayOpen(false));
document.addEventListener('keydown', (event) => {
  if (event.key !== 'Escape') return;
  if (!elements.accessOverlay.hidden) setAccessOverlayOpen(false);
  else if (!elements.accessDrawer.hidden) setAccessDrawerOpen(false);
});

elements.accessForm.addEventListener('submit', async (event) => {
  event.preventDefault();
  const button = elements.accessForm.querySelector('button');
  button.disabled = true;
  try {
    const email = new FormData(elements.accessForm).get('email');
    await apiRequest('/api/allowed-emails', {
      method: 'POST',
      body: JSON.stringify({ email }),
    });
    elements.accessForm.reset();
    showToast(`${email} 계정을 추가했습니다.`);
    await loadAllowedEmails();
  } catch (error) {
    showToast(error.message);
  } finally {
    button.disabled = false;
  }
});

elements.allowedEmailList.addEventListener('click', async (event) => {
  const button = event.target.closest('[data-remove-email]');
  if (!button) return;
  button.disabled = true;
  try {
    await apiRequest(`/api/allowed-emails/${encodeURIComponent(button.dataset.removeEmail)}`, {
      method: 'DELETE',
    });
    showToast(`${button.dataset.removeEmail} 계정을 삭제했습니다.`);
    await loadAllowedEmails();
  } catch (error) {
    showToast(error.message);
    button.disabled = false;
  }
});

bindLogout();
bindScrollToTop(elements.scrollToTop);
currentUser = await loadSession();
elements.drawerUserName.textContent = currentUser.name || currentUser.email;
elements.drawerUserEmail.textContent = currentUser.email;
await loadRecipes();
if (currentUser.canManageAccess) {
  elements.openAccessOverlay.hidden = false;
}