import dayjs from 'dayjs';

const allTypes = ['Page', 'Post'];

async function ensurePagefind() {
  if (window.pagefind) return Promise.resolve(window.pagefind);
  return import('/pagefind/pagefind.js')
    .then(function (mod) {
      mod.options({
        highlightParam: 'highlight'
      });
      window.pagefind = mod;
      return window.pagefind || mod.pagefind || mod.default || mod;
    })
    .catch(function () {
      return new Promise(function (resolve) {
        const s = document.createElement('script');
        s.src = '/pagefind/pagefind.js';
        s.type = 'module';
        s.onload = function () {
          resolve(window.pagefind);
        };
        s.onerror = function () {
          resolve(undefined);
        };
        document.head.appendChild(s);
      });
    });
}

function renderItem(item) {
  let {
    url,
    excerpt,
    meta: {author, date, title, type, image, image_alt, tag}
  } = item;

  //debugging
  console.log(item.meta);

  // create date
  const dateHTML = date ? `<span slot="date">${dayjs(date).format('MMMM D, YYYY') }</span>` : '';

  // create hero image preview
  let imageHTML = '';
            if (item.meta.image) {
              // Try to get alt text from Pagefind metadata, fallback to title, then generic text
              const altText = item.meta['image[alt]'] || item.meta.title || 'Search result image';
              imageHTML = `<picture><img src="${item.meta.image}" alt="${altText}"></picture>`;
            }

// create tags
            let tagsHTML = '';
            if (item.filters && item.filters.tag && item.filters.tag.length > 0) {
                tagsHTML = `
                    
                            ${item.filters.tag.map(tag => `<span class="button" data-small-button>${tag}</span>`).join('')}
                    
                `;
            }
            
  let variant;
  switch (type) {
    case 'Page':
      variant = 'secondary';
      break;
    default:
      variant = 'primary';
      break;
  }

  //output the search result
  return `
<custom-card clickable class="mt-s-m">
  ${imageHTML}
  <h2 slot="headline" class="text-step-2">
    <a href="${url}">${title}</a>
  </h2>
  ${dateHTML}
  <div slot="type" class="meta | cluster gutter-xs-s" webc:nokeep>
    <span class="button" data-small-button data-button-variant=${variant}>${type}</span> ${tagsHTML}
  </div>
  <div slot="content" webc:nokeep>${excerpt}</div>
</custom-card>
`;
}

function renderItems(q, items) {
  var results = items.length == 1 ? 'result' : 'results';
  document.querySelector('#results-count').innerHTML = `${items.length} ${results} for ${q}`;

  let content = items.map(renderItem).join('');
  document.querySelector('#results').innerHTML = content;
}

function doSearch(isPopEvent = false) {
  let form = document.querySelector('form#search');

  // Clear current content
  document.querySelector('#results').innerHTML = '';
  document.querySelector('#results-count').innerHTML = '';

  // Get form data
  let formData = new FormData(form);
  let q = formData.get('q');

  let types = [];
  allTypes.map(possibleFilter => {
    if (formData.get(possibleFilter)) {
      types.push(possibleFilter);
    }
  });

  let tags = [];
  formData.getAll('tag').forEach(tag => {
    if (tag) tags.push(tag);
  });

  // Only do a search if there's a query
  if (q) {
    // Update url unless it's a popstate event
    if (!isPopEvent) {
      setWindowLocation(q, types, tags, isPopEvent);
    }

    // Show results area
    form.querySelector('#filter-and-results').classList.remove('filter-and-results--hidden');

    // Find and display results
    window.pagefind
      .search(q, {
        filters: {
          type: { any: types },
          tag: { any: tags }
      }
    })

      .then(search =>
        Promise.all(search.results.map(result => result.data()))
          .then(data => renderItems(q, data))
          .catch(console.error)
      )
      .catch(console.error);
  }
}

function setWindowLocation(q, types, tags) {
  const url = new URL(window.location);
  if (q) {
    url.searchParams.set('q', q);
  }

  url.searchParams.delete('types');
  for (const type of types) {
    url.searchParams.append('types', type);
  }

  url.searchParams.delete('tags');
  for (const tag of tags) {
    url.searchParams.append('tags', tag);
  }


  window.history.pushState({search: url.searchParams.toString()}, '', url);
}

function setFormFromLocation() {
  const url = new URL(window.location);
  let searchParams = url.searchParams;
  setFormFromSearchParams(searchParams);
}

function setFormFromSearchParams(searchParams) {
  let q = searchParams.get('q');
  document.querySelector('form#search input#q').value = q;

  let types = searchParams.getAll('types');

  for (const type of allTypes) {
    document.querySelector(`form#search input[name="${type}"]`).checked = types.includes(type);
  }

  let tags = searchParams.getAll('tags');
  document.querySelectorAll('form#search input[name="tag"]').forEach(input => {
    input.checked = tags.includes(input.value);
  });
}

window.addEventListener('DOMContentLoaded', _ => {
  ensurePagefind()
    .then(_ => {
      setFormFromLocation();
      doSearch();
    })
    .catch(e => console.error('page find error', e));

  let form = document.querySelector('form#search');
  form.addEventListener('submit', e => {
    e.preventDefault();

    doSearch();
  });

  // Submit form on post type change
  let checkboxes = form.querySelectorAll('input[type="checkbox"]');
  checkboxes.forEach(checkbox => {
    checkbox.addEventListener('change', _ => {
      doSearch();
    });
  });

  // Using browser back or forward button
  window.addEventListener('popstate', event => {
    // Only intercept if on search page
    if (!['/search/', '/search'].includes(window.location.pathname)) return;

    ensurePagefind()
      .then(_ => {
        let searchParams = new URLSearchParams(event.state?.search ?? '');
        setFormFromSearchParams(searchParams);
        // Don't update history as we're navigating through history!
        doSearch(true);
      })
      .catch(e => console.error('page find error', e));
  });
});