let items = {};

document.onreadystatechange = function() {
  if (document.readyState === 'interactive') {
    document.getElementById('search').oninput = search;
    const checkbox = document.getElementById('showhidden')
    checkbox.oninput = showhidden;
    fetch('/api/items').then((response) => response.json()).then((data) => {
      items = data;
      renderItems();
      showhidden({target: checkbox});
    });
  }
}

function renderItems() {
  const container = document.getElementById('results');
  const template = document.getElementById('item');
  const loading = document.getElementById('loading');
  let count = 0;

  for (const [id, item] of Object.entries(items)) {
    const clone = template.content.cloneNode(true);
    const [loc, longloc] = getLocString(items, item);
    clone.querySelector(".loc").textContent = loc;
    clone.querySelector(".loc").title = longloc;
    clone.querySelector(".type").textContent = item.type;
    clone.querySelector(".id").textContent = item.id;
    clone.querySelector(".name").textContent = item.name;
    clone.querySelector(".content").textContent = item.content;
    clone.querySelector(".note").textContent = item.note;
    clone.querySelector(".result").id = `item-${id}`;
    clone.querySelector("a").href = `form.html?id=${encodeURIComponent(id)}`;
    if (item.hidden) {
      clone.querySelector(".result").classList.add('hidden')
    } else {
      count++;
    }
    container.appendChild(clone);
  };
  loading.remove();
  updateCounter(count);
}

function getLocString(items, item) {
  item.ancestors = [];
  let next = item;
  let loop = false;
  while (next) {
    if (item.ancestors.includes(next)) {
      loop = true;
      if (item.ancestors.length == 1) {
        item.ancestors.push(null);
      }
      break;
    }
    item.ancestors.unshift(next);
    next = items[next.is_in];
  }
  item.ancestors.pop();
  let loc = item.ancestors.map(i => i.id).join(' ➜ ') || '⬚';
  let longloc = item.ancestors.map(i => `${i.type || ''} ${i.id} ${i.name && `(${i.name})` || ''}`).join(' ➜ ') || 'universe';
  if (loop) {
    loc += ' ↻';
    longloc += ' ↻';
  }
  return [loc, `${item.id} is in ${longloc}`];
}

function search(e) {
  const searchAttrs = ['id', 'name', 'type', 'note', 'content'];
  const query = e.target.value;
  const regex = new RegExp(query, 'i')
  let count = 0;

  for (const elem of document.getElementsByClassName('result')) {
    const item = items[elem.id.slice(5)];
    let found = false;
    if (query) {
      for (const a in searchAttrs) {
        const attr = item[searchAttrs[a]];
        if (attr && attr.match(regex)) {
          found = true;
          break;
        }
      }
    } else {
      found = true;
    }

    if (found) {
      elem.classList.remove('filtered');
      count++;
    } else {
      elem.classList.add('filtered');
    }
  }

  // Indicate failed search.
  if (count) {
    e.target.classList.remove('failed');
  } else {
    e.target.classList.add('failed');
  }

  updateCounter(count);
}

function updateCounter(count){
  const itemcount = document.getElementById('itemcount');

  switch(count) {
    case 0:
      itemcount.textContent = 'No items found.';
      break;
    case 1:
      itemcount.textContent = '1 item found.';
      break;
    default:
      itemcount.textContent = `${count} items found.`;
      break;
  }
}

function showhidden(e){
  const container = document.getElementById('results');
  if (e.target.checked) {
    results.classList.add('showhidden');
  } else {
    results.classList.remove('showhidden');
  }
}

function showItem(e) {
  const item = items[e.target.id.slice(5)];
  const ancestors = item.ancestors.concat(item);
  for (let i = ancestors.length-1; i >= 0; i--) {
    const ancestor = ancestors[i];
    if (ancestor.coords_bl && ancestor.coords_tr) {
      if (ancestor != item) {
        const mapnote = `Showing ${ancestor.type || ''} ${ancestor.id} ${ancestor.name && `(${ancestor.name})` || ''}`;
        document.getElementById('mapnote').textContent = mapnote;
      }
      coordsToMap(ancestor.coords_bl, ancestor.coords_tr);
      break;
    }
  }
}

function hideItem(e) {
  clearMap();
}