let items = {};
const id = new URLSearchParams(window.location.search).get('id');

document.onreadystatechange = function() {
  if (document.readyState === 'interactive') {
    fetch('/api/items').then(r => r.json()).then((data) => {
      items = data;
      fillForm();
    });
  }
}

function fillForm() {
  const item = items[id];

  const is_in = document.getElementById('is_in');

  for (const [_, item] of Object.entries(items)) {
    const option = document.createElement('option');
    option.value = item.id;
    option.textContent = `${item.id} ${item.name && `(${item.name})` || ''}`
    is_in.appendChild(option);
  };

  document.getElementById('id').placeholder = '';

  if (id && item) {
    document.getElementById('id').value = item.id;
    document.getElementById('is_in').value = item.is_in;
    document.getElementById('coords_bl').value = item.coords_bl;
    document.getElementById('coords_tr').value = item.coords_tr;
    document.getElementById('type').value = item.type;
    document.getElementById('name').value = item.name;
    document.getElementById('content').value = item.content;
    document.getElementById('note').value = item.note;
    document.getElementById('hidden').checked = item.hidden;
  }

  const saveBtn = document.getElementById('save');
  const delBtn = document.getElementById('delete');

  saveBtn.onclick = function(e) {
    e.preventDefault();
    save();
  };

  delBtn.onclick = function(e) {
    e.preventDefault();
    del();
  }
}

function save() {
  item = {
    id: document.getElementById('id').value || null,
    is_in: document.getElementById('is_in').value || null,
    coords_bl: document.getElementById('coords_bl').value || null,
    coords_tr: document.getElementById('coords_tr').value || null,
    type: document.getElementById('type').value || null,
    name: document.getElementById('name').value || null,
    content: document.getElementById('content').value || null,
    note: document.getElementById('note').value || null,
    hidden: document.getElementById('hidden').checked,
  }

  if (items[item.id]) {
    if (!id || (id && id != item.id)) {
      alert(`ID ${item.id} exists. Please chose a different ID or edit the existing ${item.id} item!`);
      return;
    }
  }

  const original_id = id || item.id;

  fetch(`/api/items/${original_id}`, {
    method: 'PUT',
    headers: {'Content-Type': 'application/json'},
    body: JSON.stringify(item),
  })
  .then(r => {
    if (r.ok) {
      window.location.href = '../';
    } else {
      r.text().then(t => alert(`Error:\n${t}`));
    }
  }).catch(error => {
    alert(`Error:\n${error}`);
  });
}

function del() {
  if (id && confirm('Are you sure?')) {
    fetch(`/api/items/${id}`, {method: 'DELETE'}).then(r => {
      if (r.ok) {
        window.location.href = '../';
      } else {
        r.text().then(t => alert(`Error:\n${t}`));
      }
    }).catch(error => {
      alert(`Error:\n${error}`);
    });
  }
}