// assets/scripts/crud.js
// Generisches CRUD-Handler für Kunden, Projekte, Leistungen

const api = window.CRUD?.apiBase ?? '';

// ── Hilfsfunktionen ───────────────────────────────────────────────────────────

function buildClientOptions(selectedId = null) {
  const clients = window.CRUD?.clients ?? [];
  let html = '<option value="">Bitte wählen</option>';
  clients.forEach(c => {
    const sel = String(c.id) === String(selectedId) ? ' selected' : '';
    html += `<option value="${c.id}"${sel}>${c.name}</option>`;
  });
  return html;
}

function rowPrefix() {
  // Ermittelt den Entitätstyp aus der URL
  if (location.pathname.includes('/clients'))  return 'client';
  if (location.pathname.includes('/projects')) return 'project';
  if (location.pathname.includes('/services')) return 'service';
  return 'row';
}

// ── Create-Formular ───────────────────────────────────────────────────────────

function initCreateForm() {
  const btnNew    = document.getElementById('btn-new');
  const form      = document.getElementById('crud-create');
  const btnSave   = document.getElementById('btn-create-save');
  const btnCancel = document.getElementById('btn-create-cancel');

  if (!btnNew || !form) return;

  btnNew.addEventListener('click', () => {
    form.classList.toggle('crud-create--visible');
    document.getElementById('create-name')?.focus();
  });

  btnCancel?.addEventListener('click', () => {
    form.classList.remove('crud-create--visible');
    resetCreateForm();
  });

  btnSave?.addEventListener('click', () => createEntity());
}

function resetCreateForm() {
  const fields = ['create-name', 'create-note'];
  fields.forEach(id => {
    const el = document.getElementById(id);
    if (el) el.value = '';
  });
  const rate = document.getElementById('create-rate');
  if (rate) rate.value = '';
  const billable = document.getElementById('create-billable');
  if (billable) billable.checked = true;
  const client = document.getElementById('create-client');
  if (client) client.value = '';
}

async function createEntity() {
  const name = document.getElementById('create-name')?.value?.trim();
  if (!name) { alert('Bitte einen Namen eingeben.'); return; }

  const body = buildCreateBody();

  try {
    const res = await fetch(api, {
      method:  'POST',
      headers: { 'Content-Type': 'application/json' },
      body:    JSON.stringify(body),
    });

    if (!res.ok) {
      const err = await res.json().catch(() => ({}));
      alert(err.error ?? 'Fehler beim Speichern.');
      return;
    }

    const data = await res.json();
    appendRowToList(data);
    document.getElementById('crud-create')?.classList.remove('crud-create--visible');
    resetCreateForm();

  } catch (err) {
    console.error(err);
    alert('Fehler beim Speichern.');
  }
}

function buildCreateBody() {
  const body = {
    name: document.getElementById('create-name')?.value?.trim(),
    note: document.getElementById('create-note')?.value || null,
  };

  // Kunden-spezifisch
  const rate = document.getElementById('create-rate');
  if (rate) body.hourlyRate = rate.value || null;

  // Projekt-spezifisch
  const client = document.getElementById('create-client');
  if (client) body.clientId = parseInt(client.value) || null;

  // Leistungs-spezifisch
  const billable = document.getElementById('create-billable');
  if (billable) body.billable = billable.checked;

  return body;
}

// ── Liste: Event Delegation ────────────────────────────────────────────────────

function initList() {
  const list = document.getElementById('crud-list');
  if (!list) return;

  list.addEventListener('click', e => {
    const actionEl = e.target.closest('[data-action]');
    if (!actionEl) return;

    const action = actionEl.dataset.action;
    const row    = e.target.closest('.crud-row');
    if (!row) return;

    switch (action) {
      case 'edit':   openEdit(row);   break;
      case 'delete': deleteRow(row);  break;
      case 'save':   saveEdit(row);   break;
      case 'cancel': closeEdit(row);  break;
      case 'unarchive': unarchiveRow(row); break;
    }
  });
}

// ── Inline Edit ───────────────────────────────────────────────────────────────

function openEdit(row) {
  row.querySelector('.crud-row__display').hidden = true;
  row.querySelector('.crud-row__edit').hidden    = false;
  row.querySelector('.edit-name')?.focus();
}

function closeEdit(row) {
  row.querySelector('.crud-row__display').hidden = false;
  row.querySelector('.crud-row__edit').hidden    = true;
}

async function saveEdit(row) {
  const id   = row.dataset.id;
  const name = row.querySelector('.edit-name')?.value?.trim();

  if (!name) { alert('Bitte einen Namen eingeben.'); return; }

  const body = buildEditBody(row);

  try {
    const res = await fetch(`${api}/${id}`, {
      method:  'PATCH',
      headers: { 'Content-Type': 'application/json' },
      body:    JSON.stringify(body),
    });

    if (!res.ok) { alert('Fehler beim Speichern.'); return; }

    const data = await res.json();
    updateRowDisplay(row, data);
    closeEdit(row);

  } catch (err) {
    console.error(err);
    alert('Fehler beim Speichern.');
  }
}

function buildEditBody(row) {
  const body = {
    name: row.querySelector('.edit-name')?.value?.trim(),
    note: row.querySelector('.edit-note')?.value || null,
  };

  // Kunden
  const rate = row.querySelector('.edit-rate');
  if (rate) body.hourlyRate = rate.value || null;

  // Projekt
  const client = row.querySelector('.edit-client');
  if (client) body.clientId = parseInt(client.value) || null;

  // Leistung
  const billable = row.querySelector('.edit-billable');
  if (billable) body.billable = billable.checked;

  return body;
}

function updateRowDisplay(row, data) {
  const nameEl = row.querySelector('.crud-row__name');
  const metaEl = row.querySelector('.crud-row__meta');

  if (nameEl) nameEl.textContent = data.name;

  // Kunden: Meta-Text unverändert (Projektanzahl ändert sich nicht)
  // Projekte: Client-Name aktualisieren
  if (data.clientName && metaEl) metaEl.textContent = data.clientName;

  // data-Attribute aktualisieren
  row.dataset.name = data.name;
  if (data.hourlyRate !== undefined) row.dataset.rate = data.hourlyRate ?? '';
  if (data.clientId   !== undefined) row.dataset.clientId = data.clientId;
  if (data.billable   !== undefined) row.dataset.billable = data.billable ? '1' : '0';
  if (data.note       !== undefined) row.dataset.note = data.note ?? '';

  // Edit-Felder aktualisieren
  const editName = row.querySelector('.edit-name');
  if (editName) editName.value = data.name;

  const editNote = row.querySelector('.edit-note');
  if (editNote) editNote.value = data.note ?? '';

  const editRate = row.querySelector('.edit-rate');
  if (editRate) editRate.value = data.hourlyRate ?? '';

  const editBillable = row.querySelector('.edit-billable');
  if (editBillable) editBillable.checked = !!data.billable;
}

// ── Delete ────────────────────────────────────────────────────────────────────

async function deleteRow(row) {
  if (!confirm('Wirklich löschen?')) return;

  try {
    const res = await fetch(`${api}/${row.dataset.id}`, { method: 'DELETE' });

    if (res.status === 409) {
      if (confirm('Dieser Eintrag hat abhängige Zeiteinträge und kann nicht gelöscht werden.\nStattdessen archivieren?')) {
        await archiveRow(row);
      }
      return;
    }

    if (!res.ok) { alert('Fehler beim Löschen.'); return; }

    row.classList.add('crud-row--removing');
    setTimeout(() => row.remove(), 280);

  } catch {
    alert('Fehler beim Löschen.');
  }
}

async function archiveRow(row) {
  try {
    const res = await fetch(`${api}/${row.dataset.id}/archive`, { method: 'PATCH' });
    if (!res.ok) { alert('Fehler beim Archivieren.'); return; }

    row.dataset.archived = '1';
    row.classList.add('crud-row--archived');
    updateRowArchivedState(row, true);
    filterByTab(document.querySelector('.crud-tab--active')?.dataset.tab ?? 'active');

  } catch {
    alert('Fehler beim Archivieren.');
  }
}

async function unarchiveRow(row) {
  try {
    const res = await fetch(`${api}/${row.dataset.id}/unarchive`, { method: 'PATCH' });
    if (!res.ok) { alert('Fehler beim Wiederherstellen.'); return; }

    row.dataset.archived = '0';
    row.classList.remove('crud-row--archived');
    updateRowArchivedState(row, false);
    filterByTab(document.querySelector('.crud-tab--active')?.dataset.tab ?? 'active');

  } catch {
    alert('Fehler beim Wiederherstellen.');
  }
}

function updateRowArchivedState(row, archived) {
  const actions = row.querySelector('.crud-row__actions');
  if (!actions) return;

  if (archived) {
    actions.innerHTML = `
      <button class="crud-row__btn crud-row__btn--restore" data-action="unarchive" title="Wiederherstellen">
        <svg viewBox="0 0 16 16" fill="none"><path d="M2 8a6 6 0 1 1 1.5 3.5" stroke="currentColor" stroke-width="1.3" stroke-linecap="round"/><path d="M2 13V9h4" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/></svg>
      </button>`;
    row.querySelector('.crud-row__edit')?.remove();
  } else {
    actions.innerHTML = `
      <button class="crud-row__btn crud-row__btn--edit" data-action="edit" title="Bearbeiten">
        <svg viewBox="0 0 16 16" fill="none"><path d="M11 2l3 3L5 14H2v-3L11 2z" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/></svg>
      </button>
      <button class="crud-row__btn crud-row__btn--delete" data-action="delete" title="Löschen">
        <svg viewBox="0 0 16 16" fill="none"><path d="M3 4h10M6 4V2h4v2M5 4l.5 9h5l.5-9" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/></svg>
      </button>`;
  }
}

function filterByTab(tab) {
  document.querySelectorAll('#crud-list .crud-row').forEach(row => {
    row.hidden = tab === 'active'
        ? row.dataset.archived === '1'
        : row.dataset.archived === '0';
  });
}

function initTabs() {
  const tabs = document.querySelectorAll('.crud-tab');
  if (!tabs.length) return;

  filterByTab('active');

  tabs.forEach(tab => {
    tab.addEventListener('click', () => {
      tabs.forEach(t => t.classList.remove('crud-tab--active'));
      tab.classList.add('crud-tab--active');
      filterByTab(tab.dataset.tab);

      const btnNew = document.getElementById('btn-new');
      if (btnNew) btnNew.hidden = tab.dataset.tab === 'archived';
    });
  });
}

// ── Neue Zeile einfügen ───────────────────────────────────────────────────────

function appendRowToList(data) {
  const list = document.getElementById('crud-list');
  if (!list) return;

  const html = buildRowHTML(data);

  // Services haben Gruppen → in die richtige Gruppe einfügen
  if (data.billable !== undefined) {
    const groupLabel = data.billable ? 'Verrechenbar' : 'Nicht-verrechenbar';
    let targetGroup = null;

    list.querySelectorAll('.crud-list__group').forEach(g => {
      if (g.querySelector('.crud-list__group-label')?.textContent === groupLabel) {
        targetGroup = g;
      }
    });

    if (targetGroup) {
      targetGroup.insertAdjacentHTML('beforeend', html);
    } else {
      // Gruppe existiert noch nicht → neu anlegen
      const groupHtml = `<div class="crud-list__group"><div class="crud-list__group-label">${groupLabel}</div>${html}</div>`;
      if (!data.billable) {
        // Nicht-verrechenbar immer ans Ende
        list.insertAdjacentHTML('beforeend', groupHtml);
      } else {
        // Verrechenbar vor die erste existierende Gruppe
        const firstGroup = list.querySelector('.crud-list__group');
        firstGroup
            ? firstGroup.insertAdjacentHTML('beforebegin', groupHtml)
            : list.insertAdjacentHTML('beforeend', groupHtml);
      }
    }
  } else {
    list.insertAdjacentHTML('beforeend', html);
  }

  const prefix = rowPrefix();
  const el = document.getElementById(`${prefix}-${data.id}`);
  if (el) {
    requestAnimationFrame(() => requestAnimationFrame(() => {
      el.classList.remove('crud-row--new');
    }));
  }
}

function buildRowHTML(data) {
  const prefix = rowPrefix();
  let metaHtml = '';
  let editFields = '';

  // Kunden
  if (data.projectCount !== undefined) {
    const c = data.projectCount;
    metaHtml = `<span class="crud-row__meta">${c} ${c === 1 ? 'Projekt' : 'Projekte'}</span>`;
    editFields = `
      <label class="entry-form__label">Name</label>
      <div class="entry-form__field"><input type="text" class="input edit-name" value="${data.name}" /></div>
      <label class="entry-form__label">Stundensatz</label>
      <div class="entry-form__field" style="gap:8px">
        <input type="number" class="input edit-rate" style="width:100px" value="${data.hourlyRate ?? ''}" step="0.01" min="0" />
        <span style="color:#7a8a9a;font-size:0.875rem">€</span>
      </div>
      <label class="entry-form__label">Bemerkung</label>
      <div class="entry-form__field"><textarea class="textarea edit-note" rows="2">${data.note ?? ''}</textarea></div>`;
  }

  // Projekte
  if (data.clientName !== undefined && data.projectCount === undefined) {
    metaHtml = `<span class="crud-row__meta">${data.clientName}</span>`;
    editFields = `
      <label class="entry-form__label">Name</label>
      <div class="entry-form__field"><input type="text" class="input edit-name" value="${data.name}" /></div>
      <label class="entry-form__label">Kunde</label>
      <div class="entry-form__field"><select class="select edit-client">${buildClientOptions(data.clientId)}</select></div>
      <label class="entry-form__label">Bemerkung</label>
      <div class="entry-form__field"><textarea class="textarea edit-note" rows="2">${data.note ?? ''}</textarea></div>`;
  }

  // Leistungen
  if (data.billable !== undefined) {
    editFields = `
      <label class="entry-form__label">Name</label>
      <div class="entry-form__field"><input type="text" class="input edit-name" value="${data.name}" /></div>
      <label class="entry-form__label">Verrechenbar</label>
      <div class="entry-form__field">
        <label style="display:flex;align-items:center;gap:8px;cursor:pointer">
          <input type="checkbox" class="edit-billable" ${data.billable ? 'checked' : ''} />
          <span style="font-size:0.875rem">Ja, diese Leistung ist verrechenbar</span>
        </label>
      </div>
      <label class="entry-form__label">Bemerkung</label>
      <div class="entry-form__field"><textarea class="textarea edit-note" rows="2">${data.note ?? ''}</textarea></div>`;
  }

  return `
    <div class="crud-row crud-row--new"
         id="${prefix}-${data.id}"
         data-id="${data.id}"
         data-archived="0"
         data-name="${data.name}"
         ${data.hourlyRate !== undefined ? `data-rate="${data.hourlyRate ?? ''}"` : ''}
         ${data.clientId   !== undefined ? `data-client-id="${data.clientId}"` : ''}
         ${data.billable   !== undefined ? `data-billable="${data.billable ? '1' : '0'}"` : ''}
         data-note="${data.note ?? ''}">

      <div class="crud-row__display">
        <div class="crud-row__info">
          <span class="crud-row__name">${data.name}</span>
          ${metaHtml}
        </div>
        <div class="crud-row__actions">
          <button class="crud-row__btn crud-row__btn--edit" data-action="edit" title="Bearbeiten">
            <svg viewBox="0 0 16 16" fill="none"><path d="M11 2l3 3L5 14H2v-3L11 2z" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/></svg>
          </button>
          <button class="crud-row__btn crud-row__btn--delete" data-action="delete" title="Löschen">
            <svg viewBox="0 0 16 16" fill="none"><path d="M3 4h10M6 4V2h4v2M5 4l.5 9h5l.5-9" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/></svg>
          </button>
        </div>
      </div>

      <div class="crud-row__edit" hidden>
        <div class="entry-form__grid entry-form__grid--inline">
          ${editFields}
          <div class="entry-form__actions">
            <button type="button" class="btn btn-primary" data-action="save">Sichern</button>
            <button type="button" class="btn btn-secondary" data-action="cancel">Abbrechen</button>
          </div>
        </div>
      </div>
    </div>`;
}

// ── Init ──────────────────────────────────────────────────────────────────────

document.addEventListener('DOMContentLoaded', () => {
  initCreateForm();
  initList();
  initTabs();
});