/* kanban-modal.js — card create/edit modal */
(function () {
  'use strict';

  var modal      = document.getElementById('cardModal');
  var bsModal    = new bootstrap.Modal(modal);
  var titleEl    = document.getElementById('cardModalLabel');
  var cardIdEl   = document.getElementById('card-id');
  var colIdEl    = document.getElementById('card-column-id');
  var laneIdEl   = document.getElementById('card-lane-id');
  var jobNumEl   = document.getElementById('card-job-number');
  var jobNameEl  = document.getElementById('card-job-name');
  var errEl      = document.getElementById('card-modal-error');
  var btnSave    = document.getElementById('btn-save-card');
  var btnDelete  = document.getElementById('btn-delete-card');

  var boardId    = KANBAN.boardId;

  /* ── Helpers ─────────────────────────────────────────────── */
  function post(url, data, cb) {
    var params = new URLSearchParams();
    Object.keys(data).forEach(function (k) { params.append(k, data[k]); });
    fetch(url, { method: 'POST', headers: { 'Content-Type': 'application/x-www-form-urlencoded' }, body: params.toString() })
      .then(function (r) { return r.json(); })
      .then(cb)
      .catch(function (e) { showError('Network error: ' + e); });
  }

  function showError(msg) {
    errEl.textContent = msg;
    errEl.classList.remove('d-none');
  }

  function clearError() {
    errEl.textContent = '';
    errEl.classList.add('d-none');
  }

  /* ── Open for create ──────────────────────────────────────── */
  function openCreate(bId, colId, laneId) {
    titleEl.textContent  = 'Add Card';
    cardIdEl.value       = '';
    colIdEl.value        = colId  || '';
    laneIdEl.value       = laneId || '';
    jobNumEl.value       = '';
    jobNameEl.value      = '';
    btnDelete.classList.add('d-none');
    clearError();
    bsModal.show();
    jobNumEl.focus();
  }

  /* ── Open for edit ───────────────────────────────────────── */
  function openEdit(id, colId, laneId, jobNum, jobName) {
    titleEl.textContent  = 'Edit Card';
    cardIdEl.value       = id;
    colIdEl.value        = colId;
    laneIdEl.value       = laneId;
    jobNumEl.value       = jobNum  || '';
    jobNameEl.value      = jobName || '';
    btnDelete.classList.remove('d-none');
    clearError();
    bsModal.show();
    jobNumEl.focus();
  }

  /* ── Save ─────────────────────────────────────────────────── */
  btnSave.addEventListener('click', function () {
    clearError();
    var id     = cardIdEl.value;
    var colId  = colIdEl.value;
    var laneId = laneIdEl.value;
    var jNum   = jobNumEl.value.trim();
    var jName  = jobNameEl.value.trim();

    if (!jNum && !jName) {
      showError('Enter at least a job number or job name.');
      return;
    }

    if (id) {
      // Update existing
      post('/cards/' + id, { job_number: jNum, job_name: jName }, function (res) {
        if (res.ok) {
          bsModal.hide();
          window.KanbanBoard.onCardUpdated(id, res.job_number, res.job_name);
        } else {
          showError(res.error || 'Save failed.');
        }
      });
    } else {
      // Create new — if no col/lane selected show column/lane picker
      if (!colId || !laneId) {
        showError('Please choose a column and swim lane first.');
        return;
      }
      post('/cards', {
        board_id:    boardId,
        column_id:   colId,
        swim_lane_id: laneId,
        job_number:  jNum,
        job_name:    jName
      }, function (res) {
        if (res.ok) {
          bsModal.hide();
          window.KanbanBoard.onCardCreated(res);
        } else {
          showError(res.error || 'Save failed.');
        }
      });
    }
  });

  /* ── Delete ──────────────────────────────────────────────── */
  btnDelete.addEventListener('click', function () {
    if (!confirm('Delete this card?')) return;
    var id = cardIdEl.value;
    post('/cards/' + id + '/delete', {}, function (res) {
      if (res.ok) {
        bsModal.hide();
        window.KanbanBoard.onCardDeleted(id);
      } else {
        showError(res.error || 'Delete failed.');
      }
    });
  });

  /* ── Column/Lane picker when Add Card clicked with no cell ── */
  // Populated lazily from board data
  modal.addEventListener('shown.bs.modal', function () {
    if (!cardIdEl.value && (!colIdEl.value || !laneIdEl.value)) {
      injectPicker();
    }
  });

  function injectPicker() {
    if (document.getElementById('card-picker')) return;

    var picker = document.createElement('div');
    picker.id = 'card-picker';
    picker.className = 'row g-2 mb-3';

    var colSel  = '<select class="form-select form-select-sm" id="pick-col"><option value="">-- Column --</option>';
    var laneSel = '<select class="form-select form-select-sm" id="pick-lane"><option value="">-- Swim Lane --</option>';

    document.querySelectorAll('.kanban-col-header').forEach(function (el) {
      colSel += '<option value="' + el.dataset.colId + '">' + el.querySelector('.col-label').textContent + '</option>';
    });
    document.querySelectorAll('.kanban-lane-header').forEach(function (el) {
      laneSel += '<option value="' + el.dataset.laneId + '">' + el.querySelector('.lane-label').textContent + '</option>';
    });

    colSel  += '</select>';
    laneSel += '</select>';

    picker.innerHTML =
      '<div class="col"><label class="form-label small">Column</label>' + colSel + '</div>' +
      '<div class="col"><label class="form-label small">Swim Lane</label>' + laneSel + '</div>';

    var first = document.getElementById('card-job-number').closest('.mb-3');
    modal.querySelector('.modal-body').insertBefore(picker, first);

    document.getElementById('pick-col').addEventListener('change', function () {
      colIdEl.value = this.value;
    });
    document.getElementById('pick-lane').addEventListener('change', function () {
      laneIdEl.value = this.value;
    });
  }

  /* ── Public API ──────────────────────────────────────────── */
  window.KanbanModal = { openCreate: openCreate, openEdit: openEdit };

})();