/* kanban-board.js - grid rendering and drag-drop between cells */
(function () {
  'use strict';

  var boardId = KANBAN.boardId;
  var laneCollapseStorageKey = 'kanban_lane_collapsed_' + String(boardId);
  var collapsedLaneIds = loadCollapsedLaneIds();
  var searchState = {
    query: ''
  };
  var dragState = {
    active: false,
    x: 0,
    y: 0,
    rafId: 0
  };

  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) { console.error(url, e); });
  }

  function esc(s) {
    return String(s)
      .replace(/&/g, '&')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;');
  }

  function applyGridTemplate() {
    var grid = document.getElementById('kanban-grid');
    var colHs = grid.querySelectorAll('.kanban-col-header');
    var cols = '240px';
    colHs.forEach(function () { cols += ' 230px'; });
    grid.style.gridTemplateColumns = cols;
  }

  function loadCollapsedLaneIds() {
    var laneMap = {};
    try {
      var raw = window.localStorage.getItem(laneCollapseStorageKey);
      if (!raw) return laneMap;
      var arr = JSON.parse(raw);
      if (!Array.isArray(arr)) return laneMap;
      arr.forEach(function (laneId) {
        laneMap[String(laneId)] = true;
      });
    } catch (e) {
      console.warn('Failed to load lane collapse state', e);
    }
    return laneMap;
  }

  function saveCollapsedLaneIds() {
    try {
      window.localStorage.setItem(laneCollapseStorageKey, JSON.stringify(Object.keys(collapsedLaneIds)));
    } catch (e) {
      console.warn('Failed to save lane collapse state', e);
    }
  }

  function setLaneCollapsed(laneId, isCollapsed) {
    var laneKey = String(laneId);
    var header = document.querySelector('.kanban-lane-header[data-lane-id="' + laneKey + '"]');
    if (!header) return;

    var laneCells = document.querySelectorAll('.kanban-cell[data-lane-id="' + laneKey + '"]');
    header.classList.toggle('lane-collapsed', isCollapsed);
    laneCells.forEach(function (cell) {
      cell.classList.toggle('lane-collapsed', isCollapsed);
    });

    var toggleBtn = header.querySelector('.lane-toggle');
    if (toggleBtn) {
      toggleBtn.setAttribute('aria-expanded', isCollapsed ? 'false' : 'true');
      toggleBtn.title = isCollapsed ? 'Expand swim lane' : 'Collapse swim lane';
      toggleBtn.setAttribute('aria-label', toggleBtn.title);
    }

    if (isCollapsed) {
      collapsedLaneIds[laneKey] = true;
    } else {
      delete collapsedLaneIds[laneKey];
    }
    saveCollapsedLaneIds();
  }

  function toggleLaneCollapsed(laneId) {
    var laneKey = String(laneId);
    setLaneCollapsed(laneKey, !collapsedLaneIds[laneKey]);
  }

  function bindLaneHeaderToggle(headerEl) {
    if (!headerEl) return;
    var toggleBtn = headerEl.querySelector('.lane-toggle');
    if (!toggleBtn) return;

    if (!toggleBtn.dataset.boundToggle) {
      toggleBtn.addEventListener('click', function (evt) {
        evt.preventDefault();
        evt.stopPropagation();
        toggleLaneCollapsed(headerEl.dataset.laneId);
      });
      toggleBtn.dataset.boundToggle = '1';
    }
  }

  function initLaneHeaderToggles() {
    document.querySelectorAll('.kanban-lane-header').forEach(function (headerEl) {
      bindLaneHeaderToggle(headerEl);
      if (collapsedLaneIds[String(headerEl.dataset.laneId)]) {
        setLaneCollapsed(headerEl.dataset.laneId, true);
      }
    });
  }

  function cardBodyHtml(card) {
    var html = '<div class="card-headline">' +
      '<span class="card-job-number">' + esc(card.job_number || '') + '</span>';

    if (card.customer_name) {
      html += '<span class="card-customer">' + esc(card.customer_name) + '</span>';
    }

    html += '</div>';

    return html;
  }

  function buildCardSearchText(card) {
    return [
      card.job_number || '',
      card.job_name || '',
      card.customer_name || '',
      card.notes || ''
    ].join(' ').toLowerCase();
  }

  function buildCardEl(card) {
    var div = document.createElement('div');
    div.className = 'kanban-card';
    div.dataset.id = card.id;
    div.dataset.columnId = card.column_id;
    div.dataset.laneId = card.swim_lane_id;
    div.dataset.searchText = buildCardSearchText(card);
    div.innerHTML = cardBodyHtml(card);
    div.addEventListener('click', function () {
      var c = KANBAN.cards.find(function (x) { return String(x.id) === String(div.dataset.id); });
      if (!c) return;
      window.KanbanModal.openEdit(c.id, c.column_id, c.swim_lane_id, c.job_number, c.job_name, c.customer_name, c.delivery_date, c.quantity, c.notes, c.full_note);
    });
    return div;
  }

  function renderCards() {
    KANBAN.cards.forEach(function (card) {
      var cell = document.querySelector(
        '.kanban-cell[data-col-id="' + card.column_id + '"][data-lane-id="' + card.swim_lane_id + '"]'
      );
      if (cell) {
        cell.appendChild(buildCardEl(card));
      }
    });
    applyCardFilter();
  }

  function applyCardFilter() {
    var activeQuery = searchState.query;
    document.querySelectorAll('.kanban-card').forEach(function (el) {
      var searchableText = (el.dataset.searchText || '').toLowerCase();
      var isMatch = activeQuery === '' || searchableText.indexOf(activeQuery) > -1;
      el.classList.toggle('kanban-card-hidden', !isMatch);
    });
  }

  function initJobSearch() {
    var searchInput = document.getElementById('job-search-input');
    if (!searchInput) return;

    searchInput.addEventListener('input', function () {
      searchState.query = String(searchInput.value || '').toLowerCase().trim();
      applyCardFilter();
    });
  }

  function handleDragEnd(evt) {
    var cardId = evt.item.dataset.id;
    var newColId = evt.to.dataset.colId;
    var newLaneId = evt.to.dataset.laneId;
    var newPos = evt.newIndex;

    var siblings = [];
    evt.to.querySelectorAll('.kanban-card').forEach(function (el) {
      siblings.push(el.dataset.id);
    });

    var card = KANBAN.cards.find(function (c) { return String(c.id) === String(cardId); });
    if (card) {
      card.column_id = parseInt(newColId, 10);
      card.swim_lane_id = parseInt(newLaneId, 10);
      card.position = newPos;
    }

    evt.item.dataset.columnId = newColId;
    evt.item.dataset.laneId = newLaneId;

    post('/cards/' + cardId + '/move', {
      column_id: newColId,
      swim_lane_id: newLaneId,
      position: newPos,
      sibling_ids: siblings.join(',')
    }, function (res) {
      if (!res.ok) console.error('Move failed', res);
    });
  }

  function createCellSortable(cell) {
    Sortable.create(cell, {
      group: 'cards',
      animation: 150,
      ghostClass: 'sortable-ghost',
      chosenClass: 'sortable-chosen',
      handle: '.kanban-card',
      delayOnTouchOnly: true,
      delay: 120,
      touchStartThreshold: 3,
      fallbackTolerance: 4,
      scroll: true,
      bubbleScroll: true,
      scrollSensitivity: 140,
      scrollSpeed: 32,
      onStart: function () { startEdgeAutoScroll(); },
      onEnd: function (evt) {
        stopEdgeAutoScroll();
        handleDragEnd(evt);
      }
    });
  }

  function updatePointerFromEvent(evt) {
    if (!evt) return;
    if (evt.touches && evt.touches.length > 0) {
      dragState.x = evt.touches[0].clientX;
      dragState.y = evt.touches[0].clientY;
      return;
    }
    if (evt.clientX !== undefined && evt.clientY !== undefined) {
      dragState.x = evt.clientX;
      dragState.y = evt.clientY;
    }
  }

  function edgeScrollStep() {
    if (!dragState.active) return;

    var wrapper = document.querySelector('.kanban-wrapper');
    if (wrapper) {
      var rect = wrapper.getBoundingClientRect();
      var edge = 110;
      var maxStep = 40;
      var dx = 0;
      var dy = 0;

      if (dragState.x > 0 && dragState.x < rect.left + edge) {
        dx = -Math.min(maxStep, Math.ceil((rect.left + edge - dragState.x) / 3));
      } else if (dragState.x > rect.right - edge && dragState.x < rect.right + edge) {
        dx = Math.min(maxStep, Math.ceil((dragState.x - (rect.right - edge)) / 3));
      }

      if (dragState.y > 0 && dragState.y < rect.top + edge) {
        dy = -Math.min(maxStep, Math.ceil((rect.top + edge - dragState.y) / 3));
      } else if (dragState.y > rect.bottom - edge && dragState.y < rect.bottom + edge) {
        dy = Math.min(maxStep, Math.ceil((dragState.y - (rect.bottom - edge)) / 3));
      }

      if (dx !== 0) wrapper.scrollLeft += dx;
      if (dy !== 0) wrapper.scrollTop += dy;
    }

    dragState.rafId = window.requestAnimationFrame(edgeScrollStep);
  }

  function startEdgeAutoScroll() {
    if (dragState.active) return;
    dragState.active = true;
    document.addEventListener('pointermove', updatePointerFromEvent, { passive: true });
    document.addEventListener('touchmove', updatePointerFromEvent, { passive: true });
    document.addEventListener('dragover', updatePointerFromEvent, { passive: true });
    dragState.rafId = window.requestAnimationFrame(edgeScrollStep);
  }

  function stopEdgeAutoScroll() {
    if (!dragState.active) return;
    dragState.active = false;
    if (dragState.rafId) {
      window.cancelAnimationFrame(dragState.rafId);
      dragState.rafId = 0;
    }
    document.removeEventListener('pointermove', updatePointerFromEvent);
    document.removeEventListener('touchmove', updatePointerFromEvent);
    document.removeEventListener('dragover', updatePointerFromEvent);
  }

  function initSortables() {
    document.querySelectorAll('.kanban-cell').forEach(createCellSortable);
  }

  document.getElementById('btn-add-card').addEventListener('click', function () {
    window.KanbanModal.openCreate(boardId, null, null);
  });

  window.KanbanBoard = {
    onCardCreated: function (card) {
      KANBAN.cards.push(card);
      var cell = document.querySelector(
        '.kanban-cell[data-col-id="' + card.column_id + '"][data-lane-id="' + card.swim_lane_id + '"]'
      );
      if (cell) {
        cell.appendChild(buildCardEl(card));
      }
      applyCardFilter();
    },
    onCardUpdated: function (id, data) {
      var card = KANBAN.cards.find(function (c) { return String(c.id) === String(id); });
      if (card) {
        card.job_number    = data.job_number    || '';
        card.job_name      = data.job_name      || '';
        card.customer_name = data.customer_name || '';
        card.delivery_date = data.delivery_date || null;
        card.quantity      = data.quantity      || '';
        card.notes         = data.notes         || '';
        card.full_note     = data.full_note !== undefined ? data.full_note : (card.full_note || '');
      }
      var el = document.querySelector('.kanban-card[data-id="' + id + '"]');
      if (el && card) {
        el.innerHTML = cardBodyHtml(card);
        el.dataset.searchText = buildCardSearchText(card);
      }
      applyCardFilter();
    },
    onCardDeleted: function (id) {
      KANBAN.cards = KANBAN.cards.filter(function (c) { return String(c.id) !== String(id); });
      var el = document.querySelector('.kanban-card[data-id="' + id + '"]');
      if (el) el.remove();
      applyCardFilter();
    },
    addColumn: function (col) {
      var grid = document.getElementById('kanban-grid');

      var headers = grid.querySelectorAll('.kanban-col-header');
      var refNode = headers.length ? headers[headers.length - 1].nextSibling : null;

      var hdr = document.createElement('div');
      hdr.className = 'kanban-col-header';
      hdr.dataset.colId = col.id;
      hdr.innerHTML = '<span class="col-label">' + esc(col.name) + '</span>';
      grid.insertBefore(hdr, refNode);

      var laneHeaders = grid.querySelectorAll('.kanban-lane-header');
      laneHeaders.forEach(function (lh) {
        var laneId = lh.dataset.laneId;
        var cell = document.createElement('div');
        cell.className = 'kanban-cell';
        cell.dataset.colId = col.id;
        cell.dataset.laneId = laneId;
        var row = lh.parentNode;
        row.appendChild(cell);
        createCellSortable(cell);
      });

      applyGridTemplate();
    },
    removeColumn: function (colId) {
      document.querySelector('.kanban-col-header[data-col-id="' + colId + '"]').remove();
      document.querySelectorAll('.kanban-cell[data-col-id="' + colId + '"]').forEach(function (el) { el.remove(); });
      KANBAN.cards = KANBAN.cards.filter(function (c) { return String(c.column_id) !== String(colId); });
      applyGridTemplate();
    },
    addLane: function (lane) {
      var grid = document.getElementById('kanban-grid');
      var colHeaders = grid.querySelectorAll('.kanban-col-header');

      var lh = document.createElement('div');
      lh.className = 'kanban-lane-header';
      lh.dataset.laneId = lane.id;
      lh.innerHTML =
        '<button type="button" class="lane-toggle" title="Collapse swim lane" aria-label="Collapse swim lane" aria-expanded="true">' +
          '<i class="bi bi-chevron-down" aria-hidden="true"></i>' +
        '</button>' +
        '<span class="lane-label">' + esc(lane.name) + '</span>';
      grid.appendChild(lh);
      bindLaneHeaderToggle(lh);

      colHeaders.forEach(function (ch) {
        var cell = document.createElement('div');
        cell.className = 'kanban-cell';
        cell.dataset.colId = ch.dataset.colId;
        cell.dataset.laneId = lane.id;
        grid.appendChild(cell);
        createCellSortable(cell);
      });

      if (collapsedLaneIds[String(lane.id)]) {
        setLaneCollapsed(lane.id, true);
      }

      applyGridTemplate();
    },
    removeLane: function (laneId) {
      document.querySelector('.kanban-lane-header[data-lane-id="' + laneId + '"]').remove();
      document.querySelectorAll('.kanban-cell[data-lane-id="' + laneId + '"]').forEach(function (el) { el.remove(); });
      KANBAN.cards = KANBAN.cards.filter(function (c) { return String(c.swim_lane_id) !== String(laneId); });
      if (collapsedLaneIds[String(laneId)]) {
        delete collapsedLaneIds[String(laneId)];
        saveCollapsedLaneIds();
      }
    },
    renameColumn: function (colId, name) {
      var hdr = document.querySelector('.kanban-col-header[data-col-id="' + colId + '"] .col-label');
      if (hdr) hdr.textContent = name;
    },
    renameLane: function (laneId, name) {
      var hdr = document.querySelector('.kanban-lane-header[data-lane-id="' + laneId + '"] .lane-label');
      if (hdr) hdr.textContent = name;
    }
  };

  applyGridTemplate();
  renderCards();
  initSortables();
  initJobSearch();
  initLaneHeaderToggles();
})();