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

  var boardId = KANBAN.boardId;
  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 += ' 220px'; });
    grid.style.gridTemplateColumns = cols;
  }

  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.innerHTML =
      '<div class="card-job-number">' + esc(card.job_number || '') + '</div>' +
      '<div class="card-job-name">' + esc(card.job_name || '') + '</div>';
    div.addEventListener('click', function () {
      window.KanbanModal.openEdit(
        card.id,
        card.column_id,
        card.swim_lane_id,
        card.job_number,
        card.job_name
      );
    });
    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));
      }
    });
  }

  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));
      }
    },
    onCardUpdated: function (id, jobNumber, jobName) {
      var card = KANBAN.cards.find(function (c) { return String(c.id) === String(id); });
      if (card) {
        card.job_number = jobNumber;
        card.job_name = jobName;
      }
      var el = document.querySelector('.kanban-card[data-id="' + id + '"]');
      if (el) {
        el.querySelector('.card-job-number').textContent = jobNumber;
        el.querySelector('.card-job-name').textContent = jobName;
      }
    },
    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();
    },
    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 = '<span class="lane-label">' + esc(lane.name) + '</span>';
      grid.appendChild(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);
      });

      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); });
    },
    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();
})();