define(["jquery", "../slick.core"], function ($, Slick) {

  function CellCopyManager() {
    var _grid;
    var _self = this;
    var _copiedRanges;

    function init(grid) {
      _grid = grid;
      _grid.onKeyDown.subscribe(handleKeyDown);
    }

    function destroy() {
      _grid.onKeyDown.unsubscribe(handleKeyDown);
    }

    function handleKeyDown(e, args) {
      var ranges;
      if (!_grid.getEditorLock().isActive()) {
        if (e.which == $.ui.keyCode.ESCAPE) {
          if (_copiedRanges) {
            e.preventDefault();
            clearCopySelection();
            _self.onCopyCancelled.notify({ranges: _copiedRanges});
            _copiedRanges = null;
          }
        }

        if (e.which == 67 && (e.ctrlKey || e.metaKey)) {
          ranges = _grid.getSelectionModel().getSelectedRanges();
          if (ranges.length != 0) {
            e.preventDefault();
            _copiedRanges = ranges;
            markCopySelection(ranges);
            _self.onCopyCells.notify({ranges: ranges});
          }
        }

        if (e.which == 86 && (e.ctrlKey || e.metaKey)) {
          if (_copiedRanges) {
            e.preventDefault();
            clearCopySelection();
            ranges = _grid.getSelectionModel().getSelectedRanges();
            _self.onPasteCells.notify({from: _copiedRanges, to: ranges});
            _copiedRanges = null;
          }
        }
      }
    }

    function markCopySelection(ranges) {
      var columns = _grid.getColumns();
      var hash = {};
      for (var i = 0; i < ranges.length; i++) {
        for (var j = ranges[i].fromRow; j <= ranges[i].toRow; j++) {
          hash[j] = {};
          for (var k = ranges[i].fromCell; k <= ranges[i].toCell; k++) {
            hash[j][columns[k].id] = "copied";
          }
        }
      }
      _grid.setCellCssStyles("copy-manager", hash);
    }

    function clearCopySelection() {
      _grid.removeCellCssStyles("copy-manager");
    }

    $.extend(this, {
      "init": init,
      "destroy": destroy,
      "clearCopySelection": clearCopySelection,

      "onCopyCells": new Slick.Event(),
      "onCopyCancelled": new Slick.Event(),
      "onPasteCells": new Slick.Event()
    });
  }

  return CellCopyManager;
});
