/*
 * Jalview - A Sequence Alignment Editor and Viewer (Version 2.9)
 * Copyright (C) 2015 The Jalview Authors
 * 
 * This file is part of Jalview.
 * 
 * Jalview is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License 
 * as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *  
 * Jalview is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty 
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
 * PURPOSE.  See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
 * The Jalview Authors are detailed in the 'AUTHORS' file.
 */
package jalview.commands;

import jalview.datamodel.AlignmentI;
import jalview.datamodel.ColumnSelection;
import jalview.datamodel.SequenceGroup;
import jalview.datamodel.SequenceI;
import jalview.util.ShiftList;

import java.util.List;

public class TrimRegionCommand extends EditCommand
{
  public static String TRIM_LEFT = "TrimLeft";

  public static String TRIM_RIGHT = "TrimRight";

  public ColumnSelection colSel = null;

  int[] start;

  ShiftList shiftList;

  SequenceGroup selectionGroup;

  List<int[]> deletedHiddenColumns;

  int columnsDeleted;

  public TrimRegionCommand(String description, String command,
          SequenceI[] seqs, int column, AlignmentI al,
          ColumnSelection colSel, SequenceGroup selectedRegion)
  {
    this.description = description;
    this.selectionGroup = selectedRegion;
    this.colSel = colSel;
    if (command.equalsIgnoreCase(TRIM_LEFT))
    {
      if (column == 0)
      {
        return;
      }

      columnsDeleted = column;

      setEdit(new Edit(Action.CUT, seqs, 0, column, al));
    }
    else if (command.equalsIgnoreCase(TRIM_RIGHT))
    {
      int width = al.getWidth() - column - 1;
      if (width < 2)
      {
        return;
      }

      columnsDeleted = width - 1;

      setEdit(new Edit(Action.CUT, seqs, column + 1, width, al));
    }

    // We need to keep a record of the sequence start
    // in order to restore the state after a redo
    int i, isize = getEdit(0).seqs.length;
    start = new int[isize];
    for (i = 0; i < isize; i++)
    {
      start[i] = getEdit(0).seqs[i].getStart();
    }

    performEdit(0, null);
  }

  void cut(Edit command)
  {
    int column, j, jSize = command.seqs.length;
    for (j = 0; j < jSize; j++)
    {
      if (command.position == 0)
      {
        // This is a TRIM_LEFT command
        column = command.seqs[j].findPosition(command.number);
        command.seqs[j].setStart(column);
      }
      else
      {
        // This is a TRIM_RIGHT command
        column = command.seqs[j].findPosition(command.position) - 1;
        command.seqs[j].setEnd(column);
      }
    }

    super.cut(command, null);

    if (command.position == 0)
    {
      deletedHiddenColumns = colSel.compensateForEdit(0, command.number);
      if (selectionGroup != null)
      {
        selectionGroup.adjustForRemoveLeft(command.number);
      }
    }
    else
    {
      deletedHiddenColumns = colSel.compensateForEdit(command.position,
              command.number);
      if (selectionGroup != null)
      {
        selectionGroup.adjustForRemoveRight(command.position);
      }
    }
  }

  void paste(Edit command)
  {
    super.paste(command, null);
    int column, j, jSize = command.seqs.length;
    for (j = 0; j < jSize; j++)
    {
      if (command.position == 0)
      {
        command.seqs[j].setStart(start[j]);
      }
      else
      {
        column = command.seqs[j].findPosition(command.number
                + command.position) - 1;
        command.seqs[j].setEnd(column);
      }
    }

    if (command.position == 0)
    {
      colSel.compensateForEdit(0, -command.number);
      if (selectionGroup != null)
      {
        selectionGroup.adjustForRemoveLeft(-command.number);
      }
    }

    if (deletedHiddenColumns != null)
    {
      int[] region;
      for (int i = 0; i < deletedHiddenColumns.size(); i++)
      {
        region = deletedHiddenColumns.get(i);
        colSel.hideColumns(region[0], region[1]);
      }
    }
  }

  public int getSize()
  {
    return columnsDeleted;
  }

}