/*
 * Copyright (C) 2022 - 2024. Henrik Bærbak Christensen, Aarhus University.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package hotstone.view.tool;

import hotstone.view.GfxConstants;
import hotstone.view.figure.HotStoneFigure;
import minidraw.framework.Drawing;
import minidraw.framework.Figure;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

/** A Helper class with a static method to compute the where cards are dropped with respect
 * to surrounding minions on the battlefield.
 */
public class DropZone {

  /** Given (x,y) of drop position of a card, and the current
   * MiniDraw drawing (with all figures) compute where that
   * card is dropped with respect to the already fielded minions that
   * belongs to the player.
   * @param drawing the MiniDrawDrawing
   * @param x X coordinate of dropped card
   * @param y Y coordinate of dropped card
   * @return an integer which encode which position relative to
   * the already fielded minions that this card is dropped to. The
   * encoding starts with 0 (left of first minion), 1 (between
   * first and second), 2 (between second and third), ..
   * #minions +1 (right of last minion). This is the same
   * encoding as used in the playCard method of Game.
   */
  public static int computeFieldIndexOfDropPosition(Drawing drawing, double x, double y) {
    // Create list of X coords of all my fielded minions
    List<Integer> listOfXCoordOfMyMinions = new ArrayList<>();
    for (Iterator<Figure> it = drawing.iterator(); it.hasNext(); ) {
      Figure f = it.next();
      // Only consider HotStoneFigures...
      if (f instanceof HotStoneFigure) {
        // ... whose Y position match my field position (== it is my minion)
        if (f.displayBox().y == GfxConstants.MY_FIELD_Y_POSITION) {
          listOfXCoordOfMyMinions.add(f.displayBox().x);
        }
      }
    }
    return DropZone.computeFieldIndexForDropAtX((int) x, listOfXCoordOfMyMinions);
  }


  /** Compute the index in the field where a minion should be inserted,
   * given it is dropped at a certain X coordinate.
   * @param droppedX the X coordinate where the minion is dropped on the UI
   * @param listOfXPositionOfMinions a list of X positions of all fielded minions to consider
   * @return index in the Games' battlefield array where the minion should be inserted
   */
  public static int computeFieldIndexForDropAtX(int droppedX, List<Integer> listOfXPositionOfMinions) {
    // Sort it in ascending order of X
    List<Integer> sortedXCoords = listOfXPositionOfMinions.stream().sorted().collect(Collectors.toList());
    // Find first index of a minion whose x is less than mouse x
    int index = -1; int i = 0;
    for (Integer minionX: sortedXCoords) {
      if (minionX <= droppedX) {
        index = i;}
      i++;
    }
    index += 1;
    return index;
  }
}