package eecs2030.lab4;

import java.awt.Color;
import java.util.ArrayList;
import java.util.List;

/**
 * The standard 3x3 S-shaped Tetris block.
 * 
 * @author EECS2030 Fall 2016
 *
 */
public class SBlock extends Block {

    private List<BlockGrid> grids;
    private int gridIndex;

    /**
     * Create an S-block tetrimino at the given position and the given
     * color. The S-block is created with the starting orientation
     * as shown in the lab description.
     * 
     * @param pos the position of the S-block
     * @param col the color of the S-block
     */
    public SBlock(Point2 pos, Color col) {
        super(3, pos, col);

        this.grids = new ArrayList<BlockGrid>();

        BlockGrid g = this.grid;
        g.set(0, 1);
        g.set(0, 2);
        g.set(1, 0);
        g.set(1, 1);
        this.grids.add(g);

        g = new BlockGrid(3);
        g.set(0, 1);
        g.set(1, 1);
        g.set(1, 2);
        g.set(2, 2);
        this.grids.add(g);

        g = new BlockGrid(3);
        g.set(1, 1);
        g.set(1, 2);
        g.set(2, 0);
        g.set(2, 1);
        this.grids.add(g);

        g = new BlockGrid(3);
        g.set(0, 0);
        g.set(1, 0);
        g.set(1, 1);
        g.set(2, 1);
        this.grids.add(g);

        this.gridIndex = 0;
    }

    /**
     * Spins the block to the left (counter clockwise) by 90 degrees about its
     * center of rotation. The S
     * block center of rotation is 1.5 units right and 1.5 units down from the
     * top left corner of the 3x3 grid.
     * 
     */
    @Override
    public void spinLeft() {
        this.gridIndex--;
        if (this.gridIndex == -1) {
            this.gridIndex = 3;
        }
        this.grid = this.grids.get(this.gridIndex);
    }

    /**
     * Spins the block to the right (clockwise) by 90 degrees about its center
     * of rotation. The S block
     * center of rotation is 1.5 units right and 1.5 units down from the top
     * left corner of the 3x3 grid.
     * 
     */
    @Override
    public void spinRight() {
        this.gridIndex++;
        if (this.gridIndex == 4) {
            this.gridIndex = 0;
        }
        this.grid = this.grids.get(this.gridIndex);
    }

}