Tetris/TetrisKit/GamePiece.swift

//
//  GamePiece.swift
//  TetrisKit
//
//  Created by Shadowfacts on 10/13/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import Foundation

public struct GamePiece {
    public let tetromino: Tetromino
    public var topLeft: (Int, Int)
    public internal(set) var rotation: Double = 0
    public internal(set) var tiles: [[Bool]]

    public init(tetromino: Tetromino, topLeft: (Int, Int) = (0, 0)) {
        self.tetromino = tetromino
        self.tiles = tetromino.shape
        self.topLeft = topLeft
    }
    
    mutating func rotate(direction: RotationDirection) {
        switch direction {
        case .clockwise:
            self.tiles.rotateClockwise()
            rotation += 90
        case .counterClockwise:
            self.tiles.rotateCounterclockwise()
            rotation -= 90
        }
    }
}

public enum RotationDirection {
    case clockwise, counterClockwise
}

extension GamePiece {
    public func moved(by: (Int, Int)) -> GamePiece {
        var modified = self
        modified.topLeft = (topLeft.0 + by.0, topLeft.1 + by.1)
        return modified
    }
    public func rotated(_ direction: RotationDirection) -> GamePiece {
        var modified = self
        modified.rotate(direction: direction)
        return modified
    }
}