Tetris/TetrisKit/GameBoard.swift

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

import Foundation

public struct GameBoard {
    
    public let width: Int
    public let height: Int
    public internal(set) var tiles: [[Tetromino?]]

    public init(width: Int, height: Int) {
        self.width = width
        self.height = height
        tiles = (1...height).map { _ in
            Array(repeating: nil, count: width)
        }
    }
    
    public subscript(x: Int, y: Int) -> Bool {
        return self.tiles[y][x] != nil
    }
    
    public subscript(x: Int, y: Int) -> Tetromino? {
        return self.tiles[y][x]
    }
    
    public mutating func set(piece: GamePiece) {
        let (left, top) = piece.topLeft
        
        for y in 0..<piece.tiles.count where y + top < height {
            for x in 0..<piece.tiles.first!.count where x + left < width {
                if piece.tiles[y][x] {
                    self.tiles[y + top][x + left] = piece.tetromino
                }
            }
        }
    }
    
    mutating func clear(tiles: [(Int, Int)]) {
        for (x, y) in tiles {
            self.tiles[y][x] = nil
        }
    }
    
    func rowFull(_ row: Int) -> Bool {
        return tiles[row].allSatisfy({ $0 != nil })
    }
}