Tetris/TetrisUI/TetrominoView.swift

//
//  TetrominoView.swift
//  Tetris
//
//  Created by Shadowfacts on 10/15/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import SwiftUI
import TetrisKit

public struct TetrominoView: View {
    let tetromino: Tetromino
    
    public init(tetromino: Tetromino) {
        self.tetromino = tetromino
    }
    
    public var body: some View {
        GridView(rows: self.rows, columns: self.columns) { (col, row, size) in
            Rectangle()
                .foregroundColor(self.colorAt(col, row))
                .frame(width: size, height: size)
        }
    }
    
    var rows: Int {
        self.tetromino.shape.firstIndex(where: { row in
            row.allSatisfy({ el in
                !el
            })
        }) ?? self.tetromino.shape.count
    }
    
    var columns: Int {
        self.tetromino.shape.map { row in
            (row.firstIndex(where: { el in
                !el
            }) ?? row.count - 1) + 1
        }.max() ?? self.tetromino.shape.first!.count
    }
    
    func colorAt(_ col: Int, _ row: Int) -> Color {
        if row < tetromino.shape.count && col < tetromino.shape[row].count && tetromino.shape[row][col] {
            return tetromino.color
        } else {
            return .clear
        }
    }
}

struct TetrominoView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            TetrominoView(tetromino: .t)
            TetrominoView(tetromino: .i)
            TetrominoView(tetromino: .z)
            TetrominoView(tetromino: .j)
        }
    }
}