//
//  ContentView.swift
//  Tetris Mac
//
//  Created by Shadowfacts on 10/16/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import SwiftUI
import TetrisKit
import TetrisUI

struct ContentView: View {
    @ObservedObject var controller: GameController/* = {
        let c = GameController()
        c.start()
        return c
    }()*/
    @State var timer: Timer?

    var body: some View {
        GeometryReader { (geometry) in
            HStack(alignment: .top, spacing: 8) {
                VStack {
                    Text("Held")
                        .font(.title)
                        .fontWeight(.bold)
                    if self.controller.heldTetromino != nil {
                        Group {
                            TetrominoView(size: 100 / 4, tetromino: self.controller.heldTetromino!)
                        }.frame(width: 100, height: 100, alignment: .center)
                    } else {
                        Rectangle().foregroundColor(.clear).frame(width: 100, height: 100)
                    }
                    Text("Score")
                        .font(.title)
                        .fontWeight(.bold)
                    Text(verbatim: self.controller.score.description)
                        .font(.title)
                }
                    .padding(.leading, 8)
                
                BoardView(board: self.$controller.board, currentPiece: self.$controller.currentPiece, droppedPiece: self.$controller.currentPieceAtDropPoint)
                    .aspectRatio(CGSize(width: self.controller.width, height: self.controller.height), contentMode: .fit)
                    .onAppear(perform: self.startTimer)
                    .onDisappear(perform: self.stopTimer)
                
                VStack {
                    Text("Next")
                        .font(.title)
                        .fontWeight(.bold)
                    NextTetromioesView(size: 100, tetrominoes: self.controller.nextTetrominoes)
                        .frame(width: 100)
                }
                .padding(.trailing, 8)
            }
        }
            .frame(maxWidth: 634, maxHeight: 804)
    }
    
    func startTimer() {
        self.timer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true, block: { (_) in
            guard case .playing(_) = self.controller.state else {
                self.stopTimer()
                return
            }
            self.controller.step()
        })
    }
    
    func stopTimer() {
        self.timer?.invalidate()
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        let c = GameController()
        c.start()
        return ContentView(controller: c)
    }
}