/// Copyright (c) 2021 Razeware LLC
/// 
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
/// 
/// This project and source code may use libraries or frameworks that are
/// released under various Open-Source licenses. Use of those libraries and
/// frameworks are governed by their own individual licenses.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import SwiftUI

enum DiscardedDirection {
  case left
  case right
}

struct CardView: View {
  @Binding var score: Int
  @Binding var deck: [String]
  
  let animalName: String
  let rotation = Angle(degrees: [0, 3.5, -10, -4.5, 6].randomElement()!)
  
  @State var revealed = false
  @State var offset: CGSize = .zero
  @GestureState var isLongPressed = false
  
  func drag(animal: String, direction: DiscardedDirection) -> Void {
    withAnimation(.easeIn) {
      switch direction {
      case .left:
        self.offset = .init(width: -1000, height: 0)
        score += 1
      case .right:
        self.offset = .init(width: 1000, height: 0)
      }
      
      if animal == deck.first {
        deck.removeAll()
      }
    }
  }
  
  var body: some View {
    let drag = DragGesture()
      .onChanged { self.offset = $0.translation }
      .onEnded {
        switch $0.translation.width {
        case let width where width < -100:
          self.drag(animal: self.animalName, direction: .left)
        case let width where width > 100:
          self.drag(animal: self.animalName, direction: .right)
        default:
          self.offset = .zero
        }
      }
    
    let longPress = LongPressGesture(
      minimumDuration: .greatestFiniteMagnitude,
      maximumDistance: .greatestFiniteMagnitude
    )
    .updating($isLongPressed) { value, state, _ in
      state = value
    }
    .simultaneously(with: drag)
    
    return ZStack {
      Rectangle()
        .foregroundColor(.white)
        .frame(width: 320, height: 210)
        .cornerRadius(12)
        .shadow(radius: isLongPressed ? 10 : 6)
      VStack {
        Image(animalName)
          .resizable()
          .scaledToFit()
          .foregroundColor(.indigo)
        if self.revealed {
          Text(animalName)
            .font(.largeTitle)
            .foregroundColor(.indigo)
        }
        Spacer()
      }
    }
    .rotationEffect(rotation)
    .frame(width: 320, height: 210)
    .offset(self.offset)
    .scaleEffect(isLongPressed ? 1.1 : 1)
    .animation(.spring(), value: isLongPressed)
    .gesture(
      TapGesture(count: 2)
        .onEnded {
          withAnimation {
            self.revealed = !self.revealed
          }
        }
        .exclusively(before: longPress)
    )
  }
}


struct CardView_Previews: PreviewProvider {
  static var previews: some View {
    CardView(score: .constant(0), deck: .constant(starterAnimals), animalName: "Pallas Cat")
  }
}
