//
//  ContentView.swift
//  Memorize
//
//  Created by ching on 2023/2/12.
//

import SwiftUI

struct ContentView: View {
    var emojis = ["🚌", "🚙", "🚗", "🚕", "🏎", "🚎", "🚓"]
    @State var emojiCount = 2
    var body: some View {
        VStack {
            ScrollView {
                LazyVGrid(columns: [GridItem(.adaptive(minimum: 65))]) {
                    ForEach(emojis[0..<emojiCount], id: \.self) {
                        emoji in CardView(content: emoji).aspectRatio(2/3, contentMode: .fit)
                    }
                }
            }
            .foregroundColor(/*@START_MENU_TOKEN@*/.red/*@END_MENU_TOKEN@*/)
            Spacer()
            HStack{
                remove
                Spacer()
                add
            }
            .padding(.horizontal)
            .font(.largeTitle)
        }
        .padding(.horizontal)
    }
    
    var remove: some View {
        Button(action: {
            if emojiCount > 1{
                emojiCount -= 1
            }
        }, label: {
            Image(systemName: "minus.circle")
        })
    }
    var add: some View {
        Button(action: {
            if emojiCount < emojis.count {
                emojiCount += 1
            }
        }, label: {
            Image(systemName: "plus.circle")
        })
    }
}

struct CardView: View {
    @State var isFaceUp: Bool = true
    var content: String
    var body: some View {
        ZStack {
            let shape = RoundedRectangle(cornerRadius: 20.0)
            if isFaceUp {
                shape
                    .fill()
                    .foregroundColor(.white)
                shape
                    .strokeBorder(lineWidth: 3)
                Text(content)
                    .font(.largeTitle)
            }
            else {
                shape
                    .fill()
            }
        }
        .onTapGesture {
            isFaceUp = !isFaceUp
        }
    }
}












struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .preferredColorScheme(.dark)
        ContentView()
            .preferredColorScheme(.light)
    }
}