Lights out

import SwiftUI

struct LightsOutApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

var SingleMode = false

struct ContentView: View {
    @State var buttons: [[ButtonState]] = Array(repeating: Array(repeating: ButtonState.off, count: columns), count: rows)

    var body: some View {
        HStack {
            VStack {
                ForEach(0..<rows, id: \.self) { row in
                    HStack {
                        ForEach(0..<columns, id: \.self) { column in
                            Button(action: {
                                buttonClick(row: row, column: column)
                            }) {
                                Text(buttons[row][column].text)
                                    .frame(width: 50, height: 50)
                                    .background(buttons[row][column].color)
                                    .border(Color.clear, width: 0)
                            }
                        }
                    }
                }
            }

            // Button on the left side
            Button(action: {
                if SingleMode == false {
                    SingleMode = true
                } else {
                    SingleMode = false
                }
            }) {
                Text("Single Toggle Mode")
                    .padding(10)
                    .background(Color.blue)
                    .foregroundColor(Color.white)
            }
        }
    }

    func buttonClick(row: Int, column: Int) {
        buttons[row][column].toggle()

        let neighbors = [(row - 1, column), (row + 1, column), (row, column - 1), (row, column + 1)]

        if SingleMode == false {
            for (neighborRow, neighborColumn) in neighbors {
                if (0..<rows).contains(neighborRow) && (0..<columns).contains(neighborColumn) {
                    buttons[neighborRow][neighborColumn].toggle()
                }
            }
        }
    }
}

enum ButtonState: Identifiable {
    case on, off

    var text: String {
        switch self {
        case .on:
            return ""
        case .off:
            return ""
        }
    }

    var color: Color {
        switch self {
        case .on:
            return Color.red
        case .off:
            return Color.green
        }
    }

    mutating func toggle() {
        self = (self == .on) ? .off : .on
    }

    var id: Int {
        text.hashValue
    }
}

let rows = 5
let columns = 5

@available(iOS 15.0, *)
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}