//
//  TriStateToggle.swift
//  Tusker
//
//  Created by Shadowfacts on 4/7/24.
//  Copyright © 2024 Shadowfacts. All rights reserved.
//

import SwiftUI

struct TriStateToggle: View {
    let titleKey: LocalizedStringKey
    @Binding var mode: Mode
    let onChange: (Bool) async -> Void
    @State private var isOn: Bool
    
    init(titleKey: LocalizedStringKey, mode: Binding<Mode>, onChange: @escaping (Bool) async -> Void) {
        self.titleKey = titleKey
        self._mode = mode
        self.onChange = onChange
        self.isOn = mode.wrappedValue == .on
    }
    
    var body: some View {
        toggleOrSpinner
            .onChange(of: mode) { newValue in
                switch newValue {
                case .off:
                    isOn = false
                case .loading:
                    break
                case .on:
                    isOn = true
                }
            }
    }
    
    @ViewBuilder
    private var toggleOrSpinner: some View {
        if mode == .loading {
            ProgressView()
        } else {
            Toggle(titleKey, isOn: Binding {
                isOn
            } set: { newValue in
                isOn = newValue
                mode = .loading
                Task {
                    await onChange(newValue)
                    mode = newValue ? .on : .off
                }
            })
            .labelsHidden()
        }
    }
    
    enum Mode {
        case off
        case loading
        case on
    }
}


#Preview {
    @State var mode = TriStateToggle.Mode.on
    return TriStateToggle(titleKey: "", mode: $mode) { _ in
        try! await Task.sleep(nanoseconds: NSEC_PER_SEC)
    }
}