//
//  MeditationView.swift
//  ZazenTimer
//
//  Created by Joshua Brunhuber on 15.08.19.
//  Copyright © 2019 Joshua Brunhuber. All rights reserved.
//

import SwiftUI
import Combine

struct MeditationView: View {

    @EnvironmentObject var controller: TimerController

    @State private var remainingMeditationTime: String = "-"

    var body: some View {

        VStack {
            if self.controller.navigation == .meditating {
                VStack(spacing: 100) {
                    Spacer()
                    Text(remainingMeditationTime).font(Font.monospacedDigit(.title)())

                    Button(action: {
                        self.controller.stop()
                        self.controller.navigation = .timer
                        self.controller.inSession = false
                    }) {
                        Text("Abort").foregroundColor(.primary).bold().padding()
                    }
                    .background(Color.primary.opacity(0.1))
                    .cornerRadius(10)
                    .opacity(0.3)
                    Spacer()
                }
            } else if self.controller.navigation == .finished {
                FinishedView().animation(.easeIn)
            }
        }.onAppear {
            self.controller.start()

            self.controller.currentTimePublisher.map { _ in

                self.controller.decreaseRemaining()
                return self.controller.makeRemainingTimeText()
            }
            .sink { value in
                self.remainingMeditationTime = value
            }.store(in: &self.controller.connections)
        }.navigationBarBackButtonHidden(true)
    }
}

#if DEBUG
struct MeditationView_Previews: PreviewProvider {
    static var previews: some View {

        let testController = TimerController()
        testController.durationPickerValue = 5
        testController.navigation = .meditating
        let view = MeditationView().environmentObject(testController)
        return view
    }
}
#endif