//
// ExerciseProgressControlView 2.swift
// Workouts
//
// Created by rzen on 7/23/25 at 9:15 AM.
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import SwiftUI

struct ExerciseProgressControlView: View {
    let log: WorkoutLog
    @Environment(\.dismiss) private var dismiss
    @Environment(\.modelContext) private var modelContext
    
    @State private var exerciseStates: [ExerciseState] = []
    @State private var currentStateIndex: Int = 0
    @State private var elapsedSeconds: Int = 0
    @State private var timer: Timer? = nil
    @State private var previousStateIndex: Int = 0
    
    var body: some View {
        TabView(selection: $currentStateIndex) {
            ForEach(Array(exerciseStates.enumerated()), id: \.element.id) { index, state in
                if state.isIntro {
                    ExerciseIntroCard(log: log)
                        .tag(index)
                    
                } else if state.isSet {
                    ExerciseSetCard(set: state.setNumber ?? 0, elapsedSeconds: elapsedSeconds)
                        .tag(index)
                    
                } else if state.isRest {
                    ExerciseRestCard(elapsedSeconds: elapsedSeconds)
                        .tag(index)
                    
                } else if state.isDone {
                    ExerciseDoneCard(elapsedSeconds: elapsedSeconds, onComplete: completeExercise)
                        .tag(index)

                }
            }
        }
        .tabViewStyle(.page(indexDisplayMode: .never))
        .onChange(of: currentStateIndex) { oldValue, newValue in
            if oldValue != newValue {
                elapsedSeconds = 0
                moveToNextState()
            }
        }
        .onAppear {
            setupExerciseStates()
            currentStateIndex = log.currentStateIndex ?? 0
            startTimer()
        }
        .onDisappear {
            stopTimer()
        }
    }
    
    private func setupExerciseStates() {
        var states: [ExerciseState] = []
        states.append(.intro)
        for i in 1...log.sets {
            states.append(.set(number: i))
            if i < log.sets {
                states.append(.rest(afterSet: i))
            }
        }
        states.append(.done)
        exerciseStates = states
    }
    
    private func startTimer() {
        timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in
            elapsedSeconds += 1
            
            // Check if we need to provide haptic feedback during rest periods
            if currentStateIndex >= 0 && currentStateIndex < exerciseStates.count {                
                let currentState = exerciseStates[currentStateIndex]
                if currentState.isRest {
                    provideRestHapticFeedback()
                } else if currentState.isDone && elapsedSeconds >= 10 {
                    // Auto-complete after 10 seconds on the DONE state
                    completeExercise()
                }
            }
        }
    }
    
    private func stopTimer() {
        timer?.invalidate()
        timer = nil
    }
    
    private func moveToNextState() {
        if currentStateIndex < exerciseStates.count - 1 {
            elapsedSeconds = 0
            withAnimation {
                currentStateIndex += 1
                log.currentStateIndex = currentStateIndex
                log.elapsedSeconds = elapsedSeconds
                log.status = .inProgress
                try? modelContext.save()
            }
        } else {
            // We've reached the end (DONE state)
            completeExercise()
        }
    }
    
    private func provideRestHapticFeedback() {
        // Provide haptic feedback based on elapsed time
        if elapsedSeconds % 60 == 0 && elapsedSeconds > 0 {
            // Triple tap every 60 seconds
            HapticFeedback.tripleTap()
        } else if elapsedSeconds % 30 == 0 && elapsedSeconds > 0 {
            // Double tap every 30 seconds
            HapticFeedback.doubleTap()
        } else if elapsedSeconds % 10 == 0 && elapsedSeconds > 0 {
            // Single tap every 10 seconds
            HapticFeedback.success()
        }
    }
    
    private func completeExercise() {
        // Update the workout log status to completed
        log.status = .completed
        
        // reset index in case we wish to re-run the exercise
        log.currentStateIndex = 0
                
        // Provide "tada" haptic feedback
        HapticFeedback.tripleTap()
        
        // Dismiss this view to return to WorkoutDetailView
        dismiss()
    }
}