//
//  WorkoutStateManager.swift
//  WorkoutsPlus
//
//  Created by Felix Förtsch on 21.11.24.
//

import SwiftUI
import SwiftData

@Observable
final class WorkoutStateManager {
		private let modelContext: ModelContext
		private(set) var activeWorkoutSession: WorkoutSession?
		var isWorkoutInProgress: Bool { activeWorkoutSession != nil }
		
		init(modelContext: ModelContext) {
				self.modelContext = modelContext
		}
		
		func startWorkout(_ workout: Workout) {
				let session = WorkoutSession(start: workout)
				modelContext.insert(session)
				activeWorkoutSession = session
		}
		
		func stopWorkout() {
				if let _ = activeWorkoutSession {
						activeWorkoutSession = nil
				}
		}
		
		func cancelWorkout(context: ModelContext) {
				if let session = activeWorkoutSession {
						context.delete(session)
						activeWorkoutSession = nil
				}
		}
		
		func prevExercise() {
				if let session = activeWorkoutSession {
						session.workoutSessionItems[session.currentExercise].startDate = Date.now
						if session.currentExercise > 0 {
								session.currentExercise -= 1
						}
				}
		}
		
		func nextExercise() {
				if let session = activeWorkoutSession {
						session.workoutSessionItems[session.currentExercise].stopDate = Date.now
						if session.currentExercise < session.workoutSessionItems.count - 1 {
								session.currentExercise += 1
						}
				}
		}
		
		func getWorkoutDuration() -> String {
				activeWorkoutSession?.getFormattedDuration() ?? "00:00:00"
		}
}