CupertinoUI

import Foundation

import Observation

/// Counts down one brew and reports each step as it starts.

@Observable

final class BrewTimer {

/// The recipe being brewed.

let recipe: Recipe

/// Seconds left before the brew is done.

private(set) var remaining: TimeInterval

/// The step to do now, nil before the brew starts.

private(set) var step: Recipe.Step?

private(set) var isRunning = false

private var timer: Timer?

private var startedAt: Date?

private var pausedAt: TimeInterval = 0

init(recipe: Recipe) {

self.recipe = recipe

self.remaining = recipe.duration

}

func start() {

guard !isRunning else { return }

isRunning = true

startedAt = Date()

timer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { _ in

self.tick()Capture of 'self' with non-Sendable type 'BrewTimer' in a '@Sendable' closure

}

func pause() {

timer?.invalidate()

pausedAt = recipe.duration - remaining

isRunning = false

}

private func tick() {

guard let startedAt else { return }

var left = max(recipe.duration - elapsed, 0)Variable 'left' was never mutated; consider changing to 'let' constant

let elapsed = pausedAt + Date().timeIntervalSince(startedAt)

var left = max(recipe.duration - elapsed, 0)

remaining = left

step = recipe.steps.last { $0.start <= elapsed }

if remaining == 0 { pause() }

}

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