import Foundation
import Testing
@testable import Workouts_Watch_App

/// Locks the small pure helpers the watch UI leans on: the run-flow duration label, the
/// weight-unit formatter, the workout-volume roll-up the watch attaches to finished sessions,
/// and the heart-rate zone bucketing the live session folds sensor time into. All pure — no
/// SwiftUI host, no `HKWorkoutSession`.
struct WatchHelpersTests {

    // MARK: - ExerciseProgressView.durationLabel (run-flow "m/s" footer)

    @Test func durationLabelFormatsMinutesAndSeconds() {
        #expect(ExerciseProgressView.durationLabel(90) == "1m 30s")
        #expect(ExerciseProgressView.durationLabel(605) == "10m 5s")
    }

    @Test func durationLabelDropsWholeSecondsAndWholeMinutes() {
        #expect(ExerciseProgressView.durationLabel(60) == "1 min")
        #expect(ExerciseProgressView.durationLabel(120) == "2 min")
        #expect(ExerciseProgressView.durationLabel(45) == "45 sec")
        #expect(ExerciseProgressView.durationLabel(0) == "0 sec")
    }

    // MARK: - WeightUnit.format (watch row / picker subtitle)

    @Test func weightUnitFormatsWithAbbreviation() {
        #expect(WeightUnit.lb.format(135) == "135 lb")
        #expect(WeightUnit.kg.format(60) == "60 kg")
        #expect(WeightUnit.lb.format(0) == "0 lb")
    }

    // MARK: - WorkoutVolume.total (metric the watch fills on finish)

    private static let ts = Date(timeIntervalSince1970: 1_700_000_000)

    private func log(id: String, sets: Int, reps: Int, weight: Double, loadType: LoadType) -> WorkoutLogDocument {
        WorkoutLogDocument(
            id: id, exerciseName: "Ex-\(id)", order: 0, sets: sets, reps: reps, weight: weight,
            loadType: loadType.rawValue, durationSeconds: 0, currentStateIndex: 0,
            status: WorkoutStatus.completed.rawValue, notes: nil, date: Self.ts
        )
    }

    @Test func workoutVolumeSumsSetsRepsWeightAcrossWeightedLogs() {
        let logs = [
            log(id: "A", sets: 4, reps: 10, weight: 135, loadType: .weight),   // 5400
            log(id: "B", sets: 3, reps: 8, weight: 100, loadType: .weight),    // 2400
        ]
        #expect(WorkoutVolume.total(logs) == 7800)
    }

    @Test func workoutVolumeExcludesNonWeightedLogs() {
        let logs = [
            log(id: "A", sets: 4, reps: 10, weight: 135, loadType: .weight),   // 5400
            log(id: "B", sets: 3, reps: 30, weight: 999, loadType: .duration), // excluded (timed)
            log(id: "C", sets: 2, reps: 5, weight: 50, loadType: .none),       // excluded (no load)
        ]
        #expect(WorkoutVolume.total(logs) == 5400)
    }

    @Test func workoutVolumeOfNoLogsIsZero() {
        #expect(WorkoutVolume.total([]) == 0)
    }

    // MARK: - WorkoutSessionManager.zoneIndex (HR zone bucketing)

    @Test func zoneIndexBucketsByFractionOfMaxHeartRate() {
        let maxHR = 200.0   // thresholds land on 120 / 140 / 160 / 180 bpm
        #expect(WorkoutSessionManager.zoneIndex(for: 100, maxHR: maxHR) == 0)   // 50%  → zone 0
        #expect(WorkoutSessionManager.zoneIndex(for: 119, maxHR: maxHR) == 0)   // <60% → zone 0
        #expect(WorkoutSessionManager.zoneIndex(for: 120, maxHR: maxHR) == 1)   // 60%  → zone 1
        #expect(WorkoutSessionManager.zoneIndex(for: 140, maxHR: maxHR) == 2)   // 70%  → zone 2
        #expect(WorkoutSessionManager.zoneIndex(for: 160, maxHR: maxHR) == 3)   // 80%  → zone 3
        #expect(WorkoutSessionManager.zoneIndex(for: 180, maxHR: maxHR) == 4)   // 90%  → zone 4
        #expect(WorkoutSessionManager.zoneIndex(for: 220, maxHR: maxHR) == 4)   // over max → still 4
    }
}