workouts/Workouts/Views/WorkoutLogs/WorkoutSummaryView.swift

//
// WorkoutSummaryView.swift
// Workouts
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import SwiftUI
import SwiftData

/// Post-workout summary shown right after a workout finishes. Queried by id so the
/// health metrics (calories, heart rate) fill in live as they arrive — from the
/// watch over the bridge, or from the phone's estimate a few seconds after ending.
struct WorkoutSummaryView: View {
    @Environment(\.dismiss) private var dismiss
    @Query private var workouts: [Workout]
    let onDone: () -> Void

    init(workoutID: String, onDone: @escaping () -> Void) {
        self.onDone = onDone
        _workouts = Query(filter: #Predicate<Workout> { $0.id == workoutID })
    }

    private var workout: Workout? { workouts.first }

    var body: some View {
        NavigationStack {
            Group {
                if let workout {
                    ScrollView {
                        VStack(spacing: 20) {
                            Image(systemName: "checkmark.seal.fill")
                                .font(.system(size: 48))
                                .foregroundStyle(.green)
                                .padding(.top, 8)
                            Text(workout.splitName ?? Split.unnamed)
                                .font(.title2.bold())

                            WorkoutMetricsView(workout: workout)

                            if workout.metrics == nil {
                                Label("Saving to Apple Health…", systemImage: "heart.text.square")
                                    .font(.footnote)
                                    .foregroundStyle(.secondary)
                            }
                        }
                        .padding()
                    }
                } else {
                    // The workout was removed (e.g. discarded) — nothing to summarize.
                    ContentUnavailableView("Workout Ended", systemImage: "checkmark.circle")
                }
            }
            .navigationTitle("Summary")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .confirmationAction) {
                    Button("Done") { onDone() }
                }
            }
        }
    }
}

// MARK: - Metric tiles (shared by the summary sheet and the per-workout detail)

/// Renders the available health/strength metrics for a finished workout as a tile
/// grid plus an optional heart-rate-zone bar. Reused by `WorkoutSummaryView` and the
/// completed-workout detail section.
struct WorkoutMetricsView: View {
    let workout: Workout
    @AppStorage("weightUnit") private var weightUnit: WeightUnit = .lb

    private var metrics: WorkoutMetrics? { workout.metrics }

    private var durationSeconds: Int? {
        guard let end = workout.end else { return nil }
        return max(0, Int(end.timeIntervalSince(workout.start)))
    }

    private var volume: Double {
        metrics?.totalVolume ?? WorkoutVolume.total(WorkoutDocument(from: workout).logs)
    }

    var body: some View {
        VStack(spacing: 16) {
            LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible())], spacing: 12) {
                if let durationSeconds {
                    MetricTile(icon: "clock.fill", tint: .blue, value: durationText(durationSeconds), label: "Duration")
                }
                if let kcal = metrics?.activeEnergyKcal {
                    MetricTile(icon: "flame.fill", tint: .orange, value: "\(Int(kcal.rounded()))", label: "Active cal")
                }
                if let avg = metrics?.avgHeartRate {
                    MetricTile(icon: "heart.fill", tint: .red, value: "\(Int(avg.rounded()))", label: "Avg BPM")
                }
                if let max = metrics?.maxHeartRate {
                    MetricTile(icon: "bolt.heart.fill", tint: .pink, value: "\(Int(max.rounded()))", label: "Max BPM")
                }
                if volume > 0 {
                    MetricTile(icon: "scalemass.fill", tint: .purple, value: volumeText, label: "Volume")
                }
            }

            if let zones = metrics?.hrZoneSeconds, zones.contains(where: { $0 > 0 }) {
                HRZoneBar(zoneSeconds: zones)
            }

            if metrics?.source == .phoneEstimate {
                Text("Calories estimated — wear your Apple Watch for measured stats.")
                    .font(.caption2)
                    .foregroundStyle(.secondary)
                    .multilineTextAlignment(.center)
            }
        }
    }

    private var volumeText: String {
        "\(Int(volume.rounded())) \(weightUnit.abbreviation)"
    }

    private func durationText(_ seconds: Int) -> String {
        let minutes = seconds / 60
        if minutes >= 60 { return "\(minutes / 60)h \(minutes % 60)m" }
        return "\(minutes)m \(seconds % 60)s"
    }
}

struct MetricTile: View {
    let icon: String
    let tint: Color
    let value: String
    let label: String

    var body: some View {
        VStack(spacing: 4) {
            Image(systemName: icon)
                .font(.title2)
                .foregroundStyle(tint)
            Text(value)
                .font(.title3.bold())
                .monospacedDigit()
            Text(label)
                .font(.caption2)
                .foregroundStyle(.secondary)
        }
        .frame(maxWidth: .infinity)
        .padding(.vertical, 10)
        .background(.quaternary.opacity(0.4), in: RoundedRectangle(cornerRadius: 12))
    }
}

/// Proportional stacked bar of time spent in each of the 5 heart-rate zones (low→high).
struct HRZoneBar: View {
    let zoneSeconds: [Double]

    private let colors: [Color] = [.blue, .green, .yellow, .orange, .red]

    var body: some View {
        let total = max(zoneSeconds.reduce(0, +), 1)
        VStack(alignment: .leading, spacing: 6) {
            Text("Heart Rate Zones")
                .font(.caption)
                .foregroundStyle(.secondary)
            GeometryReader { geo in
                HStack(spacing: 2) {
                    ForEach(0..<5, id: \.self) { zone in
                        if zoneSeconds[zone] > 0 {
                            colors[zone]
                                .frame(width: max(2, geo.size.width * (zoneSeconds[zone] / total)))
                        }
                    }
                }
            }
            .frame(height: 12)
            .clipShape(Capsule())
        }
        .frame(maxWidth: .infinity, alignment: .leading)
    }
}