// CoachLiveActivityWidget.swift
// Définition Widget pour la Live Activity (Lock Screen + Dynamic Island).
// Structure validée sur le template Apple Xcode 26.5 (Widget Extension /
// LiveActivity.swift) + SDK swiftinterface WidgetKit iOS 26.5
// (DynamicIsland init signature : expanded:compactLeading:compactTrailing:minimal:).

import ActivityKit
import WidgetKit
import SwiftUI

struct CoachLiveActivityWidget: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: CoachLiveActivityAttributes.self) { context in
            // ─── Lock screen / banner ─────────────────────────────────────
            lockScreenView(context: context)
                .activityBackgroundTint(Color.black.opacity(0.55))
                .activitySystemActionForegroundColor(.white)

        } dynamicIsland: { context in
            DynamicIsland {
                // Expanded UI (long-press l'île)
                DynamicIslandExpandedRegion(.leading) {
                    metricExpanded(label: "FC",
                                   value: hrText(context.state),
                                   color: .red,
                                   symbol: "heart.fill")
                }
                DynamicIslandExpandedRegion(.trailing) {
                    metricExpanded(label: "Kcal",
                                   value: kcalText(context.state),
                                   color: .green,
                                   symbol: "flame.fill")
                }
                DynamicIslandExpandedRegion(.center) {
                    Label(context.attributes.activityLabel,
                          systemImage: context.attributes.activitySymbol)
                        .font(.caption2.weight(.semibold))
                        .foregroundStyle(.secondary)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    HStack(spacing: 18) {
                        metricInline(label: "Distance",
                                     value: distKmText(context.state),
                                     unit: "km",
                                     color: .orange)
                        Divider().frame(height: 28)
                        metricInline(label: "Durée",
                                     value: elapsedText(context.state.elapsedSec),
                                     unit: "",
                                     color: .white)
                    }
                    .frame(maxWidth: .infinity)
                }
            } compactLeading: {
                HStack(spacing: 3) {
                    Image(systemName: "heart.fill")
                        .foregroundStyle(.red)
                    Text(hrText(context.state))
                        .font(.caption2.weight(.bold).monospacedDigit())
                }
            } compactTrailing: {
                Text(elapsedText(context.state.elapsedSec))
                    .font(.caption2.weight(.semibold).monospacedDigit())
                    .foregroundStyle(.white)
            } minimal: {
                Image(systemName: "heart.fill")
                    .foregroundStyle(.red)
                    .symbolEffect(.pulse, isActive: context.state.isLive)
            }
            .keylineTint(.red)
        }
    }

    // MARK: - Lock screen layout

    @ViewBuilder
    private func lockScreenView(context: ActivityViewContext<CoachLiveActivityAttributes>) -> some View {
        VStack(spacing: 12) {
            HStack(spacing: 8) {
                Image(systemName: context.attributes.activitySymbol)
                    .foregroundStyle(.white)
                Text(context.attributes.activityLabel)
                    .font(.headline)
                Spacer()
                Image(systemName: "heart.fill")
                    .foregroundStyle(.red)
                    .symbolEffect(.pulse, isActive: context.state.isLive)
                Text(context.state.isLive ? "En direct" : "Connexion perdue")
                    .font(.caption.weight(.semibold))
                    .foregroundStyle(context.state.isLive ? .green : .orange)
            }
            HStack(spacing: 14) {
                metricBlock(value: hrText(context.state),  unit: "bpm",    color: .red)
                metricBlock(value: kcalText(context.state), unit: "kcal",   color: .green)
                metricBlock(value: distKmText(context.state), unit: "km",   color: .orange)
                metricBlock(value: elapsedText(context.state.elapsedSec), unit: "", color: .white)
            }
        }
        .padding(.horizontal, 14)
        .padding(.vertical, 12)
    }

    @ViewBuilder
    private func metricBlock(value: String, unit: String, color: Color) -> some View {
        VStack(spacing: 0) {
            Text(value)
                .font(.system(.title3, design: .rounded).weight(.heavy).monospacedDigit())
                .foregroundStyle(color)
            if !unit.isEmpty {
                Text(unit).font(.caption2).foregroundStyle(.secondary)
            }
        }
        .frame(maxWidth: .infinity)
    }

    @ViewBuilder
    private func metricExpanded(label: String, value: String, color: Color, symbol: String) -> some View {
        VStack(alignment: .leading, spacing: 2) {
            Label(label, systemImage: symbol)
                .font(.caption2.weight(.semibold))
                .foregroundStyle(color)
            Text(value)
                .font(.title2.weight(.heavy).monospacedDigit())
                .foregroundStyle(color)
        }
    }

    @ViewBuilder
    private func metricInline(label: String, value: String, unit: String, color: Color) -> some View {
        HStack(spacing: 4) {
            Text(label).font(.caption2).foregroundStyle(.secondary)
            Text(value).font(.callout.weight(.bold).monospacedDigit()).foregroundStyle(color)
            if !unit.isEmpty {
                Text(unit).font(.caption2).foregroundStyle(.tertiary)
            }
        }
    }

    // MARK: - Formatters (dupliqués ici car non-import de LiveStore depuis l'extension)

    private func hrText(_ s: CoachLiveActivityAttributes.ContentState) -> String {
        s.heartRate > 0 ? "\(Int(s.heartRate.rounded()))" : "—"
    }
    private func kcalText(_ s: CoachLiveActivityAttributes.ContentState) -> String {
        s.activeEnergyKcal > 0 ? "\(Int(s.activeEnergyKcal.rounded()))" : "—"
    }
    private func distKmText(_ s: CoachLiveActivityAttributes.ContentState) -> String {
        s.distanceMeters > 0 ? String(format: "%.2f", s.distanceMeters / 1000) : "—"
    }
    private func elapsedText(_ sec: TimeInterval) -> String {
        let total = Int(sec)
        let h = total / 3600
        let m = (total % 3600) / 60
        let s = total % 60
        if h > 0 { return "\(h):\(String(format: "%02d", m)):\(String(format: "%02d", s))" }
        return "\(m):\(String(format: "%02d", s))"
    }
}