jrshikoku/targets/widget/TrainFollowLiveActivity.swift

import ActivityKit
import SwiftUI
import WidgetKit

// MARK: - 列車追従 Live Activity

// MARK: Lock screen / notification banner

private struct TrainFollowBannerView: View {
    let context: ActivityViewContext<TrainFollowAttributes>

    private var delayColor: Color {
        context.state.delayMinutes > 0 ? .red : Color(red: 0, green: 0.72, blue: 0.42)
    }

    var body: some View {
        VStack(spacing: 0) {
            // Header
            HStack {
                Image(systemName: "tram.fill")
                    .foregroundColor(.white)
                Text("\(context.attributes.lineName)  \(context.attributes.trainNumber)")
                    .font(.subheadline).fontWeight(.bold)
                    .foregroundColor(.white)
                Spacer()
                Text(context.attributes.destination + "行き")
                    .font(.caption)
                    .foregroundColor(.white.opacity(0.9))
            }
            .padding(.horizontal, 14)
            .padding(.vertical, 8)
            .background(Color(red: 0, green: 0.6, blue: 0.8))

            // Body
            HStack(spacing: 0) {
                // Current station
                VStack(spacing: 2) {
                    Text("現在")
                        .font(.caption2)
                        .foregroundColor(.secondary)
                    Text(context.state.currentStation)
                        .font(.headline)
                        .fontWeight(.semibold)
                        .lineLimit(1)
                        .minimumScaleFactor(0.7)
                }
                .frame(maxWidth: .infinity)

                Image(systemName: "chevron.right.2")
                    .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
                    .font(.title3)

                // Next station
                VStack(spacing: 2) {
                    Text("次の停車駅")
                        .font(.caption2)
                        .foregroundColor(.secondary)
                    Text(context.state.nextStation)
                        .font(.headline)
                        .fontWeight(.bold)
                        .lineLimit(1)
                        .minimumScaleFactor(0.7)
                        .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
                }
                .frame(maxWidth: .infinity)

                Divider()
                    .padding(.vertical, 4)

                // Delay + arrival
                VStack(spacing: 2) {
                    if context.state.delayMinutes > 0 {
                        Text("\(context.state.delayMinutes)分遅れ")
                            .font(.caption)
                            .fontWeight(.bold)
                            .foregroundColor(delayColor)
                    } else {
                        Text("定刻")
                            .font(.caption)
                            .foregroundColor(delayColor)
                    }
                    Text("着 \(context.state.scheduledArrival)")
                        .font(.caption2)
                        .foregroundColor(.secondary)
                }
                .frame(maxWidth: .infinity)
            }
            .padding(.horizontal, 14)
            .padding(.vertical, 10)
        }
    }
}

// MARK: Dynamic Island — expanded

private struct TrainFollowExpandedView: View {
    let context: ActivityViewContext<TrainFollowAttributes>

    var body: some View {
        VStack(spacing: 4) {
            // Top row: line + train number
            HStack {
                Label(context.attributes.lineName, systemImage: "tram.fill")
                    .font(.caption)
                    .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
                Spacer()
                Text(context.attributes.trainNumber)
                    .font(.caption).fontWeight(.semibold)
                Text("→")
                Text(context.attributes.destination)
                    .font(.caption).fontWeight(.semibold)
            }

            Divider()

            // Station row
            HStack {
                Text(context.state.currentStation)
                    .font(.subheadline)
                Image(systemName: "arrow.right")
                    .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
                Text(context.state.nextStation)
                    .font(.subheadline).fontWeight(.bold)
                    .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
                Spacer()
                if context.state.delayMinutes > 0 {
                    Text("\(context.state.delayMinutes)分遅れ")
                        .font(.caption).fontWeight(.bold).foregroundColor(.red)
                } else {
                    Text("定刻")
                        .font(.caption).foregroundColor(.green)
                }
                Text("着 \(context.state.scheduledArrival)")
                    .font(.caption).foregroundColor(.secondary)
            }
        }
        .padding(12)
    }
}

// MARK: Widget

struct TrainFollowLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: TrainFollowAttributes.self) { context in
            TrainFollowBannerView(context: context)
                .activityBackgroundTint(Color(.systemBackground))
        } dynamicIsland: { context in
            DynamicIsland {
                DynamicIslandExpandedRegion(.leading) {
                    Label(context.attributes.trainNumber, systemImage: "tram.fill")
                        .font(.caption).fontWeight(.semibold)
                        .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
                }
                DynamicIslandExpandedRegion(.trailing) {
                    if context.state.delayMinutes > 0 {
                        Text("\(context.state.delayMinutes)分遅れ")
                            .font(.caption).fontWeight(.bold).foregroundColor(.red)
                    } else {
                        Text("定刻")
                            .font(.caption).foregroundColor(.green)
                    }
                }
                DynamicIslandExpandedRegion(.center) {
                    Text("\(context.state.currentStation) → \(context.state.nextStation)")
                        .font(.caption)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    HStack {
                        Text(context.attributes.lineName)
                            .font(.caption2).foregroundColor(.secondary)
                        Spacer()
                        Text(context.attributes.destination + " 着 \(context.state.scheduledArrival)")
                            .font(.caption2).foregroundColor(.secondary)
                    }
                    .padding(.horizontal, 8)
                }
            } compactLeading: {
                Label(context.attributes.trainNumber, systemImage: "tram.fill")
                    .font(.caption2).fontWeight(.semibold)
                    .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
            } compactTrailing: {
                Text(context.state.nextStation)
                    .font(.caption2).lineLimit(1)
            } minimal: {
                Image(systemName: "tram.fill")
                    .foregroundColor(Color(red: 0, green: 0.6, blue: 0.8))
            }
            .keylineTint(Color(red: 0, green: 0.6, blue: 0.8))
        }
    }
}