import SwiftUI
import WidgetKit

// A launcher complication: a static button on the watch face that opens the
// Workouts app. It carries no data, so the timeline is a single entry that
// never refreshes. Tapping any accessory widget launches its containing app,
// so no deep link or App Group is needed.

private struct LauncherEntry: TimelineEntry {
    let date: Date
}

private struct LauncherProvider: TimelineProvider {
    func placeholder(in context: Context) -> LauncherEntry {
        LauncherEntry(date: .now)
    }

    func getSnapshot(in context: Context, completion: @escaping (LauncherEntry) -> Void) {
        completion(LauncherEntry(date: .now))
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<LauncherEntry>) -> Void) {
        // Nothing ever changes — one entry, never reload.
        completion(Timeline(entries: [LauncherEntry(date: .now)], policy: .never))
    }
}

private struct LauncherView: View {
    @Environment(\.widgetFamily) private var family

    private let glyph = "dumbbell.fill"

    var body: some View {
        switch family {
        case .accessoryInline:
            Label("Workouts", systemImage: glyph)
        case .accessoryRectangular:
            Label("Workouts", systemImage: glyph)
                .font(.headline)
                .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
        case .accessoryCorner:
            Image(systemName: glyph)
                .font(.title2)
                .widgetLabel("Workouts")
        default: // .accessoryCircular and any future families
            ZStack {
                AccessoryWidgetBackground()
                Image(systemName: glyph)
                    .font(.title3)
            }
        }
    }
}

struct WorkoutsLauncherComplication: Widget {
    private let kind = "WorkoutsLauncher"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: LauncherProvider()) { _ in
            LauncherView()
                .containerBackground(.clear, for: .widget)
        }
        .configurationDisplayName("Open Workouts")
        .description("Tap to open the Workouts app.")
        .supportedFamilies([
            .accessoryCircular,
            .accessoryCorner,
            .accessoryInline,
            .accessoryRectangular,
        ])
    }
}

@main
struct WorkoutsWatchWidgetBundle: WidgetBundle {
    var body: some Widget {
        WorkoutsLauncherComplication()
    }
}