import ActivityKit
import WidgetKit
import SwiftUI

@available(iOS 16.1, *)
struct TaskLiveActivity: Widget {
    private let accent = WidgetTheme.accent // brand orange

    var body: some WidgetConfiguration {
        ActivityConfiguration(for: TaskActivityAttributes.self) { context in
            // ── Lock screen / banner ──
            HStack(spacing: 12) {
                Image(systemName: context.state.isComplete ? "checkmark.circle.fill" : "circle")
                    .font(.system(size: 22))
                    .foregroundColor(context.state.isComplete ? .green : accent)
                VStack(alignment: .leading, spacing: 2) {
                    Text(context.attributes.title)
                        .font(.system(size: 15, weight: .semibold))
                        .foregroundColor(.white)
                        .lineLimit(1)
                        .strikethrough(context.state.isComplete)
                    if let due = context.state.dueDate {
                        Text(due, style: context.state.isComplete ? .date : .relative)
                            .font(.system(size: 12, design: .monospaced))
                            .foregroundColor(.white.opacity(0.6))
                    }
                }
                Spacer()
                if let due = context.state.dueDate, !context.state.isComplete {
                    Text(due, style: .timer)
                        .font(.system(size: 16, weight: .bold, design: .monospaced))
                        .foregroundColor(accent)
                        .frame(maxWidth: 70)
                }
            }
            .padding(.horizontal, 16)
            .padding(.vertical, 12)
            .activityBackgroundTint(WidgetTheme.background.opacity(0.9))
            .activitySystemActionForegroundColor(.white)

        } dynamicIsland: { context in
            DynamicIsland {
                DynamicIslandExpandedRegion(.leading) {
                    Image(systemName: "checklist")
                        .foregroundColor(accent)
                }
                DynamicIslandExpandedRegion(.trailing) {
                    if let due = context.state.dueDate, !context.state.isComplete {
                        Text(due, style: .timer)
                            .font(.system(.body, design: .monospaced))
                            .foregroundColor(accent)
                            .frame(maxWidth: 64)
                    }
                }
                DynamicIslandExpandedRegion(.center) {
                    Text(context.attributes.title)
                        .font(.system(size: 14, weight: .semibold))
                        .lineLimit(1)
                }
            } compactLeading: {
                Image(systemName: "checklist").foregroundColor(accent)
            } compactTrailing: {
                if let due = context.state.dueDate, !context.state.isComplete {
                    Text(due, style: .timer)
                        .font(.system(.caption2, design: .monospaced))
                        .foregroundColor(accent)
                        .frame(maxWidth: 44)
                }
            } minimal: {
                Image(systemName: "checklist").foregroundColor(accent)
            }
        }
    }
}