//
//  LemonLimeWidgetLiveActivity.swift
//  LemonLimeWidget
//
//  Created by 송예찬 on 6/18/26.
//

import ActivityKit
import WidgetKit
import SwiftUI

private let timerEndDate = Date.distantFuture

struct LemonLimeWidgetLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: TimerActivityAttributes.self) { context in
            // MARK: Lock Screen / Banner
            HStack(spacing: 14) {
                Image(systemName: "timer")
                    .font(.title2.weight(.semibold))
                    .foregroundStyle(.yellow)

                VStack(alignment: .leading, spacing: 3) {
                    Text(context.attributes.taskName)
                        .font(.subheadline.weight(.semibold))
                        .foregroundStyle(.white)
                        .lineLimit(1)

                    Text(timerInterval: context.state.startDate...timerEndDate, countsDown: false)
                        .font(.caption.monospacedDigit())
                        .foregroundStyle(.yellow)
                }

                Spacer()

                Text(context.attributes.taskIcon)
                    .font(.largeTitle)
            }
            .padding(.horizontal, 16)
            .padding(.vertical, 12)
            .activityBackgroundTint(Color(red: 0.08, green: 0.30, blue: 0.08))
            .activitySystemActionForegroundColor(.yellow)

        } dynamicIsland: { context in
            DynamicIsland {
                // MARK: Expanded – top row
                DynamicIslandExpandedRegion(.leading) {
                    Label {
                        Text(context.attributes.taskName)
                            .font(.caption.weight(.semibold))
                            .lineLimit(1)
                    } icon: {
                        Text(context.attributes.taskIcon)
                            .font(.caption)
                    }
                    .foregroundStyle(.green)
                }

                DynamicIslandExpandedRegion(.trailing) {
                    Image(systemName: "circle.fill")
                        .font(.caption)
                        .foregroundStyle(.green)
                        .padding(.trailing, 4)
                }

                // MARK: Expanded – center (large timer)
                DynamicIslandExpandedRegion(.bottom) {
                    Text(timerInterval: context.state.startDate...timerEndDate, countsDown: false)
                        .font(.system(size: 44, weight: .bold, design: .monospaced))
                        .foregroundStyle(.yellow)
                        .frame(maxWidth: .infinity, alignment: .center)
                        .padding(.top, 4)
                }

            } compactLeading: {
                Image(systemName: "timer")
                    .foregroundStyle(.green)
                    .font(.caption.weight(.semibold))

            } compactTrailing: {
                Text(timerInterval: context.state.startDate...timerEndDate, countsDown: false)
                    .monospacedDigit()
                    .font(.caption2.weight(.medium))
                    .foregroundStyle(.yellow)
                    .frame(maxWidth: 52)

            } minimal: {
                ZStack {
                    Circle()
                        .fill(LinearGradient(
                            colors: [.green, Color(red: 0.8, green: 0.9, blue: 0.0)],
                            startPoint: .topLeading,
                            endPoint: .bottomTrailing
                        ))
                    Text(context.attributes.taskIcon)
                        .font(.system(size: 11))
                }
            }
            .keylineTint(.green)
        }
    }
}

// MARK: - Previews

extension TimerActivityAttributes {
    fileprivate static var preview: TimerActivityAttributes {
        TimerActivityAttributes(taskName: "운동하기", taskIcon: "🏃")
    }
}

extension TimerActivityAttributes.ContentState {
    fileprivate static var running: TimerActivityAttributes.ContentState {
        TimerActivityAttributes.ContentState(
            startDate: Date().addingTimeInterval(-125),
            elapsedSeconds: 125
        )
    }
}

#Preview("Notification", as: .content, using: TimerActivityAttributes.preview) {
    LemonLimeWidgetLiveActivity()
} contentStates: {
    TimerActivityAttributes.ContentState.running
}