//
//  AlarmLiveActivityWidget.swift
//  TheNoiseClockWidget
//
//  Created by Matt Bruce on 2/2/26.
//

import AlarmKit
import SwiftUI
import WidgetKit

/// Live Activity widget for alarm countdown and alerting states.
/// Uses AlarmKit's AlarmAttributes for automatic countdown management.
struct AlarmLiveActivityWidget: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: AlarmAttributes<NoiseClockAlarmMetadata>.self) { context in
            // Lock Screen presentation
            LockScreenAlarmView(
                attributes: context.attributes,
                state: context.state
            )
        } dynamicIsland: { context in
            DynamicIsland {
                // Expanded regions
                DynamicIslandExpandedRegion(.leading) {
                    if let metadata = context.attributes.metadata {
                        AlarmTitleView(metadata: metadata)
                    } else {
                        Text("Alarm")
                            .font(.caption)
                    }
                }
                DynamicIslandExpandedRegion(.trailing) {
                    AlarmProgressView(state: context.state)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    ExpandedAlarmView(
                        attributes: context.attributes,
                        state: context.state
                    )
                }
            } compactLeading: {
                // Compact leading - countdown text
                CountdownTextView(state: context.state)
                    .foregroundStyle(context.attributes.tintColor)
            } compactTrailing: {
                // Compact trailing - progress ring
                AlarmProgressView(state: context.state)
                    .frame(maxWidth: 32)
            } minimal: {
                // Minimal - just an alarm icon
                Image(systemName: "alarm.fill")
                    .foregroundStyle(context.attributes.tintColor)
            }
        }
    }
}

// MARK: - Lock Screen View

struct LockScreenAlarmView: View {
    let attributes: AlarmAttributes<NoiseClockAlarmMetadata>
    let state: AlarmPresentationState
    
    private var alarmLabel: String {
        attributes.metadata?.label ?? "Alarm"
    }
    
    var body: some View {
        VStack(spacing: 12) {
            // Alarm label
            Text(alarmLabel)
                .font(.headline)
                .foregroundStyle(.primary)
            
            // Countdown state
            if case .countdown(let countdown) = state.mode {
                VStack(spacing: 4) {
                    Text("Alarm in")
                        .font(.caption)
                        .foregroundStyle(.secondary)
                    Text(timerInterval: Date.now...countdown.fireDate, countsDown: true)
                        .font(.system(size: 48, weight: .bold, design: .rounded))
                        .monospacedDigit()
                        .foregroundStyle(attributes.tintColor)
                }
            } else if case .paused = state.mode {
                Text("Paused")
                    .font(.title3)
                    .foregroundStyle(.secondary)
            } else {
                // Other states (alerting, etc.)
                VStack(spacing: 4) {
                    Image(systemName: "alarm.waves.left.and.right.fill")
                        .font(.system(size: 32))
                        .foregroundStyle(attributes.tintColor)
                        .symbolEffect(.pulse)
                    Text("Alarm Ringing")
                        .font(.title3.weight(.semibold))
                }
            }
        }
        .padding()
        .frame(maxWidth: .infinity)
    }
}

// MARK: - Expanded Dynamic Island View

struct ExpandedAlarmView: View {
    let attributes: AlarmAttributes<NoiseClockAlarmMetadata>
    let state: AlarmPresentationState
    
    var body: some View {
        HStack {
            CountdownTextView(state: state)
                .font(.headline)
            
            Spacer()
            
            AlarmProgressView(state: state)
                .frame(maxHeight: 30)
        }
    }
}

// MARK: - Countdown Text View

struct CountdownTextView: View {
    let state: AlarmPresentationState
    
    var body: some View {
        if case .countdown(let countdown) = state.mode {
            Text(timerInterval: Date.now...countdown.fireDate, countsDown: true)
                .monospacedDigit()
                .lineLimit(1)
        } else if case .paused = state.mode {
            Text("Paused")
        } else {
            Text("Now!")
                .fontWeight(.bold)
        }
    }
}

// MARK: - Progress View

struct AlarmProgressView: View {
    let state: AlarmPresentationState
    
    var body: some View {
        if case .countdown(let countdown) = state.mode {
            ProgressView(
                timerInterval: Date.now...countdown.fireDate,
                label: { EmptyView() },
                currentValueLabel: { Text("") }
            )
            .progressViewStyle(.circular)
        } else if case .paused = state.mode {
            Image(systemName: "pause.fill")
        } else {
            Image(systemName: "alarm.waves.left.and.right.fill")
                .symbolEffect(.pulse)
        }
    }
}

// MARK: - Title View

struct AlarmTitleView: View {
    let metadata: NoiseClockAlarmMetadata
    
    var body: some View {
        Text(metadata.label)
            .font(.caption)
            .lineLimit(1)
    }
}