import AppIntents
import Commanding
import Recording
import SwiftUI
import WidgetKit

/// The buttons controlling the recording flow through the App Intents the app executes, matching the current state: a pause
/// button while recording; discard, resume, and send buttons while paused; and only a discard button while the recorded input
/// is being processed.
struct RecordingControls: View {
    
    // MARK: Properties
    
    /// The dynamic content of the Live Activity to render.
    let state: RecordingActivityAttributes.ContentState
    
    // MARK: Body
    
    var body: some View {
        HStack(
            spacing: Constant.Spacing.stack
        ) {
            switch state.state {
            case .recording:
                Button(intent: ToggleRecordingIntent()) {
                    Image.Symbol.pause
                        .resizable()
                }
                .buttonStyle(.action(
                    type: .default
                ))

            case .paused:
                Button(intent: DiscardRecordingIntent()) {
                    Image.Symbol.discard
                        .resizable()
                }
                .buttonStyle(.action(
                    type: .destructive
                ))

                Button(intent: ToggleRecordingIntent()) {
                    Image.Symbol.microphone
                        .resizable()
                }
                .buttonStyle(.action(
                    type: .default
                ))
                
                Button(intent: ProcessRecordingIntent()) {
                    Image.Symbol.send
                        .resizable()
                }
                .buttonStyle(.action(
                    type: .confirmative
                ))

            case .processing:
                Button(intent: DiscardRecordingIntent()) {
                    Image.Symbol.discard
                        .resizable()
                }
                .buttonStyle(.action(
                    type: .destructive
                ))
            }
        }
        .buttonStyle(.borderedProminent)
    }
    
}

// MARK: - Constants

/// The constant values used across the recording Live Activity.
private enum Constant {
    /// The spacing constants.
    enum Spacing {
        /// The spacing between the elements of a stack.
        static let stack: CGFloat = 16
    }
}

// MARK: - Previews

#Preview(
    "Recording Controls view",
    as: .content,
    using: RecordingActivityAttributes()
) {
    RecordingLiveActivity()
} contentStates: {
    RecordingActivityAttributes.ContentState(
        state: .recording,
        anchor: .now,
        elapsed: 0
    )
    RecordingActivityAttributes.ContentState(
        state: .paused,
        anchor: nil,
        elapsed: 42
    )
    RecordingActivityAttributes.ContentState(
        state: .processing,
        anchor: nil,
        elapsed: 42
    )
}