import Foundation
import Combine

/// Protocol abstracting audio recording capabilities.
/// Allows swapping between Mock and Real (AVAudioEngine) implementations.
protocol AudioRecorderProtocol: ObservableObject {
    /// Current recording state
    var isRecording: Bool { get }
    /// Elapsed recording time in seconds
    var elapsedTime: TimeInterval { get }
    /// Current amplitude level (0.0 - 1.0) for waveform visualization
    var currentAmplitude: Float { get }
    /// Rolling buffer of recent amplitude samples for waveform drawing
    var waveformSamples: [Float] { get }
    /// The local file URL of the current/last recording. nil for mock.
    var outputFileURL: URL? { get }
    /// Whether the active recording is paused
    var isPaused: Bool { get }
    
    func startRecording()
    func stopRecording()
    func pauseRecording()
    func resumeRecording()
}