import SwiftUI

// The device panel's two §15.20 rows, apart from DevicePanel so the panel
// changes by a line each: what your microphone is sending, measured, and
// on a Mac with an audio interface, which of its inputs.

/// "Microphone level": the meter from your own tile, in the panel where a
/// person looks when they are told they cannot be heard — which, before
/// this, showed a microphone name and nothing measured at all.
public struct MicLevelRow: View {
  @ObservedObject var mic: MicAudio
  public init(mic: MicAudio) { self.mic = mic }
  public var body: some View {
    VStack(alignment: .leading, spacing: 4) {
      HStack(spacing: 8) {
        Text("Microphone level").font(.subheadline)
        // The tiles' glow is for a call; setting up wants to see the
        // level itself, so the panel keeps a compact meter, borderless.
        AudioLevelBars(step: mic.muted ? 0 : mic.step, height: 14)
        Text(words).font(.footnote).foregroundStyle(.secondary)
      }
      if mic.silent {
        Label(AudioWords.micSilent, systemImage: "exclamationmark.triangle.fill")
          .font(.callout).foregroundStyle(.orange)
          .fixedSize(horizontal: false, vertical: true)
          .accessibilityIdentifier("micSilent")
        Text(AudioWords.micSilentDetail(source: mic.source, channels: mic.channels))
          .font(.footnote).foregroundStyle(.secondary)
          .fixedSize(horizontal: false, vertical: true)
      }
    }
    .accessibilityElement(children: .combine)
    .accessibilityIdentifier("micLevel")
  }

  /// The meter in words, so it is never only a picture.
  private var words: String {
    if mic.muted { return "Muted" }
    if mic.silent { return "Silent" }
    return mic.step == 0 ? "Quiet" : mic.speaking ? "Hearing you" : "Picking up sound"
  }
}

#if os(macOS)
  /// "Input", for a microphone with more than one: an audio interface's
  /// inputs by number and, where the driver names them, by name. The call
  /// sends the chosen one, and the choice is remembered for the device.
  public struct InputChannelPicker: View {
    @ObservedObject var audio: AudioRoutes
    public init(audio: AudioRoutes) { self.audio = audio }
    public var body: some View {
      if audio.inputChannels.count > 1 {
        VStack(alignment: .leading, spacing: 4) {
          Picker(
            "Input",
            selection: Binding(
              get: { audio.inputChannel }, set: { audio.use(inputChannel: $0) })
          ) {
            ForEach(Array(audio.inputChannels.enumerated()), id: \.offset) { index, label in
              Text(label).tag(index)
            }
          }
          .pickerStyle(.menu)
          .accessibilityIdentifier("inputChannelPicker")
          Text(
            "This microphone has \(audio.inputChannels.count) inputs, and the call sends one. Choose the one your microphone is plugged into; changing it restarts the microphone for a moment."
          )
          .font(.footnote).foregroundStyle(.secondary)
          .fixedSize(horizontal: false, vertical: true)
        }
      }
    }
  }
#endif