import type { AuthorizationStatus } from "./types.js"
import { SpeechRecognitionTask } from "./SpeechRecognitionTask.js"

export class SpeechRecognizer {
  private endpoint: string
  private activeTask: SpeechRecognitionTask | null = null

  constructor(config?: { endpoint?: string }) {
    this.endpoint = config?.endpoint ?? "/api/transcribe"
  }

  static async requestAuthorization(): Promise<AuthorizationStatus> {
    try {
      const stream = await navigator.mediaDevices.getUserMedia({ audio: true })
      stream.getTracks().forEach((t) => t.stop())
      return "authorized"
    } catch (err: any) {
      if (err.name === "NotAllowedError") return "denied"
      if (err.name === "NotFoundError") return "restricted"
      return "denied"
    }
  }

  recognitionTask(): SpeechRecognitionTask {
    if (this.activeTask) {
      this.activeTask.cancel()
    }
    const task = new SpeechRecognitionTask(this.endpoint, () => {
      if (this.activeTask === task) this.activeTask = null
    })
    this.activeTask = task
    return task
  }

  get isAvailable(): boolean {
    return (
      typeof navigator !== "undefined" &&
      !!navigator.mediaDevices &&
      !!navigator.mediaDevices.getUserMedia
    )
  }
}