import { spawn } from "node:child_process";
import { BaseEngine, type VoiceParams } from "./BaseEngine.js";

export class EspeakEngine extends BaseEngine {
  constructor() {
    super("espeak", "ESpeak", "wav");
  }

  override getDefaultVoice(): string {
    return "en";
  }

  override validateVoice(_voice: string): boolean {
    return true;
  }

  override async getSpeechFile(
    text: string,
    filepath: string,
    voice: string = this.getDefaultVoice(),
    _params: VoiceParams = {},
  ): Promise<string> {
    return new Promise((resolve, reject) => {
      const proc = spawn("espeak", ["-v", voice, "-w", filepath, "--stdin"]);
      proc.on("error", reject);
      proc.on("close", (code) => {
        if (code === 0) resolve(filepath);
        else reject(new Error(`espeak exited with code ${code}`));
      });
      proc.stdin.end(text);
    });
  }
}