sinProject-Inc/talk

import type { Speech } from '$lib/speech/speech'
import text_to_speech from '@google-cloud/text-to-speech'
import protos from '@google-cloud/text-to-speech/build/protos/protos'
import { SpeechSound } from './sound/speech_sound'
import type { SpeechText } from './speech_text'
import type { VoiceLocale } from './voice/voice_repository'

const { google } = protos

export class SpeechByGoogle implements Speech {
    public constructor(
        private readonly _speech_text: SpeechText,
        private readonly _voice_locale: VoiceLocale
    ) {}

    public async speak(): Promise<SpeechSound> {
        const text = this._speech_text.text
        const locale_code = this._voice_locale.locale.code
        const name = this._voice_locale.name

        const request = {
            input: { text },
            voice: { languageCode: locale_code, name },
            audioConfig: { audioEncoding: google.cloud.texttospeech.v1.AudioEncoding.MP3 },
        }

        const text_to_speech_client = new text_to_speech.TextToSpeechClient()
        const [response] = await text_to_speech_client.synthesizeSpeech(request)
        const uint8_array = response.audioContent as Uint8Array
        const speech_sound = new SpeechSound(uint8_array)

        return speech_sound
    }
}