export type Mora = {text: string, consonant?: string | undefined, consonant_length?: number | undefined, vowel: string, vowel_length: number, pitch: number};

export type AccentPhrase = {moras: Array<Mora>, accent: number, pause_mora?: Mora | undefined, is_interrogative?: boolean | undefined};

export type AudioQuery = {accent_phrases: Array<AccentPhrase>, speedScale: number, pitchScale: number, intonationScale: number, volumeScale: number, prePhonemeLength: number, postPhonemeLength: number, pauseLength?: (number | null) | undefined, pauseLengthScale?: number | undefined, outputSamplingRate: number, outputStereo: boolean, kana?: string | undefined};

export type CreateApiStreamingSynthesisArgs = {speaker: number, start_offset?: number | undefined, segment_length?: number | undefined, enable_interrogative_upspeak?: boolean | undefined, core_version?: string | undefined, body: AudioQuery};

export type CreateApiStreamingSynthesisOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

/**
 * ストリーミングで音声合成する
 * 
 * POST /streaming_synthesis
 */
export const createApiStreamingSynthesis = async (args: CreateApiStreamingSynthesisArgs, options: CreateApiStreamingSynthesisOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "audio/wav")

if (args.speaker != null) query.append("speaker", String(args.speaker))
if (args.start_offset != null) query.append("start_offset", String(args.start_offset))
if (args.segment_length != null) query.append("segment_length", String(args.segment_length))
if (args.enable_interrogative_upspeak != null) query.append("enable_interrogative_upspeak", String(args.enable_interrogative_upspeak))
if (args.core_version != null) query.append("core_version", String(args.core_version))

const url = `${baseUrl.replace(/\/+$/, '')}/streaming_synthesis${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return res.blob()
};