import * as RN from 'react-native'

type SimpleEvents = 'tts-start' | 'tts-finish' | 'tts-error' | 'tts-cancel'
type SimpleEvent = {
  utteranceId: string | number
}

type ProgressEventName = 'tts-progress'
type ProgressEvent = {
  utteranceId: string | number
  location: number
  length: number
}

export type TtsEvents = SimpleEvents | ProgressEventName
export type TtsEvent<T extends TtsEvents = TtsEvents> = T extends ProgressEventName ? ProgressEvent : SimpleEvent
export type TtsEventHandler<T extends TtsEvents= TtsEvents> = (event: TtsEvent<T>) => any

export type TtsError = {
  code: 'no_engine' | 'error' | 'not_ready' | 'invalid_request' | 'network_error' | 'network_timeout' | 'not_installed_yet' | 'output_error'
  | 'service_error' | 'synthesis_error' | 'lang_missing_data' | 'lang_not_supported' | 'Android AudioManager error' | 'not_available' | 'not_found'
  | 'bad_rate'
  message: string
}

export type Voice = {
  id: string
  name: string
  language: string
  quality: number
  latency: number
  networkConnectionRequired: boolean
  notInstalled: boolean
}

export type Engine = {
  name: string
  label: string
  default: boolean
  icon: number
}

export type AndroidOptions = {
  /** Parameter key to specify the audio stream type to be used when speaking text or playing back a file */
  KEY_PARAM_STREAM: 'STREAM_VOICE_CALL' | 'STREAM_SYSTEM' | 'STREAM_RING' | 'STREAM_MUSIC' | 'STREAM_MUSIC' | 'STREAM_ALARM' | 'STREAM_NOTIFICATION' | 'STREAM_DTMF' | 'STREAM_ACCESSIBILITY'
  /** Parameter key to specify the speech volume relative to the current stream type volume used when speaking text. Volume is specified as a float ranging from 0 to 1 where 0 is silence, and 1 is the maximum volume (the default behavior). */
  KEY_PARAM_VOLUME: number
  /** Parameter key to specify how the speech is panned from left to right when speaking text. Pan is specified as a float ranging from -1 to +1 where -1 maps to a hard-left pan, 0 to center (the default behavior), and +1 to hard-right. */
  KEY_PARAM_PAN: number
}

export type Options = string | {
  iosVoiceId: string
  rate: number
  androidParams: AndroidOptions
}

export class ReactNativeTts extends RN.NativeEventEmitter {
  getInitStatus: () => Promise<'success'>
  requestInstallEngine: () => Promise<'success'>
  requestInstallData: () => Promise<'success'>
  setDucking: (enabled: boolean) => Promise<'success'>
  setDefaultEngine: (engineName: string) => Promise<boolean>
  setDefaultVoice: (voiceId: string) => Promise<'success'>
  setDefaultRate: (rate: number, skipTransform?: boolean) => Promise<'success'>
  setDefaultPitch: (pitch: number) => Promise<'success'>
  setDefaultLanguage: (language: string) => Promise<'success'>
  setIgnoreSilentSwitch: (ignoreSilentSwitch: boolean) => Promise<boolean>
  voices: () => Voice[]
  engines: () => Promise<Engine[]>
  /** Read the sentence and return an id for the task. */
  speak: (utterance: string, options?: Options) => string | number
  stop: (onWordBoundary?: boolean) => Promise<boolean>
  pause: (onWordBoundary?: boolean) => Promise<boolean>
  resume: () => Promise<boolean>
  addEventListener: <T extends TtsEvents>(type: T, handler: TtsEventHandler<T>) => void
  removeEventListener: <T extends TtsEvents>(type: T, handler: TtsEventHandler<T>) => void
}

declare const Tts = new ReactNativeTts();

export default Tts