import audioContextInstance from '../audio-context'

export function float32ToMonoAudioBuffer(
  float32Data: Float32Array,
  sampleRate: number = audioContextInstance.sampleRate
): AudioBuffer {
  const finalBuffer = audioContextInstance.createBuffer(
    1,
    float32Data.length,
    sampleRate
  )

  finalBuffer.copyToChannel(float32Data, 0, 0)
  return finalBuffer
}

export function decodeAudioData(
  arrayBuffer: ArrayBuffer
): Promise<AudioBuffer> {
  return new Promise((resolve, reject) => {
    audioContextInstance.decodeAudioData(
      arrayBuffer,
      (buffer: AudioBuffer) => resolve(buffer),
      (error: any) => reject(error)
    )
  })
}

export function exportBlobAsBase64(blob: Blob): Promise<string> {
  return new Promise((resolve, reject) => {
    const fileReader = new FileReader()
    fileReader.onloadend = () => {
      const result = fileReader.result as string
      if (result) {
        resolve(result)
      } else {
        reject('Could not convert blob to base 64 string.')
      }
    }
    fileReader.readAsDataURL(blob)
  })
}