"""Field constants."""

# service fields
INPUT = "input"
OUTPUT = "output"
TRANSCODING = "transcoding"
BUCKET = "bucket"
KEY = "key"

# transcoding properties fields
CONTAINER = "container"
CHANNELS = "channels"
CODEC = "codec"
SAMPLE_RATE = "sample_rate"
BIT_RATE = "bit_rate"
BIT_DEPTH = "bit_depth"
STATUS_TOPIC_ALIAS = "status_topic_alias"
DURATION = "duration"
METADATA = "metadata"

# transcoding response fields
SNS_TOPIC = "sns_topic"

# transcoding job status fields
STATUS = "status"
STATUS_DESCRIPTION = "status_description"

# available codec names
ALAC_CODEC_NAME = "alac"
FLAC_CODEC_NAME = "flac"
PCM_CODEC_NAME = "pcm"
MP3_CODEC_NAME = "mpa1l3"

ALLOWED_CODECS = [ALAC_CODEC_NAME, FLAC_CODEC_NAME, PCM_CODEC_NAME, MP3_CODEC_NAME]

# available container names
FLAC_CONTAINER_NAME = "flac"
WAVE_CONTAINER_NAME = "wave"
MPEG4_CONTAINER_NAME = "mpeg-4"
MPEG_CONTAINER_NAME = "mpeg audio"

# available extension names
EXTENSION_MAPPING = {
    FLAC_CONTAINER_NAME: "flac",
    WAVE_CONTAINER_NAME: "wav",
    MPEG4_CONTAINER_NAME: "m4a",
    MPEG_CONTAINER_NAME: "mp3",
}

CODEC_MAPPING = {
    FLAC_CONTAINER_NAME: [FLAC_CODEC_NAME],
    WAVE_CONTAINER_NAME: [PCM_CODEC_NAME],
    MPEG4_CONTAINER_NAME: [ALAC_CODEC_NAME],
    MPEG_CONTAINER_NAME: [MP3_CODEC_NAME],
}

ALLOWED_CONTAINERS = list(EXTENSION_MAPPING.keys())

ALLOWED_BIT_SAMPLE_RATE = {
    16: [44100, 48000],
    24: [44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000],
}

STEREO_CHANNELS_COUNT = 2
MONO_CHANNELS_COUNT = 1