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"""
Contains Codecs for Python Avro.

Note that the word "codecs" means "compression/decompression algorithms" in the
Avro world (https://avro.apache.org/docs/current/spec.html#Object+Container+Files),
so don't confuse it with the Python's "codecs", which is a package mainly for
converting character sets (https://docs.python.org/3/library/codecs.html).
"""

from __future__ import annotations

from typing import Dict, Literal, Optional, Type

from typing_extensions import TypeAlias

from pyiceberg.avro.codecs.bzip2 import BZip2Codec
from pyiceberg.avro.codecs.codec import Codec
from pyiceberg.avro.codecs.deflate import DeflateCodec
from pyiceberg.avro.codecs.snappy_codec import SnappyCodec
from pyiceberg.avro.codecs.zstandard_codec import ZStandardCodec

AvroCompressionCodec: TypeAlias = Literal["null", "bzip2", "snappy", "zstandard", "deflate"]

AVRO_CODEC_KEY = "avro.codec"

KNOWN_CODECS: Dict[AvroCompressionCodec, Optional[Type[Codec]]] = {
    "null": None,
    "bzip2": BZip2Codec,
    "snappy": SnappyCodec,
    "zstandard": ZStandardCodec,
    "deflate": DeflateCodec,
}

# Map to convert the naming from Iceberg to Avro
CODEC_MAPPING_ICEBERG_TO_AVRO: Dict[str, str] = {"gzip": "deflate", "zstd": "zstandard"}