"""
Company: eXonware.com
Author: eXonware Backend Team
Email: connect@exonware.com
Version: 0.9.0.6
Generation Date: November 2, 2025
FlatBuffers serialization - Memory-efficient serialization.
Following I→A→XW pattern:
- I: ISerialization (interface)
- A: ASerialization (abstract base)
- XW: FlatBuffersSerializer (concrete implementation)
"""

from typing import Any
from pathlib import Path
from exonware.xwsystem.io.serialization.base import ASerialization
from exonware.xwsystem.io.contracts import EncodeOptions, DecodeOptions
from exonware.xwsystem.io.defs import CodecCapability
from exonware.xwsystem.io.errors import SerializationError
import flatbuffers


class FlatBuffersSerializer(ASerialization):
    """
    FlatBuffers serializer - follows I→A→XW pattern.
    Uses flatbuffers library.
    """

    def __init__(self):
        """Initialize FlatBuffers serializer."""
        super().__init__()
    @property

    def codec_id(self) -> str:
        return "flatbuffers"
    @property

    def media_types(self) -> list[str]:
        return ["application/flatbuffers"]
    @property

    def file_extensions(self) -> list[str]:
        return [".fb", ".fbs"]
    @property

    def format_name(self) -> str:
        return "FlatBuffers"
    @property

    def mime_type(self) -> str:
        return "application/flatbuffers"
    @property

    def is_binary_format(self) -> bool:
        return True
    @property

    def supports_streaming(self) -> bool:
        return False
    @property

    def capabilities(self) -> CodecCapability:
        return CodecCapability.BIDIRECTIONAL | CodecCapability.SCHEMA_BASED
    @property

    def aliases(self) -> list[str]:
        return ["flatbuffers", "fb"]

    def encode(self, value: Any, *, options: EncodeOptions | None = None) -> bytes | str:
        """Encode FlatBuffers data to bytes."""
        try:
            # Requires builder instance
            if hasattr(value, 'Output'):
                return value.Output()
            raise TypeError("Value must be a FlatBuffers builder or have Output() method")
        except Exception as e:
            raise SerializationError(f"Failed to encode FlatBuffers: {e}", self.format_name, e)

    def decode(self, repr: bytes | str, *, options: DecodeOptions | None = None) -> Any:
        """Decode FlatBuffers bytes to data."""
        try:
            opts = options or {}
            root_type = opts.get('root_type')
            if root_type is None:
                raise ValueError("root_type required for FlatBuffers decoding")
            if isinstance(repr, str):
                repr = repr.encode('utf-8')
            return root_type.GetRootAs(repr, 0)
        except Exception as e:
            raise SerializationError(f"Failed to decode FlatBuffers: {e}", self.format_name, e)
FlatBuffersSerializer = FlatBuffersSerializer
