"""TOML format converter."""

from pathlib import Path
from typing import Any, Dict

import tomlkit
from tomlkit import TOMLDocument

from config_converter.converters.base import BaseConverter, ConversionError


class TomlConverter(BaseConverter):
    """Converter for TOML configuration files."""

    FORMAT_NAME = "toml"
    FILE_EXTENSIONS = ["toml"]

    def read(self, source: str | Path) -> Dict[str, Any]:
        """Read and parse a TOML configuration file."""
        try:
            with open(source, "r", encoding="utf-8") as f:
                return tomlkit.parse(f.read())
        except tomlkit.exceptions.ParseError as e:
            raise ConversionError(f"Invalid TOML in {source}: {e}") from e
        except FileNotFoundError as e:
            raise ConversionError(f"File not found: {source}") from e
        except PermissionError as e:
            raise ConversionError(f"Permission denied: {source}") from e

    def write(self, data: Dict[str, Any], target: str | Path) -> None:
        """Write configuration data to a TOML file."""
        try:
            doc: TOMLDocument = tomlkit.document()
            for key, value in data.items():
                doc[key] = value
            with open(target, "w", encoding="utf-8") as f:
                f.write(tomlkit.dumps(doc))
        except (OSError, TypeError, tomlkit.exceptions.TypeError) as e:
            raise ConversionError(f"Failed to write TOML to {target}: {e}") from e

    def parse(self, content: str) -> Dict[str, Any]:
        """Parse TOML content from a string."""
        try:
            return tomlkit.parse(content)
        except tomlkit.exceptions.ParseError as e:
            raise ConversionError(f"Invalid TOML content: {e}") from e

    def format(self, data: Dict[str, Any]) -> str:
        """Format configuration data to a TOML string."""
        try:
            doc: TOMLDocument = tomlkit.document()
            for key, value in data.items():
                doc[key] = value
            return tomlkit.dumps(doc)
        except (TypeError, ValueError, tomlkit.exceptions.TypeError) as e:
            raise ConversionError(f"Failed to format data as TOML: {e}") from e