"""Rust dependency parser for Cargo.toml."""

from pathlib import Path
import tomllib

from . import BaseParser, Dependency


class RustDependencyParser(BaseParser):
    """Parser for Rust Cargo.toml files."""

    def can_parse(self, path: Path) -> bool:
        """Check if the file is a Cargo.toml."""
        return path.name.lower() == "cargo.toml"

    def parse(self, path: Path) -> list[Dependency]:
        """Parse dependencies from Cargo.toml."""
        if not path.exists():
            return []

        dependencies = []
        try:
            with open(path, "rb") as f:
                data = tomllib.load(f)
        except (tomllib.TOMLDecodeError, OSError):
            return dependencies

        self._parse_dependencies_section(data, "dependencies", dependencies, path)
        self._parse_dependencies_section(data, "dev-dependencies", dependencies, path, is_dev=True)
        self._parse_dependencies_section(data, "build-dependencies", dependencies, path, is_dev=True)

        return dependencies

    def _parse_dependencies_section(
        self,
        data: dict,
        section: str,
        dependencies: list,
        source_file: Path,
        is_dev: bool = False,
    ) -> None:
        """Parse a specific dependencies section."""
        if section in data:
            section_data = data[section]
            if isinstance(section_data, dict):
                for name, value in section_data.items():
                    if isinstance(value, str):
                        version = value
                    elif isinstance(value, dict):
                        version = value.get("version", None)
                        features = value.get("features", [])
                        if features:
                            pass
                    else:
                        version = None

                    dependencies.append(
                        Dependency(
                            name=name,
                            version=self._normalize_version(version),
                            is_dev=is_dev,
                            source_file=source_file,
                        )
                    )