"""Authentication and configuration management for Gitea MCP server."""

import os
from typing import Optional
from dotenv import load_dotenv


class AuthConfig:
    """Manages authentication configuration for Gitea API."""

    def __init__(self):
        """Initialize authentication configuration from environment variables."""
        load_dotenv()

        self.api_url: Optional[str] = os.getenv("GITEA_API_URL")
        self.api_token: Optional[str] = os.getenv("GITEA_API_TOKEN")

        self._validate()

    def _validate(self) -> None:
        """Validate that required configuration is present.

        Raises:
            ValueError: If required environment variables are missing.
        """
        if not self.api_url:
            raise ValueError(
                "GITEA_API_URL environment variable is required. "
                "Please set it in your .env file or environment."
            )

        if not self.api_token:
            raise ValueError(
                "GITEA_API_TOKEN environment variable is required. "
                "Please set it in your .env file or environment."
            )

        # Remove trailing slash from URL if present
        if self.api_url.endswith("/"):
            self.api_url = self.api_url[:-1]

    def get_auth_headers(self) -> dict[str, str]:
        """Get authentication headers for API requests.

        Returns:
            dict: HTTP headers with authorization token.
        """
        return {
            "Authorization": f"token {self.api_token}",
            "Content-Type": "application/json",
        }