import base64
import requests
import logging

class GetFileAtCommit:
    def __init__(self, base_url, token, repo):
        self.base_url = base_url
        self.headers = {
            "Authorization": f"token {token}",
            "Accept": "application/vnd.github.v3+json"
        }
        self.repo = repo

        # Set up logging
        self.logger = logging.getLogger(__name__)
        self.logger.setLevel(logging.INFO)
        
        # Create a file handler
        file_handler = logging.FileHandler('get_file_at_commit.log')
        file_handler.setLevel(logging.INFO)
        
        # Create a console handler
        console_handler = logging.StreamHandler()
        console_handler.setLevel(logging.INFO)
        
        # Create a formatting for the logs
        formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
        file_handler.setFormatter(formatter)
        console_handler.setFormatter(formatter)
        
        # Add the handlers to the logger
        self.logger.addHandler(file_handler)
        self.logger.addHandler(console_handler)

    def __call__(self, file_path, commit_sha):
        self.logger.info(f"Getting file: {file_path} at commit: {commit_sha}")
        url = f"{self.base_url}/repos/{self.repo}/contents/{file_path}"
        response = requests.get(url, headers=self.headers, params={"ref": commit_sha})
        if response.status_code == 200:
            content = response.json()["content"]
            decoded_content = base64.b64decode(content).decode('utf-8')
            self.logger.info(f"Successfully retrieved file at commit")
            return decoded_content
        else:
            error_message = f"Error reading file at commit: {response.status_code}"
            self.logger.error(error_message)
            return error_message

# JSON definition for the get_file_at_commit function
get_file_at_commit_definition = {
    "name": "get_file_at_commit",
    "description": "Get the contents of a file at a specific commit",
    "parameters": {
        "type": "object",
        "properties": {
            "file_path": {
                "type": "string",
                "description": "Path to the file in the repository"
            },
            "commit_sha": {
                "type": "string",
                "description": "SHA of the commit to retrieve the file from"
            }
        },
        "required": ["file_path", "commit_sha"]
    }
}