import requests
import logging

class GetBranchSHA:
    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_branch_sha.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, branch):
        url = f"{self.base_url}/repos/{self.repo}/git/refs/heads/{branch}"
        response = requests.get(url, headers=self.headers)
        if response.status_code == 200:
            return response.json()["object"]["sha"]
        else:
            return f"Error getting branch SHA: {response.status_code}"

# JSON definition for the get_branch_sha function
get_branch_sha_definition = {
    "name": "get_branch_sha",
    "description": "Get the SHA of the latest commit on a branch",
    "parameters": {
        "type": "object",
        "properties": {
            "branch": {
                "type": "string",
                "description": "Name of the branch"
            }
        },
        "required": ["branch"]
    }
}