# tools/github_tool.py
from .base_tool import BaseTool
import requests
import os

class GitHubTool(BaseTool):
    def __init__(self):
        self.base_url = "https://api.github.com"
        self.token = os.environ.get("GITHUB_TOKEN")
        self.headers = {
            "Authorization": f"token {self.token}",
            "Accept": "application/vnd.github.v3+json"
        }
        self.repo = os.environ.get("GITHUB_REPOSITORY")

    def get_functions(self):
        return [
            {
                "name": "read_file",
                "description": "Read a file from the repository",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "path": {
                            "type": "string",
                            "description": "Path to the file in the repository"
                        }
                    },
                    "required": ["path"]
                }
            },
            {
                "name": "create_branch",
                "description": "Create a new branch in the repository",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "branch_name": {
                            "type": "string",
                            "description": "Name of the new branch"
                        },
                        "base_branch": {
                            "type": "string",
                            "description": "Name of the base branch",
                            "default": "main"
                        }
                    },
                    "required": ["branch_name"]
                }
            },
            {
                "name": "commit_file",
                "description": "Commit a file to a branch (not main)",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "branch_name": {
                            "type": "string",
                            "description": "Name of the branch to commit to"
                        },
                        "file_path": {
                            "type": "string",
                            "description": "Path to the file in the repository"
                        },
                        "content": {
                            "type": "string",
                            "description": "Content of the file"
                        },
                        "commit_message": {
                            "type": "string",
                            "description": "Commit message"
                        }
                    },
                    "required": ["branch_name", "file_path", "content", "commit_message"]
                }
            },
            {
                "name": "create_pull_request",
                "description": "Create a pull request",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "title": {
                            "type": "string",
                            "description": "Title of the pull request"
                        },
                        "body": {
                            "type": "string",
                            "description": "Body of the pull request"
                        },
                        "head": {
                            "type": "string",
                            "description": "The name of the branch where your changes are implemented"
                        },
                        "base": {
                            "type": "string",
                            "description": "The name of the branch you want the changes pulled into",
                            "default": "main"
                        }
                    },
                    "required": ["title", "body", "head"]
                }
            }
        ]

    def execute(self, function_name, **kwargs):
        if function_name == "read_file":
            return self._read_file(kwargs["path"])
        elif function_name == "create_branch":
            return self._create_branch(kwargs["branch_name"], kwargs.get("base_branch", "main"))
        elif function_name == "commit_file":
            return self._commit_file(kwargs["branch_name"], kwargs["file_path"], kwargs["content"], kwargs["commit_message"])
        elif function_name == "push_branch":
            return self._push_branch(kwargs["branch_name"])
        elif function_name == "create_pull_request":
            return self._create_pull_request(kwargs["title"], kwargs["body"], kwargs["head"], kwargs.get("base", "main"))
        else:
            return f"Unknown function: {function_name}"


    def _read_file(self, path):
        url = f"{self.base_url}/repos/{self.repo}/contents/{path}"
        response = requests.get(url, headers=self.headers)
        if response.status_code == 200:
            content = response.json()["content"]
            return content
        else:
            return f"Error reading file: {response.status_code}"

    def _create_branch(self, branch_name, base_branch):
        url = f"{self.base_url}/repos/{self.repo}/git/refs"
        response = requests.get(f"{url}/heads/{base_branch}", headers=self.headers)
        if response.status_code != 200:
            return f"Error getting base branch: {response.status_code}"
        
        sha = response.json()["object"]["sha"]
        data = {
            "ref": f"refs/heads/{branch_name}",
            "sha": sha
        }
        response = requests.post(url, headers=self.headers, json=data)
        if response.status_code == 201:
            return f"Branch '{branch_name}' created successfully"
        else:
            return f"Error creating branch: {response.status_code}"

    def _commit_file(self, branch_name, file_path, content, commit_message):
        if branch_name == "main":
            return "Cannot commit directly to main branch"
        
        url = f"{self.base_url}/repos/{self.repo}/contents/{file_path}"
        data = {
            "message": commit_message,
            "content": content,
            "branch": branch_name
        }
        response = requests.put(url, headers=self.headers, json=data)
        if response.status_code in [200, 201]:
            return f"File committed successfully to branch '{branch_name}'"
        else:
            return f"Error committing file: {response.status_code}"

    def _create_pull_request(self, title, body, head, base):
        url = f"{self.base_url}/repos/{self.repo}/pulls"
        data = {
            "title": title,
            "body": body,
            "head": head,
            "base": base
        }
        response = requests.post(url, headers=self.headers, json=data)
        if response.status_code == 201:
            return f"Pull request created successfully: {response.json()['html_url']}"
        else:
            return f"Error creating pull request: {response.status_code}\nResponse: {response.text}"

    def _push_branch(self, branch_name):
        url = f"{self.base_url}/repos/{self.repo}/git/refs/heads/{branch_name}"
        response = requests.get(url, headers=self.headers)
        if response.status_code != 200:
            return f"Error getting branch information: {response.status_code}"
        
        sha = response.json()["object"]["sha"]
        
        push_url = f"{self.base_url}/repos/{self.repo}/git/refs/heads/{branch_name}"
        data = {
            "sha": sha,
            "force": True
        }
        response = requests.patch(push_url, headers=self.headers, json=data)
        if response.status_code == 200:
            return f"Branch '{branch_name}' pushed successfully"
        else:
            return f"Error pushing branch: {response.status_code}\nResponse: {response.text}"