"""
GitHub operations module for cloud coder agents.
Handles commits, branches, and PR creation using GitHub CLI.
"""

import subprocess
from pathlib import Path
from typing import Optional


REPO_DIR = Path("/workspace/OpenSIN-Code")
if not REPO_DIR.exists():
    REPO_DIR = Path("/home/user/project/OpenSIN-Code")
    if not REPO_DIR.exists():
        REPO_DIR = Path.cwd().parent / "OpenSIN-Code"


class GitHubOps:
    """Handles all GitHub-related operations."""

    def __init__(self, repo_dir: Optional[Path] = None):
        self.repo_dir = repo_dir or REPO_DIR

    def _run_git(self, args: list[str], capture: bool = True) -> subprocess.CompletedProcess:
        """Run a git command in the repository."""
        cmd = ["git"] + args
        return subprocess.run(
            cmd, cwd=str(self.repo_dir), capture_output=capture, text=True, check=False
        )

    def _run_gh(self, args: list[str], capture: bool = True) -> subprocess.CompletedProcess:
        """Run a gh CLI command."""
        cmd = ["gh"] + args
        return subprocess.run(cmd, capture_output=capture, text=True, check=False)

    def ensure_branch(self, branch_name: str, base: str = "main") -> bool:
        """Ensure branch exists, create from base if not."""
        # Check if branch exists locally
        result = self._run_git(["branch", "--list", branch_name])
        if branch_name in result.stdout:
            # Checkout existing branch
            checkout = self._run_git(["checkout", branch_name])
            return checkout.returncode == 0

        # Create new branch from base
        checkout = self._run_git(["checkout", base])
        if checkout.returncode != 0:
            return False

        pull = self._run_git(["pull", "origin", base])
        if pull.returncode != 0:
            return False

        create = self._run_git(["checkout", "-b", branch_name])
        return create.returncode == 0

    def commit_changes(self, message: str) -> Optional[str]:
        """Stage and commit all changes."""
        # Add all changes
        add = self._run_git(["add", "."])
        if add.returncode != 0:
            raise RuntimeError(f"git add failed: {add.stderr}")

        # Commit
        commit = self._run_git(["commit", "-m", message])
        if commit.returncode != 0:
            if "nothing to commit" in commit.stderr.lower():
                return None
            raise RuntimeError(f"git commit failed: {commit.stderr}")

        # Get commit SHA
        sha = commit.stdout.strip().split()[-1] if commit.stdout else "unknown"
        return sha

    def push_branch(self, branch_name: str, force: bool = False) -> bool:
        """Push branch to origin."""
        args = ["push", "origin", branch_name]
        if force:
            args.append("--force")
        push = self._run_git(args)
        return push.returncode == 0

    def create_pr(
        self, title: str, body: str, base: str = "main", head: str = None
    ) -> Optional[str]:
        """Create a pull request using gh CLI."""
        if not head:
            # Get current branch
            branch_result = self._run_git(["branch", "--show-current"])
            head = branch_result.stdout.strip()

        args = ["pr", "create", "--title", title, "--body", body, "--base", base, "--head", head]

        result = self._run_gh(args)
        if result.returncode == 0:
            # Extract PR URL from output
            lines = result.stdout.strip().split("\n")
            for line in lines:
                if "https://github.com" in line:
                    return line.strip()
            return result.stdout
        else:
            if "already exists" in result.stderr.lower():
                # PR already exists, return existing URL
                list_result = self._run_gh(
                    ["pr", "list", "--head", head, "--json", "url", "--jq", ".[0].url"]
                )
                if list_result.returncode == 0 and list_result.stdout.strip():
                    return list_result.stdout.strip()
            return None

    def get_issue(self, issue_number: int) -> Optional[dict]:
        """Fetch issue details using gh CLI."""
        result = self._run_gh(
            ["issue", "view", str(issue_number), "--json", "number,title,body,labels,state"]
        )

        if result.returncode == 0:
            try:
                return json.loads(result.stdout)
            except json.JSONDecodeError:
                return None
        return None

    def get_current_branch(self) -> str:
        """Get current branch name."""
        result = self._run_git(["branch", "--show-current"])
        return result.stdout.strip() if result.returncode == 0 else "main"

    def branch_exists_on_remote(self, branch_name: str) -> bool:
        """Check if branch exists on remote."""
        result = self._run_git(["ls-remote", "--heads", "origin", branch_name])
        return result.returncode == 0 and bool(result.stdout.strip())

    def rebase_main(self) -> bool:
        """Rebase current branch on main."""
        current = self.get_current_branch()
        if current == "main":
            return True

        # Fetch latest
        fetch = self._run_git(["fetch", "origin", "main"])
        if fetch.returncode != 0:
            return False

        # Rebase
        rebase = self._run_git(["rebase", "origin/main"])
        return rebase.returncode == 0