"""MCP server for AI agent integration (V2).

Exposes MergeGuard analysis capabilities as MCP tools that
AI coding agents can use to check for conflicts before
opening PRs.

Planned for Phase 3 (Weeks 17-18).
"""

from __future__ import annotations


def create_mcp_server():
    """Create and configure the MCP server.

    Exposes the following tools:
    - check_conflicts: Check if a set of file changes would conflict with open PRs
    - get_risk_score: Get the risk score for a hypothetical PR
    - suggest_merge_order: Suggest optimal merge order for open PRs

    TODO: Implement in Phase 3 (Weeks 17-18).
    """
    try:
        from mcp.server import Server
    except ImportError:
        raise ImportError(
            "The 'mcp' package is required for MCP server functionality. "
            "Install it with: pip install mcp"
        )

    server = Server("mergeguard")

    @server.tool("check_conflicts")
    async def check_conflicts(
        repo: str,
        files: list[str],
        token: str,
    ) -> dict:
        """Check if modifying the given files would conflict with open PRs.

        Args:
            repo: Repository in "owner/repo" format.
            files: List of file paths that will be modified.
            token: GitHub token for API access.

        Returns:
            Dict with conflict analysis results.
        """
        # TODO: Implement
        return {
            "status": "not_implemented",
            "message": "MCP server is planned for Phase 3 (V2)",
        }

    @server.tool("get_risk_score")
    async def get_risk_score(
        repo: str,
        pr_number: int,
        token: str,
    ) -> dict:
        """Get the risk score for an open PR.

        Args:
            repo: Repository in "owner/repo" format.
            pr_number: PR number to analyze.
            token: GitHub token for API access.

        Returns:
            Dict with risk score and breakdown.
        """
        # TODO: Implement
        return {
            "status": "not_implemented",
            "message": "MCP server is planned for Phase 3 (V2)",
        }

    @server.tool("suggest_merge_order")
    async def suggest_merge_order(
        repo: str,
        token: str,
    ) -> dict:
        """Suggest the optimal merge order for all open PRs.

        Args:
            repo: Repository in "owner/repo" format.
            token: GitHub token for API access.

        Returns:
            Dict with suggested merge order and reasoning.
        """
        # TODO: Implement
        return {
            "status": "not_implemented",
            "message": "MCP server is planned for Phase 3 (V2)",
        }

    return server
