"""get_critical_path MCP tool implementation."""

from xer_mcp.db.queries import query_critical_path
from xer_mcp.server import is_file_loaded


async def get_critical_path() -> dict:
    """Get all activities on the critical path.

    Returns activities where driving_path_flag is set, ordered by target start date.
    The critical path determines the minimum project duration.

    Returns:
        Dictionary with list of critical path activities, each containing:
        - task_id: Activity ID
        - task_code: Activity code
        - task_name: Activity name
        - task_type: Activity type (TT_Task, TT_Mile, etc.)
        - target_start_date: Target start date
        - target_end_date: Target end date
        - total_float_hr_cnt: Total float in hours
        - status_code: Activity status
    """
    if not is_file_loaded():
        return {
            "error": {
                "code": "NO_FILE_LOADED",
                "message": "No XER file is loaded. Use the load_xer tool first.",
            }
        }

    critical_activities = query_critical_path()

    return {
        "critical_activities": critical_activities,
    }