from __future__ import annotations

import os
from typing import Any

from fastmcp import FastMCP

from .auth import load_projects_config
from .config_api import (
    list_device_types as api_list_device_types,
    list_locations as api_list_locations,
    list_meter_types as api_list_meter_types,
    list_system_tree as api_list_system_tree,
    list_systems as api_list_systems,
    search_devices as api_search_devices,
    search_meters as api_search_meters,
)


mcp = FastMCP("instrument-config")


@mcp.tool(
    name="project.list",
    title="Project List",
    description="List enabled projects configured in sys_config for instrument-config tools. 在执行其他工具前，询问用户要查询哪一个项目，根据用户的选择查询对应项目。",
    tags={"project", "list"},
)
def project_list() -> dict[str, Any]:
    projects = load_projects_config()

    result: list[dict[str, Any]] = []
    for item in projects:
        if not item["enabled"]:
            continue
        result.append(
            {
                "project_key": item["project_key"],
                "project_name": item["project_name"],
            }
        )

    result.sort(key=lambda item: item["project_key"])
    return {
        "projects": result,
        "total": len(result),
    }


def _append_next_page_hint(payload: Any, page_num: int) -> Any:
    if not isinstance(payload, dict):
        return payload
    data = payload.get("data")
    if not isinstance(data, dict):
        return payload
    total_page = data.get("total_page")
    if isinstance(total_page, int) and total_page > page_num:
        payload.setdefault(
            "mcp_note",
            f"Current result is page {page_num}. If the target was not found, continue with page_num={page_num + 1}.",
        )
    return payload


@mcp.tool()
def list_locations(project_key: str, keyword: str = "", page_size: int = 100, page_num: int = 1) -> Any:
    """List location data from the config API."""
    payload = api_list_locations(project_key, keyword=keyword, page_size=page_size, page_num=page_num)
    return _append_next_page_hint(payload, page_num)


@mcp.tool()
def list_system_tree(project_key: str) -> Any:
    """Get the full system tree from the config API."""
    return api_list_system_tree(project_key)


@mcp.tool()
def list_systems(
    project_key: str,
    page_size: int = 100,
    page_num: int = 1,
    system_type_id: int = 0,
    show_below: bool = True,
) -> Any:
    """List systems by system type."""
    payload = api_list_systems(
        project_key,
        page_size=page_size,
        page_num=page_num,
        system_type_id=system_type_id,
        show_below=show_below,
    )
    return _append_next_page_hint(payload, page_num)


@mcp.tool()
def list_device_types(project_key: str) -> Any:
    """List all device types."""
    return api_list_device_types(project_key)


@mcp.tool()
def list_meter_types(project_key: str) -> Any:
    """List all meter types."""
    return api_list_meter_types(project_key)


@mcp.tool()
def search_devices(
    project_key: str,
    page_size: int = 100,
    page_num: int = 1,
    keyword: str = "",
    location_id: int = 0,
    show_below: bool = True,
    system_ids: list[int] | None = None,
    device_type_ids: list[int] | None = None,
) -> Any:
    """Search devices with id-based filters."""
    payload = api_search_devices(
        project_key,
        page_size=page_size,
        page_num=page_num,
        keyword=keyword,
        location_id=location_id,
        show_below=show_below,
        system_ids=system_ids,
        device_type_ids=device_type_ids,
    )
    return _append_next_page_hint(payload, page_num)


@mcp.tool()
def search_meters(
    project_key: str,
    page_size: int = 100,
    page_num: int = 1,
    keyword: str = "",
    location_id: int = 0,
    show_below: bool = True,
    meter_type_id: int = 0,
    measurement_location_ids: list[int] | None = None,
    measurement_system_ids: list[int] | None = None,
    measurement_device_type_ids: list[int] | None = None,
    status: int | None = None,
) -> Any:
    """Search meters with id-based filters."""
    payload = api_search_meters(
        project_key,
        page_size=page_size,
        page_num=page_num,
        keyword=keyword,
        location_id=location_id,
        show_below=show_below,
        meter_type_id=meter_type_id,
        measurement_location_ids=measurement_location_ids,
        measurement_system_ids=measurement_system_ids,
        measurement_device_type_ids=measurement_device_type_ids,
        status=status,
    )
    return _append_next_page_hint(payload, page_num)


def main() -> None:
    host = os.getenv("MCP_HOST", "0.0.0.0").strip() or "0.0.0.0"
    port = int(os.getenv("MCP_PORT", "8500"))
    path = os.getenv("MCP_PATH", "/mcp").strip() or "/mcp"
    mcp.run(transport="http", host=host, port=port, path=path)


if __name__ == "__main__":
    main()