"""
系统状态 API 端点
提供 GET /api/system/status。
"""

import os
import logging
from pathlib import Path

from fastapi import APIRouter

from app.config.settings import settings

logger = logging.getLogger(__name__)

router = APIRouter()


def _detect_huggingface_environment() -> dict:
    """检测 HuggingFace 环境

    只输出非敏感摘要，不记录密钥或敏感环境变量。

    Returns:
        包含 is_huggingface 和环境摘要的字典
    """
    # 检测 HuggingFace 相关环境变量
    hf_indicators = [
        "SPACE_ID",
        "SPACE_REPO_ID",
        "SPACE_SDK",
        "HF_HOME",
        "HUGGINGFACE_HUB_TOKEN",
    ]

    detected_vars = []
    for var in hf_indicators:
        if os.environ.get(var):
            detected_vars.append(var)

    is_huggingface = len(detected_vars) > 0

    return {
        "is_huggingface": is_huggingface,
        "detected_indicators": detected_vars,
        "note": "HuggingFace 环境检测基于环境变量，不记录敏感值",
    }


def _get_dependency_policy() -> dict:
    """获取依赖策略

    Returns:
        依赖策略描述
    """
    return {
        "check_only": True,
        "install_disabled": True,
        "description": "只检查依赖是否满足，不执行安装操作",
        "supported_operators": ["==", ">=", "<=", ">", "<"],
        "limitations": "复杂依赖解析有限，覆盖常见 ==/>=/<= 和包缺失",
    }


def _get_unsupported_actions() -> list:
    """获取不支持的操作列表

    Returns:
        不支持的操作描述列表
    """
    return [
        {
            "action": "install",
            "description": "页面不支持运行时安装插件",
            "reason": "插件随部署注入",
        },
        {
            "action": "uninstall",
            "description": "页面不支持卸载插件",
            "reason": "插件随部署注入",
        },
        {
            "action": "restart",
            "description": "页面不支持重启服务",
            "reason": "HuggingFace Spaces 自动管理",
        },
        {
            "action": "validate_git",
            "description": "页面不支持 Git 仓库校验",
            "reason": "插件随部署注入",
        },
    ]


def _get_deployment_instructions() -> dict:
    """获取部署说明

    Returns:
        部署说明
    """
    return {
        "platform": "HuggingFace Spaces",
        "plugin_injection": "插件通过部署时注入，不支持运行时安装",
        "directory": str(settings.PLUGINS_DIR),
        "state_file": str(settings.DATA_DIR / "plugin_state.json"),
        "notes": [
            "插件目录在部署时创建",
            "状态文件保存用户启停状态",
            "HuggingFace 未启用持久存储时，状态文件可能随重建丢失",
        ],
    }


def _get_storage_summary() -> dict:
    """获取存储摘要

    Returns:
        存储风险和状态
    """
    data_dir = settings.DATA_DIR
    state_file = data_dir / "plugin_state.json"

    return {
        "data_directory": str(data_dir),
        "state_file_exists": state_file.exists(),
        "persistent_storage_warning": "HuggingFace 未启用持久存储时，data/ 目录可能随 Space 重建丢失",
    }


@router.get("/status")
async def get_system_status():
    """获取系统状态

    Returns:
        包含环境、插件目录、依赖策略、部署说明、不支持动作、存储风险和 MCP 摘要的字典
    """
    # 检测 HuggingFace 环境
    environment = _detect_huggingface_environment()

    # 获取插件摘要
    try:
        from app.plugins.manager import get_plugin_manager
        manager = get_plugin_manager()
        plugin_summary = manager.get_system_plugin_summary()
    except Exception as e:
        logger.warning(f"获取插件摘要失败: {e}")
        plugin_summary = {
            "total": 0,
            "enabled": 0,
            "disabled": 0,
            "error": 0,
            "plugin_directory": str(settings.PLUGINS_DIR),
        }

    # 获取 MCP 摘要
    try:
        from app.mcp.plugin_registry import get_plugin_registry
        registry = get_plugin_registry()
        mcp_status = registry.get_mcp_status()
        mcp_summary = {
            "total_tools": mcp_status["total_tools"],
            "available_tools": mcp_status["available_tools"],
            "unavailable_tools": mcp_status["unavailable_tools"],
        }
    except Exception as e:
        logger.warning(f"获取 MCP 摘要失败: {e}")
        mcp_summary = {
            "total_tools": 0,
            "available_tools": 0,
            "unavailable_tools": 0,
        }

    return {
        "environment": environment,
        "plugin_directory": str(settings.PLUGINS_DIR),
        "plugin_summary": plugin_summary,
        "dependency_policy": _get_dependency_policy(),
        "deployment_instructions": _get_deployment_instructions(),
        "unsupported_actions": _get_unsupported_actions(),
        "storage_summary": _get_storage_summary(),
        "mcp_summary": mcp_summary,
    }