from fastapi import APIRouter, Query, Path, Body, HTTPException, BackgroundTasks
from typing import Dict, List, Optional, Any, Union
from pydantic import BaseModel, Field
from function.optimize_manager import OptimizeManager
import logging
from datetime import datetime

# 创建路由
router = APIRouter()

# 初始化优化管理器
optimize_manager = OptimizeManager()

# 初始化日志
logger = logging.getLogger(__name__)

# 请求体模型定义
class OptimizationRequest(BaseModel):
    run_id: str = Field(..., description="已训练模型的运行ID")
    method: str = Field(..., description="优化方法名称，如 'GridSearchCV'")
    parameters: Dict = Field(..., description="优化方法参数")
    data_path: Optional[str] = Field(None, description="数据集路径")
    output_dir: Optional[str] = Field(None, description="输出目录路径")
    experiment_name: str = Field(..., description="实验名称")
    
    class Config:
        json_schema_extra = {
            "example": {
                "run_id": "bd3697dc238c4d1587e0f4f319d04448",
                "method": "GridSearchCV",
                "parameters": {
                    "max_depth": [3, 5, 7],
                    "n_estimators": [50, 100, 200],
                    "min_samples_split": [2, 5, 10]
                },
                "data_path": "dataset/dataset_processed/test_optimize/train.csv",
                "output_dir": None,
                "experiment_name": "测试模型优化方法"
            }
        }

# API接口实现
@router.get("/methods", summary="获取优化方法列表")
async def get_optimize_methods():
    """获取所有可用的模型优化方法列表"""
    try:
        methods = optimize_manager.get_optimize_methods()
        return methods
    except Exception as e:
        logger.error(f"Error getting optimization methods: {str(e)}")
        raise HTTPException(status_code=500, detail=f"获取优化方法失败: {str(e)}")

@router.get("/method/{method_name}", summary="获取优化方法详情")
async def get_optimize_method_details(
    method_name: str = Path(..., description="优化方法名称")
):
    """获取特定优化方法的详细信息"""
    try:
        method_details = optimize_manager.get_optimize_method_details(method_name)
        return method_details
    except Exception as e:
        logger.error(f"Error getting method details for {method_name}: {str(e)}")
        raise HTTPException(status_code=500, detail=f"获取方法详情失败: {str(e)}")

@router.post("/model", summary="执行模型优化")
async def optimize_model(
    request: OptimizationRequest = Body(..., description="优化请求参数")
):
    """启动模型优化任务"""
    try:
        # 执行优化任务
        result = optimize_manager.run_optimization(
            run_id=request.run_id,
            method=request.method,
            parameters=request.parameters,
            data_path=request.data_path,
            output_dir=request.output_dir,
            experiment_name=request.experiment_name
        )
        
        return {
            "status": "success",
            "message": "优化任务已执行",
            "run_id": result['optimization'].get("run_id"),
            "optimized_model_id": result['optimization'].get("optimized_model_id")
            # "best_params": result.get("best_params"),
            # "best_score": result.get("best_score"),
            # "optimized_model_id": result.get("optimized_model_id")
        }
    except Exception as e:
        logger.error(f"Error starting optimization task: {str(e)}")
        raise HTTPException(status_code=500, detail=f"启动优化任务失败: {str(e)}")

@router.get("/tasks", summary="获取优化任务列表")
async def get_optimization_tasks(
    experiment_name: Optional[str] = None,
    page: int = Query(1, description="页码", ge=1),
    page_size: int = Query(10, description="每页任务数量", ge=1, le=100),
    status: Optional[str] = Query(None, description="任务状态过滤")
):
    """获取优化任务列表"""
    try:
        result = optimize_manager.get_optimization_tasks(experiment_name,page, page_size, status)
        return result
    except Exception as e:
        logger.error(f"Error getting optimization tasks: {str(e)}")
        raise HTTPException(status_code=500, detail=f"获取优化任务列表失败: {str(e)}")

@router.get("/task/{task_id}", summary="获取优化任务详情")
async def get_optimization_task(
    task_id: str = Path(..., description="任务ID")
):
    """获取特定优化任务的详细信息"""
    try:
        result = optimize_manager.get_optimization_task(task_id)
        if result["status"] == "error":
            raise HTTPException(status_code=404, detail=result["message"])
        return result
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error getting optimization task {task_id}: {str(e)}")
        raise HTTPException(status_code=500, detail=f"获取优化任务详情失败: {str(e)}")

@router.post("/task/{task_id}/cancel", summary="取消优化任务")
async def cancel_optimization_task(
    task_id: str = Path(..., description="任务ID")
):
    """取消正在运行的优化任务"""
    try:
        result = optimize_manager.cancel_optimization_task(task_id)
        if result["status"] == "error":
            raise HTTPException(status_code=400, detail=result["message"])
        return result
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error cancelling optimization task {task_id}: {str(e)}")
        raise HTTPException(status_code=500, detail=f"取消优化任务失败: {str(e)}")

@router.delete("/task/{task_id}", summary="删除优化任务")
async def delete_optimization_task(
    task_id: str = Path(..., description="任务ID")
):
    """删除优化任务及其相关资源"""
    try:
        result = optimize_manager.delete_optimization_task(task_id)
        if result["status"] == "error":
            if "任务不存在" in result["message"]:
                raise HTTPException(status_code=404, detail=result["message"])
            elif "任务正在运行中" in result.get("details", {}).get("reason", ""):
                raise HTTPException(status_code=400, detail="无法删除正在运行的任务")
            else:
                raise HTTPException(status_code=400, detail=result["message"])
        return result
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error deleting optimization task {task_id}: {str(e)}")
        raise HTTPException(status_code=500, detail=f"删除优化任务失败: {str(e)}")