"""管理服务 - 对应Go的internal/service/admin.go"""
from datetime import datetime
from typing import Optional
import uuid

from sqlalchemy.orm import Session
from sqlalchemy import text

from app.models import (
    DataSourceStatusData, DataSourceInfo, SourceSwitchRequest,
    BackfillRequest, HealthResponse, DataSourceStatus
)
from app.core.config import get_config, save_config
from app.core.logger import info


class AdminService:
    """管理服务"""
    
    def __init__(self, db: Session):
        self.db = db
    
    def get_data_source_status(self) -> DataSourceStatusData:
        """获取数据源状态"""
        config = get_config()
        
        try:
            # 查询数据库中的数据源配置
            result = self.db.execute(text("""
                SELECT asset_class, active_source, standby_sources, updated_at
                FROM data_source_config
            """))
            
            data = DataSourceStatusData()
            has_data = False
            
            for row in result:
                has_data = True
                asset_class, active_source, standby_sources, updated_at = row
                
                info_obj = DataSourceInfo(
                    active_source=active_source,
                    standby_sources=standby_sources or [],
                    status=DataSourceStatus.HEALTHY
                )
                
                if asset_class == "stock":
                    data.stock = info_obj
                elif asset_class == "futures":
                    data.futures = info_obj
            
            # 如果没有数据库配置，使用配置文件中的设置
            if not has_data:
                data.stock.active_source = config.sources.stock.active
                data.futures.active_source = config.sources.futures.active
            
            return data
        except Exception as e:
            info(f"Data source config not found, using config file: {e}")
            # 使用配置文件中的设置
            data = DataSourceStatusData()
            data.stock.active_source = config.sources.stock.active
            data.futures.active_source = config.sources.futures.active
            return data
    
    def switch_data_source(self, req: SourceSwitchRequest) -> None:
        """切换数据源"""
        from app.core.config import get_config, save_config
        
        config = get_config()
        
        # 更新内存中的配置
        if req.asset_class.value == "all":
            config.sources.stock.active = req.source
            config.sources.futures.active = req.source
        elif req.asset_class.value == "stock":
            config.sources.stock.active = req.source
        elif req.asset_class.value == "futures":
            config.sources.futures.active = req.source
        
        # 保存到配置文件
        try:
            save_config(config)
        except Exception as e:
            info(f"Failed to save config: {e}")
        
        # 同时尝试保存到数据库（如果支持）
        try:
            asset_classes = []
            if req.asset_class.value == "all":
                asset_classes = ["stock", "futures"]
            else:
                asset_classes = [req.asset_class.value]
            
            for ac in asset_classes:
                # MySQL: INSERT ... ON DUPLICATE KEY UPDATE
                self.db.execute(
                    text("""
                        INSERT INTO data_source_config 
                        (asset_class, active_source, updated_at)
                        VALUES (:asset_class, :source, NOW())
                        ON DUPLICATE KEY UPDATE
                            active_source = VALUES(active_source),
                            updated_at = VALUES(updated_at)
                    """),
                    {"asset_class": ac, "source": req.source}
                )
            
            self.db.commit()
        except Exception as e:
            info(f"Database update failed (using config file only): {e}")
            self.db.rollback()
        
        # 如果需要同步补录，启动后台任务
        if req.sync_backfill:
            info(f"Starting backfill for {req.asset_class} from {req.start_date}")
            # TODO: 启动异步补录任务
    
    def backfill_data(self, req: BackfillRequest) -> str:
        """历史数据补录"""
        task_id = str(uuid.uuid4())
        
        info(f"Starting backfill task {task_id} for {req.asset_class}")
        # TODO: 将补录任务存入数据库，启动后台Worker执行
        
        return task_id
    
    def health_check(self) -> HealthResponse:
        """健康检查"""
        try:
            # 检查数据库连接
            self.db.execute(text("SELECT 1"))
            
            return HealthResponse(
                status="healthy",
                timestamp=datetime.now()
            )
        except Exception as e:
            return HealthResponse(
                status=f"unhealthy: {str(e)}",
                timestamp=datetime.now()
            )