from fastapi import FastAPI, Depends, HTTPException, Query
from fastapi.middleware.cors import CORSMiddleware
from typing import Optional
from datetime import datetime
import logging

# 配置日志
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)

from app.config import settings
from app.database import get_db, engine, Base
from app.schemas import (
    KlineRequest, KlineResponse, KlineItem,
    ContractInfo as ContractSchema, ContractListResponse,
    DataSourceConfigItem, DataSourceConfigUpdate, DataSourceCreate,
    ApiResponse, HealthResponse, DataSourceStatus,
)
from app.services.kline_service import kline_service
from app.services.contract_service import contract_service
from app.services.datasource.manager import DataSourceManager
from app.models import DataSourceConfig

logger = logging.getLogger(__name__)


app = FastAPI(
    title=settings.PROJECT_NAME,
    version=settings.VERSION,
    docs_url="/docs",
    redoc_url="/redoc",
)

# CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


# ========== 启动事件 ==========
@app.on_event("startup")
async def startup():
    # 创建数据库表
    Base.metadata.create_all(bind=engine)
    # 加载数据源配置
    DataSourceManager.load_enabled_sources()
    # 初始化默认数据源配置（如果不存在）
    _init_default_datasource()


def _init_default_datasource():
    """初始化默认的数据源配置（如果不存在）"""
    from app.database import SessionLocal
    db = SessionLocal()
    try:
        # 初始化 Tushare
        existing = db.query(DataSourceConfig).filter(
            DataSourceConfig.source_name == "tushare"
        ).first()
        if not existing:
            import json
            cfg = DataSourceConfig(
                source_name="tushare",
                display_name="Tushare",
                is_enabled=False,
                config_json=json.dumps({"token": ""}),
                priority=1,
                status="unknown",
            )
            db.add(cfg)

        # 初始化 Akshare
        existing_ak = db.query(DataSourceConfig).filter(
            DataSourceConfig.source_name == "akshare"
        ).first()
        if not existing_ak:
            import json
            cfg_ak = DataSourceConfig(
                source_name="akshare",
                display_name="AKShare",
                is_enabled=False,
                config_json=json.dumps({"max_retries": 3}),
                priority=2,
                status="unknown",
            )
            db.add(cfg_ak)
            
        db.commit()
    finally:
        db.close()


# ========== 健康检查 ==========
@app.get("/api/health", response_model=HealthResponse)
async def health_check():
    services = {}
    try:
        from sqlalchemy import text
        from app.database import engine
        with engine.connect() as conn:
            conn.execute(text("SELECT 1"))
        services["database"] = "ok"
    except Exception as e:
        services["database"] = f"error: {str(e)}"

    try:
        import redis
        r = redis.from_url(settings.REDIS_URL)
        r.ping()
        services["redis"] = "ok"
    except Exception as e:
        services["redis"] = "not configured"  # Redis 非必须

    status = "healthy" if all(v == "ok" for v in services.values()) else "degraded"

    return HealthResponse(
        status=status,
        services=services,
        version=settings.VERSION,
    )


# ========== 合约接口 ==========
@app.get("/api/v1/contracts", response_model=ContractListResponse)
async def list_contracts(
    exchange: Optional[str] = Query(None, description="交易所代码"),
    product: Optional[str] = Query(None, description="品种代码"),
    is_active: Optional[bool] = Query(None, description="是否活跃"),
):
    contracts = contract_service.get_contracts(
        exchange=exchange, product=product, is_active=is_active
    )
    return ContractListResponse(
        total=len(contracts),
        items=[ContractSchema.model_validate(c) for c in contracts],
    )


@app.get("/api/v1/contracts/{symbol}", response_model=ContractSchema)
async def get_contract(symbol: str):
    contract = contract_service.get_contract(symbol)
    if not contract:
        raise HTTPException(status_code=404, detail="合约不存在")
    return ContractSchema.model_validate(contract)


@app.post("/api/v1/contracts/sync")
async def sync_contracts():
    """从数据源同步合约列表"""
    try:
        count = contract_service.sync_contracts()
        return {"code": 0, "message": "同步成功", "data": {"synced": count}}
    except Exception as e:
        return {"code": 1, "message": f"同步失败: {str(e)}", "data": None}


# ========== K线接口 ==========
@app.get("/api/v1/kline", response_model=KlineResponse)
async def get_kline(
    symbol: str = Query(..., description="合约代码"),
    period: str = Query("daily", description="周期: daily/weekly/5m/15m/30m/60m"),
    start_date: Optional[str] = Query(None, description="开始日期 YYYY-MM-DD"),
    end_date: Optional[str] = Query(None, description="结束日期 YYYY-MM-DD"),
    limit: int = Query(500, ge=1, le=5000, description="返回条数"),
):
    logger.info(f"[API-查询K线] 请求参数: symbol={symbol}, period={period}, start_date={start_date}, end_date={end_date}, limit={limit}")
    items = kline_service.get_kline(
        symbol=symbol,
        period=period,
        start_date=start_date,
        end_date=end_date,
        limit=limit,
    )
    logger.info(f"[API-查询K线] 返回 {len(items)} 条记录")
    return KlineResponse(
        symbol=symbol,
        period=period,
        total=len(items),
        items=[KlineItem(**item) for item in items],
    )


@app.post("/api/v1/kline/sync")
async def sync_kline(req: KlineRequest):
    """从数据源同步K线数据"""
    logger.info(f"[API-同步K线] 请求参数: symbol={req.symbol}, period={req.period}, start_date={req.start_date}, end_date={req.end_date}")
    try:
        start = req.start_date or "2020-01-01"
        end = req.end_date or datetime.now().strftime("%Y-%m-%d")
        logger.info(f"[API-同步K线] 使用日期范围: {start} ~ {end}")

        if req.period == "daily":
            count = kline_service.sync_daily(req.symbol, start, end)
        elif req.period == "weekly":
            count = kline_service.sync_weekly(req.symbol, start, end)
        else:
            count = kline_service.sync_intraday(req.symbol, req.period, start, end)

        logger.info(f"[API-同步K线] 同步成功，共同步 {count} 条记录")
        return {"code": 0, "message": "同步成功", "data": {"synced": count}}
    except Exception as e:
        logger.error(f"[API-同步K线] 同步失败: {e}", exc_info=True)
        return {"code": 1, "message": f"同步失败: {str(e)}", "data": None}


# ========== 数据源管理接口 ==========
@app.get("/api/v1/datasources")
async def list_datasources():
    """获取所有数据源状态"""
    sources = DataSourceManager.get_all_sources_status()
    return {"code": 0, "data": sources}


@app.post("/api/v1/datasources")
async def create_datasource(req: DataSourceCreate):
    """创建数据源配置"""
    from app.database import SessionLocal
    db = SessionLocal()
    try:
        existing = db.query(DataSourceConfig).filter(
            DataSourceConfig.source_name == req.source_name
        ).first()
        if existing:
            return {"code": 1, "message": "数据源已存在"}

        cfg = DataSourceConfig(
            source_name=req.source_name,
            display_name=req.display_name or req.source_name,
            is_enabled=False,
            config_json=req.config_json or {},
            priority=req.priority,
            status="unknown",
        )
        db.add(cfg)
        db.commit()
        return {"code": 0, "message": "创建成功", "data": {"id": cfg.id}}
    except Exception as e:
        db.rollback()
        return {"code": 1, "message": f"创建失败: {str(e)}"}
    finally:
        db.close()


@app.put("/api/v1/datasources/{source_name}")
async def update_datasource(source_name: str, req: DataSourceConfigUpdate):
    """更新数据源配置"""
    from app.database import SessionLocal
    db = SessionLocal()
    try:
        cfg = db.query(DataSourceConfig).filter(
            DataSourceConfig.source_name == source_name
        ).first()
        if not cfg:
            return {"code": 1, "message": "数据源不存在"}

        if req.is_enabled is not None:
            cfg.is_enabled = req.is_enabled
        if req.config_json is not None:
            import json
            cfg.config_json = json.dumps(req.config_json)
        if req.priority is not None:
            cfg.priority = req.priority

        db.commit()

        # 重新加载数据源
        DataSourceManager.load_enabled_sources()

        return {"code": 0, "message": "更新成功"}
    except Exception as e:
        db.rollback()
        return {"code": 1, "message": f"更新失败: {str(e)}"}
    finally:
        db.close()


@app.post("/api/v1/datasources/{source_name}/test")
async def test_datasource(source_name: str):
    """测试数据源连接"""
    source = DataSourceManager.get_source(source_name)
    if not source:
        # 尝试创建临时实例测试
        from app.database import SessionLocal
        import json
        db = SessionLocal()
        try:
            cfg = db.query(DataSourceConfig).filter(
                DataSourceConfig.source_name == source_name
            ).first()
            if not cfg:
                return {"code": 1, "message": "数据源不存在"}

            config = json.loads(cfg.config_json) if cfg.config_json else {}
            
            # 动态获取数据源类
            source_class = DataSourceManager._source_map.get(source_name)
            if not source_class:
                return {"code": 1, "message": "不支持的数据源类型"}
            
            source = source_class(config)
        finally:
            db.close()

    ok, msg = source.health_check()
    if ok:
        # 更新状态
        from app.database import SessionLocal
        db = SessionLocal()
        try:
            cfg = db.query(DataSourceConfig).filter(
                DataSourceConfig.source_name == source_name
            ).first()
            if cfg:
                cfg.status = "ok"
                cfg.error_msg = None
                db.commit()
        finally:
            db.close()
        return {"code": 0, "message": "连接成功", "data": {"status": "ok"}}
    else:
        from app.database import SessionLocal
        db = SessionLocal()
        try:
            cfg = db.query(DataSourceConfig).filter(
                DataSourceConfig.source_name == source_name
            ).first()
            if cfg:
                cfg.status = "error"
                cfg.error_msg = msg
                db.commit()
        finally:
            db.close()
        return {"code": 1, "message": f"连接失败: {msg}", "data": {"status": "error"}}