"""配置管理 API 路由 - 品种配置上传/批量获取/批量任务创建"""

import json
import logging
from pathlib import Path

from fastapi import APIRouter, Depends, File, HTTPException, Request, UploadFile
from pydantic import BaseModel
from sqlalchemy.ext.asyncio import AsyncSession

from app.database import get_db
from app.schemas import CandleItem, SymbolDataResponse, TimeframeData
from app.services.cache import (
    check_cache_status,
    create_task,
    get_cached_data,
    save_market_data,
)
from app.services.collector import fetch_symbol_data
from app.services.scheduler import add_job

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/config", tags=["品种配置"])

# 配置文件存储路径
CONFIG_DIR = Path(__file__).resolve().parent.parent.parent / "config"
CONFIG_FILE = CONFIG_DIR / "symbols_config.json"


class BatchFetchRequest(BaseModel):
    """批量获取请求体。"""

    periods: str | None = None
    data_type: str = "futures"
    selected_symbols: str | None = None


def _ensure_config_dir() -> None:
    CONFIG_DIR.mkdir(parents=True, exist_ok=True)


def _normalize_candles(candles: list[dict]) -> list[dict]:
    """将K线数据中的 time 字段统一为 datetime。"""
    normalized = []
    for c in candles:
        candle_dict = dict(c)
        if "time" in candle_dict and "datetime" not in candle_dict:
            candle_dict["datetime"] = candle_dict.pop("time")
        normalized.append(candle_dict)
    return normalized


def _build_timeframes(
    timeframes_dict: dict[str, list],
    periods: list[str],
    fetched_at: str,
) -> list[TimeframeData]:
    """从 timeframes 字典构建 TimeframeData 列表。"""
    result = []
    for p in periods:
        candles = timeframes_dict.get(p, [])
        if candles:
            normalized = _normalize_candles(candles)
            result.append(
                TimeframeData(
                    period=p,
                    candles=[CandleItem(**c) for c in normalized],
                    candle_count=len(normalized),
                    fetched_at=fetched_at,
                )
            )
    return result


@router.get("")
async def get_config():
    """获取当前品种配置。"""
    _ensure_config_dir()
    if not CONFIG_FILE.exists():
        return {"futures": {}, "stock": {}}
    with open(CONFIG_FILE, encoding="utf-8") as f:
        return json.load(f)


@router.post("/upload")
async def upload_config(
    file: UploadFile | None = File(None),
    request: Request = None,
):
    """上传品种配置文件（JSON 格式）。"""
    _ensure_config_dir()

    try:
        if file:
            content = await file.read()
            data = json.loads(content)
        else:
            body = await request.body()
            if not body:
                raise HTTPException(status_code=400, detail="请提供配置文件或JSON数据")
            data = json.loads(body)

        if not isinstance(data, dict):
            raise HTTPException(status_code=400, detail="配置文件必须是 JSON 对象")

        with open(CONFIG_FILE, "w", encoding="utf-8") as f:
            json.dump(data, f, ensure_ascii=False, indent=4)

        futures_count = len(data.get("futures", {}))
        stock_count = len(data.get("stock", {}))

        return {
            "message": "配置文件上传成功",
            "futures_symbols": futures_count,
            "stock_symbols": stock_count,
            "symbols": data,
        }
    except json.JSONDecodeError as e:
        raise HTTPException(status_code=400, detail="无效的 JSON 格式") from e


@router.post("/batch-fetch-all")
async def batch_fetch_all(
    request: BatchFetchRequest,
    db: AsyncSession = Depends(get_db),
):
    """根据配置文件批量获取所有品种数据（智能缓存）。"""
    periods = request.periods
    data_type = request.data_type
    selected_symbols = request.selected_symbols
    _ensure_config_dir()

    if not CONFIG_FILE.exists():
        raise HTTPException(status_code=400, detail="请先上传品种配置文件")

    with open(CONFIG_FILE, encoding="utf-8") as f:
        config = json.load(f)

    symbols_dict = config.get(data_type, {})
    if not symbols_dict:
        raise HTTPException(status_code=400, detail=f"配置中没有 {data_type} 类型的品种")

    if selected_symbols:
        symbol_list = [s.strip() for s in selected_symbols.split(",") if s.strip()]
        symbols_dict = {
            name: code for name, code in symbols_dict.items() if code in symbol_list
        }
        if not symbols_dict:
            raise HTTPException(status_code=400, detail="选定的合约不在配置中")

    period_list = (
        [p.strip() for p in periods.split(",")]
        if periods
        else ["5min", "15min", "30min", "60min", "daily"]
    )

    results: dict = {
        "total": len(symbols_dict),
        "success": [],
        "failed": [],
        "cached": [],
        "details": {},
    }

    for name, symbol in symbols_dict.items():
        logger.info("处理品种: %s (%s)", name, symbol)

        cache_status = await check_cache_status(db, symbol, data_type, period_list)

        if cache_status["all_valid"]:
            results["cached"].append({"name": name, "symbol": symbol})
            cached = await get_cached_data(db, symbol, data_type, period_list)
            timeframes = _build_timeframes(
                cached["timeframes"], period_list, cached.get("timestamp", "")
            )
            results["details"][symbol] = SymbolDataResponse(
                symbol=symbol,
                data_type=data_type,
                current_price=cached.get("current_price"),
                timeframes=timeframes,
                source="cache",
            )
            results["success"].append({"name": name, "symbol": symbol})
            continue

        need_fetch = cache_status["missing_periods"]
        logger.info("需要采集的周期: %s", need_fetch)
        result = await fetch_symbol_data(symbol, data_type, need_fetch)

        if result and result.get("timeframes"):
            logger.info("采集到 %d 个周期的数据", len(result["timeframes"]))
            await save_market_data(db, symbol, result)

            all_timeframes: dict[str, list] = {}
            if cache_status["valid_periods"]:
                existing = await get_cached_data(
                    db, symbol, data_type, cache_status["valid_periods"]
                )
                if existing:
                    all_timeframes.update(existing["timeframes"])
            all_timeframes.update(result["timeframes"])

            timeframes = _build_timeframes(
                all_timeframes, period_list, result.get("timestamp", "")
            )
            source = "live+cache" if cache_status["valid_periods"] else "live"
            results["details"][symbol] = SymbolDataResponse(
                symbol=symbol,
                data_type=data_type,
                current_price=result.get("current_price"),
                timeframes=timeframes,
                source=source,
            )
            results["success"].append({"name": name, "symbol": symbol})
            logger.info("采集成功: %s", symbol)
        else:
            error_msg = (result or {}).get("error", "未知错误")
            logger.error("采集失败: %s, 错误: %s", symbol, error_msg)
            results["failed"].append({
                "name": name,
                "symbol": symbol,
                "error": error_msg,
            })

    return results


@router.post("/batch-tasks")
async def batch_create_tasks(
    periods: str | None = None,
    interval_seconds: int = 300,
    data_type: str = "futures",
    db: AsyncSession = Depends(get_db),
):
    """根据配置文件为所有品种批量创建定时任务。"""
    _ensure_config_dir()
    if not CONFIG_FILE.exists():
        raise HTTPException(status_code=400, detail="请先上传品种配置文件")

    with open(CONFIG_FILE, encoding="utf-8") as f:
        config = json.load(f)

    symbols_dict = config.get(data_type, {})
    if not symbols_dict:
        raise HTTPException(status_code=400, detail=f"配置中没有 {data_type} 类型的品种")

    period_list = (
        [p.strip() for p in periods.split(",")]
        if periods
        else ["5min", "15min", "30min", "60min", "daily"]
    )
    periods_str = ",".join(period_list)

    results: dict = {"total": len(symbols_dict), "created": [], "failed": []}

    for name, symbol in symbols_dict.items():
        try:
            task = await create_task(
                db=db,
                symbol=symbol,
                data_type=data_type,
                periods=periods_str,
                interval_seconds=interval_seconds,
            )
            job_id = await add_job(task.id, task.interval_seconds)
            task.job_id = job_id
            await db.flush()

            results["created"].append({
                "name": name,
                "symbol": symbol,
                "task_id": task.id,
                "job_id": job_id,
                "interval": interval_seconds,
            })
        except Exception as e:
            results["failed"].append({
                "name": name,
                "symbol": symbol,
                "error": str(e),
            })

    return results