"""FastAPI 入口。"""
from __future__ import annotations

import logging
from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from app import __version__
from app.api import analysis, backtest, data, ext_data, financials, indices, intraday, kline, monitor_rules, alerts, overview, pipeline, screener, settings as settings_api, signals, strategy, watchlist
from app.api.routes import router as core_router
from app.config import settings
from app.jobs import daily_pipeline
from app.services.quote_service import QuoteService
from app.tickflow import client as tf_client
from app.tickflow.policy import detect_capabilities
from app.tickflow.repository import DataStore, KlineRepository

logging.basicConfig(
    level=settings.log_level,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
)
logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    logger.info(
        "TickFlow Stock Panel v%s starting (mode=%s)",
        __version__, tf_client.current_mode(),
    )

    # 数据层
    store = DataStore()
    repo = KlineRepository(store)
    app.state.datastore = store
    app.state.repo = repo

    # Polars 缓存预热
    repo.refresh_cache()

    # 能力探测
    capset = detect_capabilities()
    app.state.capabilities = capset
    logger.info("ready; %d capabilities active", len(capset.all()))

    # 全局行情服务
    qs = QuoteService()
    app.state.quote_service = qs
    qs.set_repo(repo)
    qs.boot_check()

    # QuoteService 需要访问 strategy_monitor 等单例
    # 先创建 strategy_monitor，再注入 app.state
    from app.strategy.monitor import StrategyMonitorService
    strategy_monitor = StrategyMonitorService()
    app.state.strategy_monitor = strategy_monitor
    qs.set_app_state(app.state)

    # 五档盘口 sealed 服务(真假涨停/跌停, 独立旁路线)
    from app.services.depth_service import DepthService
    depth_service = DepthService()
    depth_service.set_repo(repo)
    depth_service.set_app_state(app.state)
    app.state.depth_service = depth_service

    # 启动调度器(若 enriched 数据为空,首次启动可手动 POST /api/pipeline/run)
    try:
        daily_pipeline.set_app_state(app.state)  # 供 depth_finalize job 访问 depth_service
        scheduler = daily_pipeline.start_scheduler(repo, capset)
        app.state.scheduler = scheduler
    except Exception as e:  # noqa: BLE001
        logger.warning("scheduler not started: %s", e)
        app.state.scheduler = None

    # depth sealed: 启动补跑(当天文件不存在) + 盘中轮询(有能力时)
    try:
        depth_service.boot_check()
        depth_service.start_polling()
    except Exception as e:  # noqa: BLE001
        logger.warning("depth_service init failed: %s", e)

    # 扩展数据定时拉取
    from app.services.ext_pull import pull_scheduler
    pull_scheduler.start(store.data_dir)
    pull_scheduler.refresh(store.data_dir)
    app.state.pull_scheduler = pull_scheduler

    # 财务数据独立调度 (需 Expert 套餐)
    from app.services.financial_sync import financial_scheduler
    financial_scheduler.start(store.data_dir, capset)
    app.state.financial_scheduler = financial_scheduler

    # 策略引擎
    from app.strategy.engine import StrategyEngine
    from app.strategy.monitor import StrategyMonitorService
    from app.services.screener import ScreenerService

    _screener_svc = ScreenerService(repo)
    strategy_dirs = [
        Path(__file__).resolve().parent / "strategy" / "builtin",
        store.data_dir / "strategies" / "custom",
        store.data_dir / "strategies" / "ai",
    ]
    strategy_engine = StrategyEngine(
        enriched_loader=_screener_svc._load_enriched_for_date,
        enriched_history_loader=_screener_svc._load_enriched_history,
        strategy_dirs=strategy_dirs,
    )
    app.state.strategy_engine = strategy_engine
    logger.info("strategy engine loaded: %d strategies", len(strategy_engine.list_strategies()))

    # 通用监控规则引擎: 启动时 reload 规则到内存态 (修复重启后告警失效)
    from app.strategy.monitor import MonitorRuleEngine
    from app.strategy import monitor_rules as mr_store
    from app.services import preferences
    monitor_engine = MonitorRuleEngine()
    monitor_engine.set_strategy_engine(strategy_engine)
    monitor_engine.set_data_dir(store.data_dir)

    # 自动迁移: 把旧 strategy_monitor_ids 同步为 type=strategy 规则 (统一到监控页)
    try:
        if preferences.get_strategy_monitor_enabled():
            ids = preferences.get_strategy_monitor_ids()
            if ids:
                names = {s.id: s.name for s in strategy_engine.list_strategies()}
                mr_store.migrate_strategy_monitors(store.data_dir, ids, names)
                logger.info("strategy monitor migrated: %d strategies", len(ids))
    except Exception as e:  # noqa: BLE001
        logger.warning("strategy monitor migration failed: %s", e)

    try:
        rules = mr_store.load_all(store.data_dir)
        monitor_engine.set_rules(rules)
        logger.info("monitor engine loaded: %d rules", monitor_engine.rule_count)
    except Exception as e:  # noqa: BLE001
        logger.warning("monitor engine load failed: %s", e)
    app.state.monitor_engine = monitor_engine

    yield

    if app.state.scheduler:
        app.state.scheduler.shutdown(wait=False)
    ps = getattr(app.state, "pull_scheduler", None)
    if ps:
        ps.stop()
    fsc = getattr(app.state, "financial_scheduler", None)
    if fsc:
        fsc.stop()
    qs = getattr(app.state, "quote_service", None)
    if qs:
        qs.stop()
    dsvc = getattr(app.state, "depth_service", None)
    if dsvc:
        dsvc.stop_polling()
    logger.info("shutdown")


app = FastAPI(
    title="TickFlow Stock Panel",
    version=__version__,
    description="A 股选股 + 回测面板 — TickFlow 适配",
    lifespan=lifespan,
)

# CORS: 允许局域网访问 (自托管场景, 放开所有来源)
# 注: allow_credentials=True 与 allow_origins=['*'] 不能共存 (浏览器规范),
# 本项目认证走 header (API Key), 不依赖 cookie, 故关闭 credentials 换取通配来源。
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=False,
    allow_methods=["*"],
    allow_headers=["*"],
)

# 路由
app.include_router(core_router)
app.include_router(kline.router)
app.include_router(watchlist.router)
app.include_router(screener.router)
app.include_router(backtest.router)
app.include_router(intraday.router)
app.include_router(indices.router)
app.include_router(overview.router)
app.include_router(analysis.router)
app.include_router(pipeline.router)
app.include_router(data.router)
app.include_router(ext_data.router)
app.include_router(financials.router)
app.include_router(settings_api.router)
app.include_router(strategy.router)
app.include_router(signals.router)
app.include_router(monitor_rules.router)
app.include_router(alerts.router)


# 能力门控异常 → 403(而非默认 500)
# 业务代码用 capset.require(Cap.X) 断言能力,缺失时抛 CapabilityDenied;
# 若不注册 handler 会冒泡成 500 Internal Server Error,对前端不友好且语义错误。
from fastapi import Request
from fastapi.responses import JSONResponse
from app.tickflow.capabilities import CapabilityDenied


@app.exception_handler(CapabilityDenied)
async def capability_denied_handler(request: Request, exc: CapabilityDenied) -> JSONResponse:
    return JSONResponse(
        status_code=403,
        content={"detail": str(exc), "suggestion": exc.suggestion},
    )

# 生产期静态文件(前端 dist)
_static = Path(settings.static_dir)
if _static.exists():
    if (_static / "assets").exists():
        app.mount("/assets", StaticFiles(directory=_static / "assets"), name="assets")

    @app.get("/{full_path:path}", include_in_schema=False)
    def spa_fallback(full_path: str):  # noqa: ARG001
        """所有未匹配路径回退到 index.html — React Router 接管。

        index.html 禁止缓存 (Cache-Control: no-store), 确保浏览器每次拿到
        最新版本引用的 JS/CSS 文件名 (assets 带 hash, 可长缓存)。
        """
        index = _static / "index.html"
        if index.exists():
            return FileResponse(
                index,
                headers={"Cache-Control": "no-store, must-revalidate"},
            )
        return {"error": "frontend not built"}
