"""FastAPI 应用入口"""

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.database import init_database
from app.routes import regimes, accounts, strategies, matches, match

# 前端构建产物目录（生产部署时由 PM2 单端口托管）
FRONTEND_DIST = Path(__file__).resolve().parent.parent.parent / "frontend" / "dist"

app = FastAPI(
    title="加密货币前置匹配系统",
    description="大盘-周期-阶段-强弱-方向-账户-策略前置匹配（纯本地，无登录）",
    version="1.0.0",
)

# 允许前端跨域（本地开发）
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# 注册 API 路由
app.include_router(regimes.router)
app.include_router(accounts.router)
app.include_router(strategies.router)
app.include_router(matches.router)
app.include_router(match.router)


@app.on_event("startup")
def on_startup():
    """启动时初始化数据库"""
    init_database()


@app.get("/api/health")
def health():
    return {"status": "ok", "message": "加密货币前置匹配系统运行中"}


def _mount_frontend():
    """生产环境：托管 Vue 前端静态资源，支持 SPA 路由"""
    if not FRONTEND_DIST.exists():
        return

    assets_dir = FRONTEND_DIST / "assets"
    if assets_dir.exists():
        app.mount("/assets", StaticFiles(directory=assets_dir), name="assets")

    @app.get("/")
    async def serve_index():
        return FileResponse(FRONTEND_DIST / "index.html")

    @app.get("/{path:path}")
    async def serve_spa(path: str):
        # API 路径不走 SPA 回退
        if path.startswith("api"):
            return {"detail": "Not Found"}
        file = FRONTEND_DIST / path
        if file.is_file():
            return FileResponse(file)
        return FileResponse(FRONTEND_DIST / "index.html")


_mount_frontend()