from contextlib import asynccontextmanager
from pathlib import Path

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

from .database import init_db
from .routers.novels import router as novels_router
from .routers.outlines import router as outlines_router
from .routers.characters import router as characters_router
from .routers.chapters import router as chapters_router
from .routers.world_setting import router as world_setting_router
from .routers.ai_config import router as ai_config_router
from .routers.chat import router as chat_router
from .routers.files import router as files_router
from .routers.skills import router as skills_router

# 前端构建产物目录（Docker 中为 /app/static，本地开发时不存在则跳过）
STATIC_DIR = Path(__file__).resolve().parent.parent / "static"


@asynccontextmanager
async def lifespan(app: FastAPI):
    init_db()
    yield


app = FastAPI(title="Noval", version="0.1.0", lifespan=lifespan)

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

app.include_router(novels_router)
app.include_router(outlines_router)
app.include_router(characters_router)
app.include_router(chapters_router)
app.include_router(world_setting_router)
app.include_router(ai_config_router)
app.include_router(chat_router)
app.include_router(files_router)
app.include_router(skills_router)


@app.get("/api/health")
def health():
    return {"status": "ok"}


# 生产环境：serve 前端静态文件（Vue SPA）
if STATIC_DIR.is_dir():
    # 静态资源（js/css/img）
    app.mount("/assets", StaticFiles(directory=STATIC_DIR / "assets"), name="assets")

    # 所有非 /api 路径返回 index.html（Vue Router history 模式）
    @app.get("/{path:path}")
    async def spa_fallback(path: str):
        file_path = STATIC_DIR / path
        if file_path.is_file():
            return FileResponse(file_path)
        return FileResponse(STATIC_DIR / "index.html")