from fastapi import FastAPI, HTTPException, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from pathlib import Path

from app.config import settings
from app.middleware import RequestContextMiddleware
from app.routers import admin, analysis, auth, children, reports, training, videos

CONTRACTS_OPENAPI = Path(__file__).resolve().parents[3] / "contracts" / "openapi.yaml"

app = FastAPI(
    title="Kids AI Posture Platform API",
    version="0.6.0",
    description=(
        "儿童 AI 体态管理平台 API · Sprint 5。"
        "MediaPipe 帧级评分 + PDF 导出 + OSS 生产配置 + H5/小程序对接。"
    ),
)

app.add_middleware(RequestContextMiddleware)

_cors_origins = ["*"] if settings.app_debug else settings.cors_origin_list
app.add_middleware(
    CORSMiddleware,
    allow_origins=_cors_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(auth.router)
app.include_router(children.router)
app.include_router(videos.router)
app.include_router(analysis.router)
app.include_router(reports.router)
app.include_router(training.router)
app.include_router(admin.router)


@app.exception_handler(HTTPException)
async def http_exception_handler(request: Request, exc: HTTPException):
    if isinstance(exc.detail, dict) and "meta" in exc.detail:
        return JSONResponse(status_code=exc.status_code, content=exc.detail)
    return JSONResponse(status_code=exc.status_code, content={"detail": exc.detail})


@app.get("/health")
def health():
    return {"status": "ok", "env": settings.app_env, "stage": "sprint5"}


@app.get("/")
def root():
    return {
        "name": settings.app_name,
        "docs": "/docs",
        "contract": str(CONTRACTS_OPENAPI),
        "stage": "sprint5-mediapipe-pdf-oss",
    }