import sys

from fastapi import FastAPI, Request
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse

from config.settings import load_settings

# 加载配置文件，失败则退出
try:
    settings = load_settings()
except FileNotFoundError as e:
    print(f"配置文件错误: {e}")
    sys.exit(1)
except Exception as e:
    print(f"加载配置失败: {e}")
    sys.exit(1)

from app.api.v1.location import router as location_router
from app.api.v1.box import router as box_router
from app.services.location_service import DuplicateLocationError
from app.services.box_service import ZongpaiNotFoundError, DuplicateBoxItemError, InvalidZongpaiError

app = FastAPI(title="CargoTrace API", version="0.1.0")

app.include_router(location_router, prefix="/CargoTrace")
app.include_router(box_router, prefix="/CargoTrace")


@app.exception_handler(DuplicateLocationError)
async def duplicate_location_handler(request: Request, exc: DuplicateLocationError):
    return JSONResponse(
        status_code=409,
        content={
            "error_code": "DUPLICATE_LOCATION",
            "message": "该总排号已存在货位记录",
            "location_code": exc.location_code,
            "registered_at": exc.registered_at,
        },
    )


@app.exception_handler(RequestValidationError)
async def validation_error_handler(request: Request, exc: RequestValidationError):
    for err in exc.errors():
        msg = err.get("msg", "")
        if "INVALID_ZONGPAI" in msg or "INVALID_LOCATION" in msg or "INVALID_BOX_NO" in msg or "INVALID_QUANTITY" in msg:
            error_code = msg.replace("Value error, ", "")
            return JSONResponse(
                status_code=400,
                content={
                    "error_code": error_code,
                    "message": error_code,
                },
            )
    return JSONResponse(
        status_code=422,
        content={"detail": exc.errors()},
    )


@app.exception_handler(ValueError)
async def value_error_handler(request: Request, exc: ValueError):
    error_code = str(exc)
    return JSONResponse(
        status_code=400,
        content={
            "error_code": error_code,
            "message": error_code,
        },
    )


@app.exception_handler(InvalidZongpaiError)
async def invalid_zongpai_handler(request: Request, exc: InvalidZongpaiError):
    return JSONResponse(
        status_code=400,
        content={
            "error_code": "INVALID_ZONGPAI",
            "message": "总排号格式不合法",
        },
    )


@app.exception_handler(ZongpaiNotFoundError)
async def zongpai_not_found_handler(request: Request, exc: ZongpaiNotFoundError):
    return JSONResponse(
        status_code=404,
        content={
            "error_code": "ZONGPAI_NOT_FOUND",
            "message": "未找到该总排号对应的排产号信息",
        },
    )


@app.exception_handler(DuplicateBoxItemError)
async def duplicate_box_handler(request: Request, exc: DuplicateBoxItemError):
    return JSONResponse(
        status_code=409,
        content={
            "error_code": "DUPLICATE_BOX_NO",
            "message": f"排产号 {exc.paichan_no} 下箱号 {exc.box_no} 已存在",
            "paichan_no": exc.paichan_no,
            "box_no": exc.box_no,
        },
    )


@app.get("/")
async def root():
    return {"message": "Welcome to CargoTrace API"}