from decimal import Decimal
from config import settings
from fastapi import FastAPI, Depends
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel, field_validator
from typing import List, Optional
from datetime import datetime, timedelta, date
from SQLAlchemy import ItemTrackManager, ItemTrack
from auth import get_current_user

app = FastAPI(title=settings.TITLE, version=settings.VERSION, debug=settings.DEBUG)

itemTrackManager = ItemTrackManager(settings.DATABASE_URL)

# CORS 配置
app.add_middleware(
    CORSMiddleware,
    allow_credentials=True,
    allow_origin_regex=r"http[s]?://172\.30\.0\..*:5173|http[s]?://.*\.yuany3721\.site|http[s]?://yuany3721\.site",
    allow_methods=["GET", "POST"],
    allow_headers=["*"],
)

# 认证依赖 - 所有路由都需要认证
dependencies = [Depends(get_current_user)]


@app.get("/item_track/")
async def root():
    return {"api": "item_track", "message": "tracking items backend", "auth": "Protected by Authentik OIDC"}


@app.get("/item_track/get_all_items", dependencies=dependencies)
async def get_all_items():
    """
    获取所有未删除的商品

    Returns:
        list: 商品列表
    """
    items = itemTrackManager.get_all_items()
    res = [item.__dict__ for item in items]
    for r in res:
        r.pop("_sa_instance_state", None)
        if isinstance(r["discontinued_at"], datetime):
            r["till_now"] = (datetime.now() - r["discontinued_at"]).days
            r["inuse"] = False
        else:
            r["till_now"] = (datetime.now() - r["start_at"]).days
            r["inuse"] = True
    return res


@app.get("/item_track/get_item/{item_id}", dependencies=dependencies)
async def get_item(item_id: int):
    """
    获取指定ID的商品

    Args:
        item_id: 商品ID

    Returns:
        ItemTrack: 商品数据
    """
    item = itemTrackManager.get_item_by_id(item_id)
    if item:
        res = item.__dict__
        res.pop("_sa_instance_state", None)
        if isinstance(res["discontinued_at"], datetime):
            res["till_now"] = (datetime.now() - res["discontinued_at"]).days
            res["inuse"] = False
        else:
            res["till_now"] = (datetime.now() - res["start_at"]).days
            res["inuse"] = True
        return res
    return {}


class CreateItemRequest(BaseModel):
    name: str
    price: Decimal = Decimal("0")
    start_at: date = datetime.now().date()
    discontinued_at: Optional[date] = None
    discontinued_price: Decimal = Decimal("0")
    notes: str = ""

    @field_validator('discontinued_at', mode='before')
    def handle_empty_string(cls, v):
        if v == "":
            return None
        return v


@app.post("/item_track/create_item", dependencies=dependencies)
async def create_item(item: CreateItemRequest):
    """
    创建新商品

    Args:
        item: 商品数据

    Returns:
        BaseModel: 创建的商品
    """
    return itemTrackManager.create_item(
        name=item.name,
        price=item.price,
        start_at=item.start_at,
        discontinued_at=item.discontinued_at,
        discontinued_price=item.discontinued_price,
        notes=item.notes,
    )


class UpdateItemRequest(BaseModel):
    id: int
    name: str
    price: Decimal = Decimal("0")
    start_at: date = datetime.now().date()
    discontinued_at: Optional[date] = None
    discontinued_price: Decimal = Decimal("0")
    notes: str = ""

    @field_validator('discontinued_at', mode='before')
    def handle_empty_string(cls, v):
        if v == "":
            return None
        return v


@app.post("/item_track/update_item", dependencies=dependencies)
async def update_item(item: UpdateItemRequest):
    """
    更新商品信息

    Args:
        item: 商品数据

    Returns:
        BaseModel: 更新的商品
    """
    print(item)
    return itemTrackManager.update_item(
        id=item.id,
        name=item.name,
        price=item.price,
        start_at=item.start_at,
        discontinued_at=item.discontinued_at,
        discontinued_price=item.discontinued_price,
        notes=item.notes,
    )


class DeleteItemRequest(BaseModel):
    id: int


@app.post("/item_track/delete_item", dependencies=dependencies)
async def delete_item(request: DeleteItemRequest):
    """
    软删除商品

    Args:
        id: 商品ID

    Returns:
        bool: 是否删除成功
    """
    return itemTrackManager.delete_item(request.id)


if __name__ == "__main__":
    import uvicorn

    uvicorn.run("main:app", host="0.0.0.0", port=7023, reload=settings.DEBUG)