import uuid

from datetime import date, datetime
from decimal import Decimal
from typing import List, Optional

from pydantic import validator
from pydantic.main import BaseModel

from . import to_camel
from .cost_centre import CostCentreLink
from .product import ProductLink
from .user_link import UserLink


class ClosingStockItem(BaseModel):
    id_: Optional[uuid.UUID]
    product: ProductLink
    group: str
    quantity: Decimal
    amount: Decimal
    physical: Decimal
    cost_centre: Optional[CostCentreLink]

    class Config:
        anystr_strip_whitespace = True
        alias_generator = to_camel


class ClosingStock(BaseModel):
    date_: date
    cost_centre: Optional[CostCentreLink]
    items: List[ClosingStockItem]
    creation_date: Optional[datetime]
    last_edit_date: Optional[datetime]
    user: Optional[UserLink]
    posted: bool
    poster: Optional[UserLink]

    class Config:
        anystr_strip_whitespace = True
        alias_generator = to_camel
        json_encoders = {date: lambda v: v.strftime("%d-%b-%Y"), datetime: lambda v: v.strftime("%d-%b-%Y %H:%M")}

    @validator("date_", pre=True)
    def parse_date(cls, value):
        if isinstance(value, date):
            return value
        return datetime.strptime(value, "%d-%b-%Y").date()

    @validator("creation_date", pre=True)
    def parse_creation_date(cls, value):
        if value is None:
            return None
        if isinstance(value, datetime):
            return value
        return datetime.strptime(value, "%d-%b-%Y %H:%M")

    @validator("last_edit_date", pre=True)
    def parse_last_edit_date(cls, value):
        if value is None:
            return None
        if isinstance(value, datetime):
            return value
        return datetime.strptime(value, "%d-%b-%Y %H:%M")