import uuid

from typing import List

import barker.schemas.customer as schemas

from fastapi import APIRouter, Depends, HTTPException, Security, status
from sqlalchemy import delete, or_, select
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.orm import Session

from ..core.security import get_current_active_user as get_user
from ..db.session import SessionFuture
from ..models.customer import Customer
from ..models.customer_discount import CustomerDiscount
from ..models.sale_category import SaleCategory
from ..schemas.user_token import UserToken


router = APIRouter()


@router.post("", response_model=schemas.Customer)
def save(
    data: schemas.CustomerIn,
    user: UserToken = Security(get_user, scopes=["customers"]),
) -> schemas.Customer:
    try:
        with SessionFuture() as db:
            item = Customer(name=data.name, phone=data.phone, address=data.address, print_in_bill=data.print_in_bill)
            db.add(item)
            add_discounts(item, data.discounts, db)
            db.commit()
            sc: List[SaleCategory] = db.execute(select(SaleCategory).order_by(SaleCategory.name)).scalars().all()
            return customer_info(item, sc)
    except SQLAlchemyError as e:
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e),
        )


@router.put("/{id_}", response_model=schemas.Customer)
def update_route(
    id_: uuid.UUID,
    data: schemas.CustomerIn,
    user: UserToken = Security(get_user, scopes=["customers"]),
) -> schemas.Customer:
    try:
        with SessionFuture() as db:
            item: Customer = db.execute(select(Customer).where(Customer.id == id_)).scalar_one()
            item.name = data.name
            item.phone = data.phone
            item.address = data.address
            item.print_in_bill = data.print_in_bill
            add_discounts(item, data.discounts, db)
            db.commit()
            sc: List[SaleCategory] = db.execute(select(SaleCategory).order_by(SaleCategory.name)).scalars().all()
            return customer_info(item, sc)
    except SQLAlchemyError as e:
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e),
        )


def add_discounts(customer: Customer, discounts: List[schemas.DiscountItem], db: Session) -> None:
    for discount in discounts:
        cd = next((d for d in customer.discounts if d.sale_category_id == discount.id_), None)
        if cd is None:
            cd = CustomerDiscount(discount.id_, round(discount.discount, 5), customer=customer)
            customer.discounts.append(cd)
            db.add(cd)
        else:
            cd.discount = round(discount.discount, 5)


@router.delete("/{id_}")
def delete_route(
    id_: uuid.UUID,
    user: UserToken = Security(get_user, scopes=["customers"]),
) -> None:
    with SessionFuture() as db:
        db.execute(delete(CustomerDiscount).where(CustomerDiscount.customer_id == id_))
        db.execute(delete(Customer).where(Customer.id == id_))
        db.commit()


@router.get("", response_model=schemas.CustomerBlank)
def show_blank(
    user: UserToken = Security(get_user, scopes=["customers"]),
) -> schemas.CustomerBlank:
    with SessionFuture() as db:
        sc: List[SaleCategory] = db.execute(select(SaleCategory).order_by(SaleCategory.name)).scalars().all()
        return blank_customer_info(sc)


@router.get("/list", response_model=List[schemas.Customer])
def show_list(user: UserToken = Depends(get_user)) -> List[schemas.Customer]:
    with SessionFuture() as db:
        sc: List[SaleCategory] = db.execute(select(SaleCategory).order_by(SaleCategory.name)).scalars().all()
        return [
            customer_info(item, sc) for item in db.execute(select(Customer).order_by(Customer.name)).scalars().all()
        ]


@router.get("/query", response_model=List[schemas.Customer])
def show_term(
    q: str,
    current_user: UserToken = Depends(get_user),
) -> List[schemas.Customer]:
    query = select(Customer)
    if q is not None:
        for item in q.split():
            query = query.where(or_(Customer.name.ilike(f"%{item}%"), Customer.phone.ilike(f"%{item}%")))

    query = query.order_by(Customer.name)
    with SessionFuture() as db:
        sc: List[SaleCategory] = db.execute(select(SaleCategory).order_by(SaleCategory.name)).scalars().all()
        return [customer_info(item, sc) for item in db.execute(query).scalars().all()]


@router.get("/{id_}", response_model=schemas.Customer)
def show_id(
    id_: uuid.UUID,
    user: UserToken = Security(get_user, scopes=["customers"]),
) -> schemas.Customer:
    with SessionFuture() as db:
        sc: List[SaleCategory] = db.execute(select(SaleCategory).order_by(SaleCategory.name)).scalars().all()
        item: Customer = db.execute(select(Customer).where(Customer.id == id_)).scalar_one()
        return customer_info(item, sc)


def customer_info(item: Customer, sale_categories: List[SaleCategory]) -> schemas.Customer:
    return schemas.Customer(
        id=item.id,
        name=item.name,
        address=item.address,
        phone=item.phone,
        printInBill=item.print_in_bill,
        discounts=[
            {
                "id": sc.id,
                "name": sc.name,
                "discount": next((d.discount for d in item.discounts if d.sale_category_id == sc.id), 0),
            }
            for sc in sale_categories
        ],
    )


def blank_customer_info(sale_categories: List[SaleCategory]) -> schemas.CustomerBlank:
    return schemas.CustomerBlank(
        name="",
        address="",
        phone="",
        printInBill=False,
        discounts=[
            {
                "id": sc.id,
                "name": sc.name,
                "discount": 0,
            }
            for sc in sale_categories
        ],
    )