import uuid
from functools import reduce
from typing import Optional

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

from ..schemas.auth import UserToken
import barker.schemas.master as schemas
from ..core.security import get_current_active_user as get_user
from ..db.session import SessionLocal
from ..models.master import ModifierCategory, MenuCategory, Product

router = APIRouter()


# Dependency
def get_db():
    try:
        db = SessionLocal()
        yield db
    finally:
        db.close()


@router.post("", response_model=schemas.ModifierCategory)
def save(
    data: schemas.ModifierCategoryIn,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["modifiers"]),
):
    try:
        item = ModifierCategory(name=data.name, minimum=data.minimum, maximum=data.maximum, is_active=data.is_active)
        db.add(item)
        add_products(item, data.menu_categories, db)
        db.commit()
        return modifier_category_info(item, db=db)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e),
        )
    except Exception:
        db.rollback()
        raise


@router.put("/{id_}", response_model=schemas.ModifierCategory)
def update(
    id_: uuid.UUID,
    data: schemas.ModifierCategoryIn,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["modifiers"]),
):
    try:
        item: ModifierCategory = db.query(ModifierCategory).filter(ModifierCategory.id == id_).first()
        item.name = data.name
        item.minimum = data.minimum
        item.maximum = data.maximum
        item.is_active = data.is_active
        add_products(item, data.menu_categories, db)
        db.commit()
        return modifier_category_info(item, db=db)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e),
        )
    except Exception:
        db.rollback()
        raise


@router.delete("/{id_}")
def delete(
    id_: uuid.UUID, db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["modifiers"]),
):
    try:
        item: ModifierCategory = db.query(ModifierCategory).filter(ModifierCategory.id == id_).first()
        db.delete(item)
        db.commit()
        return modifier_category_info(None, db=db)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e),
        )
    except Exception:
        db.rollback()
        raise


@router.get("")
def show_blank(
    db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["modifiers"]),
):
    return modifier_category_info(None, db=db)


@router.get("/list")
def show_list(db: Session = Depends(get_db), user: UserToken = Depends(get_user)):
    list_ = db.query(ModifierCategory).order_by(ModifierCategory.sort_order).order_by(ModifierCategory.name).all()
    menu_categories = (
        db.query(MenuCategory)
        .join(MenuCategory.products)
        .filter(Product.is_active == True)
        .order_by(MenuCategory.sort_order, Product.sort_order, Product.name)
        .all()
    )
    modifier_categories = []
    for item in list_:
        modifier_category = {
            "id": item.id,
            "name": item.name,
            "minimum": item.minimum,
            "maximum": item.maximum,
            "isActive": item.is_active,
            "menuCategories": [
                {
                    "id": mc.id,
                    "name": mc.name,
                    "enabled": reduce(lambda x, y: x and (y in item.products), mc.products, True),
                    "products": [{"id": p.id, "name": p.name} for p in mc.products if p in item.products],
                }
                for mc in menu_categories
            ],
        }
        modifier_category["menuCategories"] = [i for i in modifier_category["menuCategories"] if len(i["products"]) > 0]
        modifier_categories.append(modifier_category)
    return modifier_categories


@router.get("/for-product/{id_}")
def for_product(
    id_: uuid.UUID, db: Session = Depends(get_db), user: UserToken = Security(get_user),
):
    product: Product = db.query(Product).filter(Product.id == id_).first()

    return [
        {
            "id": item.id,
            "name": item.name,
            "minimum": item.minimum,
            "maximum": item.maximum,
            "isActive": item.is_active,
            "modifiers": [
                {"id": m.id, "name": m.name, "price": m.price} for m in item.modifiers if m.is_active == True
            ],
        }
        for item in product.modifier_categories
        if item.is_active == True
    ]


@router.get("/{id_}")
def show_id(
    id_: uuid.UUID, db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["modifiers"]),
):
    item: ModifierCategory = db.query(ModifierCategory).filter(ModifierCategory.id == id_).first()
    return modifier_category_info(item, db=db)


def modifier_category_info(item: Optional[ModifierCategory], db: Session):
    menu_categories = (
        db.query(MenuCategory)
        .join(MenuCategory.products)
        .filter(Product.is_active == True)
        .order_by(MenuCategory.sort_order, Product.sort_order, Product.name)
        .all()
    )
    if item is None:
        return {
            "name": "",
            "minimum": 0,
            "maximum": 0,
            "isActive": True,
            "menuCategories": [
                {
                    "id": mc.id,
                    "name": mc.name,
                    "enabled": False,
                    "products": [{"id": p.id, "name": p.name, "enabled": False} for p in mc.products],
                }
                for mc in menu_categories
            ],
            "sortOrder": item.sort_order,
        }
    return {
        "id": item.id,
        "name": item.name,
        "minimum": item.minimum,
        "maximum": item.maximum,
        "isActive": item.is_active,
        "menuCategories": [
            {
                "id": mc.id,
                "name": mc.name,
                "enabled": False,
                "products": [
                    {"id": p.id, "name": p.name, "enabled": True if p in item.products else False} for p in mc.products
                ],
            }
            for mc in menu_categories
        ],
        "sortOrder": item.sort_order,
    }


def add_products(modifier_category: ModifierCategory, menu_categories, db: Session):
    for mc in menu_categories:
        for p in mc.products:
            old = [x for x in modifier_category.products if x.id == p.id_]
            old = None if len(old) == 0 else old[0]
            if p.enabled and old is None:
                product_object = db.query(Product).filter(Product.id == p.id_).one()
                modifier_category.products.append(product_object)
            elif not p.enabled and old:
                modifier_category.products.remove(old)