import re
import uuid

from datetime import datetime, timedelta

from fastapi import APIRouter, HTTPException, Security, status
from sqlalchemy import and_, or_, select
from sqlalchemy.orm import Session, joinedload

from ...core.config import settings
from ...core.security import get_current_active_user as get_user
from ...db.session import SessionFuture
from ...models.bill import Bill
from ...models.food_table import FoodTable
from ...models.guest_book import GuestBook
from ...models.overview import Overview
from ...models.product_version import ProductVersion
from ...models.regime import Regime
from ...models.voucher import Voucher
from ...models.voucher_type import VoucherType
from ...schemas.user_token import UserToken


router = APIRouter()


@router.get("/from-id/{id_}")
def from_id(
    id_: str,
    user: UserToken = Security(get_user),
):
    with SessionFuture() as db:
        item: Voucher = db.execute(select(Voucher).where(Voucher.id == id_)).scalar_one()
        return voucher_info(item, db)


@router.get("/from-bill/{id_}")
def from_bill(
    id_: str,
    user: UserToken = Security(get_user),
):
    with SessionFuture() as db:
        match = re.compile(r"^(\w+)-(\d+)$").match(id_)
        if not match or len(match.groups()) != 2:
            raise HTTPException(
                status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
                detail="Bill Number is invalid",
            )
        voucher_id = (
            select(Bill.voucher_id)
            .join(Bill.regime)
            .where(Regime.prefix == match.group(1), Bill.bill_number == int(match.group(2)))
            .options(joinedload(Regime.prefix, innerjoin=True))
        )
        item = db.execute(select(Voucher).where(Voucher.id.in_(voucher_id))).scalars().one_or_none()
        if item is None:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="Bill not found",
            )
        return voucher_info(item, db)


@router.get("/from-table/{id_}")
def from_table(
    id_: str,  # table id
    v: uuid.UUID | None = None,  # voucher id
    g: uuid.UUID | None = None,  # guest id
    user: UserToken = Security(get_user),
):
    with SessionFuture() as db:
        guest = None if g is None else db.execute(select(GuestBook).where(GuestBook.id == g)).scalar_one()
        if v is not None:
            item = (
                db.execute(
                    select(Overview).where(
                        Overview.voucher_id == v,
                        Overview.food_table_id == id_,
                    )
                )
                .scalars()
                .one_or_none()
            )
            if item is None:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="Voucher not found",
                )
            else:
                if guest is not None:
                    item.voucher.customer = guest.customer
                return voucher_info(item.voucher, db)
        table = db.execute(select(FoodTable).where(FoodTable.id == id_)).scalar_one()
        return voucher_blank(table, guest)


def voucher_product(product_id: uuid.UUID, date_: datetime, is_happy_hour: bool, db: Session):
    product_date = (
        date_ + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES - settings.NEW_DAY_OFFSET_MINUTES)
    ).date()
    product: ProductVersion = db.execute(
        select(ProductVersion).where(
            and_(
                ProductVersion.product_id == product_id,
                or_(
                    ProductVersion.valid_from == None,  # noqa: E711
                    ProductVersion.valid_from <= product_date,
                ),
                or_(
                    ProductVersion.valid_till == None,  # noqa: E711
                    ProductVersion.valid_till >= product_date,
                ),
            )
        )
    ).scalar_one()

    return {
        "id": product_id,
        "name": ("H H " if is_happy_hour else "") + product.full_name,
        "menuCategory": {
            "id": product.menu_category_id,
            "name": product.menu_category.name,
        },
        "saleCategory": {
            "id": product.sale_category_id,
            "name": product.sale_category.name,
            "discountLimit": product.sale_category.discount_limit,
        },
    }


def voucher_info(item: Voucher, db: Session):
    return {
        "id": item.id,
        "date": (item.date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime("%H:%M"),
        "dateTip": (item.date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime("%d-%b-%Y %H:%M:%S"),
        "pax": item.pax,
        "user": {"id": item.user_id, "name": item.user.name},
        "creationDate": (item.creation_date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime("%H:%M"),
        "creationDateTip": (item.creation_date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime(
            "%d-%b-%Y %H:%M:%S"
        ),
        "lastEditDate": (item.last_edit_date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime("%H:%M"),
        "lastEditDateTip": (item.last_edit_date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime(
            "%d-%b-%Y %H:%M:%S"
        ),
        "kotId": item.kot_id,
        "billId": ", ".join(f"{x.regime.prefix}-{x.bill_number}" for x in item.bills),
        "table": {"id": item.food_table_id, "name": item.food_table.name},
        "customer": {"id": item.customer.id, "name": item.customer.name} if item.customer is not None else None,
        "narration": item.narration,
        "reason": item.reason,
        "voucherType": item.voucher_type,
        "kots": [
            {
                "id": k.id,
                "code": k.code,
                "date": (k.date + timedelta(minutes=settings.TIMEZONE_OFFSET_MINUTES)).strftime("%d-%b-%Y %H:%M:%S"),
                "user": {"id": k.user_id, "name": k.user.name},
                "inventories": [
                    {
                        "id": i.id,
                        "sortOrder": i.sort_order,
                        "product": voucher_product(i.product_id, item.date, i.is_happy_hour, db),
                        "quantity": i.quantity,
                        "price": i.price,
                        "isHappyHour": i.is_happy_hour,
                        "taxRate": i.tax_rate,
                        "tax": {"id": i.tax_id, "name": i.tax.name},
                        "discount": i.discount,
                        "modifiers": [
                            {
                                "id": m.modifier.id,
                                "name": m.modifier.name,
                                "price": m.price,
                            }
                            for m in i.modifiers
                        ],
                    }
                    for i in k.inventories
                ],
            }
            for k in item.kots
        ],
    }


def voucher_blank(table: FoodTable, guest: GuestBook | None):
    return {
        "pax": table.seats if guest is None else guest.pax,
        "table": {"id": table.id, "name": table.name},
        "voucherType": VoucherType.KOT,
        "customer": {"id": guest.customer_id, "name": guest.customer.name} if guest is not None else None,
        "kots": [],
    }