"""Кассы Checkbox. Только администратор; секреты — только на запись."""

from __future__ import annotations

import uuid

from fastapi import APIRouter, Depends, HTTPException, Request, status
from sqlalchemy import select, update

from app.api.deps import AdminUser, CheckboxClientDep, SessionDep, require_admin
from app.core import crypto
from app.db.models.audit import AuditAction
from app.db.models.cash_register import CashRegister
from app.schemas.receipts import CashRegisterCreate, CashRegisterOut, CashRegisterUpdate
from app.services import audit
from app.services.checkbox.client import CheckboxError
from app.services.receipts import credentials

router = APIRouter(
    prefix="/cash-registers", tags=["cash-registers"], dependencies=[Depends(require_admin)]
)


async def _clear_default(session: SessionDep, keep_id: uuid.UUID) -> None:
    await session.execute(
        update(CashRegister).where(CashRegister.id != keep_id).values(is_default=False)
    )


@router.get("", response_model=list[CashRegisterOut])
async def list_cash_registers(session: SessionDep) -> list[CashRegisterOut]:
    registers = await session.scalars(select(CashRegister).order_by(CashRegister.created_at))
    return [CashRegisterOut.from_register(register) for register in registers]


@router.post("", response_model=CashRegisterOut, status_code=status.HTTP_201_CREATED)
async def create_cash_register(
    payload: CashRegisterCreate, request: Request, session: SessionDep, actor: AdminUser
) -> CashRegisterOut:
    register = CashRegister(
        id=uuid.uuid4(),
        name=payload.name,
        fiscal_number=payload.fiscal_number,
        license_key_enc=crypto.encrypt(payload.license_key),
        cashier_pin_enc=crypto.encrypt(payload.pin_code),
        tax_codes=payload.tax_codes,
        is_active=True,
        is_default=payload.is_default,
    )
    if register.is_default:
        await _clear_default(session, register.id)
    session.add(register)
    await audit.record(
        session,
        action=AuditAction.CASH_REGISTER_CREATED,
        user=actor,
        entity_type="cash_register",
        entity_id=register.id,
        payload={"name": register.name, "fiscal_number": register.fiscal_number},
        request=request,
    )
    await session.commit()
    return CashRegisterOut.from_register(register)


@router.patch("/{register_id}", response_model=CashRegisterOut)
async def update_cash_register(
    register_id: uuid.UUID,
    payload: CashRegisterUpdate,
    request: Request,
    session: SessionDep,
    actor: AdminUser,
) -> CashRegisterOut:
    register = await session.get(CashRegister, register_id)
    if register is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Касса не найдена")

    changes = payload.model_dump(exclude_unset=True)
    if "license_key" in changes:
        register.license_key_enc = crypto.encrypt(changes["license_key"])
    if "pin_code" in changes:
        register.cashier_pin_enc = crypto.encrypt(changes["pin_code"])
    if "fiscal_number" in changes:
        register.fiscal_number = changes["fiscal_number"]
    for field in ("name", "tax_codes", "is_active", "is_default"):
        if changes.get(field) is not None:
            setattr(register, field, changes[field])
    if changes.get("is_default"):
        await _clear_default(session, register.id)

    await audit.record(
        session,
        action=AuditAction.CASH_REGISTER_UPDATED,
        user=actor,
        entity_type="cash_register",
        entity_id=register.id,
        payload=changes,  # license_key / pin_code редактируются в audit._sanitize
        request=request,
    )
    await session.commit()
    return CashRegisterOut.from_register(register)


@router.post("/{register_id}/check", status_code=status.HTTP_204_NO_CONTENT)
async def check_cash_register(
    register_id: uuid.UUID, session: SessionDep, checkbox: CheckboxClientDep
) -> None:
    """Пробный вход кассира в Checkbox — проверка ключа лицензии и PIN."""
    register = await session.get(CashRegister, register_id)
    if register is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Касса не найдена")
    try:
        await checkbox.sign_in(credentials(register))
    except (CheckboxError, crypto.DecryptionError) as exc:
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY, detail=f"Checkbox: {exc}"
        ) from exc