"""Customer routes (tenant management)."""

from fastapi import APIRouter, Depends, Request
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import client_ip, get_current_user
from app.core.database import get_db
from app.core.exceptions import ConflictError, NotFoundError
from app.models.customer import Customer
from app.models.user import User
from app.schemas.customer import CustomerCreate, CustomerRead, CustomerUpdate
from app.services.audit import AuditService

router = APIRouter()


@router.get("", response_model=list[CustomerRead])
async def list_customers(
    db: AsyncSession = Depends(get_db),
    _user: User = Depends(get_current_user),
) -> list[Customer]:
    result = await db.execute(select(Customer).order_by(Customer.name))
    return list(result.scalars().all())


@router.post("", response_model=CustomerRead, status_code=201)
async def create_customer(
    payload: CustomerCreate,
    request: Request,
    db: AsyncSession = Depends(get_db),
    user: User = Depends(get_current_user),
) -> Customer:
    existing = await db.execute(
        select(Customer).where((Customer.name == payload.name) | (Customer.slug == payload.slug))
    )
    if existing.scalar_one_or_none():
        raise ConflictError("Kunde mit diesem Namen oder Slug existiert bereits")

    customer = Customer(**payload.model_dump())
    db.add(customer)
    await db.flush()
    await AuditService(db).log(
        username=user.username,
        action="customer.create",
        target=customer.name,
        customer_id=customer.id,
        ip_address=client_ip(request),
    )
    return customer


@router.get("/{customer_id}", response_model=CustomerRead)
async def get_customer(
    customer_id: int,
    db: AsyncSession = Depends(get_db),
    _user: User = Depends(get_current_user),
) -> Customer:
    customer = await db.get(Customer, customer_id)
    if not customer:
        raise NotFoundError("Kunde nicht gefunden")
    return customer


@router.patch("/{customer_id}", response_model=CustomerRead)
async def update_customer(
    customer_id: int,
    payload: CustomerUpdate,
    request: Request,
    db: AsyncSession = Depends(get_db),
    user: User = Depends(get_current_user),
) -> Customer:
    customer = await db.get(Customer, customer_id)
    if not customer:
        raise NotFoundError("Kunde nicht gefunden")
    for field, value in payload.model_dump(exclude_unset=True).items():
        setattr(customer, field, value)
    await AuditService(db).log(
        username=user.username,
        action="customer.update",
        target=customer.name,
        customer_id=customer.id,
        ip_address=client_ip(request),
    )
    return customer


@router.delete("/{customer_id}", status_code=204)
async def delete_customer(
    customer_id: int,
    request: Request,
    db: AsyncSession = Depends(get_db),
    user: User = Depends(get_current_user),
) -> None:
    customer = await db.get(Customer, customer_id)
    if not customer:
        raise NotFoundError("Kunde nicht gefunden")
    await AuditService(db).log(
        username=user.username,
        action="customer.delete",
        target=customer.name,
        customer_id=customer.id,
        ip_address=client_ip(request),
    )
    await db.delete(customer)