"""Tenant service: CRUD operations for tenants."""
from sqlalchemy.orm import Session
from typing import List, Optional
from app.models.tenant import Tenant
from app.schemas.tenant import TenantCreate, TenantUpdate, TenantResponse


class TenantService:
    @staticmethod
    def list_tenants(db: Session, skip: int = 0, limit: int = 100) -> List[Tenant]:
        return db.query(Tenant).offset(skip).limit(limit).all()

    @staticmethod
    def get_tenant(db: Session, tenant_id: int) -> Optional[Tenant]:
        return db.query(Tenant).filter(Tenant.id == tenant_id).first()

    @staticmethod
    def create_tenant(db: Session, req: TenantCreate) -> Tenant:
        # Check slug uniqueness
        existing = db.query(Tenant).filter(Tenant.slug == req.slug).first()
        if existing:
            raise ValueError(f"Tenant slug '{req.slug}' already exists")
        tenant = Tenant(
            name=req.name,
            slug=req.slug,
            description=req.description,
        )
        db.add(tenant)
        db.commit()
        db.refresh(tenant)
        return tenant

    @staticmethod
    def update_tenant(db: Session, tenant_id: int, req: TenantUpdate) -> Tenant:
        tenant = db.query(Tenant).filter(Tenant.id == tenant_id).first()
        if not tenant:
            raise ValueError(f"Tenant #{tenant_id} not found")
        for field, value in req.model_dump(exclude_unset=True).items():
            setattr(tenant, field, value)
        db.commit()
        db.refresh(tenant)
        return tenant

    @staticmethod
    def delete_tenant(db: Session, tenant_id: int) -> bool:
        tenant = db.query(Tenant).filter(Tenant.id == tenant_id).first()
        if not tenant:
            return False
        db.delete(tenant)
        db.commit()
        return True