import { createContext, useContext } from 'react';
import {
  RequestContext,
  createRequestContext,
  getActiveGlobalTenantId,
  setActiveGlobalTenantId,
} from '../../services/contracts/context';

export interface TenantInfo {
  id: string;
  name: string;
  description?: string;
}

export const PRESET_TENANTS: TenantInfo[] = [
  { id: 'tenant_main', name: 'Основной бизнес (Main)', description: 'Главный тенант компании' },
  { id: 'tenant_alpha', name: 'Филиал «Север» (Alpha)', description: 'Северное подразделение' },
  { id: 'tenant_beta', name: 'Филиал «Юг» (Beta)', description: 'Южное подразделение' },
  { id: 'tenant_demo', name: 'Песочница (Demo/Sandbox)', description: 'Тестовая изолированная среда' },
];

export interface TenantContextValue {
  currentTenantId: string;
  currentTenant: TenantInfo;
  availableTenants: TenantInfo[];
  requestContext: RequestContext;
  switchTenant: (tenantId: string) => void;
  createContextForCurrentTenant: (overrides?: Partial<RequestContext>) => RequestContext;
}

export const TenantContext = createContext<TenantContextValue | null>(null);

export function useTenant(): TenantContextValue {
  const ctx = useContext(TenantContext);
  if (!ctx) {
    const fallbackTenantId = getActiveGlobalTenantId();
    const currentTenant = PRESET_TENANTS.find((t) => t.id === fallbackTenantId) || {
      id: fallbackTenantId,
      name: fallbackTenantId,
    };
    return {
      currentTenantId: fallbackTenantId,
      currentTenant,
      availableTenants: PRESET_TENANTS,
      requestContext: createRequestContext({ tenantId: fallbackTenantId }),
      switchTenant: setActiveGlobalTenantId,
      createContextForCurrentTenant: (overrides) =>
        createRequestContext({ tenantId: fallbackTenantId, ...overrides }),
    };
  }
  return ctx;
}