'use client';

import { useCallback } from 'react';
import { useForm, useWatch } from 'react-hook-form';
import { toast } from 'sonner';

import type { Tenant } from '@/types';

import { useSaveTenantMutation } from './useTenantMutations';

export interface TenantFormValues {
  id?: number;
  name: string;
  slug: string;
  client_id: string;
  plan_id: string;
  domain: string;
  description: string;
  admin_first_name: string;
  admin_last_name: string;
  admin_email: string;
  admin_phone_number: string;
}

const defaultValues: TenantFormValues = {
  name: '',
  slug: '',
  client_id: '',
  plan_id: '',
  domain: '',
  description: '',
  admin_first_name: '',
  admin_last_name: '',
  admin_email: '',
  admin_phone_number: '',
};

function createSlug(value: string) {
  return value
    .trim()
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}

function splitContactName(contactName: string) {
  const parts = contactName.trim().split(/\s+/).filter(Boolean);
  if (parts.length === 0) return { firstName: '', lastName: '' };
  if (parts.length === 1) return { firstName: parts[0], lastName: '' };
  return { firstName: parts[0], lastName: parts.slice(1).join(' ') };
}

export function useTenantForm({ onSaved }: { onSaved: () => void }) {
  const {
    register,
    handleSubmit: submitForm,
    reset,
    control,
    setValue,
    formState: { isSubmitting },
  } = useForm<TenantFormValues>({
    defaultValues,
  });
  const saveMutation = useSaveTenantMutation({
    onSaved: () => {
      reset(defaultValues);
      onSaved();
    },
  });

  const tenantId = useWatch({ control, name: 'id' });
  const clientId = useWatch({ control, name: 'client_id' }) || '';
  const planId = useWatch({ control, name: 'plan_id' }) || '';
  const adminEmail = useWatch({ control, name: 'admin_email' }) || '';
  const isEditMode = Boolean(tenantId);

  const handleSubmit = submitForm(
    (values) => {
      if (!values.client_id || !values.plan_id) {
        toast.error('Select a client and plan');
        return;
      }

      if (!isEditMode) {
        if (
          !values.admin_first_name.trim() ||
          !values.admin_last_name.trim() ||
          !values.admin_email.trim()
        ) {
          toast.error('Complete all required admin fields');
          return;
        }
      }

      saveMutation.mutate(values);
    },
    () => toast.error('Complete all required tenant fields'),
  );

  const openCreate = useCallback(() => {
    reset(defaultValues);
  }, [reset]);

  const openEdit = useCallback(
    (tenant: Tenant) => {
      reset({
        id: tenant.id,
        name: tenant.name || '',
        slug: tenant.slug || '',
        client_id: String(tenant.client_id ?? ''),
        plan_id: String(tenant.plan_id ?? ''),
        domain: tenant.domain || '',
        description: tenant.description || '',
        admin_first_name: '',
        admin_last_name: '',
        admin_email: tenant.admin_email || '',
        admin_phone_number: '',
      });
    },
    [reset],
  );

  const applyClientAdminDefaults = useCallback(
    (contactName: string, contactEmail: string, contactPhone: string) => {
      if (isEditMode) return;

      const { firstName, lastName } = splitContactName(contactName);
      setValue('admin_first_name', firstName, { shouldDirty: true });
      setValue('admin_last_name', lastName, { shouldDirty: true });
      setValue('admin_email', contactEmail, { shouldDirty: true });
      setValue('admin_phone_number', contactPhone, { shouldDirty: true });
    },
    [isEditMode, setValue],
  );

  const syncSlugFromName = useCallback(
    (name: string) => {
      if (isEditMode) return;
      setValue('slug', createSlug(name), { shouldDirty: true });
    },
    [isEditMode, setValue],
  );

  return {
    register,
    handleSubmit,
    reset,
    control,
    setValue,
    openCreate,
    openEdit,
    tenantId,
    clientId,
    planId,
    adminEmail,
    isEditMode,
    applyClientAdminDefaults,
    syncSlugFromName,
    isSaving: isSubmitting || saveMutation.isPending,
  };
}