import { useState } from "react";
import { useDeleteVendor } from "@/domain/vendors/use-cases/use-delete-vendor";
import { useVendorDeactivationImpact } from "@/domain/vendors/use-cases/use-vendor-deactivation-impact";
import type { VendorDeactivationImpact, VendorListItem } from "@/domain/vendors/types/vendor";

export interface VendorDeactivationState {
  target: VendorListItem | null;
  error: string | null;
  impact: VendorDeactivationImpact | undefined;
  isLoading: boolean;
  impactError: Error | null;
  isSaving: boolean;
  open: (row: VendorListItem) => void;
  close: () => void;
  confirm: () => void;
}

export function useVendorDeactivation(onSuccess?: () => void): VendorDeactivationState {
  const [target, setTarget] = useState<VendorListItem | null>(null);
  const [error, setError] = useState<string | null>(null);
  const deleteVendor = useDeleteVendor();
  const {
    data: impact,
    isLoading,
    error: impactError,
  } = useVendorDeactivationImpact(target?.id ?? undefined);

  const open = (row: VendorListItem) => {
    setTarget(row);
    setError(null);
  };

  const close = () => {
    setTarget(null);
    setError(null);
  };

  const confirm = () => {
    if (!target || target.id == null) return;
    setError(null);
    // The dialog has shown whatever open work orders exist, so confirming here is
    // the explicit confirmation the API requires to deactivate past them (SH-254).
    deleteVendor.mutate(
      { id: target.id, confirmOpenWorkOrders: (impact?.openWorkOrders.length ?? 0) > 0 },
      {
        onSuccess: () => {
          setTarget(null);
          onSuccess?.();
        },
        onError: (err: Error) => setError(err.message || "Failed to deactivate vendor"),
      },
    );
  };

  return {
    target,
    error,
    impact,
    isLoading,
    impactError,
    isSaving: deleteVendor.isPending,
    open,
    close,
    confirm,
  };
}