import { useMutation, useQueryClient } from "@tanstack/react-query";
import { useNavigate } from "react-router";
import { toast } from "react-toastify";

import { vendorOperationsApi } from "@/domain/vendor-operations/api/vendor-operations-api";
import type {
  VendorAssignmentPayload,
  VendorAssignmentResult,
} from "@/domain/vendor-operations/types/vendor-operations";
import { workOrdersApi } from "@/domain/work-orders/api/work-orders-api";
import type { WorkOrderFormSchemaValues } from "@/domain/work-orders/schemas/work-order-schema";
import { queryKeys } from "@/infra/query-key/query-key";

type SaveWorkOrderInput = {
  workOrderId?: string | number;
  values: WorkOrderFormSchemaValues;
  vendorAssignment?: VendorAssignmentPayload;
};

type SaveWorkOrderResult = {
  workOrderId: string | number;
  assignment?: VendorAssignmentResult;
};

class PartialWorkOrderSaveError extends Error {
  constructor(public readonly workOrderId: string | number) {
    super("Work order saved, but the vendor assignment could not be completed.");
    this.name = "PartialWorkOrderSaveError";
  }
}

export function useSaveWorkOrder() {
  const navigate = useNavigate();
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: async ({
      workOrderId,
      values,
      vendorAssignment,
    }: SaveWorkOrderInput): Promise<SaveWorkOrderResult> => {
      const savedWorkOrder = workOrderId
        ? await workOrdersApi.update(workOrderId, values)
        : await workOrdersApi.create(values);

      let assignment: VendorAssignmentResult | undefined;
      if (vendorAssignment) {
        try {
          assignment = await vendorOperationsApi.assignVendor(savedWorkOrder.id, vendorAssignment);
        } catch {
          throw new PartialWorkOrderSaveError(savedWorkOrder.id);
        }
      }

      return { workOrderId: savedWorkOrder.id, assignment };
    },
    onSuccess: ({ workOrderId, assignment }) => {
      void queryClient.invalidateQueries({ queryKey: queryKeys.workOrders.all });
      void queryClient.invalidateQueries({
        queryKey: queryKeys.workOrders.detail(workOrderId),
      });
      toast.success("Work order saved successfully");
      if (assignment?.conflicts.length) {
        const count = assignment.conflicts.length;
        toast.warning(`Vendor assigned with ${count} scheduling conflict${count > 1 ? "s" : ""}.`);
      }
      navigate(`/workorders/${workOrderId}`);
    },
    onError: (error) => {
      if (error instanceof PartialWorkOrderSaveError) {
        void queryClient.invalidateQueries({ queryKey: queryKeys.workOrders.all });
        void queryClient.invalidateQueries({
          queryKey: queryKeys.workOrders.detail(error.workOrderId),
        });
        toast.error(error.message);
        navigate(`/workorders/${error.workOrderId}`);
        return;
      }

      toast.error("Unable to save the work order. Please try again.");
    },
  });
}