import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { fireEvent, screen, waitFor } from "@testing-library/react";
import { describe, expect, it, vi } from "vitest";
import { LocationContactsFieldArray } from "@/app/(protected)/locations/_components/location-contacts-field-array";
import {
  locationDefaultValues,
  locationSchema,
  type LocationFormValues,
} from "@/domain/locations/schemas/location-schema";
import { renderWithProviders } from "@/test/test-utils";

const dataTransferStub = {
  setData: vi.fn(),
  effectAllowed: "none" as DataTransfer["effectAllowed"],
};

function ContactsHarness({
  initialContacts,
  onSubmit = vi.fn(),
}: {
  initialContacts: LocationFormValues["contacts"];
  onSubmit?: (values: LocationFormValues) => void;
}) {
  const {
    control,
    handleSubmit,
    register,
    formState: { errors },
  } = useForm<LocationFormValues>({
    resolver: zodResolver(locationSchema),
    defaultValues: {
      ...locationDefaultValues,
      name: "Dallas DC",
      address: "3811 Distribution Dr",
      city: "Dallas",
      state: "TX",
      zipCode: "70068",
      contactEmail: "jane@example.com",
      contacts: initialContacts,
    },
  });

  return (
    <form onSubmit={handleSubmit(onSubmit)} noValidate>
      <LocationContactsFieldArray control={control} errors={errors} register={register} />
      <button type="submit">Save</button>
    </form>
  );
}

function nameInputs(): HTMLInputElement[] {
  return screen.getAllByLabelText(/^Contact Name/) as HTMLInputElement[];
}

/** 1-based handle position: `handleFor(2)` is the second row's drag handle. */
function handleFor(position: number): HTMLElement {
  return screen.getByRole("button", {
    name: `Reorder contact ${position}. Use arrow up or down to move.`,
  });
}

describe("LocationContactsFieldArray", () => {
  it("marks the first row as Main and disables removal when only one remains", () => {
    renderWithProviders(
      <ContactsHarness initialContacts={[{ name: "Jane", phone: "(421) 433-0032" }]} />,
      { withAuth: false },
    );

    expect(screen.getByText("Main")).toBeInTheDocument();
    expect(screen.getByLabelText(/^Contact Name \(Main\)/)).toHaveValue("Jane");
    expect(screen.getByLabelText("Remove contact 1")).toBeDisabled();
  });

  it("adds and removes contact rows", () => {
    renderWithProviders(
      <ContactsHarness initialContacts={[{ name: "Jane", phone: "(421) 433-0032" }]} />,
      { withAuth: false },
    );

    fireEvent.click(screen.getByRole("button", { name: /add contact/i }));

    expect(nameInputs()).toHaveLength(2);
    expect(screen.getByLabelText("Remove contact 1")).toBeEnabled();
    expect(screen.getByText("Main")).toBeInTheDocument();

    fireEvent.click(screen.getByLabelText("Remove contact 2"));
    expect(nameInputs()).toHaveLength(1);
    expect(screen.getByLabelText("Remove contact 1")).toBeDisabled();
  });

  it("reorders with keyboard ArrowUp and keeps focus on the moved handle", async () => {
    renderWithProviders(
      <ContactsHarness
        initialContacts={[
          { id: 11, name: "Jane", phone: "(421) 433-0032" },
          { id: 12, name: "Bob", phone: "(421) 433-0033" },
        ]}
      />,
      { withAuth: false },
    );

    expect(nameInputs().map((input) => input.value)).toEqual(["Jane", "Bob"]);

    const bobHandle = handleFor(2);
    bobHandle.focus();
    fireEvent.keyDown(bobHandle, { key: "ArrowUp" });

    expect(nameInputs().map((input) => input.value)).toEqual(["Bob", "Jane"]);
    await waitFor(() => {
      expect(document.activeElement).toBe(handleFor(1));
    });
  });

  it("ignores ArrowDown on the last row", () => {
    renderWithProviders(
      <ContactsHarness
        initialContacts={[
          { name: "Jane", phone: "(421) 433-0032" },
          { name: "Bob", phone: "(421) 433-0033" },
        ]}
      />,
      { withAuth: false },
    );

    fireEvent.keyDown(handleFor(2), { key: "ArrowDown" });

    expect(nameInputs().map((input) => input.value)).toEqual(["Jane", "Bob"]);
  });

  it("reorders with native drag events from the handle", () => {
    renderWithProviders(
      <ContactsHarness
        initialContacts={[
          { name: "Jane", phone: "(421) 433-0032" },
          { name: "Bob", phone: "(421) 433-0033" },
        ]}
      />,
      { withAuth: false },
    );

    fireEvent.dragStart(handleFor(1), { dataTransfer: dataTransferStub });
    fireEvent.drop(nameInputs()[1].closest("div") as HTMLElement, {
      dataTransfer: dataTransferStub,
    });

    expect(nameInputs().map((input) => input.value)).toEqual(["Bob", "Jane"]);
  });

  it("submits contacts in displayed order", async () => {
    const onSubmit = vi.fn();
    renderWithProviders(
      <ContactsHarness
        initialContacts={[
          { id: 11, name: "Jane", phone: "(421) 433-0032" },
          { id: 12, name: "Bob", phone: "(421) 433-0033" },
        ]}
        onSubmit={onSubmit}
      />,
      { withAuth: false },
    );

    fireEvent.keyDown(handleFor(2), { key: "ArrowUp" });
    fireEvent.click(screen.getByRole("button", { name: "Save" }));

    await waitFor(() => {
      expect(onSubmit).toHaveBeenCalledTimes(1);
    });
    expect(onSubmit.mock.calls[0][0]).toEqual(
      expect.objectContaining({
        contacts: [
          { id: 12, name: "Bob", phone: "(421) 433-0033" },
          { id: 11, name: "Jane", phone: "(421) 433-0032" },
        ],
      }),
    );
  });
});