// useImportWizard — the folder read at mount marks itself done (#384, #398).
//
// No renderer in this project, and the reducer alone cannot reach the mount
// read: it is an effect of the hook. React's hooks used by `useImportWizard`
// are stubbed (technique of useImportWizard.executeImport.test.ts): the hook
// runs as a plain function, its effect is captured and run by hand, and the
// services it calls are mocked. What is pinned here is the `finally`: the
// folder counts as read once the read and its scan are over, success or not.

import { describe, it, expect, vi, beforeEach } from "vitest";

const harness = vi.hoisted(() => ({
  state: null as unknown,
  dispatch: vi.fn(),
  effects: [] as Array<() => void>,
}));

vi.mock("react", async (importOriginal) => {
  const actual = await importOriginal<typeof import("react")>();
  return {
    ...actual,
    useReducer: () => [harness.state, harness.dispatch],
    useCallback: (fn: unknown) => fn,
    useEffect: (fn: () => void) => {
      harness.effects.push(fn);
    },
  };
});

vi.mock("@tauri-apps/api/core", () => ({ invoke: vi.fn() }));
vi.mock("../services/db", () => ({ getDb: vi.fn(), withTransaction: vi.fn() }));
vi.mock("../services/userPreferenceService", () => ({
  getImportFolder: vi.fn(),
  setImportFolder: vi.fn(),
}));
vi.mock("../services/importSourceService", () => ({
  getAllSources: vi.fn(async () => []),
  getSourceByName: vi.fn(async () => null),
  createSource: vi.fn(),
  updateSource: vi.fn(),
}));
vi.mock("../services/importedFileService", () => ({
  existsByHash: vi.fn(),
  createImportedFile: vi.fn(),
  updateFileStatus: vi.fn(),
  getFilesBySourceId: vi.fn(async () => []),
}));
vi.mock("../services/importConfigTemplateService", () => ({
  getAllTemplates: vi.fn(async () => []),
  createTemplate: vi.fn(),
  updateTemplate: vi.fn(),
  deleteTemplate: vi.fn(),
}));

import { invoke } from "@tauri-apps/api/core";
import { useImportWizard, initialWizardState } from "./useImportWizard";
import { getImportFolder } from "../services/userPreferenceService";
import type { ScannedSource } from "../shared/types";

const SOURCES: ScannedSource[] = [
  { folder_name: "Desjardins", folder_path: "/releves/Desjardins", files: [] },
];

/** Lets the mount read's promises settle. */
const flush = async () => {
  for (let i = 0; i < 20; i++) await Promise.resolve();
};

/** Mounts the hook and runs its mount effect, the first one it registers. */
async function mount() {
  useImportWizard();
  const [readFolder] = harness.effects;
  readFolder();
  await flush();
}

const types = () => harness.dispatch.mock.calls.map((c) => (c[0] as { type: string }).type);

beforeEach(() => {
  harness.state = initialWizardState;
  harness.effects = [];
  harness.dispatch.mockReset();
  vi.mocked(getImportFolder).mockReset();
  vi.mocked(invoke).mockReset();
});

describe("useImportWizard — the mount read marks the folder read (#384, #398)", () => {
  it("with a folder: after the folder and its first scan, as the last dispatch", async () => {
    vi.mocked(getImportFolder).mockResolvedValue("/releves");
    vi.mocked(invoke).mockResolvedValue(SOURCES);
    await mount();

    expect(invoke).toHaveBeenCalledWith("scan_import_folder", { folderPath: "/releves" });
    const order = types();
    expect(order[0]).toBe("SET_IMPORT_FOLDER");
    expect(order.indexOf("SET_SCANNED_SOURCES")).toBeGreaterThan(0);
    expect(order[order.length - 1]).toBe("SET_IMPORT_FOLDER_LOADED");
    expect(order.filter((t) => t === "SET_IMPORT_FOLDER_LOADED")).toHaveLength(1);
  });

  it("without a folder: marked read, nothing scanned", async () => {
    vi.mocked(getImportFolder).mockResolvedValue(null);
    await mount();

    expect(invoke).not.toHaveBeenCalled();
    expect(harness.dispatch.mock.calls.map((c) => c[0])).toEqual([
      { type: "SET_IMPORT_FOLDER", payload: null },
      { type: "SET_IMPORT_FOLDER_LOADED" },
    ]);
  });

  it("when the preference cannot be read: still marked read (the empty state then offers a folder)", async () => {
    vi.mocked(getImportFolder).mockRejectedValue(new Error("database is locked"));
    await mount();

    expect(types()).toEqual(["SET_IMPORT_FOLDER_LOADED"]);
  });

  it("when the scan fails: marked read after the error", async () => {
    vi.mocked(getImportFolder).mockResolvedValue("/releves");
    vi.mocked(invoke).mockRejectedValue(new Error("folder not found"));
    await mount();

    const order = types();
    expect(order).toContain("SET_ERROR");
    expect(order[order.length - 1]).toBe("SET_IMPORT_FOLDER_LOADED");
  });
});