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

const capabilitiesMock = vi.hoisted(() => vi.fn());
const downloadFileMock = vi.hoisted(() => vi.fn());
const openFileMock = vi.hoisted(() => vi.fn());
const pickFilesMock = vi.hoisted(() => vi.fn());
const saveFileMock = vi.hoisted(() => vi.fn());
const messageInfoMock = vi.hoisted(() => vi.fn());
const messageSuccessMock = vi.hoisted(() => vi.fn());
const finishActivityMock = vi.hoisted(() => vi.fn());
const startActivityMock = vi.hoisted(() => vi.fn());
const updateActivityMock = vi.hoisted(() => vi.fn());

vi.mock("../runtime", () => ({
  clientRuntime: {
    capabilities: capabilitiesMock,
  },
  downloadFile: downloadFileMock,
  openFile: openFileMock,
  pickFiles: pickFilesMock,
  saveFile: saveFileMock,
}));

vi.mock("element-plus", () => ({
  ElMessage: {
    info: messageInfoMock,
    success: messageSuccessMock,
  },
}));

vi.mock("../session/desktopActivityCenter", () => ({
  finishDesktopActivity: finishActivityMock,
  startDesktopActivity: startActivityMock,
  updateDesktopActivity: updateActivityMock,
}));

const output = {
  suggestedName: "report.pdf",
  mimeType: "application/pdf",
  data: new Blob(["content"], { type: "application/pdf" }),
};

describe("file task feedback", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    capabilitiesMock.mockReturnValue({ nativeFiles: false });
    pickFilesMock.mockResolvedValue([]);
    saveFileMock.mockResolvedValue("saved");
    openFileMock.mockResolvedValue(undefined);
    downloadFileMock.mockResolvedValue(undefined);
    startActivityMock.mockReturnValue("activity-1");
  });

  it("reports native file picker selections", async () => {
    const files = [
      new File(["a"], "a.txt", { type: "text/plain" }),
      new File(["b"], "b.txt", { type: "text/plain" }),
    ];
    pickFilesMock.mockResolvedValue(files);
    const { pickFilesWithFeedback } = await import("./fileTaskFeedback");

    const selected = await pickFilesWithFeedback({ multiple: true, title: "附件" });

    expect(selected).toBe(files);
    expect(pickFilesMock).toHaveBeenCalledWith({ multiple: true, title: "附件" });
    expect(messageSuccessMock).toHaveBeenCalledWith("已选择 2 个文件");
  });

  it("does not show a selection toast when the picker is cancelled", async () => {
    const { pickFilesWithFeedback } = await import("./fileTaskFeedback");

    await expect(pickFilesWithFeedback({ multiple: true })).resolves.toEqual([]);

    expect(messageSuccessMock).not.toHaveBeenCalled();
  });

  it("uses download feedback for web save flows", async () => {
    const { saveFileWithFeedback } = await import("./fileTaskFeedback");

    await expect(saveFileWithFeedback(output)).resolves.toBe("saved");

    expect(saveFileMock).toHaveBeenCalledWith(output);
    expect(messageSuccessMock).toHaveBeenCalledWith("文件下载已开始");
  });

  it("downloads directly without invoking the save flow", async () => {
    const { downloadFileWithFeedback } = await import("./fileTaskFeedback");

    await downloadFileWithFeedback(output);

    expect(downloadFileMock).toHaveBeenCalledWith(output);
    expect(saveFileMock).not.toHaveBeenCalled();
    expect(messageSuccessMock).toHaveBeenCalledWith("文件下载已开始");
  });

  it("reports direct downloads through persistent desktop activity", async () => {
    capabilitiesMock.mockReturnValue({ nativeFiles: true });
    const { downloadFileWithFeedback } = await import("./fileTaskFeedback");

    await downloadFileWithFeedback(output, { title: "下载 report.pdf" });

    expect(downloadFileMock).toHaveBeenCalledWith(output);
    expect(saveFileMock).not.toHaveBeenCalled();
    expect(startActivityMock).toHaveBeenCalledWith({
      kind: "download",
      title: "下载 report.pdf",
      detail: "正在准备下载",
    });
    expect(finishActivityMock).toHaveBeenCalledWith("activity-1", "completed", { detail: "文件下载已开始" });
  });

  it("writes to a destination that was selected before the download", async () => {
    const destination = { kind: "web-file-handle", handle: { createWritable: vi.fn() } } as const;
    const { saveFileWithFeedback } = await import("./fileTaskFeedback");

    await expect(saveFileWithFeedback(output, {}, destination)).resolves.toBe("saved");

    expect(saveFileMock).toHaveBeenCalledWith(output, destination);
    expect(messageSuccessMock).toHaveBeenCalledWith("文件已保存");
  });

  it("uses persistent desktop activity for native save flows", async () => {
    capabilitiesMock.mockReturnValue({ nativeFiles: true });
    const { saveFileWithFeedback } = await import("./fileTaskFeedback");

    await expect(saveFileWithFeedback(output)).resolves.toBe("saved");

    expect(startActivityMock).toHaveBeenCalledWith({
      kind: "download",
      title: "保存文件",
      detail: "等待选择保存位置",
    });
    expect(updateActivityMock).toHaveBeenCalledWith("activity-1", {
      detail: "等待选择保存位置",
      progress: 70,
    });
    expect(finishActivityMock).toHaveBeenCalledWith("activity-1", "completed", { detail: "文件已保存" });
    expect(messageSuccessMock).not.toHaveBeenCalled();
  });

  it("reports cancelled web save flows without treating them as downloads", async () => {
    saveFileMock.mockResolvedValue("cancelled");
    const { saveFileWithFeedback } = await import("./fileTaskFeedback");

    await expect(saveFileWithFeedback(output)).resolves.toBe("cancelled");

    expect(messageInfoMock).toHaveBeenCalledWith("已取消保存文件");
    expect(messageSuccessMock).not.toHaveBeenCalled();
  });

  it("reports cancelled native save flows through desktop activity", async () => {
    capabilitiesMock.mockReturnValue({ nativeFiles: true });
    saveFileMock.mockResolvedValue("cancelled");
    const { saveFileWithFeedback } = await import("./fileTaskFeedback");

    await expect(saveFileWithFeedback(output)).resolves.toBe("cancelled");

    expect(finishActivityMock).toHaveBeenCalledWith("activity-1", "cancelled", { detail: "已取消保存" });
    expect(messageInfoMock).not.toHaveBeenCalled();
  });

  it("reports external open completion", async () => {
    const { openFileWithFeedback } = await import("./fileTaskFeedback");

    await openFileWithFeedback(output);

    expect(openFileMock).toHaveBeenCalledWith(output);
    expect(messageSuccessMock).toHaveBeenCalledWith("文件已打开");
  });

  it("uses persistent desktop activity for native open flows", async () => {
    capabilitiesMock.mockReturnValue({ nativeFiles: true });
    const { openFileWithFeedback } = await import("./fileTaskFeedback");

    await openFileWithFeedback(output);

    expect(startActivityMock).toHaveBeenCalledWith({
      kind: "open",
      title: "打开文件",
      detail: "正在准备文件",
    });
    expect(finishActivityMock).toHaveBeenCalledWith("activity-1", "completed", { detail: "已交给系统打开" });
    expect(messageSuccessMock).not.toHaveBeenCalled();
  });
});