import { afterEach, describe, expect, test, vi } from "vitest";
import {
  act,
  fireEvent,
  screen,
  waitFor,
  within,
} from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { DumpCreateModal } from "../../../../components/dump/create/DumpCreateModal.tsx";
import { calls, fail, route } from "../../../fetch.ts";
import {
  makeCategory,
  makeDump,
  makePlaylist,
  makeSession,
  wire,
} from "../../../fixtures.ts";
import { currentPath, renderWithContexts } from "../../../render.tsx";

const session = makeSession({ username: "me" });
const categories = [makeCategory({ id: "c1", name: "Music" })];

function setup(
  props: Partial<React.ComponentProps<typeof DumpCreateModal>> = {},
) {
  const onClose = vi.fn();
  const injectDump = vi.fn();
  const user = userEvent.setup();
  renderWithContexts(<DumpCreateModal onClose={onClose} {...props} />, {
    session,
    categories,
    ws: { injectDump },
  });
  return { user, onClose, injectDump };
}

function previewRoutes(
  { title = "Page title", reached = true, dupes = [] as unknown[] } = {},
) {
  route("GET /api/preview", (req) => ({
    reached,
    richContent: reached
      ? {
        type: "link",
        url: req.url.searchParams.get("url"),
        title,
        siteName: "Site",
      }
      : { type: "link", url: req.url.searchParams.get("url") },
  }));
  route("GET /api/dumps/by-url", () => dupes);
}

const nextBtn = () => screen.getByRole("button", { name: "Next →" });
const linkBox = () => screen.getByPlaceholderText("Paste a link…");

describe("DumpCreateModal: a link", () => {
  test("Next stays disabled until there is a link or a file", async () => {
    const { user } = setup();
    expect(screen.getByRole("dialog", { name: "New dump" }))
      .toBeInTheDocument();
    expect(nextBtn()).toBeDisabled();
    await user.type(linkBox(), "not a url at all");
    expect(nextBtn()).toBeDisabled();
  });

  test("previews the page and suggests its title", async () => {
    previewRoutes();
    const { user } = setup();
    await user.type(linkBox(), "example.com/a");
    expect(await screen.findByText("Fetching preview…")).toBeInTheDocument();
    // The suggestion is written in an effect just after the field appears.
    const title = await screen.findByLabelText("Title");
    await waitFor(() => expect(title).toHaveValue("Page title"));
    expect(title).toBeDisabled();
    const [req] = calls("GET /api/preview");
    expect(req.url.searchParams.get("url")).toBe("https://example.com/a");
    expect(req.headers.get("Authorization")).toMatch(/^Bearer /);
  });

  test("an unreachable page says so, but can still be posted", async () => {
    previewRoutes({ reached: false });
    const { user } = setup();
    await user.type(linkBox(), "https://down.test/");
    expect(await screen.findByText(/Couldn't load a preview/))
      .toBeInTheDocument();
    expect(nextBtn()).toBeEnabled();
  });

  test("warns about an earlier dump of the same link", async () => {
    previewRoutes({
      dupes: [
        {
          id: "old",
          slug: "old-one",
          title: "Old one",
          username: "ann",
          createdAt: new Date(Date.now() - 3600_000).toISOString(),
          voteCount: 1,
          commentCount: 0,
        },
        {
          id: "older",
          title: "Older",
          username: "bob",
          createdAt: new Date(0).toISOString(),
          voteCount: 0,
          commentCount: 0,
        },
      ],
    });
    const { user, onClose } = setup();
    await user.type(linkBox(), "https://x.test/");
    const notice = await screen.findByText(/Already dumped by ann/);
    expect(notice.closest("[role=status]")).toHaveTextContent(
      "and 1 earlier dump",
    );
    await user.click(screen.getByRole("link", { name: "Old one" }));
    expect(currentPath()).toBe("/dumps/old-one");
    expect(onClose).toHaveBeenCalled();
  });

  test("the whole way through: post, then add to a playlist", async () => {
    previewRoutes();
    const created = makeDump({
      id: "new",
      slug: "page-title",
      title: "Page title",
      userId: session.user.id,
    });
    route("POST /api/dumps", () => wire(created));
    const mix = makePlaylist({ id: "p1", title: "Mix" });
    route(
      "GET /api/playlists/by-dump/:id/memberships",
      () => [{ playlist: wire(mix), hasDump: false }],
    );
    route("POST /api/playlists/:pid/dumps/:did", () => ({}));
    const { user, injectDump, onClose } = setup();

    await user.type(linkBox(), "example.com/a");
    await screen.findByLabelText("Title");
    await user.click(nextBtn());

    expect(screen.getByText(/example\.com\/a|Page title/)).toBeInTheDocument();
    const why = screen.getByLabelText("Why?");
    await waitFor(() => expect(why).toHaveFocus());
    await user.type(why, "  Because  ");
    await user.click(screen.getByRole("button", { name: "Music" }));
    await user.click(screen.getByRole("button", { name: "Private" }));
    await user.click(screen.getByRole("button", { name: "Dump it" }));

    await screen.findByRole("dialog", { name: "Add to playlist" });
    expect(calls("POST /api/dumps")[0].body).toEqual({
      url: "https://example.com/a",
      comment: "Because",
      isPrivate: true,
      categoryIds: ["c1"],
    });
    expect(injectDump).toHaveBeenCalledWith(
      expect.objectContaining({ id: "new" }),
    );
    expect(localStorage.getItem("gerbeur.dumpDraft")).toBeNull();

    const row = await screen.findByRole("checkbox", { name: /Mix/ });
    expect(row).toHaveAttribute("aria-checked", "false");
    row.focus();
    await user.keyboard(" ");
    await waitFor(() => expect(row).toHaveAttribute("aria-checked", "true"));
    expect(calls("POST /api/playlists/:pid/dumps/:did")[0].path).toBe(
      "/api/playlists/p1/dumps/new",
    );

    await user.click(screen.getByRole("button", { name: "Done" }));
    expect(onClose).toHaveBeenCalled();
  });

  test("a refused playlist toggle leaves the box as it was", async () => {
    previewRoutes();
    route("POST /api/dumps", () => wire(makeDump({ id: "new" })));
    route(
      "GET /api/playlists/by-dump/:id/memberships",
      () => [{
        playlist: wire(makePlaylist({ title: "Mix" })),
        hasDump: false,
      }],
    );
    route("POST /api/playlists/:pid/dumps/:did", () => fail("Forbidden", 403));
    const { user } = setup();
    await user.type(linkBox(), "https://a.test/{Enter}");
    await user.click(await screen.findByRole("button", { name: "Dump it" }));
    const row = await screen.findByRole("checkbox", { name: /Mix/ });
    await user.click(row);
    await act(async () => {});
    expect(row).toHaveAttribute("aria-checked", "false");
  });

  test("a title typed by the poster is sent; a suggested one isn't", async () => {
    previewRoutes();
    route("POST /api/dumps", () => wire(makeDump()));
    route("GET /api/playlists/by-dump/:id/memberships", () => []);
    const { user } = setup();
    await user.type(linkBox(), "https://a.test/");
    await waitFor(() =>
      expect(screen.getByLabelText("Title")).toHaveValue("Page title")
    );
    await user.click(screen.getByRole("button", { name: "Edit title" }));
    const title = screen.getByLabelText("Title");
    await waitFor(() => expect(title).toHaveFocus());
    await user.clear(title);
    await user.type(title, "My title");
    // The suggestion can be had back.
    await user.click(
      screen.getByRole("button", { name: "Reset to the suggested title" }),
    );
    expect(title).toHaveValue("Page title");
    await user.click(screen.getByRole("button", { name: "Edit title" }));
    await user.clear(title);
    await user.type(title, "Mine after all");
    await user.click(nextBtn());
    await user.click(screen.getByRole("button", { name: "Dump it" }));
    await waitFor(() => expect(calls("POST /api/dumps")).toHaveLength(1));
    expect(calls("POST /api/dumps")[0].body).toMatchObject({
      title: "Mine after all",
    });
  });

  test("Enter in the link field goes to the next step rather than posting", async () => {
    previewRoutes();
    const { user } = setup();
    await user.type(linkBox(), "https://a.test/{Enter}");
    expect(screen.getByLabelText("Why?")).toBeInTheDocument();
    expect(calls("POST /api/dumps")).toHaveLength(0);
    await user.click(screen.getByRole("button", { name: "← Back" }));
    expect(linkBox()).toHaveValue("https://a.test/");
  });

  test("a failed post shows the server's message and stays put", async () => {
    previewRoutes();
    route("POST /api/dumps", () => fail("That URL isn't allowed", 400));
    const { user } = setup();
    await user.type(linkBox(), "https://a.test/{Enter}");
    await user.click(screen.getByRole("button", { name: "Dump it" }));
    const alert = await screen.findByRole("alert");
    expect(alert).toHaveTextContent("Failed to post");
    expect(alert).toHaveTextContent("That URL isn't allowed");
    expect(screen.getByRole("dialog", { name: "New dump" }))
      .toBeInTheDocument();
  });

  test("starts from a shared URL", async () => {
    previewRoutes();
    setup({ initialUrl: "https://shared.test/x" });
    expect(linkBox()).toHaveValue("https://shared.test/x");
    await screen.findByLabelText("Title");
  });

  test("a link pasted anywhere in the modal lands in the link field", async () => {
    previewRoutes();
    setup();
    act(() => {
      const e = new Event("paste", { bubbles: true }) as ClipboardEvent;
      Object.defineProperty(e, "clipboardData", {
        value: { files: [], getData: () => "pasted.test/page" },
      });
      screen.getByRole("dialog").dispatchEvent(e);
    });
    expect(linkBox()).toHaveValue("https://pasted.test/page");
  });
});

describe("DumpCreateModal: drafts", () => {
  test("a dismissed draft comes back, and can be dropped", async () => {
    localStorage.setItem(
      "gerbeur.dumpDraft",
      JSON.stringify({
        url: "https://draft.test/",
        title: "",
        titleFromUser: false,
        comment: "half-written",
        isPublic: false,
        categoryIds: ["c1"],
      }),
    );
    previewRoutes();
    const { user } = setup();
    expect(screen.getByText("Picked up where you left off."))
      .toBeInTheDocument();
    expect(linkBox()).toHaveValue("https://draft.test/");
    await user.click(nextBtn());
    expect(screen.getByLabelText("Why?")).toHaveValue("half-written");
    expect(screen.getByRole("button", { name: "Music" })).toHaveAttribute(
      "aria-pressed",
      "true",
    );
    await user.click(screen.getByRole("button", { name: "← Back" }));
    await user.click(screen.getByRole("button", { name: "Start fresh" }));
    expect(linkBox()).toHaveValue("");
    expect(localStorage.getItem("gerbeur.dumpDraft")).toBeNull();
  });

  test("what's typed is kept as it's typed", async () => {
    previewRoutes();
    const { user } = setup();
    await user.type(linkBox(), "https://keep.test/");
    expect(JSON.parse(localStorage.getItem("gerbeur.dumpDraft")!).url).toBe(
      "https://keep.test/",
    );
  });

  test("a shared URL starts clean rather than merging an old draft", () => {
    localStorage.setItem(
      "gerbeur.dumpDraft",
      JSON.stringify({ url: "https://old.test/", comment: "old why" }),
    );
    previewRoutes();
    setup({ initialUrl: "https://new.test/" });
    expect(screen.queryByText("Picked up where you left off.")).not
      .toBeInTheDocument();
    expect(linkBox()).toHaveValue("https://new.test/");
  });
});

describe("DumpCreateModal: a file", () => {
  class FakeXHR {
    static last: FakeXHR;
    status = 0;
    statusText = "";
    responseText = "";
    body: FormData | null = null;
    private l: Record<string, Array<(e: unknown) => void>> = {};
    private u: Record<string, Array<(e: unknown) => void>> = {};
    upload = {
      addEventListener: (t: string, f: (e: unknown) => void) =>
        (this.u[t] ??= []).push(f),
    };
    constructor() {
      FakeXHR.last = this;
    }
    open() {}
    setRequestHeader() {}
    addEventListener(t: string, f: (e: unknown) => void) {
      (this.l[t] ??= []).push(f);
    }
    send(body: FormData) {
      this.body = body;
    }
    progress(f: number) {
      this.u.progress?.forEach((fn) =>
        fn({ loaded: f * 100, total: 100, lengthComputable: true })
      );
    }
    respond(status: number, data: unknown) {
      this.status = status;
      this.responseText = JSON.stringify(data);
      this.l.load?.forEach((fn) => fn({}));
    }
  }
  afterEach(() => vi.unstubAllGlobals());

  const song = () =>
    new File([new Uint8Array(10)], "my_song-final.mp3", { type: "audio/mpeg" });

  test("a dropped file names the dump and uploads with progress", async () => {
    vi.stubGlobal("XMLHttpRequest", FakeXHR);
    vi.spyOn(URL, "createObjectURL").mockReturnValue("blob:x");
    vi.spyOn(URL, "revokeObjectURL").mockImplementation(() => {});
    route("GET /api/playlists/by-dump/:id/memberships", () => []);
    const { user } = setup();
    fireEvent.drop(screen.getByRole("dialog").querySelector(".dump-create")!, {
      dataTransfer: { files: [song()] },
    });
    expect(screen.queryByPlaceholderText("Paste a link…")).not
      .toBeInTheDocument();
    expect(screen.getByText("my_song-final.mp3")).toBeInTheDocument();
    expect(screen.getByLabelText("Title")).toHaveValue("my song-final");
    await user.click(nextBtn());
    await user.click(screen.getByRole("button", { name: "Dump it" }));
    act(() => FakeXHR.last.progress(0.42));
    expect(screen.getByRole("progressbar")).toHaveAttribute(
      "aria-valuenow",
      "42",
    );
    expect(screen.getByRole("button", { name: "Uploading 42%" }))
      .toBeDisabled();
    const fd = FakeXHR.last.body!;
    expect(fd.get("title")).toBe("my song-final");
    expect(fd.get("isPrivate")).toBe("false");
    expect(fd.get("categoryIds")).toBe("[]");
    await act(async () =>
      FakeXHR.last.respond(201, {
        success: true,
        data: wire(makeDump({ id: "f" })),
      })
    );
    await screen.findByRole("dialog", { name: "Add to playlist" });
  });

  test("closing with a file attached asks first", async () => {
    vi.spyOn(URL, "createObjectURL").mockReturnValue("blob:x");
    const { user, onClose } = setup();
    fireEvent.drop(screen.getByRole("dialog").querySelector(".dump-create")!, {
      dataTransfer: { files: [song()] },
    });
    await user.keyboard("{Escape}");
    expect(onClose).not.toHaveBeenCalled();
    const confirm = screen.getByText(/The attached file won't be kept/).closest(
      "[role=alert]",
    )!;
    await user.click(
      within(confirm as HTMLElement).getByRole("button", {
        name: "Keep editing",
      }),
    );
    expect(screen.queryByText(/The attached file won't be kept/)).not
      .toBeInTheDocument();
    await user.click(screen.getByRole("button", { name: "Cancel" }));
    await user.click(screen.getByRole("button", { name: "Close anyway" }));
    expect(onClose).toHaveBeenCalled();
  });

  test("without a file, closing just closes", async () => {
    const { user, onClose } = setup();
    await user.keyboard("{Escape}");
    expect(onClose).toHaveBeenCalled();
  });

  test("removing the file offers the link field again", async () => {
    vi.spyOn(URL, "createObjectURL").mockReturnValue("blob:x");
    const { user } = setup();
    fireEvent.drop(screen.getByRole("dialog").querySelector(".dump-create")!, {
      dataTransfer: { files: [song()] },
    });
    await user.click(screen.getByRole("button", { name: "Remove file" }));
    expect(linkBox()).toBeInTheDocument();
  });
});