import { describe, expect, test, vi } from "vitest";
import {
  act,
  fireEvent,
  screen,
  waitFor,
  within,
} from "@testing-library/react";
import { userEvent } from "@testing-library/user-event";
import { Route } from "react-router";
import { PlaylistDetail } from "../../pages/PlaylistDetail.tsx";
import type { Dump } from "../../../shared/dump.ts";
import type { Playlist } from "../../../shared/playlist.ts";
import { calls, fail, route } from "../fetch.ts";
import {
  makeCategory,
  makeDump,
  makePlaylist,
  makeSession,
  wire,
} from "../fixtures.ts";
import { currentPath, renderApp } from "../render.tsx";
import { FakeWebSocket } from "../ws.ts";

const owner = makeSession({ id: "owner", username: "owner" });
const visitor = makeSession({ id: "visitor" });

const dumps = () => [
  makeDump({ id: "a", title: "Alpha" }),
  makeDump({ id: "b", title: "Bravo" }),
  makeDump({ id: "c", title: "Charlie" }),
];

function open(
  {
    session = owner as ReturnType<typeof makeSession> | null,
    playlist = {} as Partial<Playlist>,
    items = dumps() as Dump[],
    url = "/@owner/playlists/mix",
    categories = [] as ReturnType<typeof makeCategory>[],
  } = {},
) {
  const pl = makePlaylist({
    id: "p1",
    slug: "mix",
    title: "Mix",
    userId: "owner",
    ownerUsername: "owner",
    description: "Good **tunes**",
    ...playlist,
  });
  route(
    "GET /api/users/:u/playlists/:slug",
    () => wire({ ...pl, dumps: items }),
  );
  const user = userEvent.setup();
  renderApp(<PlaylistDetail />, {
    route: url,
    path: "/:handle/playlists/:slug",
    session,
    categories,
    extraRoutes: (
      <>
        <Route path="/" element={<p>home</p>} />
        <Route
          path="/:handle/playlists/:slug/edit"
          element={<PlaylistDetail editing />}
        />
      </>
    ),
  });
  const socket = FakeWebSocket.last;
  socket.welcome();
  return { user, socket, pl };
}

const titles = () =>
  Array.from(document.querySelectorAll(".dump-card-title")).map((a) =>
    a.textContent
  );

describe("PlaylistDetail", () => {
  test("shows the playlist and its dumps in order", async () => {
    open({ session: null });
    expect(await screen.findByRole("heading", { name: "Mix" }))
      .toBeInTheDocument();
    expect(screen.getByText("tunes").tagName).toBe("STRONG");
    expect(screen.getByRole("link", { name: "@owner" })).toHaveAttribute(
      "href",
      "/@owner",
    );
    expect(calls("GET /api/users/:u/playlists/:slug")[0].path).toBe(
      "/api/users/@owner/playlists/mix",
    );
    expect(titles()).toEqual(["Alpha", "Bravo", "Charlie"]);
    await waitFor(() => expect(document.title).toMatch(/^Mix · /));
    expect(screen.queryByRole("button", { name: "Edit" })).not
      .toBeInTheDocument();
  });

  test("not found", async () => {
    route(
      "GET /api/users/:u/playlists/:slug",
      () => fail("Playlist not found", 404),
    );
    renderApp(<PlaylistDetail />, {
      route: "/@owner/playlists/x",
      path: "/:handle/playlists/:slug",
    });
    expect(await screen.findByRole("alert")).toHaveTextContent(
      "Playlist not found",
    );
  });

  test("a visitor can follow a public playlist, not edit it", async () => {
    open({ session: visitor });
    await screen.findByRole("heading", { name: "Mix" });
    expect(screen.getByRole("button", { name: "Follow playlist" }))
      .toBeInTheDocument();
    expect(screen.queryByRole("button", { name: "Remove from playlist" })).not
      .toBeInTheDocument();
  });

  test("the cover is versioned on the last edit", async () => {
    open({ playlist: { imageMime: "image/png", updatedAt: new Date(5000) } });
    await screen.findByRole("heading", { name: "Mix" });
    expect(document.querySelector(".playlist-detail-img")).toHaveAttribute(
      "src",
      "http://localhost:8000/api/playlists/p1/cover?v=5000&w=960",
    );
  });

  test("editing the description shows at once, without waiting for the socket", async () => {
    route(
      "PUT /api/playlists/:id",
      () =>
        wire(
          makePlaylist({
            id: "p1",
            slug: "mix",
            title: "Mix",
            userId: "owner",
            description: "Better tunes",
          }),
        ),
    );
    const { user } = open();
    await user.click(await screen.findByRole("button", { name: "Edit" }));
    const box = screen.getByRole("textbox", { name: "Description" });
    await user.clear(box);
    await user.type(box, "Better tunes");
    await user.click(screen.getByRole("button", { name: "Save" }));
    // Saving closes the editor, whose text would be found first.
    await waitFor(() => expect(currentPath()).toBe("/@owner/playlists/mix"));
    expect(screen.getByText("Better tunes")).toBeInTheDocument();
    expect(calls("PUT /api/playlists/:id")[0].body).toEqual({
      description: "Better tunes",
      isPublic: true,
    });
  });

  test("the editor is a page: /edit opens it, closing goes back to the page", async () => {
    const { user } = open({ url: "/@owner/playlists/mix/edit" });
    expect(await screen.findByRole("textbox", { name: "Description" }))
      .toBeInTheDocument();
    await user.click(screen.getByRole("button", { name: "Cancel" }));
    expect(currentPath()).toBe("/@owner/playlists/mix");
    await user.click(screen.getByRole("button", { name: "Edit" }));
    expect(currentPath()).toBe("/@owner/playlists/mix/edit");
    expect(calls("GET /api/users/:u/playlists/:slug")).toHaveLength(1);
  });

  test("at /edit, anyone else gets the page", async () => {
    open({ session: visitor, url: "/@owner/playlists/mix/edit" });
    await waitFor(() => expect(currentPath()).toBe("/@owner/playlists/mix"));
    expect(screen.queryByRole("textbox", { name: "Description" })).toBeNull();
  });

  test("at /edit, a guest is asked to sign in first", async () => {
    open({ session: null, url: "/@owner/playlists/mix/edit" });
    await waitFor(() =>
      expect(currentPath()).toBe(
        "/login?next=%2F%40owner%2Fplaylists%2Fmix%2Fedit",
      )
    );
  });

  test("its categories show, and editing them sends the new set", async () => {
    const mixes = makeCategory({
      id: "pc1",
      kind: "playlist",
      slug: "mixes",
      name: "Mixes",
    });
    const live = makeCategory({
      id: "pc2",
      kind: "playlist",
      slug: "live",
      name: "Live",
    });
    const music = makeCategory({ id: "dc1", slug: "music", name: "Music" });
    route(
      "PUT /api/playlists/:id",
      (req) =>
        wire(
          makePlaylist({
            id: "p1",
            slug: "mix",
            title: "Mix",
            userId: "owner",
            ...(req.body as object),
          }),
        ),
    );
    const { user } = open({
      playlist: { categoryIds: ["pc1"] },
      categories: [music, mixes, live],
    });
    expect(await screen.findByRole("link", { name: "Mixes" }))
      .toHaveAttribute("href", "/playlists/mixes");

    await user.click(screen.getByRole("button", { name: "Edit" }));
    // The dump categories aren't offered.
    expect(screen.queryByRole("button", { name: "Music" })).toBeNull();
    expect(screen.getByRole("button", { name: "Mixes" }))
      .toHaveAttribute("aria-pressed", "true");
    await user.click(screen.getByRole("button", { name: "Mixes" }));
    await user.click(screen.getByRole("button", { name: "Live" }));
    await user.click(screen.getByRole("button", { name: "Save" }));
    expect(await screen.findByRole("link", { name: "Live" }))
      .toHaveAttribute("href", "/playlists/live");
    expect(calls("PUT /api/playlists/:id")[0].body).toEqual({
      categoryIds: ["pc2"],
      isPublic: true,
    });
  });

  test("a new title proposes a new link, which saving moves to", async () => {
    route(
      "PUT /api/playlists/:id",
      (req) =>
        wire(
          makePlaylist({
            id: "p1",
            slug: (req.body as { slug: string }).slug,
            title: "Remix",
            userId: "owner",
          }),
        ),
    );
    const { user } = open();
    await user.click(await screen.findByRole("button", { name: "Edit" }));
    const title = screen.getByRole("textbox", { name: "Title" });
    await user.clear(title);
    await user.type(title, "Re-mix!");
    const link = screen.getByRole("textbox", { name: "Link" });
    expect(link).toHaveValue("re-mix");
    expect(screen.getByText("/@owner/playlists/")).toBeInTheDocument();
    await user.clear(link);
    await user.type(link, "remix");
    // Typed in, the link no longer follows the title.
    await user.type(title, "!");
    expect(link).toHaveValue("remix");
    await user.click(screen.getByRole("button", { name: "Save" }));
    await waitFor(() => expect(currentPath()).toBe("/@owner/playlists/remix"));
    expect(calls("PUT /api/playlists/:id")[0].body).toMatchObject({
      title: "Re-mix!!",
      slug: "remix",
    });
    // The new path names the playlist on screen, which isn't fetched again.
    expect(calls("GET /api/users/:u/playlists/:slug")).toHaveLength(1);
  });

  test("a former slug or name: the URL takes the current one", async () => {
    open({ url: "/@OWNER/playlists/old-mix" });
    await screen.findByRole("heading", { name: "Mix" });
    await waitFor(() => expect(currentPath()).toBe("/@owner/playlists/mix"));
    expect(calls("GET /api/users/:u/playlists/:slug")).toHaveLength(1);
  });

  test("a new cover shows once saved; a refused one says why", async () => {
    vi.spyOn(URL, "createObjectURL").mockReturnValue("blob:preview");
    route(
      "PUT /api/playlists/:id",
      () =>
        wire(
          makePlaylist({
            id: "p1",
            slug: "mix",
            title: "Mix",
            userId: "owner",
          }),
        ),
    );
    route("PUT /api/playlists/:id/cover", () => fail("Not an image", 400), {
      once: true,
    });
    route(
      "PUT /api/playlists/:id/cover",
      () =>
        wire(
          makePlaylist({
            id: "p1",
            slug: "mix",
            title: "Mix",
            userId: "owner",
            imageMime: "image/png",
            updatedAt: new Date(9000),
          }),
        ),
    );
    const { user } = open();
    await user.click(await screen.findByRole("button", { name: "Edit" }));
    const picker = document.querySelector<HTMLInputElement>(
      '.img-picker input[type="file"]',
    )!;
    await user.upload(
      picker,
      new File([new Uint8Array(3)], "c.png", { type: "image/png" }),
    );
    await user.click(screen.getByRole("button", { name: "Save" }));
    expect(await screen.findByRole("alert")).toHaveTextContent("Not an image");
    await user.click(screen.getByRole("button", { name: "Save" }));
    await waitFor(() =>
      expect(document.querySelector(".playlist-detail-img")).toHaveAttribute(
        "src",
        "http://localhost:8000/api/playlists/p1/cover?v=9000&w=960",
      )
    );
  });

  test("Escape leaves the editor", async () => {
    const { user } = open();
    await user.click(await screen.findByRole("button", { name: "Edit" }));
    await user.type(screen.getByRole("textbox", { name: "Title" }), "{Escape}");
    expect(screen.getByRole("heading", { name: "Mix" })).toBeInTheDocument();
  });

  test("a removal is sent once its fade ends, and an undo sends nothing", async () => {
    vi.useFakeTimers({ shouldAdvanceTime: true });
    try {
      route(
        "DELETE /api/playlists/:pid/dumps/:did",
        () => new Response(null, { status: 204 }),
      );
      const { user } = open();
      await screen.findByText("Bravo");
      const bravo = screen.getByText("Bravo").closest(
        ".playlist-dump-item",
      ) as HTMLElement;
      await user.click(
        within(bravo).getByRole("button", { name: "Remove from playlist" }),
      );
      await user.click(
        within(bravo).getByRole("button", { name: "Cancel removal" }),
      );
      act(() => vi.advanceTimersByTime(2_400));
      expect(screen.getByText("Bravo")).toBeInTheDocument();
      expect(calls("DELETE /api/playlists/:pid/dumps/:did")).toHaveLength(0);

      await user.click(
        within(bravo).getByRole("button", { name: "Remove from playlist" }),
      );
      act(() => vi.advanceTimersByTime(2_400));
      expect(screen.queryByText("Bravo")).not.toBeInTheDocument();
      expect(calls("DELETE /api/playlists/:pid/dumps/:did")[0].path).toBe(
        "/api/playlists/p1/dumps/b",
      );
    } finally {
      vi.useRealTimers();
    }
  });

  test("leaving the page during the fade still sends the removal", async () => {
    route(
      "DELETE /api/playlists/:pid/dumps/:did",
      () => new Response(null, { status: 204 }),
    );
    const { user } = open();
    await screen.findByText("Bravo");
    const bravo = screen.getByText("Bravo").closest(
      ".playlist-dump-item",
    ) as HTMLElement;
    await user.click(
      within(bravo).getByRole("button", { name: "Remove from playlist" }),
    );
    act(() => globalThis.dispatchEvent(new Event("pagehide")));
    expect(calls("DELETE /api/playlists/:pid/dumps/:did")).toHaveLength(1);
  });

  test("a refused removal puts the dump back and says so", async () => {
    vi.useFakeTimers({ shouldAdvanceTime: true });
    try {
      route(
        "DELETE /api/playlists/:pid/dumps/:did",
        () => fail("Forbidden", 403),
      );
      const { user } = open();
      await screen.findByText("Bravo");
      const bravo = screen.getByText("Bravo").closest(
        ".playlist-dump-item",
      ) as HTMLElement;
      await user.click(
        within(bravo).getByRole("button", { name: "Remove from playlist" }),
      );
      act(() => vi.advanceTimersByTime(2_400));
      expect(await screen.findByRole("alert")).toHaveTextContent(
        "couldn't be removed",
      );
      expect(titles()).toEqual(["Alpha", "Bravo", "Charlie"]);
    } finally {
      vi.useRealTimers();
    }
  });

  test("dragging reorders, and a refused reorder goes back to the server's order", async () => {
    route("PUT /api/playlists/:pid/order", () => fail("Forbidden", 403));
    open();
    await screen.findByText("Charlie");
    const items = () =>
      Array.from(document.querySelectorAll<HTMLElement>(".playlist-dump-item"));
    for (const el of items()) {
      el.getBoundingClientRect = () => ({ top: 0, height: 100 }) as DOMRect;
    }
    const [a, , c] = items();
    fireEvent.dragStart(a);
    fireEvent.dragOver(c, { clientY: 90 });
    expect(titles()).toEqual(["Bravo", "Charlie", "Alpha"]);
    fireEvent.dragEnd(items()[2]);
    await waitFor(() =>
      expect(calls("PUT /api/playlists/:pid/order")).toHaveLength(1)
    );
    expect(calls("PUT /api/playlists/:pid/order")[0].body).toEqual({
      dumpIds: ["b", "c", "a"],
    });
    expect(await screen.findByRole("alert")).toHaveTextContent(
      "order couldn't be saved",
    );
    expect(titles()).toEqual(["Alpha", "Bravo", "Charlie"]);
  });

  test("a dump that goes private leaves, and comes back at its place", async () => {
    route(
      "GET /api/dumps/:id",
      () => wire(makeDump({ id: "b", title: "Bravo" })),
    );
    const { socket } = open({ session: visitor });
    await screen.findByText("Bravo");
    // What the server sends others when it goes private, then public again.
    socket.receive({ type: "dump_deleted", dumpId: "b" });
    socket.receive({
      type: "playlist_dumps_updated",
      playlistId: "p1",
      dumpIds: ["a", "c"],
    });
    expect(titles()).toEqual(["Alpha", "Charlie"]);
    socket.receive({
      type: "dump_created",
      dump: wire(makeDump({ id: "b", title: "Bravo" })),
    });
    socket.receive({
      type: "playlist_dumps_updated",
      playlistId: "p1",
      dumpIds: ["a", "b", "c"],
    });
    expect(await screen.findByText("Bravo")).toBeInTheDocument();
    expect(titles()).toEqual(["Alpha", "Bravo", "Charlie"]);
  });

  test("a playlist made private by its owner sends a visitor home", async () => {
    const { socket } = open({ session: visitor });
    await screen.findByText("Alpha");
    // What the server sends everyone but the owner.
    socket.receive({
      type: "playlist_deleted",
      playlistId: "p1",
      userId: "owner",
    });
    expect(await screen.findByText("home")).toBeInTheDocument();
  });

  test("deleting the playlist asks, then goes home", async () => {
    route(
      "DELETE /api/playlists/:id",
      () => new Response(null, { status: 204 }),
    );
    const { user } = open();
    await user.click(await screen.findByRole("button", { name: "Edit" }));
    await user.click(screen.getByRole("button", { name: "Delete playlist" }));
    await user.click(
      within(screen.getByRole("alertdialog")).getByRole("button", {
        name: "Delete playlist",
      }),
    );
    expect(await screen.findByText("home")).toBeInTheDocument();
  });

  test("a refused delete stays and says why", async () => {
    route("DELETE /api/playlists/:id", () => fail("Forbidden", 403));
    const { user } = open();
    await user.click(await screen.findByRole("button", { name: "Edit" }));
    await user.click(screen.getByRole("button", { name: "Delete playlist" }));
    await user.click(
      within(screen.getByRole("alertdialog")).getByRole("button", {
        name: "Delete playlist",
      }),
    );
    expect(await screen.findByRole("alert")).toHaveTextContent("Forbidden");
    expect(currentPath()).toBe("/@owner/playlists/mix/edit");
  });

  test("live: added dumps appear, removed ones fade, a deleted playlist sends you home", async () => {
    route(
      "GET /api/dumps/:id",
      () => wire(makeDump({ id: "d", title: "Delta" })),
    );
    const { socket } = open({ session: visitor });
    await screen.findByText("Alpha");
    socket.receive({
      type: "playlist_dumps_updated",
      playlistId: "p1",
      dumpIds: ["d", "a", "b", "c"],
    });
    expect(await screen.findByText("Delta")).toBeInTheDocument();
    socket.receive({
      type: "playlist_updated",
      playlist: wire(
        makePlaylist({ id: "p1", title: "Renamed", userId: "owner" }),
      ),
    });
    expect(screen.getByRole("heading", { name: "Renamed" }))
      .toBeInTheDocument();
    socket.receive({ type: "dump_deleted", dumpId: "a" });
    expect(screen.queryByText("Alpha")).not.toBeInTheDocument();
    socket.receive({
      type: "playlist_deleted",
      playlistId: "p1",
      userId: "owner",
    });
    expect(await screen.findByText("home")).toBeInTheDocument();
  });
});