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

const show = vi.fn();
vi.mock("@/workbench/contributions", async (orig) => ({
  ...(await orig<typeof import("@/workbench/contributions")>()),
  toolWindowService: () => ({ show }),
}));
const referenceResponse = vi.fn();
const lspReferences = vi.fn(async (..._args: unknown[]) => ({ status: "ok", data: null }));
vi.mock("@/platform/ipc", async (orig) => {
  const actual = await orig<typeof import("@/platform/ipc")>();
  return { ...actual, commands: { ...actual.commands, lspReferences } };
});
vi.mock("./ipc", async (orig) => ({
  ...(await orig<typeof import("./ipc")>()),
  caretContext: () => ({ doc: 1, path: "/p/a.rs", line: 0, col: 0, word: "used", view: null }),
  lspRequest: (request: () => unknown) => {
    request();
    return referenceResponse();
  },
  readManyFileLines: async () => new Map([["/p/b.rs", ["", "    used();", "    used();"]]]),
}));
const channels: { onmessage: (refs: unknown) => void }[] = [];
vi.mock("@tauri-apps/api/core", async (orig) => ({
  ...(await orig<object>()),
  Channel: class {
    onmessage = () => {};
    constructor() {
      channels.push(this);
    }
  },
}));

const { activeUsageSearch, findUsages, openUsageTab, pinUsageTab, resetUsages, showUsageResults, useUsages } =
  await import("./usages");

describe("showUsageResults", () => {
  it("shows given usages in the Find Usages tool window", async () => {
    const loc = { path: "/p/b.rs", range: { start: { line: 1, col: 4 }, end: { line: 1, col: 8 } } };
    await showUsageResults({ symbol: "used", locations: [loc] });
    expect(show).toHaveBeenCalledWith("usages");
    const search = activeUsageSearch(useUsages.getState())!;
    expect(search).toMatchObject({ symbol: "used", loading: false, error: null, rerun: null });
    expect(search.groups).toEqual([
      { path: "/p/b.rs", usages: [{ path: "/p/b.rs", line: 1, col: 4, endCol: 8, text: "    used();" }] },
    ]);
  });

  it("shows the lines the server gave along for files it does not read", async () => {
    const lib = {
      path: "jdt://contents/lib/Lib.class",
      range: { start: { line: 3, col: 4 }, end: { line: 3, col: 8 } },
    };
    await showUsageResults({
      symbol: "used",
      locations: [lib],
      classified: [{ location: lib, kind: "unknown", text: "    used();" }],
    });
    expect(activeUsageSearch(useUsages.getState())!.groups[0]!.usages[0]!.text).toBe("    used();");
  });

  it("ignores malformed arguments", async () => {
    show.mockClear();
    await showUsageResults({ symbol: "x" });
    expect(show).not.toHaveBeenCalled();
  });
});

describe("findUsages", () => {
  it("searches Project Files, then Project and Libraries on request", async () => {
    const at = { path: "/p/b.rs", range: { start: { line: 1, col: 4 }, end: { line: 1, col: 8 } } };
    lspReferences.mockClear();
    referenceResponse.mockResolvedValueOnce({ locations: [at], incomplete: null, librariesSkipped: true });
    await findUsages();
    const project = activeUsageSearch(useUsages.getState())!;
    expect(project).toMatchObject({ loading: false, scope: "project" });
    expect(lspReferences.mock.lastCall![5]).toBe(false);
    referenceResponse.mockResolvedValueOnce({ locations: [at], incomplete: null });
    project.searchLibraries!();
    await vi.waitFor(() => expect(activeUsageSearch(useUsages.getState())!.loading).toBe(false));
    expect(lspReferences.mock.lastCall![5]).toBe(true);
    const all = activeUsageSearch(useUsages.getState())!;
    expect(all.scope).toBe("libraries");
    // Rerun keeps the scope.
    referenceResponse.mockResolvedValueOnce({ locations: [at], incomplete: null });
    all.rerun!();
    await vi.waitFor(() => expect(lspReferences).toHaveBeenCalledTimes(3));
    expect(lspReferences.mock.lastCall![5]).toBe(true);
    resetUsages();
  });

  it("shows the usages found first while it searches for the rest", async () => {
    const at = (line: number) => ({ path: "/p/b.rs", range: { start: { line, col: 4 }, end: { line, col: 8 } } });
    let resolve!: (refs: unknown) => void;
    referenceResponse.mockReturnValueOnce(new Promise((r) => (resolve = r)));
    const search = findUsages();
    await vi.waitFor(() => expect(channels).not.toHaveLength(0));
    channels.at(-1)!.onmessage({ locations: [at(1)], incomplete: null });
    await vi.waitFor(() => expect(activeUsageSearch(useUsages.getState())!.groups).toHaveLength(1));
    expect(activeUsageSearch(useUsages.getState())).toMatchObject({ loading: true, error: null });
    resolve({ locations: [at(1), at(2)], incomplete: null });
    await search;
    const done = activeUsageSearch(useUsages.getState())!;
    expect(done.loading).toBe(false);
    expect(done.groups[0]!.usages.map((u) => u.line)).toEqual([1, 2]);
    resetUsages();
  });
});

describe("usage tabs", () => {
  const search = (id: number) => ({
    id,
    symbol: `s${id}`,
    loading: false,
    groups: [],
    error: null,
    note: null,
    rerun: null,
  });

  it("replace the selected tab unless it is pinned", () => {
    resetUsages();
    openUsageTab(search(101));
    openUsageTab(search(102));
    expect(useUsages.getState().tabs.map((t) => t.id)).toEqual([102]);
    pinUsageTab(102, true);
    openUsageTab(search(103));
    expect(useUsages.getState().tabs.map((t) => t.id)).toEqual([102, 103]);
    expect(activeUsageSearch(useUsages.getState())?.id).toBe(103);
    openUsageTab(search(104));
    expect(useUsages.getState().tabs.map((t) => t.id)).toEqual([102, 104]);
  });
});