import { afterEach, describe, expect, it, vi } from "vitest";
import type { VirtualDocument } from "@/platform/ipc";

const JDT = "jdt://contents/lib-1.0.jar/org.example/Lib.class?=demo/%5C/m2%5C/lib-1.0.jar%3Corg.example%28Lib.class";
const TEXT = "// Source code is unavailable, and was generated by the Fernflower decompiler.\npackage org.example;\n\npublic class Lib {\n  void run() {}\n}\n";

vi.mock("@/platform/virtualDocs", async (importOriginal) => {
  const actual = await importOriginal<typeof import("@/platform/virtualDocs")>();
  return {
    ...actual,
    virtualDocument: vi.fn(
      async (uri: string): Promise<VirtualDocument> => {
        if (uri !== JDT) throw new Error(`no contents for ${uri}`);
        return {
          uri,
          text: TEXT,
          languageId: "java",
          title: "Lib.class",
          description: "/m2/lib-1.0.jar",
          decompiled: true,
        };
      },
    ),
  };
});

const { EditorController, isTextInput, useTabs, virtualInput } = await import("./controller");
const { createMemoryBackend } = await import("./backend");
const { initialTabsState } = await import("./model/tabs");
const { serializeSession } = await import("./model/session");
const { useDocMeta } = await import("./model/document");

let ctrl: InstanceType<typeof EditorController> | null = null;

afterEach(() => {
  ctrl?.stop();
  ctrl = null;
  useTabs.setState(initialTabsState(), true);
});

const activeTab = () => {
  const s = useTabs.getState();
  const pane = s.panes[s.activePane]!;
  return pane.tabs.find((t) => t.id === pane.active)!;
};

describe("virtual editor input", () => {
  it("describes a library class as a text input keyed by its URI", () => {
    const input = virtualInput({ uri: JDT, title: "Lib.class", description: "/m2/lib-1.0.jar", decompiled: true });
    expect(input).toMatchObject({ kind: "virtual", key: `virtual:${JDT}`, path: JDT });
    expect(input.data).toEqual({ title: "Lib.class", description: "/m2/lib-1.0.jar", decompiled: true });
    expect(isTextInput(input)).toBe(true);
    expect(isTextInput({ kind: "diff", key: "d" })).toBe(false);
  });

  it("opens a URI read-only at the target and keeps it out of the saved session", async () => {
    ctrl = new EditorController(createMemoryBackend({ "/p/App.java": "class App {}\n", [JDT]: TEXT }));
    ctrl.start();
    await ctrl.openFile("/p/App.java", { focus: false });
    await ctrl.openFile(JDT, { selection: { line: 3, col: 13, endLine: 3, endCol: 16 }, focus: false });

    const tab = activeTab();
    expect(tab.input.kind).toBe("virtual");
    expect(tab.input.key).toBe(`virtual:${JDT}`);
    const slot = ctrl.slotFor(tab.id)!;
    expect(slot.model.virtual).toBe(true);
    expect(slot.model.ctx()).toMatchObject({ path: JDT, language: "java", readOnly: true, virtual: true });
    expect(useDocMeta.getState()[JDT]).toMatchObject({ readOnly: true, banner: null });
    const sel = slot.currentState().selection.main;
    expect(slot.currentState().sliceDoc(sel.from, sel.to)).toBe("Lib");

    // The same URI reuses its tab.
    await ctrl.openFile(JDT, { focus: false });
    expect(Object.values(useTabs.getState().panes).flatMap((p) => p.tabs)).toHaveLength(2);

    // Navigation history goes back to the file and forward into the library class.
    await ctrl.back();
    expect(activeTab().input.path).toBe("/p/App.java");
    await ctrl.forward();
    expect(activeTab().input.path).toBe(JDT);

    const session = serializeSession(useTabs.getState(), {});
    expect(JSON.stringify(session)).not.toContain("jdt:");
    expect(ctrl.tabMenu(useTabs.getState().activePane, activeTab()).some((i) => "label" in i && i.label === "Reveal in Project")).toBe(false);
  });

  it("does not open a tab when the server has no contents", async () => {
    ctrl = new EditorController(createMemoryBackend());
    ctrl.start();
    await ctrl.openFile("jdt://contents/missing.jar/p/X.class", { focus: false });
    expect(Object.values(useTabs.getState().panes).flatMap((p) => p.tabs)).toHaveLength(0);
  });
});