// @vitest-environment jsdom

import { fireEvent, render, screen, waitFor } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { useEffect } from "react";
import { MemoryRouter } from "react-router-dom";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

import { createTechLogFeatureInstalledInput } from "../../../src/features/tech-log/adapters/create-tech-log-feature-input.ts";
import { MOCK_STUDIO_INSTALL_CONTEXT } from "../../helpers/studio-install-context.ts";
import { FIXTURE_IDS } from "../../../src/features/tech-log/adapters/mock/fixtures.ts";
import { StudioGatewayError } from "../../../src/features/tech-log/application/ports/studio-gateway-error.ts";
import type { StudioGateway } from "../../../src/features/tech-log/application/ports/studio-gateway.ts";
import type {
  WorkingCopy,
  WorkingCopyInput,
  WorkingCopyDetail,
} from "../../../src/features/tech-log/contracts/studio/contract.ts";
import { DocumentEditorScreen } from "../../../src/features/tech-log/presentation/studio/components/document-editor-screen.tsx";
import { GuardedStudioLink } from "../../../src/features/tech-log/presentation/studio/components/guarded-studio-link.tsx";
import { StudioProvider } from "../../../src/features/tech-log/presentation/studio/studio-provider.tsx";
import {
  useStudio,
  useStudioEditorSession,
} from "../../../src/features/tech-log/presentation/studio/use-studio.ts";
import { createManagementGatewayStub } from "../../helpers/management-gateway-stub.ts";

const originalShowModal = HTMLDialogElement.prototype.showModal;
const originalClose = HTMLDialogElement.prototype.close;

beforeEach(() => {
  Object.defineProperty(HTMLDialogElement.prototype, "showModal", {
    configurable: true,
    value(this: HTMLDialogElement) {
      this.setAttribute("open", "");
    },
  });
  Object.defineProperty(HTMLDialogElement.prototype, "close", {
    configurable: true,
    value(this: HTMLDialogElement) {
      this.removeAttribute("open");
      this.dispatchEvent(new Event("close"));
    },
  });
});

afterEach(() => {
  vi.restoreAllMocks();
  Object.defineProperty(HTMLDialogElement.prototype, "showModal", {
    configurable: true,
    value: originalShowModal,
  });
  Object.defineProperty(HTMLDialogElement.prototype, "close", {
    configurable: true,
    value: originalClose,
  });
});

function deferred<T>() {
  let resolve!: (value: T) => void;
  let reject!: (reason?: unknown) => void;
  const promise = new Promise<T>((nextResolve, nextReject) => {
    resolve = nextResolve;
    reject = nextReject;
  });
  return { promise, resolve, reject };
}

function inputOf(document: WorkingCopy): WorkingCopyInput {
  const { id, version, updatedAt, ...input } = document;
  void id;
  void version;
  void updatedAt;
  return input;
}

function Announcement() {
  const { requestAnnouncement } = useStudio();
  return <p data-testid="announcement" aria-live="polite">{requestAnnouncement}</p>;
}

function renderEditor(documentId: string, gateway: StudioGateway) {
  // CASE editors mount the Asset Picker (Task 10), which uses the throwing
  // `useStudioAssetGateway()` accessor -- a test harness that renders it must
  // supply `createAssetGateway`, the same as `StudioShell` always does.
  const assetGateway = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT)
    .input.createStudioAssetGateway();
  return render(
    <MemoryRouter initialEntries={[`/studio/documents/${documentId}/edit`]}>
      <StudioProvider
      createManagementGateway={createManagementGatewayStub} createGateway={() => gateway} createAssetGateway={() => assetGateway}>
        <DocumentEditorScreen documentId={documentId} />
        <Announcement />
      </StudioProvider>
    </MemoryRouter>,
  );
}

function DirtyNavigationProbe({ saved }: { saved: WorkingCopy }) {
  const { begin, updateDraft } = useStudioEditorSession();
  useEffect(() => {
    begin(saved, inputOf(saved));
    updateDraft({ ...inputOf(saved), title: "바뀐 제목" });
  }, [begin, saved, updateDraft]);
  return <GuardedStudioLink href="/studio/documents">작업본</GuardedStudioLink>;
}

async function getSavedDocument(gateway: StudioGateway) {
  return (await gateway.getDocument(FIXTURE_IDS.redisAdapterCase)).document;
}

describe("TechLog Studio save workflow", () => {
  it("shows save pending and success states and creates a fresh idempotency key for each command", async () => {
    const user = userEvent.setup();
    const base = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT).input.createStudioGateway();
    const first = deferred<void>();
    const keys: string[] = [];
    let calls = 0;
    const gateway = {
      ...base,
      saveDocument(...args: Parameters<StudioGateway["saveDocument"]>) {
        keys.push(args[2].idempotencyKey);
        calls += 1;
        return calls === 1
          ? first.promise.then(() => base.saveDocument(...args))
          : base.saveDocument(...args);
      },
    } satisfies StudioGateway;
    renderEditor(FIXTURE_IDS.redisAdapterCase, gateway);

    await user.clear(await screen.findByLabelText("제목"));
    await user.type(screen.getByLabelText("제목"), "첫 저장 제목");
    await user.click(screen.getByRole("button", { name: "저장" }));

    expect(screen.getByRole("status", { name: "편집 상태" })).toHaveTextContent("저장 중…");
    expect(screen.getByRole("button", { name: "저장 중…" })).toBeDisabled();

    first.resolve();
    await waitFor(() => expect(screen.getByRole("status", { name: "편집 상태" })).toHaveTextContent("저장됨"));
    expect(screen.getByTestId("announcement")).toHaveTextContent(
      "버전 5으로 저장했습니다.",
    );

    await user.clear(screen.getByLabelText("제목"));
    await user.type(screen.getByLabelText("제목"), "두 번째 저장 제목");
    await user.click(screen.getByRole("button", { name: "저장" }));
    await waitFor(() => expect(keys).toHaveLength(2));
    expect(keys[0]).toBeTruthy();
    expect(keys[1]).toBeTruthy();
    expect(keys[1]).not.toBe(keys[0]);
  });

  it("keeps the local draft and disables overwrite after a revision conflict", async () => {
    const user = userEvent.setup();
    const gateway = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT).input.createStudioGateway();
    renderEditor(FIXTURE_IDS.conflictCase, gateway);

    await user.clear(await screen.findByLabelText("제목"));
    await user.type(screen.getByLabelText("제목"), "내 충돌 초안");
    await user.click(screen.getByRole("button", { name: "저장" }));

    expect(await screen.findByRole("alert")).toHaveTextContent(
      "서버 최신본과 충돌했습니다. 이 세션에서는 다시 열어 비교해 주세요.",
    );
    expect(screen.getByRole("status", { name: "편집 상태" })).toHaveTextContent("저장 충돌");
    expect(screen.getByLabelText("제목")).toHaveValue("내 충돌 초안");
    expect(screen.getByRole("button", { name: "저장" })).toBeDisabled();
  });

  it("surfaces a save error and retries with a new user-command key without losing input", async () => {
    const user = userEvent.setup();
    const base = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT).input.createStudioGateway();
    const keys: string[] = [];
    const retryable = new StudioGatewayError({
      type: "https://techlog.local/problems/studio-unavailable",
      title: "STUDIO_UNAVAILABLE",
      status: 503,
      detail: "Studio가 잠시 응답하지 않습니다.",
      code: "STUDIO_UNAVAILABLE",
      retryable: true,
    });
    const saveDocument = vi
      .fn<StudioGateway["saveDocument"]>()
      .mockImplementationOnce((_id, _command, options) => {
        keys.push(options.idempotencyKey);
        return Promise.reject(retryable);
      })
      .mockImplementation((...args) => {
        keys.push(args[2].idempotencyKey);
        return base.saveDocument(...args);
      });
    renderEditor(FIXTURE_IDS.redisAdapterCase, { ...base, saveDocument });

    await user.clear(await screen.findByLabelText("제목"));
    await user.type(screen.getByLabelText("제목"), "오류 뒤에도 남는 초안");
    await user.click(screen.getByRole("button", { name: "저장" }));

    await waitFor(() => expect(screen.getByTestId("announcement")).toHaveTextContent(
      "Studio가 잠시 응답하지 않습니다.",
    ));
    expect(screen.getByLabelText("제목")).toHaveValue("오류 뒤에도 남는 초안");
    expect(screen.getByRole("status", { name: "편집 상태" })).toHaveTextContent("저장되지 않음");

    await user.click(screen.getByRole("button", { name: "저장" }));
    await waitFor(() => expect(screen.getByRole("status", { name: "편집 상태" })).toHaveTextContent("저장됨"));
    expect(saveDocument).toHaveBeenCalledTimes(2);
    expect(keys[1]).not.toBe(keys[0]);
  });
});

describe("TechLog Studio dirty navigation", () => {
  it("opens the source modal dialog, protects browser unload, and restores focus when staying", async () => {
    const user = userEvent.setup();
    const gateway = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT).input.createStudioGateway();
    const destinations: string[] = [];
    const saved = await getSavedDocument(gateway);
    render(
      <MemoryRouter initialEntries={[`/studio/documents/${saved.id}/edit`]}>
        <StudioProvider
      createManagementGateway={createManagementGatewayStub} createGateway={() => gateway} navigate={(href) => destinations.push(href)}>
          <DirtyNavigationProbe saved={saved} />
        </StudioProvider>
      </MemoryRouter>,
    );

    await waitFor(() => {
      const unload = new Event("beforeunload", { cancelable: true });
      window.dispatchEvent(unload);
      expect(unload.defaultPrevented).toBe(true);
    });

    const trigger = screen.getByRole("link", { name: "작업본" });
    trigger.focus();
    await user.click(trigger);
    const dialog = screen.getByRole("dialog", { name: "저장하지 않은 변경" });
    expect(dialog).toHaveAttribute("open");
    expect(screen.getByRole("button", { name: "이 페이지에 머무르기" })).toHaveFocus();
    expect(screen.getAllByRole("button").map((button) => button.textContent)).toEqual([
      "이 페이지에 머무르기",
      "변경 버리기",
      "저장 후 이동",
    ]);

    await user.click(screen.getByRole("button", { name: "이 페이지에 머무르기" }));
    await waitFor(() => expect(screen.queryByRole("dialog")).not.toBeInTheDocument());
    expect(trigger).toHaveFocus();
    expect(destinations).toEqual([]);
  });

  it("discards the draft and follows the pending internal destination", async () => {
    const user = userEvent.setup();
    const gateway = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT).input.createStudioGateway();
    const destinations: string[] = [];
    const saved = await getSavedDocument(gateway);
    render(
      <MemoryRouter initialEntries={[`/studio/documents/${saved.id}/edit`]}>
        <StudioProvider
      createManagementGateway={createManagementGatewayStub} createGateway={() => gateway} navigate={(href) => destinations.push(href)}>
          <DirtyNavigationProbe saved={saved} />
        </StudioProvider>
      </MemoryRouter>,
    );

    await user.click(screen.getByRole("link", { name: "작업본" }));
    await user.click(screen.getByRole("button", { name: "변경 버리기" }));
    expect(destinations).toEqual(["/studio/documents"]);
    expect(screen.queryByRole("dialog")).not.toBeInTheDocument();

    const unload = new Event("beforeunload", { cancelable: true });
    window.dispatchEvent(unload);
    expect(unload.defaultPrevented).toBe(false);
  });

  it("saves the draft before following the pending destination", async () => {
    const user = userEvent.setup();
    const base = createTechLogFeatureInstalledInput(MOCK_STUDIO_INSTALL_CONTEXT).input.createStudioGateway();
    const pending = deferred<WorkingCopyDetail>();
    let key = "";
    const gateway = {
      ...base,
      saveDocument(...args: Parameters<StudioGateway["saveDocument"]>) {
        key = args[2].idempotencyKey;
        return pending.promise;
      },
    } satisfies StudioGateway;
    const destinations: string[] = [];
    const saved = await getSavedDocument(base);
    render(
      <MemoryRouter initialEntries={[`/studio/documents/${saved.id}/edit`]}>
        <StudioProvider
      createManagementGateway={createManagementGatewayStub} createGateway={() => gateway} navigate={(href) => destinations.push(href)}>
          <DirtyNavigationProbe saved={saved} />
        </StudioProvider>
      </MemoryRouter>,
    );

    await user.click(screen.getByRole("link", { name: "작업본" }));
    await user.click(screen.getByRole("button", { name: "저장 후 이동" }));
    expect(screen.getByRole("button", { name: "저장 중" })).toBeDisabled();
    expect(destinations).toEqual([]);

    pending.resolve({
      ...(await base.getDocument(saved.id)),
      document: { ...saved, version: saved.version + 1, title: "바뀐 제목" },
    });
    await waitFor(() => expect(destinations).toEqual(["/studio/documents"]));
    expect(key).toBeTruthy();
    expect(screen.queryByRole("dialog")).not.toBeInTheDocument();
  });
});