import { act } from "react";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { createRoot, type Root } from "react-dom/client";
import { PreferredSidebarSnapshotProvider } from "@/components/sidebar/preferred-sidebar-snapshot-context";
import type { SidebarInitialData } from "@/components/sidebar/types";
import { buildSidebarInitialData } from "@/lib/sidebar-data";
import type { DocumentRecord } from "@/lib/documents";
import { usePageHeadTitle } from "./use-page-head-title";

function buildDocument(overrides: Partial<DocumentRecord> = {}): DocumentRecord {
  return {
    access_scope: "private",
    id: "doc-1",
    workspace_id: "ws-1",
    title: "标题 A",
    parent_id: null,
    sort_order: 0,
    is_starred: false,
    is_template: false,
    created_at: "2026-04-21T00:00:00.000Z",
    updated_at: "2026-04-21T00:00:00.000Z",
    ...overrides,
  };
}

function buildSidebarData(documents: DocumentRecord[]): SidebarInitialData {
  return buildSidebarInitialData({
    activeWorkspaceId: "ws-1",
    workspaces: [],
    documents,
    trashedDocuments: [],
    mindmaps: [],
    mediaAssets: [],
    trashedMediaAssets: [],
    tables: [],
  });
}

function HookProbe(props: { documentId: string; fallbackTitle: string }) {
  const state = usePageHeadTitle(props);
  return (
    <>
      <div
        data-testid="page-head-title"
        data-display-title={state.displayTitle}
        data-committed-title={state.committedTitle}
        data-has-draft={state.hasDraft ? "1" : "0"}
      />
      <button type="button" data-testid="set-draft" onClick={() => state.setDraftTitle("  新标题  ")}>
        设草稿
      </button>
      <button type="button" data-testid="commit-persisted" onClick={() => state.commitPersistedTitle("新标题")}>
        提交持久化
      </button>
    </>
  );
}

describe("usePageHeadTitle", () => {
  let container: HTMLDivElement;
  let root: Root;

  beforeEach(() => {
    (globalThis as typeof globalThis & { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT =
      true;
    container = document.createElement("div");
    document.body.appendChild(container);
    root = createRoot(container);
  });

  afterEach(() => {
    act(() => {
      root.unmount();
    });
    container.remove();
  });

  it("应优先使用 live sidebar snapshot 中的标题作为 committed title", async () => {
    const snapshot = buildSidebarData([
      buildDocument({
        id: "doc-1",
        title: "树标题",
      }),
    ]);

    await act(async () => {
      root.render(
        <PreferredSidebarSnapshotProvider data={snapshot}>
          <HookProbe documentId="doc-1" fallbackTitle="SSR 标题" />
        </PreferredSidebarSnapshotProvider>,
      );
    });

    const probe = container.querySelector("[data-testid='page-head-title']");
    expect(probe?.getAttribute("data-committed-title")).toBe("树标题");
    expect(probe?.getAttribute("data-display-title")).toBe("树标题");
    expect(probe?.getAttribute("data-has-draft")).toBe("0");
  });

  it("应只把本地输入保留为短暂 draft，并在 live 标题追平后自动清空", async () => {
    const initialSnapshot = buildSidebarData([
      buildDocument({
        id: "doc-1",
        title: "旧标题",
      }),
    ]);

    await act(async () => {
      root.render(
        <PreferredSidebarSnapshotProvider data={initialSnapshot}>
          <HookProbe documentId="doc-1" fallbackTitle="SSR 标题" />
        </PreferredSidebarSnapshotProvider>,
      );
    });

    const setDraftButton = container.querySelector<HTMLButtonElement>("[data-testid='set-draft']");
    act(() => {
      setDraftButton?.click();
    });

    let probe = container.querySelector("[data-testid='page-head-title']");
    expect(probe?.getAttribute("data-display-title")).toBe("  新标题  ");
    expect(probe?.getAttribute("data-committed-title")).toBe("旧标题");
    expect(probe?.getAttribute("data-has-draft")).toBe("1");

    const commitPersistedButton = container.querySelector<HTMLButtonElement>("[data-testid='commit-persisted']");
    act(() => {
      commitPersistedButton?.click();
    });

    probe = container.querySelector("[data-testid='page-head-title']");
    expect(probe?.getAttribute("data-display-title")).toBe("新标题");
    expect(probe?.getAttribute("data-has-draft")).toBe("1");

    const syncedSnapshot = buildSidebarData([
      buildDocument({
        id: "doc-1",
        title: "新标题",
        updated_at: "2026-04-21T00:00:02.000Z",
      }),
    ]);

    await act(async () => {
      root.render(
        <PreferredSidebarSnapshotProvider data={syncedSnapshot}>
          <HookProbe documentId="doc-1" fallbackTitle="SSR 标题" />
        </PreferredSidebarSnapshotProvider>,
      );
    });

    probe = container.querySelector("[data-testid='page-head-title']");
    expect(probe?.getAttribute("data-display-title")).toBe("新标题");
    expect(probe?.getAttribute("data-committed-title")).toBe("新标题");
    expect(probe?.getAttribute("data-has-draft")).toBe("0");
  });
});