import type { Message } from "@langchain/langgraph-sdk";
import { describe, expect, it } from "@rstest/core";
import { createElement, type ImgHTMLAttributes } from "react";
import { renderToStaticMarkup } from "react-dom/server";

import { KnowledgeSourcesProvider } from "@/components/workspace/citations/knowledge-source";
import { MarkdownContent } from "@/components/workspace/messages/markdown-content";
import { createMarkdownLinkComponent } from "@/components/workspace/messages/markdown-link";
import { readKnowledgeSources } from "@/core/citations/sources";
import { I18nContext } from "@/core/i18n/context";
import { enUS } from "@/core/i18n/locales/en-US";

describe("shared knowledge citations through the Markdown pipeline", () => {
  const id = "a".repeat(32);
  const reference = `#knowledge-source-${id}`;
  const source = {
    id,
    provider: "lightrag",
    title: "Retrieved guide",
    excerpt: "Real evidence",
  };
  const sources = readKnowledgeSources([
    {
      type: "tool",
      content: `${reference}\nReal evidence`,
      artifact: { knowledge_sources_version: 1, knowledge_sources: [source] },
    },
  ]);

  it("keeps native RAGFlow snapshots readable through the same pipeline", () => {
    const nativeId = `${id}-1`;
    const message = {
      type: "tool",
      name: "knowledge_search",
      content: "retrieved",
      tool_call_id: "call",
      artifact: {
        knowledge_sources: {
          version: 1,
          sources: [
            {
              id: nativeId,
              provider: "ragflow",
              document_name: "Manual.pdf",
              dataset_name: "Engineering",
              text: "Limit: 42.",
              truncated: false,
              pages: [3],
            },
          ],
        },
      },
    } as unknown as Message;
    const html = renderToStaticMarkup(
      createElement(
        I18nContext.Provider,
        {
          value: { locale: "en-US", setLocale: () => undefined, t: enUS },
        },
        // Required children prop for the provider's createElement-based SSR.
        // eslint-disable-next-line react/no-children-prop
        createElement(KnowledgeSourcesProvider, {
          messages: [message],
          children: createElement(MarkdownContent, {
            content: `[citation:Manual](#knowledge-${nativeId})`,
            isLoading: false,
          }),
        }),
      ),
    );
    expect(html).toContain("<button");
    expect(html).toContain("Manual.pdf");
    expect(html).not.toContain("unavailable");
  });

  it.each([reference, `#user-content-knowledge-source-${id}`])(
    "resolves evidence after sanitization for %s",
    (href) => {
      const html = renderMarkdown(`[citation:Label](${href})`, false, {
        a: createMarkdownLinkComponent(undefined, sources),
      });
      expect(html).toContain("<button");
      expect(html).toContain(source.title);
      expect(html).not.toContain("unavailable");
      expect(html).not.toContain("href=");
    },
  );

  it.each([reference, "#knowledge-source-invalid"])(
    "keeps missing or malformed evidence inert for %s",
    (href) => {
      const html = renderMarkdown(`[citation:**Label**](${href})`, false);
      expect(html).toContain("Label");
      expect(html).not.toContain("<button");
      expect(html).not.toContain("href=");
      expect(html).not.toContain("unavailable");
    },
  );

  it("retains sanitizer protection on unrelated anchors and unsafe URLs", () => {
    const html = renderMarkdown(
      "[Section](#section) [citation:Unsafe](javascript:alert%281%29)",
      false,
    );
    expect(html).toContain('href="#user-content-section"');
    expect(html).not.toContain('href="javascript:');
  });
});

function renderMarkdown(
  content: string,
  isLoading: boolean,
  components?: Parameters<typeof MarkdownContent>[0]["components"],
) {
  return renderToStaticMarkup(
    createElement(
      I18nContext.Provider,
      {
        value: { locale: "en-US", setLocale: () => undefined, t: enUS },
      },
      createElement(MarkdownContent, { content, isLoading, components }),
    ),
  );
}

describe("MarkdownContent streaming code blocks", () => {
  it("renders fenced code without Streamdown highlighting while streaming", () => {
    const html = renderMarkdown(
      ["```html", '<main class="report">Hello</main>', "```"].join("\n"),
      true,
    );

    expect(html).toContain("data-streaming-code-block");
    expect(html).toContain('data-language="html"');
    expect(html).toContain(
      "&lt;main class=&quot;report&quot;&gt;Hello&lt;/main&gt;",
    );
    expect(html).not.toContain('data-streamdown="code-block"');
  });

  it("keeps inline code inline while streaming", () => {
    const html = renderMarkdown("Use `const answer = 42` here.", true);

    expect(html).toContain('data-streaming-inline-code="true"');
    expect(html).not.toContain("data-streaming-code-block");
  });

  it("keeps an unlabeled single-line fence as a block while streaming", () => {
    const html = renderMarkdown(["```", "x", "```"].join("\n"), true);

    expect(html).toContain("data-streaming-code-block");
    expect(html).not.toContain('data-streaming-inline-code="true"');
  });

  it("restores Streamdown code rendering after streaming finishes", () => {
    const html = renderMarkdown(
      ["```typescript", "const answer: number = 42;", "```"].join("\n"),
      false,
    );

    expect(html).toContain('data-streamdown="code-block"');
    expect(html).not.toContain("data-streaming-code-block");
  });

  it("preserves custom non-code renderers while streaming", () => {
    const html = renderMarkdown(
      "[Docs](https://example.com)\n\n![Chart](chart.png)",
      true,
      {
        a: ({ children, href }) =>
          createElement("a", { "data-custom-link": true, href }, children),
        img: (props: ImgHTMLAttributes<HTMLImageElement>) =>
          createElement("img", { ...props, "data-custom-image": true }),
      },
    );

    expect(html).toContain('data-custom-link="true"');
    expect(html).toContain('data-custom-image="true"');
  });

  it("preserves a caller-provided code renderer while streaming", () => {
    const html = renderMarkdown(
      ["```html", "<main />", "```"].join("\n"),
      true,
      {
        code: ({ children }) =>
          createElement("code", { "data-custom-code": true }, children),
      },
    );

    expect(html).toContain('data-custom-code="true"');
    expect(html).toContain("data-streaming-code-block");
  });

  it("does not paint an initial large streaming chunk all at once", () => {
    const content = "x".repeat(120);

    expect(renderMarkdown(content, true)).not.toContain(content);
    expect(renderMarkdown(content, false)).toContain(content);
  });
});

describe("MarkdownContent streaming animation", () => {
  it("uses Streamdown animation only for newly streamed words", () => {
    const html = renderMarkdown("Hello streaming world", true);

    expect(html).toContain("data-sd-animate");
    expect(html).toContain("--sd-animation:sd-fadeIn");
    expect(html).toContain("--sd-duration:200ms");
    expect(html).not.toContain("--sd-delay");
    expect(html).not.toContain("animate-fade-in");
  });

  it("does not animate completed markdown", () => {
    const html = renderMarkdown("Hello completed world", false);

    expect(html).not.toContain("data-sd-animate");
  });
});

describe("MarkdownContent streaming lists", () => {
  it("hides a trailing empty ordered-list item until its content arrives", () => {
    const html = renderMarkdown(["1. First", "", "2."].join("\n"), true);

    expect(html).toContain('data-streaming-list-item="true"');
    expect(html).toContain('data-streamdown="list-item" hidden=""');
  });

  it("hides a trailing empty unordered-list item until its content arrives", () => {
    const html = renderMarkdown("-", true);

    expect(html).toContain('data-streamdown="unordered-list"');
    expect(html).toContain('data-streamdown="list-item" hidden=""');
    expect(html).not.toContain('data-streaming-list-item="true"');
  });

  it("keeps a mid-list empty item visible so ordered counters stay stable", () => {
    const html = renderMarkdown(
      ["1. First", "2.", "3. Third"].join("\n"),
      true,
    );
    const listItems = html.match(/<li[^>]*>/g);

    expect(listItems).toHaveLength(3);
    expect(listItems?.[1]).not.toContain("hidden");
    expect(html).not.toContain('hidden=""');
  });

  it("marks nested list items without hiding existing content", () => {
    const html = renderMarkdown(
      ["1. Parent", "   - Nested child"].join("\n"),
      true,
    );

    expect(html.match(/data-streaming-list-item="true"/g)).toHaveLength(2);
    expect(html).not.toContain('hidden=""');
  });

  it("leaves completed list markup outside streaming treatment", () => {
    const html = renderMarkdown(["1. First", "", "2."].join("\n"), false);

    expect(html).toContain('data-streamdown="ordered-list"');
    expect(html).not.toContain("data-streaming-list-item");
    expect(html).not.toContain('hidden=""');
  });
});

describe("MarkdownContent strikethrough", () => {
  it("preserves single tildes in temperature ranges", () => {
    const html = renderMarkdown("周六23~30℃；周日22~30℃", false);

    expect(html).toContain("周六23~30℃；周日22~30℃");
    expect(html).not.toContain("<del>");
  });

  it("continues to render double-tilde strikethrough", () => {
    const html = renderMarkdown("状态：~~已取消~~", false);

    expect(html).toContain("<del>已取消</del>");
  });
});