import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";

import { plainParagraphs } from "../src/components/chat-message-paragraphs.ts";

const readProjectFile = (path: string) => readFileSync(new URL(`../${path}`, import.meta.url), "utf8");
const contentSource = readProjectFile("src/components/chat-message-content.tsx");
const markdownViewSource = readProjectFile("src/components/chat-markdown-view.tsx");
const messageRowSource = readProjectFile("src/components/chat-message-row.tsx");
const activitySource = readProjectFile("src/components/agent-activity-status.tsx");
const prefetchSource = readProjectFile("src/components/chat-chunk-prefetch.ts");

test("the markdown pipeline is split out of the initial chat bundle", () => {
  // Given: the chat surface statically imports the message content component.
  assert.doesNotMatch(contentSource, /^import .*"react-markdown"/m);
  assert.doesNotMatch(contentSource, /^import .*"remark-gfm"/m);

  // Then: the renderer only arrives through a dynamic import.
  assert.match(contentSource, /import\("@\/components\/chat-markdown-view"\)/);
  assert.match(contentSource, /markdownRenderer = module\.renderChatMarkdown/);
  assert.match(markdownViewSource, /^import ReactMarkdown, \{ type Components \} from "react-markdown";$/m);
  assert.match(markdownViewSource, /^import remarkGfm from "remark-gfm";$/m);
  assert.match(markdownViewSource, /remarkPlugins=\{\[remarkGfm\]\}/);
  assert.match(markdownViewSource, /skipHtml/);
});

test("the pre-markdown fallback renders prose but never raw markdown", () => {
  // Given: a reply that carries markdown syntax.
  assert.equal(plainParagraphs("**重点**在这里"), null);
  assert.equal(plainParagraphs("## 阶段判断"), null);
  assert.equal(plainParagraphs("- 第一点"), null);
  assert.equal(plainParagraphs("1. 第一点"), null);
  assert.equal(plainParagraphs("| 宫位 | 行星 |"), null);
  assert.equal(plainParagraphs("`Vimshottari`"), null);
  assert.equal(plainParagraphs("参见 https://example.com"), null);
  assert.equal(plainParagraphs("> 引用"), null);
  assert.equal(plainParagraphs("[链接](/x)"), null);
  assert.equal(plainParagraphs("行尾软换行  \n下一行"), null);

  // Then: only plain prose takes the fallback path, split exactly like CommonMark.
  assert.deepEqual(plainParagraphs("第一段。\n\n第二段。"), ["第一段。", "第二段。"]);
  assert.deepEqual(plainParagraphs("一行\n下一行"), ["一行\n下一行"]);
  assert.deepEqual(plainParagraphs("只有一段。"), ["只有一段。"]);

  // And: one stable wrapper serves both paths, so no styling or caret is lost on upgrade.
  assert.equal(contentSource.match(/className="message-markdown"/g)?.length, 1);
  assert.match(contentSource, /className="message-answer"/);
  assert.match(contentSource, /TechniqueAuditDisclosure/);
  assert.match(contentSource, /<p key=\{index\}>\{paragraph\}<\/p>/);
  assert.match(contentSource, /plainParagraphs\(spoken\) \?\? \[\]/);
});

test("gsap loads on demand while keeping the reduced-motion gate", () => {
  // Given: the animation engine is no longer part of the static import graph.
  assert.doesNotMatch(messageRowSource, /^import .*from "gsap"/m);
  assert.doesNotMatch(messageRowSource, /@gsap\/react/);
  assert.match(messageRowSource, /import\("gsap"\)/);

  // Then: reduced-motion users never request it, and the tween contract is unchanged.
  assert.match(messageRowSource, /prefers-reduced-motion: reduce/);
  assert.match(messageRowSource, /prefers-reduced-motion: no-preference/);
  assert.match(messageRowSource, /gsap\.matchMedia\(\)/);
  assert.match(messageRowSource, /duration: 0\.18/);
  assert.match(messageRowSource, /clearProps: "opacity,transform,visibility"/);

  // And: a row that mounts before the chunk lands renders unanimated instead of flashing.
  assert.match(messageRowSource, /if \(!gsapCore\) \{/);
  assert.match(messageRowSource, /useEntryEffect\(\(\) => \{/);
});

test("the thinking orb loads on demand behind a same-size placeholder", () => {
  // Given: only the state type is imported at build time.
  assert.doesNotMatch(activitySource, /^import \{ ThinkingOrb/m);
  assert.match(activitySource, /^import type \{ OrbState \} from "thinking-orbs";$/m);
  assert.match(activitySource, /dynamic\(async \(\) => \(await importThinkingOrb\(\)\)\.ThinkingOrb/);
  assert.match(activitySource, /ssr: false/);

  // Then: the placeholder reserves the exact 20px orb box so the row cannot shift.
  assert.match(activitySource, /loading: \(\) => \(/);
  assert.match(activitySource, /height: 20, width: 20/);
  assert.match(activitySource, /flex: "0 0 auto"/);

  // And: the live region and the decorative marking survive.
  assert.match(activitySource, /role="status"/);
  assert.match(activitySource, /<ThinkingOrb aria-hidden="true" state=\{state\} size=\{20\}/);
});

test("deferred chat chunks are requested during idle time after first paint", () => {
  assert.match(prefetchSource, /if \(typeof window === "undefined"\) return;/);
  assert.match(prefetchSource, /window\.requestIdleCallback\(request, \{ timeout: 2_000 \}\)/);
  assert.match(prefetchSource, /window\.setTimeout\(request, 300\)/);
  assert.match(contentSource, /prefetchOnIdle\(loadMarkdownRenderer\)/);
  assert.match(activitySource, /prefetchOnIdle\(importThinkingOrb\)/);
  assert.match(messageRowSource, /if \(motionPreferred\(\)\) prefetchOnIdle\(loadGsap\)/);
});