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

import {
  chatReplyAnnouncement,
  chatReplyAnnouncer,
  type ChatReplyPhase,
} from "../src/lib/chat-reply-announcement.ts";

const pageSource = readFileSync(new URL("../src/app/page.tsx", import.meta.url), "utf8");
const membershipSource = readFileSync(new URL("../src/app/membership/page.tsx", import.meta.url), "utf8");
const noticeSource = readFileSync(new URL("../src/lib/chat-notice.ts", import.meta.url), "utf8");
const announcementSource = readFileSync(new URL("../src/lib/chat-reply-announcement.ts", import.meta.url), "utf8");

function sourceBetween(source: string, startMarker: string, endMarker: string) {
  const start = source.indexOf(startMarker);
  const end = source.indexOf(endMarker, start);
  assert.notEqual(start, -1);
  assert.notEqual(end, -1);
  return source.slice(start, end);
}

test("in-app destinations navigate client-side so the chat survives the round trip", () => {
  // Given: the chat page now owns a router.
  assert.match(pageSource, /import \{ useRouter \} from "next\/navigation"/);
  assert.match(pageSource, /const router = useRouter\(\)/);

  // Then: every same-app destination the user comes back from is a soft push.
  assert.match(pageSource, /onOpenReports=\{\(\) => router\.push\("\/reports"\)\}/);
  assert.match(pageSource, /onOpenRedeem=\{\(\) => router\.push\(membershipHref\("account-menu"\)\)\}/);
  assert.match(pageSource, /onClick=\{\(\) => router\.push\(membershipHref\("credits"\)\)\}/);
  assert.match(pageSource, /router\.push\(membershipHref\("insufficient-credits"\)\)/);
  assert.match(pageSource, /if \(response\.status === 402\) router\.push\(membershipHref\("insufficient-credits"\)\)/);

  // And: none of them fall back to a document load.
  assert.doesNotMatch(pageSource, /window\.location\.assign\("\/reports"\)/);
  assert.doesNotMatch(pageSource, /window\.location\.assign\(membershipHref\(/);
});

test("both insufficient-credit paths are soft so the typed question is not thrown away", () => {
  const creditGuard = sourceBetween(
    pageSource,
    "if (account.credits <= 0 && !account.activeSubscription) {",
    "const [year, month, day]",
  );
  const sendSource = pageSource.slice(pageSource.indexOf("  async function send("));

  // Given: the pre-flight guard runs before send() clears the composer draft.
  assert.match(creditGuard, /router\.push\(membershipHref\("insufficient-credits"\)\)/);
  assert.doesNotMatch(creditGuard, /window\.location/);
  const creditPush = sendSource.indexOf('router.push(membershipHref("insufficient-credits"))');
  const sendClearsComposer = sendSource.indexOf("conversationAnchor.anchorToLatest();\n      setDraft(\"\");");
  assert.ok(creditPush >= 0 && sendClearsComposer > creditPush);
  assert.equal(pageSource.match(/router\.push\(membershipHref\("insufficient-credits"\)\)/g)?.length, 2);
});

test("auth redirects stay hard document loads so stale session state cannot survive", () => {
  // Given: a 401 means the client is holding a session the server has rejected.
  // Then: every login redirect is a deliberate full page load, not router.push.
  assert.match(pageSource, /function redirectToLogin\(\): never \{\n  window\.location\.replace\("\/login"\);/);
  assert.equal(pageSource.match(/window\.location\.assign\("\/login"\)/g)?.length, 4);
  assert.equal(pageSource.match(/window\.location\.replace\("\/login"\)/g)?.length, 1);
  assert.doesNotMatch(pageSource, /router\.push\("\/login"\)/);
  assert.doesNotMatch(pageSource, /router\.replace\("\/login"\)/);

  // And: the login redirect after sign-out drops the whole React tree with the session.
  const signOut = sourceBetween(pageSource, "async function signOut()", "function chooseSuggestedQuestion");
  assert.match(signOut, /await selfHostedOtpActions\.signOut\(\);\n\s*window\.location\.assign\("\/login"\)/);

  // And: the sibling membership surface keeps the same precedent.
  assert.match(membershipSource, /import \{ useSearchParams \} from "next\/navigation"/);
  assert.equal(membershipSource.match(/window\.location\.assign\("\/login"\)/g)?.length, 3);
  assert.doesNotMatch(membershipSource, /router\.(push|replace)\("\/login"\)/);
});

test("bootstrap failure retries with a hard reload because refresh cannot rerun client bootstrap", () => {
  // Given: the account, catalog and sessions are fetched from a mount-once client effect,
  // which router.refresh() would not re-run because it never remounts the client tree.
  assert.match(pageSource, /onClick=\{\(\) => window\.location\.reload\(\)\}>重试<\/button>/);
  assert.doesNotMatch(pageSource, /router\.refresh\(\)/);
  assert.match(pageSource, /void loadCloudData\(\);\n\s*return \(\) => \{[\s\S]*?\n  \}, \[\]\);/);
});

test("the streaming reply announces state transitions, never streamed deltas", () => {
  // Given: one page-level status region outside every aria-busy subtree.
  assert.match(
    pageSource,
    /<main className="chat-app">\n\s*<span className="sr-only" role="status" aria-live="polite" aria-atomic="true">\{replyAnnouncement\}<\/span>/,
  );

  // Then: the region is fed a phase-derived string, not the streaming text.
  assert.match(pageSource, /const replyAnnouncement = chatReplyAnnouncement\(replyPhase, activeReplyOutcome\?\.replyOrdinal \?\? 0\)/);
  assert.doesNotMatch(announcementSource, /activeStreamingText|streamingReply|answer\.delta/);
  assert.doesNotMatch(pageSource, /aria-live=[^>]*\{activeStreamingText/);
  assert.doesNotMatch(pageSource, /\{activeStreamingText\}<\/span>/);

  // And: the old start-only region that lived inside the busy message list is gone.
  assert.doesNotMatch(pageSource, /<span className="sr-only" aria-live="polite">\{isLoading \? "Jyotisha 正在回答" : ""\}<\/span>/);
  assert.match(pageSource, /<div className="message-list" aria-busy=\{isLoading\}>\n\s*\{chatMessageViews\(/);
});

test("the reply phase covers start, completion and every terminal state", () => {
  const phaseDerivation = sourceBetween(pageSource, "const replyPhase: ChatReplyPhase = isLoading", "const accountId =");

  assert.match(phaseDerivation, /consultationPhase === "recovering" \? "recovering" : "generating"/);
  assert.match(phaseDerivation, /activeReplyOutcome\?\.phase \?\? "idle"/);
  assert.match(pageSource, /const activeReplyOutcome = replyOutcome && replyOutcome\.sessionId === activeSession\?\.id \? replyOutcome : null/);

  // Given: each terminal transition records its outcome from an event handler, not an effect.
  assert.match(pageSource, /setReplyOutcome\(\{\n\s*sessionId,\n\s*phase: "completed",\n\s*replyOrdinal: completedSession\.messages\.filter\(\(message\) => message\.role === "assistant"\)\.length,\n\s*\}\)/);
  assert.match(pageSource, /setReplyOutcome\(\{ sessionId, phase: "failed", replyOrdinal: 0 \}\)/);
  assert.match(pageSource, /setReplyOutcome\(\{ sessionId: pending\.sessionId, phase: "stopped", replyOrdinal: 0 \}\)/);

  // And: a new question clears the previous outcome so a stale reply is never re-announced.
  assert.match(pageSource, /setRequestError\(null\);\n\s*setReplyOutcome\(null\);\n\s*if \(!resuming\) \{\n\s*setComposerNotice\(""\)/);
});

test("completion is announced with where to find the reply, and start says one is coming", () => {
  assert.equal(chatReplyAnnouncement("generating", 0), "Jyotisha 正在回答，完成后会提示你阅读。");
  assert.equal(
    chatReplyAnnouncement("completed", 3),
    "Jyotisha 已回答完毕，第 3 条回答已显示在对话区末尾，可以开始阅读。",
  );

  // Given: two consecutive replies would otherwise repeat identical text and stay unspoken.
  assert.notEqual(chatReplyAnnouncement("completed", 3), chatReplyAnnouncement("completed", 4));

  // And: every announcement is simplified Chinese in the existing product voice.
  for (const phase of ["generating", "completed"] as const) {
    const text = chatReplyAnnouncement(phase, 1);
    assert.match(text, /^Jyotisha /);
    assert.doesNotMatch(text.replace("Jyotisha", ""), /[A-Za-z]/);
  }
});

test("toast-owned and alert-owned events are deliberately silent in the status region", () => {
  // Given: sonner mounts its own polite live region for every chat notice.
  assert.match(noticeSource, /import \{ toast \} from "sonner"/);

  // Then: stop, recovery and disconnect stay with the toast instead of double-announcing.
  assert.equal(chatReplyAnnouncer("stopped"), "chat_notice_toast");
  assert.equal(chatReplyAnnouncer("recovering"), "chat_notice_toast");
  assert.equal(chatReplyAnnouncement("stopped", 0), "");
  assert.equal(chatReplyAnnouncement("recovering", 0), "");

  // And: a failed reply belongs to the assertive conversation alert, not the polite region.
  assert.equal(chatReplyAnnouncer("failed"), "conversation_alert");
  assert.equal(chatReplyAnnouncement("failed", 0), "");
  assert.match(pageSource, /<p className="error-message" role="alert">\{activeError\}<\/p>/);

  // And: only the two live-region phases ever produce spoken text.
  const phases: readonly ChatReplyPhase[] = ["idle", "generating", "recovering", "completed", "stopped", "failed"];
  const spoken = phases.filter((phase) => chatReplyAnnouncement(phase, 1) !== "");
  assert.deepEqual(spoken, ["generating", "completed"]);
});

test("the recovered background reply tells the reader where it landed", () => {
  assert.equal(pageSource.match(/回答已恢复，已显示在对话区末尾。/g)?.length, 2);
  assert.doesNotMatch(pageSource, /setComposerNotice\("回答已恢复。"\)/);
});

test("assertive announcement is reserved for genuine errors", () => {
  // Given: the bootstrap failure screen is the only assertive surface on the page.
  assert.match(pageSource, /<main className="app-loading app-loading-error">\n\s*<div className="app-loading-content" role="alert">/);
  assert.doesNotMatch(pageSource, /aria-live="assertive"/);

  // And: the still-loading screen stays polite and marks itself busy.
  assert.match(pageSource, /<main className="app-loading" aria-busy="true" aria-live="polite">/);
});

test("the onboarding typewriter announces the finished line once instead of each character", () => {
  const onboardingMessage = sourceBetween(pageSource, "function OnboardingChatMessage(", "function isProfileComplete(");

  // Given: the visibly typed text is hidden from assistive technology.
  assert.match(onboardingMessage, /className=\{`onboarding-stream[^`]*`\} aria-hidden="true"/);

  // Then: only the completed line reaches the polite region, as one atomic unit.
  assert.match(
    onboardingMessage,
    /<span className="sr-only" role="status" aria-live="polite" aria-atomic="true">\{length >= text\.length \? text : ""\}<\/span>/,
  );
  assert.doesNotMatch(onboardingMessage, /aria-live="polite">\{visibleText\}|aria-live="polite">\{protectedVisibleText\}/);
  assert.doesNotMatch(onboardingMessage, /aria-busy/);
});

test("aria-busy marks the updating message list without swallowing the status region", () => {
  // Given: the activity status inside a streamed row is itself a role="status" region.
  const activitySource = readFileSync(
    new URL("../src/components/agent-activity-status.tsx", import.meta.url),
    "utf8",
  );
  assert.match(activitySource, /role="status"/);

  // Then: aria-busy on the message list suppresses that per-phase chatter while streaming,
  // and the reply status region sits outside it so completion is still spoken.
  assert.match(pageSource, /<div className="message-list" aria-busy=\{isLoading\}>/);
  const messageList = sourceBetween(pageSource, '<div className="message-list" aria-busy={isLoading}>', "</div>");
  assert.doesNotMatch(messageList, /aria-live|role="status"/);
});

test("the jump-to-latest control stays keyboard reachable and labelled", () => {
  const jumpControl = sourceBetween(pageSource, "{jumpToLatestVisible && (", "</button>");
  const buttonTag = sourceBetween(jumpControl, "<button", ">");

  // Given: a real button in document order, never removed from the tab sequence.
  assert.match(jumpControl, /<button\b/);
  assert.match(buttonTag, /type="button"/);
  assert.doesNotMatch(buttonTag, /tabIndex/);
  assert.doesNotMatch(buttonTag, /aria-hidden/);
  assert.doesNotMatch(buttonTag, /disabled/);

  // And: a visible label, a matching accessible name, a focus ring and a 44px target.
  assert.match(jumpControl, /aria-label="跳到最新"/);
  assert.match(jumpControl, /\n\s*跳到最新\n/);
  assert.match(jumpControl, /focus-visible:ring-3/);
  assert.match(jumpControl, /min-h-11/);
  assert.match(jumpControl, /min-w-11/);

  // And: the icon is decorative, and pointer-events never gate keyboard activation.
  assert.match(jumpControl, /<ArrowDown aria-hidden="true"/);
  assert.match(jumpControl, /pointer-events-auto/);
  assert.match(jumpControl, /onClick=\{conversationAnchor\.anchorToLatest\}/);
});