#!/usr/bin/env node
/**
 * ObsiGate — JSDOM tests for the per-file chat panel (#169):
 * `frontend/js/filechat.js`.
 *
 * Covers:
 *   - `renderChatMessages()`: chronological render + empty state + escaping
 *   - `onChatMessage()`: live append when open on the same file, dedupe by id,
 *     no duplicate append when the panel shows another file
 *
 * Usage: node tests/frontend/filechat.test.mjs
 */

import { strict as assert } from "node:assert";
import { JSDOM } from "jsdom";
import { readFileSync } from "node:fs";
import { fileURLToPath, pathToFileURL } from "node:url";
import path from "node:path";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const dom = new JSDOM(
  `<!DOCTYPE html><html><body><div id="toast-container"></div></body></html>`,
  { url: "http://localhost/", pretendToBeVisual: true },
);

const w = dom.window;
globalThis.window = w;
globalThis.document = w.document;
globalThis.HTMLElement = w.HTMLElement;
globalThis.CSS = w.CSS || { escape: (s) => s };
globalThis.localStorage = w.localStorage;
globalThis.requestAnimationFrame = w.requestAnimationFrame || ((cb) => setTimeout(cb, 16));
globalThis.cancelAnimationFrame = w.cancelAnimationFrame || clearTimeout;
globalThis.sessionStorage = w.sessionStorage;
const JS_DIR = path.resolve(__dirname, "..", "..", "frontend", "js");
const LOCALES_DIR = path.resolve(__dirname, "..", "..", "frontend", "locales");

// Route fetch: locales from disk, auth 401, API chat endpoints from a stub map.
const apiStubs = new Map();
globalThis.fetch = (url) => {
  const u = String(url);
  if (u.includes("/static/locales/")) {
    const name = u.split("/").pop();
    try {
      const body = readFileSync(path.join(LOCALES_DIR, name), "utf-8");
      return Promise.resolve({ ok: true, status: 200, json: () => Promise.resolve(JSON.parse(body)) });
    } catch (_) {
      return Promise.resolve({ ok: false, status: 404, json: () => Promise.resolve({}) });
    }
  }
  if (u.includes("/api/auth/me")) {
    return Promise.resolve({ ok: false, status: 401, json: () => Promise.resolve({}) });
  }
  if (apiStubs.has(u)) {
    return Promise.resolve({ ok: true, status: 200, json: () => Promise.resolve(apiStubs.get(u)) });
  }
  return Promise.resolve({ ok: true, status: 200, json: () => Promise.resolve({ messages: [] }) });
};

const { initI18n } = await import(pathToFileURL(path.join(JS_DIR, "i18n.js")).href);
await initI18n();

const mod = await import("../../frontend/js/filechat.js");
const { renderChatMessages, onChatMessage, openFileChat, closeFileChat, toggleFileChat } = mod;

let pass = 0;
const cases = [];
function test(name, fn) {
  cases.push([name, fn]);
}

function makeList() {
  const list = document.createElement("div");
  list.className = "file-chat-list";
  return list;
}

test("renderChatMessages: empty/missing shows the empty state", async () => {
  const list = makeList();
  renderChatMessages(list, [], "bruno");
  assert.strictEqual(list.querySelectorAll(".file-chat-msg").length, 0);
  assert.strictEqual(list.querySelector(".file-chat-empty") !== null, true);
  renderChatMessages(list, undefined, "bruno");
  assert.strictEqual(list.querySelector(".file-chat-empty") !== null, true);
});

test("renderChatMessages: renders chronologically with mine class", async () => {
  const list = makeList();
  renderChatMessages(
    list,
    [
      { id: "1", user: "alice", text: "bonjour", ts: 1700000000 },
      { id: "2", user: "bruno", text: "salut !", ts: 1700000060 },
    ],
    "bruno",
  );
  const msgs = list.querySelectorAll(".file-chat-msg");
  assert.strictEqual(msgs.length, 2);
  assert.strictEqual(msgs[0].querySelector(".file-chat-user").textContent, "alice");
  assert.strictEqual(msgs[0].classList.contains("mine"), false);
  assert.strictEqual(msgs[1].classList.contains("mine"), true);
  assert.strictEqual(msgs[1].querySelector(".file-chat-body").textContent, "salut !");
});

test("renderChatMessages: message text is text (no HTML injection)", async () => {
  const list = makeList();
  renderChatMessages(list, [{ id: "1", user: "<img>", text: "<b>x</b>", ts: 1 }], "u");
  assert.strictEqual(list.querySelector(".file-chat-body").innerHTML, "&lt;b&gt;x&lt;/b&gt;");
  assert.strictEqual(list.querySelectorAll("b").length, 0);
});

test("onChatMessage: appends live message to the open panel", async () => {
  await openFileChat("V", "note.md");
  const panel = document.getElementById("file-chat-panel");
  assert.strictEqual(panel.classList.contains("hidden"), false);
  // Seed an empty state so we can assert its removal
  const list = panel.querySelector(".file-chat-list");
  renderChatMessages(list, [], "bruno");
  onChatMessage({ vault: "V", path: "note.md", message: { id: "m1", user: "alice", text: "oui", ts: 2 } });
  assert.strictEqual(list.querySelectorAll(".file-chat-msg").length, 1);
  assert.strictEqual(list.querySelector(".file-chat-empty"), null);
  // Same id again → deduped
  onChatMessage({ vault: "V", path: "note.md", message: { id: "m1", user: "alice", text: "oui", ts: 2 } });
  assert.strictEqual(list.querySelectorAll(".file-chat-msg").length, 1);
  closeFileChat();
  assert.strictEqual(document.getElementById("file-chat-panel").classList.contains("hidden"), true);
});

test("onChatMessage: ignores events for another file (no cross-file append)", async () => {
  await openFileChat("V", "note.md");
  const panel = document.getElementById("file-chat-panel");
  const list = panel.querySelector(".file-chat-list");
  renderChatMessages(list, [], "bruno");
  onChatMessage({ vault: "V", path: "OTHER.md", message: { id: "x", user: "alice", text: "no", ts: 3 } });
  assert.strictEqual(list.querySelectorAll(".file-chat-msg").length, 0);
  closeFileChat();
});

test("toggleFileChat: opens then closes on the same file", async () => {
  await toggleFileChat("V", "t.md");
  let panel = document.getElementById("file-chat-panel");
  assert.strictEqual(panel.classList.contains("hidden"), false);
  await toggleFileChat("V", "t.md");
  panel = document.getElementById("file-chat-panel");
  assert.strictEqual(panel.classList.contains("hidden"), true);
  closeFileChat();
});

// Sequential execution: each case depends on panel state left by the previous.
for (const [name, fn] of cases) {
  try {
    await fn();
    pass++;
    console.log(`  ✓ ${name}`);
  } catch (err) {
    console.error(`  ✗ ${name}\n    ${err.message}`);
    process.exitCode = 1;
  }
}
console.log(`\n${pass} passed`);