#!/usr/bin/env node
/**
 * ObsiGate — JSDOM integration tests for the Excel viewer (ROADMAP #153 P0).
 *
 * Loads the real viewer.js module and drives renderXlsxViewer():
 *  - A1 : `xlsx_lossy_features` renders a warning banner; a save on such a
 *         workbook gets 409 `xlsx_lossy_content`, asks for confirmation and
 *         retries with `force: true` (or gives up when refused);
 *  - A4 : the f(x) toggle flips `allow_formula` in the save payload.
 *  - A8 : a sheet bigger than the render caps shows the truncation notice.
 *  - A9bis : the tail of a truncated sheet is fetched window by window from
 *         GET …/xlsx/sheet (scroll sentinel + click), and the appended rows are
 *         editable like the initial ones.
 *
 * Usage: node tests/frontend/xlsx-viewer.test.mjs
 */

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

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const REPO_ROOT = path.resolve(__dirname, "..", "..");

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

const w = dom.window;
globalThis.window = w;
globalThis.document = w.document;
globalThis.DOMParser = w.DOMParser;
globalThis.HTMLElement = w.HTMLElement;
globalThis.Element = w.Element;
globalThis.Node = w.Node;
globalThis.Event = w.Event;
globalThis.CustomEvent = w.CustomEvent;
globalThis.MouseEvent = w.MouseEvent;
globalThis.localStorage = w.localStorage;
globalThis.sessionStorage = w.sessionStorage;
globalThis.requestAnimationFrame = (cb) => setTimeout(() => cb(Date.now()), 0);
Object.defineProperty(globalThis, "navigator", {
  value: w.navigator,
  configurable: true,
  writable: true,
});

// ── fetch / confirm doubles ─────────────────────────────────────────────────
let calls = [];
let nextResponse = () => ({ ok: true, status: 200, body: { status: "ok" } });
let confirmAnswer = true;
let confirmCalls = 0;
// Every confirm() prompt is captured so the tests can assert on its text.
let confirmPrompts = [];

const FR = JSON.parse(
  readFileSync(path.join(REPO_ROOT, "frontend", "locales", "fr.json"), "utf8")
);

globalThis.fetch = async (url, opts = {}) => {
  // The i18n bootstrap fetches the locale files: serve the real FR one so the
  // assertions run on the shipped strings, not on raw keys.
  if (url.includes("/static/locales/")) {
    return { ok: true, status: 200, json: async () => FR };
  }
  calls.push({ url, body: opts.body ? JSON.parse(opts.body) : null });
  const res = nextResponse(url, opts);
  return {
    ok: res.ok,
    status: res.status,
    json: async () => res.body,
  };
};
globalThis.confirm = (msg) => { confirmCalls++; confirmPrompts.push(msg); return confirmAnswer; };
w.confirm = globalThis.confirm;

// ── Helpers ─────────────────────────────────────────────────────────────────
let testCount = 0;
let passCount = 0;

async function test(name, fn) {
  testCount++;
  calls = [];
  confirmCalls = 0;
  confirmPrompts = [];
  confirmAnswer = true;
  apiQueue = [];
  nextResponse = () => {
    if (apiQueue.length) return apiQueue.shift();
    return { ok: true, status: 200, body: { status: "ok" } };
  };
  try {
    await fn();
    console.log(`  ✓ ${name}`);
    passCount++;
  } catch (e) {
    console.log(`  ✗ ${name}`);
    console.log(`    ${e.message}`);
    if (e.stack) console.log(`    ${e.stack.split("\n").slice(1, 3).join("\n    ")}`);
  }
}

const { renderXlsxViewer } = await import(
  pathToFileURL(path.join(REPO_ROOT, "frontend", "js", "viewer.js")).href
);
// Load the FR catalog so t() resolves the real strings.
const { initI18n } = await import(
  pathToFileURL(path.join(REPO_ROOT, "frontend", "js", "i18n.js")).href
);
await initI18n();

const sheetHtml = (value) =>
  '<div class="csv-table-wrapper"><table class="csv-table xlsx-table">' +
  '<thead><tr><th class="xlsx-corner"></th><th>A</th></tr></thead><tbody>' +
  `<tr><th class="xlsx-rownum">1</th><td data-cell="A1">${value}</td></tr>` +
  "</tbody></table></div>";

// The JSDOM fetch double serves locale files; everything else is a recorded
// API call answered by `nextResponse`. `apiQueue` lets a test script the
// successive windows a lazy-loading sheet will request.
let apiQueue = [];

function mount({ lossy = [], sheet = {} } = {}) {
  const area = document.getElementById("content-area");
  area.innerHTML = "";
  renderXlsxViewer(area, {
    vault: "V",
    path: "data.xlsx",
    is_xlsx: true,
    xlsx_sheets: [{ name: "Feuille1", html: sheetHtml("100"), ...sheet }],
    xlsx_lossy_features: lossy,
  });
  return area;
}

/** Mount a sheet flagged truncated so wireLazyRows() arms the footnote. */
function mountTruncated({ total = 520, rows = 1 } = {}) {
  return mount({
    sheet: { rows, cols: 3, total_rows: total, total_cols: 3, max_rows: 500, max_cols: 40, truncated: total > 500 },
  });
}

/** Mark a cell dirty the way a user edit would. */
function editCell(area, ref, text) {
  const td = area.querySelector(`td[data-cell="${ref}"]`);
  td.textContent = text;
  td.dispatchEvent(new w.Event("input", { bubbles: true }));
  return td;
}

const lossyError = {
  ok: false,
  status: 409,
  body: {
    detail: "Saving this workbook would drop features…",
    code: "xlsx_lossy_content",
    details: { features: ["slicers"] },
  },
};

console.log("\n── xlsx viewer JSDOM integration tests (#153 P0) ──\n");

// ── A1 — warning banner ─────────────────────────────────────────────────────

await test("no banner when the workbook has nothing at risk", () => {
  const area = mount();
  assert.equal(area.querySelector(".xlsx-warning"), null);
});

await test("banner lists every lossy feature reported by the backend", () => {
  const area = mount({ lossy: ["cached_values", "slicers"] });
  const banner = area.querySelector(".xlsx-warning");
  assert.ok(banner, "banner absent");
  const tags = [...banner.querySelectorAll(".xlsx-warning-tag")].map((n) => n.textContent);
  assert.equal(tags.length, 2);
  assert.ok(tags.includes(FR["xlsx.feature_cached_values"]), tags.join("|"));
  assert.ok(tags.includes(FR["xlsx.feature_slicers"]), tags.join("|"));
  assert.ok(banner.textContent.includes(FR["xlsx.lossy_title"]));
  assert.ok(banner.textContent.includes(FR["xlsx.lossy_hint"]));
});

await test("formula toggle is present and starts unpressed", () => {
  const area = mount();
  const btn = area.querySelector("#xlsx-formula-btn");
  assert.ok(btn);
  assert.equal(btn.getAttribute("aria-pressed"), "false");
  assert.equal(btn.getAttribute("title"), FR["xlsx.formula_toggle_title"]);
});

// ── Save payload ────────────────────────────────────────────────────────────

await test("save sends one PUT per dirty sheet with the cell map", async () => {
  const area = mount();
  editCell(area, "A1", "250");
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 0));
  assert.equal(calls.length, 1);
  assert.match(calls[0].url, /\/api\/file\/V\/xlsx\/save\?path=data\.xlsx/);
  assert.deepEqual(calls[0].body.cells, { A1: "250" });
  assert.equal(calls[0].body.sheet, "Feuille1");
  assert.equal(calls[0].body.force, false);
  assert.equal(calls[0].body.allow_formula, false);
});

await test("save button stays disabled when nothing is dirty", async () => {
  const area = mount();
  const btn = area.querySelector("#xlsx-save-btn");
  assert.equal(btn.disabled, true);
  btn.click();
  await new Promise((r) => setTimeout(r, 0));
  assert.equal(calls.length, 0);
});

// ── A4 — formula toggle ─────────────────────────────────────────────────────

await test("f(x) toggle flips allow_formula on the next save", async () => {
  const area = mount();
  area.querySelector("#xlsx-formula-btn").click();
  assert.equal(area.querySelector("#xlsx-formula-btn").getAttribute("aria-pressed"), "true");
  editCell(area, "A1", "=B1*2");
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 0));
  assert.equal(calls[0].body.allow_formula, true);
});

// ── A1 — 409 confirmation & force retry ─────────────────────────────────────

await test("409 xlsx_lossy_content asks once then retries with force", async () => {
  const area = mount({ lossy: ["slicers"] });
  editCell(area, "A1", "250");
  nextResponse = () => (calls.length === 1 ? lossyError : { ok: true, status: 200, body: {} });
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 10));
  assert.equal(confirmCalls, 1);
  assert.equal(calls.length, 2);
  assert.equal(calls[0].body.force, false);
  assert.equal(calls[1].body.force, true);
  // The prompt names the features the backend reported.
  assert.ok(confirmPrompts[0].includes(FR["xlsx.feature_slicers"]), confirmPrompts[0]);
  // Save succeeded → cells are no longer dirty.
  assert.equal(area.querySelectorAll("td.xlsx-dirty").length, 0);
});

await test("confirming once is enough for the following saves", async () => {
  const area = mount({ lossy: ["cached_values"] });
  editCell(area, "A1", "1");
  nextResponse = () => (calls.length === 1 ? lossyError : { ok: true, status: 200, body: {} });
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 10));
  editCell(area, "A1", "2");
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 10));
  assert.equal(confirmCalls, 1, "the user is not asked twice");
  assert.equal(calls.length, 3);
  assert.equal(calls[2].body.force, true);
});

await test("refusing the confirmation writes nothing and keeps the cells dirty", async () => {
  const area = mount({ lossy: ["slicers"] });
  editCell(area, "A1", "250");
  nextResponse = () => lossyError;
  confirmAnswer = false;
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 10));
  assert.equal(confirmCalls, 1);
  assert.equal(calls.length, 1, "no retry after a refusal");
  assert.equal(area.querySelectorAll("td.xlsx-dirty").length, 1);
  assert.equal(area.querySelector("#xlsx-save-btn").disabled, false);
});

await test("a non-409 failure is not retried", async () => {
  const area = mount();
  editCell(area, "A1", "250");
  nextResponse = () => ({ ok: false, status: 500, body: { detail: "boom" } });
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 10));
  assert.equal(calls.length, 1);
  assert.equal(confirmCalls, 0);
  assert.equal(area.querySelectorAll("td.xlsx-dirty").length, 1);
});

// ── A8 — truncation notice ───────────────────────────────────────────────────

await test("no notice when the sheet fits within the render caps", () => {
  const area = mount({
    sheet: { rows: 500, cols: 40, total_rows: 500, total_cols: 40, max_rows: 500, max_cols: 40, truncated: false },
  });
  assert.equal(area.querySelector(".xlsx-truncated"), null);
});

await test("notice states the cap and the real size of a truncated sheet", () => {
  const area = mount({
    sheet: { rows: 500, cols: 12, total_rows: 1200, total_cols: 12, max_rows: 500, max_cols: 40, truncated: true },
  });
  const note = area.querySelector(".xlsx-truncated");
  assert.ok(note, "notice absent");
  const txt = note.textContent;
  assert.ok(txt.includes(FR["xlsx.truncated_title"]), txt);
  // {shown} is the CAP (500), not the post-trim row count: a sparse sheet
  // renders 1 row but the view still reaches 500 of them.
  const expected = FR["xlsx.truncated_rows"].replace("{shown}", "500").replace("{total}", "1200");
  assert.ok(txt.includes(expected), `${txt} !includes ${expected}`);
  // Nothing to say about the columns here (12 < 40).
  assert.ok(!txt.includes(FR["xlsx.truncated_cols"]), txt);
});

await test("notice mentions both axes when rows AND columns overflow", () => {
  const area = mount({
    sheet: { rows: 1, cols: 40, total_rows: 501, total_cols: 45, max_rows: 500, max_cols: 40, truncated: true },
  });
  const txt = area.querySelector(".xlsx-truncated").textContent;
  assert.ok(
    txt.includes(FR["xlsx.truncated_cols"].replace("{shown}", "40").replace("{total}", "45")),
    txt
  );
});

await test("a payload without the dimensions shows no notice", () => {
  // Backward compatibility: an older cached response must not produce "NaN".
  const area = mount({ sheet: { name: "Feuille1" } });
  assert.equal(area.querySelector(".xlsx-truncated"), null);
  assert.ok(!area.textContent.includes("NaN"));
});

// ── A9bis — lazy loading of the truncated tail ──────────────────────────────

const windowHtml = (from, to) =>
  '<div class="csv-table-wrapper"><table class="csv-table xlsx-table">' +
  "<tbody>" +
  Array.from({ length: to - from + 1 }, (_, i) => {
    const r = from + i;
    return `<tr><th class="xlsx-rownum">${r}</th><td data-cell="A${r}">Ligne ${r}</td></tr>`;
  }).join("") +
  "</tbody></table></div>";

await test("a truncated sheet gets a load-more footnote, a normal one does not", () => {
  const truncated = mountTruncated();
  assert.ok(truncated.querySelector(".xlsx-load-more"), "footnote absent");
  assert.ok(truncated.querySelector(".xlsx-load-more").textContent.includes(FR["xlsx.load_more"]));

  const plain = mount({ sheet: { rows: 10, cols: 2, total_rows: 10, total_cols: 2, max_rows: 500, max_cols: 40, truncated: false } });
  assert.equal(plain.querySelector(".xlsx-load-more"), null);
});

await test("clicking the footnote fetches the next window with the right query", async () => {
  const area = mountTruncated();
  apiQueue.push({
    ok: true,
    status: 200,
    body: { sheet: "Feuille1", offset: 1, limit: 500, rows: 2, total_rows: 3, truncated: true, has_more: false, html: windowHtml(2, 3) },
  });
  area.querySelector(".xlsx-load-more").click();
  await new Promise((r) => setTimeout(r, 5));
  assert.equal(calls.length, 1);
  assert.match(calls[0].url, /\/api\/file\/V\/xlsx\/sheet\?path=data\.xlsx&sheet=Feuille1&offset=1&limit=500/);
  // Rows 2 and 3 landed in the table with their real coordinates.
  assert.ok(area.querySelector('td[data-cell="A2"]'));
  assert.ok(area.querySelector('td[data-cell="A3"]'));
  assert.ok(area.querySelector('th.xlsx-rownum') && area.textContent.includes("Ligne 3"));
  // Everything loaded → the footnote is hidden (kept in the DOM, class `done`).
  const foot = area.querySelector(".xlsx-load-more");
  assert.ok(foot, "the footnote element survives");
  assert.equal(foot.classList.contains("done"), true);
  assert.ok(!foot.textContent.includes(FR["xlsx.load_more"]), foot.textContent);
});

await test("appended rows are editable and tracked as dirty", async () => {
  const area = mountTruncated();
  apiQueue.push({
    ok: true,
    status: 200,
    body: { sheet: "Feuille1", offset: 1, limit: 500, rows: 1, total_rows: 3, truncated: true, has_more: false, html: windowHtml(2, 2) },
  });
  area.querySelector(".xlsx-load-more").click();
  await new Promise((r) => setTimeout(r, 5));
  editCell(area, "A2", "modifié");
  area.querySelector("#xlsx-save-btn").click();
  await new Promise((r) => setTimeout(r, 5));
  assert.equal(calls.length, 2, "the save went out");
  assert.equal(calls[1].url.includes("/xlsx/save"), true);
  assert.deepEqual(calls[1].body.cells, { A2: "modifié" });
  assert.equal(calls[1].body.sheet, "Feuille1");
});

await test("a failed window fetch keeps the footnote and shows an error toast", async () => {
  const area = mountTruncated();
  apiQueue.push({ ok: false, status: 500, body: { detail: "boom" } });
  area.querySelector(".xlsx-load-more").click();
  await new Promise((r) => setTimeout(r, 5));
  const foot = area.querySelector(".xlsx-load-more");
  assert.ok(foot, "footnote must survive a failed fetch");
  assert.ok(foot.textContent.includes(FR["xlsx.load_more"]), foot.textContent);
  // `api()` itself toasts the failure (shared behaviour, asserted in E2E);
  // here we assert the local consequence: the footnote keeps its label.
  // Retrying works once the server answers again.
  apiQueue.push({
    ok: true,
    status: 200,
    body: { sheet: "Feuille1", offset: 1, limit: 500, rows: 1, total_rows: 3, truncated: true, has_more: false, html: windowHtml(2, 2) },
  });
  foot.click();
  await new Promise((r) => setTimeout(r, 5));
  assert.ok(area.querySelector('td[data-cell="A2"]'));
  assert.equal(area.querySelector(".xlsx-load-more").classList.contains("done"), true);
});

await test("two windows in a row walk the whole sheet", async () => {
  const area = mountTruncated({ total: 1200 });
  apiQueue.push({
    ok: true,
    status: 200,
    body: { sheet: "Feuille1", offset: 1, limit: 500, rows: 500, total_rows: 1200, truncated: true, has_more: true, html: windowHtml(2, 501) },
  });
  area.querySelector(".xlsx-load-more").click();
  await new Promise((r) => setTimeout(r, 5));
  assert.ok(area.querySelector('td[data-cell="A501"]'));
  // The footnote still shows, with the updated progress.
  let foot = area.querySelector(".xlsx-load-more");
  assert.ok(foot, "more rows remain");
  assert.ok(foot.textContent.includes("501"), foot.textContent);

  apiQueue.push({
    ok: true,
    status: 200,
    body: { sheet: "Feuille1", offset: 501, limit: 500, rows: 200, total_rows: 1200, truncated: true, has_more: false, html: windowHtml(502, 701) },
  });
  foot.click();
  await new Promise((r) => setTimeout(r, 5));
  assert.ok(area.querySelector('td[data-cell="A701"]'));
  assert.equal(area.querySelector(".xlsx-load-more").classList.contains("done"), true);
});

// ── Report ──────────────────────────────────────────────────────────────────
console.log(`\n${passCount}/${testCount} tests passed\n`);
process.exit(passCount === testCount ? 0 : 1);