#!/usr/bin/env node
/**
 * Run hyperscript behavioral tests in Node.js using the WASM kernel.
 * No browser needed — uses a minimal DOM mock.
 */
const fs = require('fs');
const path = require('path');

const PROJECT = path.resolve(__dirname, '..');
const WASM_DIR = path.join(PROJECT, 'shared/static/wasm');
const SX_DIR = path.join(WASM_DIR, 'sx');

// Load WASM kernel
eval(fs.readFileSync(path.join(WASM_DIR, 'sx_browser.bc.js'), 'utf8'));
const K = globalThis.SxKernel;

// ─── Minimal DOM mock ───────────────────────────────────────────
class MockElement {
  constructor(tag) {
    this.tagName = tag.toUpperCase();
    this.nodeName = this.tagName;
    this.nodeType = 1;
    this.id = '';
    this.className = '';
    this.classList = new MockClassList(this);
    this.style = {};
    this.attributes = {};
    this.children = [];
    this.childNodes = [];
    this.parentElement = null;
    this.parentNode = null;
    this.textContent = '';
    this.innerHTML = '';
    this.outerHTML = '';
    this._listeners = {};
    this._hs = {};  // hyperscript data
    this.dataset = {};
    this.open = false; // for dialog
  }
  setAttribute(name, val) { this.attributes[name] = val; if (name === 'id') this.id = val; if (name === 'class') { this.className = val; this.classList._sync(val); } }
  getAttribute(name) { return this.attributes[name] !== undefined ? this.attributes[name] : null; }
  removeAttribute(name) { delete this.attributes[name]; }
  hasAttribute(name) { return name in this.attributes; }
  addEventListener(evt, fn, opts) {
    if (!this._listeners[evt]) this._listeners[evt] = [];
    this._listeners[evt].push(fn);
  }
  removeEventListener(evt, fn) {
    if (this._listeners[evt]) this._listeners[evt] = this._listeners[evt].filter(f => f !== fn);
  }
  dispatchEvent(event) {
    event.target = this;
    event.currentTarget = this;
    const fns = this._listeners[event.type] || [];
    for (const fn of fns) {
      try { fn(event); } catch(e) {}
    }
    // Bubble
    if (event.bubbles && !event._stopped && this.parentElement) {
      event.currentTarget = this.parentElement;
      this.parentElement.dispatchEvent(event);
    }
    return !event.defaultPrevented;
  }
  appendChild(child) {
    if (child.parentElement) child.parentElement.removeChild(child);
    child.parentElement = this;
    child.parentNode = this;
    this.children.push(child);
    this.childNodes.push(child);
    return child;
  }
  removeChild(child) {
    this.children = this.children.filter(c => c !== child);
    this.childNodes = this.childNodes.filter(c => c !== child);
    child.parentElement = null;
    child.parentNode = null;
    return child;
  }
  insertBefore(newChild, refChild) {
    const idx = this.children.indexOf(refChild);
    if (idx >= 0) { this.children.splice(idx, 0, newChild); this.childNodes.splice(idx, 0, newChild); }
    else { this.children.push(newChild); this.childNodes.push(newChild); }
    newChild.parentElement = this;
    newChild.parentNode = this;
    return newChild;
  }
  replaceChild(newChild, oldChild) {
    const idx = this.children.indexOf(oldChild);
    if (idx >= 0) { this.children[idx] = newChild; this.childNodes[idx] = newChild; }
    newChild.parentElement = this;
    newChild.parentNode = this;
    oldChild.parentElement = null;
    oldChild.parentNode = null;
    return oldChild;
  }
  querySelector(sel) { return findInTree(this, sel); }
  querySelectorAll(sel) { return findAllInTree(this, sel); }
  closest(sel) {
    let el = this;
    while (el) { if (matchesSelector(el, sel)) return el; el = el.parentElement; }
    return null;
  }
  matches(sel) { return matchesSelector(this, sel); }
  contains(other) {
    if (other === this) return true;
    for (const c of this.children) { if (c === other || c.contains(other)) return true; }
    return false;
  }
  cloneNode(deep) {
    const el = new MockElement(this.tagName.toLowerCase());
    Object.assign(el.attributes, this.attributes);
    el.id = this.id;
    el.className = this.className;
    el.classList._sync(this.className);
    Object.assign(el.style, this.style);
    el.textContent = this.textContent;
    el.innerHTML = this.innerHTML;
    if (deep) { for (const c of this.children) el.appendChild(c.cloneNode(true)); }
    return el;
  }
  focus() {}
  blur() {}
  click() { this.dispatchEvent(new MockEvent('click', { bubbles: true })); }
  remove() { if (this.parentElement) this.parentElement.removeChild(this); }
  get firstElementChild() { return this.children[0] || null; }
  get lastElementChild() { return this.children[this.children.length - 1] || null; }
  get nextElementSibling() {
    if (!this.parentElement) return null;
    const idx = this.parentElement.children.indexOf(this);
    return this.parentElement.children[idx + 1] || null;
  }
  get previousElementSibling() {
    if (!this.parentElement) return null;
    const idx = this.parentElement.children.indexOf(this);
    return idx > 0 ? this.parentElement.children[idx - 1] : null;
  }
  // Dialog methods
  showModal() { this.open = true; this.setAttribute('open', ''); }
  show() { this.open = true; this.setAttribute('open', ''); }
  close() { this.open = false; this.removeAttribute('open'); }
  // Transition stub
  getAnimations() { return []; }
  getBoundingClientRect() { return { top: 0, left: 0, width: 100, height: 100, right: 100, bottom: 100 }; }
  scrollIntoView() {}
}

class MockClassList {
  constructor(el) { this._el = el; this._set = new Set(); }
  _sync(str) { this._set = new Set((str || '').split(/\s+/).filter(Boolean)); }
  add(...cls) { for (const c of cls) this._set.add(c); this._el.className = [...this._set].join(' '); }
  remove(...cls) { for (const c of cls) this._set.delete(c); this._el.className = [...this._set].join(' '); }
  toggle(cls, force) {
    if (force !== undefined) { if (force) this.add(cls); else this.remove(cls); return force; }
    if (this._set.has(cls)) { this.remove(cls); return false; }
    else { this.add(cls); return true; }
  }
  contains(cls) { return this._set.has(cls); }
  get length() { return this._set.size; }
  [Symbol.iterator]() { return this._set[Symbol.iterator](); }
}

class MockEvent {
  constructor(type, opts = {}) {
    this.type = type;
    this.bubbles = opts.bubbles || false;
    this.cancelable = opts.cancelable !== false;
    this.defaultPrevented = false;
    this._stopped = false;
    this._stoppedImmediate = false;
    this.target = null;
    this.currentTarget = null;
    this.detail = opts.detail || null;
  }
  preventDefault() { this.defaultPrevented = true; }
  stopPropagation() { this._stopped = true; }
  stopImmediatePropagation() { this._stopped = true; this._stoppedImmediate = true; }
}

class MockCustomEvent extends MockEvent {
  constructor(type, opts = {}) { super(type, opts); this.detail = opts.detail || null; }
}

function matchesSelector(el, sel) {
  if (!el || !el.tagName) return false;
  if (sel.startsWith('#')) return el.id === sel.slice(1);
  if (sel.startsWith('.')) return el.classList.contains(sel.slice(1));
  if (sel.includes('#')) { const [tag, id] = sel.split('#'); return el.tagName.toLowerCase() === tag && el.id === id; }
  return el.tagName.toLowerCase() === sel.toLowerCase();
}

function findInTree(el, sel) {
  for (const c of (el.children || [])) {
    if (matchesSelector(c, sel)) return c;
    const found = findInTree(c, sel);
    if (found) return found;
  }
  return null;
}

function findAllInTree(el, sel) {
  const results = [];
  for (const c of (el.children || [])) {
    if (matchesSelector(c, sel)) results.push(c);
    results.push(...findAllInTree(c, sel));
  }
  return results;
}

// ─── Global DOM mock ────────────────────────────────────────────
const _body = new MockElement('body');
const _html = new MockElement('html');
_html.appendChild(_body);

const document = {
  body: _body,
  documentElement: _html,
  createElement(tag) { return new MockElement(tag); },
  createElementNS(ns, tag) { return new MockElement(tag); },
  createDocumentFragment() { return new MockElement('fragment'); },
  createTextNode(text) { const t = { nodeType: 3, textContent: text, data: text }; return t; },
  getElementById(id) { return findInTree(_body, '#' + id); },
  querySelector(sel) { return findInTree(_body, sel); },
  querySelectorAll(sel) { return findAllInTree(_body, sel); },
  createEvent(type) { return new MockEvent(type); },
  addEventListener() {},
  removeEventListener() {},
};

globalThis.document = document;
globalThis.window = globalThis;
globalThis.HTMLElement = MockElement;
globalThis.Element = MockElement;
globalThis.Event = MockEvent;
globalThis.CustomEvent = MockCustomEvent;
globalThis.NodeList = Array;
globalThis.HTMLCollection = Array;
globalThis.getComputedStyle = (el) => el.style;
globalThis.requestAnimationFrame = (fn) => setTimeout(fn, 0);
globalThis.cancelAnimationFrame = (id) => clearTimeout(id);
globalThis.MutationObserver = class { observe() {} disconnect() {} };
globalThis.ResizeObserver = class { observe() {} disconnect() {} };
globalThis.IntersectionObserver = class { observe() {} disconnect() {} };
globalThis.navigator = { userAgent: 'node-test' };
globalThis.location = { href: 'http://localhost/', pathname: '/', search: '', hash: '' };
globalThis.history = { pushState() {}, replaceState() {}, back() {}, forward() {} };

// ─── Host FFI ───────────────────────────────────────────────────
K.registerNative('host-global', a => { const n = a[0]; return (n in globalThis) ? globalThis[n] : null; });
K.registerNative('host-get', a => { if (a[0] == null) return null; const v = a[0][a[1]]; return v === undefined ? null : v; });
K.registerNative('host-set!', a => { if (a[0] != null) a[0][a[1]] = a[2]; return a[2]; });
K.registerNative('host-call', a => {
  const [o, m, ...r] = a;
  if (o == null) { const f = globalThis[m]; return typeof f === 'function' ? f.apply(null, r) : null; }
  if (typeof o[m] !== 'function') return null;
  try { const v = o[m].apply(o, r); return v === undefined ? null : v; } catch(e) { return null; }
});
K.registerNative('host-new', a => {
  const C = typeof a[0] === 'string' ? globalThis[a[0]] : a[0];
  return typeof C === 'function' ? new C(...a.slice(1)) : null;
});
K.registerNative('host-callback', a => {
  const fn = a[0];
  if (typeof fn === 'function' && fn.__sx_handle === undefined) return fn;
  if (fn && fn.__sx_handle !== undefined) {
    return function() {
      const r = K.callFn(fn, Array.from(arguments));
      if (globalThis._driveAsync) globalThis._driveAsync(r);
      return r;
    };
  }
  return function() {};
});
K.registerNative('host-typeof', a => {
  const o = a[0]; if (o == null) return 'nil';
  if (o instanceof MockElement) return 'element';
  if (o && o.nodeType === 3) return 'text';
  if (o instanceof MockEvent || o instanceof MockCustomEvent) return 'event';
  if (o instanceof Promise) return 'promise';
  return typeof o;
});
K.registerNative('host-await', a => {
  const [p, cb] = a;
  if (p && typeof p.then === 'function') {
    const f = (cb && cb.__sx_handle !== undefined) ? v => K.callFn(cb, [v]) : () => {};
    p.then(f);
  }
});
K.registerNative('load-library!', () => false);

// Drive async suspension — synchronous, with depth limit
globalThis._driveAsync = function driveAsync(result, depth) {
  depth = depth || 0;
  if (depth > 200) return; // prevent infinite loops
  if (!result || !result.suspended) return;
  const req = result.request;
  const items = req && (req.items || req);
  const op = items && items[0];
  const opName = typeof op === 'string' ? op : (op && op.name) || String(op);
  const arg = items && items[1];
  function doResume(val) {
    try { const r = result.resume(val); driveAsync(r, depth + 1); } catch(e) {}
  }
  if (opName === 'io-sleep' || opName === 'wait') doResume(null);
  else if (opName === 'io-fetch') doResume({ ok: true, text: '' });
  else if (opName === 'io-settle') doResume(null);
  else if (opName === 'io-wait-event') doResume(null);
  else if (opName === 'io-transition') doResume(null);
};

K.eval('(define SX_VERSION "hs-test-1.0")');
K.eval('(define SX_ENGINE "ocaml-vm-sandbox")');
K.eval('(define parse sx-parse)');
K.eval('(define serialize sx-serialize)');

// ─── Load modules ───────────────────────────────────────────────
const WEB_MODULES = [
  'render', 'core-signals', 'signals', 'deps', 'router',
  'page-helpers', 'freeze', 'dom', 'browser',
  'adapter-html', 'adapter-sx', 'adapter-dom',
  'boot-helpers', 'hypersx', 'engine', 'orchestration', 'boot',
];
const HS_MODULES = ['hs-tokenizer', 'hs-parser', 'hs-compiler', 'hs-runtime', 'hs-integration'];

K.beginModuleLoad();
for (const mod of [...WEB_MODULES, ...HS_MODULES]) {
  const sxPath = path.join(SX_DIR, mod + '.sx');
  const libPath = path.join(PROJECT, 'lib/hyperscript', mod.replace(/^hs-/, '') + '.sx');
  let src;
  try { src = fs.existsSync(sxPath) ? fs.readFileSync(sxPath, 'utf8') : fs.readFileSync(libPath, 'utf8'); }
  catch(e) { console.error(`SKIP: ${mod}`); continue; }
  try { K.load(src); } catch(e) { console.error(`LOAD ERROR: ${mod}: ${e.message}`); }
}
K.endModuleLoad();

// ─── Register tests ─────────────────────────────────────────────
K.eval('(define _test-registry (list))');
K.eval('(define _test-suite "")');
K.eval('(define push-suite (fn (name) (set! _test-suite name)))');
K.eval('(define pop-suite (fn () (set! _test-suite "")))');
K.eval(`(define try-call (fn (thunk)
  (set! _test-registry (append _test-registry (list {:suite _test-suite :thunk thunk})))
  {:ok true}))`);
K.eval(`(define report-pass (fn (name)
  (let ((i (- (len _test-registry) 1)))
    (when (>= i 0) (dict-set! (nth _test-registry i) "name" name)))))`);
K.eval(`(define report-fail (fn (name error)
  (let ((i (- (len _test-registry) 1)))
    (when (>= i 0) (dict-set! (nth _test-registry i) "name" name)))))`);

// Load test files
for (const f of ['spec/harness.sx', 'spec/tests/test-framework.sx', 'spec/tests/test-hyperscript-behavioral.sx']) {
  try { K.load(fs.readFileSync(path.join(PROJECT, f), 'utf8')); }
  catch(e) { console.error(`LOAD ERROR: ${f}: ${e.message}`); }
}

// ─── Run tests ──────────────────────────────────────────────────
const testCount = K.eval('(len _test-registry)');
console.log(`Loaded ${testCount} tests`);

let passed = 0, failed = 0;
const cats = {};
const errTypes = {};
const failDetails = [];

for (let i = 0; i < testCount; i++) {
  const suite = K.eval(`(get (nth _test-registry ${i}) "suite")`) || '';
  const name = K.eval(`(get (nth _test-registry ${i}) "name")`) || `test-${i}`;

  // Reset body
  _body.children = [];
  _body.childNodes = [];
  _body.innerHTML = '';

  process.stderr.write(`  [${i}/${testCount}] ${suite} > ${name}\n`);

  let ok = false;
  let err = null;
  try {
    const thunk = K.eval(`(get (nth _test-registry ${i}) "thunk")`);
    if (!thunk) { err = 'no thunk'; }
    else {
      const r = K.callFn(thunk, []);
      if (r && r.suspended) globalThis._driveAsync(r);
      ok = true;
    }
  } catch(e) {
    err = (e.message || '').slice(0, 150);
  }

  if (!cats[suite]) cats[suite] = { p: 0, f: 0, errs: [] };
  if (ok) {
    passed++;
    cats[suite].p++;
  } else {
    failed++;
    cats[suite].f++;
    cats[suite].errs.push({ name, err });

    let t = 'other';
    if (err === 'TIMEOUT') t = 'timeout';
    else if (err && err.includes('NOT IMPLEMENTED')) t = 'stub';
    else if (err && err.includes('Assertion')) t = 'assert-fail';
    else if (err && err.includes('Expected')) t = 'wrong-value';
    else if (err && err.includes('Undefined symbol')) t = 'undef-sym';
    else if (err && err.includes('Unhandled')) t = 'unhandled';
    errTypes[t] = (errTypes[t] || 0) + 1;
  }
}

// ─── Report ─────────────────────────────────────────────────────
console.log(`\nResults: ${passed}/${passed + failed} (${(100 * passed / (passed + failed)).toFixed(0)}%)\n`);

console.log('By category:');
for (const [cat, s] of Object.entries(cats).sort((a, b) => (b[1].p / (b[1].p + b[1].f)) - (a[1].p / (a[1].p + a[1].f)))) {
  const mark = s.f === 0 ? `✓ ${s.p}` : `${s.p}/${s.p + s.f}`;
  console.log(`  ${cat}: ${mark}`);
}

console.log('\nFailure types:');
for (const [t, n] of Object.entries(errTypes).sort((a, b) => b[1] - a[1])) {
  console.log(`  ${t}: ${n}`);
}

// Unique errors
const uniqueErrors = {};
for (const [cat, s] of Object.entries(cats)) {
  for (const { name, err } of s.errs) {
    const e = (err || '').slice(0, 100);
    if (!uniqueErrors[e]) uniqueErrors[e] = 0;
    uniqueErrors[e]++;
  }
}
console.log(`\nUnique errors (${Object.keys(uniqueErrors).length}):`);
for (const [e, n] of Object.entries(uniqueErrors).sort((a, b) => b[1] - a[1]).slice(0, 30)) {
  console.log(`  [${n}x] ${e}`);
}

// Show per-category failures for categories with < 5 failures
console.log('\nDetailed failures (categories with <10 fails):');
for (const [cat, s] of Object.entries(cats).sort((a, b) => a[1].f - b[1].f)) {
  if (s.f > 0 && s.f < 10) {
    console.log(`  ${cat} (${s.p}/${s.p + s.f}):`);
    for (const { name, err } of s.errs) {
      console.log(`    FAIL: ${name}: ${(err || '').slice(0, 100)}`);
    }
  }
}