#!/usr/bin/env node
/**
 * Test runner for the js_of_ocaml-compiled SX engine.
 *
 * Loads the OCaml CEK machine (compiled to JS) and runs the spec test suite.
 *
 * Usage:
 *   node hosts/ocaml/browser/run_tests_js.js           # standard tests
 *   node hosts/ocaml/browser/run_tests_js.js --full     # full suite
 */

const fs = require("fs");
const path = require("path");

// Load the compiled OCaml engine
const enginePath = path.join(__dirname, "../_build/default/browser/sx_browser.bc.js");
if (!fs.existsSync(enginePath)) {
  console.error("Build first: cd hosts/ocaml && eval $(opam env) && dune build browser/sx_browser.bc.js");
  process.exit(1);
}
require(enginePath);

const K = globalThis.SxKernel;
const full = process.argv.includes("--full");

// Test state
let passed = 0;
let failed = 0;
let errors = [];
let suiteStack = [];

function currentSuite() {
  return suiteStack.length > 0 ? suiteStack.join(" > ") : "";
}

// Register platform test functions
K.registerNative("report-pass", (args) => {
  const name = typeof args[0] === "string" ? args[0] : JSON.stringify(args[0]);
  passed++;
  if (process.env.VERBOSE) {
    console.log(`  PASS: ${currentSuite()} > ${name}`);
  } else {
    process.stdout.write(".");
    if (passed % 80 === 0) process.stdout.write("\n");
  }
  return null;
});

K.registerNative("report-fail", (args) => {
  const name = typeof args[0] === "string" ? args[0] : JSON.stringify(args[0]);
  const error = args.length > 1 && args[1] != null
    ? (typeof args[1] === "string" ? args[1] : JSON.stringify(args[1]))
    : "unknown";
  failed++;
  const fullName = currentSuite() ? `${currentSuite()} > ${name}` : name;
  errors.push(`FAIL: ${fullName}\n  ${error}`);
  process.stdout.write("F");
});

K.registerNative("push-suite", (args) => {
  const name = typeof args[0] === "string" ? args[0] : String(args[0]);
  suiteStack.push(name);
  return null;
});

K.registerNative("pop-suite", (_args) => {
  suiteStack.pop();
  return null;
});

console.log(`=== SX OCaml→JS Engine Test Runner ===`);
console.log(`Engine: ${K.engine()}`);
console.log(`Mode: ${full ? "full" : "standard"}`);
console.log("");

// Load a .sx file by reading it from disk and evaluating via loadSource
function loadFile(filePath) {
  const src = fs.readFileSync(filePath, "utf8");
  return K.loadSource(src);
}

// Test files
const specDir = path.join(__dirname, "../../../spec");
const testDir = path.join(specDir, "tests");

const standardTests = [
  "test-framework.sx",
  "test-eval.sx",
  "test-parser.sx",
  "test-primitives.sx",
  "test-collections.sx",
  "test-closures.sx",
  "test-defcomp.sx",
  "test-macros.sx",
  "test-errors.sx",
  "test-render.sx",
  "test-tco.sx",
  "test-scope.sx",
  "test-cek.sx",
  "test-advanced.sx",
];

const fullOnlyTests = [
  "test-freeze.sx",
  "test-continuations.sx",
  "test-continuations-advanced.sx",
  "test-cek-advanced.sx",
  "test-signals-advanced.sx",
  "test-render-advanced.sx",
  "test-integration.sx",
  "test-strict.sx",
  "test-types.sx",
];

const testFiles = full ? [...standardTests, ...fullOnlyTests] : standardTests;

for (const file of testFiles) {
  const filePath = path.join(testDir, file);
  if (!fs.existsSync(filePath)) {
    console.log(`\nSkipping ${file} (not found)`);
    continue;
  }

  const label = file.replace(".sx", "").replace("test-", "");
  process.stdout.write(`\n[${label}] `);

  const result = loadFile(filePath);
  if (typeof result === "string" && result.startsWith("Error:")) {
    console.log(`\n  LOAD ERROR: ${result}`);
    failed++;
    errors.push(`LOAD ERROR: ${file}\n  ${result}`);
  }
}

console.log("\n");

if (errors.length > 0) {
  console.log(`--- Failures (${errors.length}) ---`);
  for (const e of errors.slice(0, 20)) {
    console.log(e);
  }
  if (errors.length > 20) {
    console.log(`... and ${errors.length - 20} more`);
  }
  console.log("");
}

console.log(`Results: ${passed} passed, ${failed} failed, ${passed + failed} total`);
process.exit(failed > 0 ? 1 : 0);