import assert from "node:assert/strict";
import { readFile } from "node:fs/promises";
import createModule from "../../build-wasm/linuxcnc-sim-core.js";
import { ProgramRunner } from "./program-runner.mjs";

const core = await createModule({ wasmBinary: await readFile(new URL("../../build-wasm/linuxcnc-sim-core.wasm", import.meta.url)) });

async function run(source, expectedX) {
  const runner = new ProgramRunner(core);
  const loaded = runner.load(source, "control.ngc");
  assert.equal(loaded.status, "verified");
  assert.equal(runner.start().status, "verified");
  let guard = 0;
  while (runner.status === "running" && guard < 200) { runner.tick(1); guard += 1; }
  assert.ok(guard < 200, "control program exceeded deterministic budget");
  assert.equal(runner.status, "completed");
  assert.equal(runner.state.x, expectedX);
  runner.destroy();
}

await run(`#1=0\nO10 WHILE [#1 LT 3]\n#1=[#1+1]\nG1 X[#1]\nO10 ENDWHILE\nM2\n`, 3);
await run(`#1=0\nO100 SUB\n#1=[#1+1]\nG1 X[#1]\nO100 ENDSUB\nO100 CALL\nO100 CALL\nM2\n`, 2);
await run(`#1=0\nO1 IF [#1 EQ 1]\nG1 X9\nO1 ELSE\nG1 X4\nO1 ENDIF\nM2\n`, 4);

const malformed = new ProgramRunner(core);
const malformedResult = malformed.load("O10 WHILE [1]\nG1 X1\n", "bad-control.ngc");
assert.equal(malformedResult.status, "error");
assert.equal(malformedResult.code, "program_control_unclosed");
assert.equal(malformedResult.line, 2);
malformed.destroy();

const missing = new ProgramRunner(core);
assert.equal(missing.load("O999 CALL\n", "missing.ngc").status, "verified");
missing.start();
const missingStep = missing.step();
assert.equal(missingStep.status, "error");
assert.equal(missingStep.code, "program_control");
assert.equal(missingStep.detail, "program_subroutine_missing");
missing.destroy();

console.log("program_control=passed while=3 call=2 if=else depth_budget=verified");