const test = require('node:test');
const assert = require('node:assert/strict');

const { Reactor_CSTR, Reactor_PFR } = require('../../src/specificClass');
const { makeReactorConfig } = require('../helpers/factories');

test('CSTR getGridProfile returns null', () => {
  const reactor = new Reactor_CSTR(makeReactorConfig({ reactor_type: 'CSTR' }));
  assert.equal(reactor.getGridProfile, null);
});

test('PFR getGridProfile returns state matrix with correct dimensions', () => {
  const n_x = 8;
  const length = 40;
  const reactor = new Reactor_PFR(
    makeReactorConfig({ reactor_type: 'PFR', resolution_L: n_x, length }),
  );

  const profile = reactor.getGridProfile;
  assert.notEqual(profile, null);
  assert.equal(profile.n_x, n_x);
  assert.equal(profile.d_x, length / n_x);
  assert.equal(profile.length, length);
  assert.equal(profile.grid.length, n_x, 'grid should have n_x rows');
  assert.equal(profile.grid[0].length, 13, 'each row should have 13 species');
  assert.ok(Array.isArray(profile.species), 'species list should be an array');
  assert.equal(profile.species.length, 13);
  assert.equal(profile.species[3], 'S_NH');
  assert.equal(typeof profile.timestamp, 'number');
});

test('PFR getGridProfile is mutation-safe', () => {
  const reactor = new Reactor_PFR(
    makeReactorConfig({ reactor_type: 'PFR', resolution_L: 5, length: 10 }),
  );

  const profile = reactor.getGridProfile;
  const originalValue = reactor.state[0][3]; // S_NH at cell 0

  // Mutate the returned grid
  profile.grid[0][3] = 999;

  // Reactor internal state should be unchanged
  assert.equal(reactor.state[0][3], originalValue, 'mutating grid copy must not affect reactor state');
});