import { readFileSync } from 'node:fs';
import { strictEqual, ok, throws } from 'node:assert';
import { describe, it } from 'node:test';
import {
  findLib,
  init,
  free,
  loadBundle,
  loadBundleDefault,
  kernelRoot,
} from '../src/lib.js';

const fixtureDir = '../../test/fixtures';
const libPath = findLib();

describe('library discovery', () => {
  it('findLib returns an existing .so path', () => {
    ok(libPath.endsWith('.so') || libPath.endsWith('.dylib') || libPath.endsWith('.dll'));
    ok(readFileSync(libPath));
  });
});

describe('context lifecycle', () => {
  it('init creates a valid context', () => {
    const ctx = init(libPath);
    ok(ctx);
    free(ctx);
  });

  it('kernel root is available', () => {
    const ctx = init(libPath);
    try {
      const root = kernelRoot(ctx);
      ok(root > 0, 'kernel root should be a positive index');
    } finally {
      free(ctx);
    }
  });
});

describe('bundle loading', () => {
  it('loadBundleDefault loads id.arboricx', () => {
    const ctx = init(libPath);
    try {
      const bundle = readFileSync(`${fixtureDir}/id.arboricx`);
      const root = loadBundleDefault(ctx, bundle);
      ok(root > 0, 'loaded root should be a positive index');
    } finally {
      free(ctx);
    }
  });

  it('loadBundleDefault loads true.arboricx', () => {
    const ctx = init(libPath);
    try {
      const bundle = readFileSync(`${fixtureDir}/true.arboricx`);
      const root = loadBundleDefault(ctx, bundle);
      ok(root > 0);
    } finally {
      free(ctx);
    }
  });

  it('loadBundle loads named export from id.arboricx', () => {
    const ctx = init(libPath);
    try {
      const bundle = readFileSync(`${fixtureDir}/id.arboricx`);
      const root = loadBundle(ctx, bundle, 'id');
      ok(root > 0);
    } finally {
      free(ctx);
    }
  });

  it('loadBundle fails for missing export name', () => {
    const ctx = init(libPath);
    try {
      const bundle = readFileSync(`${fixtureDir}/id.arboricx`);
      throws(() => loadBundle(ctx, bundle, 'nonexistent'), /failed/);
    } finally {
      free(ctx);
    }
  });

  it('loadBundleDefault fails for invalid bytes', () => {
    const ctx = init(libPath);
    try {
      throws(() => loadBundleDefault(ctx, Buffer.from('not a bundle')), /failed/);
    } finally {
      free(ctx);
    }
  });
});