import { describe, it, expect, beforeAll } from 'vitest';
import { existsSync, readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { compileAllInk } from './compile-ink.mjs';

/**
 * Phase 2 Plan 02-04 Task 1 sanity test for the build-time Ink compiler.
 *
 * Imports compile-ink.mjs (the CLI guard prevents the auto-run path from
 * firing under Vitest) and exercises compileAllInk() against the real
 * /content/dialogue tree exactly once via beforeAll. Subsequent test
 * cases inspect the resulting artefacts.
 *
 * W9 invariant: compileAllInk() wipes src/content/compiled-ink/ at start,
 * so we MUST call it from a single beforeAll. Calling it inside multiple
 * test cases — or concurrently with src/content/ink-loader.test.ts —
 * creates a filesystem race. The npm run ci chain runs `compile:ink`
 * BEFORE `test` so under CI both this file and ink-loader.test.ts see
 * a fully-populated compiled-ink/ directory at module-eval time. This
 * file's beforeAll is defensive belt-and-suspenders.
 *
 * Determinism guarantee: inklecate is deterministic from .ink content,
 * so same inputs ALWAYS produce the same JSON output.
 */

let compileResult = null;

beforeAll(async () => {
  // wipe=false to avoid racing with src/content/ink-loader.test.ts when
  // Vitest runs test files in parallel. Production CLI invocation
  // (`npm run compile:ink`) keeps wipe=true to clear deleted .ink files.
  compileResult = await compileAllInk({ wipe: false });
});

describe('scripts/compile-ink.mjs', () => {
  it('exports compileAllInk', () => {
    expect(typeof compileAllInk).toBe('function');
  });

  it('compiles all .ink files in content/dialogue/ and emits .ink.json under src/content/compiled-ink/', () => {
    expect(compileResult).not.toBeNull();
    // 3 Lura beats + 1 compost = 4 minimum. Phase 4+ will add more.
    expect(compileResult.compiled).toBeGreaterThanOrEqual(4);
    const expected = [
      'src/content/compiled-ink/season1/lura-arrival.ink.json',
      'src/content/compiled-ink/season1/lura-mid.ink.json',
      'src/content/compiled-ink/season1/lura-farewell.ink.json',
      'src/content/compiled-ink/season1/compost-acknowledgements.ink.json',
    ];
    for (const rel of expected) {
      expect(existsSync(resolve(process.cwd(), rel))).toBe(true);
    }
  });

  it('produces valid JSON output (parses without error)', () => {
    const arrival = readFileSync(
      resolve(process.cwd(), 'src/content/compiled-ink/season1/lura-arrival.ink.json'),
      'utf8',
    );
    // inklecate emits a UTF-8 BOM header byte on some platforms; strip it
    // before JSON.parse just like the runtime loader will.
    const stripped = arrival.charCodeAt(0) === 0xfeff ? arrival.slice(1) : arrival;
    expect(() => JSON.parse(stripped)).not.toThrow();
    const obj = JSON.parse(stripped);
    expect(obj).toBeTypeOf('object');
    // inklecate v1.x stories carry an `inkVersion` property at the root.
    expect(obj.inkVersion).toBeTypeOf('number');
  });
});