import { readdirSync, readFileSync } from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

import { describe, expect, it } from 'vitest';

import { parseManifest, validateManifest } from './manifest';

const fixturesDir = path.join(
  path.dirname(fileURLToPath(import.meta.url)),
  '..',
  'fixtures',
  'manifests',
);

function loadFixture(kind: 'valid' | 'invalid', name: string): unknown {
  return JSON.parse(readFileSync(path.join(fixturesDir, kind, name), 'utf8'));
}

function listFixtures(kind: 'valid' | 'invalid'): string[] {
  return readdirSync(path.join(fixturesDir, kind))
    .filter((f) => f.endsWith('.json'))
    .sort();
}

describe('manifest validation — valid fixtures', () => {
  const valid = listFixtures('valid');

  it('ships at least the reference-plugin manifests', () => {
    expect(valid).toEqual(
      expect.arrayContaining(['mermaid.json', 'section-styles-basic.json', 'toc.json']),
    );
  });

  it.each(valid)('%s validates cleanly', (name) => {
    const result = validateManifest(loadFixture('valid', name));
    expect(result.issues).toEqual([]);
    expect(result.success).toBe(true);
    expect(result.manifest?.id).toBeTruthy();
  });

  it('parseManifest returns a typed manifest', () => {
    const manifest = parseManifest(loadFixture('valid', 'toc.json'));
    expect(manifest.kind).toBe('code');
    expect(manifest.extensionPoints[0]?.title.de).toBe('Inhaltsverzeichnis');
    // permissions default is applied even though every fixture sets it.
    expect(manifest.permissions).toContain('readCurrentPage');
  });

  it('defaults permissions to an empty array when omitted', () => {
    const manifest = parseManifest(loadFixture('valid', 'section-styles-basic.json'));
    expect(manifest.permissions).toEqual([]);
  });
});

describe('manifest validation — invalid fixtures', () => {
  const invalid = listFixtures('invalid');

  it('provides at least ten invalid variants', () => {
    expect(invalid.length).toBeGreaterThanOrEqual(10);
  });

  it.each(invalid)('%s is rejected with issues', (name) => {
    const result = validateManifest(loadFixture('invalid', name));
    expect(result.success).toBe(false);
    expect(result.manifest).toBeUndefined();
    expect(result.issues.length).toBeGreaterThan(0);
    for (const issue of result.issues) {
      expect(issue.path).toBeTruthy();
      expect(issue.message).toBeTruthy();
    }
  });

  // Spot-check that the messages are actionable and point at the right field.
  const expectations: Record<string, { path: string | RegExp; message: RegExp }> = {
    '01-missing-id.json': { path: 'id', message: /required/i },
    '02-bad-id.json': { path: 'id', message: /lowercase slug/i },
    '03-missing-name.json': { path: 'name', message: /required/i },
    '04-bad-version.json': { path: 'version', message: /semantic version/i },
    '05-bad-api-version.json': { path: 'apiVersion', message: /major version/i },
    '06-bad-kind.json': { path: 'kind', message: /.+/ },
    '07-empty-extension-points.json': { path: 'extensionPoints', message: /.+/ },
    '08-kind-mismatch.json': {
      path: 'extensionPoints.0.type',
      message: /allows only .* extension points/i,
    },
    '09-duplicate-extension-point-id.json': {
      path: 'extensionPoints.1.id',
      message: /duplicate extension point id/i,
    },
    '10-title-missing-de.json': { path: 'extensionPoints.0.title.de', message: /required/i },
    '11-unknown-permission.json': { path: 'permissions.1', message: /.+/ },
    '12-bad-fallback.json': { path: 'fallback.type', message: /discriminator/i },
    '13-section-style-with-permissions.json': {
      path: 'permissions',
      message: /must not declare permissions/i,
    },
    '14-unknown-field.json': { path: /.+/, message: /unrecognized|extraField/i },
  };

  it.each(Object.entries(expectations))(
    '%s yields an actionable message',
    (name, { path: expectedPath, message }) => {
      const result = validateManifest(loadFixture('invalid', name));
      const matching = result.issues.find(
        (issue) =>
          (expectedPath instanceof RegExp
            ? expectedPath.test(issue.path)
            : issue.path === expectedPath) && message.test(issue.message),
      );
      expect(
        matching,
        `expected an issue at "${String(expectedPath)}" matching ${message} but got ${JSON.stringify(
          result.issues,
        )}`,
      ).toBeDefined();
    },
  );
});