import { afterAll, describe, expect, it } from 'bun:test';
import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { discoverPlugins } from './discover';

// Discovery against a real tree, because every assertion here is about the FILESYSTEM being the
// declaration. Mocking `existsSync` would test the mock.

const root = mkdtempSync(join(tmpdir(), 'officer-plugins-'));
afterAll(() => rmSync(root, { recursive: true, force: true }));

const MANIFEST = (over = '') => `export const manifest = {
  publisher: 'officerdev', version: '1.0.0', platform: '>=1.0.0',
  label: 'X', summary: 'x', icon: 'Network', color: '#fff',
  permissions: [], ${over}
};`;

function plant(appName: string, files: Record<string, string>) {
  const dir = join(root, appName);
  for (const [rel, body] of Object.entries(files)) {
    const full = join(dir, rel);
    mkdirSync(join(full, '..'), { recursive: true });
    writeFileSync(full, body);
  }
  return dir;
}

plant('full', {
  'manifest.ts': MANIFEST(),
  'api/router.ts': 'export const router = {};',
  'db/schema.ts': 'export const t = {};',
  'sidecar/index.ts': 'export {};',
  'web/panels.ts': 'export const appRegistryMetas = [];',
  'web/layout.ts': 'export const defaultLayout = {};',
});
plant('bare', { 'manifest.ts': MANIFEST() });
plant('nodeish', { 'manifest.ts': MANIFEST(), 'sidecar/index.mjs': 'export {};' });
plant('broken', { 'manifest.ts': 'export const manifest = { publisher: 1 };' });
// A frontend that is not a workspace. The rule: every plugin route renders a Workspace with at least one
// panel, enforced here rather than by review — a `web/` directory without both files is refused.
plant('halfweb', { 'manifest.ts': MANIFEST(), 'web/panels.ts': 'export const appRegistryMetas = [];' });
plant('nomanifest', { 'api/router.ts': 'export const router = {};' });
plant('_scratch', { 'manifest.ts': MANIFEST() });

describe('discoverPlugins', () => {
  it('reads what the tree declares, and nothing more', async () => {
    const { plugins } = await discoverPlugins(root);
    const full = plugins.find((p) => p.appName === 'full')!;
    expect(full.api).toContain('api/router.ts');
    expect(full.schema).toContain('db/schema.ts');
    expect(full.sidecar).toEqual({ script: join(root, 'full/sidecar/index.ts'), runtime: 'bun' });
    expect(full.web?.panels).toContain('web/panels.ts');
    expect(full.web?.layout).toContain('web/layout.ts');
  });

  it('a manifest alone is a valid plugin — every other part is optional', async () => {
    const { plugins } = await discoverPlugins(root);
    const bare = plugins.find((p) => p.appName === 'bare')!;
    expect([bare.api, bare.schema, bare.sidecar, bare.web]).toEqual([null, null, null, null]);
  });

  // The runtime is the extension, not a field, so it cannot contradict the file it describes.
  it('reads the runtime off the extension', async () => {
    const { plugins } = await discoverPlugins(root);
    expect(plugins.find((p) => p.appName === 'nodeish')!.sidecar?.runtime).toBe('node');
  });

  it('takes the app name from the directory, so it cannot disagree with where the code sits', async () => {
    const { plugins } = await discoverPlugins(root);
    expect(plugins.map((p) => p.appName)).toContain('full');
  });

  // The property that matters most: one bad plugin must not take the platform down, or hide the good
  // ones beside it. "Broken, and here is why" is renderable; a failed boot is only greppable.
  it('collects broken plugins instead of throwing', async () => {
    const { plugins, broken } = await discoverPlugins(root);
    expect(broken.map((b) => b.appName).sort()).toEqual(['broken', 'halfweb', 'nomanifest']);
    expect(broken.find((b) => b.appName === 'nomanifest')!.error).toContain('no manifest.ts');
    expect(plugins.length).toBeGreaterThan(0);
  });

  // The exclusionary rule, and the reason it is a shape rather than a policy: a plugin cannot ship a
  // frontend that is not a workspace, because it never renders the screen.
  it('refuses a web/ directory that is not panels AND a layout', async () => {
    const { broken } = await discoverPlugins(root);
    const halfweb = broken.find((b) => b.appName === 'halfweb')!;
    expect(halfweb.error).toContain('web/layout.ts');
    expect(halfweb.error).toContain('contribute panels and a layout, not a screen');
  });

  it('skips underscore and dot directories, which are scratch space', async () => {
    const { plugins, broken } = await discoverPlugins(root);
    expect([...plugins, ...broken].map((p) => p.appName)).not.toContain('_scratch');
  });

  it('is empty, not an error, when there is no plugins directory at all', async () => {
    expect(await discoverPlugins(join(root, 'does-not-exist'))).toEqual({ plugins: [], broken: [] });
  });
});