/**
 * Smoke tests for the BUILT bundles in dist/.
 *
 * Every other suite runs against src/ through ts-jest, where the platform
 * modules resolve as ordinary relative paths. That masked a bug in which the
 * published package loaded fine but threw "Cannot find module './node'" as soon
 * as anything touched the platform layer — rollup flattens the modules, so the
 * runtime require had nothing to resolve. The client could not be constructed
 * at all from the npm package.
 *
 * These tests exercise the artefact that actually ships. Run `npm run build`
 * first; they skip themselves if dist/ is absent.
 */

import * as fs from 'fs';
import * as path from 'path';
import { spawnSync } from 'child_process';

const DIST = path.join(__dirname, '..', '..', 'dist');
const NODE_CJS = path.join(DIST, 'node', 'index.js');
const BROWSER_CJS = path.join(DIST, 'browser', 'index.cjs');
const ESM_ENTRY = path.join(DIST, 'esm', 'index.mjs');

const built = fs.existsSync(NODE_CJS);
const describeIfBuilt = built ? describe : describe.skip;

if (!built) {
    // eslint-disable-next-line no-console
    console.warn('dist/ not found — run `npm run build` to exercise the bundle smoke tests');
}

interface NomyoModule {
    SecureChatCompletion: new (config?: object) => { dispose(): void };
    SecureCompletionClient: new (config: object) => { dispose(): void };
    getMemoryProtectionInfo: () => { method: string; canLock: boolean };
    AttestationPolicy: new (options?: object) => { enforce: boolean };
    SecurityError: new (message: string) => Error;
}

describeIfBuilt('built Node bundle', () => {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const nomyo = require(NODE_CJS) as NomyoModule;

    test('exposes the public API', () => {
        expect(typeof nomyo.SecureChatCompletion).toBe('function');
        expect(typeof nomyo.SecureCompletionClient).toBe('function');
        expect(typeof nomyo.getMemoryProtectionInfo).toBe('function');
        expect(typeof nomyo.AttestationPolicy).toBe('function');
    });

    test('constructs a client — the platform layer resolves', () => {
        // This is the exact call that threw "Cannot find module './node'"
        const client = new nomyo.SecureChatCompletion({});
        expect(client).toBeTruthy();
        client.dispose();
    });

    test('constructs the low-level client too', () => {
        const client = new nomyo.SecureCompletionClient({
            routerUrl: 'https://router.test',
            keyRotationInterval: 0,
        });
        expect(client).toBeTruthy();
        client.dispose();
    });

    test('reaches the real secure-memory implementation', () => {
        const info = nomyo.getMemoryProtectionInfo();
        expect(['mlock', 'zero-only', 'none']).toContain(info.method);
        expect(typeof info.canLock).toBe('boolean');
    });

    test('carries no unresolved runtime requires', () => {
        const source = fs.readFileSync(NODE_CJS, 'utf-8');
        // './node' / './browser' only ever resolved pre-bundling
        expect(source).not.toMatch(/require\(['"]\.\/node['"]\)/);
        expect(source).not.toMatch(/require\(['"]\.\/browser['"]\)/);
    });

    test('attestation policy survives bundling', () => {
        const policy = new nomyo.AttestationPolicy({ enforce: true });
        expect(policy.enforce).toBe(true);
    });
});

describeIfBuilt('built browser bundle', () => {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const nomyo = require(BROWSER_CJS) as NomyoModule;

    test('exposes the public API', () => {
        expect(typeof nomyo.SecureChatCompletion).toBe('function');
        expect(typeof nomyo.getMemoryProtectionInfo).toBe('function');
    });

    test('constructs a client without a DOM', () => {
        const client = new nomyo.SecureChatCompletion({});
        expect(client).toBeTruthy();
        client.dispose();
    });

    test('reports browser memory protection', () => {
        const info = nomyo.getMemoryProtectionInfo();
        expect(info.canLock).toBe(false);
        expect(info.method).toBe('zero-only');
    });

    test('carries no unresolved runtime requires', () => {
        const source = fs.readFileSync(BROWSER_CJS, 'utf-8');
        expect(source).not.toMatch(/require\(['"]\.\/node['"]\)/);
        expect(source).not.toMatch(/require\(['"]\.\/browser['"]\)/);
    });

    test('does not drag the Node platform layer into the browser build', () => {
        const source = fs.readFileSync(BROWSER_CJS, 'utf-8');
        // The Node HTTP client and the optional native addon must not appear.
        // `fs`/`path` legitimately do: KeyManager has Node-only branches guarded
        // by `typeof window`, shared by both builds.
        for (const nodeOnly of ['https', 'http', 'url', 'nomyo-native', 'node-gyp-build']) {
            expect(source).not.toMatch(
                new RegExp(`require\\(['"]${nodeOnly}['"]\\)`)
            );
        }
    });
});

describeIfBuilt('built ESM entry point', () => {
    test('is real ESM with an unambiguous extension', () => {
        // A .js ES module in a non-"type":"module" package is parsed as
        // CommonJS by Node and fails on older versions
        expect(fs.existsSync(ESM_ENTRY)).toBe(true);
        expect(fs.existsSync(path.join(DIST, 'esm', 'index.js'))).toBe(false);
        expect(fs.readFileSync(ESM_ENTRY, 'utf-8')).toMatch(/^export |[\n;]export /);
    });

    test('shims require() for its lazily-loaded modules', () => {
        // The source loads crypto/fs/path/jose/the native addon via require().
        // `require` is not defined in ES module scope, so the bundle must
        // provide it or those paths throw ReferenceError at runtime.
        const source = fs.readFileSync(ESM_ENTRY, 'utf-8');
        if (/[^.\w]require\(/.test(source)) {
            expect(source).toMatch(/createRequire/);
        }
    });

    test('is importable and usable by a real Node process', () => {
        // Not `await import(...)` — ts-jest compiles dynamic import down to
        // require() for its CommonJS target, which cannot load .mjs and would
        // test the compiler rather than the bundle. Spawn Node instead.
        const script = `import(${JSON.stringify(ESM_ENTRY)})`
            + '.then(m => {'
            + '  const c = new m.SecureChatCompletion({}); c.dispose();'
            // Touches the require()-dependent crypto path
            + '  if (typeof m.getMemoryProtectionInfo().method !== "string") process.exit(2);'
            + '})'
            + '.catch(e => { console.error(e.message); process.exit(3); })';

        const result = spawnSync(process.execPath, ['--input-type=module', '-e', script], {
            encoding: 'utf-8',
        });

        expect(result.stderr.trim()).toBe('');
        expect(result.status).toBe(0);
    });
});