/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import { describe, expect, it, beforeEach } from 'vitest';
import type { Resource } from '@modelcontextprotocol/sdk/types.js';
import { ResourceRegistry } from './resource-registry.js';

describe('ResourceRegistry', () => {
  let registry: ResourceRegistry;

  beforeEach(() => {
    registry = new ResourceRegistry();
  });

  const createResource = (overrides: Partial<Resource> = {}): Resource => ({
    uri: 'file:///tmp/foo.txt',
    name: 'foo',
    description: 'example resource',
    mimeType: 'text/plain',
    ...overrides,
  });

  it('stores resources per server', () => {
    registry.setResourcesForServer('a', [createResource()]);
    registry.setResourcesForServer('b', [createResource({ uri: 'foo' })]);

    expect(
      registry.getAllResources().filter((res) => res.serverName === 'a'),
    ).toHaveLength(1);
    expect(
      registry.getAllResources().filter((res) => res.serverName === 'b'),
    ).toHaveLength(1);
  });

  it('clears resources for server before adding new ones', () => {
    registry.setResourcesForServer('a', [
      createResource(),
      createResource({ uri: 'bar' }),
    ]);
    registry.setResourcesForServer('a', [createResource({ uri: 'baz' })]);

    const resources = registry
      .getAllResources()
      .filter((res) => res.serverName === 'a');
    expect(resources).toHaveLength(1);
    expect(resources[0].uri).toBe('baz');
  });

  it('finds resources by serverName:uri identifier', () => {
    registry.setResourcesForServer('a', [createResource()]);
    registry.setResourcesForServer('b', [
      createResource({ uri: 'file:///tmp/bar.txt' }),
    ]);

    expect(
      registry.findResourceByUri('b:file:///tmp/bar.txt')?.serverName,
    ).toBe('b');
    expect(
      registry.findResourceByUri('a:file:///tmp/foo.txt')?.serverName,
    ).toBe('a');
    expect(registry.findResourceByUri('a:file:///tmp/bar.txt')).toBeUndefined();
    expect(registry.findResourceByUri('nonexistent')).toBeUndefined();
  });

  it('clears resources for a server', () => {
    registry.setResourcesForServer('a', [createResource()]);
    registry.removeResourcesByServer('a');

    expect(
      registry.getAllResources().filter((res) => res.serverName === 'a'),
    ).toHaveLength(0);
  });
});