/**
 * OpenAPI 3.1 document validity (build-plan §5).
 *
 * Asserts the structural invariants of `buildOpenApiDocument`: 3.1 version,
 * one `POST /tools/{name}` per tool carrying `x-required-scope`, and a
 * `bearerAuth` security scheme present (design.md §2.5 — every tool path
 * requires a token).
 */

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

import { ToolRegistry, defineTool } from './registry.js';
import { buildOpenApiDocument } from './openapi.js';
import type { Scope } from './types.js';

function tool(name: string, scope: Scope, tier: 'ops' | 'finance') {
  return defineTool({
    name,
    description: `desc ${name}`,
    tier,
    requiredScope: scope,
    inputSchema: {
      type: 'object',
      properties: { id: { type: 'string' } },
      required: ['id'],
    },
    handler: async () => ({}),
  });
}

function doc() {
  const registry = new ToolRegistry();
  registry.register(tool('lookup_thing', 'ops:read', 'ops'));
  registry.register(tool('lookup_payment', 'finance:read', 'finance'));
  return buildOpenApiDocument(registry, {
    info: { title: 'Test', version: '1.0.0' },
    servers: [{ url: 'http://localhost:8081' }],
  });
}

describe('buildOpenApiDocument', () => {
  it('declares OpenAPI 3.1.0', () => {
    expect(doc().openapi).toBe('3.1.0');
  });

  it('carries info and servers', () => {
    const d = doc();
    expect(d.info.title).toBe('Test');
    expect(d.servers[0]!.url).toBe('http://localhost:8081');
  });

  it('emits exactly one POST /tools/{name} per tool', () => {
    const d = doc();
    expect(Object.keys(d.paths).sort()).toEqual(['/tools/lookup_payment', '/tools/lookup_thing']);
    for (const path of Object.values(d.paths)) {
      expect(path.post).toBeDefined();
    }
  });

  it('annotates each operation with x-required-scope and a JSON request body', () => {
    const op = doc().paths['/tools/lookup_payment']!.post;
    expect(op['x-required-scope']).toBe('finance:read');
    expect(op.requestBody.required).toBe(true);
    expect(op.requestBody.content['application/json'].schema).toBeDefined();
  });

  it('defines the bearerAuth security scheme and applies it document-wide', () => {
    const d = doc();
    expect(d.components.securitySchemes.bearerAuth.scheme).toBe('bearer');
    expect(d.security).toEqual([{ bearerAuth: [] }]);
  });

  it('every operation requires the bearer token (no unauthenticated tool path)', () => {
    for (const path of Object.values(doc().paths)) {
      expect(path.post.security).toContainEqual({ bearerAuth: [] });
    }
  });

  it('produces a scope-filtered document when given a filtered registry', () => {
    const filtered = new ToolRegistry();
    filtered.register(tool('lookup_thing', 'ops:read', 'ops'));
    const d = buildOpenApiDocument(filtered, {
      info: { title: 'Ops', version: '1.0.0' },
      servers: [{ url: 'http://x' }],
    });
    expect(Object.keys(d.paths)).toEqual(['/tools/lookup_thing']);
  });
});