import { describe, it, expect, beforeEach } from 'vitest';
import { ToolRegistry, defineTool } from './registry.js';
import { generateOpenAPIPaths } from './openapi.js';
import type { OASPathsResult } from './openapi.js';

// ---------------------------------------------------------------------------
// Fixtures
// ---------------------------------------------------------------------------

const lookupWorkOrder = defineTool({
  name: 'lookup-work-order',
  description: 'Look up a work order by ID.',
  tier: 'ops',
  requiredScope: 'ops:read',
  inputSchema: {
    type: 'object',
    required: ['workOrderId'],
    properties: {
      workOrderId: { type: 'string', description: 'The work order ID.' },
    },
    additionalProperties: false,
  },
  handler: async (_input, _ctx) => ({ id: 'WO-001', status: 'open' }),
});

const searchVendors = defineTool({
  name: 'search-vendors',
  description: 'Search vendors in QuickBooks Online.',
  tier: 'finance',
  requiredScope: 'finance:read',
  inputSchema: {
    type: 'object',
    required: ['query'],
    properties: {
      query: { type: 'string', description: 'Vendor name or keyword.' },
      limit: { type: 'integer', default: 10 },
    },
    additionalProperties: false,
  },
  handler: async (_input, _ctx) => ({ vendors: [] }),
});

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function buildRegistry(...tools: ReturnType<typeof defineTool>[]): ToolRegistry {
  const reg = new ToolRegistry();
  for (const t of tools) reg.register(t);
  return reg;
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

describe('generateOpenAPIPaths', () => {
  let result: OASPathsResult;

  beforeEach(() => {
    const registry = buildRegistry(lookupWorkOrder, searchVendors);
    result = generateOpenAPIPaths(registry);
  });

  // -------------------------------------------------------------------------
  // Basic structure
  // -------------------------------------------------------------------------

  it('produces a paths object', () => {
    expect(result).toHaveProperty('paths');
    expect(typeof result.paths).toBe('object');
  });

  it('produces one path per registered tool', () => {
    expect(Object.keys(result.paths)).toHaveLength(2);
  });

  it('generates the correct path key for each tool', () => {
    expect(result.paths).toHaveProperty('/tools/lookup-work-order');
    expect(result.paths).toHaveProperty('/tools/search-vendors');
  });

  // -------------------------------------------------------------------------
  // POST operation structure
  // -------------------------------------------------------------------------

  it('wraps each tool in a POST operation', () => {
    const pathItem = result.paths['/tools/lookup-work-order']!;
    expect(pathItem).toHaveProperty('post');
    expect(pathItem).not.toHaveProperty('get');
  });

  it('sets operationId to the tool name', () => {
    expect(result.paths['/tools/lookup-work-order']!.post.operationId).toBe('lookup-work-order');
  });

  it('sets summary to the tool description', () => {
    expect(result.paths['/tools/lookup-work-order']!.post.summary).toBe(
      'Look up a work order by ID.',
    );
  });

  // -------------------------------------------------------------------------
  // Tags and security
  // -------------------------------------------------------------------------

  it('tags an ops tool with ["ops"]', () => {
    expect(result.paths['/tools/lookup-work-order']!.post.tags).toEqual(['ops']);
  });

  it('tags a finance tool with ["finance"]', () => {
    expect(result.paths['/tools/search-vendors']!.post.tags).toEqual(['finance']);
  });

  it('adds bearerAuth security requirement to every operation', () => {
    const op = result.paths['/tools/lookup-work-order']!.post;
    expect(op.security).toEqual([{ bearerAuth: [] }]);
  });

  it('sets x-required-scope extension from the tool definition', () => {
    expect(result.paths['/tools/lookup-work-order']!.post['x-required-scope']).toBe('ops:read');
    expect(result.paths['/tools/search-vendors']!.post['x-required-scope']).toBe('finance:read');
  });

  // -------------------------------------------------------------------------
  // Request body
  // -------------------------------------------------------------------------

  it('marks requestBody as required', () => {
    const op = result.paths['/tools/lookup-work-order']!.post;
    expect(op.requestBody.required).toBe(true);
  });

  it('uses application/json for the requestBody media type', () => {
    const op = result.paths['/tools/lookup-work-order']!.post;
    expect(op.requestBody.content).toHaveProperty('application/json');
  });

  it('round-trips the tool inputSchema verbatim into the requestBody', () => {
    const op = result.paths['/tools/lookup-work-order']!.post;
    expect(op.requestBody.content['application/json'].schema).toEqual(lookupWorkOrder.inputSchema);
  });

  it('round-trips the finance tool inputSchema verbatim', () => {
    const op = result.paths['/tools/search-vendors']!.post;
    expect(op.requestBody.content['application/json'].schema).toEqual(searchVendors.inputSchema);
  });

  // -------------------------------------------------------------------------
  // Responses
  // -------------------------------------------------------------------------

  it('includes a 200 response', () => {
    const responses = result.paths['/tools/lookup-work-order']!.post.responses;
    expect(responses).toHaveProperty('200');
  });

  it('200 response has application/json content', () => {
    const r200 = result.paths['/tools/lookup-work-order']!.post.responses['200']!;
    expect(r200.content).toHaveProperty('application/json');
  });

  it('includes a 403 response for scope errors', () => {
    const responses = result.paths['/tools/lookup-work-order']!.post.responses;
    expect(responses).toHaveProperty('403');
  });

  it('403 response schema has requiredScope property', () => {
    const r403 = result.paths['/tools/lookup-work-order']!.post.responses['403']!;
    const schema = r403.content!['application/json'].schema as {
      properties: Record<string, unknown>;
    };
    expect(schema.properties).toHaveProperty('requiredScope');
  });

  it('includes a 401 response for missing/invalid token', () => {
    const responses = result.paths['/tools/lookup-work-order']!.post.responses;
    expect(responses).toHaveProperty('401');
  });

  // -------------------------------------------------------------------------
  // Components / security schemes
  // -------------------------------------------------------------------------

  it('includes a bearerAuth security scheme in components', () => {
    expect(result.components.securitySchemes).toHaveProperty('bearerAuth');
    expect(result.components.securitySchemes.bearerAuth.type).toBe('http');
    expect(result.components.securitySchemes.bearerAuth.scheme).toBe('bearer');
    expect(result.components.securitySchemes.bearerAuth.bearerFormat).toBe('JWT');
  });

  // -------------------------------------------------------------------------
  // Empty registry
  // -------------------------------------------------------------------------

  it('produces an empty paths object for an empty registry', () => {
    const empty = generateOpenAPIPaths(new ToolRegistry());
    expect(Object.keys(empty.paths)).toHaveLength(0);
  });

  // -------------------------------------------------------------------------
  // Round-trip: registry → paths → verify all tools represented
  // -------------------------------------------------------------------------

  it('round-trip: every registered tool appears exactly once in paths', () => {
    const tools = [
      defineTool({
        name: 'create-task',
        description: 'Create a task.',
        tier: 'ops',
        requiredScope: 'ops:tasks',
        inputSchema: {
          type: 'object',
          required: ['title'],
          properties: { title: { type: 'string' } },
        },
        handler: async () => ({ id: 'T-1' }),
      }),
      defineTool({
        name: 'lookup-payment-by-vendor',
        description: 'Look up payments by vendor.',
        tier: 'finance',
        requiredScope: 'finance:read',
        inputSchema: {
          type: 'object',
          required: ['vendorName'],
          properties: { vendorName: { type: 'string' } },
        },
        handler: async () => ({ payments: [] }),
      }),
    ];
    const reg = buildRegistry(...tools);
    const out = generateOpenAPIPaths(reg);
    const paths = Object.keys(out.paths);
    expect(paths).toContain('/tools/create-task');
    expect(paths).toContain('/tools/lookup-payment-by-vendor');
    expect(paths).toHaveLength(2);
  });
});

// ---------------------------------------------------------------------------
// ToolRegistry — defineTool and registry unit tests
// ---------------------------------------------------------------------------

describe('ToolRegistry', () => {
  it('registers and lists a tool', () => {
    const reg = new ToolRegistry();
    reg.register(lookupWorkOrder);
    expect(reg.list()).toHaveLength(1);
    expect(reg.list()[0]!.name).toBe('lookup-work-order');
  });

  it('get() returns a registered tool by name', () => {
    const reg = new ToolRegistry();
    reg.register(lookupWorkOrder);
    const found = reg.get('lookup-work-order');
    expect(found).toBeDefined();
    expect(found!.name).toBe('lookup-work-order');
  });

  it('get() returns undefined for unknown tool', () => {
    const reg = new ToolRegistry();
    expect(reg.get('nonexistent')).toBeUndefined();
  });

  it('throws on duplicate tool name', () => {
    const reg = new ToolRegistry();
    reg.register(lookupWorkOrder);
    expect(() => reg.register(lookupWorkOrder)).toThrow(/duplicate tool name/);
  });

  it('register() is chainable', () => {
    const reg = new ToolRegistry();
    reg.register(lookupWorkOrder).register(searchVendors);
    expect(reg.size).toBe(2);
  });

  it('size reflects the number of registered tools', () => {
    const reg = new ToolRegistry();
    expect(reg.size).toBe(0);
    reg.register(lookupWorkOrder);
    expect(reg.size).toBe(1);
  });
});

describe('defineTool', () => {
  it('returns the definition unchanged', () => {
    const def = defineTool(lookupWorkOrder);
    expect(def).toBe(lookupWorkOrder);
  });
});