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

describe('JSON Schema Fix Verification', () => {
  it('should demonstrate why required field is necessary', () => {
    // According to JSON Schema specification and Anthropic's tool documentation,
    // when an inputSchema has properties, it should always include a required field
    
    // This is INVALID according to strict JSON Schema validation
    const invalidToolSchema = {
      name: 'list_items',
      description: 'List items with optional filters',
      inputSchema: {
        type: 'object',
        properties: {
          filter: { type: 'string' },
          limit: { type: 'number' }
        }
        // Missing: required: []
      }
    };

    // This is VALID - even with empty required array
    const validToolSchema = {
      name: 'list_items',
      description: 'List items with optional filters', 
      inputSchema: {
        type: 'object',
        properties: {
          filter: { type: 'string' },
          limit: { type: 'number' }
        },
        required: [] // All parameters are optional
      }
    };

    // This is also VALID - with some required parameters
    const validToolSchemaWithRequired = {
      name: 'create_item',
      description: 'Create a new item',
      inputSchema: {
        type: 'object',
        properties: {
          name: { type: 'string' },
          description: { type: 'string' }
        },
        required: ['name'] // name is required, description is optional
      }
    };

    // Verify the schemas
    expect(invalidToolSchema.inputSchema).not.toHaveProperty('required');
    expect(validToolSchema.inputSchema).toHaveProperty('required');
    expect(validToolSchemaWithRequired.inputSchema.required).toContain('name');
  });

  it('should show the pattern for fixing schemas', () => {
    // Before fix:
    const before = `{
      name: 'list_epics',
      description: 'List all epics with optional filtering',
      inputSchema: {
        type: 'object',
        properties: {
          status: {
            type: 'string',
            enum: ['planned', 'active', 'completed', 'cancelled'],
            description: 'Filter by epic status'
          },
          owner: {
            type: 'string',
            description: 'Filter by epic owner'
          },
        },
      },
    }`;

    // After fix:
    const after = `{
      name: 'list_epics',
      description: 'List all epics with optional filtering',
      inputSchema: {
        type: 'object',
        properties: {
          status: {
            type: 'string',
            enum: ['planned', 'active', 'completed', 'cancelled'],
            description: 'Filter by epic status'
          },
          owner: {
            type: 'string',
            description: 'Filter by epic owner'
          },
        },
        required: [], // Added this line - all parameters are optional
      },
    }`;

    // This test just documents the fix pattern
    expect(before).not.toContain('required:');
    expect(after).toContain('required: []');
  });
});