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

describe('JSON Validation with @placeholders@', () => {
  /**
   * Helper function that mimics the validation logic in ConfigTemplate.tsx
   */
  function validateJsonWithPlaceholders(value: string): { valid: boolean; error?: string } {
    try {
      if (!value.trim()) {
        return { valid: true };
      }

      // This is the current implementation from ConfigTemplate.tsx
      // Replace ALL @...@ patterns with "1" (valid for both string and numeric contexts)
      const sanitizedValue = value.replace(/@[^@]+@/g, '1');

      JSON.parse(sanitizedValue);
      return { valid: true };
    } catch (e) {
      return { valid: false, error: (e as Error).message };
    }
  }

  it('should validate quoted placeholders', () => {
    const json = `{
      "Host": "@host@",
      "Port": "@port@"
    }`;
    
    const result = validateJsonWithPlaceholders(json);
    expect(result.valid).toBe(true);
  });

  it('should validate unquoted placeholders', () => {
    const json = `{
      "Host": "@host@",
      "Port": @port@
    }`;
    
    const result = validateJsonWithPlaceholders(json);
    expect(result.valid).toBe(true);
  });

  it('should validate mixed quoted and unquoted placeholders', () => {
    const json = `{
      "Host": "@host@",
      "Port": @port@,
      "ApiPath": "@host@:@port@/v1/data",
      "MessageBroker": {
        "hosts": @MessageBrokerHosts@
      }
    }`;
    
    const result = validateJsonWithPlaceholders(json);
    expect(result.valid).toBe(true);
  });

  it('should validate placeholders inside strings (URLs)', () => {
    const json = `{
      "ApiUrl": "http://@host@:@port@/api"
    }`;
    
    const result = validateJsonWithPlaceholders(json);
    expect(result.valid).toBe(true);
  });

  it('should validate complex real-world template', () => {
    const json = `{
      "Host": "@host@",
      "Port": @port@,

      "ApiPath": "@host@:@port@/v1/data",

      "MessageBroker": {
        "hosts": @MessageBrokerHosts@
      },

      "basePath": "./@env_name@/in",

      "NoParam": "@no_param@"
    }`;
    
    const result = validateJsonWithPlaceholders(json);
    expect(result.valid).toBe(true);
  });

  it('should reject invalid JSON structure', () => {
    const json = `{
      "Host": "@host@",
      "Port": @port@
      "Missing": "comma"
    }`;
    
    const result = validateJsonWithPlaceholders(json);
    expect(result.valid).toBe(false);
    expect(result.error).toContain('Expected');
  });

  it('should handle empty value', () => {
    const result = validateJsonWithPlaceholders('');
    expect(result.valid).toBe(true);
  });

  it('should handle whitespace only', () => {
    const result = validateJsonWithPlaceholders('   \n\t  ');
    expect(result.valid).toBe(true);
  });
});