/**
 * Unit tests for utility functions, particularly validation functions
 */
import {
  validateOllamaUrl,
  validateModelName,
  validatePluginSettings,
  safeParseJson,
  isValidHttpUrl,
} from '../src/utils';

describe('Validation Functions', () => {
  describe('validateOllamaUrl', () => {
    it('should accept valid HTTP URLs', () => {
      expect(validateOllamaUrl('http://localhost:11434').valid).toBe(true);
      expect(validateOllamaUrl('https://ollama.example.com').valid).toBe(true);
      expect(validateOllamaUrl('http://192.168.1.100:8080').valid).toBe(true);
    });

    it('should reject invalid URLs', () => {
      const invalidUrl = validateOllamaUrl('not-a-url');
      expect(invalidUrl.valid).toBe(false);
      expect(invalidUrl.error).toContain('valid HTTP or HTTPS URL');
    });

    it('should reject URLs ending with slash', () => {
      const urlWithSlash = validateOllamaUrl('http://localhost:11434/');
      expect(urlWithSlash.valid).toBe(false);
      expect(urlWithSlash.error).toContain('should not end with a slash');
    });

    it('should reject empty URLs', () => {
      const emptyUrl = validateOllamaUrl('');
      expect(emptyUrl.valid).toBe(false);
      expect(emptyUrl.error).toContain('cannot be empty');
    });

    it('should reject non-string inputs', () => {
      const nonString = validateOllamaUrl(123 as any);
      expect(nonString.valid).toBe(false);
    });

    it('should trim whitespace from URLs', () => {
      expect(validateOllamaUrl('  http://localhost:11434  ').valid).toBe(true);
    });
  });

  describe('validateModelName', () => {
    it('should accept valid model names', () => {
      expect(validateModelName('llama3').valid).toBe(true);
      expect(validateModelName('llama-2').valid).toBe(true);
      expect(validateModelName('llama.2').valid).toBe(true);
      expect(validateModelName('llama_2').valid).toBe(true);
      expect(validateModelName('llama-2-7b-instruct').valid).toBe(true);
    });

    it('should reject invalid model names', () => {
      const invalidModel = validateModelName('llama@2');
      expect(invalidModel.valid).toBe(false);
      expect(invalidModel.error).toContain(
        'only contain letters, numbers, dots, dashes, and underscores'
      );
    });

    it('should reject empty model names', () => {
      const emptyModel = validateModelName('');
      expect(emptyModel.valid).toBe(false);
      expect(emptyModel.error).toContain('cannot be empty');
    });

    it('should reject model names that are too short', () => {
      const shortModel = validateModelName('a');
      expect(shortModel.valid).toBe(false);
      expect(shortModel.error).toContain('at least 2 characters long');
    });

    it('should reject model names that are too long', () => {
      const longModel = validateModelName('a'.repeat(101));
      expect(longModel.valid).toBe(false);
      expect(longModel.error).toContain('less than 100 characters long');
    });

    it('should reject non-string inputs', () => {
      const nonString = validateModelName(123 as any);
      expect(nonString.valid).toBe(false);
    });

    it('should trim whitespace from model names', () => {
      expect(validateModelName('  llama3  ').valid).toBe(true);
    });
  });

  describe('validatePluginSettings', () => {
    it('should return empty array for valid settings', () => {
      const errors = validatePluginSettings({
        ollamaUrl: 'http://localhost:11434',
        model: 'llama3',
        lastIndexTime: 0,
      });
      expect(errors).toEqual([]);
    });

    it('should report URL validation errors', () => {
      const errors = validatePluginSettings({
        ollamaUrl: 'invalid-url',
        model: 'llama3',
        lastIndexTime: 0,
      });
      expect(errors.length).toBe(1);
      expect(errors[0]).toContain('Ollama URL');
    });

    it('should report model validation errors', () => {
      const errors = validatePluginSettings({
        ollamaUrl: 'http://localhost:11434',
        model: 'invalid@model',
        lastIndexTime: 0,
      });
      expect(errors.length).toBe(1);
      expect(errors[0]).toContain('Model');
    });

    it('should report multiple validation errors', () => {
      const errors = validatePluginSettings({
        ollamaUrl: 'invalid-url',
        model: 'invalid@model',
        lastIndexTime: 0,
      });
      expect(errors.length).toBe(2);
      expect(errors[0]).toContain('Ollama URL');
      expect(errors[1]).toContain('Model');
    });
  });

  describe('safeParseJson', () => {
    it('should parse valid JSON', () => {
      const result = safeParseJson('{"key": "value"}');
      expect(result).toEqual({ key: 'value' });
    });

    it('should throw on invalid JSON', () => {
      expect(() => safeParseJson('{invalid json}')).toThrow('Invalid JSON');
    });

    it('should throw on code injection patterns', () => {
      expect(() => safeParseJson('{"constructor": "function(){}"}')).toThrow('dangerous');
      expect(() => safeParseJson('{"prototype": "something"}')).toThrow('dangerous');
      expect(() => safeParseJson('{"__proto__": "something"}')).toThrow('dangerous');
      expect(() => safeParseJson('{"function": "alert"}')).toThrow('dangerous');
    });

    it('should throw on deeply nested JSON', () => {
      const deeplyNested = JSON.stringify({ value: 1 });
      let current = deeplyNested;
      for (let i = 0; i < 25; i++) {
        current = `{ "nested": ${current} }`;
      }
      expect(() => safeParseJson(current)).toThrow('nesting too deep');
    });

    it('should throw on very large JSON', () => {
      const largeJson = '"' + 'x'.repeat(1000001) + '"'; // 1,000,001 characters
      expect(() => safeParseJson(largeJson)).toThrow('input too large');
    });

    it('should handle string vs object arguments correctly', () => {
      const stringArgs = '{"path": "test.md", "content": "test"}';
      const objectArgs = { path: 'test.md', content: 'test' };

      const stringResult = safeParseJson(stringArgs);
      const objectResult = safeParseJson(JSON.stringify(objectArgs));

      expect(stringResult).toEqual(objectResult);
    });

    it('should throw on non-string input', () => {
      expect(() => safeParseJson(123 as any)).toThrow('Input must be a string');
    });
  });

  describe('isValidHttpUrl', () => {
    it('should accept valid HTTP URLs', () => {
      expect(isValidHttpUrl('http://localhost:11434')).toBe(true);
      expect(isValidHttpUrl('https://example.com')).toBe(true);
    });

    it('should reject non-HTTP URLs', () => {
      expect(isValidHttpUrl('ftp://example.com')).toBe(false);
      expect(isValidHttpUrl('file:///path')).toBe(false);
    });

    it('should reject invalid URLs', () => {
      expect(isValidHttpUrl('not-a-url')).toBe(false);
      expect(isValidHttpUrl('')).toBe(false);
    });
  });
});