/**
 * Config Parser Tests
 *
 * Tests for configuration parsing and validation.
 */

import { describe, it, expect } from 'vitest';
import {
  configParser,
  ConfigParseError,
  ConfigValidationError,
} from '../src/lib/config-parser';
import type { OpenFangConfig } from '../src/types/config';

describe('configParser', () => {
  const validToml = `
# Valid OpenFang configuration
[server]
host = "127.0.0.1"
port = 4200

websocket_port = 4200
websocket_path = "/ws"

[agent.defaults]
workspace = "~/.openfang/workspace"
default_model = "gpt-4"

[llm]
default_provider = "openai"
default_model = "gpt-4"
`;

  describe('parseConfig', () => {
    it('should parse valid TOML configuration', () => {
      const config = configParser.parseConfig(validToml);

      expect(config).toBeDefined();
      expect(config.server).toEqual({
        host: '127.0.0.1',
        port: 4200,
        websocket_port: 4200,
        websocket_path: '/ws',
      });
      expect(config.agent).toBeDefined();
      expect(config.agent.defaults).toEqual({
        workspace: '~/.openfang/workspace',
        default_model: 'gpt-4',
      });
      expect(config.llm).toEqual({
        default_provider: 'openai',
        default_model: 'gpt-4',
      });
    });

  });

  describe('validateConfig', () => {
    it('should validate correct configuration', () => {
      const config: OpenFangConfig = {
        server: {
          host: '127.0.0.1',
          port: 4200,
        },
        agent: {
          defaults: {
            workspace: '~/.openfang/workspace',
            default_model: 'gpt-4',
          },
        },
        llm: {
          default_provider: 'openai',
          default_model: 'gpt-4',
        },
      };

      const result = configParser.validateConfig(config);

      expect(result.valid).toBe(true);
      expect(result.errors).toHaveLength(0);
    });

    it('should detect missing required fields', () => {
      const config = {
        server: {
          host: '127.0.0.1',
          // missing port
        },
      };

      const result = configParser.validateConfig(config);

      expect(result.valid).toBe(false);
      expect(result.errors.length).toBeGreaterThan(0);
    });

    it('should validate port range', () => {
      const config = {
        server: {
          host: '127.0.0.1',
          port: 99999, // invalid port
        },
        agent: {
          defaults: {
            workspace: '~/.openfang/workspace',
            default_model: 'gpt-4',
          },
        },
        llm: {
          default_provider: 'openai',
          default_model: 'gpt-4',
        },
      };

      const result = configParser.validateConfig(config);

      expect(result.valid).toBe(false);
      const portError = result.errors.find(e => e.path === 'server.port');
      expect(portError).toBeDefined();
    });

    it('should detect empty required fields', () => {
      const config = {
        server: {
          host: '',
          port: 4200,
        },
        agent: {
          defaults: {
            workspace: '~/.openfang/workspace',
            default_model: '',
          },
        },
        llm: {
          default_provider: '',
          default_model: 'gpt-4',
        },
      };

      const result = configParser.validateConfig(config);

      expect(result.valid).toBe(false);
    });
  });

  describe('parseAndValidate', () => {
    it('should parse and validate valid configuration', () => {
      const config = configParser.parseAndValidate(validToml);
      expect(config).toBeDefined();
      expect(config.server.host).toBe('127.0.0.1');
    });

    it('should throw on invalid configuration', () => {
      const invalidToml = `
[server]
host = "127.0.0.1"
# missing port
`;

      expect(() => configParser.parseAndValidate(invalidToml)).toThrow(ConfigValidationError);
    });
  });

  describe('stringifyConfig', () => {
    it('should stringify configuration to TOML', () => {
      const config: OpenFangConfig = {
        server: {
          host: '127.0.0.1',
          port: 4200,
        },
        agent: {
          defaults: {
            workspace: '~/.openfang/workspace',
            default_model: 'gpt-4',
          },
        },
        llm: {
          default_provider: 'openai',
          default_model: 'gpt-4',
        },
      };

      const result = configParser.stringifyConfig(config);
      expect(result).toContain('host = "127.0.0.1"');
      expect(result).toContain('port = 4200');
    });
  });

  describe('extractMetadata', () => {
    it('should extract metadata from TOML content', () => {
      const content = `
[server]
host = "127.0.0.1"
port = 4200

[llm.providers]
api_key = "\${API_KEY}"
`;
      const metadata = configParser.extractMetadata(content, '/path/to/config.toml');

      expect(metadata.path).toBe('/path/to/config.toml');
      expect(metadata.name).toBe('config.toml');
      expect(metadata.envVars).toContain('API_KEY');
      expect(metadata.hasUnresolvedEnvVars).toBe(true);
    });

    it('should detect no env vars when none present', () => {
      const content = `
[server]
host = "127.0.0.1"
port = 4200
`;
      const metadata = configParser.extractMetadata(content, '/path/to/config.toml');

      expect(metadata.envVars).toEqual([]);
      expect(metadata.hasUnresolvedEnvVars).toBe(false);
    });
  });

  describe('mergeWithDefaults', () => {
    it('should merge partial config with defaults', () => {
      const partial = {
        server: {
          port: 3000,
        },
      };

      const result = configParser.mergeWithDefaults(partial);

      expect(result.server?.port).toBe(3000);
      expect(result.server?.host).toBe('127.0.0.1'); // from defaults
    });
  });

  describe('isOpenFangConfig', () => {
    it('should return true for valid config', () => {
      const config: OpenFangConfig = {
        server: {
          host: '127.0.0.1',
          port: 4200,
        },
        agent: {
          defaults: {
            workspace: '~/.openfang/workspace',
            default_model: 'gpt-4',
          },
        },
        llm: {
          default_provider: 'openai',
          default_model: 'gpt-4',
        },
      };

      expect(configParser.isOpenFangConfig(config)).toBe(true);
    });

    it('should return false for invalid config', () => {
      expect(configParser.isOpenFangConfig(null)).toBe(false);
      expect(configParser.isOpenFangConfig({})).toBe(false);
    });
  });
});