/**
 * Unit tests for TokenConfigLoader
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { TokenConfigLoader, TokenConfig, DefaultConfigLoader, DefaultConfig } from '../../src/config.js';

describe('TokenConfigLoader', () => {
  const originalEnv = { ...process.env };

  beforeEach(() => {
    process.env = { ...originalEnv };
    delete process.env.BITBUCKET_MCP_TOKEN;
    delete process.env.DEFAULT_WORKSPACE;
    delete process.env.DEFAULT_REPO;
  });

  afterEach(() => {
    process.env = originalEnv;
    vi.restoreAllMocks();
  });

  describe('token validation', () => {
    it('should accept valid tokens (alphanumeric with special chars)', () => {
      const validPattern = /^[A-Za-z0-9=._-]+$/;
      
      expect(validPattern.test('abc123def45678901234567')).toBe(true);
      expect(validPattern.test('ATBB1234567890abcdefgh')).toBe(true);
      expect(validPattern.test('Bearer_token.with=chars12')).toBe(true);
        expect(validPattern.test('a'.repeat(20))).toBe(true);
    });

    it('should reject tokens that are too short', () => {
      const shortToken = 'abc123';
      expect(shortToken.length).toBeLessThan(20);
      });

    it('should reject tokens with invalid characters', () => {
      const invalidToken = 'token with spaces!@#$%';
      const validPattern = /^[A-Za-z0-9=._-]+$/;
      expect(validPattern.test(invalidToken)).toBe(false);
    });
  });

  describe('environment variable loading', () => {
    it('should load token from BITBUCKET_MCP_TOKEN env var', async () => {
      process.env.BITBUCKET_MCP_EMAIL = 'test@example.com';
      process.env.BITBUCKET_MCP_TOKEN = 'valid_test_token_12345678901234567';

      const config = await TokenConfigLoader.load();

      expect(config.token).toBe('valid_test_token_12345678901234567');
      expect(config.source).toBe('env');
    });
  });

  describe('TokenConfig interface', () => {
    it('should return correct config structure for env source', async () => {
      process.env.BITBUCKET_MCP_TOKEN = 'test_token_12345678901234567';

      const config = await TokenConfigLoader.load();

      expect(config).toHaveProperty('token');
      expect(config).toHaveProperty('source');
      expect(['env', 'dotenv', 'prompt']).toContain(config.source);
    });
  });
});

describe('DefaultConfigLoader', () => {
  const originalEnv = { ...process.env };

  beforeEach(() => {
    process.env = { ...originalEnv };
    delete process.env.DEFAULT_WORKSPACE;
    delete process.env.DEFAULT_REPO;
  });

  afterEach(() => {
    process.env = originalEnv;
  });

  describe('load', () => {
    it('should return null values when env vars are not set', () => {
      const config = DefaultConfigLoader.load();

      expect(config.workspace).toBeNull();
      expect(config.repo).toBeNull();
    });

    it('should return workspace and repo from env vars when set', () => {
      process.env.DEFAULT_WORKSPACE = 'my-workspace';
      process.env.DEFAULT_REPO = 'my-repo';

      const config = DefaultConfigLoader.load();

      expect(config.workspace).toBe('my-workspace');
      expect(config.repo).toBe('my-repo');
    });

    it('should return partial config when only workspace is set', () => {
      process.env.DEFAULT_WORKSPACE = 'only-workspace';

      const config = DefaultConfigLoader.load();

      expect(config.workspace).toBe('only-workspace');
      expect(config.repo).toBeNull();
    });

    it('should return partial config when only repo is set', () => {
      process.env.DEFAULT_REPO = 'only-repo';

      const config = DefaultConfigLoader.load();

      expect(config.workspace).toBeNull();
      expect(config.repo).toBe('only-repo');
    });
  });

  describe('getWorkspace', () => {
    it('should return null when DEFAULT_WORKSPACE is not set', () => {
      expect(DefaultConfigLoader.getWorkspace()).toBeNull();
    });

    it('should return workspace value when set', () => {
      process.env.DEFAULT_WORKSPACE = 'test-workspace';
      expect(DefaultConfigLoader.getWorkspace()).toBe('test-workspace');
    });
  });

  describe('getRepo', () => {
    it('should return null when DEFAULT_REPO is not set', () => {
      expect(DefaultConfigLoader.getRepo()).toBeNull();
    });

    it('should return repo value when set', () => {
      process.env.DEFAULT_REPO = 'test-repo';
      expect(DefaultConfigLoader.getRepo()).toBe('test-repo');
    });
  });
});