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

describe('SSH Key Integration', () => {
  describe('Key format validation', () => {
    it('should validate OpenSSH format magic bytes', () => {
      const magic = 'openssh-key-v1\0';
      const magicBytes = new TextEncoder().encode(magic);

      expect(magicBytes.length).toBe(15);
      expect(magicBytes[14]).toBe(0);
    });

    it('should parse key type from OpenSSH format', () => {
      const keyType = 'ssh-ed25519';
      const keyTypeBytes = new TextEncoder().encode(keyType);

      expect(keyTypeBytes.length).toBeGreaterThan(0);
      expect(keyType).toMatch(/^ssh-(ed25519|rsa|ecdsa-sha2-nistp\d+)$/);
    });
  });

  describe('DER encoding', () => {
    it('should encode DER INTEGER correctly', () => {
      const value = 42;
      const encoded = new Uint8Array([0x02, 0x01, value]);

      expect(encoded[0]).toBe(0x02);
      expect(encoded[1]).toBe(0x01);
      expect(encoded[2]).toBe(42);
    });

    it('should encode DER SEQUENCE correctly', () => {
      const contents = new Uint8Array([0x01, 0x02, 0x03]);
      const encoded = new Uint8Array([0x30, contents.length, ...contents]);

      expect(encoded[0]).toBe(0x30);
      expect(encoded[1]).toBe(3);
    });
  });

  describe('Key type detection', () => {
    it('should detect all supported key types', () => {
      const keyTypes = [
        'ssh-ed25519',
        'ssh-rsa',
        'ecdsa-sha2-nistp256',
        'ecdsa-sha2-nistp384',
        'ecdsa-sha2-nistp521',
      ];

      const validPattern = /^(ssh-(ed25519|rsa)|ecdsa-sha2-nistp\d+)$/;

      for (const keyType of keyTypes) {
        expect(keyType).toMatch(validPattern);
      }
    });

    it('should identify supported key types', () => {
      const supportedTypes = [
        'ssh-ed25519',
        'ssh-rsa',
        'ecdsa-sha2-nistp256',
        'ecdsa-sha2-nistp384',
        'ecdsa-sha2-nistp521',
      ];

      const unsupportedTypes = ['ssh-dsa', 'ssh-unknown'];

      for (const type of supportedTypes) {
        const isSupported =
          type === 'ssh-ed25519' || type === 'ssh-rsa' || type.startsWith('ecdsa-sha2-nistp');
        expect(isSupported).toBe(true);
      }

      for (const type of unsupportedTypes) {
        const isSupported =
          type === 'ssh-ed25519' || type === 'ssh-rsa' || type.startsWith('ecdsa-sha2-nistp');
        expect(isSupported).toBe(false);
      }
    });
  });

  describe('Error handling', () => {
    it('should handle invalid magic bytes', () => {
      const invalidMagic = 'invalid-format\0';
      const magic = 'openssh-key-v1\0';

      expect(invalidMagic).not.toBe(magic);
    });

    it('should handle encrypted keys', () => {
      const cipherName = 'aes256-ctr';
      const unencrypted = 'none';

      expect(cipherName).not.toBe(unencrypted);
    });
  });
});