import 'dart:io';
import 'package:teamhydra_idgen/teamhydra_idgen.dart';
import 'package:test/test.dart';

Map<String, String> loadRequiredVarsFromEnv() {
  // Load the .env file from the current directory
  final currentDir = Directory.current;
  final envFile = File('${currentDir.path}/.env');

  if (!envFile.existsSync()) {
    throw Exception(
        'Could not locate the .env file in the current directory (tried path: ${envFile.path})');
  }

  final lines = envFile
      .readAsLinesSync()
      .where((line) => line.isNotEmpty && !line.startsWith('#'))
      .toList(); // Filter out empty lines and comments

  String username = '';
  String token = '';

  // Get the username and token (IDGEN_USERNAME and IDGEN_TOKEN)
  for (final line in lines) {
    if (line.startsWith('IDGEN_USERNAME=')) {
      username = line.split('=')[1].trim();
    } else if (line.startsWith('IDGEN_TOKEN=')) {
      token = line.split('=')[1].trim();
    }
  }

  // Remove " from the strings
  username = username.replaceAll('"', '');
  token = token.replaceAll('"', '');

  if (username.isEmpty || token.isEmpty) {
    throw Exception(
        'IDGEN_USERNAME or IDGEN_TOKEN is missing from the .env file');
  }

  return {'username': username, 'token': token};
}

void main() {
  // Load the .env file and get the username and token
  final env = loadRequiredVarsFromEnv();

  if (env['username'] == null ||
      env['token'] == null ||
      env['username']!.isEmpty ||
      env['token']!.isEmpty) {
    print('Please provide a valid username and token in the .env file');
    exit(1);
  }

  final username = env['username']!;
  final token = env['token']!;

  print(
      "[IDGen] Loaded credentials for username: $username and token (last 4): ${token.substring(token.length - 4)} to run tests");

  group('IDGen', () {
    final idGen = IDGen(username: username, token: token);

    // Ensure it errors when invalid user/token combo is used
    test('Invalid user/token combo', () async {
      final idGen = IDGen(username: 'invalid', token: 'invalid');

      try {
        await idGen.generateUUIDV4();
        fail('Should have thrown an exception');
      } on IDGenException catch (e) {
        expect(e.message,
            'Server rejected ID generation: Invalid username or token');
      } catch (e) {
        fail('Should have thrown an IDGenException');
      }
    });

    // Ensure it generates a UUID V4
    test('Generate UUID V4', () async {
      final response = await idGen.generateUUIDV4();

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 36);
    });

    // Ensure it generates a nanoID
    test('Generate nanoID', () async {
      final response = await idGen.generateNanoID();

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 10);
    });

    // Ensure it generates a nanoID with a custom size
    test('Generate nanoID with custom size', () async {
      final response = await idGen.generateNanoID(size: 20);
      print('[IDGen] Generated nanoID with size 20: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 20);
    });

    // Ensure it generates a nanoID with a custom alphabet
    test('Generate nanoID with custom alphabet', () async {
      final response =
          await idGen.generateNanoID(alphabet: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');

      print('[IDGen] Generated nanoID with custom alphabet: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 10);
    });

    // All together now
    test('Generate nanoID with custom size and alphabet', () async {
      final response = await idGen.generateNanoID(
          size: 20, alphabet: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789');
      print(
          '[IDGen] Generated nanoID with size 20 and custom alphabet: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 20);
    });

    // Ensure it throws an error when generating a nanoID with an empty alphabet
    test('Generate nanoID with empty alphabet', () async {
      try {
        await idGen.generateNanoID(alphabet: '');
        fail('Should have thrown an exception');
      } on ArgumentError catch (e) {
        expect(e.message, 'Cannot generate a nanoID with an empty alphabet');
      } catch (e) {
        fail('Should have thrown an ArgumentError');
      }
    });

    // Ensure it throws an error when generating a nanoID with an invalid alphabet length
    test('Generate nanoID with invalid alphabet length', () async {
      try {
        await idGen.generateNanoID(alphabet: 'AB');
        fail('Should have thrown an exception');
      } on ArgumentError catch (e) {
        expect(e.message,
            'Cannot generate a nanoID with an alphabet of length 2, must be between 3 and 256');
      } catch (e) {
        fail('Should have thrown an ArgumentError');
      }
    });

    // Ensure it throws an error when generating a nanoID with an invalid size
    test('Generate nanoID with invalid size', () async {
      try {
        await idGen.generateNanoID(size: 0);
        fail('Should have thrown an exception');
      } on ArgumentError catch (e) {
        expect(e.message,
            'Cannot generate a nanoID with a length of 0, must be between 1 and 256');
      } catch (e) {
        fail('Should have thrown an ArgumentError');
      }
    });

    // Ensure it generates a 2FA code pair
    test('Generate 2FA code pair', () async {
      final response = await idGen.generate2FACode();
      print('[IDGen] Generated 2FA code: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 6);
    });

    // Ensure it generates a 2FA code pair with a custom length
    test('Generate 2FA code pair with custom length', () async {
      final response = await idGen.generate2FACode(length: 10);
      print('[IDGen] Generated 2FA code with length 10: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 10);
    });

    // Ensure it throws an error when generating a 2FA code with an invalid length
    test('Generate 2FA code pair with invalid length', () async {
      try {
        await idGen.generate2FACode(length: 0);
        fail('Should have thrown an exception');
      } on ArgumentError catch (e) {
        expect(e.message,
            'Cannot generate a 2FA code with a length of 0, must be between 1 and 256');
      } catch (e) {
        fail('Should have thrown an ArgumentError');
      }
    });

    // Ensure it generates a license key
    test('Generate license key', () async {
      final response = await idGen.generateLicenseKey();
      print('[IDGen] Generated license key: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
      expect(response.id.length, 29);

      // Make sure it follows the 5-5-5-5-5 format
      final parts = response.id.split('-');
      expect(parts.length, 5);
    });

    // Ensure it generates a word based string
    test('Generate word based string', () async {
      final response = await idGen.generateWordBasedString();
      print('[IDGen] Generated word based string: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);
    });

    // Ensure it generates a word based string with a custom length
    test('Generate word based string with custom length', () async {
      final response = await idGen.generateWordBasedString(length: 10);
      print(
          '[IDGen] Generated word based string with length 10: ${response.id}');

      expect(response.id, isNotNull);
      expect(response.id, isNotEmpty);

      // Should contain -'s as the default separator
      expect(response.id.contains('-'), isTrue);
    });

    // Ensure it can generate all separators for word based strings
    test('Generate word based string with custom separator', () async {
      final responseSlug =
          await idGen.generateWordBasedString(separator: 'slug');
      print(
          '[IDGen] Generated word based string with slug separator: ${responseSlug.id}');

      final responseTitle =
          await idGen.generateWordBasedString(separator: 'title');
      print(
          '[IDGen] Generated word based string with title separator: ${responseTitle.id}');

      final responseFormal =
          await idGen.generateWordBasedString(separator: 'formal');
      print(
          '[IDGen] Generated word based string with formal separator: ${responseFormal.id}');

      expect(responseSlug.id, isNotNull);
      expect(responseSlug.id, isNotEmpty);

      expect(responseTitle.id, isNotNull);
      expect(responseTitle.id, isNotEmpty);

      expect(responseFormal.id, isNotNull);
      expect(responseFormal.id, isNotEmpty);
    });
  });

  // Ensure it errors when a invalid separator is used for word based strings
  test('Generate word based string with invalid separator', () async {
    final idGen = IDGen(username: username, token: token);
    try {
      await idGen.generateWordBasedString(separator: 'invalid');
      fail('Should have thrown an exception');
    } on ArgumentError catch (e) {
      expect(e.message,
          'Cannot generate a word based string with an invalid separator');
    } catch (e) {
      fail('Should have thrown an ArgumentError');
    }
  });

  // Ensure it errors when a invalid length is used for word based strings
  test('Generate word based string with invalid length', () async {
    final idGen = IDGen(username: username, token: token);
    try {
      await idGen.generateWordBasedString(length: 0);
      fail('Should have thrown an exception');
    } on ArgumentError catch (e) {
      expect(e.message,
          'Cannot generate a word based string with a length of 0, must be between 1 and 16');
    } catch (e) {
      fail('Should have thrown an ArgumentError');
    }
  });

  // Ensure it generates a snowflake ID
  test('Generate snowflake ID', () async {
    final idGen = IDGen(username: username, token: token);
    final response = await idGen.generateSnowflakeID();
    print('[IDGen] Generated snowflake ID: ${response.id}');

    expect(response.id, isNotNull);
    expect(response.id, isNotEmpty);
    expect(response.id.length, 20);
  });

  // Ensure it generates a keypair
  test('Generate keypair', () async {
    final idGen = IDGen(username: username, token: token);
    final response = await idGen.generateKeypair();
    print(
        '[IDGen] Generated keypair: ${response.id} and secret: ${response.privateID}');

    expect(response.id, isNotNull);
    expect(response.id, isNotEmpty);
    expect(response.privateID, isNotNull);
    expect(response.privateID, isNotEmpty);
  });
}