import 'package:teamhydra_idgen/src/idgen_http.dart';
import 'package:teamhydra_idgen/teamhydra_idgen.dart';

/// The main class to use when generating an ID
///
/// All returned IDs are in the form of a [IDGenResponse] object which contains the ID.
/// If an error occurs, an [IDGenException] is thrown.
class IDGen {
  final String username;
  final String token;
  final IDGenHTTPWorker _worker;

  /// Create a new IDGen class to generate IDs
  ///
  /// [username] and [token] are required to authenticate with the IDGen API.
  IDGen({required this.username, required this.token})
      : _worker = IDGenHTTPWorker(username: username, token: token);

  /// Generate a new UUID V4
  ///
  /// Returns a [IDGenResponse] object containing the generated ID.
  /// Throws an [IDGenException] if an error occurs.
  Future<IDGenResponse> generateUUIDV4() async {
    return await _worker.generate('uuid', null);
  }

  /// Generate a new nanoID
  ///
  /// Returns a [IDGenResponse] object containing the generated ID.
  /// Optionally, you can pass a [size] parameter to specify the length of the nanoID, default is 10.
  /// You can also pass a [alphabet] parameter to specify the characters used in the nanoID, default is provided by the API.
  ///
  /// Throws an [IDGenException] if an error occurs.
  ///
  /// Throws an [ArgumentError] if the size is not between 1 and 256 or the alphabet is empty.
  Future<IDGenResponse> generateNanoID({int? size, String? alphabet}) async {
    // Ensure length is between 1 and 256 (if specified)
    if (size != null && (size < 1 || size > 256)) {
      throw ArgumentError(
          'Cannot generate a nanoID with a length of $size, must be between 1 and 256');
    }

    // Ensure alphabet is not empty (if specified)
    if (alphabet != null && alphabet.isEmpty) {
      throw ArgumentError('Cannot generate a nanoID with an empty alphabet');
    }

    // Ensure alphabet is at least 3 characters long and not longer than 256
    if (alphabet != null && (alphabet.length < 3 || alphabet.length > 256)) {
      throw ArgumentError(
          'Cannot generate a nanoID with an alphabet of length ${alphabet.length}, must be between 3 and 256');
    }

    return await _worker.generate('nanoid', {
      if (size != null) 'length': size else 'length': 10,
      if (alphabet != null) 'alphabet': alphabet,
    });
  }

  /// Generate a 2FA code pair
  ///
  /// Returns a [IDGenResponse] object containing the generated ID.
  ///
  /// Optionally, you can pass a [length] parameter to specify the length of the 2FA code, default is 6.
  ///
  /// Throws an [IDGenException] if an error occurs.
  ///
  /// Throws an [ArgumentError] if the length is not between 1 and 256.
  Future<IDGenResponse> generate2FACode({int? length}) async {
    // Ensure length is between 1 and 256 (if specified)
    if (length != null && (length < 1 || length > 256)) {
      throw ArgumentError(
          'Cannot generate a 2FA code with a length of $length, must be between 1 and 256');
    }

    return await _worker.generate('2fa', {
      if (length != null) 'length': length,
    });
  }

  /// Generate a license key
  ///
  /// Returns a [IDGenResponse] object containing the generated ID.
  /// Keys are generated with a 25 character length, resulting in a 5-5-5-5-5 format.
  ///
  /// Throws an [IDGenException] if an error occurs.
  Future<IDGenResponse> generateLicenseKey() async {
    return await _worker.generate('license', null);
  }

  /// Generate word based string
  ///
  /// Returns a [IDGenResponse] object containing the generated ID.
  /// Optionally, you can pass a [length] parameter to specify the length of the word based string, default is 5.
  /// You can also pass a [separator] parameter to specify the separator used in the word based string, options are 'slug', 'title' and 'formal'. Default is 'slug'.
  ///
  /// Slug: lowercase words separated by hyphens
  ///
  /// Title: Title case words separated by spaces
  ///
  /// Formal: Title case words with no spaces or separators
  ///
  /// Throws an [IDGenException] if an error occurs.
  ///
  /// Throws an [ArgumentError] if the length is not between 1 and 16 or the separator is invalid.
  Future<IDGenResponse> generateWordBasedString(
      {int? length, String? separator}) async {
    // Ensure length is between 1 and 256 (if specified)
    if (length != null && (length < 1 || length > 16)) {
      throw ArgumentError(
          'Cannot generate a word based string with a length of $length, must be between 1 and 16');
    }

    // Ensure separator is valid (if specified)
    if (separator != null &&
        separator != 'slug' &&
        separator != 'title' &&
        separator != 'formal') {
      throw ArgumentError(
          'Cannot generate a word based string with an invalid separator');
    }

    return await _worker.generate('word', {
      if (length != null) 'length': length else 'length': 5,
      if (separator != null) 'style': separator else 'style': 'slug',
    });
  }

  /// Generate a snowflake ID
  ///
  /// Returns a [IDKeypairResponse] object containing
  ///
  /// Throws an [IDGenException] if an error occurs.
  Future<IDGenResponse> generateSnowflakeID() async {
    return await _worker.generate('snowflake', null);
  }

  /// Generate a keypair
  ///
  /// Returns a [IDKeypairResponse] object containing the generated ID and secret key.
  /// Throws an [IDGenException] if an error occurs.
  Future<IDKeypairResponse> generateKeypair() async {
    return await _worker.generateKeypair();
  }
}