generator.dart

import 'dart:io';

void main() async {
  const alphabet = 'ABCDEFGHJKLMNPQRSTUVWXYZ';
  const length = alphabet.length;

  generateTuples(alphabet, length);
  generateFutures(alphabet, length);
  generateTests(alphabet, length);
}

void generateTests(String alphabet, int length) {
  File tests = File('test/type_saving_wait_test.dart');
  String result = 'import \'package:flutter_test/flutter_test.dart\';\n';
  final results = [
    [3.14, 'double'],
    [15, 'int'],
    [-1, 'int'],
    ['TestObject()', 'TestObject']
  ];

  result += 'import \'package:type_saving_wait/type_saving_wait.dart\';\n\n';
  result += 'class TestObject {}\n\n';
  result += 'void main() {\n\n';

  for (var i = 2; i <= length; i++) {
    final letters = alphabet.substring(0, i);
    final splitted = letters.split('');
    final itterTypes = [];

    result +=
        'test(\'FutureSaving.wait$i should save values and values types\', () async {\n';
    result += '\$0';

    for (var element in splitted) {
      final itterResult = (results..shuffle()).first[0];
      itterTypes.add(results.first[1]);

      result = result.replaceAll(
          '\$0', 'final ${element.toLowerCase()}Value = $itterResult;');

      result += '\n\$0';
    }

    result = result.replaceAll('\n\$0', '\n\n');

    result += '\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0',
          'final ${element.toLowerCase()} = Future.value(${element.toLowerCase()}Value);');

      result += '\n\$0';
    }

    result = result.replaceAll('\n\$0', '\n\n');

    result += 'final result = await FutureSaving.wait$i(\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0', '${element.toLowerCase()}');

      result += ', \$0';
    }

    result = result.replaceAll(', \$0', ',);\n\n');

    result += '\$0';

    int j = 0;
    for (var element in splitted) {
      final type = itterTypes[j++];
      result = result.replaceAll('\$0',
          '$type ${element.toLowerCase()}Result = result.${element.toLowerCase()};');

      result += '\n\$0';
    }

    result = result.replaceAll('\n\$0', '\n\n');

    result += '\$0';

    for (var element in splitted) {
      final lower = element.toLowerCase();
      result =
          result.replaceAll('\$0', 'expect(${lower}Result, ${lower}Value);');

      result += '\n\$0';
    }

    result = result.replaceAll('\n\$0', '\n});\n');
  }

  result += '}';
  tests.writeAsStringSync(result);
}

void generateFutures(String alphabet, int length) {
  File futures = File('lib/type_saving_wait.dart');
  String result = 'library type_saving_wait;\n\n';
  result += 'import \'package:type_saving_wait/tuples.dart\';\n\n';
  result +=
      '/// Currently is not possible to create static function in Extension\n';
  result +=
      '/// so now we need to use FutureSaving.wait, instead of Future.wait\n';
  result += 'extension FutureSaving on Future {\n\n';

  for (var i = 2; i <= length; i++) {
    final letters = alphabet.substring(0, i);
    final splitted = letters.split('');

    result += '/// Function for save $i arguments types\n';

    result += '\$0';
    var k = 0;
    for (var element in splitted) {
      result = result.replaceAll('\$0',
          '/// [${element.toLowerCase()}] is ${k++} element of container');

      result += '\n\$0';
    }

    result = result.replaceAll('\n\$0', '\n');

    result += 'static Future<FutureResult$i<\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0', element);

      result += ', \$0';
    }

    result = result.replaceAll(', \$0', '>>');

    result += ' wait$i<\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0', element);

      result += ', \$0';
    }

    result = result.replaceAll(', \$0', '>');

    result += '(\$0';

    for (var element in splitted) {
      result =
          result.replaceAll('\$0', 'Future<$element> ${element.toLowerCase()}');

      result += ', \$0';
    }

    result = result.replaceAll(', \$0', ',) {\n');

    result += 'return Future.wait([\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0', element.toLowerCase());

      result += ', \$0';
    }

    result = result.replaceAll(', \$0', ',],)\n');

    result += '.then((value) => FutureResult$i(\$0';
    var j = 0;
    for (var element in splitted) {
      result = result.replaceAll('\$0', 'value[${j++}] as $element');
      result += ', \$0';
    }

    result = result.replaceAll(', \$0', ',),);\n');
    result += '}\n';
  }
  result += '}';
  futures.writeAsStringSync(result);
}

void generateTuples(String alphabet, int length) {
  File tuples = File('lib/tuples.dart'); //load the json file
  tuples.writeAsStringSync('');

  for (var i = 2; i <= length; i++) {
    final letters = alphabet.substring(0, i);
    final splitted = letters.split('');
    String result =
        '/// Class for handle $i arguments inside\nclass FutureResult$i<\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0', element);

      result += ', \$0';
    }

    result = result.replaceAll(', \$0', '> { \n\$0');
    var j = 1;
    for (var element in splitted) {
      result = result.replaceAll('\$0',
          '/// [${element.toLowerCase()}] is ${j++} element of container \nfinal $element ${element.toLowerCase()};\n');

      result += '\$0';
    }

    result = result.replaceAll('\$0', '\n');

    result += 'FutureResult$i(\$0';

    for (var element in splitted) {
      result = result.replaceAll('\$0', 'this.${element.toLowerCase()}, ');

      result += '\$0';
    }

    result = result.replaceAll(', \$0', ',);\n}\n');

    tuples.writeAsStringSync(result, mode: FileMode.append);
  }
}