private Dictionary UpdateVariables()

in tool/TeamCity.Docker/ConfigurationExplorer.cs [149:209]
56 lines of code
12 McCabe index (conditional complexity)

        private Dictionary<string, string> UpdateVariables([NotNull] IReadOnlyDictionary<string, string> variables, [NotNull] IReadOnlyDictionary<string, string> newVariables)
        {
            if (variables == null)
            {
                throw new ArgumentNullException(nameof(variables));
            }

            if (newVariables == null)
            {
                throw new ArgumentNullException(nameof(newVariables));
            }

            var result = new Dictionary<string, string>(variables);
            foreach (var (key, value) in newVariables)
            {
                if (result.ContainsKey(key))
                {
                    _logger.Details($"UPDATE {key}={value}");
                    result[key] = value;
                }
                else
                {
                    _logger.Details($"SET {key}={value}");
                    result.Add(key, value);
                }
            }

            var replacements = new Dictionary<string, string>();
            var iterations = 0;
            do
            {
                replacements.Clear();
                foreach (var (newKey, newValue) in result)
                {
                    foreach (var (key, value) in result)
                    {
                        var replacement = "${" + newKey + "}";
                        if (value.Contains(replacement))
                        {
                            replacements[key] = value.Replace(replacement, newValue);
                        }
                    }
                }

                foreach (var (key, value) in replacements)
                {
                    if (result.ContainsKey(key))
                    {
                        _logger.Details($"UPDATE {key}={value}");
                        result[key] = value;
                    }
                    else
                    {
                        _logger.Details($"SET {key}={value}");
                        result.Add(key, value);
                    }
                }
            } while (replacements.Count > 0 && iterations++ < 100);

            return result;
        }