public HelpInfo GetHelpInfo(HelpAdjacencyCriteria adjacencyCriteria)
{
Guard.AgainstNullArgument(nameof(adjacencyCriteria), adjacencyCriteria);
if (!File.Exists(_filePath))
{
throw new CategoryHelpFileNotFoundExeption();
}
var data = TryDeserialize(File.ReadAllText(_filePath));
var categories = data
.Where(kvp => IsSubjectOrOneLevelDeeper(kvp.Key))
.Select(kvp => new HelpInfo(
kvp.Key.IndexOf(' ') > -1
? kvp.Key.Substring(kvp.Key.IndexOf(' ') + 1)
: kvp.Key,
kvp.Key.Split(' ').FirstOrDefault(),
kvp.Value,
HelpInfoType.Category))
.ToList();
if (adjacencyCriteria.Equals(HelpAdjacencyCriteria.Empty()))
{
return(_defaultHelpInfo.WithChildren(categories));
}
if (categories.Any(h => h.Subject == adjacencyCriteria.Subject))
{
return(categories
.First(h => h.Name == adjacencyCriteria.Subject)
.WithChildren(categories.Where(h => h.Name != adjacencyCriteria.Subject)));
}
return(null);
Dictionary <string, string> TryDeserialize(string json)
{
try { return(JsonConvert.DeserializeObject <Dictionary <string, string> >(json)); }
catch { throw new CategoryHelpFileInvalidExeption(); }
}
bool IsSubjectOrOneLevelDeeper(string key)
{
var keySplit = key.Split(' ');
var adjacencySplit = adjacencyCriteria.Subject
.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (adjacencyCriteria.Subject == null && keySplit.Length == 1)
{
return(true);
}
return(key.StartsWith(adjacencyCriteria.Subject) &&
(keySplit.Length == adjacencySplit.Length || keySplit.Length == adjacencySplit.Length + 1));
}
}