namespace ASC.Notify.Patterns;

public class XmlPatternProvider2 : IPatternProvider
{
    private readonly IDictionary<string, IPattern> _patterns = new Dictionary<string, IPattern>();
    private readonly IPatternFormatter _formatter = null;

    public Func<INotifyAction, string, NotifyRequest, IPattern> GetPatternMethod { get; set; }


    public XmlPatternProvider2(string xml)
        : this(xml, null)
    {
    }

    public XmlPatternProvider2(string xml, Func<INotifyAction, string, NotifyRequest, IPattern> getpattern)
    {
        GetPatternMethod = getpattern;

        var xdoc = new XmlDocument();
        xdoc.LoadXml(xml);

        if (xdoc.SelectSingleNode("/patterns/formatter") is XmlElement xformatter)
        {
            var type = xformatter.GetAttribute("type");
            if (!string.IsNullOrEmpty(type))
            {
                _formatter = (IPatternFormatter)Activator.CreateInstance(Type.GetType(type, true));
            }
        }

        var references = new Dictionary<string, string>();

        foreach (XmlElement xpattern in xdoc.SelectNodes("/patterns/pattern"))
        {
            var id = xpattern.GetAttribute("id");
            var sender = xpattern.GetAttribute("sender");
            var reference = xpattern.GetAttribute("reference");

            if (string.IsNullOrEmpty(reference))
            {
                var subject = GetResource(GetElementByTagName(xpattern, "subject"));

                var xbody = GetElementByTagName(xpattern, "body");
                var body = GetResource(xbody);
                if (string.IsNullOrEmpty(body) && xbody != null && xbody.FirstChild is XmlText)
                {
                    body = xbody.FirstChild.Value ?? string.Empty;
                }

                var styler = xbody != null ? xbody.GetAttribute("styler") : string.Empty;

                _patterns[id + sender] = new Pattern(id, subject, body, Pattern.HtmlContentType) { Styler = styler };
            }
            else
            {
                references[id + sender] = reference + sender;
            }
        }

        foreach (var pair in references)
        {
            _patterns[pair.Key] = _patterns[pair.Value];
        }
    }

    public IPattern GetPattern(INotifyAction action, string senderName)
    {
        if (_patterns.TryGetValue(action.ID + senderName, out var p))
        {
            return p;
        }
        if (_patterns.TryGetValue(action.ID, out p))
        {
            return p;
        }

        return null;
    }

    public IPatternFormatter GetFormatter(IPattern pattern)
    {
        return _formatter;
    }


    private XmlElement GetElementByTagName(XmlElement e, string name)
    {
        var list = e.GetElementsByTagName(name);

        return list.Count == 0 ? null : list[0] as XmlElement;
    }

    private string GetResource(XmlElement e)
    {
        var result = string.Empty;

        if (e == null)
        {
            return result;
        }

        result = e.GetAttribute("resource");
        if (string.IsNullOrEmpty(result))
        {
            return result;
        }

        var array = result.Split(new[] { "|" }, StringSplitOptions.RemoveEmptyEntries);
        if (array.Length < 2)
        {
            return result;
        }

        var resourceManagerType = Type.GetType(array[1], true, true);
        var property = resourceManagerType.GetProperty(array[0], BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static) ??
                       resourceManagerType.GetProperty(ToUpper(array[0]), BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);

        if (property == null)
        {
            throw new NotifyException($"Resource {array[0]} not found in resourceManager {array[1]}");
        }

        return property.GetValue(resourceManagerType, null) as string;

        static string ToUpper(string name)
        {
            return name[0].ToString().ToUpper() + name.Substring(1);
        }
    }
}