using System.Collections.Generic;
using System.Linq;
using System.Text;
using AyaNova.Biz;
using Newtonsoft.Json.Linq;

namespace AyaNova.DataList
{

    /// <summary>
    /// DataList object base class
    /// </summary>
    internal abstract class AyaDataList : IAyaDataList
    {

        public AyaDataList()
        {

        }

        public string SQLFrom { get; set; }
        public List<AyaDataListFieldDefinition> FieldDefinitions { get; set; }//NOTE: First field after df is used as the title above the narrow grid view so it should be the name of the item to be shown that is most identifiable
        public AuthorizationRoles FullListAllowedRoles { get; set; }
        public AuthorizationRoles MiniListAllowedRoles { get; set; }
        public AyaType DefaultListObjectType { get; set; }
        public string ListKey { get; set; }
        public string DefaultDataListDisplayTemplate { get; set; }

        public Newtonsoft.Json.Linq.JArray GenerateMINIListColumnsJSON()
        {
            //return $"[ {{\"cm\":\"df\",\"dt\":0,\"ay\":{(int)DefaultListObjectType}}},{{\"cm\":\"Widget\",\"dt\":{(int)AyaUiFieldDataType.Text},\"ay\":{(int)DefaultListObjectType}}}]";
            return JArray.Parse($"[ {{\"cm\":\"df\",\"dt\":0,\"ay\":{(int)DefaultListObjectType}}},{{\"cm\":\"Widget\",\"dt\":{(int)UiFieldDataType.Text},\"ay\":{(int)DefaultListObjectType}}}]");
        }

        public Newtonsoft.Json.Linq.JArray GenerateListColumnsJSONFromTemplate(string template)
        {
            //parse the template
            var jtemplate = JObject.Parse(template);


            //convert to strings (https://stackoverflow.com/a/33836599/8939)
            var fullFields = ((JArray)jtemplate["full"]).ToObject<string[]>();

            //Generate JSON fragment to return with column definitions
            StringBuilder sb = new StringBuilder();

            sb.Append("[");
            //df First column is always the df column
            sb.Append($"{{\"cm\":\"df\",\"dt\":0,\"ay\":{(int)DefaultListObjectType}}}");

            foreach (string s in fullFields)
            {
                AyaDataListFieldDefinition o = FieldDefinitions.FirstOrDefault(x => x.FieldKey == s);
#if (DEBUG)
                //Developers little helper
                if (o == null)
                {
                    throw new System.ArgumentNullException($"DEV ERROR in AyaDataList::GenerateListColumnsJSONFromTemplate - field {s} specified in template was NOT found in ObjectFields list");
                }
#endif

                if (o != null)
                {//Here is where we can vet the field name, if it doesn't exist. For production we'll just ignore those ones

                    sb.Append(",");
                    sb.Append("{");
                    //Build required part of column definition
                    sb.Append($"\"cm\":\"{o.LtKey}\",\"dt\":{(int)o.UiFieldDataType}");

                    //Has a AyObjectType? (linkable / openable)
                    if (o.AyaObjectType != 0)
                        sb.Append($",\"ay\":{(int)o.AyaObjectType}");

                    //Has a Enumtype?
                    if (!string.IsNullOrEmpty(o.EnumType))
                        sb.Append($",\"et\":\"{TrimTypeName(o.EnumType)}\"");

                    sb.Append("}");

                }
            }
            sb.Append("]");

            return JArray.Parse(sb.ToString());
        }


        //used to trim an enum type down to only it's most relevant (rightmost) portion
        private string TrimTypeName(string str)
        {
            if (str.Contains('.'))
            {
                return str.Substring(str.LastIndexOf('.') + 1);
            }
            return str;
        }

        //make sure the template parses and all the fields specified are really existant
        //this is more for dev errors or api users becuase the client shouldn't generate bad templates
        public bool ValidateTemplate(string template)
        {
            try
            {
                //parse the template
                var jtemplate = JObject.Parse(template);
                var fullFields = ((JArray)jtemplate["full"]).ToObject<string[]>();
                var miniFields = ((JArray)jtemplate["mini"]).ToObject<string[]>();

                foreach (string s in fullFields)
                {
                    AyaDataListFieldDefinition o = FieldDefinitions.FirstOrDefault(x => x.FieldKey == s);
                    if (o == null)
                    {
                        return false;
                    }
                }

                foreach (string s in miniFields)
                {
                    AyaDataListFieldDefinition o = FieldDefinitions.FirstOrDefault(x => x.FieldKey == s);
                    if (o == null)
                    {
                        return false;
                    }
                }
            }
            catch
            {
                return false;
            }

            return true;
        }

    }//eoc

}//eons