using AyaNova.Models;
using System.Linq;
using Newtonsoft.Json.Linq;


namespace AyaNova.Biz
{
    internal static class CustomFieldsValidator
    {
        internal static void Validate(BizObject biz, FormCustom formCustom, string customFields)
        {
            bool hasCustomData = !string.IsNullOrWhiteSpace(customFields);

            //No form custom = no template to check against so nothing to do
            if (formCustom == null)
                return;


            //var OuterJson = JObject.Parse(formCustom.Template);
            var FormTemplate = JArray.Parse(formCustom.Template);
            //var FormTemplate = (JArray)OuterJson["template"];
            var ThisFormCustomFieldsList = FormAvailableFields.FormFields(formCustom.FormKey).Where(x => x.Custom == true).Select(x => x.Key).ToList();

            //If the customFields string is empty then only validation is if any of the fields are required to be filled in
            if (!hasCustomData)
            {
                //iterate the template
                for (int i = 0; i < FormTemplate.Count; i++)
                {
                    //get the field customization
                    var fldKey = FormTemplate[i]["fld"].Value<string>();
                    var fldRequired = FormTemplate[i]["required"].Value<bool>();
                    //Check if this is an expected custom field and that it was set to required
                    if (ThisFormCustomFieldsList.Contains(fldKey) && fldRequired == true)
                    {
                        //Ok, this field is required but custom fields are all empty so add this error
                        biz.AddError(ApiErrorCode.VALIDATION_CUSTOM_REQUIRED_EMPTY, fldKey);
                    }
                }

                return;
            }

            //here we have both a bunch of custom fields presumeably and a form customization so let's get cracking...
            //parse the custom fields, it should contain an object with 16 keys
            //NOTE: to save bandwidth the actual custom fields look like this:
            // - {c1:"blah",c2:"blah",c3:"blah".....c16:"blah"}
            //However the LT field names might be WidgetCustom1 or UserCustom16 so we need to translate by EndsWith
            var CustomFieldData = JObject.Parse(customFields);

            //make sure all the *required* keys are present
            foreach (string iFldKey in ThisFormCustomFieldsList)
            {

                //Translate the LT field key to the actual customFieldData field key
                var InternalCustomFieldName = FormAvailableFields.TranslateLTCustomFieldToInternalCustomFieldName(iFldKey);
                //Check if it's set to required
                var isRequired = CustomFieldIsSetToRequired(FormTemplate, iFldKey);

                //if it's not required then we don't care, jump to the next item...
                if (!isRequired)
                    continue;

                //It's required, make sure the key is present and contains data

                if (CustomFieldData.ContainsKey(InternalCustomFieldName))
                {
                    //validate for now that the custom fields set as required have data in them.  Note that we are not validating the sanity of the values, only that they exist
                    //trying to build in slack for when users inevitably change the TYPE of the custom field
                    //Maybe in future this will be handled more thoroughly here but for now just make sure it's been filled in

                    //validate it
                    string CurrentValue = CustomFieldData[InternalCustomFieldName].Value<string>();

                    if (string.IsNullOrWhiteSpace(CurrentValue))
                    {
                        biz.AddError(ApiErrorCode.VALIDATION_CUSTOM_REQUIRED_EMPTY, iFldKey);
                    }

                    // foreach (JObject jo in FormTemplate)
                    // {
                    //     if (jo["fld"].Value<string>() == iFldKey)
                    //     {
                    //         var fldRequired = jo["required"].Value<bool>();
                    //         if (fldRequired && string.IsNullOrWhiteSpace(CurrentValue))
                    //         {
                    //             biz.AddError(ApiErrorCode.VALIDATION_CUSTOM_REQUIRED_EMPTY, iFldKey);
                    //         }
                    //         break;
                    //     }
                    // }

                }
                else
                {
                    //This is a serious issue and invalidates all             
                    biz.AddError(ApiErrorCode.VALIDATION_MISSING_PROPERTY, iFldKey);
                }
            }

        }

        /// <summary>
        /// Check if field is required
        /// </summary>
        /// <param name="FormTemplate"></param>
        /// <param name="FieldKey"></param>
        /// <returns></returns>
        private static bool CustomFieldIsSetToRequired(JArray FormTemplate, string FieldKey)
        {
            foreach (JObject jo in FormTemplate)
            {
                if (jo["fld"].Value<string>() == FieldKey)
                {
                    return jo["required"].Value<bool>();
                }
            }
            return false;
        }

    }//eoc
}//ens