using System.Linq;
using System.Threading.Tasks;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using AyaNova.Util;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Models;
using AyaNova.DataList;


namespace AyaNova.Biz
{


    internal class DataListSavedFilterBiz : BizObject
    {

        internal DataListSavedFilterBiz(AyContext dbcontext, long currentUserId, long userTranslationId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserTranslationId = userTranslationId;
            CurrentUserRoles = UserRoles;
            BizType = AyaType.DataListSavedFilter;
        }

        internal static DataListSavedFilterBiz GetBiz(AyContext ct, Microsoft.AspNetCore.Http.HttpContext httpContext = null)
        {
            if (httpContext != null)
                return new DataListSavedFilterBiz(ct, UserIdFromContext.Id(httpContext.Items), UserTranslationIdFromContext.Id(httpContext.Items), UserRolesFromContext.Roles(httpContext.Items));
            else
                return new DataListSavedFilterBiz(ct, 1, ServerBootConfig.AYANOVA_DEFAULT_TRANSLATION_ID, AuthorizationRoles.BizAdminFull);
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //EXISTS 
        internal async Task<bool> ExistsAsync(long id)
        {
            return await ct.DataListSavedFilter.AnyAsync(z => z.Id == id);
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE        
        internal async Task<DataListSavedFilter> CreateAsync(DataListSavedFilter inObj)
        {
            await ValidateAsync(inObj, true);
            if (HasErrors)
                return null;
            else
            {
                //do stuff with datafilter
                DataListSavedFilter outObj = inObj;
                outObj.UserId = UserId;


                await ct.DataListSavedFilter.AddAsync(outObj);
                await ct.SaveChangesAsync();

                //Handle child and associated items:

                //EVENT LOG
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), ct);



                return outObj;

            }
        }




        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DUPLICATE
        //

        internal async Task<DataListSavedFilter> DuplicateAsync(DataListSavedFilter dbObject)
        {

            DataListSavedFilter outObj = new DataListSavedFilter();
            CopyObject.Copy(dbObject, outObj);
            //generate unique name
            string newUniqueName = string.Empty;
            bool NotUnique = true;
            long l = 1;
            do
            {
                newUniqueName = Util.StringUtil.UniqueNameBuilder(dbObject.Name, l++, 255);
                NotUnique = await ct.DataListSavedFilter.AnyAsync(z => z.Name == newUniqueName);
            } while (NotUnique);
            outObj.Name = newUniqueName;
            outObj.Id = 0;
            outObj.Concurrency = 0;



            await ct.DataListSavedFilter.AddAsync(outObj);
            await ct.SaveChangesAsync();

            //Handle child and associated items:                
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), ct);

            return outObj;

        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        /// GET

        //Get one
        internal async Task<DataListSavedFilter> GetAsync(long fetchId, bool logTheGetEvent = true)
        {
            //This is simple so nothing more here, but often will be copying to a different output object or some other ops           
            var ret = await ct.DataListSavedFilter.SingleOrDefaultAsync(z => z.Id == fetchId && (z.Public == true || z.UserId == UserId));
            if (logTheGetEvent && ret != null)
            {
                //Log
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, fetchId, BizType, AyaEvent.Retrieved), ct);
            }
            return ret;
        }




        //get ViewList (NOT PAGED)
        internal async Task<List<NameIdItem>> GetViewListAsync(string listKey)
        {
            List<NameIdItem> items = new List<NameIdItem>();
            if (!string.IsNullOrWhiteSpace(listKey))
            {
                items = await ct.DataListSavedFilter
                                .AsNoTracking()
                                .Where(z => z.ListKey == listKey && (z.Public == true || z.UserId == UserId))
                                .OrderBy(z => z.Name)
                                 .Select(z => new NameIdItem()
                                 {
                                     Id = z.Id,
                                     Name = z.Name
                                 }).ToListAsync();

            }
            return items;
        }




        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE
        //

        //put
        internal async Task<bool> PutAsync(DataListSavedFilter dbObject, DataListSavedFilter inObj)
        {
            //preserve the owner ID if none was specified
            if (inObj.UserId == 0)
                inObj.UserId = dbObject.UserId;

            //Replace the db object with the PUT object
            CopyObject.Copy(inObj, dbObject, "Id");
            //Set "original" value of concurrency token to input token
            //this will allow EF to check it out
            ct.Entry(dbObject).OriginalValues["Concurrency"] = inObj.Concurrency;

            await ValidateAsync(dbObject, false);
            if (HasErrors)
                return false;
            await ct.SaveChangesAsync();

            //Log modification and save context
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, dbObject.Id, BizType, AyaEvent.Modified), ct);



            return true;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(DataListSavedFilter dbObject)
        {
            //Determine if the object can be deleted, do the deletion tentatively
            //Probably also in here deal with tags and associated search text etc

            //FUTURE POSSIBLE NEED
            //ValidateCanDelete(dbObject);

            if (HasErrors)
                return false;
            ct.DataListSavedFilter.Remove(dbObject);
            await ct.SaveChangesAsync();

            //Delete sibling objects

            //Event log process delete
            await EventLogProcessor.DeleteObjectLogAsync(UserId, BizType, dbObject.Id, dbObject.Name, ct);


            //Delete search index
            //Search.ProcessDeletedObjectKeywords(dbObject.Id, BizType);


            return true;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //VALIDATION
        //

        //Can save or update?
        private async Task ValidateAsync(DataListSavedFilter inObj, bool isNew)
        {

            //UserId required
            if (!isNew)
            {
                if (inObj.UserId == 0)
                    AddError(ApiErrorCode.VALIDATION_REQUIRED, "UserId");
            }



            //Name required
            if (string.IsNullOrWhiteSpace(inObj.Name))
                AddError(ApiErrorCode.VALIDATION_REQUIRED, "Name");


            //If name is otherwise OK, check that name is unique
            if (!PropertyHasErrors("Name"))
            {
                //Use Any command is efficient way to check existance, it doesn't return the record, just a true or false
                if (await ct.DataListSavedFilter.AnyAsync(z => z.Name == inObj.Name && z.Id != inObj.Id))
                {
                    AddError(ApiErrorCode.VALIDATION_NOT_UNIQUE, "Name");
                }
            }

            if (string.IsNullOrWhiteSpace(inObj.Filter))
                AddError(ApiErrorCode.VALIDATION_REQUIRED, "Filter");

            if (string.IsNullOrWhiteSpace(inObj.ListKey))
                AddError(ApiErrorCode.VALIDATION_REQUIRED, "ListKey");


            var DataList = DataListFactory.GetAyaDataList(inObj.ListKey);

            if (DataList == null)
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "ListKey", $"ListKey \"{inObj.ListKey}\" DataListKey is not valid");
            }

            if (inObj.ListKey.Length > 255)
                AddError(ApiErrorCode.VALIDATION_LENGTH_EXCEEDED, "ListKey", "255 max");

            //check if filter can be reconstructed into a C# filter object
            try
            {
                List<DataListFilterOption> dataListFilterOptions = JsonConvert.DeserializeObject<List<DataListFilterOption>>(inObj.Filter);
            }
            catch (System.Exception ex)
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Filter", "Filter is not valid JSON string, can't convert to List<DataListFilterOption>, error: " + ex.Message);
            }


            // //Filter json must parse
            // //this is all automated normally so not going to do too much parsing here
            // //just ensure it's basically there
            // if (!string.IsNullOrWhiteSpace(inObj.ListView))
            // {
            //     try
            //     {
            //         var v = JArray.Parse(inObj.ListView);
            //         for (int i = 0; i < v.Count; i++)
            //         {
            //             var filterItem = v[i];
            //             if (filterItem["fld"] == null)
            //                 AddError(ApiErrorCode.VALIDATION_REQUIRED, "ListView", $"ListView array item {i}, object is missing required \"fld\" property ");
            //             else
            //             {
            //                 var fld = filterItem["fld"].Value<string>();
            //                 if (string.IsNullOrWhiteSpace(fld))
            //                     AddError(ApiErrorCode.VALIDATION_REQUIRED, "ListView", $"ListView array item {i}, \"fld\" property is empty and required");

            //                 //validate the field name if we can
            //                 if (DataList != null)
            //                 {

            //                     var TheField = DataList.FieldDefinitions.SingleOrDefault(z => z.FieldKey.ToLowerInvariant() == fld.ToLowerInvariant());

            //                     if (TheField == null)
            //                     {
            //                         AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "ListView", $"ListView array item {i}, fld property value \"{fld}\" is not a valid value for ListKey specified");
            //                     }

            //                 }
            //             }


            //             //NOTE: value of nothing, null or empty is a valid value so no checking for it here
            //         }
            //     }
            //     catch (Newtonsoft.Json.JsonReaderException ex)
            //     {
            //         AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "ListView", "ListView is not valid JSON string: " + ex.Message);

            //     }
            // }



            return;
        }



        /////////////////////////////////////////////////////////////////////

    }//eoc


}//eons