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


namespace AyaNova.Biz
{


    internal class DataListSavedColumnViewBiz : BizObject
    {

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

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



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


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        // 
        internal async Task<DataListSavedColumnView> CreateAsync(DataListSavedColumnView newObject)
        {
            ValidateAsync(newObject);
            if (HasErrors)
                return null;
            else
            {
                //delete the existing one in favor of this one
                if (!await DeleteAsync(newObject.UserId, newObject.ListKey))
                    return null;
                await ct.DataListSavedColumnView.AddAsync(newObject);
                await ct.SaveChangesAsync();

                return newObject;
            }
        }




        ////////////////////////////////////////////////////////////////////////////////////////////////
        //GET 
        //
        //Internal, used by datalistfetcher via datalisttableprocessingoptions constructor
        //can be called without full biz instantiation as it doesn't rely on UserId in biz object or other shit
        //maybe should be static?
        internal async Task<DataListSavedColumnView> GetAsync(long userId, string listKey, bool createDefaultIfNecessary)
        {
            var ret = await ct.DataListSavedColumnView.AsNoTracking().SingleOrDefaultAsync(z => z.UserId == userId && z.ListKey == listKey);
            if(ret==null && createDefaultIfNecessary){
                if(!DataListFactory.ListKeyIsValid(listKey)){
                    throw new System.ArgumentOutOfRangeException($"ListKey '{listKey}' is not a valid DataListKey");
                }
                ret=new DataListSavedColumnView();
                ret.UserId=UserId;
                ret.ListKey=listKey;
                var dataList=DataListFactory.GetAyaDataList(listKey);
                ret.Columns=JsonConvert.SerializeObject(dataList.DefaultColumns);
                ret.Sort=JsonConvert.SerializeObject(dataList.DefaultSortBy);
               return await CreateAsync(ret);
            }
            return ret;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(long userId, string listKey)
        {
            //this is effectively the RESET route handler
            //so it can be called any time even if there is no default list and it's a-ok
            //because a new default will be created if needed
            var dbObject = await GetAsync(userId, listKey, false);
            if (dbObject != null)
            {
                ct.DataListSavedColumnView.Remove(dbObject);
                await ct.SaveChangesAsync();
            }
            return true;
        }


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

        //Can save or update?
        private void ValidateAsync(DataListSavedColumnView inObj)
        {

            if (inObj.UserId != UserId)
                AddError(ApiErrorCode.NOT_AUTHORIZED, "UserId", "Only own view can be modified");

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

            if (!DataListFactory.ListKeyIsValid(inObj.ListKey))            
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "ListKey", $"ListKey \"{inObj.ListKey}\" DataListKey is not valid");
            
            
            //Validate Sort JSON
            try
            {
                JsonConvert.DeserializeObject<Dictionary<string, string>>(inObj.Sort);
            }
            catch (System.Exception ex)
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Sort", "Sort is not valid JSON string, can't convert to valid Dictionary<string, string> SortBy, error: " + ex.Message);
            }

            //Validate Columns JSON
            try
            {

                JsonConvert.DeserializeObject<List<string>>(inObj.Columns);
            }
            catch (System.Exception ex)
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Sort", "Sort is not valid JSON string, can't convert to valid Dictionary<string, string> SortBy, error: " + ex.Message);
            }

            return;
        }



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

    }//eoc


}//eons