using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using AyaNova.Util;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Models;

namespace AyaNova.Biz
{

    //## This class manages personal form settings for users

    internal class FormUserOptionsBiz : BizObject
    {
        internal FormUserOptionsBiz(AyContext dbcontext, long currentUserId, long userTranslationId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserTranslationId = userTranslationId;
            CurrentUserRoles = UserRoles;
            BizType = AyaType.FormUserOptions;
        }

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

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

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<FormUserOptions> CreateAsync(FormUserOptions newObject)
        {
            Validate(newObject, null);
            if (HasErrors)
                return null;
            else
            {
                newObject.Options = JsonUtil.CompactJson(newObject.Options);
                await ct.FormUserOptions.AddAsync(newObject);
                await ct.SaveChangesAsync();
                return newObject;
            }
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //GET 
        //      
        internal async Task<FormUserOptions> GetAsync(string formKey)
        {
            var ret = await ct.FormUserOptions.AsNoTracking().SingleOrDefaultAsync(m => m.FormKey == formKey && m.UserId == UserId);
            return ret;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE
        //
        internal async Task<FormUserOptions> PutAsync(FormUserOptions putObject)
        {
            var dbObject = await GetAsync(putObject.FormKey);
            if (dbObject == null)
            {
                AddError(ApiErrorCode.NOT_FOUND, "formKey");
                return null;
            }
            if (dbObject.Concurrency != putObject.Concurrency)
            {
                AddError(ApiErrorCode.CONCURRENCY_CONFLICT);
                return null;
            }

            putObject.Options = JsonUtil.CompactJson(putObject.Options);
            Validate(putObject, dbObject);
            if (HasErrors) return null;
            ct.Replace(dbObject, putObject);
            try
            {
                await ct.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!await ExistsAsync(putObject.Id))
                    AddError(ApiErrorCode.NOT_FOUND);
                else
                    AddError(ApiErrorCode.CONCURRENCY_CONFLICT);
                return null;
            }

            return putObject;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(string formKey)
        {
            using (var transaction = await ct.Database.BeginTransactionAsync())
            {
                var dbObject = await GetAsync(formKey);
                if (dbObject == null)
                {
                    AddError(ApiErrorCode.NOT_FOUND);
                    return false;
                }
                ValidateCanDelete(dbObject);
                if (HasErrors)
                    return false;
                ct.FormUserOptions.Remove(dbObject);
                await ct.SaveChangesAsync();
                await transaction.CommitAsync();
                return true;
            }
        }



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

        private void Validate(FormUserOptions proposedObj, FormUserOptions currentObj)
        {
            if (proposedObj.UserId != UserId)
            {
                AddError(ApiErrorCode.NOT_AUTHORIZED, "generalerror", "A user can only modify their own personal form settings. UserId does not match current api user logged in.");
            }
        }

        private void ValidateCanDelete(FormUserOptions inObj)
        {
            if (inObj.UserId != UserId)
            {
                AddError(ApiErrorCode.NOT_AUTHORIZED, "generalerror", "A user can only modify their own personal form settings. UserId does not match current api user logged in.");
            }

        }


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

    }//eoc


}//eons