using System;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Sockeye.Util;
using Sockeye.Api.ControllerHelpers;
using Sockeye.Models;
using System.Linq;
using System.Collections.Generic;

namespace Sockeye.Biz
{
    internal class IntegrationBiz : BizObject
    {


        /*
        todo: needs code to back routes for logging and fetching log to view
        
        */
        internal IntegrationBiz(AyContext dbcontext, long currentUserId, long userTranslationId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserTranslationId = userTranslationId;
            CurrentUserRoles = UserRoles;
            BizType = SockType.Integration;
        }

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

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

        internal async Task<bool> ExistsByIntegrationAppIdAsync(Guid IntegrationAppId)
        {
            return await ct.Integration.AnyAsync(z => z.IntegrationAppId == IntegrationAppId);
        }


        ///////////////////////////////////////////////////////
        //APPID FROM dbID
        internal async Task<Guid> AppIdFromDbIdAsync(long id)
        {
            return await ct.Integration.AsNoTracking().Where(z => z.Id == id).Select(z => z.IntegrationAppId).SingleOrDefaultAsync();
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<Integration> CreateAsync(Integration newObject)
        {
            await ValidateAsync(newObject, null);
            if (HasErrors)
                return null;
            else
            {

                await ct.Integration.AddAsync(newObject);
                await ct.SaveChangesAsync();
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, SockEvent.Created), ct);
                return newObject;
            }
        }


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

        internal async Task<Integration> GetAsync(long id, bool logTheGetEvent = true)
        {
            return await GetAsync(await AppIdFromDbIdAsync(id), logTheGetEvent);
        }


        internal async Task<Integration> GetAsync(Guid IntegrationAppId, bool logTheGetEvent = true)
        {
            var ret = await ct.Integration.AsNoTracking().Include(z => z.Items).SingleOrDefaultAsync(m => m.IntegrationAppId == IntegrationAppId);
            if (logTheGetEvent && ret != null)
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, ret.Id, BizType, SockEvent.Retrieved), ct);

            return ret;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE
        //
        internal async Task<Integration> PutAsync(Integration putObject)
        {
            //Get the db object with no tracking as about to be replaced not updated     
            Integration dbObject = await GetAsync(putObject.IntegrationAppId, false);
            if (dbObject == null)
            {
                AddError(ApiErrorCode.NOT_FOUND, "IntegrationAppId");
                return null;
            }
            if (dbObject.Concurrency != putObject.Concurrency)
            {
                AddError(ApiErrorCode.CONCURRENCY_CONFLICT);
                return null;
            }


            await ValidateAsync(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;
            }
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, dbObject.Id, BizType, SockEvent.Modified), ct);


            return putObject;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //

        internal async Task<bool> DeleteAsync(long id)
        {
            return await DeleteAsync(await AppIdFromDbIdAsync(id));
        }

        internal async Task<bool> DeleteAsync(Guid IntegrationAppId)
        {
            using (var transaction = await ct.Database.BeginTransactionAsync())
            {
                Integration dbObject = await GetAsync(IntegrationAppId, false);
                if (dbObject == null)
                {
                    AddError(ApiErrorCode.NOT_FOUND);
                    return false;
                }
                ValidateCanDelete(dbObject);
                if (HasErrors)
                    return false;

                ct.Integration.Remove(dbObject);
                await ct.SaveChangesAsync();

                //Log event 
                await EventLogProcessor.DeleteObjectLogAsync(UserId, BizType, dbObject.Id, dbObject.Name, ct);
                await transaction.CommitAsync();

                return true;
            }
        }


        /////////////////////////////////////////////////////////////////////////////////
        //LOG to integration log
        //
        internal async Task<bool> LogAsync(NameIdItem logItem)
        {
            if (string.IsNullOrWhiteSpace(logItem.Name))
            {
                AddError(ApiErrorCode.NOT_FOUND, "name", "The log text message (name) is empty, nothing to log");
                return false;
            }
            if (!await ExistsAsync(logItem.Id))
            {
                AddError(ApiErrorCode.NOT_FOUND, "id", "The integration id specified was not found, remember this is the internal id (integer), not the application specific id (Guid)");
                return false;
            }

            await ct.IntegrationLog.AddAsync(new IntegrationLog { IntegrationId = logItem.Id, StatusText = logItem.Name });
            await ct.SaveChangesAsync();
            return true;
        }

        //GET LOG
        internal async Task<List<IntegrationLog>> GetLogAsync(long id)
        {
           return await ct.IntegrationLog.AsNoTracking().Where(z=>z.IntegrationId==id).OrderByDescending(z=>z.Created).ToListAsync();
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //VALIDATION
        //
        private async Task ValidateAsync(Integration proposedObj, Integration currentObj)
        {

            bool isNew = currentObj == null;

            //Name required
            if (string.IsNullOrWhiteSpace(proposedObj.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.Integration.AnyAsync(m => m.Name == proposedObj.Name && m.Id != proposedObj.Id))
                {
                    AddError(ApiErrorCode.VALIDATION_NOT_UNIQUE, "Name");
                }
            }

            //Name required
            if (proposedObj.IntegrationAppId == Guid.Empty)
                AddError(ApiErrorCode.VALIDATION_REQUIRED, "IntegrationAppId");

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

        }

        private void ValidateCanDelete(Integration inObj)
        {
            //whatever needs to be check to delete this object
        }




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

    }//eoc


}//eons