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

namespace Sockeye.Biz
{
    internal class PurchaseBiz : BizObject, IJobObject, ISearchAbleObject, IReportAbleObject, IExportAbleObject, INotifiableObject
    {
        internal PurchaseBiz(AyContext dbcontext, long currentUserId, long userTranslationId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserTranslationId = userTranslationId;
            CurrentUserRoles = UserRoles;
            BizType = SockType.Purchase;
        }

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

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

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<Purchase> CreateAsync(Purchase newObject)
        {
            await ValidateAsync(newObject, null);
            if (HasErrors)
                return null;
            else
            {
                newObject.Tags = TagBiz.NormalizeTags(newObject.Tags);
                await ct.Purchase.AddAsync(newObject);
                await ct.SaveChangesAsync();
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, SockEvent.Created), ct);
                await SearchIndexAsync(newObject, true);
                await TagBiz.ProcessUpdateTagsInRepositoryAsync(ct, newObject.Tags, null);
                await HandlePotentialNotificationEvent(SockEvent.Created, newObject);
                return newObject;
            }
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //GET 
        //      
        internal async Task<Purchase> GetAsync(long id, bool logTheGetEvent = true)
        {
            var ret = await ct.Purchase.AsNoTracking().SingleOrDefaultAsync(z => z.Id == id);
            if (logTheGetEvent && ret != null)
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, id, BizType, SockEvent.Retrieved), ct);
            return ret;
        }

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

            putObject.Tags = TagBiz.NormalizeTags(putObject.Tags);
            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, putObject.Id, BizType, SockEvent.Modified), ct);
            await SearchIndexAsync(putObject, false);
            await TagBiz.ProcessUpdateTagsInRepositoryAsync(ct, putObject.Tags, dbObject.Tags);
            await HandlePotentialNotificationEvent(SockEvent.Modified, putObject, dbObject);
            return putObject;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(long id)
        {
            using (var transaction = await ct.Database.BeginTransactionAsync())
            {

                Purchase dbObject = await GetAsync(id, false);
                if (dbObject == null)
                {
                    AddError(ApiErrorCode.NOT_FOUND);
                    return false;
                }
                await ValidateCanDeleteAsync(dbObject);
                if (HasErrors)
                    return false;




                {
                    var IDList = await ct.Review.AsNoTracking().Where(x => x.SockType == SockType.Purchase && x.ObjectId == id).Select(x => x.Id).ToListAsync();
                    if (IDList.Count() > 0)
                    {
                        ReviewBiz b = new ReviewBiz(ct, UserId, UserTranslationId, CurrentUserRoles);
                        foreach (long ItemId in IDList)
                            if (!await b.DeleteAsync(ItemId, transaction))
                            {
                                AddError(ApiErrorCode.CHILD_OBJECT_ERROR, null, $"Review [{ItemId}]: {b.GetErrorsAsString()}");
                                return false;
                            }
                    }
                }

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

                //Log event 
                await EventLogProcessor.DeleteObjectLogAsync(UserId, BizType, dbObject.Id, dbObject.Name, ct);
                await Search.ProcessDeletedObjectKeywordsAsync(dbObject.Id, BizType, ct);
                await TagBiz.ProcessDeleteTagsInRepositoryAsync(ct, dbObject.Tags);
                await FileUtil.DeleteAttachmentsForObjectAsync(BizType, dbObject.Id, ct);
                await transaction.CommitAsync();
                await HandlePotentialNotificationEvent(SockEvent.Deleted, dbObject);

                return true;
            }
        }




        ////////////////////////////////////////////////////////////////////////////////////////////////
        //SEARCH
        //
        private async Task SearchIndexAsync(Purchase obj, bool isNew)
        {
            var SearchParams = new Search.SearchIndexProcessObjectParameters(UserTranslationId, obj.Id, BizType);
            DigestSearchText(obj, SearchParams);
            if (isNew)
                await Search.ProcessNewObjectKeywordsAsync(SearchParams);
            else
                await Search.ProcessUpdatedObjectKeywordsAsync(SearchParams);
        }

        public async Task<Search.SearchIndexProcessObjectParameters> GetSearchResultSummary(long id, SockType specificType)
        {
            var obj = await GetAsync(id, false);
            var SearchParams = new Search.SearchIndexProcessObjectParameters();
            DigestSearchText(obj, SearchParams);
            return SearchParams;
        }

        public void DigestSearchText(Purchase obj, Search.SearchIndexProcessObjectParameters searchParams)
        {
            if (obj != null)
                searchParams.AddText(obj.SalesOrderNumber)
                            .AddText(obj.CouponCode)
                            .AddText(obj.Wiki)
                            .AddText(obj.Tags)
                            .AddText(obj.Notes);
        }

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

        private async Task ValidateAsync(Purchase proposedObj, Purchase currentObj)
        {
           await Task.CompletedTask;

        }


        private async Task ValidateCanDeleteAsync(Purchase inObj)
        {

            await Task.CompletedTask;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //REPORTING
        //
        public async Task<JArray> GetReportData(DataListSelectedRequest dataListSelectedRequest, Guid jobId)
        {
            var idList = dataListSelectedRequest.SelectedRowIds;
            JArray ReportData = new JArray();
            while (idList.Any())
            {
                var batch = idList.Take(IReportAbleObject.REPORT_DATA_BATCH_SIZE);
                idList = idList.Skip(IReportAbleObject.REPORT_DATA_BATCH_SIZE).ToArray();

                //query for this batch, comes back in db natural order unfortunately
                var batchResults = await ct.Purchase.AsNoTracking().Where(z => batch.Contains(z.Id)).ToArrayAsync();

                //order the results back into original
                //What is happening here:
                //for performance the query is batching a bunch at once by fetching a block of items from the sql server
                //however it's returning in db order which is often not the order the id list is in
                //so it needs to be sorted back into the same order as the ide list
                //This would not be necessary if just fetching each one at a time individually (like in workorder get report data)

                var orderedList = from id in batch join z in batchResults on id equals z.Id select z;
                batchResults = null;

                foreach (Purchase w in orderedList)
                {
                    if (!ReportRenderManager.KeepGoing(jobId)) return null;
                    await PopulateVizFields(w);
                    var jo = JObject.FromObject(w);
                    if (!JsonUtil.JTokenIsNullOrEmpty(jo["CustomFields"]))
                        jo["CustomFields"] = JObject.Parse((string)jo["CustomFields"]);
                    ReportData.Add(jo);
                }
                orderedList = null;
            }
            vc.Clear();
            return ReportData;
        }
        private VizCache vc = new VizCache();


        //populate viz fields from provided object
        private async Task PopulateVizFields(Purchase o)
        {
            if (!vc.Has("customer", o.CustomerId))
            {
                vc.Add(await ct.Customer.AsNoTracking().Where(x => x.Id == o.CustomerId).Select(x => x.Name).FirstOrDefaultAsync(), "customer", o.CustomerId);
            }
            o.CustomerViz = vc.Get("customer", o.CustomerId);

            if (!vc.Has("vendor", o.VendorId))
            {
                vc.Add(await ct.Vendor.AsNoTracking().Where(x => x.Id == o.VendorId).Select(x => x.Name).FirstOrDefaultAsync(), "vendor", o.VendorId);
            }
            o.VendorViz = vc.Get("vendor", o.VendorId);


            if (!vc.Has("product", o.ProductId))
            {
                vc.Add(await ct.Product.AsNoTracking().Where(x => x.Id == o.ProductId).Select(x => x.Name).FirstOrDefaultAsync(), "product", o.ProductId);
            }
            o.ProductViz = vc.Get("product", o.ProductId);
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////       
        // IMPORT EXPORT
        //

        public async Task<JArray> GetExportData(DataListSelectedRequest dataListSelectedRequest, Guid jobId)
        {
            return await GetReportData(dataListSelectedRequest, jobId);
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //JOB / OPERATIONS
        //
        public async Task HandleJobAsync(OpsJob job)
        {
            //Hand off the particular job to the corresponding processing code
            //NOTE: If this code throws an exception the caller (JobsBiz::ProcessJobsAsync) will automatically set the job to failed and log the exeption so 
            //basically any error condition during job processing should throw up an exception if it can't be handled
            switch (job.JobType)
            {
                case JobType.BatchCoreObjectOperation:
                    await ProcessBatchJobAsync(job);
                    break;
                default:
                    throw new System.ArgumentOutOfRangeException($"PurchaseBiz.HandleJob-> Invalid job type{job.JobType.ToString()}");
            }
        }



        private async Task ProcessBatchJobAsync(OpsJob job)
        {
            await JobsBiz.UpdateJobStatusAsync(job.GId, JobStatus.Running);
            await JobsBiz.LogJobAsync(job.GId, $"LT:StartJob {job.SubType}");
            List<long> idList = new List<long>();
            long FailedObjectCount = 0;
            JObject jobData = JObject.Parse(job.JobInfo);
            if (jobData.ContainsKey("idList"))
                idList = ((JArray)jobData["idList"]).ToObject<List<long>>();
            else
                idList = await ct.Purchase.AsNoTracking().Select(z => z.Id).ToListAsync();
            bool SaveIt = false;

            //---------------------------------
            //case 4192
            TimeSpan ProgressAndCancelCheckSpan = new TimeSpan(0, 0, ServerBootConfig.JOB_PROGRESS_UPDATE_AND_CANCEL_CHECK_SECONDS);
            DateTime LastProgressCheck = DateTime.UtcNow.Subtract(new TimeSpan(1, 1, 1, 1, 1));
            var TotalRecords = idList.LongCount();
            long CurrentRecord = -1;
            //---------------------------------

            foreach (long id in idList)
            {
                try
                {
                    //--------------------------------
                    //case 4192
                    //Update progress / cancel requested?                    
                    CurrentRecord++;
                    if (DateUtil.IsAfterDuration(LastProgressCheck, ProgressAndCancelCheckSpan))
                    {
                        await JobsBiz.UpdateJobProgressAsync(job.GId, $"{CurrentRecord}/{TotalRecords}");
                        if (await JobsBiz.GetJobStatusAsync(job.GId) == JobStatus.CancelRequested)
                            break;
                        LastProgressCheck = DateTime.UtcNow;
                    }
                    //---------------------------------

                    SaveIt = false;
                    ClearErrors();
                    Purchase o = null;
                    //save a fetch if it's a delete
                    if (job.SubType != JobSubType.Delete)
                        o = await GetAsync(id, false);
                    switch (job.SubType)
                    {
                        case JobSubType.TagAddAny:
                        case JobSubType.TagAdd:
                        case JobSubType.TagRemoveAny:
                        case JobSubType.TagRemove:
                        case JobSubType.TagReplaceAny:
                        case JobSubType.TagReplace:
                            SaveIt = TagBiz.ProcessBatchTagOperation(o.Tags, (string)jobData["tag"], jobData.ContainsKey("toTag") ? (string)jobData["toTag"] : null, job.SubType);
                            break;
                        case JobSubType.Delete:
                            if (!await DeleteAsync(id))
                            {
                                await JobsBiz.LogJobAsync(job.GId, $"LT:Errors {GetErrorsAsString()} id {id}");
                                FailedObjectCount++;
                            }
                            break;
                        default:
                            throw new System.ArgumentOutOfRangeException($"ProcessBatchJobAsync -> Invalid job Subtype{job.SubType}");
                    }
                    if (SaveIt)
                    {
                        o = await PutAsync(o);
                        if (o == null)
                        {
                            await JobsBiz.LogJobAsync(job.GId, $"LT:Errors {GetErrorsAsString()} id {id}");
                            FailedObjectCount++;
                        }
                    }

                    //delay so we're not tying up all the resources in a tight loop
                    await Task.Delay(Sockeye.Util.ServerBootConfig.JOB_OBJECT_HANDLE_BATCH_JOB_LOOP_DELAY);
                }
                catch (Exception ex)
                {
                    await JobsBiz.LogJobAsync(job.GId, $"LT:Errors id({id})");
                    await JobsBiz.LogJobAsync(job.GId, ExceptionUtil.ExtractAllExceptionMessages(ex));
                }
            }

            //---------------------------------
            //case 4192
            await JobsBiz.UpdateJobProgressAsync(job.GId, $"{++CurrentRecord}/{TotalRecords}");
            //---------------------------------

            await JobsBiz.LogJobAsync(job.GId, $"LT:BatchJob {job.SubType} {idList.Count}{(FailedObjectCount > 0 ? " - LT:Failed " + FailedObjectCount : "")}");
            await JobsBiz.UpdateJobStatusAsync(job.GId, JobStatus.Completed);
        }






        ////////////////////////////////////////////////////////////////////////////////////////////////
        // NOTIFICATION PROCESSING
        //
        public async Task HandlePotentialNotificationEvent(SockEvent ayaEvent, ICoreBizObjectModel proposedObj, ICoreBizObjectModel currentObj = null)
        {
            if (ServerBootConfig.MIGRATING) return;
            ILogger log = Sockeye.Util.ApplicationLogging.CreateLogger<PurchaseBiz>();

            log.LogDebug($"HandlePotentialNotificationEvent processing:  [SockType:{this.BizType}, AyaEvent:{ayaEvent}]");

            bool isNew = currentObj == null;

            proposedObj.Name = "PURCHASE ID" + proposedObj.Id.ToString();
            //STANDARD EVENTS FOR ALL OBJECTS
            await NotifyEventHelper.ProcessStandardObjectEvents(ayaEvent, proposedObj, ct);

            //SPECIFIC EVENTS FOR THIS OBJECT
            Purchase o = (Purchase)proposedObj;

            //## DELETED EVENTS
            //any event added below needs to be removed, so
            //just blanket remove any event for this object of eventtype that would be added below here
            //do it regardless any time there's an update and then
            //let this code below handle the refreshing addition that could have changes           
            //await NotifyEventHelper.ClearPriorEventsForObject(ct, SockType.Purchase, o.Id, NotifyEventType.ContractExpiring);


            //## CREATED / MODIFIED EVENTS
            if (ayaEvent == SockEvent.Created || ayaEvent == SockEvent.Modified)
            {

                //# NEW PURCHASE VENDOR NOTIFICATION
                if (ayaEvent == SockEvent.Created)
                {
                    //Get product name and get customer name to notify
                    var productName = await ct.Product.AsNoTracking().Where(x => x.Id == o.ProductId).Select(x => x.Name).FirstOrDefaultAsync();
                    var customerName = await ct.Customer.AsNoTracking().Where(x => x.Id == o.CustomerId).Select(x => x.Name).FirstOrDefaultAsync();
                    {
                        //Newly created only and immediate delivery so no need to remove
                        var subs = await ct.NotifySubscription.AsNoTracking().Where(z => z.EventType == NotifyEventType.PurchaseNotificationReceived).ToListAsync();
                        foreach (var sub in subs)
                        {
                            //not for inactive users
                            if (!await UserBiz.UserIsActive(sub.UserId)) continue;

                            NotifyEvent n = new NotifyEvent()
                            {
                                EventType = NotifyEventType.PurchaseNotificationReceived,
                                UserId = sub.UserId,
                                SockType = BizType,
                                ObjectId = o.Id,
                                NotifySubscriptionId = sub.Id,
                                Name = $"Purchase - {customerName}, {productName} x {o.Quantity} "
                            };
                            await ct.NotifyEvent.AddAsync(n);
                            log.LogDebug($"Adding NotifyEvent:  [{n.ToString()}]");
                            await ct.SaveChangesAsync();
                        }
                    }
                }//new purchase notification event

            }

        }//end of process notifications


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

    }//eoc


}//eons