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

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

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

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

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<Reminder> CreateAsync(Reminder newObject)
        {
            await ValidateAsync(newObject, null);
            if (HasErrors)
                return null;
            else
            {
                newObject.Tags = TagBiz.NormalizeTags(newObject.Tags);
                newObject.CustomFields = JsonUtil.CompactJson(newObject.CustomFields);
                await ct.Reminder.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<Reminder> GetAsync(long id, bool logTheGetEvent = true)
        {
            var ret = await ct.Reminder.AsNoTracking().SingleOrDefaultAsync(m => m.Id == id);
            if (ret.UserId != UserId)
            {
                AddError(ApiErrorCode.NOT_AUTHORIZED, "generalerror", "A User may only retrieve their own reminders");
                return null;
            }
            if (logTheGetEvent && ret != null)
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, id, BizType, SockEvent.Retrieved), ct);
            return ret;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE
        //
        internal async Task<Reminder> PutAsync(Reminder 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);
            putObject.CustomFields = JsonUtil.CompactJson(putObject.CustomFields);
            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);
            await SearchIndexAsync(putObject, false);
            await TagBiz.ProcessUpdateTagsInRepositoryAsync(ct, putObject.Tags, dbObject.Tags);
            await HandlePotentialNotificationEvent(SockEvent.Modified, putObject, dbObject);
            return putObject;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE schedule only
        //       
        internal async Task<bool> PutNewScheduleTimeAsync(ScheduleItemAdjustParams p)
        {
            Reminder dbObject = await ct.Reminder.SingleOrDefaultAsync(z => z.Id == p.Id);
            if (dbObject == null)
            {
                AddError(ApiErrorCode.NOT_FOUND, "id");
                return false;
            }

            dbObject.StartDate = p.Start;
            dbObject.StopDate = p.End;

            await ValidateAsync(dbObject, dbObject);
            if (HasErrors) return false;
            try
            {
                await ct.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!await ExistsAsync(dbObject.Id))
                    AddError(ApiErrorCode.NOT_FOUND);
                else
                    AddError(ApiErrorCode.CONCURRENCY_CONFLICT);
                return false;
            }
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, dbObject.Id, dbObject.SType, SockEvent.Modified), ct);

            await HandlePotentialNotificationEvent(SockEvent.Modified, dbObject, dbObject);
            return true;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(long id)
        {
            using (var transaction = await ct.Database.BeginTransactionAsync())
            {
                Reminder dbObject = await ct.Reminder.SingleOrDefaultAsync(m => m.Id == id);
                if (dbObject == null)
                {
                    AddError(ApiErrorCode.NOT_FOUND);
                    return false;
                }
                ValidateCanDelete(dbObject);
                if (HasErrors)
                    return false;
                {
                    var IDList = await ct.Review.AsNoTracking().Where(x => x.SockType == SockType.Reminder && 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.Reminder.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(Reminder 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(Reminder obj, Search.SearchIndexProcessObjectParameters searchParams)
        {
            if (obj != null)
                searchParams.AddText(obj.Notes)
                            .AddText(obj.Name)
                            .AddText(obj.Wiki)
                            .AddText(obj.Tags)
                            .AddCustomFields(obj.CustomFields);
        }



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

        private async Task ValidateAsync(Reminder proposedObj, Reminder currentObj)
        {

            bool isNew = currentObj == null;

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

            //Hexadecimal notation: #RGB[A] R (red), G (green), B (blue), and A (alpha) are hexadecimal characters (0–9, A–F). A is optional. The three-digit notation (#RGB) is a shorter version of the six-digit form (#RRGGBB). For example, #f09 is the same color as #ff0099. Likewise, the four-digit RGB notation (#RGBA) is a shorter version of the eight-digit form (#RRGGBBAA). For example, #0f38 is the same color as #00ff3388.
            if (proposedObj.Color.Length > 12 || proposedObj.Color.Length < 4 || proposedObj.Color[0] != '#')
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "UiColor", "UiColor must be valid HEX color value");
            }



            //Any form customizations to validate?
            var FormCustomization = await ct.FormCustom.AsNoTracking().SingleOrDefaultAsync(x => x.FormKey == SockType.Reminder.ToString());
            if (FormCustomization != null)
            {
                //Yeppers, do the validation, there are two, the custom fields and the regular fields that might be set to required

                //validate users choices for required non custom fields
                RequiredFieldsValidator.Validate(this, FormCustomization, proposedObj);

                //validate custom fields
                CustomFieldsValidator.Validate(this, FormCustomization, proposedObj.CustomFields);
            }

        }

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


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //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.Reminder.AsNoTracking().Where(z => batch.Contains(z.Id)).ToArrayAsync();
                //order the results back into original
                var orderedList = from id in batch join z in batchResults on id equals z.Id select z;
                batchResults = null;
                foreach (Reminder 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(Reminder o)
        {
            if (!vc.Has("user", o.UserId))
                vc.Add(await ct.User.AsNoTracking().Where(x => x.Id == o.UserId).Select(x => x.Name).FirstOrDefaultAsync(), "user", o.UserId);
            o.UserViz = vc.Get("user", o.UserId);
        }

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

        public async Task<JArray> GetExportData(DataListSelectedRequest dataListSelectedRequest, Guid jobId)
        {
            //for now just re-use the report data code
            //this may turn out to be the pattern for most biz object types but keeping it seperate allows for custom usage from time to time
            return await GetReportData(dataListSelectedRequest, jobId);
        }

        public async Task<List<string>> ImportData(AyImportData importData)
        {
            List<string> ImportResult = new List<string>();
            string ImportTag = $"imported-{FileUtil.GetSafeDateFileName()}";

            var jsset = JsonSerializer.CreateDefault(new JsonSerializerSettings { ContractResolver = new Sockeye.Util.JsonUtil.ShouldSerializeContractResolver(new string[] { "Concurrency", "Id", "CustomFields" }) });
            foreach (JObject j in importData.Data)
            {
                var w = j.ToObject<Reminder>(jsset);
                if (j["CustomFields"] != null)
                    w.CustomFields = j["CustomFields"].ToString();
                w.Tags.Add(ImportTag);//so user can find them all and revert later if necessary
                var res = await CreateAsync(w);
                if (res == null)
                {
                    ImportResult.Add($"* {w.Name} - {this.GetErrorsAsString()}");
                    this.ClearErrors();
                }
                else
                {
                    ImportResult.Add($"{w.Name} - ok");
                }
            }
            return ImportResult;
        }




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

            bool isNew = currentObj == null;

            Reminder o = (Reminder)proposedObj;

            //STANDARD EVENTS FOR ALL OBJECTS
            await NotifyEventHelper.ProcessStandardObjectEvents(ayaEvent, proposedObj, ct);

            //SPECIFIC EVENTS FOR THIS OBJECT

            //## 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.Reminder, o.Id, NotifyEventType.ReminderImminent);

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

                    //notify users  (time delayed)
                    var subs = await ct.NotifySubscription.Where(z => z.EventType == NotifyEventType.ReminderImminent).ToListAsync();
                    foreach (var sub in subs)
                    {
                        //not for inactive users
                        if (!await UserBiz.UserIsActive(sub.UserId)) continue;

                        //Tag match? (will be true if no sub tags so always safe to call this)
                        if (NotifyEventHelper.ObjectHasAllSubscriptionTags(o.Tags, sub.Tags))
                        {

                            NotifyEvent n = new NotifyEvent()
                            {
                                EventType = NotifyEventType.ReminderImminent,
                                UserId = sub.UserId,
                                SockType = o.SType,
                                ObjectId = o.Id,
                                NotifySubscriptionId = sub.Id,
                                Name = o.Name,
                                EventDate = o.StartDate
                            };
                            await ct.NotifyEvent.AddAsync(n);
                            log.LogDebug($"Adding NotifyEvent:  [{n.ToString()}]");
                            await ct.SaveChangesAsync();
                        }
                    }

                }//Reminder imminent event

            }//end of process notifications
        }


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

    }//eoc


}//eons