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

namespace AyaNova.Biz
{


    internal class TaskGroupBiz : BizObject, IJobObject, ISearchAbleObject, IReportAbleObject, IExportAbleObject, IImportAbleObject
    {
        internal TaskGroupBiz(AyContext dbcontext, long currentUserId, long userTranslationId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserTranslationId = userTranslationId;
            CurrentUserRoles = UserRoles;
            BizType = AyaType.TaskGroup;
        }

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

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

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<TaskGroup> CreateAsync(TaskGroup newObject)
        {

            await ValidateAsync(newObject, null);
            if (HasErrors)
                return null;
            else
            {
                await ct.TaskGroup.AddAsync(newObject);
                await ct.SaveChangesAsync();
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, AyaEvent.Created), ct);
                await SearchIndexAsync(newObject, true);

                return newObject;
            }
        }


        // ////////////////////////////////////////////////////////////////////////////////////////////////
        // //DUPLICATE
        // //
        // internal async Task<TaskGroup> DuplicateAsync(long id)
        // {
        //     TaskGroup dbObject = await GetAsync(id, false);
        //     if (dbObject == null)
        //     {
        //         AddError(ApiErrorCode.NOT_FOUND, "id");
        //         return null;
        //     }
        //     TaskGroup newObject = new TaskGroup();
        //     CopyObject.Copy(dbObject, newObject, "Wiki,Id");
        //     string newUniqueName = string.Empty;
        //     bool NotUnique = true;
        //     long l = 1;
        //     do
        //     {
        //         newUniqueName = Util.StringUtil.UniqueNameBuilder(dbObject.Name, l++, 255);
        //         NotUnique = await ct.TaskGroup.AnyAsync(m => m.Name == newUniqueName);
        //     } while (NotUnique);
        //     newObject.Name = newUniqueName;
        //     newObject.Id = 0;
        //     newObject.Concurrency = 0;
        //     foreach (TaskGroupItem pai in newObject.Items)
        //     {
        //         pai.Id = 0;
        //         pai.Concurrency = 0;
        //     }
        //     await ct.TaskGroup.AddAsync(newObject);
        //     await ct.SaveChangesAsync();
        //     await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, AyaEvent.Created), ct);
        //     await SearchIndexAsync(newObject, true);

        //     return newObject;
        // }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //GET 
        //      
        internal async Task<TaskGroup> GetAsync(long id, bool logTheGetEvent = true)
        {
            var ret = await ct.TaskGroup.AsNoTracking().Include(z => z.Items.OrderBy(item => item.Sequence)).SingleOrDefaultAsync(m => m.Id == id);
            if (logTheGetEvent && ret != null)
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, id, BizType, AyaEvent.Retrieved), ct);

            return ret;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE
        //
        internal async Task<TaskGroup> PutAsync(TaskGroup putObject)
        {
            //Get the db object with no tracking as about to be replaced not updated     
            TaskGroup 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;
            }


            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, AyaEvent.Modified), ct);
            await SearchIndexAsync(putObject, false);

            return putObject;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(long id)
        {
            using (var transaction = await ct.Database.BeginTransactionAsync())
            {
                TaskGroup dbObject = await GetAsync(id, false);
                if (dbObject == null)
                {
                    AddError(ApiErrorCode.NOT_FOUND);
                    return false;
                }
                ValidateCanDelete(dbObject);
                if (HasErrors)
                    return false;
                {
                    var IDList = await ct.Review.AsNoTracking().Where(x => x.AType == AyaType.TaskGroup && 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.TaskGroup.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 FileUtil.DeleteAttachmentsForObjectAsync(BizType, dbObject.Id, ct);
                await transaction.CommitAsync();
                return true;
            }
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //SEARCH
        //
        private async Task SearchIndexAsync(TaskGroup 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, AyaType specificType)
        {
            var obj = await GetAsync(id);
            var SearchParams = new Search.SearchIndexProcessObjectParameters();
            DigestSearchText(obj, SearchParams);
            return SearchParams;
        }

        public void DigestSearchText(TaskGroup obj, Search.SearchIndexProcessObjectParameters searchParams)
        {
            if (obj != null)
                searchParams.AddText(obj.Notes)
                            .AddText(obj.Name);
        }



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

        private async Task ValidateAsync(TaskGroup proposedObj, TaskGroup 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.TaskGroup.AnyAsync(m => m.Name == proposedObj.Name && m.Id != proposedObj.Id))
                {
                    AddError(ApiErrorCode.VALIDATION_NOT_UNIQUE, "Name");
                }
            }



            // //this would be caused by an API user not our UI so no need to translation
            // if (proposedObj.Items.GroupBy(z => z.PartId).Any(g => g.Count() > 1))
            // {
            //     ApiErrorCode.VALIDATION_NOT_UNIQUE
            //     AddError(ApiErrorCode.VALIDATION_FAILED, "generalerror", "Duplicate parts are not allowed in the items collection");
            //     return;
            // }



            //Any form customizations to validate?
            var FormCustomization = await ct.FormCustom.AsNoTracking().SingleOrDefaultAsync(x => x.FormKey == AyaType.TaskGroup.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);


            }

        }

        private void ValidateCanDelete(TaskGroup 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.TaskGroup.AsNoTracking().Include(z => z.Items).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 (TaskGroup w in orderedList)
                {
                    if (!ReportRenderManager.KeepGoing(jobId)) return null;
                    var jo = JObject.FromObject(w);
                    if (!JsonUtil.JTokenIsNullOrEmpty(jo["CustomFields"]))
                        jo["CustomFields"] = JObject.Parse((string)jo["CustomFields"]);
                    ReportData.Add(jo);
                }
                orderedList=null;
            }
            return ReportData;
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////       
        // 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 AyaNova.Util.JsonUtil.ShouldSerializeContractResolver(new string[] { "Concurrency", "Id", "CustomFields" }) });
            foreach (JObject j in importData.Data)
            {
                var w = j.ToObject<TaskGroup>(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($"TaskGroupBiz.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.TaskGroup.AsNoTracking().Select(z => z.Id).ToListAsync();
            bool SaveIt = false;
            foreach (long id in idList)
            {
                try
                {
                    SaveIt = false;
                    ClearErrors();
                    TaskGroup 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.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++;
                        }
                    }
                }
                catch (Exception ex)
                {
                    await JobsBiz.LogJobAsync(job.GId, $"LT:Errors id({id})");
                    await JobsBiz.LogJobAsync(job.GId, ExceptionUtil.ExtractAllExceptionMessages(ex));
                }
            }
            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(AyaEvent ayaEvent, ICoreBizObjectModel proposedObj, ICoreBizObjectModel currentObj = null)
        // {
        //     ILogger log = AyaNova.Util.ApplicationLogging.CreateLogger<TaskGroupBiz>();
        //     if(ServerBootConfig.SEEDING || ServerBootConfig.MIGRATING) return;
        //     log.LogDebug($"HandlePotentialNotificationEvent processing:  [AyaType:{this.BizType}, AyaEvent:{ayaEvent}]");

        //     bool isNew = currentObj == null;


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

        //     //SPECIFIC EVENTS FOR THIS OBJECT

        // }//end of process notifications




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

    }//eoc


}//eons