using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.JsonPatch;
using EnumsNET;
using AyaNova.Util;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Biz;
using AyaNova.Models;
using System.Collections.Generic;

using Microsoft.Extensions.Logging;

namespace AyaNova.Biz
{

    internal class WidgetBiz : BizObject, IJobObject
    {

        internal WidgetBiz(AyContext dbcontext, long currentUserId, long userLocaleId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserLocaleId = userLocaleId;
            CurrentUserRoles = UserRoles;
            BizType = AyaType.Widget;
        }

        internal static WidgetBiz GetBiz(AyContext ct, Microsoft.AspNetCore.Http.HttpContext httpContext)
        {
            return new WidgetBiz(ct, UserIdFromContext.Id(httpContext.Items), UserLocaleIdFromContext.Id(httpContext.Items), UserRolesFromContext.Roles(httpContext.Items));
        }

        //Version for internal use
        internal static WidgetBiz GetBizInternal(AyContext ct)
        {
            return new WidgetBiz(ct, 1, ServerBootConfig.AYANOVA_DEFAULT_LANGUAGE_ID, AuthorizationRoles.BizAdminFull);
        }

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

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

        //Get without logging
        internal async Task<Widget> GetNoLogAsync(long fetchId)
        {
            //This is simple so nothing more here, but often will be copying to a different output object or some other ops
            return await ct.Widget.SingleOrDefaultAsync(m => m.Id == fetchId);
        }

        //Get one with logging
        internal async Task<Widget> GetAsync(long fetchId)
        {
            //This is simple so nothing more here, but often will be copying to a different output object or some other ops           
            var ret = await ct.Widget.SingleOrDefaultAsync(m => m.Id == fetchId);
            if (ret != null)
            {
                //Log
                EventLogProcessor.LogEventToDatabase(new Event(UserId, fetchId, BizType, AyaEvent.Retrieved), ct);
            }
            return ret;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   


        //route linked version for external api access
        internal async Task<Widget> CreateAsync(Widget inObj)
        {
            Validate(inObj, null);
            if (HasErrors)
                return null;
            else
            {
                //do stuff with widget
                Widget outObj = inObj;

                //Test get serial id visible id number from generator
                outObj.Serial = ServerBootConfig.WIDGET_SERIAL.GetNext();

                outObj.Tags = TagUtil.NormalizeTags(outObj.Tags);
                outObj.CustomFields = JsonUtil.CompactJson(outObj.CustomFields);

                await ct.Widget.AddAsync(outObj);
                await ct.SaveChangesAsync();

                //Handle child and associated items:                
                EventLogProcessor.LogEventToDatabase(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), ct);
                SearchIndex(outObj, true);
                TagUtil.ProcessUpdateTagsInRepository(ct, outObj.Tags, null);
                return outObj;
            }
        }


        //Internal version for seeding
        internal Widget Create(AyContext TempContext, Widget inObj)
        {
            Validate(inObj, null);
            if (HasErrors)
                return null;
            else
            {
                //do stuff with widget
                Widget outObj = inObj;

                //Test get serial id visible id number from generator
                outObj.Serial = ServerBootConfig.WIDGET_SERIAL.GetNext();
                outObj.Tags = TagUtil.NormalizeTags(outObj.Tags);
                outObj.CustomFields = JsonUtil.CompactJson(outObj.CustomFields);

                TempContext.Widget.Add(outObj);
                TempContext.SaveChanges();

                //Handle child and associated items:
                EventLogProcessor.LogEventToDatabase(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), TempContext);
                SearchIndex(outObj, true);
                TagUtil.ProcessUpdateTagsInRepository(TempContext, outObj.Tags, null);

                return outObj;
            }
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DUPLICATE
        //

        internal async Task<Widget> DuplicateAsync(Widget dbObj)
        {

            Widget outObj = new Widget();
            CopyObject.Copy(dbObj, outObj);
            outObj.Name = Util.StringUtil.NameUniquify(outObj.Name, 255);
            outObj.Id = 0;
            outObj.ConcurrencyToken = 0;

            //Test get serial id visible id number from generator
            outObj.Serial = ServerBootConfig.WIDGET_SERIAL.GetNext();

            await ct.Widget.AddAsync(outObj);
            await ct.SaveChangesAsync();

            //Handle child and associated items:                
            EventLogProcessor.LogEventToDatabase(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), ct);
            SearchIndex(outObj, true);
            TagUtil.ProcessUpdateTagsInRepository(ct, outObj.Tags, null);
            return outObj;

        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //UPDATE
        //

        //put
        internal bool Put(Widget dbObj, Widget inObj)
        {

            //make a snapshot of the original for validation but update the original to preserve workflow           
            Widget SnapshotOfOriginalDBObj = new Widget();
            CopyObject.Copy(dbObj, SnapshotOfOriginalDBObj);

            //Replace the db object with the PUT object
            CopyObject.Copy(inObj, dbObj, "Id,Serial");

            dbObj.Tags = TagUtil.NormalizeTags(dbObj.Tags);
            dbObj.CustomFields = JsonUtil.CompactJson(dbObj.CustomFields);

            //Set "original" value of concurrency token to input token
            //this will allow EF to check it out
            ct.Entry(dbObj).OriginalValues["ConcurrencyToken"] = inObj.ConcurrencyToken;


            Validate(dbObj, SnapshotOfOriginalDBObj);
            if (HasErrors)
                return false;

            //Associated items          
            EventLogProcessor.LogEventToDatabase(new Event(UserId, dbObj.Id, BizType, AyaEvent.Modified), ct);
            SearchIndex(dbObj, false);
            TagUtil.ProcessUpdateTagsInRepository(ct, dbObj.Tags, SnapshotOfOriginalDBObj.Tags);

            return true;
        }

        //patch
        internal bool Patch(Widget dbObj, JsonPatchDocument<Widget> objectPatch, uint concurrencyToken)
        {
            //Validate Patch is allowed
            //Note: Id and Serial are all checked for and disallowed in the validate code by default
            if (!ValidateJsonPatch<Widget>.Validate(this, objectPatch)) return false;

            //make a snapshot of the original for validation but update the original to preserve workflow           
            Widget SnapshotOfOriginalDBObj = new Widget();
            CopyObject.Copy(dbObj, SnapshotOfOriginalDBObj);

            //Do the patching
            objectPatch.ApplyTo(dbObj);

            dbObj.Tags = TagUtil.NormalizeTags(dbObj.Tags);
            dbObj.CustomFields = JsonUtil.CompactJson(dbObj.CustomFields);

            ct.Entry(dbObj).OriginalValues["ConcurrencyToken"] = concurrencyToken;
            Validate(dbObj, SnapshotOfOriginalDBObj);
            if (HasErrors)
                return false;

            //Associated items
            EventLogProcessor.LogEventToDatabase(new Event(UserId, dbObj.Id, BizType, AyaEvent.Modified), ct);
            SearchIndex(dbObj, false);

            TagUtil.ProcessUpdateTagsInRepository(ct, dbObj.Tags, SnapshotOfOriginalDBObj.Tags);

            return true;
        }


        private void SearchIndex(Widget obj, bool isNew)
        {
            //SEARCH INDEXING
            var SearchParams = new Search.SearchIndexProcessObjectParameters(UserLocaleId, obj.Id, BizType, obj.Name);
            SearchParams.AddText(obj.Notes).AddText(obj.Name).AddText(obj.Serial).AddText(obj.Tags).AddCustomFields(obj.CustomFields);


            if (isNew)
                Search.ProcessNewObjectKeywords(SearchParams);
            else
                Search.ProcessUpdatedObjectKeywords(SearchParams);
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal bool Delete(Widget dbObj)
        {
            //Determine if the object can be deleted, do the deletion tentatively
            //Probably also in here deal with tags and associated search text etc

            ValidateCanDelete(dbObj);
            if (HasErrors)
                return false;
            ct.Widget.Remove(dbObj);
            ct.SaveChanges();

            //Associated items
            EventLogProcessor.DeleteObject(UserId, BizType, dbObj.Id, dbObj.Name, ct);
            ct.SaveChanges();
            Search.ProcessDeletedObjectKeywords(dbObj.Id, BizType);
            TagUtil.ProcessDeleteTagsInRepository(ct, dbObj.Tags);
            return true;
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        // LISTS
        //

        public static FilterOptions FilterOptions(long localizeToLocaleId = 0)
        {
            //NOTE: All column names are lowercase to conform with Postgres AyaNova DB which uses lowercase for all identifiers
            //Also all list keys are lower case for consistency
            FilterOptions f = new FilterOptions("widget");
            f.
            AddField("id", "ID", AyDataType.Integer).
            AddField("name", "WidgetName", AyDataType.Text).
            AddField("serial", "WidgetSerial", AyDataType.Integer).
            AddField("notes", "WidgetNotes", AyDataType.Text).
            AddField("dollaramount", "WidgetDollarAmount", AyDataType.Decimal).
            AddField("active", "Active", AyDataType.Bool).
            AddField("startdate", "WidgetStartDate", AyDataType.Date).
            AddField("count", "WidgetCount", AyDataType.Integer).
            AddField("tags", "Tags", AyDataType.Tags).
            AddField("enddate", "WidgetEndDate", AyDataType.Date);

            if (localizeToLocaleId != 0)
                f.Localize(localizeToLocaleId);
            return f;
        }

        //get many (paged)
        internal async Task<ApiPagedResponse<Widget>> GetManyAsync(IUrlHelper Url, string routeName, PagingOptions pagingOptions)
        {
            pagingOptions.Offset = pagingOptions.Offset ?? PagingOptions.DefaultOffset;
            pagingOptions.Limit = pagingOptions.Limit ?? PagingOptions.DefaultLimit;

            //BUILD THE QUERY
            //base query
            var q = "SELECT *, xmin FROM AWIDGET ";

            //GET THE FILTER / SORT
            if (pagingOptions.DataFilterId > 0)
            {
                var TheFilter = await ct.DataFilter.FirstOrDefaultAsync(x => x.Id == pagingOptions.DataFilterId);

                //BUILD WHERE AND APPEND IT
                q = q + FilterSqlCriteriaBuilder.DataFilterToSQLCriteria(TheFilter, WidgetBiz.FilterOptions(), UserId);

                //BUILD ORDER BY AND APPEND IT
                q = q + FilterSqlOrderByBuilder.DataFilterToSQLOrderBy(TheFilter);
            }
            else
            {
                //GET DEFAULT ORDER BY
                q = q + FilterSqlOrderByBuilder.DefaultGetManyOrderBy();
            }


#pragma warning disable EF1000

            var items = await ct.Widget
                                        .FromSqlRaw(q)
                                        .AsNoTracking()
                                        .Skip(pagingOptions.Offset.Value)
                                        .Take(pagingOptions.Limit.Value)
                                        .ToArrayAsync();

            var totalRecordCount = await ct.Widget
                                                    .FromSqlRaw(q)
                                                    .AsNoTracking()
                                                    .CountAsync();
#pragma warning restore EF1000

            var pageLinks = new PaginationLinkBuilder(Url, routeName, null, pagingOptions, totalRecordCount).PagingLinksObject();

            ApiPagedResponse<Widget> pr = new ApiPagedResponse<Widget>(items, pageLinks);
            return pr;
        }


        /// <summary>
        /// Get PickList
        /// </summary>
        /// <param name="Url"></param>
        /// <param name="routeName"></param>
        /// <param name="pagingOptions"></param>
        /// <returns></returns>
        internal ApiPagedResponse<NameIdItem> GetPickList(IUrlHelper Url, string routeName, PagingOptions pagingOptions)
        {
            pagingOptions.Offset = pagingOptions.Offset ?? PagingOptions.DefaultOffset;
            pagingOptions.Limit = pagingOptions.Limit ?? PagingOptions.DefaultLimit;
            var ret = PickListFetcher.GetPickList(ct, UserId, pagingOptions, FilterOptions(), "awidget");
            var pageLinks = new PaginationLinkBuilder(Url, routeName, null, pagingOptions, ret.TotalRecordCount).PagingLinksObject();
            ApiPagedResponse<NameIdItem> pr = new ApiPagedResponse<NameIdItem>(ret.Items, pageLinks);
            return pr;
        }





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

        //Can save or update?
        private void Validate(Widget proposedObj, Widget currentObj)
        {
            //run validation and biz rules
            bool isNew = currentObj == null;

            // if (isNew)
            // {
            //     //WARNING: this is not really the "current" object, it's been modified already by caller

            //     // //NEW widgets must be active
            //     // if (inObj.Active == null || ((bool)inObj.Active) == false)
            //     // {
            //     //     AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Active", "New widget must be active");
            //     // }
            // }


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

            //Name must be less than 255 characters
            if (proposedObj.Name.Length > 255)
                AddError(ApiErrorCode.VALIDATION_LENGTH_EXCEEDED, "Name", "255 max");

            //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 (ct.Widget.Any(m => m.Name == proposedObj.Name && m.Id != proposedObj.Id))
                {
                    AddError(ApiErrorCode.VALIDATION_NOT_UNIQUE, "Name");
                }
            }

            //Start date AND end date must both be null or both contain values
            if (proposedObj.StartDate == null && proposedObj.EndDate != null)
                AddError(ApiErrorCode.VALIDATION_REQUIRED, "StartDate");

            if (proposedObj.StartDate != null && proposedObj.EndDate == null)
                AddError(ApiErrorCode.VALIDATION_REQUIRED, "EndDate");

            //Start date before end date
            if (proposedObj.StartDate != null && proposedObj.EndDate != null)
                if (proposedObj.StartDate > proposedObj.EndDate)
                    AddError(ApiErrorCode.VALIDATION_STARTDATE_AFTER_ENDDATE, "StartDate");

            //Enum is valid value

            if (!proposedObj.Roles.IsValid())
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Roles");
            }

            //Any form customizations to validate?
            var FormCustomization = ct.FormCustom.SingleOrDefault(x => x.FormKey == FormAvailableFields.WIDGET_FORM_KEY);
            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);
            }

            //for debug purposes
#if (DEBUG)
            //TESTING
            //make a fake server error for ui testing purposes
            if (proposedObj.Count == 666)
            {
                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Count", "Test field server error");
            }
            if (proposedObj.DollarAmount == 666)
            {
                AddError(ApiErrorCode.INVALID_OPERATION, null, "This is a test of a general server error");
            }

            //TESTING
#endif

            return;
        }


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



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //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.TestWidgetJob:
                    await ProcessTestJobAsync(job);
                    break;
                default:
                    throw new System.ArgumentOutOfRangeException($"WidgetBiz.HandleJob-> Invalid job type{job.JobType.ToString()}");
            }
        }


        /// <summary>
        /// /// Handle the test job
        /// </summary>
        /// <param name="job"></param>
        private async Task ProcessTestJobAsync(OpsJob job)
        {
            var sleepTime = 30 * 1000;
            //Simulate a long running job here            
            JobsBiz.UpdateJobStatus(job.GId, JobStatus.Running, ct);
            JobsBiz.LogJob(job.GId, $"WidgetBiz::ProcessTestJob started, sleeping for {sleepTime} seconds...", ct);
            //Uncomment this to test if the job prevents other routes from running
            //result is NO it doesn't prevent other requests, so we are a-ok for now
            await Task.Delay(sleepTime);
            JobsBiz.LogJob(job.GId, "WidgetBiz::ProcessTestJob done sleeping setting job to finished", ct);
            JobsBiz.UpdateJobStatus(job.GId, JobStatus.Completed, ct);

        }

        //Other job handlers here...


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

    }//eoc


}//eons