using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.JsonPatch;
using AyaNova.Util;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Models;

namespace AyaNova.Biz
{

    internal class UnitModelBiz : BizObject, ISearchAbleObject
    {

        internal UnitModelBiz(AyContext dbcontext, long currentUserId, long userTranslationId, AuthorizationRoles UserRoles)
        {
            ct = dbcontext;
            UserId = currentUserId;
            UserTranslationId = userTranslationId;
            CurrentUserRoles = UserRoles;
            BizType = AyaType.UnitModel;
        }

        internal static UnitModelBiz GetBiz(AyContext ct, Microsoft.AspNetCore.Http.HttpContext httpContext = null)
        {

            if (httpContext != null)
                return new UnitModelBiz(ct, UserIdFromContext.Id(httpContext.Items), UserTranslationIdFromContext.Id(httpContext.Items), UserRolesFromContext.Roles(httpContext.Items));
            else//when called internally for internal ops there will be no context so need to set default values for that
                return new UnitModelBiz(ct, 1, ServerBootConfig.AYANOVA_DEFAULT_TRANSLATION_ID, AuthorizationRoles.BizAdminFull);
        }



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

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

        internal async Task<UnitModel> GetAsync(long fetchId, bool logTheGetEvent = true)
        {
            //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.UnitModel.SingleOrDefaultAsync(m => m.Id == fetchId);
            if (logTheGetEvent && ret != null)
            {
                //Log
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, fetchId, BizType, AyaEvent.Retrieved), ct);
            }
            return ret;
        }


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

        //Called from route and also seeder
        internal async Task<UnitModel> CreateAsync(UnitModel inObj)
        {
            await ValidateAsync(inObj, null);
            if (HasErrors)
                return null;
            else
            {
                //do stuff with UnitModel
                UnitModel outObj = inObj;

                outObj.Tags = TagUtil.NormalizeTags(outObj.Tags);
                outObj.CustomFields = JsonUtil.CompactJson(outObj.CustomFields);
                //Save to db                              
                await ct.UnitModel.AddAsync(outObj);
                await ct.SaveChangesAsync();
                //Handle child and associated items:                
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), ct);
                await SearchIndexAsync(outObj, true);
                await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, outObj.Tags, null);

                return outObj;
            }
        }




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

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

            UnitModel outObj = new UnitModel();
            CopyObject.Copy(dbObj, outObj, "Wiki");
            // outObj.Name = Util.StringUtil.NameUniquify(outObj.Name, 255);
            //generate unique name
            string newUniqueName = string.Empty;
            bool NotUnique = true;
            long l = 1;
            do
            {
                newUniqueName = Util.StringUtil.UniqueNameBuilder(dbObj.Name, l++, 255);
                NotUnique = await ct.UnitModel.AnyAsync(m => m.Name == newUniqueName);
            } while (NotUnique);

            outObj.Name = newUniqueName;


            outObj.Id = 0;
            outObj.ConcurrencyToken = 0;

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

            //Handle child and associated items:                
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, outObj.Id, BizType, AyaEvent.Created), ct);
            await SearchIndexAsync(outObj, true);
            await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, outObj.Tags, null);
            return outObj;

        }

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

        //put
        internal async Task<bool> PutAsync(UnitModel dbObj, UnitModel inObj)
        {

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

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

            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;


            await ValidateAsync(dbObj, SnapshotOfOriginalDBObj);
            if (HasErrors)
                return false;

            //Log event and save context          
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, dbObj.Id, BizType, AyaEvent.Modified), ct);
            await SearchIndexAsync(dbObj, false);
            await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, dbObj.Tags, SnapshotOfOriginalDBObj.Tags);

            return true;
        }

        //patch
        internal async Task<bool> PatchAsync(UnitModel dbObj, JsonPatchDocument<UnitModel> objectPatch, uint concurrencyToken)
        {
            //Validate Patch is allowed            
            if (!ValidateJsonPatch<UnitModel>.Validate(this, objectPatch)) return false;

            //make a snapshot of the original for validation but update the original to preserve workflow           
            UnitModel SnapshotOfOriginalDBObj = new UnitModel();
            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;
            await ValidateAsync(dbObj, SnapshotOfOriginalDBObj);
            if (HasErrors)
                return false;

            //Log event and save context
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, dbObj.Id, BizType, AyaEvent.Modified), ct);
            await SearchIndexAsync(dbObj, false);

            await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, dbObj.Tags, SnapshotOfOriginalDBObj.Tags);

            return true;
        }


        private async Task SearchIndexAsync(UnitModel obj, bool isNew)
        {
            //SEARCH INDEXING
            var SearchParams = new Search.SearchIndexProcessObjectParameters(UserTranslationId, obj.Id, BizType);
            SearchParams.AddText(obj.Notes).AddText(obj.Name).AddText(obj.Wiki).AddText(obj.Tags).AddCustomFields(obj.CustomFields);

            if (isNew)
                await Search.ProcessNewObjectKeywordsAsync(SearchParams);
            else
                await Search.ProcessUpdatedObjectKeywordsAsync(SearchParams);
        }

        public async Task<Search.SearchIndexProcessObjectParameters> GetSearchResultSummary(long id)
        {
            var obj = await ct.UnitModel.SingleOrDefaultAsync(m => m.Id == id);
            var SearchParams = new Search.SearchIndexProcessObjectParameters();
            if (obj != null)
                SearchParams.AddText(obj.Notes).AddText(obj.Name).AddText(obj.Wiki).AddText(obj.Tags).AddCustomFields(obj.CustomFields);
            return SearchParams;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(UnitModel dbObj)
        {
            //Determine if the object can be deleted, do the deletion tentatively
            //Probably also in here deal with tags and associated search text etc

            //NOT REQUIRED NOW BUT IF IN FUTURE ValidateCanDelete(dbObj);
            if (HasErrors)
                return false;
            ct.UnitModel.Remove(dbObj);
            await ct.SaveChangesAsync();

            //Log event 
            await EventLogProcessor.DeleteObjectLogAsync(UserId, BizType, dbObj.Id, dbObj.Name, ct);
            await Search.ProcessDeletedObjectKeywordsAsync(dbObj.Id, BizType);
            await TagUtil.ProcessDeleteTagsInRepositoryAsync(ct, dbObj.Tags);
            return true;
        }



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

        //Can save or update?
        private async Task ValidateAsync(UnitModel proposedObj, UnitModel currentObj)
        {

            //run validation and biz rules
            bool isNew = currentObj == null;

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


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

        }


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



        ////////////////////////////////////////////////////////////////////////////////////////////////
        //JOB / OPERATIONS
        //


        //Other job handlers here...


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

    }//eoc


}//eons