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 WorkOrderBiz : BizObject, ISearchAbleObject
    {
        //Feature specific roles
        internal static AuthorizationRoles RolesAllowedToChangeSerial = AuthorizationRoles.BizAdminFull | AuthorizationRoles.DispatchFull | AuthorizationRoles.AccountingFull;

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

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

            if (httpContext != null)
                return new WorkOrderBiz(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 WorkOrderBiz(ct, 1, ServerBootConfig.AYANOVA_DEFAULT_TRANSLATION_ID, AuthorizationRoles.BizAdminFull);
        }

        #region Workorder level

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

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<WorkOrder> CreateAsync(WorkOrder newObject)
        {
            await ValidateAsync(newObject, null);
            if (HasErrors)
                return null;
            else
            {
                newObject.Serial = ServerBootConfig.WORKORDER_SERIAL.GetNext();
                newObject.Tags = TagUtil.NormalizeTags(newObject.Tags);
                newObject.CustomFields = JsonUtil.CompactJson(newObject.CustomFields);
                await ct.WorkOrder.AddAsync(newObject);
                await ct.SaveChangesAsync();
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, AyaEvent.Created), ct);
                await SearchIndexAsync(newObject, true);
                await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, newObject.Tags, null);
                return newObject;
            }
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DUPLICATE
        //
        internal async Task<WorkOrder> DuplicateAsync(long id)
        {
            WorkOrder dbObject = await GetAsync(id, false);
            if (dbObject == null)
            {
                AddError(ApiErrorCode.NOT_FOUND, "id");
                return null;
            }
            WorkOrder newObject = new WorkOrder();
            CopyObject.Copy(dbObject, newObject, "Wiki");
            newObject.Serial = ServerBootConfig.WORKORDER_SERIAL.GetNext();
            newObject.Id = 0;
            newObject.ConcurrencyToken = 0;
            await ct.WorkOrder.AddAsync(newObject);
            await ct.SaveChangesAsync();
            await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, AyaEvent.Created), ct);
            await SearchIndexAsync(newObject, true);
            await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, newObject.Tags, null);
            return newObject;
        }



        ////////////////////////////////////////////////////////////////////////////////////////////////
        // GET 
        //    
        internal async Task<WorkOrder> GetAsync(long id, bool logTheGetEvent = true)
        {
            //https://docs.microsoft.com/en-us/ef/core/querying/related-data
            //docs say this will not query twice but will recognize the duplicate woitem bit which is required for multiple grandchild collections
            var ret =
            await ct.WorkOrder
            .Include(w => w.WorkorderItems)
                .ThenInclude(wi => wi.WorkorderItemLabors)
             .Include(w => w.WorkorderItems)
                .ThenInclude(wi => wi.WorkorderItemParts)
            .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<WorkOrder> PutAsync(long id, WorkOrder putObj)
        {
            //TODO: THIS IS ALL WRONG, NEEDS TO HANDLE DESCENDENTS WITH TAGS AND SUCH
            //IDEALLY IT SHOULD CALL THE OTHER METHODS TO HANDLE THEM INDIVIDUALLY   
            //OR...SHOULD IT ONLY EVER HANDLE THE TOP LEVEL....hmmm....
            //I guess it would work if it traversed the input workorder and did each bit individually

            WorkOrder dbObject = await GetAsync(id, false);
            if (dbObject == null)
            {
                AddError(ApiErrorCode.NOT_FOUND, "id");
                return null;
            }

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

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

            //if user has rights then change it, otherwise just ignore it and do the rest
            if (SnapshotOfOriginalDBObj.Serial != putObj.Serial && Authorized.HasAnyRole(CurrentUserRoles, RolesAllowedToChangeSerial))
            {
                dbObject.Serial = putObj.Serial;
            }

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

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


            await ValidateAsync(dbObject, SnapshotOfOriginalDBObj);
            if (HasErrors)
                return null;

            //  try
            //             {
            //                 if (o==null)
            //                     return BadRequest(new ApiErrorResponse(biz.Errors));
            //             }
            //             catch (DbUpdateConcurrencyException)
            //             {
            //                 if (!await biz.ExistsAsync(id))
            //                     return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            //                 else
            //                     return StatusCode(409, new ApiErrorResponse(ApiErrorCode.CONCURRENCY_CONFLICT));
            //             }


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

            return dbObject;
        }



        private async Task SearchIndexAsync(WorkOrder obj, bool isNew)
        {
            //SEARCH INDEXING
            var SearchParams = new Search.SearchIndexProcessObjectParameters(UserTranslationId, obj.Id, BizType);
            SearchParams.AddText(obj.Notes).AddText(obj.Serial).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.WorkOrder.SingleOrDefaultAsync(m => m.Id == id);
            var SearchParams = new Search.SearchIndexProcessObjectParameters();
            if (obj != null)
                SearchParams.AddText(obj.Notes).AddText(obj.Serial).AddText(obj.Wiki).AddText(obj.Tags).AddCustomFields(obj.CustomFields);
            return SearchParams;
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //DELETE
        //
        internal async Task<bool> DeleteAsync(WorkOrder dbObj)
        {


            // NOT REQUIRED NOW BUT IF IN FUTURE ValidateCanDelete(dbObj);
            if (HasErrors)
                return false;

            ct.WorkOrder.Remove(dbObj);
            await ct.SaveChangesAsync();

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


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

        //Can save or update?
        private async Task ValidateAsync(WorkOrder proposedObj, WorkOrder 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.WorkOrder.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.WorkOrder.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(WorkOrder inObj)
        // {
        //     //whatever needs to be check to delete this object
        // }
        #endregion workorder level


        #region WorkOrderItem level

        ////////////////////////////////////////////////////////////////////////////////////////////////
        //CREATE   
        //
        internal async Task<WorkOrder> CreateItemAsync(WorkOrderItem newObject)
        {
            await ValidateAsync(newObject, null);
            if (HasErrors)
                return null;
            else
            {
                newObject.Serial = ServerBootConfig.WORKORDER_SERIAL.GetNext();
                newObject.Tags = TagUtil.NormalizeTags(newObject.Tags);
                newObject.CustomFields = JsonUtil.CompactJson(newObject.CustomFields);
                await ct.WorkOrder.AddAsync(newObject);
                await ct.SaveChangesAsync();
                await EventLogProcessor.LogEventToDatabaseAsync(new Event(UserId, newObject.Id, BizType, AyaEvent.Created), ct);
                await SearchIndexAsync(newObject, true);
                await TagUtil.ProcessUpdateTagsInRepositoryAsync(ct, newObject.Tags, null);
                return newObject;
            }
        }


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

        //Can save or update?
        private async Task ValidateItemAsync(WorkOrderItem proposedObj, WorkOrderItem 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.WorkOrder.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.WorkOrder.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(WorkOrder inObj)
        // {
        //     //whatever needs to be check to delete this object
        // }
        #endregion work order item level





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


        //Other job handlers here...


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

    }//eoc


}//eons