using System;
using System.Data;
using System.Linq;
using System.Linq.Dynamic.Core;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Text.Encodings.Web;
using Microsoft.AspNetCore.Components;
using Microsoft.EntityFrameworkCore;
using Radzen;

using ILoan.Rules.Web.Data;
using DocumentFormat.OpenXml.InkML;
using ILoan.Rules.Web.Models.Enums;
using ILoan.Rules.Web.Extensions;

namespace ILoan.Rules.Web
{
    public partial class RulesService
    {
        RulesContext Context
        {
           get
           {
             return this.context;
           }
        }

        private readonly RulesContext context;
        private readonly NavigationManager navigationManager;

        public RulesService(RulesContext context, NavigationManager navigationManager)
        {
            this.context = context;
            this.navigationManager = navigationManager;
        }

        public void Reset() => Context.ChangeTracker.Entries().Where(e => e.Entity != null).ToList().ForEach(e => e.State = EntityState.Detached);

        public void ApplyQuery<T>(ref IQueryable<T> items, Query query = null)
        {
            if (query != null)
            {
                if (!string.IsNullOrEmpty(query.Filter))
                {
                    if (query.FilterParameters != null)
                    {
                        items = items.Where(query.Filter, query.FilterParameters);
                    }
                    else
                    {
                        items = items.Where(query.Filter);
                    }
                }

                if (!string.IsNullOrEmpty(query.OrderBy))
                {
                    items = items.OrderBy(query.OrderBy);
                }

                if (query.Skip.HasValue)
                {
                    items = items.Skip(query.Skip.Value);
                }

                if (query.Top.HasValue)
                {
                    items = items.Take(query.Top.Value);
                }
            }
        }


        public async Task ExportCoreRuleCriteriaOperatorsToExcel(Query query = null, string fileName = null)
        {
            navigationManager.NavigateTo(query != null ? query.ToUrl($"export/rules/corerulecriteriaoperators/excel(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')") : $"export/rules/corerulecriteriaoperators/excel(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')", true);
        }

        public async Task ExportCoreRuleCriteriaOperatorsToCSV(Query query = null, string fileName = null)
        {
            navigationManager.NavigateTo(query != null ? query.ToUrl($"export/rules/corerulecriteriaoperators/csv(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')") : $"export/rules/corerulecriteriaoperators/csv(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')", true);
        }

        partial void OnCoreRuleCriteriaOperatorsRead(ref IQueryable<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> items);

        public async Task<IQueryable<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator>> GetCoreRuleCriteriaOperators(Query query = null)
        {
            var items = Context.CoreRuleCriteriaOperators.AsQueryable();

            items = items.Include(i => i.CoreRule);

            if (query != null)
            {
                if (!string.IsNullOrEmpty(query.Expand))
                {
                    var propertiesToExpand = query.Expand.Split(',');
                    foreach(var p in propertiesToExpand)
                    {
                        items = items.Include(p.Trim());
                    }
                }

                ApplyQuery(ref items, query);
            }

            OnCoreRuleCriteriaOperatorsRead(ref items);

            return await Task.FromResult(items);
        }

        partial void OnCoreRuleCriteriaOperatorGet(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);
        partial void OnGetCoreRuleCriteriaOperatorById(ref IQueryable<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> items);


        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> GetCoreRuleCriteriaOperatorById(int id)
        {
            var items = Context.CoreRuleCriteriaOperators
                              .AsNoTracking()
                              .Where(i => i.ID == id);

            items = items.Include(i => i.CoreRule);
 
            OnGetCoreRuleCriteriaOperatorById(ref items);

            var itemToReturn = items.FirstOrDefault();

            OnCoreRuleCriteriaOperatorGet(itemToReturn);

            return await Task.FromResult(itemToReturn);
        }

        partial void OnCoreRuleCriteriaOperatorCreated(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);
        partial void OnAfterCoreRuleCriteriaOperatorCreated(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> CreateCoreRuleCriteriaOperator(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator corerulecriteriaoperator)
        {
            OnCoreRuleCriteriaOperatorCreated(corerulecriteriaoperator);

            var existingItem = Context.CoreRuleCriteriaOperators
                              .Where(i => i.ID == corerulecriteriaoperator.ID)
                              .FirstOrDefault();

            if (existingItem != null)
            {
               throw new Exception("Item already available");
            }            

            try
            {
                Context.CoreRuleCriteriaOperators.Add(corerulecriteriaoperator);
                Context.SaveChanges();
            }
            catch
            {
                Context.Entry(corerulecriteriaoperator).State = EntityState.Detached;
                throw;
            }

            OnAfterCoreRuleCriteriaOperatorCreated(corerulecriteriaoperator);

            return corerulecriteriaoperator;
        }

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> CancelCoreRuleCriteriaOperatorChanges(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item)
        {
            var entityToCancel = Context.Entry(item);
            if (entityToCancel.State == EntityState.Modified)
            {
              entityToCancel.CurrentValues.SetValues(entityToCancel.OriginalValues);
              entityToCancel.State = EntityState.Unchanged;
            }

            return item;
        }

        partial void OnCoreRuleCriteriaOperatorUpdated(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);
        partial void OnAfterCoreRuleCriteriaOperatorUpdated(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> UpdateCoreRuleCriteriaOperator(int id, ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator corerulecriteriaoperator)
        {
            OnCoreRuleCriteriaOperatorUpdated(corerulecriteriaoperator);

            var itemToUpdate = Context.CoreRuleCriteriaOperators
                              .Where(i => i.ID == corerulecriteriaoperator.ID)
                              .FirstOrDefault();

            if (itemToUpdate == null)
            {
               throw new Exception("Item no longer available");
            }
                
            var entryToUpdate = Context.Entry(itemToUpdate);
            entryToUpdate.CurrentValues.SetValues(corerulecriteriaoperator);
            entryToUpdate.State = EntityState.Modified;

            Context.SaveChanges();

            OnAfterCoreRuleCriteriaOperatorUpdated(corerulecriteriaoperator);

            return corerulecriteriaoperator;
        }

        partial void OnCoreRuleCriteriaOperatorDeleted(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);
        partial void OnAfterCoreRuleCriteriaOperatorDeleted(ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriteriaOperator> DeleteCoreRuleCriteriaOperator(int id)
        {
            var itemToDelete = Context.CoreRuleCriteriaOperators
                              .Where(i => i.ID == id)
                              .FirstOrDefault();

            if (itemToDelete == null)
            {
               throw new Exception("Item no longer available");
            }

            OnCoreRuleCriteriaOperatorDeleted(itemToDelete);


            Context.CoreRuleCriteriaOperators.Remove(itemToDelete);

            try
            {
                Context.SaveChanges();
            }
            catch
            {
                Context.Entry(itemToDelete).State = EntityState.Unchanged;
                throw;
            }

            OnAfterCoreRuleCriteriaOperatorDeleted(itemToDelete);

            return itemToDelete;
        }
    
        public async Task ExportCoreRulesToExcel(Query query = null, string fileName = null)
        {
            navigationManager.NavigateTo(query != null ? query.ToUrl($"export/rules/corerules/excel(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')") : $"export/rules/corerules/excel(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')", true);
        }

        public async Task ExportCoreRulesToCSV(Query query = null, string fileName = null)
        {
            navigationManager.NavigateTo(query != null ? query.ToUrl($"export/rules/corerules/csv(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')") : $"export/rules/corerules/csv(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')", true);
        }

        partial void OnCoreRulesRead(ref IQueryable<ILoan.Rules.Web.Models.Rules.CoreRule> items);

        public async Task<IQueryable<ILoan.Rules.Web.Models.Rules.CoreRule>> GetCoreRules(Query query = null)
        {
            var items = Context.CoreRules.AsQueryable();


            if (query != null)
            {
                if (!string.IsNullOrEmpty(query.Expand))
                {
                    var propertiesToExpand = query.Expand.Split(',');
                    foreach(var p in propertiesToExpand)
                    {
                        items = items.Include(p.Trim());
                    }
                }

                ApplyQuery(ref items, query);
            }

            OnCoreRulesRead(ref items);

            return await Task.FromResult(items);
        }

        partial void OnCoreRuleGet(ILoan.Rules.Web.Models.Rules.CoreRule item);
        partial void OnGetCoreRuleById(ref IQueryable<ILoan.Rules.Web.Models.Rules.CoreRule> items);


        public async Task<ILoan.Rules.Web.Models.Rules.CoreRule> GetCoreRuleById(int id)
        {
            var items = Context.CoreRules
                              .AsNoTracking()
                              .Where(i => i.ID == id);

 
            OnGetCoreRuleById(ref items);

            var itemToReturn = items.FirstOrDefault();

            OnCoreRuleGet(itemToReturn);

            return await Task.FromResult(itemToReturn);
        }

        partial void OnCoreRuleCreated(ILoan.Rules.Web.Models.Rules.CoreRule item);
        partial void OnAfterCoreRuleCreated(ILoan.Rules.Web.Models.Rules.CoreRule item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRule> CreateCoreRule(ILoan.Rules.Web.Models.Rules.CoreRule corerule)
        {
            OnCoreRuleCreated(corerule);

            var existingItem = Context.CoreRules
                              .Where(i => i.ID == corerule.ID)
                              .FirstOrDefault();

            if (existingItem != null)
            {
               throw new Exception("Item already available");
            }            

            try
            {
                Context.CoreRules.Add(corerule);
                Context.SaveChanges();
            }
            catch
            {
                Context.Entry(corerule).State = EntityState.Detached;
                throw;
            }

            OnAfterCoreRuleCreated(corerule);

            return corerule;
        }

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRule> CancelCoreRuleChanges(ILoan.Rules.Web.Models.Rules.CoreRule item)
        {
            var entityToCancel = Context.Entry(item);
            if (entityToCancel.State == EntityState.Modified)
            {
              entityToCancel.CurrentValues.SetValues(entityToCancel.OriginalValues);
              entityToCancel.State = EntityState.Unchanged;
            }

            return item;
        }

        partial void OnCoreRuleUpdated(ILoan.Rules.Web.Models.Rules.CoreRule item);
        partial void OnAfterCoreRuleUpdated(ILoan.Rules.Web.Models.Rules.CoreRule item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRule> UpdateCoreRule(int id, ILoan.Rules.Web.Models.Rules.CoreRule corerule)
        {
            OnCoreRuleUpdated(corerule);

            var itemToUpdate = Context.CoreRules
                              .Where(i => i.ID == corerule.ID)
                              .FirstOrDefault();

            if (itemToUpdate == null)
            {
               throw new Exception("Item no longer available");
            }
                
            var entryToUpdate = Context.Entry(itemToUpdate);
            entryToUpdate.CurrentValues.SetValues(corerule);
            entryToUpdate.State = EntityState.Modified;

            Context.SaveChanges();

            OnAfterCoreRuleUpdated(corerule);

            return corerule;
        }

        partial void OnCoreRuleDeleted(ILoan.Rules.Web.Models.Rules.CoreRule item);
        partial void OnAfterCoreRuleDeleted(ILoan.Rules.Web.Models.Rules.CoreRule item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRule> DeleteCoreRule(int id)
        {
            var itemToDelete = Context.CoreRules
                              .Where(i => i.ID == id)
                              .Include(i => i.CoreRuleCriteria)
                              .Include(i => i.CoreRuleCriteriaOperators)
                              .FirstOrDefault();

            if (itemToDelete == null)
            {
               throw new Exception("Item no longer available");
            }

            OnCoreRuleDeleted(itemToDelete);


            Context.CoreRules.Remove(itemToDelete);

            try
            {
                Context.SaveChanges();
            }
            catch
            {
                Context.Entry(itemToDelete).State = EntityState.Unchanged;
                throw;
            }

            OnAfterCoreRuleDeleted(itemToDelete);

            return itemToDelete;
        }
    
        public async Task ExportCoreRuleCriteriaToExcel(Query query = null, string fileName = null)
        {
            navigationManager.NavigateTo(query != null ? query.ToUrl($"export/rules/corerulecriteria/excel(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')") : $"export/rules/corerulecriteria/excel(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')", true);
        }

        public async Task ExportCoreRuleCriteriaToCSV(Query query = null, string fileName = null)
        {
            navigationManager.NavigateTo(query != null ? query.ToUrl($"export/rules/corerulecriteria/csv(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')") : $"export/rules/corerulecriteria/csv(fileName='{(!string.IsNullOrEmpty(fileName) ? UrlEncoder.Default.Encode(fileName) : "Export")}')", true);
        }

        partial void OnCoreRuleCriteriaRead(ref IQueryable<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> items);

        public async Task<IQueryable<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion>> GetCoreRuleCriteria(Query query = null)
        {
            var items = Context.CoreRuleCriteria.AsQueryable();

            items = items.Include(i => i.CoreRule);

            if (query != null)
            {
                if (!string.IsNullOrEmpty(query.Expand))
                {
                    var propertiesToExpand = query.Expand.Split(',');
                    foreach(var p in propertiesToExpand)
                    {
                        items = items.Include(p.Trim());
                    }
                }

                ApplyQuery(ref items, query);
            }

            OnCoreRuleCriteriaRead(ref items);

            return await Task.FromResult(items);
        }

        partial void OnCoreRuleCriterionGet(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);
        partial void OnGetCoreRuleCriterionById(ref IQueryable<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> items);


        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> GetCoreRuleCriterionById(int id)
        {
            var items = Context.CoreRuleCriteria
                              .AsNoTracking()
                              .Where(i => i.ID == id);

            items = items.Include(i => i.CoreRule);
 
            OnGetCoreRuleCriterionById(ref items);

            var itemToReturn = items.FirstOrDefault();

            OnCoreRuleCriterionGet(itemToReturn);

            return await Task.FromResult(itemToReturn);
        }

        partial void OnCoreRuleCriterionCreated(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);
        partial void OnAfterCoreRuleCriterionCreated(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> CreateCoreRuleCriterion(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion corerulecriterion)
        {
            OnCoreRuleCriterionCreated(corerulecriterion);

            var existingItem = Context.CoreRuleCriteria
                              .Where(i => i.ID == corerulecriterion.ID)
                              .FirstOrDefault();

            if (existingItem != null)
            {
               throw new Exception("Item already available");
            }            

            try
            {
                Context.CoreRuleCriteria.Add(corerulecriterion);
                Context.SaveChanges();
            }
            catch
            {
                Context.Entry(corerulecriterion).State = EntityState.Detached;
                throw;
            }

            OnAfterCoreRuleCriterionCreated(corerulecriterion);

            return corerulecriterion;
        }

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> CancelCoreRuleCriterionChanges(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item)
        {
            var entityToCancel = Context.Entry(item);
            if (entityToCancel.State == EntityState.Modified)
            {
              entityToCancel.CurrentValues.SetValues(entityToCancel.OriginalValues);
              entityToCancel.State = EntityState.Unchanged;
            }

            return item;
        }

        partial void OnCoreRuleCriterionUpdated(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);
        partial void OnAfterCoreRuleCriterionUpdated(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> UpdateCoreRuleCriterion(int id, ILoan.Rules.Web.Models.Rules.CoreRuleCriterion corerulecriterion)
        {
            OnCoreRuleCriterionUpdated(corerulecriterion);

            var itemToUpdate = Context.CoreRuleCriteria
                              .Where(i => i.ID == corerulecriterion.ID)
                              .FirstOrDefault();

            if (itemToUpdate == null)
            {
               throw new Exception("Item no longer available");
            }
                
            var entryToUpdate = Context.Entry(itemToUpdate);
            entryToUpdate.CurrentValues.SetValues(corerulecriterion);
            entryToUpdate.State = EntityState.Modified;

            Context.SaveChanges();

            OnAfterCoreRuleCriterionUpdated(corerulecriterion);

            return corerulecriterion;
        }

        partial void OnCoreRuleCriterionDeleted(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);
        partial void OnAfterCoreRuleCriterionDeleted(ILoan.Rules.Web.Models.Rules.CoreRuleCriterion item);

        public async Task<ILoan.Rules.Web.Models.Rules.CoreRuleCriterion> DeleteCoreRuleCriterion(int id)
        {
            var itemToDelete = Context.CoreRuleCriteria
                              .Where(i => i.ID == id)
                              .FirstOrDefault();

            if (itemToDelete == null)
            {
               throw new Exception("Item no longer available");
            }

            OnCoreRuleCriterionDeleted(itemToDelete);


            Context.CoreRuleCriteria.Remove(itemToDelete);

            try
            {
                Context.SaveChanges();
            }
            catch
            {
                Context.Entry(itemToDelete).State = EntityState.Unchanged;
                throw;
            }

            OnAfterCoreRuleCriterionDeleted(itemToDelete);

            return itemToDelete;
        }

        // get properties from CoreRuleCriterion as a disctinct list for type ahead
        public List<string> GetProperties()
        {
            var properties = context.CoreRuleCriteria.Select(c => c.Property).Distinct().OrderBy(x => x).ToList();
            return properties;
        }

        public List<string> GetComparisons()
        {
            return EnumExtensions.ToList<RuleComparison>();
        }
    }



}