using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StorageContracts;
using LawFirmContracts.ViewModels;
using LawFirmDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata.Ecma335;
using System.Text;
using System.Threading.Tasks;

namespace LawFirmDatabaseImplement.Implements
{
    public class DocumentStorage : IDocumentStorage
    {
        public DocumentViewModel? GetElement(DocumentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DocumentName) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new LawFirmDatabase();
            return context.Documents.Include(x => x.Blanks)
             .ThenInclude(x => x.Blank)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.DocumentName) &&
            x.DocumentName == model.DocumentName) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }

        public List<DocumentViewModel> GetFilteredList(DocumentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DocumentName))
            {
                return new();
            }
            using var context = new LawFirmDatabase();
            return context.Documents
             .Include(x => x.Blanks)
            .ThenInclude(x => x.Blank)
            .Where(x => x.DocumentName.Contains(model.DocumentName))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<DocumentViewModel> GetFullList()
        {
            using var context = new LawFirmDatabase();
            return context.Documents
             .Include(x => x.Blanks)
            .ThenInclude(x => x.Blank)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public DocumentViewModel? Insert(DocumentBindingModel model)
        {
            using var context = new LawFirmDatabase();
            using var transaction = context.Database.BeginTransaction();
            {
                try
                {
                    var newDoc = Document.Create(context, model);
                    if (newDoc == null)
                    {
                        transaction.Rollback();
                        return null;
                    }
                    context.Documents.Add(newDoc);

                    context.SaveChanges();
                    context.Database.CommitTransaction();

                    return newDoc.GetViewModel;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return null;
                }
            }
        }

        public DocumentViewModel? Update(DocumentBindingModel model)
        {
            using var context = new LawFirmDatabase();
            using var transaction = context.Database.BeginTransaction();
            {
                try
                {
                    var document = context.Documents.FirstOrDefault(x => x.Id == model.Id);
                    if (document == null)
                    {
                        transaction.Rollback();
                        return null;
                    }

                    document.Update(model);
                    document.UpdateComponents(context, model);

                    context.SaveChanges();
                    context.Database.CommitTransaction();

                    return document.GetViewModel;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return null;
                }
            }
        }
        public DocumentViewModel? Delete(DocumentBindingModel model)
        {
            using var context = new LawFirmDatabase();
            var element = context.Documents.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Documents.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

    }
}