using ConstructionCompanyContracts.BindingModels;
using ConstructionCompanyContracts.SearchModels;
using ConstructionCompanyContracts.StorageContracts;
using ConstructionCompanyContracts.ViewModels;
using ConstructionCompanyPsqlImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConstructionCompanyPsqlImplement.Implements
{
    public class PositionStorage : IPositionStorage
    {
        private readonly ConstructionCompanyDatabase _source;
        public PositionStorage()
        {
            _source = ConstructionCompanyDatabase.GetInstance();
        }
        public List<PositionViewModel> GetFullList()
        {
            List<PositionViewModel> result = new List<PositionViewModel>();
            foreach (var material in _source.Positions)
            {
                result.Add(material.GetViewModel);
            }
            return result;
        }

        public List<PositionViewModel> GetFilteredList(PositionSearchModel model)
        {
            if (model == null || !model.Id.HasValue && string.IsNullOrEmpty(model.PositionName))
            {
                return new();
            }
            List<PositionViewModel> result = new List<PositionViewModel>();
            if (!string.IsNullOrEmpty(model.PositionName))
            {
                foreach (var material in _source.Positions)
                {
                    if (material.PositionName.Equals(model.PositionName)) result.Add(material.GetViewModel);
                }
                return result;
            }
            else
            {
                foreach (var material in _source.Positions)
                {
                    if (material.Id == model.Id) result.Add(material.GetViewModel);
                }
                return result;
            }
        }

        public PositionViewModel? GetElement(PositionSearchModel model)
        {
            if (model == null || !model.Id.HasValue)
            {
                return new();
            }
            return _source.Positions.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }

        public PositionViewModel? Insert(PositionBindingModel model)
        {
            var command = Position.CreateCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            _source.ExecuteSql(command);
            var newPosition = _source.Positions[_source.Positions.Count - 1];
            return newPosition.GetViewModel;
        }

        public PositionViewModel? Update(PositionBindingModel model)
        {
            var command = Position.UpdateCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            _source.ExecuteSql(command);
            var updatedPosition = _source.Positions.First(x => x.Id == model.Id);
            return updatedPosition.GetViewModel;
        }

        public PositionViewModel? Delete(PositionBindingModel model)
        {
            var command = Position.DeleteCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            var deletedPosition = _source.Positions.First(x => x.Id == model.Id).GetViewModel;
            _source.ExecuteSql(command);
            return deletedPosition;
        }
    }
}