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 MaterialStorage : IMaterialStorage
    {
        private readonly ConstructionCompanyDatabase _source;
        public MaterialStorage()
        {
            _source = ConstructionCompanyDatabase.GetInstance();
        }
        public List<MaterialViewModel> GetFullList()
        {
            List<MaterialViewModel> result = new List<MaterialViewModel>();
            foreach (var material in _source.Materials)
            {
                result.Add(material.GetViewModel);
            }
            return result;
        }

        public List<MaterialViewModel> GetFilteredList(MaterialSearchModel model)
        {
            if (model == null || !model.Id.HasValue || string.IsNullOrEmpty(model.MaterialName))
            {
                return new();
            }
            List<MaterialViewModel> result = new List<MaterialViewModel>();
            if (!string.IsNullOrEmpty(model.MaterialName))
            {
                foreach (var material in _source.Materials)
                {
                    if (material.MaterialName.Equals(model.MaterialName)) result.Add(material.GetViewModel);
                }
                return result;
            }
            else
            {
                foreach (var material in _source.Materials)
                {
                    if (material.Id == model.Id) result.Add(material.GetViewModel);
                }
                return result;
            }
        }

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

        public MaterialViewModel? Insert(MaterialBindingModel model)
        {
            var command = Material.CreateCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            _source.ExecuteSql(command);
            var newMaterial = _source.Materials[_source.Materials.Count - 1];
            return newMaterial.GetViewModel;
        }

        public MaterialViewModel? Update(MaterialBindingModel model)
        {
            var command = Material.UpdateCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            _source.ExecuteSql(command);
            var updatedMaterial = _source.Materials.First(x => x.Id == model.Id);
            return updatedMaterial.GetViewModel;
        }

        public MaterialViewModel? Delete(MaterialBindingModel model)
        {
            var command = Material.DeleteCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            var deletedMaterial = _source.Materials.First(x => x.Id == model.Id).GetViewModel;
            _source.ExecuteSql(command);
            return deletedMaterial;
        }
        public List<EmployeeViewModel>? GetEmployeesUsingMaterial(MaterialBindingModel model)
        {
            var command = Material.GetEmployeeCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            var employeesId = _source.ExecuteReader(command);
            List<EmployeeViewModel> employees = new List<EmployeeViewModel>();
            foreach (var id in employeesId)
            {
                employees.Add(_source.Employees.First(x => x.Id == id).GetViewModel);
            }
            return employees;
        }
    }
}