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 EmployeeStorage : IEmployeeStorage
    {
        private readonly ConstructionCompanyDatabase _source;
        public EmployeeStorage()
        {
            _source = ConstructionCompanyDatabase.GetInstance();
        }
        public List<EmployeeViewModel> GetFullList()
        {
            List<EmployeeViewModel> result = new List<EmployeeViewModel>();
            foreach (var material in _source.Employees)
            {
                result.Add(material.GetViewModel);
            }
            return result;
        }

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

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

        public EmployeeViewModel? Insert(EmployeeBindingModel model)
        {
            var command = Employee.CreateCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            _source.ExecuteSql(command);
            var newEmployee = _source.Employees[_source.Employees.Count - 1];
            return newEmployee.GetViewModel;
        }

        public EmployeeViewModel? Update(EmployeeBindingModel model)
        {
            var command = Employee.UpdateCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            _source.ExecuteSql(command);
            var updatedEmployee = _source.Employees.First(x => x.Id == model.Id);
            return updatedEmployee.GetViewModel;
        }

        public EmployeeViewModel? Delete(EmployeeBindingModel model)
        {
            var command = Employee.DeleteCommand(model);
            if (string.IsNullOrEmpty(command))
            {
                return null;
            }
            var deletedEmployee = _source.Employees.First(x => x.Id == model.Id).GetViewModel;
            _source.ExecuteSql(command);
            return deletedEmployee;
        }
    }
}