using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TaskTrackerContracts.BindingModels;
using TaskTrackerContracts.BusinessLogicsContracts;
using TaskTrackerContracts.SearchModels;
using TaskTrackerContracts.StoragesContracts;
using TaskTrackerContracts.ViewModels;

namespace TaskTrackerBusinessLogics.BusinessLogic
{
    public class ProjectLogic : IProjectLogic
    {
        private readonly IProjectStorage _projectStorage;
        public ProjectLogic(IProjectStorage projectStorage)
        {
            _projectStorage = projectStorage;
        }
        public List<ProjectViewModel>? ReadList(ProjectSearchModel? model)
        {
            var list = model == null ? _projectStorage.GetFullList() : _projectStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }
        public ProjectViewModel? ReadElement(ProjectSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _projectStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }
        public bool Create(ProjectBindingModel model)
        {
            CheckModel(model);
            if (_projectStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }
        public bool Update(ProjectBindingModel model)
        {
            CheckModel(model);
            if (_projectStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }
        public bool Delete(ProjectBindingModel model)
        {
            CheckModel(model, false);
            if (_projectStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }
        private void CheckModel(ProjectBindingModel model, bool withParams =
       true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.ProjectName))
            {
                throw new ArgumentNullException("Нет названия",
               nameof(model.ProjectName));
            }
            var element = _projectStorage.GetElement(new ProjectSearchModel
            {
                ProjectName = model.ProjectName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Проект с таким названием уже есть");
            }
        }
    }
}