using AutoMapper;
using AutoMapper.QueryableExtensions;
using IRaCIS.Application.Interfaces;
using IRaCIS.Application.ViewModels;
using IRaCIS.Core.Application.Contracts.RequestAndResponse;
using IRaCIS.Core.Domain.Interfaces;
using IRaCIS.Core.Domain.Models;
using System;
using System.Linq;

namespace IRaCIS.Application.Services
{
    public class RoleService : IRoleService
    {
        private readonly IRoleRepository _roleRepository;
        private readonly IUserRoleRepository _userRoleRepository;
        private readonly IMapper _mapper;
        public RoleService(IRoleRepository roleRepository,
            IUserRoleRepository userRoleRepository, IMapper mapper
           )
        {
            _roleRepository = roleRepository;
            _userRoleRepository = userRoleRepository;
            _mapper = mapper;
        }

        public IResponseOutput AddOrUpdateRole(RoleCommand role, Guid userId)
        {
            if (role.Id == Guid.Empty|| role.Id ==null)
            {
                var exist = _roleRepository.GetAll().FirstOrDefault(u => u.RoleName == role.RoleName);
                if (exist != null)
                {
                    return ResponseOutput.NotOk("Same role name is existed");
                }
                var result = _roleRepository.Add(_mapper.Map<Role>(role));

                return ResponseOutput.Result(_roleRepository.SaveChanges());

            }
            else
            {
                var exist = _roleRepository.GetAll().FirstOrDefault(u => u.RoleName == role.RoleName && u.Id != role.Id);
                if (exist != null)
                {
                    return ResponseOutput.NotOk("Same role name is existed");
                }
                var success = _roleRepository.Update(t => t.Id == role.Id, u => new Role()
                {
                    UpdateTime = DateTime.Now,
                    UpdateUserId = userId,
                    RoleName = role.RoleName,
                    PrivilegeLevel = role.PrivilegeLevel,
                    RoleDescription = role.RoleDescription
                });

                return ResponseOutput.Result(success);
            }
        }

        //public IResponseOutput<Guid> CopyRole(Guid sourceRoleId, RoleAddOrUpdateModel role)
        //{
        //    var exist = _roleRepository.GetAll().FirstOrDefault(u => u.RoleName == role.RoleName);
        //    if (exist != null)
        //    {
        //        return new IResponseOutput<Guid> { IsSuccess = false, ErrorMessage = "Role Name is existed", Result = Guid.Empty };
        //    }
        //    var result = _roleRepository.Add(_mapper.Map<Role>(role));

        //    var roleMenu = _roleMenuRepository.Find(u => u.RoleId == sourceRoleId);
        //    //var roleFunction = _roleFunctionRepository.Find(u => u.RoleId == sourceRoleId);


        //    if (_roleRepository.SaveChanges())
        //    {
        //        foreach (var item in roleMenu)
        //        {
        //            item.Id = Guid.Empty;
        //            item.RoleId = result.Id;
        //            _roleMenuRepository.Add(item);
        //        };
        //        _roleMenuRepository.SaveChanges();

        //        //foreach (var roleFunctionItem in roleFunction)
        //        //{
        //        //    roleFunctionItem.Id = Guid.Empty;
        //        //    roleFunctionItem.RoleId = result.Id;
        //        //    _roleFunctionRepository.Add(roleFunctionItem);
        //        //};
        //        //_roleFunctionRepository.SaveChanges();

        //        return new IResponseOutput<Guid> { IsSuccess = true, Result = result.Id };
        //    }
        //    return new IResponseOutput<Guid> { IsSuccess = false, ErrorMessage = ConstClass.AddFailed, Result = Guid.Empty }; 
        //}

        public IResponseOutput DeleteRole(Guid roleId)
        {
            //删除角色，需要判断该角色是否被使用
            var exist = _userRoleRepository.GetAll().FirstOrDefault(u => u.RoleId == roleId);
            if (exist != null)
                return ResponseOutput.NotOk("This role is used,can not delete.");
            
            var result = _roleRepository.Delete(u => u.Id == roleId);
            return ResponseOutput.Result(result);
        }


        public PageOutput<RoleDTO> GetRoleListByPage(int pageIndex, int pageSize)
        {
            var count = _roleRepository.GetCount();
            var data = _roleRepository.Find(pageSize, pageIndex, true, u => u.RoleName).ProjectTo<RoleDTO>(_mapper.ConfigurationProvider).ToList();
            return new PageOutput<RoleDTO>(pageIndex, pageSize, count, data);
        }
 
        public PageOutput<UserSelectRoleDTO> GetRoleListByPage(Guid userId, int pageIndex, int pageSize)
        {
            var query = from role in _roleRepository.GetAll()
                        join userRoleItem in _userRoleRepository.GetAll().Where(t => t.UserId == userId) on role.Id equals userRoleItem.RoleId into t
                        from userRole in t.DefaultIfEmpty()
                        select new UserSelectRoleDTO()
                        {
                            Id = role.Id,
                            IsSelect = userRole == null ? false : true,
                            RoleDescription = role.RoleDescription,
                            RoleName = role.RoleName
                        };
            var count = _roleRepository.GetCount();
            var data = query.ToList();
            return new PageOutput<UserSelectRoleDTO>(pageIndex, pageSize, count, data);
        }

        public IResponseOutput UpdateUserRole(Guid userId, Guid roleId, bool isSelect)
        {
            var success = false;
            if (isSelect)
            {
                _userRoleRepository.Add(new UserRole()
                {
                    RoleId = roleId,
                    UserId = userId
                });
                success = _userRoleRepository.SaveChanges();
            }
            else
            {
                success = _userRoleRepository.Delete(t => t.UserId == userId && t.RoleId == roleId);
            }

            return ResponseOutput.Result(success);

        }
    }
}