using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;
using DataModels;
using LinqToDB;
using LinqToDB.Data;

namespace UserService.DatabaseLayer.Repositories
{
    public class UsersRepository : IUsersRepository
    {
        public UsersRepository()
        {
            DataConnection.DefaultSettings = new MySettings();

        }

        /// <inheritdoc />
        public async Task<IReadOnlyList<User>> GetAllAsync(Expression<Func<User, bool>>? predicate = null,
            CancellationToken token = default)
        {
            await using var db = new UserServiceDB();
            return await db.Users.LoadWith(x=> x.Member).LoadWith(x=> x.Member.Node).WhereOrDefault(predicate).ToListAsync(token: token).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async Task<User?> GetAsync(Expression<Func<User, bool>> predicate, CancellationToken token = default)
        {
            await using var db = new UserServiceDB();
            var result = await db.Users.FirstOrDefaultAsync(predicate, token: token).ConfigureAwait(false);
            return result;
        }

        /// <inheritdoc />
        public async Task AddAsync(User entity, CancellationToken token = default)
        {
            await using var db = new UserServiceDB();
            var nodeId =
                await db.Nodes.InsertWithInt32IdentityAsync(() => new Node {CommonName = "holger"}, token: token);
            await db.Members.InsertAsync(() => new Member {Id = nodeId}, token: token);

            await db.Users.InsertAsync(() => new User
            {
                Id = nodeId,
                FirstName = entity.FirstName,
                LastName = entity.LastName,
                IsActive = entity.IsActive

            }, token: token).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public async Task<bool> UpdateAsync(User entity, CancellationToken token = default)
        {
            throw new NotImplementedException();
        }

        /// <inheritdoc />
        public async Task DeleteAsync(User entity, CancellationToken token = default)
        {
            await using var db = new UserServiceDB();
            await db.Users.DeleteAsync(x => x.Id == entity.Id, token: token);
        }
    }
}