using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using iPackage.Core.Web.Models.Entity;
using iPackage.Core.Web.Models.Settings;
using iPackage.Core.Web.Services.Contracts;
using iPackage.Extensions;
using Microsoft.AspNetCore.Identity;
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;

namespace iPackage.Core.Web.Services
{

    public class DbService : IDbService
    {
        private readonly ApplicationIdentityContext _context;
        private readonly IOptionsSnapshot<SiteSettings> _adminUserSeedOptions;

        public DbService(
            ApplicationIdentityContext context,
            IOptionsSnapshot<SiteSettings> adminUserSeedOptions)
        {
            _context = context;
            _adminUserSeedOptions = adminUserSeedOptions;
        }
        public void Initialize()
        {
            _context.Database.EnsureCreated();
            _context.Database.Migrate();
        }



        public string CreateBackUp()
        {
            var backUpName = $"{StringExtensions.GetId()}_{DateTime.Now.ToString(" yyyy-MM-dd HH-mm-ss")}.bak";
            var path = $"{Directory.GetCurrentDirectory()}/wwwroot/BackUps/{backUpName}";
            string commandText = $@"BACKUP DATABASE [iGarsonDB] TO DISK = N'{path}' WITH NOFORMAT, INIT, NAME = N'iGarsonDB-Full Database Backup', SKIP, NOREWIND, NOUNLOAD,  STATS = 10";

            SqlConnectionStringBuilder connectionStringBuilder = new SqlConnectionStringBuilder
            {
                DataSource = ".",
                InitialCatalog = "iGarsonDB",
                IntegratedSecurity = true
            };
            using (SqlConnection connection = new SqlConnection(connectionStringBuilder.ConnectionString))
            {
                connection.Open();
                using (SqlCommand command = connection.CreateCommand())
                {
                    command.CommandText = commandText;
                    command.CommandType = CommandType.Text;
                    command.ExecuteNonQuery();
                }
            }

            return backUpName;
        }

        public List<string> GetBackUps()
        {
            var files = Directory.GetFiles($"{Directory.GetCurrentDirectory()}/wwwroot/BackUps");
            return files.Select(f => f.Split('\\').Last()).ToList();
        }

        public bool RestoreBackUp(string backUpId)
        {
            var files = Directory.GetFiles($"{Directory.GetCurrentDirectory()}/wwwroot/BackUps");
            string backUpName = string.Empty;
            foreach (var file in files)
            {
                if (file.Contains(backUpId))
                    backUpName = file;
            }
            if (string.IsNullOrEmpty(backUpName))
                return false;

            var databaseName = "iGarsonDB";
            var path = backUpName;
            string commandText = $@"USE [master];
                                    ALTER DATABASE [{databaseName}] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
                                    RESTORE DATABASE [{databaseName}] FROM DISK = N'{path}' WITH FILE = 1, NOUNLOAD, REPLACE, STATS = 5;
                                    ALTER DATABASE [{databaseName}] SET MULTI_USER;";

            SqlConnectionStringBuilder connectionStringBuilder = new SqlConnectionStringBuilder
            {
                DataSource = ".",
                InitialCatalog = "iGarsonDB",
                IntegratedSecurity = true
            };
            using (SqlConnection connection = new SqlConnection(connectionStringBuilder.ConnectionString))
            {
                connection.Open();
                using (SqlCommand command = connection.CreateCommand())
                {
                    command.CommandText = commandText;
                    command.CommandType = CommandType.Text;
                    command.ExecuteNonQuery();
                }
            }
            return true;
        }

        public bool RemoveBackUp(string backUpId)
        {
            var files = Directory.GetFiles($"{Directory.GetCurrentDirectory()}/wwwroot/BackUps");
            string backUpName = string.Empty;
            foreach (var file in files)
            {
                if (file.Contains(backUpId))
                    backUpName = file;
            }
            if (string.IsNullOrEmpty(backUpName))
                return false;
            var path = backUpName;
            File.Delete(path);
            return true;
        }
    }
}