using System.Collections.Specialized;
using System.Text;
using YieldChain.Helpers;
using YLErp.DBModels.Consts;
using YLErp.MailKit;

namespace YLErp.Modules.AppModule
{
    /// <summary>
    /// 邮件发送配置处理
    /// </summary>
    class SmtpConfigHandler
    {
        readonly SmtpConfigExt _config;

        public SmtpConfigHandler(SmtpConfigExt config)
        {
            _config = config ?? throw new ArgumentNullException(nameof(config));
        }

        /// <summary>
        /// 重置邮件发送配置
        /// </summary>
        public void ResetConfig(string configText)
        {
            if (string.IsNullOrWhiteSpace(configText)) return;

            var arr = configText.Split(new[] { "[|]" }, StringSplitOptions.RemoveEmptyEntries);

            if (arr.Length < 1) return;

            var nv = UrlHelper.ParseQueryString(arr[0]) ?? new NameValueCollection();
            int.TryParse(nv["port"], out int port);
            _config.Server = nv["server"];
            _config.Port = port > 0 ? port : 25;
            _config.UserName = nv["userName"];
            _config.Password = nv["password"];
            _config.EnableSsl = "true".Equals(nv["enableSsl"], StringComparison.OrdinalIgnoreCase);
            _config.ZipAttach = "true".Equals(nv["zipAttach"], StringComparison.OrdinalIgnoreCase);
            _config.Receipt = "true".Equals(nv["receipt"], StringComparison.OrdinalIgnoreCase);

            if (arr.Length < 2) return;

            var otherUsers = new List<SmtpConfig>(arr.Length - 1);

            for (var i = 1; i < arr.Length; i++)
            {
                nv = UrlHelper.ParseQueryString(arr[i]);
                if (nv != null)
                {
                    otherUsers.Add(new SmtpConfig
                    {
                        UserName = nv["userName"],
                        Password = nv["password"],
                        Receipt = "true".Equals(nv["receipt"], StringComparison.OrdinalIgnoreCase)
                    });
                }
            }

            _config.OtherUsers = otherUsers.ToArray();
        }

        /// <summary>
        /// 重置邮件发送配置
        /// </summary>
        public void ResetConfig(SmtpConfigExt newConfig, bool saveIntoDB)
        {
            if (newConfig is null)
            {
                throw new ArgumentNullException(nameof(newConfig));
            }

            if (string.IsNullOrWhiteSpace(newConfig?.Server))
            {
                throw new ServiceException("主机不能为空");
            }

            if (string.IsNullOrWhiteSpace(newConfig.UserName) ||
                newConfig.OtherUsers != null && newConfig.OtherUsers.Any(n => string.IsNullOrWhiteSpace(n.UserName)))
            {
                throw new ServiceException("用户不能为空");
            }

            if (newConfig.OtherUsers != null && newConfig.OtherUsers.Count() + 1 !=
                newConfig.OtherUsers.Select(n => n.UserName.Trim()).Concat(new[] { newConfig.UserName.Trim() }).ToHashSet(StringComparer.OrdinalIgnoreCase).Count)
            {
                throw new ServiceException("用户不能重复");
            }

            if (saveIntoDB)
            {
                var sb = new StringBuilder(300);
                sb.Append("&server=").Append(newConfig.Server);
                sb.Append("&port=").Append(newConfig.Port);
                sb.Append("&userName=").Append(newConfig.UserName);
                sb.Append("&password=").Append(newConfig.Password);
                sb.Append("&enableSsl=").Append(newConfig.EnableSsl);
                sb.Append("&zipAttach=").Append(newConfig.ZipAttach);
                sb.Append("&receipt=").Append(newConfig.Receipt);

                if (newConfig.OtherUsers != null)
                {
                    foreach (var u in newConfig.OtherUsers)
                    {
                        sb.Append("[|]");
                        sb.Append("&userName=").Append(u.UserName);
                        sb.Append("&password=").Append(u.Password);
                        sb.Append("&receipt=").Append(u.Receipt);
                    }
                }

                var context = DbContextFactory.GetYLDbContext();
                var config = context.AppConfig.FirstOrDefault(n => n.PGroup == ConsAppConfig.ProjectConfig && n.PName == ConsAppConfig.SendMailConfig);
                if (config == null)
                {
                    config = new AppConfig
                    {
                        PGroup = ConsAppConfig.ProjectConfig,
                        PName = ConsAppConfig.SendMailConfig,
                        CreateTime = DateTime.Now,
                        PType = "string",
                        Remark = "邮件发送配置(格式:&server=192.168.1.1&port=25&userName=test@test.com&password=123456&enableSsl=false|true)"
                    };
                }
                config.PValue = sb.ToString();
                context.SaveChanges();
            }

            ObjectHelper.MapValues(_config, newConfig);
        }
    }
}