using System.Text.RegularExpressions;

namespace YLErp.Modules.AppModule
{
    /// <summary>
    /// 邮件模板服务
    /// </summary>
    public class EmailTemplateService : YLBaseService
    {
        public EmailTemplateService(OptUserInfo userInfo) : base(userInfo)
        {

        }

        public EmailTemplateService(YLBaseService baseService) : base(baseService)
        {
        }

        public EmailTemplate GetData(string emailType)
        {
            return DbContext.EmailTemplate.AsNoTracking().FirstOrDefault(n => n.EmailType == emailType);
        }

        /// <summary>
        /// 保存数据
        /// </summary>
        public virtual int SaveData(EmailTemplate data)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }

            if (string.IsNullOrWhiteSpace(data.EmailType))
            {
                throw new ServiceException("缺少邮件类型");
            }

            var dbmodel = DbContext.EmailTemplate.FirstOrDefault(n => n.EmailType == data.EmailType);

            if (dbmodel == null)
            {
                DbContext.EmailTemplate.Add(dbmodel = new EmailTemplate());
            }

            UpdateChanges(dbmodel, data, "id");

            return DbContext.SaveChanges();
        }

        /// <summary>
        /// 生成邮件信息，如果从数据库中取不到模板配置，返回null
        /// </summary>
        public MailInfoResultModel GenerateMailInfo(string emailType, MailInfoRequestModel reqModel)
        {
            if (string.IsNullOrEmpty(emailType))
            {
                throw new ArgumentException("不能为空", nameof(emailType));
            }

            if (reqModel == null)
            {
                throw new ArgumentNullException(nameof(reqModel));
            }

            var template = DbContext.EmailTemplate.AsNoTracking().FirstOrDefault(n => n.EmailType == emailType);

            if (template == null)
            {
                return null;
            }

            return GenerateMailInfo(template, reqModel);
        }

        /// <summary>
        /// 生成邮件信息，如果template为null，返回null
        /// </summary>
        public static MailInfoResultModel GenerateMailInfo(EmailTemplate template, MailInfoRequestModel reqModel)
        {
            if (template is null)
            {
                return null;
            }

            if (reqModel == null)
            {
                throw new ArgumentNullException(nameof(reqModel));
            }

            string replace(Match m)
            {
                switch (m.Groups[1].Value)
                {
                    case "客户名称":
                        return reqModel.ClientName;
                    case "交易日期":
                        return reqModel.TradeDate;
                    case "文档编号":
                        return reqModel.DocNumber;
                    case "交易列表":
                        return reqModel.TradeList;
                }
                return string.Empty;
            }

            var pattern = @"\{\{(客户名称|交易日期|文档编号|交易列表)\}\}";

            var result = new MailInfoResultModel
            {
                IsBodyHtml = template.IsBodyHtml,
                Title = Regex.Replace(template.TitleTemplate, pattern, replace),
                Body = Regex.Replace(template.BodyTemplate, pattern, replace)
            };

            return result;
        }
    }

    /// <summary>
    /// 邮件信息请求Model
    /// </summary>
    public class MailInfoRequestModel
    {
        /// <summary>
        /// {{客户名称}}
        /// </summary>
        public string ClientName { get; set; }

        /// <summary>
        /// {{交易日期}}
        /// </summary>
        public string TradeDate { get; set; }

        /// <summary>
        /// {{文档编号}}
        /// </summary>
        public string DocNumber { get; set; }

        /// <summary>
        /// {{交易列表}}
        /// </summary>
        public string TradeList { get; set; }
    }

    /// <summary>
    /// 邮件信息结果Model
    /// </summary>
    public class MailInfoResultModel
    {
        public string Title { get; set; } = string.Empty;

        public string Body { get; set; } = string.Empty;

        public bool IsBodyHtml { get; set; }
    }
}