using MailKit.Net.Smtp;
using MimeKit;
using MimeKit.Text;
using Rhea.Common;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tiger.Model;

namespace Tiger.Business
{
    /// <summary>
    /// 邮件信息
    /// </summary>
    public static class MailMessage
    {
        /// <summary>
        /// 组装邮件文本/附件邮件信息
        /// </summary>
        /// <param name="mailBodyEntity">邮件消息实体</param>
        /// <returns></returns>
        public static MimeMessage AssemblyMailMessage(MailBodyEntity mailBodyEntity)
        {
            if (mailBodyEntity == null)
            {
                throw new ArgumentNullException(nameof(mailBodyEntity));
            }

            var message = new MimeMessage();

            //设置邮件基本信息
            SetMailBaseMessage(message, mailBodyEntity);

            var multipart = new Multipart("mixed");

            //插入文本消息
            if (string.IsNullOrEmpty(mailBodyEntity.MailTextBody) == false)
            {
                var alternative = new MultipartAlternative
                {
                    AssemblyMailTextMessage(mailBodyEntity.MailTextBody, mailBodyEntity.MailBodyType)
                 };

                multipart.Add(alternative);
            }

            //插入附件
            if (mailBodyEntity.MailFilePath != null && File.Exists(mailBodyEntity.MailFilePath) == false)
            {
                var mimePart = AssemblyMailAttachmentMessage(mailBodyEntity.MailFileType, mailBodyEntity.MailFileSubType,
                     mailBodyEntity.MailFilePath);

                multipart.Add(mimePart);
            }

            //组合邮件内容
            message.Body = multipart;

            return message;
        }

        /// <summary>
        /// 设置邮件基础信息
        /// </summary>
        /// <param name="minMessag"></param>
        /// <param name="mailBodyEntity"></param>
        /// <returns></returns>
        public static MimeMessage SetMailBaseMessage(MimeMessage minMessag, MailBodyEntity mailBodyEntity)
        {
            if (minMessag == null)
            {
                throw new ArgumentNullException();
            }

            if (mailBodyEntity == null)
            {
                throw new ArgumentNullException();
            }

            //插入发件人
            minMessag.From.Add(new MailboxAddress(mailBodyEntity.Sender, mailBodyEntity.SenderAddress));

            //插入收件人
            foreach (var recipients in mailBodyEntity.Recipients)
            {
                minMessag.To.Add(new MailboxAddress(recipients, recipients));
            }

            //插入抄送人
            foreach (var cC in mailBodyEntity.Cc)
            {
                minMessag.Cc.Add(new MailboxAddress(cC, cC));
            }

            //插入主题
            minMessag.Subject = mailBodyEntity.Subject;

            return minMessag;
        }

        /// <summary>
        /// 组装邮件文本信息
        /// </summary>
        /// <param name="mailBody">邮件文本内容</param>
        /// <param name="textPartType">邮件文本类型(plain,html,rtf,xml)</param>
        /// <returns></returns>
        public static TextPart AssemblyMailTextMessage(string mailBody, string textPartType)
        {
            if (string.IsNullOrEmpty(mailBody))
            {
                throw new ArgumentNullException();
            }

            if (string.IsNullOrEmpty(textPartType))
            {
                throw new ArgumentNullException();
            }

            var textBody = new TextPart(textPartType)
            {
                Text = mailBody
            };

            return textBody;
        }

        /// <summary>
        /// 组装邮件附件信息
        /// </summary>
        /// <param name="fileAttachmentType">附件类型(image,application)</param>
        /// <param name="fileAttachmentSubType">附件子类型 </param>
        /// <param name="fileAttachmentPath">附件路径</param>
        /// <returns></returns>
        public static MimePart AssemblyMailAttachmentMessage(string fileAttachmentType, string fileAttachmentSubType, string fileAttachmentPath)
        {
            if (string.IsNullOrEmpty(fileAttachmentSubType))
            {
                throw new ArgumentNullException();
            }

            if (string.IsNullOrEmpty(fileAttachmentType))
            {
                throw new ArgumentNullException();
            }

            if (string.IsNullOrEmpty(fileAttachmentPath))
            {
                throw new ArgumentNullException();
            }

            var attachment = new MimePart(fileAttachmentType, fileAttachmentSubType)
            {
                Content = new MimeContent(File.OpenRead(fileAttachmentPath)),
                ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                ContentTransferEncoding = ContentEncoding.Base64,
                FileName = Path.GetFileName(fileAttachmentPath)
            };

            return attachment;
        }

    }
}