package com.fjhx.email.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.ObjectUtil;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.fjhx.email.config.exception.ServiceException;
import com.fjhx.email.entity.*;
import com.fjhx.email.entity.dto.GetMessagePageDto;
import com.fjhx.email.entity.dto.MailSyncInfo;
import com.fjhx.email.entity.dto.MailboxInfo;
import com.fjhx.email.entity.vo.MessageDetailVo;
import com.fjhx.email.entity.vo.MessageVo;
import com.fjhx.email.mapper.MailMapper;
import com.fjhx.email.service.*;
import com.fjhx.email.utils.EmailUtil;
import com.fjhx.email.utils.ObsFileUtil;
import com.fjhx.email.utils.PageWrapper;
import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.IMAPMessage;
import com.sun.mail.imap.IMAPStore;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.mail.*;
import javax.mail.internet.MimeUtility;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

@Slf4j
@Service
public class MailServiceImpl implements IMailService {

    @Autowired
    private MailMapper mailMapper;

    @Autowired
    private IPersonalMessageService personalMessageService;

    @Autowired
    private IEnterpriseMessageService enterpriseMessageService;

    @Autowired
    private IEnterpriseMessageAddressService enterpriseMessageAddressService;

    @Autowired
    private IEnterpriseMessageAttachmentService enterpriseMessageAttachmentService;

    @Autowired
    private IEnterpriseMessageContentService enterpriseMessageContentService;

    @Autowired
    private IPersonalMessageAddressService personalMessageAddressService;

    @Autowired
    private IPersonalMessageAttachmentService personalMessageAttachmentService;

    @Autowired
    private IPersonalMessageContentService personalMessageContentService;

    @Autowired
    private IPersonalMailboxService personalMailboxService;

    @Autowired
    private IEnterpriseMailboxService enterpriseMailboxService;

    @Autowired
    private IEnterpriseDomainService enterpriseDomainService;

    @Override
    public List<MailboxInfo> getMailboxInfoListByUserId(List<Long> userIdList) {
        return mailMapper.getMailboxInfoListByUserId(userIdList, MailSyncInfo.mailType);
    }

    @Override
    public PageWrapper<MessageVo> getMessagePage(GetMessagePageDto dto) {

        if (dto.getType().equals(1)) {
            Page<PersonalMessage> page = personalMessageService.page(dto, q -> q
                    .eq(PersonalMessage::getFolderId, dto.getFolderId())
                    .orderByDesc(PersonalMessage::getSendDate)
            );
            return new PageWrapper<>(page, MessageVo.class);
        }

        Page<EnterpriseMessage> page = enterpriseMessageService.page(dto, q -> q
                .eq(EnterpriseMessage::getFolderId, dto.getFolderId())
                .orderByDesc(EnterpriseMessage::getSendDate)
        );
        return new PageWrapper<>(page, MessageVo.class);
    }

    @SneakyThrows
    @Override
    public MessageDetailVo getMessageDetail(GetMessagePageDto dto) {
        Long messageId = dto.getMessageId();

        Integer contentSync;
        Integer addressSync;
        Integer attachmentSync;

        Integer messageNumber;

        String folderName;
        Long mailboxId;

        if (dto.getType().equals(1)) {
            PersonalMessage personalMessage = personalMessageService.getById(messageId);
            if (personalMessage == null) {
                throw new ServiceException("没有找到邮箱");
            }
            messageNumber = personalMessage.getMessageNumber();
            contentSync = personalMessage.getContentSync();
            addressSync = personalMessage.getAddressSync();
            attachmentSync = personalMessage.getAttachmentSync();

            folderName = personalMessage.getFolderName();
            mailboxId = personalMessage.getMailboxId();
        } else {
            EnterpriseMessage enterpriseMessage = enterpriseMessageService.getById(messageId);
            if (enterpriseMessage == null) {
                throw new ServiceException("没有找到邮箱");
            }
            messageNumber = enterpriseMessage.getMessageNumber();
            contentSync = enterpriseMessage.getContentSync();
            addressSync = enterpriseMessage.getAddressSync();
            attachmentSync = enterpriseMessage.getAttachmentSync();

            folderName = enterpriseMessage.getFolderName();
            mailboxId = enterpriseMessage.getMailboxId();
        }

        MessageDetailVo messageDetailVo = new MessageDetailVo();

        // 正文附件已同步
        if (contentSync == 1 && addressSync == 1 && attachmentSync == 1) {
            if (dto.getType().equals(1)) {
                setPersonalMessageDetailVo(messageDetailVo, messageId);
            } else {
                setEnterpriseMessageDetailVo(messageDetailVo, messageId);
            }
        }
        // 未同步
        else {

            MailboxInfo mailboxInfo = getMailboxInfo(dto.getType(), mailboxId);

            IMAPStore imapStore = EmailUtil.getIMAPStore(mailboxInfo);
            IMAPFolder folder = (IMAPFolder) imapStore.getFolder(folderName);
            folder.open(Folder.READ_ONLY);
            IMAPMessage message = (IMAPMessage) folder.getMessage(messageNumber);

            messageDetailVo.setMessageAttachmentList(new ArrayList<>());
            getMessageAndAttachment(messageDetailVo, message, messageId);

            messageDetailVo.setMessageAddressList(EmailUtil.mailAddressList(message));

        }

        for (MessageDetailVo.MessageAttachment messageAttachment : messageDetailVo.getMessageAttachmentList()) {
            messageAttachment.setUrl(ObsFileUtil.getCompleteUrl(messageAttachment.getUrl()));
        }

        return messageDetailVo;
    }

    private MailboxInfo getMailboxInfo(Integer type, Long mailboxId) {
        MailboxInfo mailboxInfo = new MailboxInfo();


        if (type.equals(1)) {
            PersonalMailbox personalMailbox = personalMailboxService.getById(mailboxId);
            mailboxInfo.setReceiveHost(personalMailbox.getReceiveHost());
            mailboxInfo.setReceivePort(personalMailbox.getReceivePort());
            mailboxInfo.setMailUser(personalMailbox.getMailUser());
            mailboxInfo.setMailPassword(personalMailbox.getMailPassword());

            return mailboxInfo;
        }

        EnterpriseMailbox enterpriseMailbox = enterpriseMailboxService.getById(mailboxId);
        EnterpriseDomain enterpriseDomain = enterpriseDomainService.getById(enterpriseMailbox.getDomainId());
        mailboxInfo.setReceiveHost(enterpriseDomain.getReceiveHost());
        mailboxInfo.setReceivePort(enterpriseDomain.getReceivePort());
        mailboxInfo.setMailUser(enterpriseMailbox.getMailUserPrefix() + "@" + enterpriseDomain.getDomanName());
        mailboxInfo.setMailPassword(enterpriseMailbox.getMailPassword());
        return mailboxInfo;
    }


    private void setPersonalMessageDetailVo(MessageDetailVo vo, Long messageId) {
        List<PersonalMessageAddress> addressList = personalMessageAddressService.list(
                q -> q.eq(PersonalMessageAddress::getMessageId, messageId));
        vo.setMessageAddressList(BeanUtil.copyToList(addressList, MessageDetailVo.MessageAddress.class));

        List<PersonalMessageAttachment> attachmentList = personalMessageAttachmentService.list(
                q -> q.eq(PersonalMessageAttachment::getMessageId, messageId));
        vo.setMessageAttachmentList(BeanUtil.copyToList(attachmentList, MessageDetailVo.MessageAttachment.class));

        PersonalMessageContent content = personalMessageContentService.getOne(
                q -> q.eq(PersonalMessageContent::getMessageId, messageId));
        vo.setContent(content.getContent());
    }

    private void setEnterpriseMessageDetailVo(MessageDetailVo vo, Long messageId) {
        List<EnterpriseMessageAddress> addressList = enterpriseMessageAddressService.list(
                q -> q.eq(EnterpriseMessageAddress::getMessageId, messageId));
        vo.setMessageAddressList(BeanUtil.copyToList(addressList, MessageDetailVo.MessageAddress.class));

        List<EnterpriseMessageAttachment> attachmentList = enterpriseMessageAttachmentService.list(
                q -> q.eq(EnterpriseMessageAttachment::getMessageId, messageId));
        vo.setMessageAttachmentList(BeanUtil.copyToList(attachmentList, MessageDetailVo.MessageAttachment.class));

        EnterpriseMessageContent content = enterpriseMessageContentService.getOne(
                q -> q.eq(EnterpriseMessageContent::getMessageId, messageId));
        vo.setContent(content.getContent());
    }

    /**
     * 保存附件和正文
     */
    private void getMessageAndAttachment(MessageDetailVo messageDetailVo, Part part, Long messageId)
            throws MessagingException, IOException {

        // 正文：文本格式
        if (part.isMimeType("text/plain")) {
            addPlain(part, messageDetailVo);
        }

        // 正文：html格式
        else if (part.isMimeType("text/html")) {
            addHtml(part, messageDetailVo);
        }

        // 正文：html格式
        else if (part.isMimeType("text/html; charset=UTF-8")) {
            addHtmlUtf8(part, messageDetailVo);
        }

        // 大对象
        else if (part.isMimeType("multipart/*")) {

            // 复杂体邮件
            Multipart multipart = (Multipart) part.getContent();

            // 复杂体邮件包含多个邮件体
            int partCount = multipart.getCount();

            for (int i = 0; i < partCount; i++) {

                // 获得复杂体邮件中其中一个邮件体
                BodyPart bodyPart = multipart.getBodyPart(i);

                // 某一个邮件体也有可能是由多个邮件体组成的复杂体
                String disposition = bodyPart.getDisposition();

                // 正文：html格式
                if (bodyPart.isMimeType("text/html")) {
                    addHtml(bodyPart, messageDetailVo);
                }

                // 正文：文本格式
                if (bodyPart.isMimeType("text/plain")) {
                    addPlain(bodyPart, messageDetailVo);
                }

                // 正文：html格式
                else if (part.isMimeType("text/html; charset=UTF-8")) {
                    addHtmlUtf8(part, messageDetailVo);
                }

                // 附件
                else if (disposition != null
                        && (disposition.equalsIgnoreCase(Part.ATTACHMENT) || disposition.equalsIgnoreCase(Part.INLINE))) {
                    MessageDetailVo.MessageAttachment messageAttachment = getMessageAttachment(bodyPart);
                    messageDetailVo.getMessageAttachmentList().add(messageAttachment);
                }

                // 大对象
                else if (bodyPart.isMimeType("multipart/*")) {
                    getMessageAndAttachment(messageDetailVo, bodyPart, messageId);
                }

                // 其他类型
                else {
                    String contentType = bodyPart.getContentType();
                    if (contentType.contains("name") || contentType.contains("application")) {
                        MessageDetailVo.MessageAttachment messageAttachment = getMessageAttachment(bodyPart);
                        messageDetailVo.getMessageAttachmentList().add(messageAttachment);
                    } else {
                        if (!contentType.equals("text/html; charset=UTF-8"))
                            log.error("未知文件格式：{} ，邮件id：{}，待解析", contentType, messageId);
                    }
                }

            }
        }

        // rfc822
        else if (part.isMimeType("message/rfc822")) {
            getMessageAndAttachment(messageDetailVo, (Part) part.getContent(), messageId);
        }

        // 未知格式
        else {
            log.error("未知文件格式：{} ，邮件id：{}，待解析", part.getContentType(), messageId);
        }

    }

    private MessageDetailVo.MessageAttachment getMessageAttachment(Part part)
            throws MessagingException, IOException {

        InputStream is = part.getInputStream();
        String fileName = decodeText(part.getFileName());

        String url = ObsFileUtil.uploadFile(fileName, is);

        MessageDetailVo.MessageAttachment messageAttachment = new MessageDetailVo.MessageAttachment();
        messageAttachment.setUrl(url);
        messageAttachment.setName(fileName);
        return messageAttachment;
    }

    private void addHtml(Part part, MessageDetailVo messageDetailVo) throws MessagingException, IOException {
        Object content = part.getContent();
        if (content != null) {
            messageDetailVo.setContent(content.toString());
        } else {
            messageDetailVo.setContent(StringPool.EMPTY);
        }
        messageDetailVo.setMimeType("text/html");
    }

    private void addHtmlUtf8(Part part, MessageDetailVo messageDetailVo) throws MessagingException, IOException {
        Object content = part.getContent();
        if (content != null) {
            messageDetailVo.setContent(content.toString());
        } else {
            messageDetailVo.setContent(StringPool.EMPTY);
        }
        messageDetailVo.setMimeType("text/html; charset=UTF-8");
    }

    private void addPlain(Part part, MessageDetailVo messageDetailVo) throws MessagingException, IOException {
        Object content = part.getContent();
        if (content != null) {
            if (ObjectUtil.notEqual(messageDetailVo.getMimeType(), "text/html")) {
                messageDetailVo.setContent(content.toString());
                messageDetailVo.setMimeType("text/plain");
            }
        }
    }

    /**
     * 文本解码
     */
    private String decodeText(String encodeText) throws UnsupportedEncodingException {
        if (encodeText == null || StringPool.EMPTY.equals(encodeText)) {
            return StringPool.EMPTY;
        } else {
            return MimeUtility.decodeText(encodeText);
        }
    }

    // /**
    //  * 上传文件
    //  */
    // private String uploadFile(InputStream is, String fileName) {
    //
    //     BufferedInputStream bis = new BufferedInputStream(is);
    //     ByteArrayOutputStream baos = new ByteArrayOutputStream();
    //     BufferedOutputStream bos = new BufferedOutputStream(baos);
    //
    //     try {
    //         int len;
    //
    //         while ((len = bis.read()) != -1) {
    //             bos.write(len);
    //             bos.flush();
    //         }
    //
    //         bos.write(is.read());
    //
    //         // 上次附件至华为云
    //         ObsUpload obsUpload = new ObsUpload();
    //         obsUpload.setFileName(fileName);
    //         obsUpload.setBytes(baos.toByteArray());
    //         R<JSONObject> jsonObjectR = obsClient.uploadHuaWei(obsUpload);
    //         if (jsonObjectR.isSuccess()) {
    //             JSONObject data = jsonObjectR.getData();
    //             return data.getString("path");
    //         }
    //     } catch (Exception e) {
    //         log.error("上传文件出错", e);
    //         throw new ServiceException("获取附件出现错误");
    //     } finally {
    //         IoUtil.close(bos);
    //         IoUtil.close(baos);
    //         IoUtil.close(bis);
    //         IoUtil.close(is);
    //     }
    //     return null;
    // }

}