/*******************************************************************************
 * Copyright (c) 2024, Jan Koester jan.koester@gmx.net
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 * Neither the name of the <organization> nor the
 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************/

#include <string>
#include <vector>
#include <queue>
#include <mutex>
#include <condition_variable>
#include <thread>
#include <atomic>
#include <variant>

#include <httppp/http.h>
#include <json-c/json.h>

#pragma once

namespace blogi {

    struct MailAttachment {
        std::string filePath;
        std::string displayName;
        std::string contentId;
    };

    class SmtpSettings{
    private:
        std::string _SHost;
        std::string _SUser;
        std::string _SPass;
        std::string _Sender;
        int _SPort;
        friend class Blogi;
        friend class MailQueue;
    };

    class MailQueue {
    public:
        static constexpr size_t MAX_QUEUE_SIZE = 100;

        MailQueue();
        ~MailQueue();

        MailQueue(const MailQueue&) = delete;
        MailQueue& operator=(const MailQueue&) = delete;

        bool sendMail(SmtpSettings *settings, const char *receiver,
                      const char *subject, const std::string &message);

        bool sendHtmlMail(SmtpSettings *settings, const char *receiver,
                          const char *subject, const std::string &htmlBody,
                          const std::vector<MailAttachment> &attachments={});

    private:
        struct PlainMail {
            std::string host, user, pass, sender;
            int port;
            std::string receiver, subject, message;
        };

        struct HtmlMail {
            std::string host, user, pass, sender;
            int port;
            std::string receiver, subject, htmlBody;
            std::vector<MailAttachment> attachments;
        };

        using MailJob = std::variant<PlainMail, HtmlMail>;

        void _worker();
        static void _doSendPlain(const PlainMail &job);
        static void _doSendHtml(const HtmlMail &job);

        std::queue<MailJob>      _queue;
        std::mutex               _mutex;
        std::condition_variable  _cv;
        std::atomic<bool>        _stop{false};
        std::thread              _thread;
    };

    json_object* SettingsMail(dbpp::Database &db,libhttppp::HttpRequest &req,const std::string &sessionid);
    void sendMail(SmtpSettings *stmpsettings,const char *reciver,const char *subject,const std::string &mesg);
    void sendHtmlMail(SmtpSettings *stmpsettings,const char *reciver,const char *subject,
                      const std::string &htmlBody,const std::vector<MailAttachment> &attachments={});

};
