/*
 * Copyright (C) 2017 Light's Hope <https://lightshope.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "SendgridMail.h"
#include "Config/Config.h"
#include "json.hpp"
#include <curl/curl.h>
#include <utility>

using json = nlohmann::json;

void SendgridMail::substitution(const std::string& key, const std::string& value)
{
 _substitutions[key] = value;
 //_substitutions.insert_or_assign(key, value);
}

void SendgridMail::recipient(std::string recipient)
{
 _recipients.emplace_back(std::move(recipient));
}

void SendgridMail::from(std::string from)
{
 _from = std::move(from);
}

SendgridMail::Result SendgridMail::send()
{
 if (_recipients.empty())
 {
 return Result::RECIPIENT_MISSING;
 }

 if (_from.empty())
 {
 return Result::FROM_MISSING;
 }

 CURL* curl = curl_easy_init();

 if (!curl)
 {
 return Result::INTERNAL_ERROR;
 }

 //curl_easy_setopt(curl, CURLOPT_URL, uri.data());
 curl_easy_setopt(curl, CURLOPT_URL, uri);

 // add header data
 curl_slist* list = nullptr;
 const std::string auth = std::string("authorization: Bearer ") + _api_key;
 list = curl_slist_append(list, auth.c_str());
 list = curl_slist_append(list, "Content-Type: application/json");
 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
 
 if (sConfig.GetBoolDefault("MailCertChecks", true))
 {
 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 }

 json data
 {
 { "template_id", _template_name },
 { "from", {{ "email", _from }}},
 { "personalizations",
 {
 {{ "to", {{
 { "email", _recipients.front() } // only dealing with a single recipient for now
 }}},
 { "substitutions",
 _substitutions
 } },
 },
 }
 };

 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data.dump().c_str());

 _extended_error = curl_easy_perform(curl); // shouldn't really use int here

 curl_slist_free_all(list);
 curl_easy_cleanup(curl);
 return _extended_error == CURLE_OK? Result::OK : Result::EXTENDED_ERROR;
}

SendgridMail::ExResult SendgridMail::extended_error() const
{
 return _extended_error;
}