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/*

 * Copyright (C) 2021 by Andreas Theofilu <andreas@theosys.at>

 *

 * 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

 */

#ifndef __THTTPCLIENT_H__

#define __THTTPCLIENT_H__

#include <string>

#include <netdb.h>

#include <openssl/ssl.h>

typedef enum METHOD_t

{

    UNSUPPORTED,

    GET,

    PUT,

    POST,

    HEAD

}METHOD_t;

typedef struct URL_t

{

    std::string scheme;

    std::string host;

    int port{0};

    std::string path;

    std::string user;

    std::string pw;

    void clear()

    {

        scheme.clear();

        host.clear();

        port = 0;

        path.clear();

        user.clear();

        pw.clear();

    }

}URL_t;

typedef struct HTTPHEAD_t

{

    std::string name;

    std::string content;

}HTTPHEAD_t;

typedef struct HTTPBODY_t

{

    char *body{nullptr};

    size_t len{0};

    void clear()

    {

        if (body != nullptr)

            delete[] body;

        body = nullptr;

        len = 0;

    }

}HTTPBODY_t;

typedef struct HTTPREQUEST_t

{

    METHOD_t method{UNSUPPORTED};

    int direction{0};

    int code{0};            // on receive

    char *status{nullptr};  // on receive

    char *path{nullptr};

    char *version{nullptr};

    void clear()

    {

        direction = 0;

        code = 0;

        method = UNSUPPORTED;

        if (status != nullptr)

            delete[] status;

        status = nullptr;

        if (path != nullptr)

            delete[] path;

        path = nullptr;

        if (version != nullptr)

            delete[] version;

        version = nullptr;

    }

}HTTPREQUEST_t;

class THTTPClient

{

    public:

        THTTPClient();

        ~THTTPClient();

        char *tcall(size_t *size, const std::string& URL, const std::string& user, const std::string& pw);

        std::string makeURL(const std::string& scheme, const std::string& host, int port, const std::string& path);

        char *getContent(const char *buffer);

        char *getContent() { return mBody.body; }

        size_t getContentSize() { return mBody.len; }

    protected:

        URL_t& parseURL(const std::string& URL);

        int socket_connect();

        std::string getSocketError(int err, const std::string data);

        void initSSL();

        SSL_CTX *initCTX();

        void log_ssl_error();

        int sockWrite(int fd, char *buffer, size_t len);

        int sockRead(int fd, char *buffer, size_t len);

        int parseHeader(const char *buffer, size_t len);

        std::string getHeadParameter(const std::string& name);

        std::string makeRequest(const std::string& url);

        struct addrinfo *lookup_host (const std::string& host, int port);

        int input_timeout (int filedes, unsigned int seconds);

    private:

        URL_t mURL;

        bool mSSLInitialized{false};

        SSL_CTX *mCtx{nullptr};

        SSL *mSsl{nullptr};

        std::string mUser;

        std::string mPassword;

        std::vector<HTTPHEAD_t> mHeader;

        HTTPBODY_t mBody;

        HTTPREQUEST_t mRequest;

};

#endif