//
//  main.cpp
//  FTP
//
//  Created by Saxon Nicholls on 4/7/19.
//  Copyright © 2019 Saxon Nicholls. All rights reserved.
//

#include <iostream>
#include <curl/curl.h>

// https://curl.haxx.se/libcurl/c/ftpget.html

class FTP {
public:
    
    struct FtpFile {
        const char *filename;
        FILE *stream;
    };
    
    CURL *curl{nullptr};
    CURLcode res;
    
    std::string url;    // ftp location that we are downloading from
    std::string file_name;

public:
    FTP( const std::string& myurl="ftp://<username>:<password>@hosted.datascope.reuters.com/reports/ASXPriceHistory20190703.csv", const std::string& myfile_name="/Development/FTP/FTP/ASXPriceHistory20190703.csv") : url{ myurl }, file_name{ myfile_name } {};
    virtual ~FTP() {};
    
    virtual void Instantiate() {
        if ( url.empty() || file_name.empty() ) return;
        
        struct FtpFile ftpfile = {
            file_name.c_str(), /* name to store the file as if successful */
            NULL
        };
        
        curl_global_init(CURL_GLOBAL_DEFAULT);
        
        curl = curl_easy_init();
        if(curl) {
            /*
             * You better replace the URL with one that works!
             */
            curl_easy_setopt(curl, CURLOPT_URL, url.c_str() );
            
            /* Define our callback to get called when there's data to be written */
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
            
            /* Set a pointer to our struct to pass to the callback */
            curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile);
            
            /* Switch on full protocol/debug output */
            curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
            
            res = curl_easy_perform(curl);
            
            /* always cleanup */
            curl_easy_cleanup(curl);
            
            if(CURLE_OK != res) {
                /* we failed */
                fprintf(stderr, "curl told us %d\n", res);
            }
        }
        
        if(ftpfile.stream) fclose(ftpfile.stream); /* close the local file */
        
        curl_global_cleanup();
        
        
    };
    
    static size_t my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream)
    {
        struct FtpFile *out = (struct FtpFile *)stream;
        if(!out->stream) {
            /* open file for writing */
            out->stream = fopen(out->filename, "wb");
            if(!out->stream)
                return -1; /* failure, can't open file to write */
        }
        return fwrite(buffer, size, nmemb, out->stream);
    }
    
};


int main(int argc, const char * argv[]) {
    
    FTP ftp;
    ftp.Instantiate();
    
    return 0;
}



*   Trying 192.165.219.225...
* TCP_NODELAY set
* Connected to hosted.datascope.reuters.com (192.165.219.225) port 21 (#0)
< 220 ProFTPD 1.3.3g Server ready.
> USER <username>
< 331 Password required for <username>
> PASS <password>
< 230 User <username> logged in
> PWD
< 257 "/" is the current directory
* Entry path is '/'
> CWD reports
* ftp_perform ends with SECONDARY: 0
< 250 CWD command successful
> EPSV
* Connect data stream passively
< 229 Entering Extended Passive Mode (|||49128|)
*   Trying 192.165.219.225...
* TCP_NODELAY set
* Connecting to 192.165.219.225 (192.165.219.225) port 49128
* Connection failed
* connect to 192.165.219.225 port 21 failed: Operation timed out
* Failed to connect to hosted.datascope.reuters.com port 21: Operation timed out
* Failed EPSV attempt. Disabling EPSV
> PASV
< 227 Entering Passive Mode (192,165,219,225,210,106)
*   Trying 192.165.219.225...
* TCP_NODELAY set
* Connecting to 192.165.219.225 (192.165.219.225) port 53866
* Connected to hosted.datascope.reuters.com (192.165.219.225) port 21 (#0)
> TYPE I
< 200 Type set to I
> SIZE ASXPriceHistory20190703.csv
< 213 5473307
> RETR ASXPriceHistory20190703.csv
< 150 Opening BINARY mode data connection for ASXPriceHistory20190703.csv (5473307 bytes)
* Maxdownload = -1
* Getting file with size: 5473307
* Remembering we are in dir "reports/"
< 226 Transfer complete
* Connection #0 to host hosted.datascope.reuters.com left intact