/*

  Copyright 2009 Nathan Phillip Brink, Ethan Zonca, Matthew Orlando

  This file is a part of DistRen.

  DistRen is free software: you can redistribute it and/or modify

  it under the terms of the GNU Affero General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  DistRen 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License

  along with DistRen.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "distrenjob.h"

#include "slavefuncs.h"

#include "common/asprintf.h"

#include "common/execio.h"

#include "common/protocol.h"

#include "common/remoteio.h"

#include <curl/curl.h>

#include <curl/easy.h>

#include <curl/types.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <fcntl.h>

/**

   Sends the server a single request (see protocol.h)

*/

int sendSignal(struct remoteio *rem, char signal)

{

  size_t written;

  size_t towrite;

  char *ssignal;

  _distren_asprintf(&ssignal, "%c", signal);

  towrite = strlen(ssignal);

  while( towrite

	 && !remoteio_write(rem, ssignal, towrite, &written))

    {

      fprintf(stderr, "Sending request...\n");

      towrite -= written;

    }

  if(written)

    return 0;

  /**

     if remoteio_write returned 1, the connection

     is probably dead or there was a real error

   */

  return 1;

}

/**

   Sends the server an extended signal (request + data)

*/

int sendExtSignal(struct remoteio *rem, char signal, char *data){

  size_t written;

  size_t towrite;

  char *ssignal;

  _distren_asprintf(&ssignal, "%c%s", signal, data); // Just append the data FIXME: We should do this differently

  towrite = strlen(ssignal);

  while( towrite

          && !remoteio_write(rem, ssignal, towrite, &written))

     {

       fprintf(stderr, "Sending request...\n");

       towrite -= written;

     }

   if(written)

     return 0;

   /**

      if remoteio_write returned 1, the connection

      is probably dead or there was a real error

    */

   return 1;

}

/**

   Grabs the xml DOM node reached by an XPath.

   @param path an XPath that lead to DOM node

   @return the first node associated with the path or NULL if there is no match

 */

xmlNodePtr xml_quickxpath(xmlXPathContextPtr xpathctxt, xmlChar *path)

{

  xmlNodePtr toreturn;

  xmlXPathObjectPtr xmlxpathobjptr;

  xmlxpathobjptr = xmlXPathEval(path, xpathctxt);

  if(!xmlxpathobjptr

     || !xmlxpathobjptr->nodesetval->nodeNr)

    {

      fprintf(stderr, "XPath resolution failed for ``%s'' in ``%s'' (``%s'')\n", path, xpathctxt->doc->name, xpathctxt->doc->URL);

      return (xmlNodePtr)NULL;

    }

  toreturn = *(xmlxpathobjptr->nodesetval->nodeTab);

  xmlXPathFreeObject(xmlxpathobjptr);

  return toreturn;

}

/** Stub for deleting job data from the disk. @TODO: unstubify me! */

int delete_jobdata(int jobnum, char *datadir)

{

  char *jobpath;

  _distren_asprintf(&jobpath, "%s/%d", datadir, jobnum);

  // rmdir(jobpath);

  fprintf(stderr, "Please manually remove %s. Automatic removal is currently not implemented.\n", jobpath);

  return 0;

}

/** Function referenced by curlget() to write data to disk. */

size_t curl_writetodisk(void *ptr, size_t size, size_t nmemb, FILE *stream)

 {

    return fwrite(ptr, size, nmemb, stream);

  }

/** Helper function for cURL's progress display */

int curl_progress( char *Bar,double t,double d,double ultotal,double ulnow)

{

fprintf(stderr,"Downloading: %f%% complete\r",d/t*100);

return 0;

}

/** Retrieves a URL with cURL and saves it to disk */

int curlget(char *url, char *out){

  fprintf(stderr,"Preparing to download %s",url);

  double *Bar; // Stores cURL progress display info

  CURL *curl;

  CURLcode res;

  FILE *outfile;

  curl = curl_easy_init();

  if(curl) {

	outfile = fopen(out, "w"); // Open where we're writing to

  curl_easy_setopt(curl, CURLOPT_URL, url);

  curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);

  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_writetodisk); // this MUST be set for win32 compat.

  curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0);

  curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, curl_progress);

  curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &Bar);

  res = curl_easy_perform(curl);

  curl_easy_cleanup(curl);

  }

  fprintf(stderr,"\n"); // Clears out he progressbar's carriage return

  return res; // 0 is OK, 1 is 404 or other error

}

/** Posts a file to a url with cUrl */

int curlpost(char *filename, char *url){

  char *targetname = "uploadedfile"; // Name of the target in the php file on the server (Don't change me unless you have different PHP code)

  CURL *curl;

  CURLcode res;

  struct curl_httppost *formpost=NULL;

  struct curl_httppost *lastptr=NULL;

  struct curl_slist *headerlist=NULL;

  static const char buf[] = "Expect:";

  curl_global_init(CURL_GLOBAL_ALL);

  /* upload field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, targetname,

               CURLFORM_FILE, filename,

               CURLFORM_END);

  /* filename field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "filename",

               CURLFORM_COPYCONTENTS, filename,

               CURLFORM_END);

  /* submit field, not usually needed, just in case... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "submit",

               CURLFORM_COPYCONTENTS, "send",

               CURLFORM_END);

  curl = curl_easy_init();

  headerlist = curl_slist_append(headerlist, buf);

  if(curl) {

    /* Setting the URL to get the post, and the contents of the post */

    curl_easy_setopt(curl, CURLOPT_URL, url);

    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);

    /* cleanup the formpost junk */

    curl_formfree(formpost);

    curl_slist_free_all (headerlist);

  }

  return res;

}

/** Logs the user into the server after ensuring that keys exist */

int login_user(char *username)

{

  // @TODO: Put some telnet-style auth code here unless this is obselete

  return 1; // success

}

/** Replaces wordtoreplace with replacewith in conffile (relative to SYSCONFDIR) */

int conf_replace(char *conffile, char *wordtoreplace, char *replacewith){

  int maxlinelen = 120;

  char *fileOrig;

  char *fileRepl;

  _distren_asprintf(&fileOrig, "%s/%s", SYSCONFDIR, conffile);

  _distren_asprintf(&fileRepl, "%s%s.edited", SYSCONFDIR, conffile);

  char buffer[maxlinelen+2];

  char *buff_ptr, *find_ptr;

  FILE *fp1, *fp2;

  size_t find_len = strlen(wordtoreplace);

  fp1 = fopen(fileOrig,"r");

  fp2 = fopen(fileRepl,"w");

  if (fp1 ==NULL){

    fprintf(stderr, "%s doesn't exist\n",fileOrig);

    return 0;

  }

  else if(fp2 ==NULL){

    fprintf(stderr, "Can't write a file to disk! Check permissions.\n");

    return 0;

  }

  else{

    while(fgets(buffer,maxlinelen+2,fp1))

      {

        buff_ptr = buffer;

        while ((find_ptr = strstr(buff_ptr,wordtoreplace)))

        {

           while(buff_ptr < find_ptr)

             fputc((int)*buff_ptr++,fp2);

           fputs(replacewith,fp2);

           buff_ptr += find_len;

         }

         fputs(buff_ptr,fp2);

      }

    rename(fileRepl, fileOrig);

  }

  fclose(fp2);

  fclose(fp1);

  fprintf(stderr,"Wrote conf file...\n");

return 1; // Success

}

/* Executors */

/** Executor function for Blender operations */

int exec_blender(char *input, char *output, int frame)

{

  fprintf(stderr,"Preparing to execute...\n");

  int ret;

  char *frame_str;

  char *command = "blender"; // @TODO: We currently expect this to be in PATH

  char *cmd[] = { command, "-b", "-o", output, input, "-f", frame_str, (char *)NULL }; // arguments for blender

  char buf[10];

  struct execio *testrem;

  size_t readlen;

  _distren_asprintf(&frame_str, "%i", frame);

  fprintf(stderr,"Executing: %s\n", frame_str);

  ret = execio_open(&testrem, command, cmd);

  buf[9] = '\0';

  while(!execio_read(testrem, buf, 9, &readlen))

    {

      if(readlen > 9) {

        fprintf(stderr, "Something is terribly wrong!\n");

       }

       buf[readlen] = '\0';

       fprintf(stderr, "read \"%s\"\n", buf);

    }

  execio_close(testrem);

  return ret;

}

void xmlinit()

{

  xmlInitParser();

  xmlXPathInit();

}

void xmlcleanup()

{

  xmlCleanupParser();

}

/** Creates directories recursively */

int distren_mkdir_recurse(char *dirname)

{

  size_t counter;

  char *nextdir;

  nextdir = strdup(dirname);

  for(counter = 0; nextdir[counter]; counter ++)

    {

      /** @TODO OS-portabalize the path-separators */

      if(nextdir[counter] == '/')

        {

          nextdir[counter] = '\0';

          mkdir(nextdir, S_IRWXU | S_IRGRP | S_IROTH);

          nextdir[counter] = '/';

        }

    }

  return 0;

}

/**

 @TODO: Use for constructing path to job data locally and/or on data.distren.org

 */

int job_build_path(char *filename, unsigned int jobnum)

{

  return 0;

}

int downloadTar(char *url, char *destinationPath){

  // Prepare to download the job tar if it isn't  present

  struct stat buffer;

  int fstatus = stat(destinationPath, &buffer);

  if(fstatus == -1)

    {

      // Download the Tar

      if( curlget(url, destinationPath) == 0){

        fprintf(stderr, "Job data retrieved successfully\n");

        free(url);

        return 0;

      }

      else {

        fprintf(stderr, "Downloading job data from %s failed. Check your network connection.\n",url);

        free(url);

        return 1; // Eventually make a retry loop

      }

    }

  else{

    fprintf(stderr, "Tar already exists! Download cancelled.\n");

    return 2;

  }

}

int uploadOutput(char *pathtoOutput, char *urltoOutput){

  if( !curlpost(pathtoOutput, urltoOutput)) // Uploads output

    {

      fprintf(stderr,"Upload successful, removing old output...\n");

      remove(pathtoOutput); // Delete the file after its uploaded

      return 0;

    }

  else

    {

      fprintf(stderr,"Upload failed. Check your network connection. Retrying upload...\n");

      int tries=1;

      while(tries<=10 && curlpost(pathtoOutput, urltoOutput))

        {

          fprintf(stderr, "Upload failed. Trying again in 10 seconds... (attempt %d of 10)\n", tries);

          tries++;

          sleep(10);

        }

      return 1; // Upload failed after multiple tries

      // @FUTURE: Keep track of files that we were unable to upload, and upload them later

    }

}

int unpackJob(char *pathtoTar, int jobnum){

  _distren_asprintf(&outdir, "/tmp/distren/job%d", jobnum);

  mkdir(outdir, 0750);

  system(tarcmd);

  free(tarcmd);

  free(pathtoTar);

  free(outdir);

  return 0;

}

void prepareJobPaths(int jobnum,char *datadir, char **urltoTar,char **pathtoTar,char **pathtoJobfile,char **urltoOutput,char **pathtoXml){

  // Variable Preparation

  char *jobdatapath;

   _distren_asprintf(&jobdatapath, "job%d", jobnum);

   _distren_asprintf(urltoTar, "http://data.distren.org/job%d/job%d.tar.gz", jobnum); // Prepares URL to download from

   _distren_asprintf(pathtoTar, "%s/stor/jobdata/job%d.tar.gz", datadir, jobnum); // Prepares destination to save to

   _distren_asprintf(pathtoJobfile, "%s/%s/job.blend", datadir, jobdatapath ); // Prepares the path to the jobfile

   _distren_asprintf(urltoOutput, "http://data.distren.org/tmp/", jobdatapath ); // Prepares the URL where output is posted

   _distren_asprintf(pathtoXml, "%s/job%d/job%d.xml", datadir, jobnum ); // Prepares the path to the job's XML file

   free(jobdatapath);

}

int checkUsername(char *username){

  if(username == NULL || strcmp(username, "!username") == 0 ) {

     fprintf(stderr, "\nPlease ensure that your username is present in distrenslave.conf\n");

     return 0;

   }

   else

     if( username != NULL || strcmp(username, "!username") != 0 )

       {

         // Log in the user

         if(login_user(username) == 1){

           fprintf(stderr, "You should now be logged into distren.\n");

           return 0;

         }

         else

           {

             fprintf(stderr, "Login failed, please check your username. If you have not registered, please do so on the DistRen website.\n");

             return 1;

           }

       }

     else

       {

         fprintf(stderr, "Please check your distrenslave.conf, it appears to be incorrectly formatted.\n");

         return 1;

       }

}