/*
Copyright 2015 Ian Jauslin

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

#include "config.h"

#define READMODE_DEFAULT 0
#define READMODE_TIME 1
#define READMODE_SLIDELIST 2

// constructor
Config::Config(int argc,char* argv[]){
  // defaults
  loadDefaults();
  // CLI options
  readconf(argc,argv);
}

// default values
void Config::loadDefaults(){
  document_path='\0';
  presentation_time=15;
  slidelist_path='\0';
}

// read CLI options
void Config::readconf(int argc,char* argv[]){
  int i;
  // mode specifier (e.g. reading duration?)
  int mode=READMODE_DEFAULT;
  // loop over arguments
  for(i=1;i<argc;i++){
    // the i=th argument
    char* arg=argv[i];
    // behavior depends on mode
    switch(mode){
    // default mode
    case READMODE_DEFAULT:
      // - means flagging options should follow
      if(arg[0]=='-'){
	// loop over flags following -
	for(arg++;*arg!='\0';arg++){
	  switch (*arg){
	  // duration flag
	  case 't':
	    //go into duration reading mode (next argument should be the duration)
	    mode=READMODE_TIME;
	      break;
	  // slidelist flag
	  case 's':
	    //go into slidelist reading mode
	    mode=READMODE_SLIDELIST;
	  }
	}
      }
      else{
	// if the argument does not start with -, then it must denote the path to the PDF file
	document_path=arg;
      }
      break;
    // read duration mode
    case READMODE_TIME:
      //check that the argument is an integer
      if(check_int(arg)){
	sscanf(arg,"%d",&presentation_time);
      }
      else{
	printf("syntax error: received argument '-t %s' when -t must be followed by an integer\n",arg);
      }
      // back to default mode for next argument
      mode=READMODE_DEFAULT;
      break;

    // read slidelist mode
    case READMODE_SLIDELIST:
      slidelist_path=arg;
      // back to default mode for next argument
      mode=READMODE_DEFAULT;
    }
  }
}

// display configuration options
void Config::showconf(){
  printf("document: %s\n",document_path);
  printf("presentation duration: %d\n",presentation_time);
  printf("slidelist: %s\n",slidelist_path);
}

// check whether a string is an integer
bool Config::check_int(char* string){
  // yes?
  bool ret=1;
  for(;*string!='\0';string++){
    // is the character a digit?
    ret=ret && isdigit(*string);
  }
  return(ret);
}

// empty destructor
Config::~Config(){
}