/*

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <dirent.h>

struct arguments{
    char* directory1;
    char* directory2;
	bool r; // recursive
	bool n; // compare names only
	bool s; // compare hashes only
	bool v; // verbose (default, at the moment)
	bool h; // help
};

struct arguments get_arguments(int, char**);
void print_help(void);
void print_files_in_directory(char*, struct arguments);

int main(int argc, char* argv[]){
  	struct arguments arguments = get_arguments(argc, argv);
  	
  	if(arguments.h == true)
  		return 0;
	
	print_files_in_directory("/home/user", arguments);
  	
  	return 0;
}

struct arguments get_arguments(int argc, char** argv){
	struct arguments provided_arguments = {"", "", false, false, false, true, false};
    char option;
    while((option = getopt(argc, argv, "rnsvh")) != -1){
      switch(option){
         case 'r':
             provided_arguments.r = true;
             break;
         case 'n':
             provided_arguments.n = true;
             break;
         case 's':
            provided_arguments.s = true;
            break;
      	 case 'v':
      	 	provided_arguments.v = true;
      	 	break;
      	 case 'h':
      	 	provided_arguments.h = true;
      	 	print_help();
      	 	break;
      }
   }
   return provided_arguments;
}

void print_help(void){
	printf("Usage: dircomp directory1 directory2 [-r] [-n] [-s] [-v] [-h]\n\n");
	printf("  -r \t\t Recursive\n");
	printf("  -n \t\t Compare file names only\n");
	printf("  -s \t\t Compare file hashes only\n");
	printf("  -v \t\t Verbose\n");
	printf("  -h \t\t Print this help and quit\n\n");
}

/*
*	References:
*	https://www.gnu.org/software/libc/manual/html_node/Directory-Entries.html
*/
void print_files_in_directory(char* directory, struct arguments arguments){
	printf("\nAnalyzing directory %s\n", directory);
  	DIR *d;
  	struct dirent *dir;
  	d = opendir(directory);
  	if (d) {
    	while ((dir = readdir(d)) != NULL) {
    
    		// is file
    		if (dir -> d_type == DT_REG)
  			{
  				if(arguments.v == true)
     				printf("Analyzing file: %s\n", dir -> d_name);
  			}
  	
  			// is directory
  			if (dir->d_type == DT_DIR)
  			{
  				if(arguments.r == true)
  					print_files_in_directory(dir -> d_name, arguments); // todo, pass the pointer to reduce memory usage
  			}
  		
    	}
	closedir(d);
  }
}