#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main (int argc, char *argv[])
{

	FILE *fp1;
	FILE *fp2;
	int i=0,open1=0,open2=0,p=0,j=0;
	int is_file=0,is_out=0;
	char temp[20];
	char c;
	int characters=0,lines=0,counter=0;
	int length,shift=13;
	int number_arg, length_text1=0,length_text2=0;
	int number_of_args=0;

	number_of_args = argc;
	
	printf("number of arguments %d \n", number_of_args);	
		
	for (i=1; i<number_of_args; i++)
	{
		printf("Hello\n");
		if(argv[i][1] == 70 && argv[i][2] == '\0')
		{
			printf("There is a F\n");
			is_file=1; /* If there is a file then 1 is true*/
			open1=i+1;
		}
		if(argv[i][1]== 70 && argv[i][2] !='\0') /* NOTE TO SELF remove -O and -F in these cases */
		{
			printf("Shouldnt be in here");
			is_file=1;	
			open1=i;
			length_text1=strlen(argv[i]);
			for (p=2; p<=(length_text1);p++) 
			{
				temp[j]= argv[i][p];
				j++;
			}
			j=0;
			strcpy(argv[i],temp);
		}
		if(argv[i][1] == 79 && argv[i][2] == '\0')
		{
			is_out=1;
			open2=i+1;
			printf("is_out is %d\n", is_out);
		}
			
	}

		printf("We are outside the loop");

	if(is_file == 1)
	{
		fp1 = fopen (argv[open1], "r");
        if ( fp1 == NULL ) {
            printf( "Can't open fp1\n" );
        }
		while ((c=getc(fp1))!=EOF) /* Count how many characters and new lines there are */
		{
			if (c == '\n')
				lines++;
			characters++;
		}
	}

	if(is_out == 1) /* if there is a output file create the file pointer */
		fp2 = fopen (argv[open2], "w");
	
	if (is_file == 0 && is_out==1) /* if there isnt a file and there is a output */
	{
		char words[80];
		while (fgets(words,80,stdin) != NULL)
		{
		
			for(i=0; i<= characters; i++)
			{
				if(words[i] >= 65 && words[i] <=90) /*check for upper case letters to be shifted */
				{
					words[i] = words[i] + shift;
					if (words[i] <= 64)
						words[i] = words[i] + 26;
				}
				if (words[i] >= 97 && words[i] <= 122) /*check for lower case letters to be shifted */
				{
					words[i] = words[i] -32;	/*convert to uppercase */
					words[i] = words[i] + shift;	
					if (words[i] <= 64)
						words[i] = words[i] +26;
					words[i] = words[i] + 32;

				}
			}
			fprintf(fp2,"%s", words);
		}
	}
	else if (is_file == 0 && is_out == 0) /* if there isnt a file or a output file */
	{
		char words[80];
		while (fgets(words,80,stdin) != NULL)
		{
		
			for(i=0; i<= characters; i++)
			{
				if(words[i] >= 65 && words[i] <=90) /*check for upper case letters to be shifted */
				{
					words[i] = words[i] + shift;
					if (words[i] <= 64)
						words[i] = words[i] + 26;
				}
				if (words[i] >= 97 && words[i] <= 122) /*check for lower case letters to be shifted */
				{
					words[i] = words[i] -32;	/*convert to uppercase */
					words[i] = words[i] + shift;	
					if (words[i] <= 64)
						words[i] = words[i] +26;
					words[i] = words[i] + 32;

				}
			}
			printf("%s", words);
		}
	}

	if (is_file == 1 && is_out == 1)
	{
		fclose (fp1);/*close to start again at the top of the file */
		fp1 = fopen (argv[open1], "r");


		if (argv[number_arg][0] == '-')
		{
			char words[80];
			while (counter != lines) /*shift every letter but keep spaces and numbers in their same positions */
			{
				fgets(words,characters,fp1);
			
				for(i=0; i<= characters; i++)
				{
					if(words[i] >= 65 && words[i] <=90) /*check for upper case letters to be shifted */
					{
						words[i] = words[i] + shift;
						if (words[i] <= 64)
							words[i] = words[i] + 26;
					}
					if (words[i] >= 97 && words[i] <= 122) /*check for lower case letters to be shifted */
					{
						words[i] = words[i] -32;	/*convert to uppercase */
						words[i] = words[i] + shift;	
						if (words[i] <= 64)
							words[i] = words[i] +26;
						words[i] = words[i] + 32;
	
					}
				}
				fprintf(fp2,"%s", words);
				counter++;
			}	
		}
		else
		{
			char words[80];
			while (counter != lines) /*shift every letter but keep spaces and numbers in their same positions */
			{
					fgets(words,characters,fp1);
				
					for(i=0; i<= characters; i++)
					{
						if(words[i] >= 65 && words[i] <=90) /*check for upper case letters to be shifted */
						{
							words[i] = words[i] + shift;
							if (words[i] >= 91)
								words[i] = words[i] -26;
						}
						if (words[i] >= 97 && words[i] <= 122) /*check for lower case letters to be shifted */
						{
							words[i] = words[i] -32;
							words[i] = words[i] + shift;
							if (words[i] >= 91)
								words[i] = words[i] -26;
							words[i] = words[i] + 32;
		
						}
					}
				fprintf(fp2,"%s", words);
				counter++;

		}	
	}
    }
	
	return 0;
}