//------------------------------------------------------------------------
// NAME: Radoslav Hubenov
// CLASS: XIa
// NUMBER: 22
// PROBLEM: #1
// FILE NAME: main.c (unix file name)
// FILE PURPOSE:
// Main файлът ми, който свързва всички останали файлове.
// Програмата реализира стандартната UNIX команда tail.
//------------------------------------------------------------------------

#include "tail.h"
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include "read_stdin.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>


int main(int argc, char* argv[]){
    char left_point[5] = "==> ";
    char right_point[5] = " <==\n";
    if(argc == 1){
        read_stdin();
        return 0;
    }
    for(int i = 1; i < argc; i++){
        if(!strcmp(argv[i], "-")){// Allow the user to write to stdin if '-' is one of the arguments
        read_stdin();
        continue;
        }
        if( access( argv[i], F_OK ) == -1 ) { //Check if file is opened succesfuly for error handling
        write(STDERR_FILENO, "tail: ", 6);
        write(STDERR_FILENO, "cannot open '", 13);
        write(STDERR_FILENO, argv[i], strlen(argv[i]));
        write(STDERR_FILENO, "' for reading: ", 15);
        perror("");
        continue;
        }
        if(argc > 2){ // Printing the name of the file if more than one file is opened
        write(STDOUT_FILENO, &left_point, strlen(left_point));
        write(STDOUT_FILENO, argv[i], strlen(argv[i]));
        write(STDOUT_FILENO, &right_point, strlen(right_point));
        }
        tail(argv[i]);
        if(i != argc - 1){
            write(STDOUT_FILENO, "\n", 1);
        }
    }
    return 0;
}