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

char dirname[256],fname[256],path[512];
char* selectFile() {
        DIR *dir = NULL;
        FILE *f;
    struct dirent *pent = NULL;
        while(dirname != 0){
                char *dirname = "G:/cfile";
                dir = opendir(dirname);
                printf("\nChoose file:\n");
            while((pent= readdir(dir))!=NULL){
                                printf("%s\n",pent->d_name);
                        }
                scanf("%s",fname);
                char *extn = strrchr(fname, '.');
                while(!strcmp(extn, ".c") == 0) {
                        printf("\nFile must be with extension .c, please choose file with extension .c:\n");
                        dir = opendir(dirname);
                        while((pent= readdir(dir))!=NULL){
                                printf("%s\n",pent->d_name);
                        }
                        scanf("%s",fname);
                        }

                char wholeName[512];
                strcpy(wholeName,dirname);
                strcat(wholeName,"/");
                strcat(wholeName,fname);
                strcat(path,wholeName);

                while((f=fopen(wholeName,"r"))==NULL){
                                printf("The file does not exist!\n please choose file: ");
                                scanf("%s",fname);
                                strcpy(wholeName,dirname);
                                strcat(wholeName,"/");
                                strcat(wholeName,fname);
                                strcat(path,wholeName);
                }
                closedir (dir);
                return dir;
        }
}
void longestShortestLine()
{
                int charsInLIne = 0,lineMin = 0,lineMax=0,line=0,c;
        FILE *fp;
        fp = fopen(path,"r");
        c = getc(fp);
        printf("\n");
                int max = 0;
                int min = 2000000;
        while(c != EOF){
                c = getc(fp);
                if(c == '\n' && charsInLIne > 0){
                                                line++;
                                                if(charsInLIne > max){
                                                        max = charsInLIne;
                                                        lineMax = line;
                                                        }
                                                if(charsInLIne < min){
                                                        min = charsInLIne;
                                                        lineMin = line;
                                                        }
                                        charsInLIne = 0;
                }
                                if(c != '\n'){
                                        charsInLIne++;
                                        }

        }
                printf("Longest line chars: %d at line: %d\n",min,lineMin);
                printf("Shortest line chars: %d at line: %d\n",max,lineMax);
        fclose(fp);
}

void avgChRowToAllCh()
{
        int charsInLIne = 0,chars = 0,c;
        FILE *selectedFile;
        selectedFile = fopen(path,"r");
        c = getc(selectedFile);

        while (c != EOF)
        {
                chars++;
                c = getc(selectedFile);
        }
        fclose(selectedFile);
        FILE *fp;
        fp = fopen(path,"r");
        c = getc(fp);
        int line = 1;
        printf("\n");
        printf("-------------------------------------------------\n");
        printf("Line       *   Chars in line       All chars\n");
        printf("-------------------------------------------------\n");

        while(c != EOF){
                c = getc(fp);
                if(c == '\n'){
                        printf("Line:%-5d *   Chars in line:%-5d All chars:%d  \n",line,charsInLIne,chars);
                        printf("-------------------------------------------------\n");
                        charsInLIne = 0;
                        line ++;
                }
                charsInLIne++;

        }
        fclose(fp);
}

void countComments()
{
        int comments = 0, c;
        FILE *selectedFile;
        selectedFile = fopen(path,"r");
        c = getc(selectedFile);
        int newLine = 1;
        while(c != EOF){
                        c = fgetc(selectedFile);
                        if(c == '\n'){
                                        newLine = 1;
                        }
                        if(c == '/' && newLine == 1){
                                        c = fgetc(selectedFile);
                                        if(c == '/'){
                                                        comments++;
                                                        newLine = 0;
                                                        }
                                        }
        }
        printf("\n");
        printf("\nAll comment in %s are:%d\n",fname, comments);
}
int main ()
{
        char menu;
        do{
                        printf("Selected file: %s",fname);
                        printf("\n1. Select a file: \n");
                        printf("2. Longest  and Shortest Line\n");
                        printf("3. Average symbols in rows : all symbols \n");
                        printf("4. Shows the number of inline comments //.\n");
                        printf("5. Quit\n");
                        menu = getche();
                        switch(menu){
                                        case '1': selectFile();break;
                                        case '2': longestShortestLine();break;
                                        case '3': avgChRowToAllCh();break;
                                        case '4': countComments( );break;
                                        case '5': printf("\n\Quit");break;
                                        default: printf("\n\nPlease enter number between 1-5");
                        }
        }while(menu!= '5');
        return 0;
}