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

#define NR_ROWS 10
#define NR_COLUMNS 10

#define WORD_L  32

typedef char WORD [WORD_L];

int main(){

    //Declares and initializes variables
    int row_count, col_count;
    WORD str_array[NR_ROWS][NR_COLUMNS];
    char c;
    int terminate_flag = 1, pos_m, pos_n, numb_of_lines = 0, counter = 0, temp_counter = 0;
    char str_input[1000], temp_str[32];

    //Defines and open text files
    FILE *input_file, *output_file;
    input_file = fopen("input7_3.txt", "r");
    if(input_file == NULL){
        printf("The input file does not exist or cannot be opened.\n");
        exit(1);
    }

    output_file = fopen("output7_3.txt", "w");
    if(input_file == NULL){
        printf("The output file cannot be created or cannot be opened.\n");
        exit(1);
    }

    //Initializes the array as null strings
    for(row_count = 0; row_count < 10; row_count++){
        for(col_count = 0; col_count < 10; col_count++){
            strcpy(str_array[row_count][col_count], "");
        }
    }

    //=============================

    //Inroduces the program
    printf("\n");

    //=============================

    printf("Note: The counting is starting from 0 like an array.\n");

    row_count = 0;
    col_count = 0;
    while (fscanf (input_file, "%s", str_array[row_count][col_count]) != EOF) {
        // removes the space after the first word of the line
        c = fgetc (input_file);
        col_count++;
        // read all the remaining words of the current line
        while (c != '\n' && c != EOF) {
            fscanf (input_file, "%s", str_array[row_count][col_count]);
            //printf("%d, %d: %s\n", row_count, col_count, str_array[row_count][col_count]);
            c = fgetc (input_file);
            //printf("%c\n", c);
            col_count++;
        }
        strcpy(str_array[row_count][col_count], "");
        //printf("T %d, %d: %s\n", row_count, col_count, str_array[row_count][col_count]);
        //str_array[row_count][col_count]
        numb_of_lines++;
        row_count++;
        col_count = 0;
    } // while
    numb_of_lines;

    printf("%c\n", str_array[4][8]);

    for(row_count = 0; row_count < numb_of_lines; row_count++){
        printf("Line %d: ", row_count);
        col_count = 0;
        while(strcmp(str_array[row_count][col_count], "\0")){
            //printf("%d  ", col_count);
            printf("%s ", str_array[row_count][col_count]);
            col_count++;
        }
        col_count = 0;
        printf("\n");
    }

    printf("I - Inserts a new line.\n");
    printf("D - deletes all lines between m and n\n");
    printf("R - Replaces 2 lines between m and n\n");
    printf("E - Terminates editing\n");

    while(terminate_flag){
        printf("Please give an input of I, D, R, or E: ");
        scanf("%c", &c);
        fflush(stdin);
        switch(c){
            case'i':
            case'I':{
                printf("Input the line m that the line will be inserted after: ");
                scanf("%d", &pos_m);
                printf("Input the line you wish to input: ");
                scanf("%s", str_input);

                if(numb_of_lines == 9){
                    numb_of_lines = 8;
                }
                fflush(stdin);
                //If it is set to be after position m, line 0 can never be changed
                for(row_count = numb_of_lines; row_count >= pos_m; row_count--){
                    for(col_count = 0; col_count < 10; col_count++){
                        strcpy(str_array[row_count + 1][col_count], str_array[row_count][col_count]);
                        strcpy(str_array[row_count][col_count], "\0");
                    }
                        printf("\n");
                }
                for(counter = 0; counter > strlen(str_input); counter++){
                    if(str_input[counter] != '0' || str_input[counter] != '\0'){
                        temp_str[temp_counter];
                        temp_counter++;
                    }
                }
                numb_of_lines++;
                break;
            }
            case'd':
            case'D':{
                printf("Input the line m: ");
                scanf("%d", &pos_m);
                fflush(stdin);
                printf("Input the line n: ");
                scanf("%d", &pos_n);
                fflush(stdin);
                for(row_count = pos_n; row_count >= pos_m; row_count--){
                    for(col_count = 0; col_count < 10; col_count++){
                        strcpy(str_array[row_count][col_count], "\0");
                    }
                        printf("\n");
                }
                break;
            }
            case'r':
            case'R':{
                printf("Input the line m: ");
                scanf("%d", &pos_m);
                fflush(stdin);
                printf("Input the line n: ");
                scanf("%d", &pos_n);
                fflush(stdin);

                break;
            }
            case'e':
            case'E':{
                terminate_flag = 0;
                break;
            }
            default: printf("Invalid input.\n");
        }

        for(row_count = 0; row_count < numb_of_lines; row_count++){
            printf("Line %d: ", row_count);
            col_count = 0;
            while(strcmp(str_array[row_count][col_count], "\0")){
                //printf("%d  ", col_count);
                printf("%s ", str_array[row_count][col_count]);
                col_count++;
            }
            col_count = 0;
            printf("\n");
        }

    }



    //======================================

    //Closes the files
    fclose(input_file);
    fclose(output_file);

    return 0;// Exits the program
}