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

typedef struct {
    int position[2];
    char character_direction;
} character_t;

char * sanitize_input(char string[]);
character_t * get_new_position(char * string, character_t *character);

int main() {
    character_t *character = (character_t*)malloc(sizeof(character_t));
    character->position[0] = 0;
    character->position[1] = 0;
    character->character_direction = 'N';
    FILE* f = fopen("input.txt", "r");
    while(!feof(f)) {
        char input[10];
        fscanf(f, "%s", input);
        char * string = sanitize_input(input);
        get_new_position(string, character);
    }

    printf("Position: [%i, %i]\n", character->position[0], character->position[1]);
    printf("Blocks away: %i\n", abs(character->position[0]) + abs(character->position[1]));
    return 0;
}

char * sanitize_input(char string[]) {
    for(int i = 0; i < strlen(string); i++) {
        if(string[i] == ',' || string[i] == ' ') {
            string[i] = '\0';
        }
    }
    return string;
}

character_t * get_new_position(char * string, character_t *character) {
    int * character_position = character->position;
    char character_direction = character->character_direction;
    char new_direction;
    int steps;
    sscanf(string, "%c%i", &new_direction, &steps);

    if(character_direction == 'N') {
        if(new_direction == 'R') {
            character_direction = 'E';
            character_position[0] += steps;
        } else if(new_direction == 'L') {
            character_direction = 'W';
            character_position[0] -= steps;
        }
    } else if(character_direction == 'W') {
        if(new_direction == 'R') {
            character_direction = 'N';
            character_position[1] += steps;
        } else if(new_direction == 'L') {
            character_direction = 'S';
            character_position[1] -= steps;
        }
    } else if(character_direction == 'S') {
        if(new_direction == 'R') {
            character_direction = 'W';
            character_position[0] -= steps;
        } else if(new_direction == 'L') {
            character_direction = 'E';
            character_position[0] += steps;
        }
    } else if(character_direction == 'E') {
        if(new_direction == 'R') {
            character_direction = 'S';
            character_position[1] -= steps;
        } else if(new_direction == 'L') {
            character_direction = 'N';
            character_position[1] += steps;
        }
    }
    character->character_direction = character_direction;
    character->position[0] = character_position[0];
    character->position[1] = character_position[1];
    return character;
}