#include "game_state.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

char *word_bank[] = {
  "hypothesis",
  "science",
  "usurp",
  "conditional",
  "passionate",
  "orion",
  NULL // sentinel value marking end
};

struct game_state {
  char **curr_el;
  unsigned short curr_letter_index;
  unsigned short wins;
};

static struct game_state state;

void init_game_state() {
  state.curr_el = word_bank;
  state.curr_letter_index = 0;
  state.wins = 0;
}

// Gets the word at the current element. Will always return a valid non-null pointer to first char of the word
char *get_curr_word() {
  assert(state.curr_el != NULL);
  assert((*state.curr_el) != NULL);
  return *state.curr_el;
}

char get_curr_letter() {
  char *word = get_curr_word();
  return word[state.curr_letter_index];
}

int get_curr_letter_index() {
  return state.curr_letter_index;
}

int get_wins() {
  return state.wins;
}

// goes to the next word in the word bank, wrapping when necessary
static void go_next_word() {
  if (*(state.curr_el + 1) == NULL) {
    state.curr_el = word_bank;
  } else {
    state.curr_el++;
  }

  state.wins++;
  state.curr_letter_index = 0;
}

// handle either going to the next letter or next word if at the end 
void next() {
  size_t word_len = strlen(get_curr_word());
  if (state.curr_letter_index >= word_len - 1) { // at last character
    go_next_word();
  } else {
    state.curr_letter_index++;
  }
}