#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>

#include "day.h"
#include "puzzle_input.h"

#define DATA_MAX_LEN 2048

static void part_1(const int64_t * data, uint16_t data_len) {
    int64_t last_value;
    int16_t inc_count = 0;

    last_value = data[0];
    for (uint16_t i = 1; i < (uint16_t)data_len; i++) {
        if (data[i] > last_value) {
            inc_count++;
        }

        last_value = data[i];
    }
    printf("PART 1: %d values increased!\n", inc_count);
}

static void part_2(const int64_t * data, uint16_t data_len) {
    int64_t old_window_sum;
    int64_t window_sum;
    int16_t inc_count = 0;

    old_window_sum = data[0] + data[1] + data[2];

    for (uint16_t i = 3; i < (uint16_t)data_len; i++) {
        window_sum = old_window_sum - data[i-3] + data[i];

        if (window_sum > old_window_sum) {
            inc_count++;
        }

        old_window_sum = window_sum;

    }
    printf("PART 2: %d windows increased!\n", inc_count);
}

int day_1() {
    char * path = "../inputs/day_1.txt";
    uint16_t data_len;
    int64_t data[DATA_MAX_LEN];

    parse_ret_t res = read_input_single_line(path, (void *) data, DATA_MAX_LEN, parse_long_from_buff, &data_len);

    if (res == PARSER_OK) {
        part_1(data, data_len);
        part_2(data, data_len);
    }
    else {
        printf("Failed to parse data: %d\n", res);
        return res;
    }

    return 0;
}