#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <string.h>
#include "input.h"

#define INPUT "input/04.txt"
#define EXPECTED1 573L
#define EXPECTED2 867L

void part1(struct input_str* input) {
	size_t overlap_count = 0;
	int section_range[4];
	for(size_t i = 0; i < input->line_count; i++) {
		// strtok will butcher our line, so give it a copy!
		char* line = copy_line(input->lines[i]);
		for(int a = 0; a < 4; a++) {
			char* section = NULL;
			if(a == 0)
				section = strtok(line, "-,");
			else
				section = strtok(NULL, "-,");

			section_range[a] = atoi(section);
		}
		free(line);
		line = NULL;
		// check range inclusion
		if((section_range[0] <= section_range[2] && section_range[1] >= section_range[3]) || (section_range[2] <= section_range[0] && section_range[3] >= section_range[1]))
			overlap_count++;
	}
	CHECK(overlap_count, EXPECTED1)
}

void part2(struct input_str* input) {
	size_t overlap_count = 0;
	int section_range[4];
	for(size_t i = 0; i < input->line_count; i++) {
		// strtok will butcher our line, so give it a copy!
		char* line = copy_line(input->lines[i]);
		for(int a = 0; a < 4; a++) {
			char* section = NULL;
			if(a == 0)
				section = strtok(line, "-,");
			else
				section = strtok(NULL, "-,");

			section_range[a] = atoi(section);
		}
		free(line);
		line = NULL;
		// check range overlap
		if((section_range[2] <= section_range[1] && section_range[3] >= section_range[0]) || (section_range[0] <= section_range[3] && section_range[1] >= section_range[2]))
			overlap_count++;
	}
	CHECK(overlap_count, EXPECTED2)
}

int main() {
	// read input
	struct input_str input;
	input_str_read(&input, INPUT);

	// do stuff
	part1(&input);
	part2(&input);

	// cleanup & exit
	input_str_free(&input);
	return 0;
}