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

typedef enum {
	STATUS_IDLE,
	STATUS_RUNNING,
	STATUS_STOPPED
} Status;

typedef struct {
	int x;
	int y;
} Point;

typedef struct {
	Point top_left;
	Point bottom_right;
} Rectangle;

typedef struct {
	int q;
	int w;
} Bar;

int add_numbers(int a, int b) {
	int result = a + b;
	return result;
}

int fibonacci(int n) {
	if (n <= 1) return n;
	return fibonacci(n - 1) + fibonacci(n - 2);
}

void print_rectangle(Rectangle rect) {
	printf("> Rect: (%d, %d) to (%d, %d)\n",
			rect.top_left.x, rect.top_left.y,
			rect.bottom_right.x, rect.bottom_right.y);
}

int main(int argc, char **argv) {
	const char *myenv = getenv("MYENV");

	char *args[3];
	for (int i = 0; i < argc; i++) {
		args[i] = argv[i];
	}

	int a = 100;
	int b = 123;
	int c = add_numbers(a, b);

	Bar bar = { .q = 565, .w = 949 };
	Status status = STATUS_RUNNING;

	Rectangle rect = {
		.top_left = { .x = 10, .y = 20 },
		.bottom_right = { .x = 50, .y = 80 }
	};

	printf("> MYENV: %s\n", myenv ? myenv : "NULL");
	printf("> c: %d (via add_numbers)\n", c);
	printf("> bar.q: %d\n", bar.q);
	printf("> status: %d\n", status);

	print_rectangle(rect);

	int fib5 = fibonacci(5);
	printf("> fib(5): %d\n", fib5);

	int arr[] = {10, 20, 30, 40, 50};
	int *ptr = arr;
	for (int i = 0; i < 5; i++) {
		printf("> arr[%d] = %d (via ptr: %d)\n", i, arr[i], *(ptr + i));
	}

	for (int i = 0; i < 3; i++) {
		printf("> loop %d\n", i);
	}

	return 0;
}