module metrics

fn test_implements_interface() {
	_ := MetricsCollector(new_default_collector())
}

fn test_null_implements_interface() {
	_ := MetricsCollector(new_null_collector())
}

fn test_counter_increment() {
	mut m := new_default_collector()

	m.counter_increment(name: 'test')
	assert m.counter_get(name: 'test')? == u64(1)

	m.counter_increment(name: 'test')
	assert m.counter_get(name: 'test')? == u64(2)

	// Test with labels
	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}

	m.counter_set(15, metric)
	m.counter_increment(metric)
	assert m.counter_get(metric)? == u64(16)
}

fn test_histogram() {
	mut m := new_default_collector()

	m.histogram_record(5.0, name: 'test')
	assert m.histogram_get(name: 'test')? == [5.0]

	m.histogram_record(7.0, name: 'test')
	assert m.histogram_get(name: 'test')? == [5.0, 7.0]

	// Test with labels
	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}

	m.histogram_record(5.0, metric)
	assert m.histogram_get(metric)? == [5.0]

	m.histogram_record(7.0, metric)
	assert m.histogram_get(metric)? == [5.0, 7.0]
}

fn test_gauge_add() {
	mut m := new_default_collector()

	m.gauge_add(5.0, name: 'test')
	assert m.gauge_get(name: 'test')? == 5.0

	// Test with labels
	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}

	m.gauge_set(3.0, metric)
	m.gauge_add(5.0, metric)
	assert m.gauge_get(metric)? == 8.0
}

fn test_gauge_sub() {
	mut m := new_default_collector()

	m.gauge_sub(5.0, name: 'test')
	assert m.gauge_get(name: 'test')? == -5.0

	// Test with labels
	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}

	m.gauge_set(3.0, metric)
	m.gauge_sub(5.0, metric)
	assert m.gauge_get(metric)? == -2.0
}

fn test_gauge_set() {
	mut m := new_default_collector()

	m.gauge_set(3.0, name: 'test')
	assert m.gauge_get(name: 'test')? == 3.0
	m.gauge_set(5.0, name: 'test')
	assert m.gauge_get(name: 'test')? == 5.0

	// Test with labels
	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}

	m.gauge_set(3.0, metric)
	assert m.gauge_get(metric)? == 3.0
	m.gauge_set(5.0, metric)
	assert m.gauge_get(metric)? == 5.0
}