package observability

import (
	"testing"
	"time"
)

func TestCollectorSnapshot(t *testing.T) {
	t.Parallel()

	c := NewCollector()
	c.Observe(200, 100*time.Millisecond)
	c.Observe(404, 300*time.Millisecond)
	c.Observe(500, 500*time.Millisecond)

	s := c.Snapshot()
	if s.TotalRequests != 3 {
		t.Fatalf("total_requests=%d, want=3", s.TotalRequests)
	}
	if s.ClientErrors != 1 {
		t.Fatalf("client_errors=%d, want=1", s.ClientErrors)
	}
	if s.ServerErrors != 1 {
		t.Fatalf("server_errors=%d, want=1", s.ServerErrors)
	}
	if s.ServerErrorRatePct <= 0 {
		t.Fatalf("server_error_rate_pct=%f, want>0", s.ServerErrorRatePct)
	}
	if s.AvgLatencyMs <= 0 {
		t.Fatalf("avg_latency_ms=%f, want>0", s.AvgLatencyMs)
	}
	if s.MaxLatencyMs < 500 {
		t.Fatalf("max_latency_ms=%f, want>=500", s.MaxLatencyMs)
	}
}