package runtime

import (
	"testing"

	"github.com/krow/krow-backend/go-api/internal/config"
)

// The HTTP server must not cut off a run the runtime considers legal.
//
// config.DeepestAgentDeadline duplicates the deep tier's deadline, because
// internal/runtime already imports internal/config and a cycle to share one
// number is a bad trade. This is the thing that makes the duplicate safe: the
// two drifting apart is a failing test rather than a 502 in production
// months later.
//
// It is not hypothetical. Production ran HTTP_WRITE_TIMEOUT=30s against a
// balanced deadline of 60s, so the server aborted any run over half its
// allowed time and the proxy in front reported 502 — a gateway error for
// something no gateway did.
func TestConfigKnowsTheDeepestAgentDeadline(t *testing.T) {
	deepest := LimitsForTier("deep").Deadline
	if config.DeepestAgentDeadline != deepest {
		t.Fatalf("config.DeepestAgentDeadline is %s but LimitsForTier(\"deep\") is %s — "+
			"raise the constant, or the config validation will accept a write timeout "+
			"that cuts off a legal run", config.DeepestAgentDeadline, deepest)
	}

	// And it must genuinely be the largest, or the name lies.
	for _, tier := range []string{"fast", "balanced", "deep", "nonsense"} {
		if d := LimitsForTier(tier).Deadline; d > config.DeepestAgentDeadline {
			t.Errorf("tier %q allows %s, which exceeds DeepestAgentDeadline %s",
				tier, d, config.DeepestAgentDeadline)
		}
	}
}