package domain

import (
	"errors"
	"testing"
	"time"
)

func TestValidateProbeRequiresOpaqueFreshNonceAndServerRTT(t *testing.T) {
	now := time.Unix(100000, 0)
	valid := ProbeEvidence{OpaqueLocation: []byte("opaque"), Nonce: []byte("nonce"), IssuedAt: now, Region: "EU", ServerRTT: 40 * time.Millisecond}
	if err := ValidateProbe(valid, []byte("nonce"), now); err != nil {
		t.Fatal(err)
	}
	for name, invalid := range map[string]ProbeEvidence{
		"empty location":             {Nonce: []byte("nonce"), IssuedAt: now, Region: "EU"},
		"wrong nonce":                {OpaqueLocation: []byte("opaque"), Nonce: []byte("other"), IssuedAt: now, Region: "EU"},
		"stale":                      {OpaqueLocation: []byte("opaque"), Nonce: []byte("nonce"), IssuedAt: now.Add(-ProbeFreshness - time.Nanosecond), Region: "EU"},
		"client chosen negative RTT": {OpaqueLocation: []byte("opaque"), Nonce: []byte("nonce"), IssuedAt: now, Region: "EU", ServerRTT: -time.Millisecond},
	} {
		if err := ValidateProbe(invalid, []byte("nonce"), now); !errors.Is(err, ErrInvalidProbe) {
			t.Fatalf("%s error = %v", name, err)
		}
	}
}

func TestDiscrepancyQuarantineAndFiveCleanRelease(t *testing.T) {
	now := time.Unix(100000, 0)
	var tracker DiscrepancyTracker
	for i := 0; i < DiscrepancyLimit; i++ {
		tracker.RecordComparison(40*time.Millisecond, 100*time.Millisecond, now.Add(time.Duration(i)*time.Minute))
	}
	if !tracker.Quarantined {
		t.Fatal("three discrepancies did not quarantine samples")
	}
	if err := tracker.PlacementAllowed(); !errors.Is(err, ErrProbeQuarantined) {
		t.Fatal("quarantine not enforced")
	}
	for i := 0; i < CleanSamplesToRelease; i++ {
		tracker.RecordComparison(40*time.Millisecond, 45*time.Millisecond, now.Add(time.Hour+time.Duration(i)*time.Minute))
	}
	if tracker.Quarantined {
		t.Fatal("five clean samples did not release quarantine")
	}
}

func TestDiscrepancyThresholdUsesLargerOfAbsoluteAndRelativeLimit(t *testing.T) {
	now := time.Unix(100000, 0)
	var tracker DiscrepancyTracker
	tracker.RecordComparison(200*time.Millisecond, 250*time.Millisecond, now)
	if tracker.Quarantined {
		t.Fatal("50ms discrepancy should be allowed when 30%% limit is 60ms")
	}
	tracker.RecordComparison(200*time.Millisecond, 270*time.Millisecond, now.Add(time.Minute))
	if len(tracker.BadSamples) != 1 {
		t.Fatal("70ms discrepancy should be recorded")
	}
}