package main

import (
	"strings"
	"testing"
	"time"
)

func benchFixture(ts string, p50, p95 float64) *renderBenchResults {
	return &renderBenchResults{
		Timestamp: ts,
		Instance:  "blockninjacms.blockninja.dev",
		Pages: []renderBenchPage{
			{Page: "home", Path: "/", Gating: true, P50Ms: p50, P95Ms: p95},
			{Page: "blog-post", Path: "/blog/x", P50Ms: 18, P95Ms: 25},
		},
	}
}

func TestCompareRenderPerf(t *testing.T) {
	now := time.Date(2026, 7, 7, 12, 0, 0, 0, time.UTC)
	baseline := benchFixture("2026-07-06T16:47:00Z", 27.3, 37.0)

	t.Run("within threshold passes", func(t *testing.T) {
		v := compareRenderPerf(baseline, benchFixture("2026-07-07T10:00:00Z", 30.0, 40.0), now)
		if v.skip || v.fail {
			t.Fatalf("expected pass, got %+v", v)
		}
	})

	t.Run("p50 regression fails with investigate message", func(t *testing.T) {
		v := compareRenderPerf(baseline, benchFixture("2026-07-07T10:00:00Z", 40.0, 41.0), now)
		if !v.fail {
			t.Fatalf("expected fail, got %+v", v)
		}
		for _, want := range []string{"slower than baseline", "Investigate before proceeding", "do NOT raise the baseline", "Captain approval"} {
			if !strings.Contains(v.message, want) {
				t.Errorf("fail message missing %q: %s", want, v.message)
			}
		}
	})

	t.Run("p95-only regression warns via secondary gate", func(t *testing.T) {
		v := compareRenderPerf(baseline, benchFixture("2026-07-07T10:00:00Z", 28.0, 60.0), now)
		if !v.warn || v.fail {
			t.Fatalf("expected warn (not fail) for p95-only breach, got %+v", v)
		}
		if !strings.Contains(v.message, "p95") {
			t.Errorf("expected p95 metric in message: %s", v.message)
		}
	})

	t.Run("stale latest skips", func(t *testing.T) {
		v := compareRenderPerf(baseline, benchFixture("2026-06-20T10:00:00Z", 40.0, 60.0), now)
		if !v.skip {
			t.Fatalf("expected skip for stale result, got %+v", v)
		}
		if !strings.Contains(v.message, "dojo") {
			t.Errorf("skip message should say how to refresh: %s", v.message)
		}
	})

	t.Run("latest predating baseline skips", func(t *testing.T) {
		v := compareRenderPerf(baseline, benchFixture("2026-07-06T10:00:00Z", 40.0, 60.0), now)
		if !v.skip {
			t.Fatalf("expected skip for pre-baseline result, got %+v", v)
		}
	})

	t.Run("boundary: exactly 25 percent passes", func(t *testing.T) {
		v := compareRenderPerf(baseline, benchFixture("2026-07-07T10:00:00Z", 27.3*1.25, 37.0), now)
		if v.fail {
			t.Fatalf("exactly-threshold should not fail: %+v", v)
		}
	})
}