package kiwix

import (
	"context"
	"os"
	"testing"
	"time"
)

// TestLiveTopicBeatsTheSentence — the measurement V-668 turned on, kept as a
// test so the claim can be re-run rather than believed.
//
// It prints the article the old path returned and the article the new one
// returns, for the same question. It asserts nothing about which is better,
// because "is this the right article" is a human's call. It fails only if the
// two paths agree on every case, which would mean the change does nothing.
//
//	MAVEN_KIWIX_URL=http://127.0.0.1:8034 make t PKG=./internal/kiwix/ RUN=TestLive V=1
func TestLiveTopicBeatsTheSentence(t *testing.T) {
	base := os.Getenv("MAVEN_KIWIX_URL")
	if base == "" {
		t.Skip("MAVEN_KIWIX_URL unset — point it at the kiwix-server host port")
	}
	const book = "wikipedia_ru_all_maxi_2026-02"
	c := New(base)
	questions := []string{
		"что такое TCP?",
		"что такое фотосинтез",
		"кто такой Линус Торвальдс?",
		"кто написал Войну и мир",
		"что такое чёрная дыра",
		"почему небо голубое",
		"почему трава зелёная",
		"столица Франции",
	}
	moved := 0
	for _, q := range questions {
		ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
		before := firstTitle(ctx, c, q, book)
		topic := Topic(q)
		after := ""
		for _, cand := range TitleCandidates(topic) {
			if page, err := c.Article(ctx, TitlePath(book, cand), 400); err == nil && page.Text != "" {
				after = page.Title + " (by title)"
				break
			}
		}
		if after == "" {
			after = firstTitle(ctx, c, topic, book)
		}
		cancel()
		if before != after {
			moved++
		}
		t.Logf("%-30s  before=%-34q after=%q", q, before, after)
	}
	t.Logf("%d of %d questions reach a different article", moved, len(questions))
	if moved == 0 {
		t.Error("the topic path returns exactly what the sentence path returned")
	}
}

func firstTitle(ctx context.Context, c *Client, pattern, book string) string {
	hits, err := c.Search(ctx, pattern, book, 3)
	if err != nil || len(hits) == 0 {
		return "(nothing)"
	}
	return hits[0].Title
}