package service

import (
	"context"
	"encoding/json"
	"os"
	"testing"

	"github.com/Tencent/WeKnora/internal/types"
	"github.com/Tencent/WeKnora/internal/types/interfaces"
	"github.com/stretchr/testify/require"
)

// checkpointsWikiPages serves the real pages of one knowledge base from a fixture.
type checkpointsWikiPages struct {
	interfaces.WikiPageService
	bySlug map[string]*types.WikiPageLite
}

func (f checkpointsWikiPages) ListBySlugs(ctx context.Context, kbID string, slugs []string) (map[string]*types.WikiPageLite, error) {
	out := make(map[string]*types.WikiPageLite, len(slugs))
	for _, slug := range slugs {
		if page := f.bySlug[slug]; page != nil {
			out[slug] = page
		}
	}
	return out, nil
}

func (f checkpointsWikiPages) FindPagesByNormalizedTitles(ctx context.Context, kbID, pageType string, identities []string) ([]*types.WikiPageLite, error) {
	wanted := make(map[string]bool, len(identities))
	for _, identity := range identities {
		wanted[identity] = true
	}
	var out []*types.WikiPageLite
	for _, page := range f.bySlug {
		if page.PageType == pageType && wanted[normalizeWikiIdentityTitle(page.Title)] {
			out = append(out, page)
		}
	}
	return out, nil
}

// Replays the fifteen real candidate payloads of one document through the complete
// reading-tail path (normalize, resolve, merge) against the pages that knowledge base
// really owns, so a conflict that aborted the document in production is reproduced
// and then fixed offline.
func TestWikiRealWindowsFullResolution(t *testing.T) {
	windowsPath, pagesPath := os.Getenv("WIKI_REPLAY_FILE"), os.Getenv("WIKI_PAGES_FILE")
	if windowsPath == "" || pagesPath == "" {
		t.Skip("WIKI_REPLAY_FILE and WIKI_PAGES_FILE must be set")
	}
	rawWindows, err := os.ReadFile(windowsPath)
	require.NoError(t, err)
	var texts []string
	require.NoError(t, json.Unmarshal(rawWindows, &texts))

	rawPages, err := os.ReadFile(pagesPath)
	require.NoError(t, err)
	var pages []*types.WikiPageLite
	require.NoError(t, json.Unmarshal(rawPages, &pages))
	bySlug := make(map[string]*types.WikiPageLite, len(pages))
	for _, page := range pages {
		bySlug[page.Slug] = page
	}

	merged := combinedExtraction{}
	for i, text := range texts {
		var part combinedExtraction
		require.NoError(t, json.Unmarshal([]byte(text), &part), "window %d", i)
		merged.Entities = append(merged.Entities, part.Entities...)
		merged.Concepts = append(merged.Concepts, part.Concepts...)
	}

	normalized, err := normalizeWikiFreshCandidates(merged)
	require.NoError(t, err, "normalization rejected the real candidate set")
	t.Logf("normalized: E=%d C=%d", len(normalized.Entities), len(normalized.Concepts))

	service := &wikiIngestService{wikiService: checkpointsWikiPages{bySlug: bySlug}}
	resolved, err := service.resolveWikiSourceIdentities(context.Background(), "kb-real", normalized, nil)
	require.NoError(t, err, "identity resolution rejected the real candidate set")
	t.Logf("resolved: E=%d C=%d pruning=%+v", len(resolved.Entities), len(resolved.Concepts), resolved.CandidatePruning)
	require.Positive(t, len(resolved.Entities)+len(resolved.Concepts), "the document must still publish pages")

	seen := map[string]string{}
	for _, item := range append(append([]extractedItem{}, resolved.Entities...), resolved.Concepts...) {
		if other, ok := seen[item.Slug]; ok && other != item.Name {
			t.Fatalf("slug %q still shared by %q and %q", item.Slug, other, item.Name)
		}
		seen[item.Slug] = item.Name
	}
	t.Logf("final identity count: %d", len(seen))
}