package seo

import (
	"fmt"
	"testing"
)

func TestAnalyze_missingMetaAndImage(t *testing.T) {
	products := []ProductInput{
		{
			ID:   "p1",
			Name: "Acme UltraWidget Pro 3000 Stainless",
			Category: "Widgets",
			ProcessedAttrs: map[string]any{"brand": "Acme"},
		},
	}
	recs := Analyze(products, nil)
	types := map[string]bool{}
	for _, r := range recs {
		types[r.Type] = true
		if r.EntityID != "p1" && r.Type != TypeDuplicateTitle {
			t.Fatalf("unexpected entity %s", r.EntityID)
		}
	}
	for _, want := range []string{TypeMissingMetaTitle, TypeMissingMetaDescription, TypeMissingImage} {
		if !types[want] {
			t.Fatalf("expected type %s", want)
		}
	}
}

func TestAnalyze_duplicateAndThin(t *testing.T) {
	products := []ProductInput{
		{ID: "a", Name: "Short", MetaTitle: "x", MetaDescription: "y"},
		{ID: "b", Name: "Short", MetaTitle: "x", MetaDescription: "y"},
	}
	recs := Analyze(products, nil)
	var thin, dup int
	for _, r := range recs {
		switch r.Type {
		case TypeThinTitle:
			thin++
		case TypeDuplicateTitle:
			dup++
		}
	}
	if thin < 2 {
		t.Fatalf("expected thin titles, got %d", thin)
	}
	if dup < 2 {
		t.Fatalf("expected duplicate titles, got %d", dup)
	}
}

func TestAnalyze_duplicatePeerAndRecCaps(t *testing.T) {
	n := maxDupRecsPerTitle + maxPeerIDsPerDup + 10
	products := make([]ProductInput, 0, n)
	for i := 0; i < n; i++ {
		products = append(products, ProductInput{
			ID:              fmt.Sprintf("p%d", i),
			Name:            "Shared Title Product",
			MetaTitle:       "mt",
			MetaDescription: "md",
		})
	}
	recs := Analyze(products, nil)
	var dup int
	var peerLen int
	for _, r := range recs {
		if r.Type != TypeDuplicateTitle {
			continue
		}
		dup++
		peers, _ := r.Meta["peer_ids"].([]string)
		if peerLen == 0 {
			peerLen = len(peers)
		}
		if len(peers) > maxPeerIDsPerDup {
			t.Fatalf("peer_ids len=%d want <=%d", len(peers), maxPeerIDsPerDup)
		}
		count, _ := r.Meta["duplicate_count"].(int)
		if count != n {
			t.Fatalf("duplicate_count=%d want %d", count, n)
		}
	}
	if dup != maxDupRecsPerTitle {
		t.Fatalf("duplicate recs=%d want %d", dup, maxDupRecsPerTitle)
	}
	if peerLen != maxPeerIDsPerDup {
		t.Fatalf("peer_ids len=%d want %d", peerLen, maxPeerIDsPerDup)
	}
}

func TestAnalyze_categoryMeta(t *testing.T) {
	cats := []CategoryInput{
		{ID: "c1", UniqueID: "cat-1", Name: "AB", DescriptionTemplate: map[string]any{}},
		{ID: "c2", UniqueID: "cat-2", Name: "Appliances", DescriptionTemplate: map[string]any{
			"metaTitle": "t", "metaDescription": "d",
		}},
	}
	recs := Analyze(nil, cats)
	var missing, thin int
	for _, r := range recs {
		if r.Type == TypeCategoryMissingMeta {
			missing++
			if r.EntityID != "c1" {
				t.Fatalf("wrong category for missing meta: %s", r.EntityID)
			}
		}
		if r.Type == TypeThinCategoryName {
			thin++
		}
	}
	if missing != 1 {
		t.Fatalf("expected 1 missing meta formula, got %d", missing)
	}
	if thin != 1 {
		t.Fatalf("expected 1 thin category name, got %d", thin)
	}
}

func TestFillMetaTemplate(t *testing.T) {
	title, desc := FillMetaTemplate(ProductInput{
		Name:        "Drill 18V",
		Category:    "Tools",
		Description: "Cordless drill with battery pack for DIY projects.",
		Attributes:  map[string]any{"brand": "Bosch"},
	})
	if title == "" || desc == "" {
		t.Fatal("expected non-empty meta")
	}
	if runeLen(title) > MetaTitleMaxChars {
		t.Fatalf("title too long: %d", runeLen(title))
	}
	if runeLen(desc) > MetaDescriptionMaxChars {
		t.Fatalf("desc too long: %d", runeLen(desc))
	}
}

func TestBuildChecklist_score(t *testing.T) {
	products := []ProductInput{
		{ID: "1", Name: "Good Product Title Here", MetaTitle: "mt", MetaDescription: "md",
			MappedData: map[string]any{"image_url": "https://example.com/a.jpg"}, Category: "Good Product Title Here"},
	}
	recs := Analyze(products, nil)
	checklist, overall := BuildChecklist(recs, 1, 0)
	if overall <= 0 {
		t.Fatalf("expected positive overall, got %v", overall)
	}
	if len(checklist) != len(AllTypes()) {
		t.Fatalf("checklist len %d want %d", len(checklist), len(AllTypes()))
	}
}

func TestAllTypesStable(t *testing.T) {
	types := AllTypes()
	if len(types) != 8 {
		t.Fatalf("want 8 types, got %d", len(types))
	}
}