package service

import (
	"testing"

	"fashionapi/internal/model"
	"fashionapi/internal/pkg/imgurl"
)

// TestGroupSnapImages 验证主副图分组与「副图的副图」上浮归并。
//
//	5 张图：A 主，B 副(挂 A)；C 主；D 副(挂 C)；E 副(挂 B → 应上浮归并到 A)
//
// 期望 2 组：第 0 组 = A + [B, E]，第 1 组 = C + [D]。
func TestGroupSnapImages(t *testing.T) {
	s := &streetSnapService{img: imgurl.New("", "", "")}
	imgs := []model.StreetSnapImage{
		{ID: 1, Image: "A", Name: "A", IsDetail: 0, ParentImageID: 0},
		{ID: 2, Image: "B", Name: "B", IsDetail: 1, ParentImageID: 1},
		{ID: 3, Image: "C", Name: "C", IsDetail: 0, ParentImageID: 0},
		{ID: 4, Image: "D", Name: "D", IsDetail: 1, ParentImageID: 3},
		{ID: 5, Image: "E", Name: "E", IsDetail: 1, ParentImageID: 2}, // 2 是副图 → 上浮到 A
	}

	flat, groups := s.groupSnapImages(imgs)
	if len(flat) != 5 {
		t.Fatalf("flat 应 5 张，实际 %d", len(flat))
	}
	if len(groups) != 2 {
		t.Fatalf("groups 应为 2 组，实际 %d", len(groups))
	}

	g0 := groups[0]
	if g0.Image.Name != "A" {
		t.Fatalf("第 0 组主图应为 A，实际 %s", g0.Image.Name)
	}
	if len(g0.Details) != 2 {
		t.Fatalf("第 0 组副图应为 2 张，实际 %d", len(g0.Details))
	}
	if g0.Details[0].Name != "B" || g0.Details[1].Name != "E" {
		t.Fatalf("第 0 组副图顺序应为 [B, E]，实际 %s, %s", g0.Details[0].Name, g0.Details[1].Name)
	}

	g1 := groups[1]
	if g1.Image.Name != "C" {
		t.Fatalf("第 1 组主图应为 C，实际 %s", g1.Image.Name)
	}
	if len(g1.Details) != 1 || g1.Details[0].Name != "D" {
		t.Fatalf("第 1 组副图应为 [D]，实际 %d 张", len(g1.Details))
	}
}

// TestGroupSnapImagesOrphan 父引用指向失效行（不存在）时，该图按主图渲染，不丢图。
func TestGroupSnapImagesOrphan(t *testing.T) {
	s := &streetSnapService{img: imgurl.New("", "", "")}
	imgs := []model.StreetSnapImage{
		{ID: 1, Image: "A", Name: "A", IsDetail: 1, ParentImageID: 99}, // 父 99 不存在
		{ID: 2, Image: "B", Name: "B", IsDetail: 0, ParentImageID: 0},
	}
	flat, groups := s.groupSnapImages(imgs)
	if len(flat) != 2 || len(groups) != 2 {
		t.Fatalf("孤儿副图应自成主图：flat=%d groups=%d", len(flat), len(groups))
	}
	if groups[0].Image.Name != "A" || len(groups[0].Details) != 0 {
		t.Fatalf("A 应作为主图且无副图，实际 %s details=%d", groups[0].Image.Name, len(groups[0].Details))
	}
}