package service

import (
	"testing"

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

// TestBuildSnapImages 验证公开详情的 image 只含主图、副图嵌套在其主图的 Detail 下，
// 且「副图的副图」上浮归并到该副图所在组的主图。
//
//	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 images 只有 2 张主图：A(Detail=[B,E])、C(Detail=[D])。
func TestBuildSnapImages(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
	}

	out := s.buildSnapImages(imgs)
	if len(out) != 2 {
		t.Fatalf("images 应只含 2 张主图，实际 %d", len(out))
	}

	a := out[0]
	if a.Name != "A" || a.IsDetail != 0 {
		t.Fatalf("第 1 张应为 A 主图，实际 name=%s is_detail=%d", a.Name, a.IsDetail)
	}
	if len(a.Detail) != 2 || a.Detail[0].Name != "B" || a.Detail[1].Name != "E" {
		t.Fatalf("A 的副图应依序为 [B,E]，实际 %d 张", len(a.Detail))
	}
	for _, d := range a.Detail {
		if d.IsDetail != 1 {
			t.Fatalf("副图 %s 的 is_detail 应为 1，实际 %d", d.Name, d.IsDetail)
		}
	}

	c := out[1]
	if c.Name != "C" {
		t.Fatalf("第 2 张应为 C 主图，实际 name=%s", c.Name)
	}
	if len(c.Detail) != 1 || c.Detail[0].Name != "D" {
		t.Fatalf("C 的副图应为 [D]，实际 %d 张", len(c.Detail))
	}
}

// TestBuildSnapImagesOrphan 父引用指向失效行（不存在）时，该图按主图渲染，不丢图。
func TestBuildSnapImagesOrphan(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},
	}
	out := s.buildSnapImages(imgs)
	if len(out) != 2 {
		t.Fatalf("孤儿副图应自成主图：images=%d", len(out))
	}
	if out[0].Name != "A" || out[0].IsDetail != 0 || len(out[0].Detail) != 0 {
		t.Fatalf("A 应作为无副图的主图，实际 name=%s is_detail=%d details=%d", out[0].Name, out[0].IsDetail, len(out[0].Detail))
	}
}