package service

import (
	"context"
	"errors"
	"testing"

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

// fakeGroupRepo 只实现分组相关的仓储方法，其余由嵌入的接口兜底（测试中不会调到未实现的方法）。
type fakeGroupRepo struct {
	repository.ReviewRepository
	images   []model.StreetSnapImage
	detail   *model.StreetSnap
	attachFn func(snapID, mainID uint32, imgIDs []uint32) error
}

func (f *fakeGroupRepo) StreetRecordDetail(_ context.Context, _ uint32) (*model.StreetSnap, error) {
	return f.detail, nil
}

func (f *fakeGroupRepo) StreetRecordImages(_ context.Context, _ uint32) ([]model.StreetSnapImage, error) {
	return f.images, nil
}

func (f *fakeGroupRepo) AttachStreetSnapImages(_ context.Context, snapID, mainID uint32, imgIDs []uint32) error {
	if f.attachFn != nil {
		return f.attachFn(snapID, mainID, imgIDs)
	}
	return nil
}

func (f *fakeGroupRepo) DetachStreetSnapImage(_ context.Context, _ uint32, _ uint32) error {
	if f.attachFn != nil {
		return f.attachFn(0, 0, nil)
	}
	return nil
}

var _ repository.ReviewRepository = (*fakeGroupRepo)(nil)

func newGroupService(f *fakeGroupRepo) ReviewService {
	return NewReviewService(f, nil, imgurl.New("", "", ""), nil)
}

// TestStreetGroupDetailExposesGrouping 详情必须输出可折叠分组：主图各成一组，副图归入主图。
func TestStreetGroupDetailExposesGrouping(t *testing.T) {
	repo := &fakeGroupRepo{
		detail: &model.StreetSnap{ID: 7, Title: "T", Year: 2026, City: "Beijing", Status: model.StatusPending},
		images: []model.StreetSnapImage{
			{ID: 1, Image: "main.jpg", Name: "main", SortOrder: 1, IsDetail: 0, ParentImageID: 0},
			{ID: 2, Image: "det.jpg", Name: "det", SortOrder: 2, IsDetail: 1, ParentImageID: 1},
			{ID: 3, Image: "solo.jpg", Name: "solo", SortOrder: 3, IsDetail: 0, ParentImageID: 0},
		},
	}
	svc := newGroupService(repo)
	v, err := svc.RecordDetail(context.Background(), dto.IngestKindStreet, 7)
	if err != nil {
		t.Fatalf("RecordDetail 失败: %v", err)
	}
	if len(v.Images) != 3 {
		t.Fatalf("Images 应保留扁平 3 张，实际 %d", len(v.Images))
	}
	if len(v.Groups) != 2 {
		t.Fatalf("Groups 应为 2 组，实际 %d", len(v.Groups))
	}
	if v.Groups[0].Image.ID != 1 || len(v.Groups[0].Details) != 1 {
		t.Fatalf("第 0 组应为 1 张主图 + 1 副图，实际 main=%d details=%d", v.Groups[0].Image.ID, len(v.Groups[0].Details))
	}
	if v.Groups[0].Image.DetailCount != 1 {
		t.Fatalf("主图 DetailCount 应为 1，实际 %d", v.Groups[0].Image.DetailCount)
	}
	if v.Groups[0].Details[0].ID != 2 {
		t.Fatalf("副图应为 id=2，实际 %d", v.Groups[0].Details[0].ID)
	}
	if v.Groups[1].Image.ID != 3 {
		t.Fatalf("第 1 组主图应为 id=3，实际 %d", v.Groups[1].Image.ID)
	}
}

// TestStreetGroupAttachDelegates 并入必须透传参数到仓储。
func TestStreetGroupAttachDelegates(t *testing.T) {
	var got struct {
		snapID uint32
		mainID uint32
		imgIDs []uint32
	}
	repo := &fakeGroupRepo{attachFn: func(snapID, mainID uint32, imgIDs []uint32) error {
		got.snapID, got.mainID, got.imgIDs = snapID, mainID, imgIDs
		return nil
	}}
	svc := newGroupService(repo)
	if err := svc.AttachImages(context.Background(), dto.IngestKindStreet, 7, 1, []uint32{2, 3}); err != nil {
		t.Fatalf("AttachImages 失败: %v", err)
	}
	if got.snapID != 7 || got.mainID != 1 || len(got.imgIDs) != 2 {
		t.Fatalf("参数透传错误: snapID=%d mainID=%d imgIDs=%v", got.snapID, got.mainID, got.imgIDs)
	}
}

// TestStreetGroupNonStreetRejected 走秀模块不允许主副图分组操作。
func TestStreetGroupNonStreetRejected(t *testing.T) {
	repo := &fakeGroupRepo{}
	svc := newGroupService(repo)
	if err := svc.AttachImages(context.Background(), dto.IngestKindRunway, 7, 1, []uint32{2}); !errors.Is(err, ErrInvalidImageGroup) {
		t.Fatalf("走秀并入应返回 ErrInvalidImageGroup，实际 %v", err)
	}
}

// TestStreetGroupPreventCrossRecord 仓储拦截跨记录主图后，service 翻成中文用户错误。
func TestStreetGroupPreventCrossRecord(t *testing.T) {
	repo := &fakeGroupRepo{attachFn: func(_, _ uint32, _ []uint32) error {
		return repository.ErrInvalidImageGroup
	}}
	svc := newGroupService(repo)
	err := svc.AttachImages(context.Background(), dto.IngestKindStreet, 7, 1, []uint32{2, 3})
	if err == nil {
		t.Fatal("跨记录应报错")
	}
	if err.Error() != "主图无效：它必须属于本条记录、未被删除，且自身是主图" {
		t.Fatalf("错误文案不符: %q", err.Error())
	}
}