package service

import (
	"context"
	"testing"

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

// fakeSnapRepo 只实现测试路径用到的仓储方法；其余由嵌入的接口兜底（测试中不会调到未实现的方法）。
type fakeSnapRepo struct {
	repository.StreetSnapRepository
	findByID   *model.StreetSnap
	listImages []model.StreetSnapImage
	rows       []model.StreetSnap
}

func (f *fakeSnapRepo) FindByID(_ context.Context, _ string) (*model.StreetSnap, error) {
	return f.findByID, nil
}

func (f *fakeSnapRepo) ListImages(_ context.Context, _ string) ([]model.StreetSnapImage, error) {
	return f.listImages, nil
}

func (f *fakeSnapRepo) List(_ context.Context, q dto.StreetSnapQuery) ([]model.StreetSnap, int64, error) {
	return f.rows, int64(len(f.rows)), nil
}

var _ repository.StreetSnapRepository = (*fakeSnapRepo)(nil)

func newSnapService(f *fakeSnapRepo) StreetSnapService {
	return NewStreetSnapService(f, nil, imgurl.New("", "", ""), nil, nil)
}

// TestStreetSnapDetailLocalizesTitle 详情按 locale 返回中/英标题。
func TestStreetSnapDetailLocalizesTitle(t *testing.T) {
	repo := &fakeSnapRepo{
		findByID:   &model.StreetSnap{ID: 1, Title: "London Street Style", TitleCn: "伦敦街拍", Cover: "c.jpg"},
		listImages: []model.StreetSnapImage{{ID: 1, Image: "a.jpg"}},
	}
	svc := newSnapService(repo)

	cn, err := svc.Detail(context.Background(), "1", "cn")
	if err != nil {
		t.Fatalf("Detail cn err: %v", err)
	}
	if cn.Title != "伦敦街拍" {
		t.Errorf("cn 标题应为中文，实际 %q", cn.Title)
	}

	en, err := svc.Detail(context.Background(), "1", "en")
	if err != nil {
		t.Fatalf("Detail en err: %v", err)
	}
	if en.Title != "London Street Style" {
		t.Errorf("en 标题应为英文，实际 %q", en.Title)
	}
}

// TestStreetSnapDetailFallsBackToEn 中文为空时回落英文。
func TestStreetSnapDetailFallsBackToEn(t *testing.T) {
	repo := &fakeSnapRepo{findByID: &model.StreetSnap{ID: 1, Title: "Only English", TitleCn: ""}}
	svc := newSnapService(repo)

	cn, err := svc.Detail(context.Background(), "1", "cn")
	if err != nil {
		t.Fatalf("Detail cn err: %v", err)
	}
	if cn.Title != "Only English" {
		t.Errorf("中文为空应回落英文，实际 %q", cn.Title)
	}
}

// TestStreetSnapListLocalizesTitle 列表按 locale 取标题，中文为空回落英文。
func TestStreetSnapListLocalizesTitle(t *testing.T) {
	repo := &fakeSnapRepo{rows: []model.StreetSnap{
		{ID: 1, Title: "EN A", TitleCn: "中 A"},
		{ID: 2, Title: "EN B", TitleCn: ""},
	}}
	svc := newSnapService(repo)

	got, _, err := svc.List(context.Background(), dto.StreetSnapQuery{Locale: "cn", Images: 0})
	if err != nil {
		t.Fatalf("List err: %v", err)
	}
	if len(got) != 2 {
		t.Fatalf("期望 2 条，实际 %d", len(got))
	}
	if got[0].Title != "中 A" || got[1].Title != "EN B" {
		t.Errorf("列表本地化错误: %#v", got)
	}
}