package admin

import (
	"context"
	"errors"
	"testing"

	"oneblog/internal/model"
	"oneblog/internal/store"
)

func TestAttachLinkCard(t *testing.T) {
	old := linkFetch
	t.Cleanup(func() { linkFetch = old })

	t.Run("长文不动", func(t *testing.T) {
		called := false
		linkFetch = func(context.Context, string) (*model.LinkCard, error) {
			called = true
			return nil, nil
		}
		in := &model.PostInput{Kind: model.KindLong, ContentMd: "看 https://a.cn"}
		attachLinkCard(context.Background(), in, nil)
		if in.LinkCard != nil || called {
			t.Fatalf("长文不该抓取，card=%+v called=%v", in.LinkCard, called)
		}
	})

	t.Run("没链接则清空", func(t *testing.T) {
		linkFetch = func(context.Context, string) (*model.LinkCard, error) {
			t.Fatal("没链接不该抓")
			return nil, nil
		}
		in := &model.PostInput{Kind: model.KindShort, ContentMd: "纯文本一句"}
		attachLinkCard(context.Background(), in, &model.LinkCard{URL: "https://old.cn", Title: "旧"})
		if in.LinkCard == nil || !in.LinkCard.Empty() {
			t.Fatalf("应传空卡片清掉旧的，got %+v", in.LinkCard)
		}
	})

	t.Run("链接未变则沿用不重抓", func(t *testing.T) {
		linkFetch = func(context.Context, string) (*model.LinkCard, error) {
			t.Fatal("同一个链接不该重复抓")
			return nil, nil
		}
		cur := &model.LinkCard{URL: "https://a.cn", Title: "已抓过"}
		in := &model.PostInput{Kind: model.KindShort, ContentMd: "看 https://a.cn"}
		attachLinkCard(context.Background(), in, cur)
		if in.LinkCard != cur {
			t.Fatalf("应沿用旧卡片，got %+v", in.LinkCard)
		}
	})

	t.Run("新链接则抓取", func(t *testing.T) {
		var gotURL string
		linkFetch = func(_ context.Context, u string) (*model.LinkCard, error) {
			gotURL = u
			return &model.LinkCard{URL: u, Title: "新卡片"}, nil
		}
		in := &model.PostInput{Kind: model.KindShort, ContentMd: "换成 https://b.cn/x。"}
		attachLinkCard(context.Background(), in, &model.LinkCard{URL: "https://a.cn", Title: "旧"})
		if gotURL != "https://b.cn/x" {
			t.Fatalf("结尾标点没剪掉: %q", gotURL)
		}
		if in.LinkCard == nil || in.LinkCard.Title != "新卡片" {
			t.Fatalf("card=%+v", in.LinkCard)
		}
	})

	t.Run("抓取失败则清空", func(t *testing.T) {
		linkFetch = func(context.Context, string) (*model.LinkCard, error) {
			return nil, errors.New("timeout")
		}
		in := &model.PostInput{Kind: model.KindShort, ContentMd: "https://slow.cn"}
		attachLinkCard(context.Background(), in, &model.LinkCard{URL: "https://a.cn", Title: "旧"})
		if in.LinkCard == nil || !in.LinkCard.Empty() {
			t.Fatalf("失败应清空，got %+v", in.LinkCard)
		}
	})
}

func TestLinkCardRoundTrip(t *testing.T) {
	a, _ := newTestAPI(t)
	card := &model.LinkCard{URL: "https://example.cn/x", Title: "示例标题", Desc: "描述", Site: "example", Image: "https://cdn/i.png"}
	p, err := a.Store.Create(model.PostInput{Kind: model.KindShort, ContentMd: "看 https://example.cn/x",
		Status: model.StatusPublished, LinkCard: card})
	if err != nil {
		t.Fatal(err)
	}
	if p.LinkCard == nil || p.LinkCard.Title != "示例标题" || p.LinkCard.Image != "https://cdn/i.png" {
		t.Fatalf("创建后没读回卡片: %+v", p.LinkCard)
	}
	// 列表接口也要带上（时间线靠它渲染）
	page, err := a.Store.List(store.ListOptions{Page: 1, Size: 10})
	if err != nil {
		t.Fatal(err)
	}
	if len(page.Items) != 1 || page.Items[0].LinkCard == nil {
		t.Fatalf("列表未带卡片: %+v", page.Items)
	}
	// 空卡片 = 清空
	if _, err := a.Store.Update(p.ID, model.PostInput{LinkCard: &model.LinkCard{}}); err != nil {
		t.Fatal(err)
	}
	got, err := a.Store.Get(p.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.LinkCard != nil {
		t.Fatalf("应已清空，got %+v", got.LinkCard)
	}
}