package admin

import (
	"strings"
	"testing"

	"oneblog/internal/model"
)

func TestSummarizeMarkdown(t *testing.T) {
	md := "## 标题\n\n这是**正文**的第一段，含[链接](https://x.com)与图片：\n\n![封面](https://a.com/1.png)\n\n```go\ncode ignored\n```\n\n后续内容"
	got := summarizeMarkdown(md, 110)
	for _, bad := range []string{"#", "**", "![]", "```", "code ignored"} {
		if strings.Contains(got, bad) {
			t.Errorf("summary 含语法残留 %q: %q", bad, got)
		}
	}
	if !strings.Contains(got, "链接") || !strings.HasPrefix(got, "这是") {
		t.Errorf("summary 应以正文开头并保留链接文字: %q", got)
	}
	long := strings.Repeat("长", 200)
	if got := summarizeMarkdown(long, 110); len([]rune(got)) != 111 || !strings.HasSuffix(got, "…") {
		t.Errorf("超长应截到 110+省略号, got %d runes", len([]rune(got)))
	}
}

func TestFirstImage(t *testing.T) {
	md := "前言\n\n![封面](https://a.com/1.png)\n\n![第二张](https://a.com/2.png)"
	if got := firstImage(md); got != "https://a.com/1.png" {
		t.Errorf("firstImage = %q", got)
	}
	if got := firstImage("没有图片"); got != "" {
		t.Errorf("无图应返回空, got %q", got)
	}
}

func TestAutoMeta(t *testing.T) {
	in := model.PostInput{Kind: model.KindLong, ContentMd: "# T\n\n正文内容 ![图](https://a.com/x.png)"}
	autoMeta(&in, nil)
	if in.Summary == "" || in.CoverURL != "https://a.com/x.png" {
		t.Errorf("空字段应自动填充: summary=%q cover=%q", in.Summary, in.CoverURL)
	}
	// 站主已填的不能覆盖
	in2 := model.PostInput{Kind: model.KindLong, ContentMd: "正文", Summary: "手写的", CoverURL: ""}
	autoMeta(&in2, nil)
	if in2.Summary != "手写的" {
		t.Errorf("手写摘要不应被覆盖: %q", in2.Summary)
	}
	// 更新路径：新值与旧值都空才补——主动清空的保得住
	cleared := model.PostInput{Kind: model.KindLong, ContentMd: "正文", Summary: "", CoverURL: ""}
	cur := model.Post{Summary: "旧摘要", CoverURL: "旧封面"}
	autoMeta(&cleared, &cur)
	if cleared.Summary != "" || cleared.CoverURL != "" {
		t.Errorf("主动清空不应复活: summary=%q cover=%q", cleared.Summary, cleared.CoverURL)
	}
	// 新旧都空 → 生成
	never := model.PostInput{Kind: model.KindLong, ContentMd: "正文 ![图](/uploads/a.png)"}
	autoMeta(&never, &model.Post{})
	if never.CoverURL != "/uploads/a.png" {
		t.Errorf("新旧都空应取首图: %q", never.CoverURL)
	}
}