package templates

import (
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"testing"
	"time"

	"github.com/tamakyi/TamaBox/internal/conf"
	"github.com/tamakyi/TamaBox/internal/stats"
)

// TestGenPreview 仅用于本地肉眼核对样式改动，产出 outputs/preview-*.html。
// 不在 CI 里跑：需要 TEST_PREVIEW=1 才执行。
func TestGenPreview(t *testing.T) {
	if os.Getenv("TEST_PREVIEW") != "1" {
		t.Skip("set TEST_PREVIEW=1 to generate preview files")
	}
	outDir := filepath.Join("..", "outputs")
	if err := os.MkdirAll(outDir, 0o755); err != nil {
		t.Fatal(err)
	}

	base := map[string]interface{}{
		"LangCode":       "zh-CN",
		"SupportedLangs": []map[string]string{{"Code": "zh-CN", "Name": "简体中文"}, {"Code": "ja", "Name": "日本語"}, {"Code": "en", "Name": "English"}},
		"IsLogged":       false,
		"IsUserPage":     false,
		"IsPixel":        false,
		"VConsole":       false,
		"CurrentURI":     "/",
		"ExternalURL":    "https://box.shiroko.one",
		"CaptchaType":    "math",
		"Limits":         conf.Limits,
		"Title":          "TamaBox",
		"SiteStats": &stats.View{
			RegisteredUsers: 1284, TotalQuestions: 56321, AnsweredQuestions: 31208,
			LastQuestionAt: "2026-10-19 10:12:44",
			LastAnswerAt:   "2026-10-19 09:58:02",
			UpdatedAt:      "2026-10-19 10:00:00",
		},
	}

	for _, theme := range []string{"light", "dark"} {
		home, err := renderToString(t, "home", base)
		if err != nil {
			t.Fatalf("render home: %v", err)
		}
		writePreview(t, outDir, "preview-home-"+theme+".html", home, theme, "../static")
	}

	// 提问箱主页：带背景图（渐变占位）+ 浅色文字，验证遮罩方向
	boxData := publicBaseData()
	boxData["VConsole"] = false
	bgURI := "data:image/svg+xml;utf8," +
		strings.NewReplacer("#", "%23").Replace(
			`<svg xmlns='http://www.w3.org/2000/svg' width='900' height='500'><defs><linearGradient id='g' x1='0' y1='0' x2='1' y2='1'><stop offset='0' stop-color='#3b6ea5'/><stop offset='1' stop-color='#d98b6a'/></linearGradient></defs><rect width='900' height='500' fill='url(#g)'/></svg>`)
	// 注意：模板读的是 .PageUser.Background，必须写进 PageUser 里，否则 {{ if .PageUser.Background }} 为假、遮罩类不会渲染
	boxData["PageUser"].(map[string]interface{})["Background"] = bgURI
	boxData["PageUser"].(map[string]interface{})["Usernamecolor"] = "#ffffff"
	boxData["PageUser"].(map[string]interface{})["Introcolor"] = "#ffffff"
	// 无头 Chrome 里 uk-img 的懒加载不一定触发，这里直接把背景图写进 CSS 便于核对遮罩
	coverCSS := `<style>.tb-profile-cover{background-image:url("` + bgURI +
		`");background-size:cover;background-position:center;}</style>`
	for _, theme := range []string{"light", "dark"} {
		box, err := renderToString(t, "question/list", boxData)
		if err != nil {
			t.Fatalf("render list: %v", err)
		}
		box = strings.Replace(box, "</head>", coverCSS+"</head>", 1)
		writePreview(t, outDir, "preview-box-"+theme+".html", box, theme, "../static")
	}

	// 主题预览：与箱主页同一份数据，只是打开 sakura 主题（验证令牌覆盖与深色块）
	themeBox := publicBaseData()
	themeBox["VConsole"] = false
	themeBox["ThemeSlug"] = "sakura"
	themeBox["PageUser"].(map[string]interface{})["Background"] = bgURI
	themeBox["PageUser"].(map[string]interface{})["Usernamecolor"] = "#3a2b30"
	themeBox["PageUser"].(map[string]interface{})["Introcolor"] = "#6b545c"
	for _, theme := range []string{"light", "dark"} {
		page, err := renderToString(t, "question/list", themeBox)
		if err != nil {
			t.Fatalf("render themed list: %v", err)
		}
		page = inlineThemeCSS(t, page, "sakura")
		writePreview(t, outDir, "preview-theme-sakura-"+theme+".html", page, theme, "../static")
	}

	// 探索页：核对令牌替换后的卡片/列表配色
	explore := voteBaseData()
	explore["LangCode"] = "zh-CN"
	explore["IsUserPage"] = false
	explore["Keyword"] = ""
	explore["Sort"] = "latest"
	explore["Page"] = 1
	explore["TotalPages"] = 1
	explore["PrevPage"] = 0
	explore["NextPage"] = 2
	explore["HotTags"] = []string{"杂谈", "学习", "音乐"}
	explore["HotVotes"] = nil
	explore["AllVotes"] = nil
	explore["RecommendUsers"] = []interface{}{}
	explore["Users"] = []map[string]interface{}{
		{"Name": "小狼", "Domain": "tamakyi", "Avatar": "", "Intro": "随便问，友善一点，看到都会回。", "Tags": "杂谈,日常"},
		{"Name": "Kitsune", "Domain": "kitsune", "Avatar": "", "Intro": "摄影 / 音乐 / 一点点代码", "Tags": "摄影"},
		{"Name": "残响", "Domain": "echo", "Avatar": "", "Intro": "长期潜水，偶尔冒泡。", "Tags": "杂谈"},
		{"Name": "Mika", "Domain": "mika", "Avatar": "", "Intro": "想认识更多有趣的人。", "Tags": "学习,音乐"},
	}
	for _, theme := range []string{"light", "dark"} {
		page, err := renderToString(t, "user/explore", explore)
		if err != nil {
			t.Fatalf("render explore: %v", err)
		}
		writePreview(t, outDir, "preview-explore-"+theme+".html", page, theme, "../static")
	}

	// 设置页「内容防护」面板：核对是否与其它面板同样是白底卡片
	profile := profileBaseData()
	// 主题选择器（account 面板）：用固定假数据，避免测试依赖 conf 的 [theme] 段
	profile["Themes"] = []map[string]interface{}{
		{"Slug": "default", "Swatch": ""},
		{"Slug": "sakura", "Swatch": "linear-gradient(135deg, #fff6f8 0 55%, #e5678f 55% 100%)"},
	}
	profile["CurrentTheme"] = "sakura"
	profile["ActiveProfileTab"] = "security"
	profile["FeatureQuestion"] = nil
	profile["FeatureChat"] = nil
	profile["FeatureVote"] = nil
	for _, theme := range []string{"light", "dark"} {
		page, err := renderToString(t, "user/profile", profile)
		if err != nil {
			t.Fatalf("render profile: %v", err)
		}
		writePreview(t, outDir, "preview-profile-"+theme+".html", page, theme, "../static")
	}

	// 设置页「账号」面板：主题选择器的实际排版（卡片在面板末尾）
	profileAccount := profileBaseData()
	profileAccount["Themes"] = profile["Themes"]
	profileAccount["CurrentTheme"] = "sakura"
	profileAccount["ActiveProfileTab"] = "account"
	profileAccount["FeatureQuestion"] = nil
	profileAccount["FeatureChat"] = nil
	profileAccount["FeatureVote"] = nil
	for _, theme := range []string{"light"} {
		page, err := renderToString(t, "user/profile", profileAccount)
		if err != nil {
			t.Fatalf("render account profile: %v", err)
		}
		writePreview(t, outDir, "preview-profile-account-"+theme+".html", page, theme, "../static")
	}

	// 设置页在箱主主题下的样子：/user 后台现在也会跟随本人主题，
	// 需要确认「粉色页面 + 主题选择器」不会互相吃掉。
	profileSakura := profileBaseData()
	profileSakura["Themes"] = profile["Themes"]
	profileSakura["CurrentTheme"] = "sakura"
	profileSakura["ActiveProfileTab"] = "account"
	profileSakura["ThemeSlug"] = "sakura"
	profileSakura["FeatureQuestion"] = nil
	profileSakura["FeatureChat"] = nil
	profileSakura["FeatureVote"] = nil
	for _, theme := range []string{"light", "dark"} {
		page, err := renderToString(t, "user/profile", profileSakura)
		if err != nil {
			t.Fatalf("render themed profile: %v", err)
		}
		page = inlineThemeCSS(t, page, "sakura")
		writePreview(t, outDir, "preview-profile-sakura-"+theme+".html", page, theme, "../static")
	}
}

// inlineThemeCSS 把主题 <link> 换成内联 style：预览页走 file://，相对路径取不到。
// 预览数据里没有 StaticVersion，v 参数为空串，所以按正则匹配而不是固定串替换。
func inlineThemeCSS(t *testing.T, html, slug string) string {
	t.Helper()
	css, err := os.ReadFile(filepath.Join("..", "static", "css", "themes", slug+".css"))
	if err != nil {
		t.Fatalf("read theme css: %v", err)
	}
	link := regexp.MustCompile(`<link rel="stylesheet" href="/static/css/themes/` + slug + `\.css\?v=[^"]*"/>`)
	if !link.MatchString(html) {
		t.Fatalf("主题 %s 的 <link> 未出现在页面里（ThemeSlug 没传到模板）", slug)
	}
	return link.ReplaceAllString(html, "<style>"+string(css)+"</style>")
}

// writePreview 把 CDN 换成可直连的镜像、钉死主题，仅用于本地预览。
func writePreview(t *testing.T, dir, name, html, theme, staticPrefix string) {
	t.Helper()
	html = strings.ReplaceAll(html, "https://cdnjs.snrat.com/", "https://cdnjs.cloudflare.com/")
	if theme == "dark" {
		// <html> 上可能还有 data-theme-style，只在这个开标签内判断/插入；
		// 不能全文搜索 —— 内联的主题 css 里有 html[data-theme="dark"] 选择器
		if i := strings.Index(html, "<html"); i >= 0 {
			if j := strings.Index(html[i:], ">"); j > 0 {
				tag := html[i : i+j]
				if !strings.Contains(tag, "data-theme=") {
					html = html[:i+j] + ` data-theme="dark"` + html[i+j:]
				}
			}
		}
	}
	html = strings.ReplaceAll(html, `href="/favicon.ico"`, `href="`+staticPrefix+`/favicon.ico"`)
	html = strings.Replace(html, `<title>`, `<title>预览 `+time.Now().Format("15:04")+` · `, 1)
	if err := os.WriteFile(filepath.Join(dir, name), []byte(html), 0o644); err != nil {
		t.Fatal(err)
	}
}