package service

import "strings"

// botSignatures 爬虫 UA 特征（小写子串 → 展示名），覆盖搜索引擎 / SEO 工具 / AI 爬虫 / 命令行客户端
var botSignatures = []struct {
	token string
	name  string
}{
	{"googlebot", "Googlebot"},
	{"google-inspectiontool", "Google Inspection Tool"},
	{"apis-google", "Googlebot"},
	{"bingbot", "bingbot"},
	{"baiduspider", "Baiduspider"},
	{"sogou", "Sogou spider"},
	{"yisou", "YisouSpider"},
	{"360spider", "360Spider"},
	{"haosouspider", "HaosouSpider"},
	{"bytespider", "Bytespider"},
	{"duckduckbot", "DuckDuckBot"},
	{"applebot", "Applebot"},
	{"petalbot", "PetalBot"},
	{"yandexbot", "YandexBot"},
	{"semrushbot", "SemrushBot"},
	{"ahrefsbot", "AhrefsBot"},
	{"mj12bot", "MJ12bot"},
	{"dotbot", "DotBot"},
	{"gptbot", "GPTBot"},
	{"claudebot", "ClaudeBot"},
	{"claude-web", "ClaudeBot"},
	{"ccbot", "CCBot"},
	{"perplexitybot", "PerplexityBot"},
	{"amazonbot", "Amazonbot"},
	{"facebookexternalhit", "facebookexternalhit"},
	{"twitterbot", "Twitterbot"},
	{"slackbot", "Slackbot"},
	{"discordbot", "Discordbot"},
	{"linkedinbot", "LinkedInBot"},
	{"curl/", "curl"},
	{"wget", "Wget"},
	{"python-requests", "python-requests"},
	{"python-urllib", "python-urllib"},
	{"httpclient", "HTTP Client"},
	{"go-http-client", "Go-http-client"},
	{"java/", "Java Client"},
	{"okhttp", "OkHttp"},
	{"scrapy", "Scrapy"},
	{"headlesschrome", "HeadlessChrome"},
	{"puppeteer", "Puppeteer"},
	{"phantomjs", "PhantomJS"},
	{"bot;", "Bot"},
	{"spider", "Spider"},
	{"crawler", "Crawler"},
}

// ClassifyBot 根据 User-Agent 判定爬虫；命中返回爬虫展示名，否则返回空串。
// 纯小写包含匹配，便于单测。
func ClassifyBot(ua string) string {
	low := strings.ToLower(strings.TrimSpace(ua))
	if low == "" {
		return ""
	}
	for _, sig := range botSignatures {
		if strings.Contains(low, sig.token) {
			return sig.name
		}
	}
	return ""
}