package configser

import (
	"fmt"
	"strings"
)

// HomeRoadLinkVM 是“回家的路”页面中的可访问线路。
type HomeRoadLinkVM struct {
	Label string
	URL   string
}

// HomeRoadContactVM 是防失联联系方式。
type HomeRoadContactVM struct {
	Title       string
	Description string
	Action      string
	URL         string
}

// HomeRoadPageVM 将 config/info 中的地址字段整理成页面所需结构。
type HomeRoadPageVM struct {
	MainURL   string
	Routes    []HomeRoadLinkVM
	Permanent []HomeRoadLinkVM
	Contacts  []HomeRoadContactVM
}

func firstHomeRoadURL(values ...string) string {
	for _, value := range values {
		if value = strings.TrimSpace(value); value != "" {
			return value
		}
	}
	return "/"
}

// BuildHomeRoadPageVM 使用服务端动态配置组装“回家的路”页面。
func BuildHomeRoadPageVM(cfg AppConfigVM) HomeRoadPageVM {
	mainURL := firstHomeRoadURL(cfg.NewURLAddr, cfg.ForeverURLAddr)
	routes := make([]HomeRoadLinkVM, 0, 3)
	for _, item := range cfg.NavPageList {
		if len(routes) == 3 {
			break
		}
		if url := strings.TrimSpace(item.URL); url != "" {
			routes = append(routes, HomeRoadLinkVM{Label: fmt.Sprintf("备用地址 %02d", len(routes)+1), URL: url})
		}
	}
	for _, url := range []string{cfg.NewURLAddr, cfg.NewURLAddr1, cfg.NewURLAddr2} {
		if len(routes) == 3 {
			break
		}
		if url = strings.TrimSpace(url); url != "" {
			routes = append(routes, HomeRoadLinkVM{Label: fmt.Sprintf("备用地址 %02d", len(routes)+1), URL: url})
		}
	}
	for len(routes) < 3 {
		routes = append(routes, HomeRoadLinkVM{Label: fmt.Sprintf("备用地址 %02d", len(routes)+1), URL: mainURL})
	}

	permanent := make([]HomeRoadLinkVM, 0, 3)
	for _, item := range []HomeRoadLinkVM{
		{Label: "永久地址", URL: cfg.ForeverURLAddr},
		{Label: "永久中转页", URL: cfg.NewURLAddr},
		{Label: "最新中转页（免翻墙）", URL: cfg.NewURLAddr1},
	} {
		item.URL = strings.TrimSpace(item.URL)
		if item.URL != "" {
			permanent = append(permanent, item)
		}
	}

	email := strings.TrimSpace(cfg.GmailAddr)
	emailURL := ""
	if email != "" {
		emailURL = "mailto:" + email
	}
	contacts := []HomeRoadContactVM{
		{Title: "✉  邮箱自动回复", Description: "发送任意邮件到下方地址，30秒内自动回复当前所有可用入口的最新汇总。", Action: firstHomeRoadURL(email, "huangguoaiai@gmail.com") + "   →", URL: firstHomeRoadURL(emailURL, "mailto:huangguoaiai@gmail.com")},
		{Title: "➤  TG 官方交流群", Description: "获取域名变更通知的首选渠道，实时播报并加入用户互助社区。", Action: "立即订阅最新动态   →", URL: firstHomeRoadURL(cfg.TGGroup, "/")},
		{Title: "◆  官方商务合作", Description: "联系官方商务合作，洽谈商务事宜，精诚合作，财富共赢。", Action: "立即联系   →", URL: firstHomeRoadURL(cfg.Telegram, "/")},
		{Title: "𝕏  推特社区", Description: "关注官方推特社区，第一时间获取地址变更与官方公告。", Action: "快速访问   →", URL: firstHomeRoadURL(cfg.TwitterAddr, "/")},
	}

	return HomeRoadPageVM{MainURL: mainURL, Routes: routes, Permanent: permanent, Contacts: contacts}
}