package main

import (
	"strings"
)

type clientTag struct {
	AppName string
	Version string
}

func parseVersion(ver string) clientTag {
	// Try our best to turn the supplied text into a structured version
	ret := clientTag{
		AppName: APP_NAME,
		Version: APP_VERSION,
	}

	// Special case: Some clients use a structured version AppName:Version:Metadata
	// If we check for that, we can support clients with spaces in the name
	if cParts := strings.Split(ver, ":"); len(cParts) == 3 {
		ret.AppName = cParts[0]
		ret.Version = cParts[1]

	} else {

		// Special cases all failed, time for heuristics
		// Turn colons to spaces; keep the first word, and the the first word containing digits
		ver = strings.Trim(strings.Replace(ver, ":", " ", -1), " ")

		words := strings.Split(ver, " ")

		for _, word := range words[1:] {
			if strings.ContainsAny(word, "0123456789") {
				ret.AppName = words[0]
				ret.Version = strings.Replace(word, "(", "", -1) // AndroIRC
				break
			}
		}
	}

	// Strip leading v from mIRC
	if len(ret.Version) >= 2 && (ret.Version[0] == 'v' || ret.Version[0] == 'V') && strings.ContainsAny(string(ret.Version[1]), "0123456789") {
		ret.Version = ret.Version[1:]
	}

	// Special case: "Relay" means "HoloIRC"
	if ret.AppName == "Relay" && ret.Version == "1.0" && strings.Contains(ver, "Android") {
		ret.AppName = "HoloIRC"
		ret.Version = "4"
	}

	return ret
}