package main

import (
	"crypto/md5"
	"fmt"
	"io"
	"log"
	"net"
	"net/http"
	"strings"
)

// Hashs and returns a string (md5)
func Md5Hash(content string) string {
	h := md5.New()
	io.WriteString(h, content)
	hash := fmt.Sprintf("%x", h.Sum(nil))

	return hash
}

// Checks for equality in strings and returns true all are equal
func CompareStrings(strs ...string) bool {
	for k, _ := range strs {
		if k < len(strs)-1 {
			if strs[k] != strs[k+1] {
				return false
			}
		}
	}
	return true
}

func GetLanguage(r *http.Request) string {
	c, err := r.Cookie("lang")
	if err != nil {
		log.Println("Info: Cookie: lang", err)
	} else {
		if c.Value != "" {
			if c.Value == "de" {
				return c.Value
			} else {
				return ""
			}
		}
	}
	if len(r.Header["Accept-Language"]) == 0 {
		return ""
	}
	lang := r.Header["Accept-Language"][0]
	l := strings.TrimSpace(strings.Split(lang, ",")[0])
	if l == "de" {
		return l
	}
	return ""
}

func GetIP(r *http.Request) string {
	if len(r.Header["X-Forwarded-For"]) > 0 {
		return r.Header["X-Forwarded-For"][0]
	}
	if len(r.Header["X-Real-Ip"]) > 0 {
		return r.Header["X-Real-Ip"][0]
	}
	if r.RemoteAddr != "" {
		ip, _, err := net.SplitHostPort(r.RemoteAddr)
		if err != nil {
			log.Println("Info: ", err)
			return "0.0.0.0"
		}
		return ip
	}
	log.Println("Info: No remote IP detectable.")
	return "0.0.0.0"
}