// Copyright 2020 The casbin Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package util

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"strings"

	"github.com/astaxie/beego/context"
	"github.com/astaxie/beego/logs"
)

func GetIPInfo(clientIP string) string {
	if clientIP == "" {
		return ""
	}

	ips := strings.Split(clientIP, ",")
	res := ""
	for i := range ips {
		ip := strings.TrimSpace(ips[i])
		desc := "" // GetDescFromIP(ip)
		ipstr := fmt.Sprintf("%s: %s", ip, desc)
		if i != len(ips) - 1 {
			res += ipstr + " -> "
		} else {
			res += ipstr
		}
	}

	return res
}

func getIPFromRequest(req *http.Request) string {
	clientIP := req.Header.Get("x-forwarded-for")
	if clientIP == "" {
		ipPort := strings.Split(req.RemoteAddr, ":")
		if len(ipPort) >= 1 && len(ipPort) <= 2 {
			clientIP = ipPort[0]
		} else if len(ipPort) > 2 {
			idx := strings.LastIndex(req.RemoteAddr, ":")
			clientIP = req.RemoteAddr[0:idx]
			clientIP = strings.TrimLeft(clientIP, "[")
			clientIP = strings.TrimRight(clientIP, "]")
		}
	}

	return GetIPInfo(clientIP)
}

func LogInfo(ctx *context.Context, f string, v ...interface{}) {
	ipString := fmt.Sprintf("(%s) ", getIPFromRequest(ctx.Request))
	logs.Info(ipString + f, v...)
}

func LogWarning(ctx *context.Context, f string, v ...interface{}) {
	ipString := fmt.Sprintf("(%s) ", getIPFromRequest(ctx.Request))
	logs.Warning(ipString + f, v...)
}

func ReadLog() []string {
	f, err := os.Open("logs/casnode.log")
	if err != nil {
		panic(err)
	}

	bytes, err := ioutil.ReadAll(f)
	if err != nil {
		panic(err)
	}

	return strings.Split(string(bytes), "\n")
}
