// Copyright 2016 fatedier, fatedier@gmail.com
//
// 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 config

import (
	"fmt"
	"reflect"
	"strconv"
	"strings"

	"github.com/fatedier/frp/models/consts"
	"github.com/fatedier/frp/models/msg"
	"github.com/fatedier/frp/utils/util"

	ini "github.com/vaughan0/go-ini"
)

var (
	proxyConfTypeMap map[string]reflect.Type
)

func init() {
	proxyConfTypeMap = make(map[string]reflect.Type)
	proxyConfTypeMap[consts.TCPProxy] = reflect.TypeOf(TCPProxyConf{})
	proxyConfTypeMap[consts.TCPMuxProxy] = reflect.TypeOf(TCPMuxProxyConf{})
	proxyConfTypeMap[consts.UDPProxy] = reflect.TypeOf(UDPProxyConf{})
	proxyConfTypeMap[consts.HTTPProxy] = reflect.TypeOf(HTTPProxyConf{})
	proxyConfTypeMap[consts.HTTPSProxy] = reflect.TypeOf(HTTPSProxyConf{})
	proxyConfTypeMap[consts.STCPProxy] = reflect.TypeOf(STCPProxyConf{})
	proxyConfTypeMap[consts.XTCPProxy] = reflect.TypeOf(XTCPProxyConf{})
	proxyConfTypeMap[consts.SUDPProxy] = reflect.TypeOf(SUDPProxyConf{})
}

// NewConfByType creates a empty ProxyConf object by proxyType.
// If proxyType isn't exist, return nil.
func NewConfByType(proxyType string) ProxyConf {
	v, ok := proxyConfTypeMap[proxyType]
	if !ok {
		return nil
	}
	cfg := reflect.New(v).Interface().(ProxyConf)
	return cfg
}

type ProxyConf interface {
	GetBaseInfo() *BaseProxyConf
	UnmarshalFromMsg(pMsg *msg.NewProxy)
	UnmarshalFromIni(prefix string, name string, conf ini.Section) error
	MarshalToMsg(pMsg *msg.NewProxy)
	CheckForCli() error
	CheckForSvr(serverCfg ServerCommonConf) error
	Compare(conf ProxyConf) bool
}

func NewProxyConfFromMsg(pMsg *msg.NewProxy, serverCfg ServerCommonConf) (cfg ProxyConf, err error) {
	if pMsg.ProxyType == "" {
		pMsg.ProxyType = consts.TCPProxy
	}

	cfg = NewConfByType(pMsg.ProxyType)
	if cfg == nil {
		err = fmt.Errorf("proxy [%s] type [%s] error", pMsg.ProxyName, pMsg.ProxyType)
		return
	}
	cfg.UnmarshalFromMsg(pMsg)
	err = cfg.CheckForSvr(serverCfg)
	return
}

func NewProxyConfFromIni(prefix string, name string, section ini.Section) (cfg ProxyConf, err error) {
	proxyType := section["type"]
	if proxyType == "" {
		proxyType = consts.TCPProxy
		section["type"] = consts.TCPProxy
	}
	cfg = NewConfByType(proxyType)
	if cfg == nil {
		err = fmt.Errorf("proxy [%s] type [%s] error", name, proxyType)
		return
	}
	if err = cfg.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	if err = cfg.CheckForCli(); err != nil {
		return
	}
	return
}

// BaseProxyConf provides configuration info that is common to all proxy types.
type BaseProxyConf struct {
	// ProxyName is the name of this proxy.
	ProxyName string `json:"proxy_name"`
	// ProxyType specifies the type of this proxy. Valid values include "tcp",
	// "udp", "http", "https", "stcp", and "xtcp". By default, this value is
	// "tcp".
	ProxyType string `json:"proxy_type"`

	// UseEncryption controls whether or not communication with the server will
	// be encrypted. Encryption is done using the tokens supplied in the server
	// and client configuration. By default, this value is false.
	UseEncryption bool `json:"use_encryption"`
	// UseCompression controls whether or not communication with the server
	// will be compressed. By default, this value is false.
	UseCompression bool `json:"use_compression"`
	// Group specifies which group the proxy is a part of. The server will use
	// this information to load balance proxies in the same group. If the value
	// is "", this proxy will not be in a group. By default, this value is "".
	Group string `json:"group"`
	// GroupKey specifies a group key, which should be the same among proxies
	// of the same group. By default, this value is "".
	GroupKey string `json:"group_key"`

	// ProxyProtocolVersion specifies which protocol version to use. Valid
	// values include "v1", "v2", and "". If the value is "", a protocol
	// version will be automatically selected. By default, this value is "".
	ProxyProtocolVersion string `json:"proxy_protocol_version"`

	// BandwidthLimit limit the proxy bandwidth
	// 0 means no limit
	BandwidthLimit BandwidthQuantity `json:"bandwidth_limit"`

	// meta info for each proxy
	Metas map[string]string `json:"metas"`

	LocalSvrConf
	HealthCheckConf
}

func (cfg *BaseProxyConf) GetBaseInfo() *BaseProxyConf {
	return cfg
}

func (cfg *BaseProxyConf) compare(cmp *BaseProxyConf) bool {
	if cfg.ProxyName != cmp.ProxyName ||
		cfg.ProxyType != cmp.ProxyType ||
		cfg.UseEncryption != cmp.UseEncryption ||
		cfg.UseCompression != cmp.UseCompression ||
		cfg.Group != cmp.Group ||
		cfg.GroupKey != cmp.GroupKey ||
		cfg.ProxyProtocolVersion != cmp.ProxyProtocolVersion ||
		!cfg.BandwidthLimit.Equal(&cmp.BandwidthLimit) ||
		!reflect.DeepEqual(cfg.Metas, cmp.Metas) {
		return false
	}
	if !cfg.LocalSvrConf.compare(&cmp.LocalSvrConf) {
		return false
	}
	if !cfg.HealthCheckConf.compare(&cmp.HealthCheckConf) {
		return false
	}
	return true
}

func (cfg *BaseProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.ProxyName = pMsg.ProxyName
	cfg.ProxyType = pMsg.ProxyType
	cfg.UseEncryption = pMsg.UseEncryption
	cfg.UseCompression = pMsg.UseCompression
	cfg.Group = pMsg.Group
	cfg.GroupKey = pMsg.GroupKey
	cfg.Metas = pMsg.Metas
}

func (cfg *BaseProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) error {
	var (
		tmpStr string
		ok     bool
		err    error
	)
	cfg.ProxyName = prefix + name
	cfg.ProxyType = section["type"]

	tmpStr, ok = section["use_encryption"]
	if ok && tmpStr == "true" {
		cfg.UseEncryption = true
	}

	tmpStr, ok = section["use_compression"]
	if ok && tmpStr == "true" {
		cfg.UseCompression = true
	}

	cfg.Group = section["group"]
	cfg.GroupKey = section["group_key"]
	cfg.ProxyProtocolVersion = section["proxy_protocol_version"]

	if cfg.BandwidthLimit, err = NewBandwidthQuantity(section["bandwidth_limit"]); err != nil {
		return err
	}

	if err = cfg.LocalSvrConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return err
	}

	if err = cfg.HealthCheckConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return err
	}

	if cfg.HealthCheckType == "tcp" && cfg.Plugin == "" {
		cfg.HealthCheckAddr = cfg.LocalIP + fmt.Sprintf(":%d", cfg.LocalPort)
	}
	if cfg.HealthCheckType == "http" && cfg.Plugin == "" && cfg.HealthCheckURL != "" {
		s := fmt.Sprintf("http://%s:%d", cfg.LocalIP, cfg.LocalPort)
		if !strings.HasPrefix(cfg.HealthCheckURL, "/") {
			s += "/"
		}
		cfg.HealthCheckURL = s + cfg.HealthCheckURL
	}

	cfg.Metas = make(map[string]string)
	for k, v := range section {
		if strings.HasPrefix(k, "meta_") {
			cfg.Metas[strings.TrimPrefix(k, "meta_")] = v
		}
	}
	return nil
}

func (cfg *BaseProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	pMsg.ProxyName = cfg.ProxyName
	pMsg.ProxyType = cfg.ProxyType
	pMsg.UseEncryption = cfg.UseEncryption
	pMsg.UseCompression = cfg.UseCompression
	pMsg.Group = cfg.Group
	pMsg.GroupKey = cfg.GroupKey
	pMsg.Metas = cfg.Metas
}

func (cfg *BaseProxyConf) checkForCli() (err error) {
	if cfg.ProxyProtocolVersion != "" {
		if cfg.ProxyProtocolVersion != "v1" && cfg.ProxyProtocolVersion != "v2" {
			return fmt.Errorf("no support proxy protocol version: %s", cfg.ProxyProtocolVersion)
		}
	}

	if err = cfg.LocalSvrConf.checkForCli(); err != nil {
		return
	}
	if err = cfg.HealthCheckConf.checkForCli(); err != nil {
		return
	}
	return nil
}

// Bind info
type BindInfoConf struct {
	RemotePort int `json:"remote_port"`
}

func (cfg *BindInfoConf) compare(cmp *BindInfoConf) bool {
	if cfg.RemotePort != cmp.RemotePort {
		return false
	}
	return true
}

func (cfg *BindInfoConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.RemotePort = pMsg.RemotePort
}

func (cfg *BindInfoConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	var (
		tmpStr string
		ok     bool
		v      int64
	)
	if tmpStr, ok = section["remote_port"]; ok {
		if v, err = strconv.ParseInt(tmpStr, 10, 64); err != nil {
			return fmt.Errorf("Parse conf error: proxy [%s] remote_port error", name)
		}
		cfg.RemotePort = int(v)
	} else {
		return fmt.Errorf("Parse conf error: proxy [%s] remote_port not found", name)
	}
	return nil
}

func (cfg *BindInfoConf) MarshalToMsg(pMsg *msg.NewProxy) {
	pMsg.RemotePort = cfg.RemotePort
}

// Domain info
type DomainConf struct {
	CustomDomains []string `json:"custom_domains"`
	SubDomain     string   `json:"sub_domain"`
}

func (cfg *DomainConf) compare(cmp *DomainConf) bool {
	if strings.Join(cfg.CustomDomains, " ") != strings.Join(cmp.CustomDomains, " ") ||
		cfg.SubDomain != cmp.SubDomain {
		return false
	}
	return true
}

func (cfg *DomainConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.CustomDomains = pMsg.CustomDomains
	cfg.SubDomain = pMsg.SubDomain
}

func (cfg *DomainConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	var (
		tmpStr string
		ok     bool
	)
	if tmpStr, ok = section["custom_domains"]; ok {
		cfg.CustomDomains = strings.Split(tmpStr, ",")
		for i, domain := range cfg.CustomDomains {
			cfg.CustomDomains[i] = strings.ToLower(strings.TrimSpace(domain))
		}
	}

	if tmpStr, ok = section["subdomain"]; ok {
		cfg.SubDomain = tmpStr
	}
	return
}

func (cfg *DomainConf) MarshalToMsg(pMsg *msg.NewProxy) {
	pMsg.CustomDomains = cfg.CustomDomains
	pMsg.SubDomain = cfg.SubDomain
}

func (cfg *DomainConf) check() (err error) {
	if len(cfg.CustomDomains) == 0 && cfg.SubDomain == "" {
		err = fmt.Errorf("custom_domains and subdomain should set at least one of them")
		return
	}
	return
}

func (cfg *DomainConf) checkForCli() (err error) {
	if err = cfg.check(); err != nil {
		return
	}
	return
}

func (cfg *DomainConf) checkForSvr(serverCfg ServerCommonConf) (err error) {
	if err = cfg.check(); err != nil {
		return
	}

	for _, domain := range cfg.CustomDomains {
		if serverCfg.SubDomainHost != "" && len(strings.Split(serverCfg.SubDomainHost, ".")) < len(strings.Split(domain, ".")) {
			if strings.Contains(domain, serverCfg.SubDomainHost) {
				return fmt.Errorf("custom domain [%s] should not belong to subdomain_host [%s]", domain, serverCfg.SubDomainHost)
			}
		}
	}

	if cfg.SubDomain != "" {
		if serverCfg.SubDomainHost == "" {
			return fmt.Errorf("subdomain is not supported because this feature is not enabled in remote frps")
		}
		if strings.Contains(cfg.SubDomain, ".") || strings.Contains(cfg.SubDomain, "*") {
			return fmt.Errorf("'.' and '*' is not supported in subdomain")
		}
	}
	return
}

// LocalSvrConf configures what location the client will proxy to, or what
// plugin will be used.
type LocalSvrConf struct {
	// LocalIP specifies the IP address or host name to proxy to.
	LocalIP string `json:"local_ip"`
	// LocalPort specifies the port to proxy to.
	LocalPort int `json:"local_port"`

	// Plugin specifies what plugin should be used for proxying. If this value
	// is set, the LocalIp and LocalPort values will be ignored. By default,
	// this value is "".
	Plugin string `json:"plugin"`
	// PluginParams specify parameters to be passed to the plugin, if one is
	// being used. By default, this value is an empty map.
	PluginParams map[string]string `json:"plugin_params"`
}

func (cfg *LocalSvrConf) compare(cmp *LocalSvrConf) bool {
	if cfg.LocalIP != cmp.LocalIP ||
		cfg.LocalPort != cmp.LocalPort {
		return false
	}
	if cfg.Plugin != cmp.Plugin ||
		len(cfg.PluginParams) != len(cmp.PluginParams) {
		return false
	}
	for k, v := range cfg.PluginParams {
		value, ok := cmp.PluginParams[k]
		if !ok || v != value {
			return false
		}
	}
	return true
}

func (cfg *LocalSvrConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	cfg.Plugin = section["plugin"]
	cfg.PluginParams = make(map[string]string)
	if cfg.Plugin != "" {
		// get params begin with "plugin_"
		for k, v := range section {
			if strings.HasPrefix(k, "plugin_") {
				cfg.PluginParams[k] = v
			}
		}
	} else {
		if cfg.LocalIP = section["local_ip"]; cfg.LocalIP == "" {
			cfg.LocalIP = "127.0.0.1"
		}

		if tmpStr, ok := section["local_port"]; ok {
			if cfg.LocalPort, err = strconv.Atoi(tmpStr); err != nil {
				return fmt.Errorf("Parse conf error: proxy [%s] local_port error", name)
			}
		} else {
			return fmt.Errorf("Parse conf error: proxy [%s] local_port not found", name)
		}
	}
	return
}

func (cfg *LocalSvrConf) checkForCli() (err error) {
	if cfg.Plugin == "" {
		if cfg.LocalIP == "" {
			err = fmt.Errorf("local ip or plugin is required")
			return
		}
		if cfg.LocalPort <= 0 {
			err = fmt.Errorf("error local_port")
			return
		}
	}
	return
}

// HealthCheckConf configures health checking. This can be useful for load
// balancing purposes to detect and remove proxies to failing services.
type HealthCheckConf struct {
	// HealthCheckType specifies what protocol to use for health checking.
	// Valid values include "tcp", "http", and "". If this value is "", health
	// checking will not be performed. By default, this value is "".
	//
	// If the type is "tcp", a connection will be attempted to the target
	// server. If a connection cannot be established, the health check fails.
	//
	// If the type is "http", a GET request will be made to the endpoint
	// specified by HealthCheckURL. If the response is not a 200, the health
	// check fails.
	HealthCheckType string `json:"health_check_type"` // tcp | http
	// HealthCheckTimeoutS specifies the number of seconds to wait for a health
	// check attempt to connect. If the timeout is reached, this counts as a
	// health check failure. By default, this value is 3.
	HealthCheckTimeoutS int `json:"health_check_timeout_s"`
	// HealthCheckMaxFailed specifies the number of allowed failures before the
	// proxy is stopped. By default, this value is 1.
	HealthCheckMaxFailed int `json:"health_check_max_failed"`
	// HealthCheckIntervalS specifies the time in seconds between health
	// checks. By default, this value is 10.
	HealthCheckIntervalS int `json:"health_check_interval_s"`
	// HealthCheckURL specifies the address to send health checks to if the
	// health check type is "http".
	HealthCheckURL string `json:"health_check_url"`
	// HealthCheckAddr specifies the address to connect to if the health check
	// type is "tcp".
	HealthCheckAddr string `json:"-"`
}

func (cfg *HealthCheckConf) compare(cmp *HealthCheckConf) bool {
	if cfg.HealthCheckType != cmp.HealthCheckType ||
		cfg.HealthCheckTimeoutS != cmp.HealthCheckTimeoutS ||
		cfg.HealthCheckMaxFailed != cmp.HealthCheckMaxFailed ||
		cfg.HealthCheckIntervalS != cmp.HealthCheckIntervalS ||
		cfg.HealthCheckURL != cmp.HealthCheckURL {
		return false
	}
	return true
}

func (cfg *HealthCheckConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	cfg.HealthCheckType = section["health_check_type"]
	cfg.HealthCheckURL = section["health_check_url"]

	if tmpStr, ok := section["health_check_timeout_s"]; ok {
		if cfg.HealthCheckTimeoutS, err = strconv.Atoi(tmpStr); err != nil {
			return fmt.Errorf("Parse conf error: proxy [%s] health_check_timeout_s error", name)
		}
	}

	if tmpStr, ok := section["health_check_max_failed"]; ok {
		if cfg.HealthCheckMaxFailed, err = strconv.Atoi(tmpStr); err != nil {
			return fmt.Errorf("Parse conf error: proxy [%s] health_check_max_failed error", name)
		}
	}

	if tmpStr, ok := section["health_check_interval_s"]; ok {
		if cfg.HealthCheckIntervalS, err = strconv.Atoi(tmpStr); err != nil {
			return fmt.Errorf("Parse conf error: proxy [%s] health_check_interval_s error", name)
		}
	}
	return
}

func (cfg *HealthCheckConf) checkForCli() error {
	if cfg.HealthCheckType != "" && cfg.HealthCheckType != "tcp" && cfg.HealthCheckType != "http" {
		return fmt.Errorf("unsupport health check type")
	}
	if cfg.HealthCheckType != "" {
		if cfg.HealthCheckType == "http" && cfg.HealthCheckURL == "" {
			return fmt.Errorf("health_check_url is required for health check type 'http'")
		}
	}
	return nil
}

// TCP
type TCPProxyConf struct {
	BaseProxyConf
	BindInfoConf
}

func (cfg *TCPProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*TCPProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		!cfg.BindInfoConf.compare(&cmpConf.BindInfoConf) {
		return false
	}
	return true
}

func (cfg *TCPProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.BindInfoConf.UnmarshalFromMsg(pMsg)
}

func (cfg *TCPProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	if err = cfg.BindInfoConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	return
}

func (cfg *TCPProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	cfg.BindInfoConf.MarshalToMsg(pMsg)
}

func (cfg *TCPProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return err
	}
	return
}

func (cfg *TCPProxyConf) CheckForSvr(serverCfg ServerCommonConf) error { return nil }

// TCP Multiplexer
type TCPMuxProxyConf struct {
	BaseProxyConf
	DomainConf

	Multiplexer string `json:"multiplexer"`
}

func (cfg *TCPMuxProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*TCPMuxProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		!cfg.DomainConf.compare(&cmpConf.DomainConf) ||
		cfg.Multiplexer != cmpConf.Multiplexer {
		return false
	}
	return true
}

func (cfg *TCPMuxProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.DomainConf.UnmarshalFromMsg(pMsg)
	cfg.Multiplexer = pMsg.Multiplexer
}

func (cfg *TCPMuxProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	if err = cfg.DomainConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}

	cfg.Multiplexer = section["multiplexer"]
	if cfg.Multiplexer != consts.HTTPConnectTCPMultiplexer {
		return fmt.Errorf("parse conf error: proxy [%s] incorrect multiplexer [%s]", name, cfg.Multiplexer)
	}
	return
}

func (cfg *TCPMuxProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	cfg.DomainConf.MarshalToMsg(pMsg)
	pMsg.Multiplexer = cfg.Multiplexer
}

func (cfg *TCPMuxProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return err
	}
	if err = cfg.DomainConf.checkForCli(); err != nil {
		return err
	}
	if cfg.Multiplexer != consts.HTTPConnectTCPMultiplexer {
		return fmt.Errorf("parse conf error: incorrect multiplexer [%s]", cfg.Multiplexer)
	}
	return
}

func (cfg *TCPMuxProxyConf) CheckForSvr(serverCfg ServerCommonConf) (err error) {
	if cfg.Multiplexer != consts.HTTPConnectTCPMultiplexer {
		return fmt.Errorf("proxy [%s] incorrect multiplexer [%s]", cfg.ProxyName, cfg.Multiplexer)
	}

	if cfg.Multiplexer == consts.HTTPConnectTCPMultiplexer && serverCfg.TCPMuxHTTPConnectPort == 0 {
		return fmt.Errorf("proxy [%s] type [tcpmux] with multiplexer [httpconnect] requires tcpmux_httpconnect_port configuration", cfg.ProxyName)
	}

	if err = cfg.DomainConf.checkForSvr(serverCfg); err != nil {
		err = fmt.Errorf("proxy [%s] domain conf check error: %v", cfg.ProxyName, err)
		return
	}
	return
}

// UDP
type UDPProxyConf struct {
	BaseProxyConf
	BindInfoConf
}

func (cfg *UDPProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*UDPProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		!cfg.BindInfoConf.compare(&cmpConf.BindInfoConf) {
		return false
	}
	return true
}

func (cfg *UDPProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.BindInfoConf.UnmarshalFromMsg(pMsg)
}

func (cfg *UDPProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	if err = cfg.BindInfoConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	return
}

func (cfg *UDPProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	cfg.BindInfoConf.MarshalToMsg(pMsg)
}

func (cfg *UDPProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return
	}
	return
}

func (cfg *UDPProxyConf) CheckForSvr(serverCfg ServerCommonConf) error { return nil }

// HTTP
type HTTPProxyConf struct {
	BaseProxyConf
	DomainConf

	Locations         []string          `json:"locations"`
	HTTPUser          string            `json:"http_user"`
	HTTPPwd           string            `json:"http_pwd"`
	HostHeaderRewrite string            `json:"host_header_rewrite"`
	Headers           map[string]string `json:"headers"`
}

func (cfg *HTTPProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*HTTPProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		!cfg.DomainConf.compare(&cmpConf.DomainConf) ||
		strings.Join(cfg.Locations, " ") != strings.Join(cmpConf.Locations, " ") ||
		cfg.HostHeaderRewrite != cmpConf.HostHeaderRewrite ||
		cfg.HTTPUser != cmpConf.HTTPUser ||
		cfg.HTTPPwd != cmpConf.HTTPPwd ||
		len(cfg.Headers) != len(cmpConf.Headers) {
		return false
	}

	for k, v := range cfg.Headers {
		v2, ok := cmpConf.Headers[k]
		if !ok {
			return false
		}
		if v != v2 {
			return false
		}
	}
	return true
}

func (cfg *HTTPProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.DomainConf.UnmarshalFromMsg(pMsg)

	cfg.Locations = pMsg.Locations
	cfg.HostHeaderRewrite = pMsg.HostHeaderRewrite
	cfg.HTTPUser = pMsg.HTTPUser
	cfg.HTTPPwd = pMsg.HTTPPwd
	cfg.Headers = pMsg.Headers
}

func (cfg *HTTPProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	if err = cfg.DomainConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}

	var (
		tmpStr string
		ok     bool
	)
	if tmpStr, ok = section["locations"]; ok {
		cfg.Locations = strings.Split(tmpStr, ",")
	} else {
		cfg.Locations = []string{""}
	}

	cfg.HostHeaderRewrite = section["host_header_rewrite"]
	cfg.HTTPUser = section["http_user"]
	cfg.HTTPPwd = section["http_pwd"]
	cfg.Headers = make(map[string]string)

	for k, v := range section {
		if strings.HasPrefix(k, "header_") {
			cfg.Headers[strings.TrimPrefix(k, "header_")] = v
		}
	}
	return
}

func (cfg *HTTPProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	cfg.DomainConf.MarshalToMsg(pMsg)

	pMsg.Locations = cfg.Locations
	pMsg.HostHeaderRewrite = cfg.HostHeaderRewrite
	pMsg.HTTPUser = cfg.HTTPUser
	pMsg.HTTPPwd = cfg.HTTPPwd
	pMsg.Headers = cfg.Headers
}

func (cfg *HTTPProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return
	}
	if err = cfg.DomainConf.checkForCli(); err != nil {
		return
	}
	return
}

func (cfg *HTTPProxyConf) CheckForSvr(serverCfg ServerCommonConf) (err error) {
	if serverCfg.VhostHTTPPort == 0 {
		return fmt.Errorf("type [http] not support when vhost_http_port is not set")
	}
	if err = cfg.DomainConf.checkForSvr(serverCfg); err != nil {
		err = fmt.Errorf("proxy [%s] domain conf check error: %v", cfg.ProxyName, err)
		return
	}
	return
}

// HTTPS
type HTTPSProxyConf struct {
	BaseProxyConf
	DomainConf
}

func (cfg *HTTPSProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*HTTPSProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		!cfg.DomainConf.compare(&cmpConf.DomainConf) {
		return false
	}
	return true
}

func (cfg *HTTPSProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.DomainConf.UnmarshalFromMsg(pMsg)
}

func (cfg *HTTPSProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	if err = cfg.DomainConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	return
}

func (cfg *HTTPSProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	cfg.DomainConf.MarshalToMsg(pMsg)
}

func (cfg *HTTPSProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return
	}
	if err = cfg.DomainConf.checkForCli(); err != nil {
		return
	}
	return
}

func (cfg *HTTPSProxyConf) CheckForSvr(serverCfg ServerCommonConf) (err error) {
	if serverCfg.VhostHTTPSPort == 0 {
		return fmt.Errorf("type [https] not support when vhost_https_port is not set")
	}
	if err = cfg.DomainConf.checkForSvr(serverCfg); err != nil {
		err = fmt.Errorf("proxy [%s] domain conf check error: %v", cfg.ProxyName, err)
		return
	}
	return
}

// SUDP
type SUDPProxyConf struct {
	BaseProxyConf

	Role string `json:"role"`
	Sk   string `json:"sk"`
}

func (cfg *SUDPProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*SUDPProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		cfg.Role != cmpConf.Role ||
		cfg.Sk != cmpConf.Sk {
		return false
	}
	return true
}

func (cfg *SUDPProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}

	cfg.Role = section["role"]
	if cfg.Role != "server" {
		return fmt.Errorf("Parse conf error: proxy [%s] incorrect role [%s]", name, cfg.Role)
	}

	cfg.Sk = section["sk"]

	if err = cfg.LocalSvrConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	return
}

func (cfg *SUDPProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	pMsg.Sk = cfg.Sk
}

func (cfg *SUDPProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return
	}
	if cfg.Role != "server" {
		err = fmt.Errorf("role should be 'server'")
		return
	}
	return
}

func (cfg *SUDPProxyConf) CheckForSvr(serverCfg ServerCommonConf) (err error) {
	return
}

// Only for role server.
func (cfg *SUDPProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.Sk = pMsg.Sk
}

// STCP
type STCPProxyConf struct {
	BaseProxyConf

	Role string `json:"role"`
	Sk   string `json:"sk"`
}

func (cfg *STCPProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*STCPProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		cfg.Role != cmpConf.Role ||
		cfg.Sk != cmpConf.Sk {
		return false
	}
	return true
}

// Only for role server.
func (cfg *STCPProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.Sk = pMsg.Sk
}

func (cfg *STCPProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}

	cfg.Role = section["role"]
	if cfg.Role != "server" {
		return fmt.Errorf("Parse conf error: proxy [%s] incorrect role [%s]", name, cfg.Role)
	}

	cfg.Sk = section["sk"]

	if err = cfg.LocalSvrConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	return
}

func (cfg *STCPProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	pMsg.Sk = cfg.Sk
}

func (cfg *STCPProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return
	}
	if cfg.Role != "server" {
		err = fmt.Errorf("role should be 'server'")
		return
	}
	return
}

func (cfg *STCPProxyConf) CheckForSvr(serverCfg ServerCommonConf) (err error) {
	return
}

// XTCP
type XTCPProxyConf struct {
	BaseProxyConf

	Role string `json:"role"`
	Sk   string `json:"sk"`
}

func (cfg *XTCPProxyConf) Compare(cmp ProxyConf) bool {
	cmpConf, ok := cmp.(*XTCPProxyConf)
	if !ok {
		return false
	}

	if !cfg.BaseProxyConf.compare(&cmpConf.BaseProxyConf) ||
		!cfg.LocalSvrConf.compare(&cmpConf.LocalSvrConf) ||
		cfg.Role != cmpConf.Role ||
		cfg.Sk != cmpConf.Sk {
		return false
	}
	return true
}

// Only for role server.
func (cfg *XTCPProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.UnmarshalFromMsg(pMsg)
	cfg.Sk = pMsg.Sk
}

func (cfg *XTCPProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) (err error) {
	if err = cfg.BaseProxyConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}

	cfg.Role = section["role"]
	if cfg.Role != "server" {
		return fmt.Errorf("Parse conf error: proxy [%s] incorrect role [%s]", name, cfg.Role)
	}

	cfg.Sk = section["sk"]

	if err = cfg.LocalSvrConf.UnmarshalFromIni(prefix, name, section); err != nil {
		return
	}
	return
}

func (cfg *XTCPProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
	cfg.BaseProxyConf.MarshalToMsg(pMsg)
	pMsg.Sk = cfg.Sk
}

func (cfg *XTCPProxyConf) CheckForCli() (err error) {
	if err = cfg.BaseProxyConf.checkForCli(); err != nil {
		return
	}
	if cfg.Role != "server" {
		err = fmt.Errorf("role should be 'server'")
		return
	}
	return
}

func (cfg *XTCPProxyConf) CheckForSvr(serverCfg ServerCommonConf) (err error) {
	return
}

func ParseRangeSection(name string, section ini.Section) (sections map[string]ini.Section, err error) {
	localPorts, errRet := util.ParseRangeNumbers(section["local_port"])
	if errRet != nil {
		err = fmt.Errorf("Parse conf error: range section [%s] local_port invalid, %v", name, errRet)
		return
	}

	remotePorts, errRet := util.ParseRangeNumbers(section["remote_port"])
	if errRet != nil {
		err = fmt.Errorf("Parse conf error: range section [%s] remote_port invalid, %v", name, errRet)
		return
	}
	if len(localPorts) != len(remotePorts) {
		err = fmt.Errorf("Parse conf error: range section [%s] local ports number should be same with remote ports number", name)
		return
	}
	if len(localPorts) == 0 {
		err = fmt.Errorf("Parse conf error: range section [%s] local_port and remote_port is necessary", name)
		return
	}

	sections = make(map[string]ini.Section)
	for i, port := range localPorts {
		subName := fmt.Sprintf("%s_%d", name, i)
		subSection := copySection(section)
		subSection["local_port"] = fmt.Sprintf("%d", port)
		subSection["remote_port"] = fmt.Sprintf("%d", remotePorts[i])
		sections[subName] = subSection
	}
	return
}

// if len(startProxy) is 0, start all
// otherwise just start proxies in startProxy map
func LoadAllConfFromIni(prefix string, content string, startProxy map[string]struct{}) (
	proxyConfs map[string]ProxyConf, visitorConfs map[string]VisitorConf, err error) {

	conf, errRet := ini.Load(strings.NewReader(content))
	if errRet != nil {
		err = errRet
		return
	}

	if prefix != "" {
		prefix += "."
	}

	startAll := true
	if len(startProxy) > 0 {
		startAll = false
	}
	proxyConfs = make(map[string]ProxyConf)
	visitorConfs = make(map[string]VisitorConf)
	for name, section := range conf {
		if name == "common" {
			continue
		}

		_, shouldStart := startProxy[name]
		if !startAll && !shouldStart {
			continue
		}

		subSections := make(map[string]ini.Section)

		if strings.HasPrefix(name, "range:") {
			// range section
			rangePrefix := strings.TrimSpace(strings.TrimPrefix(name, "range:"))
			subSections, err = ParseRangeSection(rangePrefix, section)
			if err != nil {
				return
			}
		} else {
			subSections[name] = section
		}

		for subName, subSection := range subSections {
			if subSection["role"] == "" {
				subSection["role"] = "server"
			}
			role := subSection["role"]
			if role == "server" {
				cfg, errRet := NewProxyConfFromIni(prefix, subName, subSection)
				if errRet != nil {
					err = errRet
					return
				}
				proxyConfs[prefix+subName] = cfg
			} else if role == "visitor" {
				cfg, errRet := NewVisitorConfFromIni(prefix, subName, subSection)
				if errRet != nil {
					err = errRet
					return
				}
				visitorConfs[prefix+subName] = cfg
			} else {
				err = fmt.Errorf("role should be 'server' or 'visitor'")
				return
			}
		}
	}
	return
}

func copySection(section ini.Section) (out ini.Section) {
	out = make(ini.Section)
	for k, v := range section {
		out[k] = v
	}
	return
}