package utils

import (
	"easyProxy/utils"
	"encoding/csv"
	"errors"
	"github.com/astaxie/beego"
	"log"
	"os"
	"strconv"
	"sync"
)

var (
	CsvDb *Csv
	once  sync.Once
)

type Flow struct {
	ExportFlow int64 //出口流量
	InletFlow  int64 //入口流量
}

type Client struct {
	Cnf       *ServerConfig
	Id        int    //id
	VerifyKey string //验证密钥
	Addr      string //客户端ip地址
	Remark    string //备注
	Status    bool   //是否开启
	IsConnect bool   //是否连接
	Flow      *Flow
}

type ServerConfig struct {
	TcpPort        int //服务端与客户端通信端口
	VerifyKey      string
	Mode           string //启动方式
	Target         string //目标
	U              string //socks5验证用户名
	P              string //socks5验证密码
	Compress       string //压缩方式
	Start          int    //是否开启
	IsRun          int    //是否在运行
	ClientStatus   int    //客s户端状态
	Crypt          bool   //是否加密
	Mux            bool   //是否加密
	CompressEncode int    //加密方式
	CompressDecode int    //解密方式
	Id             int    //Id
	ClientId       int    //所属客户端id
	UseClientCnf   bool   //是否继承客户端配置
	Flow           *Flow
	Remark         string //备注
}

type HostList struct {
	ClientId     int    //服务端与客户端通信端口
	Host         string //启动方式
	Target       string //目标
	HeaderChange string //host修改
	HostChange   string //host修改
	Flow         *Flow
	Remark       string //备注
}

func NewCsv() *Csv {
	c := new(Csv)
	return c
}

type Csv struct {
	Tasks            []*ServerConfig
	Path             string
	Hosts            []*HostList //域名列表
	Clients          []*Client   //客户端
	ClientIncreaseId int         //客户端id
	TaskIncreaseId   int         //任务自增ID
	sync.Mutex
}

func (s *Csv) Init() {
	s.LoadTaskFromCsv()
	s.LoadHostFromCsv()
	s.LoadClientFromCsv()
}

func (s *Csv) StoreTasksToCsv() {
	// 创建文件
	csvFile, err := os.Create(beego.AppPath + "/conf/tasks.csv")
	if err != nil {
		log.Fatalf(err.Error())
	}
	defer csvFile.Close()
	writer := csv.NewWriter(csvFile)
	for _, task := range s.Tasks {
		record := []string{
			strconv.Itoa(task.TcpPort),
			task.Mode,
			task.Target,
			task.U,
			task.P,
			task.Compress,
			strconv.Itoa(task.Start),
			GetStrByBool(task.Crypt),
			GetStrByBool(task.Mux),
			strconv.Itoa(task.CompressEncode),
			strconv.Itoa(task.CompressDecode),
			strconv.Itoa(task.Id),
			strconv.Itoa(task.ClientId),
			strconv.FormatBool(task.UseClientCnf),
			task.Remark,
		}
		err := writer.Write(record)
		if err != nil {
			log.Fatalf(err.Error())
		}
	}
	writer.Flush()
}

func (s *Csv) openFile(path string) ([][]string, error) {
	// 打开文件
	file, err := os.Open(path)
	if err != nil {
		panic(err)
	}
	defer file.Close()

	// 获取csv的reader
	reader := csv.NewReader(file)

	// 设置FieldsPerRecord为-1
	reader.FieldsPerRecord = -1

	// 读取文件中所有行保存到slice中
	return reader.ReadAll()
}

func (s *Csv) LoadTaskFromCsv() {
	path := beego.AppPath + "/conf/tasks.csv"
	records, err := s.openFile(path)
	if err != nil {
		log.Fatal("配置文件打开错误:", path)
	}
	var tasks []*ServerConfig
	// 将每一行数据保存到内存slice中
	for _, item := range records {
		post := &ServerConfig{
			TcpPort:        GetIntNoErrByStr(item[0]),
			Mode:           item[1],
			Target:         item[2],
			U:              item[3],
			P:              item[4],
			Compress:       item[5],
			Start:          GetIntNoErrByStr(item[6]),
			Crypt:          GetBoolByStr(item[7]),
			Mux:            GetBoolByStr(item[8]),
			CompressEncode: GetIntNoErrByStr(item[9]),
			CompressDecode: GetIntNoErrByStr(item[10]),
			Id:             GetIntNoErrByStr(item[11]),
			ClientId:       GetIntNoErrByStr(item[12]),
			UseClientCnf:   GetBoolByStr(item[13]),
			Remark:         item[14],
		}
		post.Flow = new(Flow)
		tasks = append(tasks, post)
		if post.Id > s.TaskIncreaseId {
			s.TaskIncreaseId = post.Id
		}
	}
	s.Tasks = tasks
}

func (s *Csv) GetTaskId() int {
	s.Lock()
	defer s.Unlock()
	s.TaskIncreaseId++
	return s.TaskIncreaseId
}

func (s *Csv) GetIdByVerifyKey(vKey string, addr string) (int, error) {
	s.Lock()
	defer s.Unlock()
	for _, v := range s.Clients {
		if utils.Getverifyval(v.VerifyKey) == vKey && v.Status {
			v.Addr = addr
			return v.Id, nil
		}
	}
	return 0, errors.New("not found")
}

func (s *Csv) NewTask(t *ServerConfig) {
	t.Flow = new(Flow)
	s.Tasks = append(s.Tasks, t)
	s.StoreTasksToCsv()
}

func (s *Csv) UpdateTask(t *ServerConfig) error {
	for k, v := range s.Tasks {
		if v.Id == t.Id {
			s.Tasks = append(s.Tasks[:k], s.Tasks[k+1:]...)
			s.Tasks = append(s.Tasks, t)
			s.StoreTasksToCsv()
			return nil
		}
	}
	return errors.New("不存在")
}

func (s *Csv) DelTask(id int) error {
	for k, v := range s.Tasks {
		if v.Id == id {
			s.Tasks = append(s.Tasks[:k], s.Tasks[k+1:]...)
			s.StoreTasksToCsv()
			return nil
		}
	}
	return errors.New("不存在")
}

func (s *Csv) GetTask(id int) (v *ServerConfig, err error) {
	for _, v = range s.Tasks {
		if v.Id == id {
			return
		}
	}
	err = errors.New("未找到")
	return
}

func (s *Csv) StoreHostToCsv() {
	// 创建文件
	csvFile, err := os.Create(beego.AppPath + "/conf/hosts.csv")
	if err != nil {
		panic(err)
	}
	defer csvFile.Close()
	// 获取csv的Writer
	writer := csv.NewWriter(csvFile)
	// 将map中的Post转换成slice，因为csv的Write需要slice参数
	// 并写入csv文件
	for _, host := range s.Hosts {
		record := []string{
			host.Host,
			host.Target,
			strconv.Itoa(host.ClientId),
			host.HeaderChange,
			host.HostChange,
			host.Remark,
		}
		err1 := writer.Write(record)
		if err1 != nil {
			panic(err1)
		}
	}
	// 确保所有内存数据刷到csv文件
	writer.Flush()
}

func (s *Csv) LoadClientFromCsv() {
	path := beego.AppPath + "/conf/clients.csv"
	records, err := s.openFile(path)
	if err != nil {
		log.Fatal("配置文件打开错误:", path)
	}
	var clients []*Client
	// 将每一行数据保存到内存slice中
	for _, item := range records {
		post := &Client{
			Id:        GetIntNoErrByStr(item[0]),
			VerifyKey: item[1],
			Addr:      item[2],
			Remark:    item[3],
			Status:    GetBoolByStr(item[4]),
			Cnf: &ServerConfig{
				U:        item[5],
				P:        item[6],
				Crypt:    GetBoolByStr(item[7]),
				Mux:      GetBoolByStr(item[8]),
				Compress: item[9],
			},
		}
		if post.Id > s.ClientIncreaseId {
			s.ClientIncreaseId = post.Id
		}
		post.Flow = new(Flow)
		clients = append(clients, post)
	}
	s.Clients = clients
}

func (s *Csv) LoadHostFromCsv() {
	path := beego.AppPath + "/conf/hosts.csv"
	records, err := s.openFile(path)
	if err != nil {
		log.Fatal("配置文件打开错误:", path)
	}
	var hosts []*HostList
	// 将每一行数据保存到内存slice中
	for _, item := range records {
		post := &HostList{
			ClientId:     GetIntNoErrByStr(item[2]),
			Host:         item[0],
			Target:       item[1],
			HeaderChange: item[3],
			HostChange:   item[4],
			Remark:       item[5],
		}
		post.Flow = new(Flow)
		hosts = append(hosts, post)
	}
	s.Hosts = hosts
}

func (s *Csv) DelHost(host string) error {
	for k, v := range s.Hosts {
		if v.Host == host {
			s.Hosts = append(s.Hosts[:k], s.Hosts[k+1:]...)
			s.StoreHostToCsv()
			return nil
		}
	}
	return errors.New("不存在")
}

func (s *Csv) NewHost(t *HostList) {
	t.Flow = new(Flow)
	s.Hosts = append(s.Hosts, t)
	s.StoreHostToCsv()

}

func (s *Csv) UpdateHost(t *HostList) error {
	for k, v := range s.Hosts {
		if v.Host == t.Host {
			s.Hosts = append(s.Hosts[:k], s.Hosts[k+1:]...)
			s.Hosts = append(s.Hosts, t)
			s.StoreHostToCsv()
			return nil
		}
	}
	return errors.New("不存在")
}

func (s *Csv) GetHostList(start, length int, id int) ([]*HostList, int) {
	list := make([]*HostList, 0)
	var cnt int
	for _, v := range s.Hosts {
		if id == 0 || v.ClientId == id {
			cnt++
			if start--; start < 0 {
				if length--; length > 0 {
					list = append(list, v)
				}
			}
		}
	}
	return list, cnt
}

func (s *Csv) DelClient(id int) error {
	for k, v := range s.Clients {
		if v.Id == id {
			s.Clients = append(s.Clients[:k], s.Clients[k+1:]...)
			s.StoreClientsToCsv()
			return nil
		}
	}
	return errors.New("不存在")
}

func (s *Csv) NewClient(c *Client) {
	s.Lock()
	defer s.Unlock()
	c.Flow = new(Flow)
	s.Clients = append(s.Clients, c)
	s.StoreClientsToCsv()
}

func (s *Csv) GetClientId() int {
	s.Lock()
	defer s.Unlock()
	s.ClientIncreaseId++
	return s.ClientIncreaseId
}

func (s *Csv) UpdateClient(t *Client) error {
	s.Lock()
	defer s.Unlock()
	for k, v := range s.Clients {
		if v.Id == t.Id {
			s.Clients = append(s.Clients[:k], s.Clients[k+1:]...)
			s.Clients = append(s.Clients, t)
			s.StoreClientsToCsv()
			return nil
		}
	}
	return errors.New("不存在")
}

func (s *Csv) GetClientList(start, length int) ([]*Client, int) {
	list := make([]*Client, 0)
	var cnt int
	for _, v := range s.Clients {
		cnt++
		if start--; start < 0 {
			if length--; length > 0 {
				list = append(list, v)
			}
		}
	}
	return list, cnt
}

func (s *Csv) GetClient(id int) (v *Client, err error) {
	for _, v = range s.Clients {
		if v.Id == id {
			return
		}
	}
	err = errors.New("未找到")
	return
}
func (s *Csv) StoreClientsToCsv() {
	// 创建文件
	csvFile, err := os.Create(beego.AppPath + "/conf/clients.csv")
	if err != nil {
		log.Fatalf(err.Error())
	}
	defer csvFile.Close()
	writer := csv.NewWriter(csvFile)
	for _, client := range s.Clients {
		record := []string{
			strconv.Itoa(client.Id),
			client.VerifyKey,
			client.Addr,
			client.Remark,
			strconv.FormatBool(client.Status),
			client.Cnf.U,
			client.Cnf.P,
			utils.GetStrByBool(client.Cnf.Crypt),
			utils.GetStrByBool(client.Cnf.Mux),
			client.Cnf.Compress,
		}
		err := writer.Write(record)
		if err != nil {
			log.Fatalf(err.Error())
		}
	}
	writer.Flush()
}

//init csv from file
func GetCsvDb() *Csv {
	once.Do(func() {
		CsvDb = NewCsv()
		CsvDb.Init()
	})
	return CsvDb
}

//深拷贝serverConfig
func DeepCopyConfig(c *ServerConfig) *ServerConfig {
	return &ServerConfig{
		TcpPort:        c.TcpPort,
		VerifyKey:      c.VerifyKey,
		Mode:           c.Mode,
		Target:         c.Target,
		U:              c.U,
		P:              c.P,
		Compress:       c.Compress,
		Start:          c.Start,
		IsRun:          c.IsRun,
		ClientStatus:   c.ClientStatus,
		Crypt:          c.Crypt,
		Mux:            c.Mux,
		CompressEncode: c.CompressEncode,
		CompressDecode: c.CompressDecode,
		Id:             c.Id,
		ClientId:       c.ClientId,
		UseClientCnf:   c.UseClientCnf,
		Flow:           c.Flow,
		Remark:         c.Remark,
	}
}