package api

import (
	"encoding/json"
	"fmt"
	"gitee.ltd/lxh/logger/log"
	"github.com/gin-gonic/gin"
	"github.com/spf13/cast"
	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
	"os"
	"strings"
	"time"
	"wireguard-dashboard/client"
	"wireguard-dashboard/http/param"
	"wireguard-dashboard/model/entity"
	"wireguard-dashboard/model/template_data"
	"wireguard-dashboard/model/vo"
	"wireguard-dashboard/queues"
	"wireguard-dashboard/repository"
	"wireguard-dashboard/utils"
)

type clients struct{}

func Client() clients {
	return clients{}
}

// List
// @description: 客户端列表
// @receiver clients
// @param c
func (clients) List(c *gin.Context) {
	var p param.ClientList
	if err := c.ShouldBind(&p); err != nil {
		utils.GinResponse(c).FailedWithErr("参数错误", err)
		return
	}

	data, total, err := repository.Client().List(p)
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取失败")
		return
	}

	utils.GinResponse(c).OkWithPage(data, total, p.Current, p.Size)
}

// Save
// @description: 新增/更新客户端
// @receiver clients
// @param c
func (clients) Save(c *gin.Context) {
	var p param.SaveClient
	if err := c.ShouldBind(&p); err != nil {
		utils.GinResponse(c).FailedWithErr("参数错误", err)
		return
	}

	info, ok := c.Get("user")
	if !ok {
		utils.GinResponse(c).FailedWithMsg("获取信息失败")
		return
	}

	_, err := repository.Client().Save(p, info.(*entity.User).Id)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("操作失败", err)
		return
	}

	go func() {
		if err = queues.PutAsyncWireguardConfigFile(p.ServerId); err != nil {
			log.Errorf("[新增/编辑客户端]同步配置文件失败: %v", err.Error())
		}
	}()

	utils.GinResponse(c).OK()
}

// AssignIPAndAllowedIP
// @description: 分配客户端IP和允许访问的IP段
// @receiver clients
// @param c
func (clients) AssignIPAndAllowedIP(c *gin.Context) {
	var p param.AssignIPAndAllowedIP
	if err := c.ShouldBind(&p); err != nil {
		utils.GinResponse(c).FailedWithErr("参数错误", err)
		return
	}

	// 获取一下服务端信息，因为IP分配需要根据服务端的IP制定
	serverInfo, err := repository.Server().GetServer()
	if err != nil {
		utils.GinResponse(c).FailedWithErr("获取服务端信息失败", err)
		return
	}

	var assignIPS []string
	assignIPS = append(assignIPS, serverInfo.IpScope)
	switch p.Rule {
	case "AUTO":
		// 只获取最新的一个
		var clientInfo *entity.Client
		if err = repository.Client().Order("created_at DESC").Take(&clientInfo).Error; err == nil {
			if cast.ToInt64(utils.Wireguard().GetIPSuffix(clientInfo.IpAllocation)) >= 255 {
				utils.GinResponse(c).FailedWithMsg("当前IP分配错误，请手动进行分配")
				return
			}
			assignIPS = append(assignIPS, clientInfo.IpAllocation)
		}

	case "RANDOM":
		// 查询全部客户端不管是禁用还是没禁用的
		var clientsInfo []entity.Client
		if err = repository.Client().Find(&clientsInfo).Error; err != nil {
			utils.GinResponse(c).FailedWithErr("获取失败", err)
			return
		}

		for _, v := range clientsInfo {
			assignIPS = append(assignIPS, v.IpAllocation)
		}
	}

	clientIP := utils.Wireguard().GenerateClientIP(serverInfo.IpScope, p.Rule, assignIPS...)

	utils.GinResponse(c).OKWithData(map[string]any{
		"clientIP": []string{fmt.Sprintf("%s/32", clientIP)},
		"serverIP": []string{serverInfo.IpScope},
	})
}

// GenerateKeys
// @description: 生成密钥对
// @receiver clients
// @param c
func (clients) GenerateKeys(c *gin.Context) {
	// 为空，新增
	privateKey, err := wgtypes.GeneratePrivateKey()
	if err != nil {
		utils.GinResponse(c).FailedWithErr("生成密钥对失败", err)
		return
	}
	publicKey := privateKey.PublicKey().String()
	presharedKey, err := wgtypes.GenerateKey()
	if err != nil {
		return
	}
	keys := template_data.Keys{
		PrivateKey:   privateKey.String(),
		PublicKey:    publicKey,
		PresharedKey: presharedKey.String(),
	}

	utils.GinResponse(c).OKWithData(keys)
}

// Delete
// @description: 删除客户端
// @receiver clients
// @param c
func (clients) Delete(c *gin.Context) {
	var id = c.Param("id")
	if id == "" || id == "undefined" {
		utils.GinResponse(c).FailedWithMsg("参数错误")
		return
	}

	if err := repository.Client().Delete(id); err != nil {
		utils.GinResponse(c).FailedWithMsg("操作失败")
		return
	}

	// 再同步一下配置文件
	go func() {
		if err := queues.PutAsyncWireguardConfigFile(""); err != nil {
			log.Errorf("[下线客户端]同步配置文件失败: %v", err.Error())
		}
	}()

	utils.GinResponse(c).OK()
}

// Download
// @description: 下载配置文件
// @receiver clients
// @param c
func (clients) Download(c *gin.Context) {
	var id = c.Param("id")
	if id == "" || id == "undefined" {
		utils.GinResponse(c).FailedWithMsg("参数错误")
		return
	}

	data, err := repository.Client().GetById(id)
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取失败")
		return
	}

	var keys template_data.Keys
	_ = json.Unmarshal([]byte(data.Keys), &keys)

	serverSetting, err := repository.System().GetServerSetting()
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取设置失败")
		return
	}

	outPath, err := utils.Wireguard().GenerateClientFile(&data, serverSetting)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("生成失败", err)
		return
	}

	// 输出文件流
	c.Header("Content-Type", "application/octet-stream")
	c.Header("Content-Disposition", "attachment; filename="+outPath)
	c.Header("Content-Transfer-Encoding", "binary")
	c.Header("Connection", "keep-alive")
	c.File(outPath)
	if err = os.Remove(outPath); err != nil {
		log.Errorf("删除临时文件失败: %s", err.Error())
	}
}

// GenerateQrCode
// @description: 生成客户端信息二维码
// @receiver clients
// @param c
func (clients) GenerateQrCode(c *gin.Context) {
	var id = c.Param("id")
	if id == "" || id == "undefined" {
		utils.GinResponse(c).FailedWithMsg("参数错误")
		return
	}

	data, err := repository.Client().GetById(id)
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取失败")
		return
	}

	var keys template_data.Keys
	_ = json.Unmarshal([]byte(data.Keys), &keys)

	serverSetting, err := repository.System().GetServerSetting()
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取设置失败")
		return
	}

	outPath, err := utils.Wireguard().GenerateClientFile(&data, serverSetting)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("生成失败", err)
		return
	}

	// 读取文件内容
	fileContent, err := os.ReadFile(outPath)
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("读取文件失败")
		return
	}

	png, err := utils.QRCode().GenerateQrCodeBase64(fileContent, 256)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("生成二维码失败", err)
		return
	}

	if err = os.Remove(outPath); err != nil {
		log.Errorf("删除临时文件失败: %s", err.Error())
	}

	utils.GinResponse(c).OKWithData(map[string]interface{}{
		"qrCode": png,
	})
}

// SendEmail
// @description: 发送邮件
// @receiver clients
// @param c
func (clients) SendEmail(c *gin.Context) {
	var id = c.Param("id")
	if id == "" || id == "undefined" {
		utils.GinResponse(c).FailedWithMsg("id不能为空")
		return
	}

	// 先校验一下邮箱发送是否可用
	if err := utils.Mail().VerifyConfig(); err != nil {
		utils.GinResponse(c).FailedWithMsg(err.Error())
		return
	}

	// 获取该客户端信息
	clientInfo, err := repository.Client().GetById(id)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("获取失败", err)
		return
	}

	if clientInfo.Email == "" {
		utils.GinResponse(c).FailedWithMsg("当前客户端未配置联系邮箱！")
		return
	}

	serverSetting, err := repository.System().GetServerSetting()
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取设置失败")
		return
	}

	outPath, err := utils.Wireguard().GenerateClientFile(&clientInfo, serverSetting)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("生成失败", err)
		return
	}

	err = utils.Mail().SendMail(clientInfo.Email, fmt.Sprintf("客户端: %s", clientInfo.Name), "请查收附件", outPath)
	if err != nil {
		utils.GinResponse(c).FailedWithErr("发送邮件失败", err)
		return
	}

	if err = os.Remove(outPath); err != nil {
		log.Errorf("删除临时文件失败: %s", err.Error())
	}
	utils.GinResponse(c).OK()
}

// Status
// @description: 获取客户端状态信息，链接状态等
// @receiver clients
// @param c
func (clients) Status(c *gin.Context) {
	// 使用sdk拉取一下客户端信息
	devices, err := client.WireguardClient.Devices()
	if err != nil {
		utils.GinResponse(c).FailedWithErr("获取客户端信息失败", err)
		return
	}

	var data []vo.ClientStatus
	// 遍历客户端数据，并渲染数据信息
	for _, d := range devices {
		for _, p := range d.Peers {
			clientInfo, err := repository.Client().GetByPublicKey(p.PublicKey.String())
			if err != nil {
				log.Errorf("没有找到公钥匹配的客户端: %s", p.PublicKey.String())
				continue
			}
			var ipAllocation string
			for _, iaip := range p.AllowedIPs {
				ipAllocation += iaip.String() + ","
			}
			ipAllocation = strings.TrimRight(ipAllocation, ",")
			isOnline := time.Since(p.LastHandshakeTime).Minutes() < 3
			data = append(data, vo.ClientStatus{
				ID:            clientInfo.Id,
				Name:          clientInfo.Name,
				Email:         clientInfo.Email,
				IpAllocation:  ipAllocation,
				Endpoint:      p.Endpoint.String(),
				Received:      utils.FlowCalculation().Parse(p.ReceiveBytes),
				Transmitted:   utils.FlowCalculation().Parse(p.TransmitBytes),
				IsOnline:      isOnline,
				LastHandShake: p.LastHandshakeTime.Format("2006-01-02 15:04:05"),
			})
		}
	}

	utils.GinResponse(c).OKWithData(data)
}

// Offline
// @description: 强制下线指定客户端
// @receiver clients
// @param c
func (clients) Offline(c *gin.Context) {
	id := c.Param("id")
	if id == "" || id == "undefined" {
		utils.GinResponse(c).FailedWithMsg("参数错误")
		return
	}

	// 查询一下客户端信息
	clientInfo, err := repository.Client().GetById(id)
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取信息失败")
		return
	}

	keys := template_data.Keys{}
	_ = json.Unmarshal([]byte(clientInfo.Keys), &keys)

	connectInfo, err := utils.Wireguard().GetSpecClient(keys.PublicKey)
	if err != nil {
		utils.GinResponse(c).FailedWithMsg("获取客户端信息失败")
		return
	}

	if connectInfo == nil {
		utils.GinResponse(c).FailedWithMsg("未获取到该客户端链接信息")
		return
	}

	// 获取到了，执行踢下线操作。此处踢下线就是禁用该客户端
	if err = repository.Client().Disabled(clientInfo.Id); err != nil {
		utils.GinResponse(c).FailedWithErr("客户端下线失败: %v", err)
		return
	}

	// 再同步一下配置文件
	go func() {
		if err = queues.PutAsyncWireguardConfigFile(clientInfo.ServerId); err != nil {
			log.Errorf("[下线客户端]同步配置文件失败: %v", err.Error())
		}
	}()

	utils.GinResponse(c).OK()
}