/*
Copyright 2022 AmidaWare LLC.

Licensed under the Tactical RMM License Version 1.0 (the “License”).
You may only use the Licensed Software in accordance with the License.
A copy of the License is available at:

https://license.tacticalrmm.com

*/

package agent

import (
	"fmt"
	"io"
	"net/url"
	"os"
	"path/filepath"
	"regexp"
	"runtime"
	"strconv"
	"strings"
	"time"

	"github.com/go-resty/resty/v2"
	trmm "github.com/wh1te909/trmm-shared"
)

type Installer struct {
	Headers     map[string]string
	RMM         string
	ClientID    int
	SiteID      int
	Description string
	AgentType   string
	Power       bool
	RDP         bool
	Ping        bool
	Token       string
	LocalMesh   string
	Cert        string
	Proxy       string
	Timeout     time.Duration
	SaltMaster  string
	Silent      bool
	NoMesh      bool
	MeshDir     string
	MeshNodeID  string
}

func (a *Agent) Install(i *Installer) {
	a.checkExistingAndRemove(i.Silent)

	i.Headers = map[string]string{
		"content-type":  "application/json",
		"Authorization": fmt.Sprintf("Token %s", i.Token),
	}
	a.AgentID = GenerateAgentID()
	a.Logger.Debugln("Agent ID:", a.AgentID)

	u, err := url.Parse(i.RMM)
	if err != nil {
		a.installerMsg(err.Error(), "error", i.Silent)
	}

	if u.Scheme != "https" && u.Scheme != "http" {
		a.installerMsg("Invalid URL (must contain https or http)", "error", i.Silent)
	}

	// will match either ipv4 , or ipv4:port
	var ipPort = regexp.MustCompile(`[0-9]+(?:\.[0-9]+){3}(:[0-9]+)?`)

	// if ipv4:port, strip the port to get ip for salt master
	if ipPort.MatchString(u.Host) && strings.Contains(u.Host, ":") {
		i.SaltMaster = strings.Split(u.Host, ":")[0]
	} else if strings.Contains(u.Host, ":") {
		i.SaltMaster = strings.Split(u.Host, ":")[0]
	} else {
		i.SaltMaster = u.Host
	}

	a.Logger.Debugln("API:", i.SaltMaster)

	terr := TestTCP(fmt.Sprintf("%s:4222", i.SaltMaster))
	if terr != nil {
		a.installerMsg(fmt.Sprintf("ERROR: Either port 4222 TCP is not open on your RMM, or nats.service is not running.\n\n%s", terr.Error()), "error", i.Silent)
	}

	baseURL := u.Scheme + "://" + u.Host
	a.Logger.Debugln("Base URL:", baseURL)

	iClient := resty.New()
	iClient.SetCloseConnection(true)
	iClient.SetTimeout(15 * time.Second)
	iClient.SetDebug(a.Debug)
	iClient.SetHeaders(i.Headers)

	// set proxy if applicable
	if len(i.Proxy) > 0 {
		a.Logger.Infoln("Using proxy:", i.Proxy)
		iClient.SetProxy(i.Proxy)
	}

	creds, cerr := iClient.R().Get(fmt.Sprintf("%s/api/v3/installer/", baseURL))
	if cerr != nil {
		a.installerMsg(cerr.Error(), "error", i.Silent)
	}
	if creds.StatusCode() == 401 {
		a.installerMsg("Installer token has expired. Please generate a new one.", "error", i.Silent)
	}

	verPayload := map[string]string{"version": a.Version}
	iVersion, ierr := iClient.R().SetBody(verPayload).Post(fmt.Sprintf("%s/api/v3/installer/", baseURL))
	if ierr != nil {
		a.installerMsg(ierr.Error(), "error", i.Silent)
	}
	if iVersion.StatusCode() != 200 {
		a.installerMsg(DjangoStringResp(iVersion.String()), "error", i.Silent)
	}

	rClient := resty.New()
	rClient.SetCloseConnection(true)
	rClient.SetTimeout(i.Timeout * time.Second)
	rClient.SetDebug(a.Debug)
	// set rest knox headers
	rClient.SetHeaders(i.Headers)

	// set local cert if applicable
	if len(i.Cert) > 0 {
		if !trmm.FileExists(i.Cert) {
			a.installerMsg(fmt.Sprintf("%s does not exist", i.Cert), "error", i.Silent)
		}
		rClient.SetRootCertificate(i.Cert)
	}

	if len(i.Proxy) > 0 {
		rClient.SetProxy(i.Proxy)
	}

	var arch string
	switch a.Arch {
	case "x86_64":
		arch = "64"
	case "x86":
		arch = "32"
	}

	var installerMeshSystemEXE string
	if len(i.MeshDir) > 0 {
		installerMeshSystemEXE = filepath.Join(i.MeshDir, "MeshAgent.exe")
	} else {
		installerMeshSystemEXE = a.MeshSystemEXE
	}

	var meshNodeID string

	if runtime.GOOS == "windows" && !i.NoMesh {
		mesh := filepath.Join(a.ProgramDir, a.MeshInstaller)
		if i.LocalMesh == "" {
			a.Logger.Infoln("Downloading mesh agent...")
			payload := map[string]string{"arch": arch, "plat": a.Platform}
			r, err := rClient.R().SetBody(payload).SetOutput(mesh).Post(fmt.Sprintf("%s/api/v3/meshexe/", baseURL))
			if err != nil {
				a.installerMsg(fmt.Sprintf("Failed to download mesh agent: %s", err.Error()), "error", i.Silent)
			}
			if r.StatusCode() != 200 {
				a.installerMsg(fmt.Sprintf("Unable to download the mesh agent from the RMM. %s", r.String()), "error", i.Silent)
			}
		} else {
			err := copyFile(i.LocalMesh, mesh)
			if err != nil {
				a.installerMsg(err.Error(), "error", i.Silent)
			}
		}

		a.Logger.Infoln("Installing mesh agent...")
		a.Logger.Debugln("Mesh agent:", mesh)
		time.Sleep(1 * time.Second)

		meshNodeID, err = a.installMesh(mesh, installerMeshSystemEXE, i.Proxy)
		if err != nil {
			a.installerMsg(fmt.Sprintf("Failed to install mesh agent: %s", err.Error()), "error", i.Silent)
		}
	}

	if len(i.MeshNodeID) > 0 {
		meshNodeID = i.MeshNodeID
	}

	a.Logger.Infoln("Adding agent to dashboard")
	// add agent
	type NewAgentResp struct {
		AgentPK int    `json:"pk"`
		Token   string `json:"token"`
	}
	agentPayload := map[string]interface{}{
		"agent_id":        a.AgentID,
		"hostname":        a.Hostname,
		"site":            i.SiteID,
		"monitoring_type": i.AgentType,
		"mesh_node_id":    meshNodeID,
		"description":     i.Description,
		"goarch":          a.GoArch,
		"plat":            a.Platform,
	}

	r, err := rClient.R().SetBody(agentPayload).SetResult(&NewAgentResp{}).Post(fmt.Sprintf("%s/api/v3/newagent/", baseURL))
	if err != nil {
		a.installerMsg(err.Error(), "error", i.Silent)
	}
	if r.StatusCode() != 200 {
		a.installerMsg(r.String(), "error", i.Silent)
	}

	agentPK := r.Result().(*NewAgentResp).AgentPK
	agentToken := r.Result().(*NewAgentResp).Token

	a.Logger.Debugln("Agent token:", agentToken)
	a.Logger.Debugln("Agent PK:", agentPK)

	createAgentConfig(baseURL, a.AgentID, i.SaltMaster, agentToken, strconv.Itoa(agentPK), i.Cert, i.Proxy, i.MeshDir)
	time.Sleep(1 * time.Second)
	// refresh our agent with new values
	a = New(a.Logger, a.Version)
	a.Logger.Debugf("%+v\n", a)

	// set new headers, no longer knox auth...use agent auth
	rClient.SetHeaders(a.Headers)

	time.Sleep(3 * time.Second)
	// check in once
	a.DoNatsCheckIn()

	if runtime.GOOS == "windows" {
		// send software api
		a.SendSoftware()

		a.Logger.Debugln("Creating temp dir")
		a.CreateTRMMTempDir()

		a.Logger.Debugln("Disabling automatic windows updates")
		a.PatchMgmnt(true)

		a.Logger.Infoln("Installing service...")
		err := a.InstallService()
		if err != nil {
			a.installerMsg(err.Error(), "error", i.Silent)
		}

		time.Sleep(1 * time.Second)
		a.Logger.Infoln("Starting service...")
		out := a.ControlService(winSvcName, "start")
		if !out.Success {
			a.installerMsg(out.ErrorMsg, "error", i.Silent)
		}

		a.Logger.Infoln("Adding windows defender exclusions")
		a.addDefenderExlusions()

		if i.Power {
			a.Logger.Infoln("Disabling sleep/hibernate...")
			DisableSleepHibernate()
		}

		if i.Ping {
			a.Logger.Infoln("Enabling ping...")
			EnablePing()
		}

		if i.RDP {
			a.Logger.Infoln("Enabling RDP...")
			EnableRDP()
		}
	}

	a.installerMsg("Installation was successfull!\nAllow a few minutes for the agent to properly display in the RMM", "info", i.Silent)
}

func copyFile(src, dst string) error {
	in, err := os.Open(src)
	if err != nil {
		return err
	}
	defer in.Close()

	out, err := os.Create(dst)
	if err != nil {
		return err
	}
	defer out.Close()

	_, err = io.Copy(out, in)
	if err != nil {
		return err
	}
	return nil
}