//go:build !windows
// +build !windows

/*
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 (
	"bufio"
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"syscall"
	"time"

	rmm "github.com/amidaware/rmmagent/shared"
	ps "github.com/elastic/go-sysinfo"
	"github.com/go-resty/resty/v2"
	"github.com/jaypipes/ghw"
	"github.com/kardianos/service"
	"github.com/shirou/gopsutil/v3/cpu"
	"github.com/shirou/gopsutil/v3/disk"
	psHost "github.com/shirou/gopsutil/v3/host"
	"github.com/spf13/viper"
	trmm "github.com/wh1te909/trmm-shared"
)

func ShowStatus(version string) {
	fmt.Println(version)
}

func (a *Agent) GetDisks() []trmm.Disk {
	ret := make([]trmm.Disk, 0)
	partitions, err := disk.Partitions(false)
	if err != nil {
		a.Logger.Debugln(err)
		return ret
	}

	for _, p := range partitions {
		if strings.Contains(p.Device, "dev/loop") {
			continue
		}
		usage, err := disk.Usage(p.Mountpoint)
		if err != nil {
			a.Logger.Debugln(err)
			continue
		}

		d := trmm.Disk{
			Device:  p.Device,
			Fstype:  p.Fstype,
			Total:   ByteCountSI(usage.Total),
			Used:    ByteCountSI(usage.Used),
			Free:    ByteCountSI(usage.Free),
			Percent: int(usage.UsedPercent),
		}
		ret = append(ret, d)

	}
	return ret
}

func (a *Agent) SystemRebootRequired() (bool, error) {
	// deb
	paths := [2]string{"/var/run/reboot-required", "/run/reboot-required"}
	for _, p := range paths {
		if trmm.FileExists(p) {
			return true, nil
		}
	}
	// rhel
	bins := [2]string{"/usr/bin/needs-restarting", "/bin/needs-restarting"}
	for _, bin := range bins {
		if trmm.FileExists(bin) {
			opts := a.NewCMDOpts()
			// https://man7.org/linux/man-pages/man1/needs-restarting.1.html
			// -r Only report whether a full reboot is required (exit code 1) or not (exit code 0).
			opts.Command = fmt.Sprintf("%s -r", bin)
			out := a.CmdV2(opts)

			if out.Status.Error != nil {
				a.Logger.Debugln("SystemRebootRequired(): ", out.Status.Error.Error())
				continue
			}

			if out.Status.Exit == 1 {
				return true, nil
			}

			return false, nil
		}
	}
	return false, nil
}

func (a *Agent) LoggedOnUser() string {
	var ret string
	users, err := psHost.Users()
	if err != nil {
		return ret
	}

	// return the first logged in user
	for _, user := range users {
		if user.User != "" {
			ret = user.User
			break
		}
	}
	return ret
}

func (a *Agent) osString() string {
	h, err := psHost.Info()
	if err != nil {
		return "error getting host info"
	}
	return fmt.Sprintf("%s %s %s %s", strings.Title(h.Platform), h.PlatformVersion, h.KernelArch, h.KernelVersion)
}

func NewAgentConfig() *rmm.AgentConfig {
	viper.SetConfigName("tacticalagent")
	viper.SetConfigType("json")
	viper.AddConfigPath("/etc/")
	viper.AddConfigPath(".")
	err := viper.ReadInConfig()

	if err != nil {
		return &rmm.AgentConfig{}
	}

	agentpk := viper.GetString("agentpk")
	pk, _ := strconv.Atoi(agentpk)

	ret := &rmm.AgentConfig{
		BaseURL:       viper.GetString("baseurl"),
		AgentID:       viper.GetString("agentid"),
		APIURL:        viper.GetString("apiurl"),
		Token:         viper.GetString("token"),
		AgentPK:       agentpk,
		PK:            pk,
		Cert:          viper.GetString("cert"),
		Proxy:         viper.GetString("proxy"),
		CustomMeshDir: viper.GetString("meshdir"),
		NatsProxyPath: viper.GetString("natsproxypath"),
		NatsProxyPort: viper.GetString("natsproxyport"),
	}
	return ret
}

func (a *Agent) RunScript(code string, shell string, args []string, timeout int) (stdout, stderr string, exitcode int, e error) {
	code = removeWinNewLines(code)
	content := []byte(code)

	f, err := createTmpFile()
	if err != nil {
		a.Logger.Errorln("RunScript createTmpFile()", err)
		return "", err.Error(), 85, err
	}
	defer os.Remove(f.Name())

	if _, err := f.Write(content); err != nil {
		a.Logger.Errorln(err)
		return "", err.Error(), 85, err
	}

	if err := f.Close(); err != nil {
		a.Logger.Errorln(err)
		return "", err.Error(), 85, err
	}

	if err := os.Chmod(f.Name(), 0770); err != nil {
		a.Logger.Errorln(err)
		return "", err.Error(), 85, err
	}

	opts := a.NewCMDOpts()
	opts.IsScript = true
	opts.Shell = f.Name()
	opts.Args = args
	opts.Timeout = time.Duration(timeout)
	out := a.CmdV2(opts)
	retError := ""
	if out.Status.Error != nil {
		retError += CleanString(out.Status.Error.Error())
		retError += "\n"
	}
	if len(out.Stderr) > 0 {
		retError += out.Stderr
	}
	return out.Stdout, retError, out.Status.Exit, nil
}

func SetDetached() *syscall.SysProcAttr {
	return &syscall.SysProcAttr{Setpgid: true}
}

func (a *Agent) AgentUpdate(url, inno, version string) {

	self, err := os.Executable()
	if err != nil {
		a.Logger.Errorln("AgentUpdate() os.Executable():", err)
		return
	}

	f, err := createTmpFile()
	if err != nil {
		a.Logger.Errorln("AgentUpdate createTmpFile()", err)
		return
	}
	defer os.Remove(f.Name())

	a.Logger.Infof("Agent updating from %s to %s", a.Version, version)
	a.Logger.Infoln("Downloading agent update from", url)

	rClient := resty.New()
	rClient.SetCloseConnection(true)
	rClient.SetTimeout(15 * time.Minute)
	rClient.SetDebug(a.Debug)
	if len(a.Proxy) > 0 {
		rClient.SetProxy(a.Proxy)
	}

	r, err := rClient.R().SetOutput(f.Name()).Get(url)
	if err != nil {
		a.Logger.Errorln("AgentUpdate() download:", err)
		f.Close()
		return
	}
	if r.IsError() {
		a.Logger.Errorln("AgentUpdate() status code:", r.StatusCode())
		f.Close()
		return
	}

	f.Close()
	os.Chmod(f.Name(), 0755)
	err = os.Rename(f.Name(), self)
	if err != nil {
		a.Logger.Debugln("Detected /tmp on different filesystem")
		// rename does not work when src and dest are on different filesystems
		// so we need to manually copy it to the same fs then rename it
		cwd, err := os.Getwd()
		if err != nil {
			a.Logger.Errorln("AgentUpdate() os.Getwd():", err)
			return
		}
		// create a tmpfile in same fs as agent
		tmpfile := filepath.Join(cwd, GenerateAgentID())
		defer os.Remove(tmpfile)
		a.Logger.Debugln("Copying tmpfile from", f.Name(), "to", tmpfile)
		cperr := copyFile(f.Name(), tmpfile)
		if cperr != nil {
			a.Logger.Errorln("AgentUpdate() copyFile:", cperr)
			return
		}
		os.Chmod(tmpfile, 0755)
		rerr := os.Rename(tmpfile, self)
		if rerr != nil {
			a.Logger.Errorln("AgentUpdate() os.Rename():", rerr)
			return
		}
	}

	opts := a.NewCMDOpts()
	opts.Detached = true
	opts.Command = "systemctl restart tacticalagent.service"
	a.CmdV2(opts)
}

func (a *Agent) AgentUninstall(code string) {
	f, err := createTmpFile()
	if err != nil {
		a.Logger.Errorln("AgentUninstall createTmpFile():", err)
		return
	}

	f.Write([]byte(code))
	f.Close()
	os.Chmod(f.Name(), 0770)

	opts := a.NewCMDOpts()
	opts.IsScript = true
	opts.Shell = f.Name()
	opts.Args = []string{"uninstall"}
	opts.Detached = true
	a.CmdV2(opts)
}

func (a *Agent) NixMeshNodeID() string {
	var meshNodeID string
	meshSuccess := false
	a.Logger.Debugln("Getting mesh node id")

	if !trmm.FileExists(a.MeshSystemEXE) {
		a.Logger.Debugln(a.MeshSystemEXE, "does not exist. Skipping.")
		return ""
	}

	opts := a.NewCMDOpts()
	opts.IsExecutable = true
	opts.Shell = a.MeshSystemEXE
	opts.Command = "-nodeid"

	for !meshSuccess {
		out := a.CmdV2(opts)
		meshNodeID = out.Stdout
		a.Logger.Debugln("Stdout:", out.Stdout)
		a.Logger.Debugln("Stderr:", out.Stderr)
		if meshNodeID == "" {
			time.Sleep(1 * time.Second)
			continue
		} else if strings.Contains(strings.ToLower(meshNodeID), "graphical version") || strings.Contains(strings.ToLower(meshNodeID), "zenity") {
			time.Sleep(1 * time.Second)
			continue
		}
		meshSuccess = true
	}
	return meshNodeID
}

func (a *Agent) getMeshNodeID() (string, error) {
	return a.NixMeshNodeID(), nil
}

func (a *Agent) RecoverMesh() {
	a.Logger.Infoln("Attempting mesh recovery")
	opts := a.NewCMDOpts()
	opts.Command = "systemctl restart meshagent.service"
	a.CmdV2(opts)
	a.SyncMeshNodeID()
}

func (a *Agent) GetWMIInfo() map[string]interface{} {
	wmiInfo := make(map[string]interface{})
	ips := make([]string, 0)
	disks := make([]string, 0)
	cpus := make([]string, 0)
	gpus := make([]string, 0)

	// local ips
	host, err := ps.Host()
	if err != nil {
		a.Logger.Errorln("GetWMIInfo() ps.Host()", err)
	} else {
		for _, ip := range host.Info().IPs {
			if strings.Contains(ip, "127.0.") || strings.Contains(ip, "::1/128") {
				continue
			}
			ips = append(ips, ip)
		}
	}
	wmiInfo["local_ips"] = ips

	// disks
	block, err := ghw.Block(ghw.WithDisableWarnings())
	if err != nil {
		a.Logger.Errorln("ghw.Block()", err)
	} else {
		for _, disk := range block.Disks {
			if disk.IsRemovable || strings.Contains(disk.Name, "ram") {
				continue
			}
			ret := fmt.Sprintf("%s %s %s %s %s %s", disk.Vendor, disk.Model, disk.StorageController, disk.DriveType, disk.Name, ByteCountSI(disk.SizeBytes))
			ret = strings.TrimSpace(strings.ReplaceAll(ret, "unknown", ""))
			disks = append(disks, ret)
		}
	}
	wmiInfo["disks"] = disks

	// cpus
	cpuInfo, err := cpu.Info()
	if err != nil {
		a.Logger.Errorln("cpu.Info()", err)
	} else {
		if len(cpuInfo) > 0 {
			if cpuInfo[0].ModelName != "" {
				cpus = append(cpus, cpuInfo[0].ModelName)
			}
		}
	}
	wmiInfo["cpus"] = cpus

	// make/model
	wmiInfo["make_model"] = ""
	chassis, err := ghw.Chassis(ghw.WithDisableWarnings())
	if err != nil {
		a.Logger.Errorln("ghw.Chassis()", err)
	} else {
		if chassis.Vendor != "" || chassis.Version != "" {
			wmiInfo["make_model"] = fmt.Sprintf("%s %s", chassis.Vendor, chassis.Version)
		}
	}

	// gfx cards

	gpu, err := ghw.GPU(ghw.WithDisableWarnings())
	if err != nil {
		a.Logger.Errorln("ghw.GPU()", err)
	} else {
		for _, i := range gpu.GraphicsCards {
			if i.DeviceInfo != nil {
				ret := fmt.Sprintf("%s %s", i.DeviceInfo.Vendor.Name, i.DeviceInfo.Product.Name)
				gpus = append(gpus, ret)
			}

		}
	}
	wmiInfo["gpus"] = gpus

	// temp hack for ARM cpu/make/model if rasp pi
	var makeModel string
	if strings.Contains(runtime.GOARCH, "arm") {
		file, _ := os.Open("/proc/cpuinfo")
		scanner := bufio.NewScanner(file)
		for scanner.Scan() {
			if strings.Contains(strings.ToLower(scanner.Text()), "raspberry") {
				model := strings.Split(scanner.Text(), ":")
				if len(model) == 2 {
					makeModel = strings.TrimSpace(model[1])
					break
				}
			}
		}
	}

	if len(cpus) == 0 {
		wmiInfo["cpus"] = []string{makeModel}
	}
	if makeModel != "" && (wmiInfo["make_model"] == "" || wmiInfo["make_model"] == "unknown unknown") {
		wmiInfo["make_model"] = makeModel
	}
	if len(gpus) == 1 && gpus[0] == "unknown unknown" {
		wmiInfo["gpus"] = ""
	}

	return wmiInfo
}

// windows only below TODO add into stub file

func (a *Agent) PlatVer() (string, error) { return "", nil }

func (a *Agent) SendSoftware() {}

func (a *Agent) UninstallCleanup() {}

func (a *Agent) RunMigrations() {}

func GetServiceStatus(name string) (string, error) { return "", nil }

func (a *Agent) GetPython(force bool) {}

type SchedTask struct{ Name string }

func (a *Agent) PatchMgmnt(enable bool) error { return nil }

func (a *Agent) CreateSchedTask(st SchedTask) (bool, error) { return false, nil }

func DeleteSchedTask(name string) error { return nil }

func ListSchedTasks() []string { return []string{} }

func (a *Agent) GetEventLog(logName string, searchLastDays int) []rmm.EventLogMsg {
	return []rmm.EventLogMsg{}
}

func (a *Agent) GetServiceDetail(name string) trmm.WindowsService { return trmm.WindowsService{} }

func (a *Agent) ControlService(name, action string) rmm.WinSvcResp {
	return rmm.WinSvcResp{Success: false, ErrorMsg: "/na"}
}

func (a *Agent) EditService(name, startupType string) rmm.WinSvcResp {
	return rmm.WinSvcResp{Success: false, ErrorMsg: "/na"}
}

func (a *Agent) GetInstalledSoftware() []trmm.WinSoftwareList { return []trmm.WinSoftwareList{} }

func (a *Agent) ChecksRunning() bool { return false }

func (a *Agent) RunTask(id int) error { return nil }

func (a *Agent) InstallChoco() {}

func (a *Agent) InstallWithChoco(name string) (string, error) { return "", nil }

func (a *Agent) GetWinUpdates() {}

func (a *Agent) InstallUpdates(guids []string) {}

func (a *Agent) installMesh(meshbin, exe, proxy string) (string, error) {
	return "not implemented", nil
}

func CMDShell(shell string, cmdArgs []string, command string, timeout int, detached bool) (output [2]string, e error) {
	return [2]string{"", ""}, nil
}

func CMD(exe string, args []string, timeout int, detached bool) (output [2]string, e error) {
	return [2]string{"", ""}, nil
}

func (a *Agent) GetServices() []trmm.WindowsService { return []trmm.WindowsService{} }

func (a *Agent) Start(_ service.Service) error { return nil }

func (a *Agent) Stop(_ service.Service) error { return nil }

func (a *Agent) InstallService() error { return nil }