package cmd

import (
  "context"
  "fmt"
  "github.com/FalconOpsLLC/goexec/internal/util"
  "github.com/FalconOpsLLC/goexec/pkg/goexec"
  tschexec "github.com/FalconOpsLLC/goexec/pkg/goexec/tsch"
  "github.com/oiweiwei/go-msrpc/ssp/gssapi"
  "github.com/spf13/cobra"
  "time"
)

func tschCmdInit() {
  cmdFlags[tschCmd] = []*flagSet{
    defaultAuthFlags,
    defaultLogFlags,
    defaultNetRpcFlags,
  }
  tschDemandCmdInit()
  tschCreateCmdInit()

  tschCmd.PersistentFlags().AddFlagSet(defaultAuthFlags.Flags)
  tschCmd.PersistentFlags().AddFlagSet(defaultLogFlags.Flags)
  tschCmd.PersistentFlags().AddFlagSet(defaultNetRpcFlags.Flags)
  tschCmd.AddCommand(tschDemandCmd, tschCreateCmd)
}

func tschDemandCmdInit() {
  tschDemandFlags := newFlagSet("Task Scheduler")

  tschDemandFlags.Flags.StringVarP(&tschTask, "task", "t", "", "Name or path of the new task")
  tschDemandFlags.Flags.Uint32Var(&tschDemand.SessionId, "session", 0, "Hijack existing session given the session ID")
  tschDemandFlags.Flags.StringVar(&tschDemand.UserSid, "sid", "S-1-5-18", "User SID to impersonate")
  tschDemandFlags.Flags.BoolVar(&tschDemand.NoDelete, "no-delete", false, "Don't delete task after execution")

  tschDemandExecFlags := newFlagSet("Execution")

  registerExecutionFlags(tschDemandExecFlags.Flags)
  registerExecutionOutputFlags(tschDemandExecFlags.Flags)

  cmdFlags[tschDemandCmd] = []*flagSet{
    tschDemandFlags,
    tschDemandExecFlags,
    defaultAuthFlags,
    defaultLogFlags,
    defaultNetRpcFlags,
  }

  tschDemandCmd.Flags().AddFlagSet(tschDemandFlags.Flags)
  tschDemandCmd.Flags().AddFlagSet(tschDemandExecFlags.Flags)
}

func tschCreateCmdInit() {
  tschCreateFlags := newFlagSet("Task Scheduler")

  tschCreateFlags.Flags.StringVarP(&tschTask, "task", "t", "", "Name or path of the new task")
  tschCreateFlags.Flags.DurationVar(&tschCreate.StopDelay, "delay-stop", 5*time.Second, "Delay between task execution and termination. This won't stop the spawned process")
  tschCreateFlags.Flags.DurationVar(&tschCreate.StartDelay, "start-delay", 5*time.Second, "Delay between task registration and execution")
  tschCreateFlags.Flags.DurationVar(&tschCreate.DeleteDelay, "delete-delay", 0*time.Second, "Delay between task termination and deletion")
  tschCreateFlags.Flags.BoolVar(&tschCreate.NoDelete, "no-delete", false, "Don't delete task after execution")
  tschCreateFlags.Flags.BoolVar(&tschCreate.CallDelete, "call-delete", false, "Directly call SchRpcDelete to delete task")
  tschCreateFlags.Flags.StringVar(&tschCreate.UserSid, "sid", "S-1-5-18", "User `SID` to impersonate")

  tschCreateExecFlags := newFlagSet("Execution")

  registerExecutionFlags(tschCreateExecFlags.Flags)
  registerExecutionOutputFlags(tschCreateExecFlags.Flags)

  cmdFlags[tschCreateCmd] = []*flagSet{
    tschCreateFlags,
    tschCreateExecFlags,
    defaultAuthFlags,
    defaultLogFlags,
    defaultNetRpcFlags,
  }

  tschCreateCmd.Flags().AddFlagSet(tschCreateFlags.Flags)
  tschCreateCmd.Flags().AddFlagSet(tschCreateExecFlags.Flags)
}

func argsTask(*cobra.Command, []string) error {
  switch {
  case tschTask == "":
    tschTask = `\` + util.RandomString()
  case tschexec.ValidateTaskPath(tschTask) == nil:
  case tschexec.ValidateTaskName(tschTask) == nil:
    tschTask = `\` + tschTask
  default:
    return fmt.Errorf("invalid task Label or path: %q", tschTask)
  }
  return nil
}

var (
  tschDemand tschexec.TschDemand
  tschCreate tschexec.TschCreate

  tschTask string

  tschCmd = &cobra.Command{
    Use:     "tsch",
    Short:   "Execute with Windows Task Scheduler (MS-TSCH)",
    GroupID: "module",
    Args:    cobra.NoArgs,
  }

  tschDemandCmd = &cobra.Command{
    Use:   "demand [target]",
    Short: "Register a remote scheduled task and demand immediate start",
    Long: `Description:
  Similar to the create method, the demand method will call SchRpcRegisterTask,
  But rather than setting a defined time when the task will start, it will
  additionally call SchRpcRun to forcefully start the task.

References:
  - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/849c131a-64e4-46ef-b015-9d4c599c5167
  - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/77f2250d-500a-40ee-be18-c82f7079c4f0
`,
    Args: args(
      argsRpcClient("cifs"),
      argsOutput("smb"),
      argsTask,
    ),

    Run: func(*cobra.Command, []string) {
      tschDemand.IO = exec
      tschDemand.Client = &rpcClient
      tschDemand.TaskPath = tschTask

      ctx := log.With().
        Str("module", "tsch").
        Str("method", "demand").
        Logger().WithContext(gssapi.NewSecurityContext(context.TODO()))

      if err := goexec.ExecuteCleanMethod(ctx, &tschDemand, &exec); err != nil {
        log.Fatal().Err(err).Msg("Operation failed")
      }
    },
  }
  tschCreateCmd = &cobra.Command{
    Use:   "create [target]",
    Short: "Create a remote scheduled task with an automatic start time",
    Long: `Description:
  The create method calls SchRpcRegisterTask to register a scheduled task
  with an automatic start time.This method avoids directly calling SchRpcRun,
  and can even avoid calling SchRpcDelete by populating the DeleteExpiredTaskAfter
  Setting.

References:
  SchRpcRegisterTask - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/849c131a-64e4-46ef-b015-9d4c599c5167
  SchRpcRun - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/77f2250d-500a-40ee-be18-c82f7079c4f0
  SchRpcDelete - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/360bb9b1-dd2a-4b36-83ee-21f12cb97cff
  DeleteExpiredTaskAfter - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/6bfde6fe-440e-4ddd-b4d6-c8fc0bc06fae
`,
    Args: args(
      argsRpcClient("cifs"),
      argsOutput("smb"),
      argsTask,
    ),

    Run: func(*cobra.Command, []string) {
      tschCreate.Tsch.Client = &rpcClient
      tschCreate.IO = exec
      tschCreate.TaskPath = tschTask

      ctx := log.With().
        Str("module", "tsch").
        Str("method", "create").
        Logger().WithContext(gssapi.NewSecurityContext(context.TODO()))

      if err := goexec.ExecuteCleanMethod(ctx, &tschCreate, &exec); err != nil {
        log.Fatal().Err(err).Msg("Operation failed")
      }
    },
  }
)