package define

import (
	"math"
	"strings"

	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

const (
	// ExecErrorCodeGeneric is the default error code to return from an exec session if libpod failed
	// prior to calling the runtime
	ExecErrorCodeGeneric = 125
	// ExecErrorCodeCannotInvoke is the error code to return when the runtime fails to invoke a command
	// an example of this can be found by trying to execute a directory:
	// `podman exec -l /etc`
	ExecErrorCodeCannotInvoke = 126
	// ExecErrorCodeNotFound is the error code to return when a command cannot be found
	ExecErrorCodeNotFound = 127
	// ErrorConmonRead is a bogus value that can neither be a valid PID or exit code. It is
	// used because conmon will send a negative value when sending a PID back over a pipe FD
	// to signify something went wrong in the runtime. We need to differentiate between that
	// value and a failure on the podman side of reading that value. Thus, we use ErrorConmonRead
	ErrorConmonRead = math.MinInt32 - 1
)

// TranslateExecErrorToExitCode takes an error and checks whether it
// has a predefined exit code associated. If so, it returns that, otherwise it returns
// the exit code originally stated in libpod.Exec()
func TranslateExecErrorToExitCode(originalEC int, err error) int {
	if errors.Cause(err) == ErrOCIRuntimePermissionDenied {
		return ExecErrorCodeCannotInvoke
	}
	if errors.Cause(err) == ErrOCIRuntimeNotFound {
		return ExecErrorCodeNotFound
	}
	return originalEC
}

// ExitCode reads the error message when failing to executing container process
// and then returns 0 if no error, ExecErrorCodeNotFound if command does not exist, or ExecErrorCodeCannotInvoke for
// all other errors
func ExitCode(err error) int {
	if err == nil {
		return 0
	}
	e := strings.ToLower(err.Error())
	logrus.Debugf("ExitCode msg: %q", e)
	if strings.Contains(e, "not found") ||
		strings.Contains(e, "no such file") {
		return ExecErrorCodeNotFound
	}

	return ExecErrorCodeCannotInvoke
}