// SPDX-License-Identifier: Apache-2.0

package main

import (
	"strings"

	cli "git.ipng.ch/ipng/golang-cli"
)

// formatError returns a user-friendly error string. gRPC status errors are
// unwrapped to show only the server's message (no "rpc error: code = ..."
// boilerplate). The result is wrapped in red when color is enabled. The label()
// helper and the ANSI palette now live in the golang-cli library (cli.Label,
// cli.Red, ...); only this gRPC-specific unwrap stays here, wired in as
// App.FormatError.
func formatError(err error) string {
	msg := err.Error()
	// google.golang.org/grpc/status errors format as:
	//   rpc error: code = <Code> desc = <message>
	if i := strings.Index(msg, " desc = "); i >= 0 {
		msg = msg[i+len(" desc = "):]
	}
	if cli.ColorEnabled() {
		return cli.Red + msg + cli.Reset
	}
	return msg
}