// Copyright (c) 2026, Pim van Pelt <pim@ipng.ch>

package main

import "strings"

const (
	ansiBlue  = "\x1b[34m"
	ansiRed   = "\x1b[31m"
	ansiReset = "\x1b[0m"
)

// colorEnabled is set by the -color flag in main.
var colorEnabled bool

// label wraps s in dark-blue ANSI when color output is enabled.
// Because every label receives the same fixed-length prefix/suffix, tabwriter
// alignment is preserved: the extra bytes are equal for all rows so relative
// widths remain correct.
func label(s string) string {
	if !colorEnabled {
		return s
	}
	return ansiBlue + s + ansiReset
}

// 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 ANSI when color is enabled.
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 colorEnabled {
		return ansiRed + msg + ansiReset
	}
	return msg
}