package checkresult

import (
	"context"
	"errors"
	"net"

	"mtproxy_checker/internal/checker"
)

// Classify maps a checker error to CLI-style exit codes: 0 OK, 1 generic, 3 proxy closed, 4 timeout.
func Classify(err error) (exitCode int, message string) {
	if err == nil {
		return 0, ""
	}
	if errors.Is(err, checker.ErrProxyClosed) {
		return 3, err.Error()
	}
	if errors.Is(err, checker.ErrNoDataAfterHeader) {
		return 1, err.Error()
	}
	if errors.Is(err, context.DeadlineExceeded) {
		return 4, "timeout"
	}
	var ne net.Error
	if errors.As(err, &ne) && ne.Timeout() {
		return 4, "timeout"
	}
	return 1, err.Error()
}