package process

import (
	"fmt"
	"strconv"
	"strings"
)

// WorkerKey is the unique identity of ONE forward's worker process:
//
//	"<local>~<remote>~<port>"
//
// The per-forward worker model gives every link its own frpc process, config
// file and log file. This fixes the multi-node proxy-name fight of the old
// per-remote model (every node rendered the SAME proxy list and raced to
// register them on frps -> "proxy already exists"), and isolates faults: one
// crashing forward can no longer take its siblings down.
//
// '~' is a legal filename character on every supported OS (including Windows,
// unlike ':') and is rare in user-chosen node names. ParseWorkerKey rejects
// malformed keys so callers fail loudly instead of silently mis-rendering.
func WorkerKey(local, remote string, port int) string {
	return fmt.Sprintf("%s~%s~%d", local, remote, port)
}

// ParseWorkerKey splits a worker key back into its (local, remote, port)
// forward triple. ok=false for anything that is not a well-formed key
// (e.g. legacy per-remote worker names).
func ParseWorkerKey(key string) (local, remote string, port int, ok bool) {
	parts := strings.Split(key, "~")
	if len(parts) != 3 {
		return "", "", 0, false
	}
	p, err := strconv.Atoi(parts[2])
	if err != nil || parts[0] == "" || parts[1] == "" || p <= 0 {
		return "", "", 0, false
	}
	return parts[0], parts[1], p, true
}