package egressutil

import (
	"fmt"
	"strings"
)

type ScopeTarget struct {
	Scope    string
	Source   string
	SourceID string
}

func ParseScope(raw string, sanitizeID func(string) string) (ScopeTarget, error) {
	scope := strings.ToLower(strings.TrimSpace(raw))
	switch {
	case scope == "adguardvpn":
		return ScopeTarget{
			Scope:  "adguardvpn",
			Source: "adguardvpn",
		}, nil
	case scope == "system":
		return ScopeTarget{
			Scope:  "system",
			Source: "system",
		}, nil
	case strings.HasPrefix(scope, "transport:"):
		id := strings.TrimSpace(strings.TrimPrefix(scope, "transport:"))
		if sanitizeID != nil {
			id = sanitizeID(id)
		}
		if id == "" {
			return ScopeTarget{}, fmt.Errorf("invalid transport scope id")
		}
		return ScopeTarget{
			Scope:    "transport:" + id,
			Source:   "transport",
			SourceID: id,
		}, nil
	default:
		return ScopeTarget{}, fmt.Errorf("invalid scope, expected adguardvpn|system|transport:<id>")
	}
}