Server/device/pointer.go

package device

import (
	"git.aiterp.net/lucifer3/server/internal/gentools"
	"log"
	"sort"
	"strings"
)

var exclusivePrefixes = []string{
	"lucifer:name:",
	"lucifer:icon:",
	"lucifer:room:",
	"lucifer:group:",
}

type PointerMatcher interface {
	Match(str string) bool
}

type Pointer struct {
	ID      string   `json:"id"`
	Aliases []string `json:"aliases"`
}

func (p *Pointer) AddAlias(alias string) (added *string, removed *string) {
	if !strings.HasPrefix(alias, "lucifer:") {
		return
	}

	for _, alias2 := range p.Aliases {
		if alias2 == alias {
			return
		}
	}

	for _, prefix := range exclusivePrefixes {
		if strings.HasPrefix(alias, prefix) {
			for i, alias2 := range p.Aliases {
				if strings.HasPrefix(alias2, prefix) {
					p.Aliases = append(p.Aliases[:0:0], p.Aliases...)
					p.Aliases = append(p.Aliases[:i], p.Aliases[i+1:]...)
					removed = gentools.ShallowCopy(&alias2)
					break
				}
			}

			break
		}
	}

	added = gentools.ShallowCopy(&alias)
	p.Aliases = append(p.Aliases, alias)
	sort.Strings(p.Aliases)
	return
}

func (p *Pointer) RemoveAlias(alias string) bool {
	if strings.HasPrefix(alias, "lucifer:name:") {
		// Name cannot be removed like this.
		return false
	}

	for i, alias2 := range p.Aliases {
		if alias2 == alias {
			p.Aliases = append(p.Aliases[:0:0], p.Aliases...)
			p.Aliases = append(p.Aliases[:i], p.Aliases[i+1:]...)
			return true
		}
	}

	return false
}

func (p *Pointer) Name() string {
	for _, alias := range p.Aliases {
		if strings.HasPrefix(alias, "lucifer:name:") {
			return alias
		}
	}

	return ""
}

func (p *Pointer) Matches(matcher PointerMatcher) bool {
	defer func() {
		if err := recover(); err != nil {
			log.Println("[PANIC]", err)
		}
	}()

	if matcher.Match(p.ID) {
		return true
	}
	for _, alias := range p.Aliases {
		if matcher.Match(alias) {
			return true
		}
	}

	return false
}