Part data model (#950)

packages/tui/internal/id/id.go

@@ -0,0 +1,96 @@
+package id
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+)
+
+const (
+	PrefixSession = "ses"
+	PrefixMessage = "msg"
+	PrefixUser    = "usr"
+	PrefixPart    = "prt"
+)
+
+const length = 26
+
+var (
+	lastTimestamp int64
+	counter       int64
+	mu            sync.Mutex
+)
+
+type Prefix string
+
+const (
+	Session Prefix = PrefixSession
+	Message Prefix = PrefixMessage
+	User    Prefix = PrefixUser
+	Part    Prefix = PrefixPart
+)
+
+func ValidatePrefix(id string, prefix Prefix) bool {
+	return strings.HasPrefix(id, string(prefix))
+}
+
+func Ascending(prefix Prefix, given ...string) string {
+	return generateID(prefix, false, given...)
+}
+
+func Descending(prefix Prefix, given ...string) string {
+	return generateID(prefix, true, given...)
+}
+
+func generateID(prefix Prefix, descending bool, given ...string) string {
+	if len(given) > 0 && given[0] != "" {
+		if !strings.HasPrefix(given[0], string(prefix)) {
+			panic(fmt.Sprintf("ID %s does not start with %s", given[0], string(prefix)))
+		}
+		return given[0]
+	}
+	
+	return generateNewID(prefix, descending)
+}
+
+func randomBase62(length int) string {
+	const chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	result := make([]byte, length)
+	bytes := make([]byte, length)
+	rand.Read(bytes)
+	
+	for i := 0; i < length; i++ {
+		result[i] = chars[bytes[i]%62]
+	}
+	
+	return string(result)
+}
+
+func generateNewID(prefix Prefix, descending bool) string {
+	mu.Lock()
+	defer mu.Unlock()
+	
+	currentTimestamp := time.Now().UnixMilli()
+	
+	if currentTimestamp != lastTimestamp {
+		lastTimestamp = currentTimestamp
+		counter = 0
+	}
+	counter++
+	
+	now := uint64(currentTimestamp)*0x1000 + uint64(counter)
+	
+	if descending {
+		now = ^now
+	}
+	
+	timeBytes := make([]byte, 6)
+	for i := 0; i < 6; i++ {
+		timeBytes[i] = byte((now >> (40 - 8*i)) & 0xff)
+	}
+	
+	return string(prefix) + "_" + hex.EncodeToString(timeBytes) + randomBase62(length-12)
+}