package appctx

import (
	"context"
	"strings"
)

const (
	DefaultAppCode = "lalu"
	HeaderAppCode  = "X-App-Code"
)

type contextKey struct{}

func Normalize(value string) string {
	value = strings.ToLower(strings.TrimSpace(value))
	if value == "" {
		return DefaultAppCode
	}
	return value
}

func WithContext(ctx context.Context, value string) context.Context {
	return context.WithValue(ctx, contextKey{}, Normalize(value))
}

func FromContext(ctx context.Context) string {
	if ctx == nil {
		return DefaultAppCode
	}
	value, _ := ctx.Value(contextKey{}).(string)
	return Normalize(value)
}