feat: initial Netts energy orchestrator

internal/logger/logger.go

@@ -0,0 +1,49 @@
+package logger
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+	"time"
+)
+
+// New builds a slog.Logger based on level and format configuration.
+func New(level, format string) *slog.Logger {
+	slogLevel := parseLevel(level)
+
+	var handler slog.Handler
+	opts := &slog.HandlerOptions{
+		Level:     slogLevel,
+		AddSource: true,
+		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
+			if a.Key == slog.TimeKey {
+				a.Value = slog.StringValue(time.Now().UTC().Format(time.RFC3339Nano))
+			}
+			return a
+		},
+	}
+
+	switch strings.ToLower(format) {
+	case "json":
+		handler = slog.NewJSONHandler(os.Stdout, opts)
+	default:
+		handler = slog.NewTextHandler(os.Stdout, opts)
+	}
+
+	return slog.New(handler)
+}
+
+func parseLevel(level string) slog.Level {
+	switch strings.ToLower(level) {
+	case "debug":
+		return slog.LevelDebug
+	case "warn", "warning":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	case "info", "":
+		return slog.LevelInfo
+	default:
+		return slog.LevelInfo
+	}
+}