package observability

import (
	"log/slog"
	"os"
	"strings"
)

// NewLogger returns a JSON logger with a stable service field so ECS logs from
// different Go processes can be filtered without relying on container names.
func NewLogger(service string) *slog.Logger {
	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
		AddSource: true,
		Level:     parseLogLevel(os.Getenv("LOG_LEVEL")),
	})
	return slog.New(handler).With("service", service)
}

func parseLogLevel(value string) slog.Level {
	switch strings.ToLower(strings.TrimSpace(value)) {
	case "debug":
		return slog.LevelDebug
	case "warn", "warning":
		return slog.LevelWarn
	case "error":
		return slog.LevelError
	default:
		return slog.LevelInfo
	}
}