package logger

import (
	"log/slog"
	"os"
)

// LoggerLevel expresses the desired logging verbosity. Unlike a full log-level
// enum, it only distinguishes between a verbose development mode and a quieter
// production mode; it is converted to an slog.Level by New.
type LoggerLevel int

const (
	// Development enables debug-level output, suitable for local development.
	Development LoggerLevel = iota
	// Production limits output to info level and above.
	Production
)

// toSlogLevel converts a LoggerLevel into the corresponding slog.Level,
// defaulting to info for any unrecognized value.
func toSlogLevel(level LoggerLevel) slog.Level {
	switch level {
	case Development:
		return slog.LevelDebug
	case Production:
		return slog.LevelInfo
	default:
		return slog.LevelInfo
	}
}

// New creates a *slog.Logger that writes to os.Stderr via slog's default
// TextHandler, with its verbosity driven by the given LoggerLevel. This
// replaces the legacy module-level singleton LOGGER; callers own the returned
// logger and thread it through to sub-modules.
func New(level LoggerLevel) *slog.Logger {
	handler := slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
		Level: toSlogLevel(level),
	})
	return slog.New(handler)
}