// Package obs sets up logging and metrics in one place.
package obs

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

// Options controls logger setup.
type Options struct {
	Level  string // debug, info, warn, error
	Format string // text, json
}

// Setup installs the default slog logger and returns it.
func Setup(o Options) *slog.Logger {
	var lvl slog.Level
	switch strings.ToLower(o.Level) {
	case "debug":
		lvl = slog.LevelDebug
	case "warn":
		lvl = slog.LevelWarn
	case "error":
		lvl = slog.LevelError
	default:
		lvl = slog.LevelInfo
	}

	hopts := &slog.HandlerOptions{Level: lvl}
	var h slog.Handler
	if strings.EqualFold(o.Format, "text") {
		h = slog.NewTextHandler(os.Stderr, hopts)
	} else {
		h = slog.NewJSONHandler(os.Stderr, hopts)
	}

	l := slog.New(h)
	slog.SetDefault(l)
	return l
}