package logger

import (
	"fmt"
	"log/slog"
	"os"
	"path/filepath"
	"strings"
)

type Options struct {
	Level    string
	Output   string
	FilePath string
}

func New(opts Options) (*slog.Logger, error) {
	var lvl slog.Level
	if err := lvl.UnmarshalText([]byte(opts.Level)); err != nil {
		lvl = slog.LevelInfo
	}

	output := strings.ToLower(strings.TrimSpace(opts.Output))
	switch output {
	case "", "console":
		handler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: lvl})
		return slog.New(handler), nil
	case "file":
		if strings.TrimSpace(opts.FilePath) == "" {
			return nil, fmt.Errorf("log file path is required")
		}
		if err := os.MkdirAll(filepath.Dir(opts.FilePath), 0o755); err != nil {
			return nil, fmt.Errorf("create log directory: %w", err)
		}
		file, err := os.OpenFile(opts.FilePath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
		if err != nil {
			return nil, fmt.Errorf("open log file: %w", err)
		}
		handler := slog.NewTextHandler(file, &slog.HandlerOptions{Level: lvl})
		return slog.New(handler), nil
	default:
		return nil, fmt.Errorf("unsupported log output: %s", opts.Output)
	}
}