package log

import (
	"log/slog"
	"os"

	slogmulti "github.com/samber/slog-multi"
	"go.uber.org/fx"

	"payouts/internal/config"
)

var Module = fx.Options(
	fx.Provide(NewLogger),
)

// Params represents the module input params
type Params struct {
	fx.In

	AppConfig *config.App
}

func NewLogger(p Params) (*slog.Logger, error) {
	logConfig := p.AppConfig.Log
	opts := &slog.HandlerOptions{
		Level: logConfig.Level,
	}

	handlers := []slog.Handler{}
	if logConfig.StdoutEnabled {
		if logConfig.TextOutput {
			handlers = append(handlers, slog.NewTextHandler(os.Stdout, opts))
		} else {
			handlers = append(handlers, slog.NewJSONHandler(os.Stdout, opts))
		}
	}

	if logConfig.FileEnabled {
		file, err := os.OpenFile(logConfig.FilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
		if err != nil {
			return nil, err
		}

		if logConfig.TextOutput {
			handlers = append(handlers, slog.NewTextHandler(file, opts))
		} else {
			handlers = append(handlers, slog.NewJSONHandler(file, opts))
		}
	}

	logger := slog.New(slogmulti.Fanout(handlers...))
	slog.SetDefault(logger)

	return logger, nil
}