package cmd

import (
	"bufio"
	"errors"
	_ "github.com/abelith/spellbook/internal/adapters/json"
	"github.com/spf13/cobra"
	"io"
	"os"
)

func NewExportCmd(app Application) *cobra.Command {
	var format string
	var out string

	cmd := &cobra.Command{
		Use:   "export",
		Short: "Export spellbook",
		Long:  `WIP`,
		RunE: func(cmd *cobra.Command, args []string) (err error) {
			ctx := cmd.Context()

			var w io.Writer = os.Stdout
			if out != "" {
				f, err := os.OpenFile(out, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
				if err != nil {
					return err
				}
				defer func() {
					if innerErr := f.Close(); innerErr != nil {
						err = errors.Join(err, innerErr)
					}
				}()
				w = f
			}

			buf := bufio.NewWriter(w)
			defer func() {
				if innerErr := buf.Flush(); innerErr != nil {
					err = errors.Join(err, innerErr)
				}
			}()

			return app.ExportSpells(ctx, format, buf)
		},
	}

	cmd.Flags().StringVarP(&format, "format", "f", "jsonl", "Output format")
	cmd.Flags().StringVarP(&out, "out", "o", "", "Output")

	return cmd
}