package app

import (
	"context"
	"fmt"
	"io"

	"gitea.maximumdirect.net/eric/distributor/internal/adapters/local"
	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
)

type InspectOptions struct {
	Path   string
	Stdout io.Writer
}

func Inspect(ctx context.Context, options InspectOptions) error {
	if options.Path == "" {
		return fmt.Errorf("inspect command requires a path")
	}
	backend, err := local.New(options.Path)
	if err != nil {
		return err
	}
	bundles, err := bundle.Discover(ctx, backend, "")
	if err != nil {
		return err
	}
	return writeInspection(options.Stdout, bundles)
}

func writeInspection(w io.Writer, bundles []bundle.Bundle) error {
	if w == nil {
		return nil
	}
	if _, err := fmt.Fprintf(w, "Bundles: %d\n", len(bundles)); err != nil {
		return err
	}
	for _, sourceBundle := range bundles {
		if _, err := fmt.Fprintf(
			w,
			"- path=%s id=%s created=%s digest=%s files=%d\n",
			displayBundlePath(sourceBundle.RootRelativePath),
			sourceBundle.Manifest.ID,
			sourceBundle.Manifest.Created.Format("2006-01-02T15:04:05Z07:00"),
			sourceBundle.Manifest.Digest,
			len(sourceBundle.Manifest.Files),
		); err != nil {
			return err
		}
		for _, file := range sourceBundle.Manifest.Files {
			if _, err := fmt.Fprintf(w, "  - %s size=%d sha256=%s\n", file.Path, file.Size, file.SHA256); err != nil {
				return err
			}
		}
	}
	return nil
}

func displayBundlePath(path string) string {
	if path == "" {
		return "."
	}
	return path
}