package main

import (
	"context"
	"os"
	"time"

	"github.com/google/go-containerregistry/pkg/authn"
	"github.com/google/go-containerregistry/pkg/crane"
	"github.com/google/go-containerregistry/pkg/name"
	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
)

func (util *ImageUtil) pullImage(params *PullImageParams) (*PullImageResult, error) {
	var err error

	ctx, _ := context.WithTimeout(context.Background(), time.Duration(params.Timeout)*time.Second)

	res := &PullImageResult{}
	options := make([]crane.Option, 0)
	options = append(options, crane.WithContext(ctx))
	if params.Username != "" && params.Password != "" {
		ref, err := name.ParseReference(params.Imagepath)
		if err != nil {
			return res, err
		}
		repo := ref.Context()
		if err != nil {
			return res, err
		}
		defaultTransport := &roundTripper{}

		scopes := []string{repo.Scope(transport.PullScope)}

		regName := repo.RegistryStr()
		reg, err := name.NewRegistry(regName)
		if err != nil {
			return res, err
		}
		basicAuth := &authn.Basic{
			Username: params.Username,
			Password: params.Password,
		}
		authTransport, err := transport.NewWithContext(ctx, reg, basicAuth, defaultTransport, scopes)
		if err != nil {
			return res, err
		}
		options = append(options, crane.WithTransport(authTransport))
	} else {
		transport := &roundTripper{}
		options = append(options, crane.WithTransport(transport))
	}

	image, err := crane.Pull(params.Imagepath, options...)
	if err != nil {
		return res, err
	}
	dstDir := makeTmpFileName(params.Filepath)
	err = os.MkdirAll(dstDir, 0750)
	if err != nil {
		return res, err
	}
	err = crane.SaveOCI(image, dstDir)
	if err != nil {
		return res, err
	}
	err = archiveDir(dstDir, params.Filepath)
	if err != nil {
		return res, err
	}
	err = os.RemoveAll(dstDir)
	if err != nil {
		return res, err
	}
	return res, err
}