package docker

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"

	fw "git.buran.team/main/fairwind"

	mobyregistry "github.com/moby/moby/api/types/registry"
	moby "github.com/moby/moby/client"
)

type Image struct {
	ctx      context.Context
	log      *fw.Log
	client   *Docker
	registry *Registry
	tag      string
	version  string
	pull     bool
}

func NewImage(ctx context.Context, log *fw.Log, client *Docker, registry *Registry, tag string, version string, pull bool) *Image {
	return &Image{
		ctx:      ctx,
		log:      log,
		client:   client,
		registry: registry,
		tag:      tag,
		version:  version,
		pull:     pull,
	}
}

func (this *Image) Registry() *Registry {
	return this.registry
}

func (this *Image) Name() string {
	return fmt.Sprintf("%s/%s:%s", this.registry.address, this.tag, this.version)
}

func (this *Image) Tag() string {
	return this.tag
}

func (this *Image) Version() string {
	return this.version
}

func (this *Image) Pull() error {
	if !this.pull {
		return nil
	}

	credentials, err := credentialsToString(
		this.registry.login,
		this.registry.password,
	)
	if err != nil {
		return fmt.Errorf("can't pull image: %w", err)
	}

	response, err := this.client.Docker.ImagePull(
		this.ctx,
		this.Name(),
		moby.ImagePullOptions{
			RegistryAuth: credentials,
		},
	)
	if err != nil {
		return fmt.Errorf("can't pull image: %w", err)
	}

	err = response.Wait(this.ctx)
	if err != nil {
		return fmt.Errorf("can't pull image: %w", err)
	}

	return nil
}

func credentialsToString(login string, password string) (string, error) {
	encodedJSON, err := json.Marshal(
		&mobyregistry.AuthConfig{
			Username: login,
			Password: password,
		},
	)
	if err != nil {
		return "", fmt.Errorf("can't serialize credentials: %w", err)
	}

	authStr := base64.URLEncoding.EncodeToString(encodedJSON)
	return authStr, nil
}