package convert

import (
	"net/url"
	"os"
	"strings"

	"github.com/Azure/azure-sdk-for-go/profiles/latest/containerinstance/mgmt/containerinstance"
	"github.com/Azure/go-autorest/autorest/to"
	"github.com/docker/cli/cli/config"
	"github.com/docker/cli/cli/config/configfile"
	"github.com/docker/cli/cli/config/types"

	"github.com/docker/api/compose"
)

// Specific username from ACR docs : https://github.com/Azure/acr/blob/master/docs/AAD-OAuth.md#getting-credentials-programatically
const (
	tokenUsername = "00000000-0000-0000-0000-000000000000"
	dockerHub     = "index.docker.io"
)

type registryConfLoader interface {
	getAllRegistryCredentials() (map[string]types.AuthConfig, error)
}

type cliRegistryConfLoader struct {
	cfg *configfile.ConfigFile
}

func (c cliRegistryConfLoader) getAllRegistryCredentials() (map[string]types.AuthConfig, error) {
	return c.cfg.GetAllCredentials()
}

func newCliRegistryConfLoader() cliRegistryConfLoader {
	return cliRegistryConfLoader{
		cfg: config.LoadDefaultConfigFile(os.Stderr),
	}
}

func getRegistryCredentials(project compose.Project, registryLoader registryConfLoader) ([]containerinstance.ImageRegistryCredential, error) {
	allCreds, err := registryLoader.getAllRegistryCredentials()
	if err != nil {
		return nil, err
	}
	usedRegistries := map[string]bool{}
	for _, service := range project.Services {
		imageName := service.Image
		tokens := strings.Split(imageName, "/")
		registry := tokens[0]
		if len(tokens) == 1 { // ! image names can include "." ...
			registry = dockerHub
		} else if !strings.Contains(registry, ".") {
			registry = dockerHub
		}
		usedRegistries[registry] = true
	}
	var registryCreds []containerinstance.ImageRegistryCredential
	for name, oneCred := range allCreds {
		parsedURL, err := url.Parse(name)
		if err != nil {
			return nil, err
		}

		hostname := parsedURL.Host
		if hostname == "" {
			hostname = parsedURL.Path
		}
		if _, ok := usedRegistries[hostname]; ok {
			if oneCred.Username != "" {
				aciCredential := containerinstance.ImageRegistryCredential{
					Server:   to.StringPtr(hostname),
					Password: to.StringPtr(oneCred.Password),
					Username: to.StringPtr(oneCred.Username),
				}
				registryCreds = append(registryCreds, aciCredential)
			} else if oneCred.IdentityToken != "" {
				aciCredential := containerinstance.ImageRegistryCredential{
					Server:   to.StringPtr(hostname),
					Password: to.StringPtr(oneCred.IdentityToken),
					Username: to.StringPtr(tokenUsername),
				}
				registryCreds = append(registryCreds, aciCredential)
			}
		}
	}
	return registryCreds, nil
}