package main

import (
	"crypto/tls"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"os"
	"path"
	"time"

	"github.com/google/uuid"
	"github.com/osbuild/osbuild-composer/internal/common"
	"github.com/osbuild/osbuild-composer/internal/distro"
	osbuild "github.com/osbuild/osbuild-composer/internal/osbuild1"
	"github.com/osbuild/osbuild-composer/internal/target"
	"github.com/osbuild/osbuild-composer/internal/upload/awsupload"
	"github.com/osbuild/osbuild-composer/internal/upload/azure"
	"github.com/osbuild/osbuild-composer/internal/upload/koji"
	"github.com/osbuild/osbuild-composer/internal/upload/vmware"
	"github.com/osbuild/osbuild-composer/internal/worker"
)

type OSBuildJobImpl struct {
	Store       string
	Output      string
	KojiServers map[string]koji.GSSAPICredentials
}

func packageMetadataToSignature(pkg osbuild.RPMPackageMetadata) *string {
	if pkg.SigGPG != "" {
		return &pkg.SigGPG
	} else if pkg.SigPGP != "" {
		return &pkg.SigPGP
	}
	return nil
}

func osbuildStagesToRPMs(stages []osbuild.StageResult) []koji.RPM {
	rpms := make([]koji.RPM, 0)
	for _, stage := range stages {
		switch metadata := stage.Metadata.(type) {
		case *osbuild.RPMStageMetadata:
			for _, pkg := range metadata.Packages {
				rpms = append(rpms, koji.RPM{
					Type:      "rpm",
					Name:      pkg.Name,
					Epoch:     pkg.Epoch,
					Version:   pkg.Version,
					Release:   pkg.Release,
					Arch:      pkg.Arch,
					Sigmd5:    pkg.SigMD5,
					Signature: packageMetadataToSignature(pkg),
				})
			}
		default:
			continue
		}
	}
	return rpms
}

func (impl *OSBuildJobImpl) Run(job worker.Job) error {
	outputDirectory, err := ioutil.TempDir(impl.Output, job.Id().String()+"-*")
	if err != nil {
		return fmt.Errorf("error creating temporary output directory: %v", err)
	}
	defer func() {
		err := os.RemoveAll(outputDirectory)
		if err != nil {
			log.Printf("Error removing temporary output directory (%s): %v", outputDirectory, err)
		}
	}()

	var args worker.OSBuildJob
	err = job.Args(&args)
	if err != nil {
		return err
	}

	exports := args.Exports
	if len(exports) == 0 {
		// job did not define exports, likely coming from an older version of composer
		// fall back to default "assembler"
		exports = []string{"assembler"}
	} else if len(exports) > 1 {
		// this worker only supports returning one (1) export
		return fmt.Errorf("at most one build artifact can be exported")
	}

	start_time := time.Now()

	osbuildOutput, err := RunOSBuild(args.Manifest, impl.Store, outputDirectory, exports, os.Stderr)
	if err != nil {
		return err
	}

	end_time := time.Now()

	streamOptimizedPath := ""

	// NOTE: Currently OSBuild supports multiple exports, but this isn't used
	// by any of the image types and it can't be specified during the request.
	// Use the first (and presumably only) export for the imagePath.
	exportPath := exports[0]
	if osbuildOutput.Success && args.ImageName != "" {
		var f *os.File
		imagePath := path.Join(outputDirectory, exportPath, args.ImageName)
		if args.StreamOptimized {
			f, err = vmware.OpenAsStreamOptimizedVmdk(imagePath)
			if err != nil {
				return err
			}
			streamOptimizedPath = f.Name()
		} else {
			f, err = os.Open(imagePath)
			if err != nil {
				return err
			}
		}
		err = job.UploadArtifact(args.ImageName, f)
		if err != nil {
			return err
		}
	}

	var r []error

	for _, t := range args.Targets {
		switch options := t.Options.(type) {
		case *target.LocalTargetOptions:
			if !osbuildOutput.Success {
				continue
			}
			var f *os.File
			imagePath := path.Join(outputDirectory, exportPath, options.Filename)
			if options.StreamOptimized {
				f, err = vmware.OpenAsStreamOptimizedVmdk(imagePath)
				if err != nil {
					r = append(r, err)
					continue
				}
			} else {
				f, err = os.Open(imagePath)
				if err != nil {
					r = append(r, err)
					continue
				}
			}

			err = job.UploadArtifact(options.Filename, f)
			if err != nil {
				r = append(r, err)
				continue
			}
		case *target.VMWareTargetOptions:
			if !osbuildOutput.Success {
				continue
			}

			credentials := vmware.Credentials{
				Username:   options.Username,
				Password:   options.Password,
				Host:       options.Host,
				Cluster:    options.Cluster,
				Datacenter: options.Datacenter,
				Datastore:  options.Datastore,
			}

			tempDirectory, err := ioutil.TempDir(impl.Output, job.Id().String()+"-vmware-*")
			if err != nil {
				r = append(r, err)
				continue
			}

			defer func() {
				err := os.RemoveAll(tempDirectory)
				if err != nil {
					log.Printf("Error removing temporary directory for vmware symlink(%s): %v", tempDirectory, err)
				}
			}()

			// create a symlink so that uploaded image has the name specified by user
			imageName := t.ImageName + ".vmdk"
			imagePath := path.Join(tempDirectory, imageName)
			err = os.Symlink(streamOptimizedPath, imagePath)
			if err != nil {
				r = append(r, err)
				continue
			}

			err = vmware.UploadImage(credentials, imagePath)
			if err != nil {
				r = append(r, err)
				continue
			}

		case *target.AWSTargetOptions:
			if !osbuildOutput.Success {
				continue
			}
			a, err := awsupload.New(options.Region, options.AccessKeyID, options.SecretAccessKey)
			if err != nil {
				r = append(r, err)
				continue
			}

			key := options.Key
			if key == "" {
				key = uuid.New().String()
			}

			_, err = a.Upload(path.Join(outputDirectory, options.Filename), options.Bucket, key)
			if err != nil {
				r = append(r, err)
				continue
			}

			/* TODO: communicate back the AMI */
			_, err = a.Register(t.ImageName, options.Bucket, key, options.ShareWithAccounts, common.CurrentArch())
			if err != nil {
				r = append(r, err)
				continue
			}
		case *target.AzureTargetOptions:
			if !osbuildOutput.Success {
				continue
			}
			credentials := azure.Credentials{
				StorageAccount:   options.StorageAccount,
				StorageAccessKey: options.StorageAccessKey,
			}
			metadata := azure.ImageMetadata{
				ContainerName: options.Container,
				ImageName:     t.ImageName,
			}

			const azureMaxUploadGoroutines = 4
			err := azure.UploadImage(
				credentials,
				metadata,
				path.Join(outputDirectory, options.Filename),
				azureMaxUploadGoroutines,
			)

			if err != nil {
				r = append(r, err)
				continue
			}
		case *target.KojiTargetOptions:
			// Koji for some reason needs TLS renegotiation enabled.
			// Clone the default http transport and enable renegotiation.
			transport := http.DefaultTransport.(*http.Transport).Clone()
			transport.TLSClientConfig = &tls.Config{
				Renegotiation: tls.RenegotiateOnceAsClient,
			}

			kojiServer, _ := url.Parse(options.Server)
			creds, exists := impl.KojiServers[kojiServer.Hostname()]
			if !exists {
				r = append(r, fmt.Errorf("Koji server has not been configured: %s", kojiServer.Hostname()))
				continue
			}

			k, err := koji.NewFromGSSAPI(options.Server, &creds, transport)
			if err != nil {
				r = append(r, err)
				continue
			}

			defer func() {
				err := k.Logout()
				if err != nil {
					log.Printf("koji logout failed: %v", err)
				}
			}()

			if !osbuildOutput.Success {
				err = k.CGFailBuild(int(options.BuildID), options.Token)
				if err != nil {
					log.Printf("CGFailBuild failed: %v", err)
				}
				continue
			}

			f, err := os.Open(path.Join(outputDirectory, options.Filename))
			if err != nil {
				r = append(r, err)
				continue
			}

			hash, filesize, err := k.Upload(f, options.UploadDirectory, options.KojiFilename)
			if err != nil {
				r = append(r, err)
				continue
			}

			hostOS, err := distro.GetRedHatRelease()
			if err != nil {
				r = append(r, err)
				continue
			}

			build := koji.ImageBuild{
				BuildID:   options.BuildID,
				TaskID:    options.TaskID,
				Name:      options.Name,
				Version:   options.Version,
				Release:   options.Release,
				StartTime: start_time.Unix(),
				EndTime:   end_time.Unix(),
			}
			buildRoots := []koji.BuildRoot{
				{
					ID: 1,
					Host: koji.Host{
						Os:   hostOS,
						Arch: common.CurrentArch(),
					},
					ContentGenerator: koji.ContentGenerator{
						Name:    "osbuild",
						Version: "0", // TODO: put the correct version here
					},
					Container: koji.Container{
						Type: "none",
						Arch: common.CurrentArch(),
					},
					Tools: []koji.Tool{},
					RPMs:  osbuildStagesToRPMs(osbuildOutput.Build.Stages),
				},
			}
			output := []koji.Image{
				{
					BuildRootID:  1,
					Filename:     options.KojiFilename,
					FileSize:     uint64(filesize),
					Arch:         common.CurrentArch(),
					ChecksumType: "md5",
					MD5:          hash,
					Type:         "image",
					RPMs:         osbuildStagesToRPMs(osbuildOutput.Stages),
					Extra: koji.ImageExtra{
						Info: koji.ImageExtraInfo{
							Arch: "noarch",
						},
					},
				},
			}

			_, err = k.CGImport(build, buildRoots, output, options.UploadDirectory, options.Token)
			if err != nil {
				r = append(r, err)
				continue
			}
		default:
			r = append(r, fmt.Errorf("invalid target type"))
		}
	}

	var targetErrors []string
	for _, err := range r {
		targetErrors = append(targetErrors, err.Error())
	}

	var uploadstatus string = "failure"
	if len(targetErrors) == 0 {
		uploadstatus = "success"
	}

	err = job.Update(&worker.OSBuildJobResult{
		Success:       osbuildOutput.Success && len(targetErrors) == 0,
		OSBuildOutput: osbuildOutput,
		TargetErrors:  targetErrors,
		UploadStatus:  uploadstatus,
	})
	if err != nil {
		return fmt.Errorf("Error reporting job result: %v", err)
	}

	return nil
}