package storage

import (
	"fmt"

	"github.com/deis/builder/pkg/gitreceive/git"
)

const (
	slugTGZName = "slug.tgz"
)

// SlugBuilderInfo contains all of the object storage related information needed to pass to a
// slug builder.
type SlugBuilderInfo struct {
	pushKey string
	pushURL string
	tarKey  string
	tarURL  string
}

// NewSlugBuilderInfo creates and populates a new SlugBuilderInfo based on the given data.
func NewSlugBuilderInfo(s3Endpoint *Endpoint, bucket, appName, slugName string, gitSha *git.SHA) *SlugBuilderInfo {
	tarKey := fmt.Sprintf("home/%s/tar", slugName)
	// this is where the controller tells slugrunner to download the slug from, so we have to
	// tell slugbuilder to upload it to here
	pushKey := fmt.Sprintf("home/%s:git-%s/push", appName, gitSha.Short())

	return &SlugBuilderInfo{
		pushKey: pushKey,
		pushURL: fmt.Sprintf("%s/%s/%s", s3Endpoint.FullURL(), bucket, pushKey),
		tarKey:  tarKey,
		tarURL:  fmt.Sprintf("%s/%s/%s", s3Endpoint.FullURL(), bucket, tarKey),
	}
}

// PushKey returns the object storage key that the slug builder will store the slug in.
// The returned value only contains the path to the folder, not including the final filename.
func (s SlugBuilderInfo) PushKey() string { return s.pushKey }

// PushURL returns the complete object storage URL that the slug builder will store the slug in.
// The returned value only contains the URL to the folder, not including the final filename.
func (s SlugBuilderInfo) PushURL() string { return s.pushURL }

// TarKey returns the object storage key from which the slug builder will download for the tarball
// (from which it uses to build the slug). The returned value only contains the path to the
// folder, not including the final filename.
func (s SlugBuilderInfo) TarKey() string { return s.tarKey }

// TarURL returns the complete object storage URL that the slug builder will download the tarball
// from. The returned value only contains the URL to the folder, not including the final filename.
func (s SlugBuilderInfo) TarURL() string { return s.tarURL }

// AbsoluteSlugObjectKey returns the PushKey plus the final filename of the slug.
func (s SlugBuilderInfo) AbsoluteSlugObjectKey() string { return s.PushKey() + "/" + slugTGZName }

// AbsoluteProcfileKey returns the PushKey plus the standard procfile name.
func (s SlugBuilderInfo) AbsoluteProcfileKey() string { return s.PushKey() + "/Procfile" }

// AbsoluteSlugURL returns the PushURL plus the final filename of the slug.
func (s SlugBuilderInfo) AbsoluteSlugURL() string {
	return s.PushURL() + "/" + slugTGZName
}