// ParsePullRequestHook parses the pull request hook from the Request body
// and returns the required data in a standard format.
func (r *GitHub) ParsePullRequestHook(req *http.Request) (*model.Hook, error) {

	// parse the payload to retrieve the pull-request
	// hook meta-data.
	var payload = GetPayload(req)
	var data, err = github.ParsePullRequestHook(payload)
	if err != nil {
		return nil, err
	}

	// ignore these
	if data.Action != "opened" && data.Action != "synchronize" {
		return nil, nil
	}

	// TODO we should also store the pull request branch (ie from x to y)
	//      we can find it here: data.PullRequest.Head.Ref
	var hook = model.Hook{
		Owner:       data.Repo.Owner.Login,
		Repo:        data.Repo.Name,
		Sha:         data.PullRequest.Head.Sha,
		Branch:      data.PullRequest.Head.Ref,
		Author:      data.PullRequest.User.Login,
		Gravatar:    data.PullRequest.User.GravatarId,
		Timestamp:   time.Now().UTC().String(),
		Message:     data.PullRequest.Title,
		PullRequest: strconv.Itoa(data.Number),
	}

	if len(hook.Owner) == 0 {
		hook.Owner = data.Repo.Owner.Name
	}

	return &hook, nil
}

// ParseHook parses the post-commit hook from the Request body
// and returns the required data in a standard format.
func (r *Gitlab) ParseHook(req *http.Request) (*model.Hook, error) {

	defer req.Body.Close()
	var payload, _ = ioutil.ReadAll(req.Body)
	var parsed, err = gogitlab.ParseHook(payload)
	if err != nil {
		return nil, err
	}

	if len(parsed.After) == 0 || parsed.TotalCommitsCount == 0 {
		return nil, nil
	}

	if parsed.ObjectKind == "merge_request" {
		// TODO (bradrydzewski) figure out how to handle merge requests
		return nil, nil
	}

	if len(parsed.After) == 0 {
		return nil, nil
	}

	var hook = new(model.Hook)
	hook.Owner = req.FormValue("owner")
	hook.Repo = req.FormValue("name")
	hook.Sha = parsed.After
	hook.Branch = parsed.Branch()

	var head = parsed.Head()
	hook.Message = head.Message
	hook.Timestamp = head.Timestamp

	// extracts the commit author (ideally email)
	// from the post-commit hook
	switch {
	case head.Author != nil:
		hook.Author = head.Author.Email
	case head.Author == nil:
		hook.Author = parsed.UserName
	}

	return hook, nil
}

// ParseHook parses the post-commit hook from the Request body
// and returns the required data in a standard format.
func (r *GitHub) ParseHook(req *http.Request) (*model.Hook, error) {
	// handle github ping
	if req.Header.Get("X-Github-Event") == "ping" {
		return nil, nil
	}

	// handle github pull request hook differently
	if req.Header.Get("X-Github-Event") == "pull_request" {
		return r.ParsePullRequestHook(req)
	}

	// parse the github Hook payload
	var payload = GetPayload(req)
	var data, err = github.ParseHook(payload)
	if err != nil {
		return nil, nil
	}

	// make sure this is being triggered because of a commit
	// and not something like a tag deletion or whatever
	if data.IsTag() ||
		data.IsGithubPages() ||
		data.IsHead() == false ||
		data.IsDeleted() {
		return nil, nil
	}

	var hook = new(model.Hook)
	hook.Repo = data.Repo.Name
	hook.Owner = data.Repo.Owner.Login
	hook.Sha = data.Head.Id
	hook.Branch = data.Branch()

	if len(hook.Owner) == 0 {
		hook.Owner = data.Repo.Owner.Name
	}

	// extract the author and message from the commit
	// this is kind of experimental, since I don't know
	// what I'm doing here.
	if data.Head != nil && data.Head.Author != nil {
		hook.Message = data.Head.Message
		hook.Timestamp = data.Head.Timestamp
		hook.Author = data.Head.Author.Email
	} else if data.Commits != nil && len(data.Commits) > 0 && data.Commits[0].Author != nil {
		hook.Message = data.Commits[0].Message
		hook.Timestamp = data.Commits[0].Timestamp
		hook.Author = data.Commits[0].Author.Email
	}

	return hook, nil
}