package bitbucket

import (
	"fmt"
	"net/url"
	"regexp"
	"strings"

	"github.com/drone/drone/model"
	"github.com/drone/drone/remote/bitbucket/internal"

	"golang.org/x/oauth2"
)

const (
	statusPending = "INPROGRESS"
	statusSuccess = "SUCCESSFUL"
	statusFailure = "FAILED"
)

const (
	descPending  = "this build is pending"
	descSuccess  = "the build was successful"
	descFailure  = "the build failed"
	descBlocked  = "the build requires approval"
	descDeclined = "the build was rejected"
	descError    = "oops, something went wrong"
)

// convertStatus is a helper function used to convert a Drone status to a
// Bitbucket commit status.
func convertStatus(status string) string {
	switch status {
	case model.StatusPending, model.StatusRunning, model.StatusBlocked:
		return statusPending
	case model.StatusSuccess:
		return statusSuccess
	default:
		return statusFailure
	}
}

// convertDesc is a helper function used to convert a Drone status to a
// Bitbucket status description.
func convertDesc(status string) string {
	switch status {
	case model.StatusPending, model.StatusRunning:
		return descPending
	case model.StatusSuccess:
		return descSuccess
	case model.StatusFailure:
		return descFailure
	case model.StatusBlocked:
		return descBlocked
	case model.StatusDeclined:
		return descDeclined
	default:
		return descError
	}
}

// convertRepo is a helper function used to convert a Bitbucket repository
// structure to the common Drone repository structure.
func convertRepo(from *internal.Repo) *model.Repo {
	repo := model.Repo{
		Clone:     cloneLink(from),
		Owner:     strings.Split(from.FullName, "/")[0],
		Name:      strings.Split(from.FullName, "/")[1],
		FullName:  from.FullName,
		Link:      from.Links.Html.Href,
		IsPrivate: from.IsPrivate,
		Avatar:    from.Owner.Links.Avatar.Href,
		Kind:      from.Scm,
		Branch:    "master",
	}
	if repo.Kind == model.RepoHg {
		repo.Branch = "default"
	}
	return &repo
}

// cloneLink is a helper function that tries to extract the clone url from the
// repository object.
func cloneLink(repo *internal.Repo) string {
	var clone string

	// above we manually constructed the repository clone url. below we will
	// iterate through the list of clone links and attempt to instead use the
	// clone url provided by bitbucket.
	for _, link := range repo.Links.Clone {
		if link.Name == "https" {
			clone = link.Href
		}
	}

	// if no repository name is provided, we use the Html link. this excludes the
	// .git suffix, but will still clone the repo.
	if len(clone) == 0 {
		clone = repo.Links.Html.Href
	}

	// if bitbucket tries to automatically populate the user in the url we must
	// strip it out.
	cloneurl, err := url.Parse(clone)
	if err == nil {
		cloneurl.User = nil
		clone = cloneurl.String()
	}

	return clone
}

// convertRepoLite is a helper function used to convert a Bitbucket repository
// structure to the simplified Drone repository structure.
func convertRepoLite(from *internal.Repo) *model.RepoLite {
	return &model.RepoLite{
		Owner:    strings.Split(from.FullName, "/")[0],
		Name:     strings.Split(from.FullName, "/")[1],
		FullName: from.FullName,
		Avatar:   from.Owner.Links.Avatar.Href,
	}
}

// convertUser is a helper function used to convert a Bitbucket user account
// structure to the Drone User structure.
func convertUser(from *internal.Account, token *oauth2.Token) *model.User {
	return &model.User{
		Login:  from.Login,
		Token:  token.AccessToken,
		Secret: token.RefreshToken,
		Expiry: token.Expiry.UTC().Unix(),
		Avatar: from.Links.Avatar.Href,
	}
}

// convertTeamList is a helper function used to convert a Bitbucket team list
// structure to the Drone Team structure.
func convertTeamList(from []*internal.Account) []*model.Team {
	var teams []*model.Team
	for _, team := range from {
		teams = append(teams, convertTeam(team))
	}
	return teams
}

// convertTeam is a helper function used to convert a Bitbucket team account
// structure to the Drone Team structure.
func convertTeam(from *internal.Account) *model.Team {
	return &model.Team{
		Login:  from.Login,
		Avatar: from.Links.Avatar.Href,
	}
}

// convertPullHook is a helper function used to convert a Bitbucket pull request
// hook to the Drone build struct holding commit information.
func convertPullHook(from *internal.PullRequestHook) *model.Build {
	return &model.Build{
		Event:  model.EventPull,
		Commit: from.PullRequest.Dest.Commit.Hash,
		Ref:    fmt.Sprintf("refs/heads/%s", from.PullRequest.Dest.Branch.Name),
		Refspec: fmt.Sprintf("%s:%s",
			from.PullRequest.Source.Branch.Name,
			from.PullRequest.Dest.Branch.Name,
		),
		Remote:    fmt.Sprintf("https://bitbucket.org/%s", from.PullRequest.Source.Repo.FullName),
		Link:      from.PullRequest.Links.Html.Href,
		Branch:    from.PullRequest.Dest.Branch.Name,
		Message:   from.PullRequest.Desc,
		Avatar:    from.Actor.Links.Avatar.Href,
		Author:    from.Actor.Login,
		Sender:    from.Actor.Login,
		Timestamp: from.PullRequest.Updated.UTC().Unix(),
	}
}

// convertPushHook is a helper function used to convert a Bitbucket push
// hook to the Drone build struct holding commit information.
func convertPushHook(hook *internal.PushHook, change *internal.Change) *model.Build {
	build := &model.Build{
		Commit:    change.New.Target.Hash,
		Link:      change.New.Target.Links.Html.Href,
		Branch:    change.New.Name,
		Message:   change.New.Target.Message,
		Avatar:    hook.Actor.Links.Avatar.Href,
		Author:    hook.Actor.Login,
		Sender:    hook.Actor.Login,
		Timestamp: change.New.Target.Date.UTC().Unix(),
	}
	switch change.New.Type {
	case "tag", "annotated_tag", "bookmark":
		build.Event = model.EventTag
		build.Ref = fmt.Sprintf("refs/tags/%s", change.New.Name)
	default:
		build.Event = model.EventPush
		build.Ref = fmt.Sprintf("refs/heads/%s", change.New.Name)
	}
	if len(change.New.Target.Author.Raw) != 0 {
		build.Email = extractEmail(change.New.Target.Author.Raw)
	}
	return build
}

// regex for git author fields ("name <name@mail.tld>")
var reGitMail = regexp.MustCompile("<(.*)>")

// extracts the email from a git commit author string
func extractEmail(gitauthor string) (author string) {
	matches := reGitMail.FindAllStringSubmatch(gitauthor, -1)
	if len(matches) == 1 {
		author = matches[0][1]
	}
	return
}