// Copyright 2013 The go-github AUTHORS. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package github

import (
	"context"
	"fmt"
	"strings"
)

// RepositoriesService handles communication with the repository related
// methods of the GitHub API.
//
// GitHub API docs: https://developer.github.com/v3/repos/
type RepositoriesService service

// Repository represents a GitHub repository.
type Repository struct {
	ID               *int             `json:"id,omitempty"`
	Owner            *User            `json:"owner,omitempty"`
	Name             *string          `json:"name,omitempty"`
	FullName         *string          `json:"full_name,omitempty"`
	Description      *string          `json:"description,omitempty"`
	Homepage         *string          `json:"homepage,omitempty"`
	DefaultBranch    *string          `json:"default_branch,omitempty"`
	MasterBranch     *string          `json:"master_branch,omitempty"`
	CreatedAt        *Timestamp       `json:"created_at,omitempty"`
	PushedAt         *Timestamp       `json:"pushed_at,omitempty"`
	UpdatedAt        *Timestamp       `json:"updated_at,omitempty"`
	HTMLURL          *string          `json:"html_url,omitempty"`
	CloneURL         *string          `json:"clone_url,omitempty"`
	GitURL           *string          `json:"git_url,omitempty"`
	MirrorURL        *string          `json:"mirror_url,omitempty"`
	SSHURL           *string          `json:"ssh_url,omitempty"`
	SVNURL           *string          `json:"svn_url,omitempty"`
	Language         *string          `json:"language,omitempty"`
	Fork             *bool            `json:"fork"`
	ForksCount       *int             `json:"forks_count,omitempty"`
	NetworkCount     *int             `json:"network_count,omitempty"`
	OpenIssuesCount  *int             `json:"open_issues_count,omitempty"`
	StargazersCount  *int             `json:"stargazers_count,omitempty"`
	SubscribersCount *int             `json:"subscribers_count,omitempty"`
	WatchersCount    *int             `json:"watchers_count,omitempty"`
	Size             *int             `json:"size,omitempty"`
	AutoInit         *bool            `json:"auto_init,omitempty"`
	Parent           *Repository      `json:"parent,omitempty"`
	Source           *Repository      `json:"source,omitempty"`
	Organization     *Organization    `json:"organization,omitempty"`
	Permissions      *map[string]bool `json:"permissions,omitempty"`
	AllowRebaseMerge *bool            `json:"allow_rebase_merge,omitempty"`
	AllowSquashMerge *bool            `json:"allow_squash_merge,omitempty"`
	AllowMergeCommit *bool            `json:"allow_merge_commit,omitempty"`

	// Only provided when using RepositoriesService.Get while in preview
	License *License `json:"license,omitempty"`

	// Additional mutable fields when creating and editing a repository
	Private           *bool   `json:"private"`
	HasIssues         *bool   `json:"has_issues"`
	HasWiki           *bool   `json:"has_wiki"`
	HasPages          *bool   `json:"has_pages"`
	HasDownloads      *bool   `json:"has_downloads"`
	LicenseTemplate   *string `json:"license_template,omitempty"`
	GitignoreTemplate *string `json:"gitignore_template,omitempty"`

	// Creating an organization repository. Required for non-owners.
	TeamID *int `json:"team_id"`

	// API URLs
	URL              *string `json:"url,omitempty"`
	ArchiveURL       *string `json:"archive_url,omitempty"`
	AssigneesURL     *string `json:"assignees_url,omitempty"`
	BlobsURL         *string `json:"blobs_url,omitempty"`
	BranchesURL      *string `json:"branches_url,omitempty"`
	CollaboratorsURL *string `json:"collaborators_url,omitempty"`
	CommentsURL      *string `json:"comments_url,omitempty"`
	CommitsURL       *string `json:"commits_url,omitempty"`
	CompareURL       *string `json:"compare_url,omitempty"`
	ContentsURL      *string `json:"contents_url,omitempty"`
	ContributorsURL  *string `json:"contributors_url,omitempty"`
	DeploymentsURL   *string `json:"deployments_url,omitempty"`
	DownloadsURL     *string `json:"downloads_url,omitempty"`
	EventsURL        *string `json:"events_url,omitempty"`
	ForksURL         *string `json:"forks_url,omitempty"`
	GitCommitsURL    *string `json:"git_commits_url,omitempty"`
	GitRefsURL       *string `json:"git_refs_url,omitempty"`
	GitTagsURL       *string `json:"git_tags_url,omitempty"`
	HooksURL         *string `json:"hooks_url,omitempty"`
	IssueCommentURL  *string `json:"issue_comment_url,omitempty"`
	IssueEventsURL   *string `json:"issue_events_url,omitempty"`
	IssuesURL        *string `json:"issues_url,omitempty"`
	KeysURL          *string `json:"keys_url,omitempty"`
	LabelsURL        *string `json:"labels_url,omitempty"`
	LanguagesURL     *string `json:"languages_url,omitempty"`
	MergesURL        *string `json:"merges_url,omitempty"`
	MilestonesURL    *string `json:"milestones_url,omitempty"`
	NotificationsURL *string `json:"notifications_url,omitempty"`
	PullsURL         *string `json:"pulls_url,omitempty"`
	ReleasesURL      *string `json:"releases_url,omitempty"`
	StargazersURL    *string `json:"stargazers_url,omitempty"`
	StatusesURL      *string `json:"statuses_url,omitempty"`
	SubscribersURL   *string `json:"subscribers_url,omitempty"`
	SubscriptionURL  *string `json:"subscription_url,omitempty"`
	TagsURL          *string `json:"tags_url,omitempty"`
	TreesURL         *string `json:"trees_url,omitempty"`
	TeamsURL         *string `json:"teams_url,omitempty"`

	// TextMatches is only populated from search results that request text matches
	// See: search.go and https://developer.github.com/v3/search/#text-match-metadata
	TextMatches []TextMatch `json:"text_matches,omitempty"`
}

func (r Repository) String() string {
	return Stringify(r)
}

// RepositoryListOptions specifies the optional parameters to the
// RepositoriesService.List method.
type RepositoryListOptions struct {
	// Visibility of repositories to list. Can be one of all, public, or private.
	// Default: all
	Visibility string `url:"visibility,omitempty"`

	// List repos of given affiliation[s].
	// Comma-separated list of values. Can include:
	// * owner: Repositories that are owned by the authenticated user.
	// * collaborator: Repositories that the user has been added to as a
	//   collaborator.
	// * organization_member: Repositories that the user has access to through
	//   being a member of an organization. This includes every repository on
	//   every team that the user is on.
	// Default: owner,collaborator,organization_member
	Affiliation string `url:"affiliation,omitempty"`

	// Type of repositories to list.
	// Can be one of all, owner, public, private, member. Default: all
	// Will cause a 422 error if used in the same request as visibility or
	// affiliation.
	Type string `url:"type,omitempty"`

	// How to sort the repository list. Can be one of created, updated, pushed,
	// full_name. Default: full_name
	Sort string `url:"sort,omitempty"`

	// Direction in which to sort repositories. Can be one of asc or desc.
	// Default: when using full_name: asc; otherwise desc
	Direction string `url:"direction,omitempty"`

	ListOptions
}

// List the repositories for a user. Passing the empty string will list
// repositories for the authenticated user.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-user-repositories
func (s *RepositoriesService) List(ctx context.Context, user string, opt *RepositoryListOptions) ([]*Repository, *Response, error) {
	var u string
	if user != "" {
		u = fmt.Sprintf("users/%v/repos", user)
	} else {
		u = "user/repos"
	}
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when license support fully launches
	req.Header.Set("Accept", mediaTypeLicensesPreview)

	var repos []*Repository
	resp, err := s.client.Do(ctx, req, &repos)
	if err != nil {
		return nil, resp, err
	}

	return repos, resp, nil
}

// RepositoryListByOrgOptions specifies the optional parameters to the
// RepositoriesService.ListByOrg method.
type RepositoryListByOrgOptions struct {
	// Type of repositories to list. Possible values are: all, public, private,
	// forks, sources, member. Default is "all".
	Type string `url:"type,omitempty"`

	ListOptions
}

// ListByOrg lists the repositories for an organization.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-organization-repositories
func (s *RepositoriesService) ListByOrg(ctx context.Context, org string, opt *RepositoryListByOrgOptions) ([]*Repository, *Response, error) {
	u := fmt.Sprintf("orgs/%v/repos", org)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when license support fully launches
	req.Header.Set("Accept", mediaTypeLicensesPreview)

	var repos []*Repository
	resp, err := s.client.Do(ctx, req, &repos)
	if err != nil {
		return nil, resp, err
	}

	return repos, resp, nil
}

// RepositoryListAllOptions specifies the optional parameters to the
// RepositoriesService.ListAll method.
type RepositoryListAllOptions struct {
	// ID of the last repository seen
	Since int `url:"since,omitempty"`

	ListOptions
}

// ListAll lists all GitHub repositories in the order that they were created.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-all-public-repositories
func (s *RepositoriesService) ListAll(ctx context.Context, opt *RepositoryListAllOptions) ([]*Repository, *Response, error) {
	u, err := addOptions("repositories", opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	var repos []*Repository
	resp, err := s.client.Do(ctx, req, &repos)
	if err != nil {
		return nil, resp, err
	}

	return repos, resp, nil
}

// Create a new repository. If an organization is specified, the new
// repository will be created under that org. If the empty string is
// specified, it will be created for the authenticated user.
//
// GitHub API docs: https://developer.github.com/v3/repos/#create
func (s *RepositoriesService) Create(ctx context.Context, org string, repo *Repository) (*Repository, *Response, error) {
	var u string
	if org != "" {
		u = fmt.Sprintf("orgs/%v/repos", org)
	} else {
		u = "user/repos"
	}

	req, err := s.client.NewRequest("POST", u, repo)
	if err != nil {
		return nil, nil, err
	}

	r := new(Repository)
	resp, err := s.client.Do(ctx, req, r)
	if err != nil {
		return nil, resp, err
	}

	return r, resp, nil
}

// Get fetches a repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#get
func (s *RepositoriesService) Get(ctx context.Context, owner, repo string) (*Repository, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v", owner, repo)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when the license support fully launches
	// https://developer.github.com/v3/licenses/#get-a-repositorys-license
	acceptHeaders := []string{mediaTypeLicensesPreview, mediaTypeSquashPreview}
	req.Header.Set("Accept", strings.Join(acceptHeaders, ", "))

	repository := new(Repository)
	resp, err := s.client.Do(ctx, req, repository)
	if err != nil {
		return nil, resp, err
	}

	return repository, resp, nil
}

// GetByID fetches a repository.
//
// Note: GetByID uses the undocumented GitHub API endpoint /repositories/:id.
func (s *RepositoriesService) GetByID(ctx context.Context, id int) (*Repository, *Response, error) {
	u := fmt.Sprintf("repositories/%d", id)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when the license support fully launches
	// https://developer.github.com/v3/licenses/#get-a-repositorys-license
	req.Header.Set("Accept", mediaTypeLicensesPreview)

	repository := new(Repository)
	resp, err := s.client.Do(ctx, req, repository)
	if err != nil {
		return nil, resp, err
	}

	return repository, resp, nil
}

// Edit updates a repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#edit
func (s *RepositoriesService) Edit(ctx context.Context, owner, repo string, repository *Repository) (*Repository, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v", owner, repo)
	req, err := s.client.NewRequest("PATCH", u, repository)
	if err != nil {
		return nil, nil, err
	}

	// TODO: Remove this preview header after API is fully vetted.
	req.Header.Set("Accept", mediaTypeSquashPreview)

	r := new(Repository)
	resp, err := s.client.Do(ctx, req, r)
	if err != nil {
		return nil, resp, err
	}

	return r, resp, nil
}

// Delete a repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#delete-a-repository
func (s *RepositoriesService) Delete(ctx context.Context, owner, repo string) (*Response, error) {
	u := fmt.Sprintf("repos/%v/%v", owner, repo)
	req, err := s.client.NewRequest("DELETE", u, nil)
	if err != nil {
		return nil, err
	}

	return s.client.Do(ctx, req, nil)
}

// Contributor represents a repository contributor
type Contributor struct {
	Login             *string `json:"login,omitempty"`
	ID                *int    `json:"id,omitempty"`
	AvatarURL         *string `json:"avatar_url,omitempty"`
	GravatarID        *string `json:"gravatar_id,omitempty"`
	URL               *string `json:"url,omitempty"`
	HTMLURL           *string `json:"html_url,omitempty"`
	FollowersURL      *string `json:"followers_url,omitempty"`
	FollowingURL      *string `json:"following_url,omitempty"`
	GistsURL          *string `json:"gists_url,omitempty"`
	StarredURL        *string `json:"starred_url,omitempty"`
	SubscriptionsURL  *string `json:"subscriptions_url,omitempty"`
	OrganizationsURL  *string `json:"organizations_url,omitempty"`
	ReposURL          *string `json:"repos_url,omitempty"`
	EventsURL         *string `json:"events_url,omitempty"`
	ReceivedEventsURL *string `json:"received_events_url,omitempty"`
	Type              *string `json:"type,omitempty"`
	SiteAdmin         *bool   `json:"site_admin"`
	Contributions     *int    `json:"contributions,omitempty"`
}

// ListContributorsOptions specifies the optional parameters to the
// RepositoriesService.ListContributors method.
type ListContributorsOptions struct {
	// Include anonymous contributors in results or not
	Anon string `url:"anon,omitempty"`

	ListOptions
}

// ListContributors lists contributors for a repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-contributors
func (s *RepositoriesService) ListContributors(ctx context.Context, owner string, repository string, opt *ListContributorsOptions) ([]*Contributor, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/contributors", owner, repository)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	var contributor []*Contributor
	resp, err := s.client.Do(ctx, req, &contributor)
	if err != nil {
		return nil, nil, err
	}

	return contributor, resp, nil
}

// ListLanguages lists languages for the specified repository. The returned map
// specifies the languages and the number of bytes of code written in that
// language. For example:
//
//     {
//       "C": 78769,
//       "Python": 7769
//     }
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-languages
func (s *RepositoriesService) ListLanguages(ctx context.Context, owner string, repo string) (map[string]int, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/languages", owner, repo)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	languages := make(map[string]int)
	resp, err := s.client.Do(ctx, req, &languages)
	if err != nil {
		return nil, resp, err
	}

	return languages, resp, nil
}

// ListTeams lists the teams for the specified repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-teams
func (s *RepositoriesService) ListTeams(ctx context.Context, owner string, repo string, opt *ListOptions) ([]*Team, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/teams", owner, repo)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	var teams []*Team
	resp, err := s.client.Do(ctx, req, &teams)
	if err != nil {
		return nil, resp, err
	}

	return teams, resp, nil
}

// RepositoryTag represents a repository tag.
type RepositoryTag struct {
	Name       *string `json:"name,omitempty"`
	Commit     *Commit `json:"commit,omitempty"`
	ZipballURL *string `json:"zipball_url,omitempty"`
	TarballURL *string `json:"tarball_url,omitempty"`
}

// ListTags lists tags for the specified repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-tags
func (s *RepositoriesService) ListTags(ctx context.Context, owner string, repo string, opt *ListOptions) ([]*RepositoryTag, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/tags", owner, repo)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	var tags []*RepositoryTag
	resp, err := s.client.Do(ctx, req, &tags)
	if err != nil {
		return nil, resp, err
	}

	return tags, resp, nil
}

// Branch represents a repository branch
type Branch struct {
	Name      *string           `json:"name,omitempty"`
	Commit    *RepositoryCommit `json:"commit,omitempty"`
	Protected *bool             `json:"protected,omitempty"`
}

// Protection represents a repository branch's protection.
type Protection struct {
	RequiredStatusChecks       *RequiredStatusChecks       `json:"required_status_checks"`
	RequiredPullRequestReviews *RequiredPullRequestReviews `json:"required_pull_request_reviews"`
	EnforceAdmins              *AdminEnforcement           `json:"enforce_admins"`
	Restrictions               *BranchRestrictions         `json:"restrictions"`
}

// ProtectionRequest represents a request to create/edit a branch's protection.
type ProtectionRequest struct {
	RequiredStatusChecks       *RequiredStatusChecks       `json:"required_status_checks"`
	RequiredPullRequestReviews *RequiredPullRequestReviews `json:"required_pull_request_reviews"`
	EnforceAdmins              bool                        `json:"enforce_admins"`
	Restrictions               *BranchRestrictionsRequest  `json:"restrictions"`
}

// RequiredStatusChecks represents the protection status of a individual branch.
type RequiredStatusChecks struct {
	// Enforce required status checks for repository administrators. (Required.)
	// Deprecated: Use EnforceAdmins instead.
	IncludeAdmins bool `json:"include_admins"`
	// Require branches to be up to date before merging. (Required.)
	Strict bool `json:"strict"`
	// The list of status checks to require in order to merge into this
	// branch. (Required; use []string{} instead of nil for empty list.)
	Contexts []string `json:"contexts"`
}

// RequiredPullRequestReviews represents the protection configuration for pull requests.
type RequiredPullRequestReviews struct {
	// Enforce pull request reviews for repository administrators. (Required.)
	// Deprecated: Use EnforceAdmins instead.
	IncludeAdmins bool `json:"include_admins"`
}

// AdminEnforcement represents the configuration to enforce required status checks for repository administrators.
type AdminEnforcement struct {
	URL     *string `json:"url,omitempty"`
	Enabled bool    `json:"enabled"`
}

// BranchRestrictions represents the restriction that only certain users or
// teams may push to a branch.
type BranchRestrictions struct {
	// The list of user logins with push access.
	Users []*User `json:"users"`
	// The list of team slugs with push access.
	Teams []*Team `json:"teams"`
}

// BranchRestrictionsRequest represents the request to create/edit the
// restriction that only certain users or teams may push to a branch. It is
// separate from BranchRestrictions above because the request structure is
// different from the response structure.
type BranchRestrictionsRequest struct {
	// The list of user logins with push access. (Required; use []string{} instead of nil for empty list.)
	Users []string `json:"users"`
	// The list of team slugs with push access. (Required; use []string{} instead of nil for empty list.)
	Teams []string `json:"teams"`
}

// ListBranches lists branches for the specified repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#list-branches
func (s *RepositoriesService) ListBranches(ctx context.Context, owner string, repo string, opt *ListOptions) ([]*Branch, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/branches", owner, repo)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	var branches []*Branch
	resp, err := s.client.Do(ctx, req, &branches)
	if err != nil {
		return nil, resp, err
	}

	return branches, resp, nil
}

// GetBranch gets the specified branch for a repository.
//
// GitHub API docs: https://developer.github.com/v3/repos/#get-branch
func (s *RepositoriesService) GetBranch(ctx context.Context, owner, repo, branch string) (*Branch, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/branches/%v", owner, repo, branch)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	b := new(Branch)
	resp, err := s.client.Do(ctx, req, b)
	if err != nil {
		return nil, resp, err
	}

	return b, resp, nil
}

// GetBranchProtection gets the protection of a given branch.
//
// GitHub API docs: https://developer.github.com/v3/repos/branches/#get-branch-protection
func (s *RepositoriesService) GetBranchProtection(ctx context.Context, owner, repo, branch string) (*Protection, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/branches/%v/protection", owner, repo, branch)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	p := new(Protection)
	resp, err := s.client.Do(ctx, req, p)
	if err != nil {
		return nil, resp, err
	}

	return p, resp, nil
}

// GetRequiredStatusChecks gets the required status checks for a given protected branch.
//
// GitHub API docs: https://developer.github.com/v3/repos/branches/#get-required-status-checks-of-protected-branch
func (s *RepositoriesService) GetRequiredStatusChecks(ctx context.Context, owner, repo, branch string) (*RequiredStatusChecks, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/branches/%v/protection/required_status_checks", owner, repo, branch)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	p := new(RequiredStatusChecks)
	resp, err := s.client.Do(ctx, req, p)
	if err != nil {
		return nil, resp, err
	}

	return p, resp, nil
}

// ListRequiredStatusChecksContexts lists the required status checks contexts for a given protected branch.
//
// GitHub API docs: https://developer.github.com/v3/repos/branches/#list-required-status-checks-contexts-of-protected-branch
func (s *RepositoriesService) ListRequiredStatusChecksContexts(ctx context.Context, owner, repo, branch string) (contexts []string, resp *Response, err error) {
	u := fmt.Sprintf("repos/%v/%v/branches/%v/protection/required_status_checks/contexts", owner, repo, branch)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	resp, err = s.client.Do(ctx, req, &contexts)
	if err != nil {
		return nil, resp, err
	}

	return contexts, resp, nil
}

// UpdateBranchProtection updates the protection of a given branch.
//
// GitHub API docs: https://developer.github.com/v3/repos/branches/#update-branch-protection
func (s *RepositoriesService) UpdateBranchProtection(ctx context.Context, owner, repo, branch string, preq *ProtectionRequest) (*Protection, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/branches/%v/protection", owner, repo, branch)
	req, err := s.client.NewRequest("PUT", u, preq)
	if err != nil {
		return nil, nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	p := new(Protection)
	resp, err := s.client.Do(ctx, req, p)
	if err != nil {
		return nil, resp, err
	}

	return p, resp, nil
}

// RemoveBranchProtection removes the protection of a given branch.
//
// GitHub API docs: https://developer.github.com/v3/repos/branches/#remove-branch-protection
func (s *RepositoriesService) RemoveBranchProtection(ctx context.Context, owner, repo, branch string) (*Response, error) {
	u := fmt.Sprintf("repos/%v/%v/branches/%v/protection", owner, repo, branch)
	req, err := s.client.NewRequest("DELETE", u, nil)
	if err != nil {
		return nil, err
	}

	// TODO: remove custom Accept header when this API fully launches
	req.Header.Set("Accept", mediaTypeProtectedBranchesPreview)

	return s.client.Do(ctx, req, nil)
}

// License gets the contents of a repository's license if one is detected.
//
// GitHub API docs: https://developer.github.com/v3/licenses/#get-the-contents-of-a-repositorys-license
func (s *RepositoriesService) License(ctx context.Context, owner, repo string) (*RepositoryLicense, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/license", owner, repo)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	r := &RepositoryLicense{}
	resp, err := s.client.Do(ctx, req, r)
	if err != nil {
		return nil, resp, err
	}

	return r, resp, nil
}
