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// Copyright 2017 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"
)

// ReviewersRequest specifies users and teams for a pull request review request.
type ReviewersRequest struct {
	NodeID        *string  `json:"node_id,omitempty"`
	Reviewers     []string `json:"reviewers,omitempty"`
	TeamReviewers []string `json:"team_reviewers,omitempty"`
}

// Reviewers represents reviewers of a pull request.
type Reviewers struct {
	Users []*User `json:"users,omitempty"`
	Teams []*Team `json:"teams,omitempty"`
}

// RequestReviewers creates a review request for the provided reviewers for the specified pull request.
//
// GitHub API docs: https://docs.github.com/en/free-pro-team@latest/rest/reference/pulls/#request-reviewers-for-a-pull-request
func (s *PullRequestsService) RequestReviewers(ctx context.Context, owner, repo string, number int, reviewers ReviewersRequest) (*PullRequest, *Response, error) {
	u := fmt.Sprintf("repos/%s/%s/pulls/%d/requested_reviewers", owner, repo, number)
	req, err := s.client.NewRequest("POST", u, &reviewers)
	if err != nil {
		return nil, nil, err
	}

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

	return r, resp, nil
}

// ListReviewers lists reviewers whose reviews have been requested on the specified pull request.
//
// GitHub API docs: https://docs.github.com/en/free-pro-team@latest/rest/reference/pulls/#list-requested-reviewers-for-a-pull-request
func (s *PullRequestsService) ListReviewers(ctx context.Context, owner, repo string, number int, opts *ListOptions) (*Reviewers, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/pulls/%d/requested_reviewers", owner, repo, number)
	u, err := addOptions(u, opts)
	if err != nil {
		return nil, nil, err
	}

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

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

	return reviewers, resp, nil
}

// RemoveReviewers removes the review request for the provided reviewers for the specified pull request.
//
// GitHub API docs: https://docs.github.com/en/free-pro-team@latest/rest/reference/pulls/#remove-requested-reviewers-from-a-pull-request
func (s *PullRequestsService) RemoveReviewers(ctx context.Context, owner, repo string, number int, reviewers ReviewersRequest) (*Response, error) {
	u := fmt.Sprintf("repos/%s/%s/pulls/%d/requested_reviewers", owner, repo, number)
	req, err := s.client.NewRequest("DELETE", u, &reviewers)
	if err != nil {
		return nil, err
	}

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