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//
// Copyright 2021, Sander van Harmelen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

package gitlab

import (
	"fmt"
	"net/http"
)

// GroupLabelsService handles communication with the label related methods of the
// GitLab API.
//
// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html
type GroupLabelsService struct {
	client *Client
}

// GroupLabel represents a GitLab group label.
//
// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html
type GroupLabel Label

func (l GroupLabel) String() string {
	return Stringify(l)
}

// ListGroupLabelsOptions represents the available ListGroupLabels() options.
//
// GitLab API docs: https://docs.gitlab.com/ce/api/labels.html#list-labels
type ListGroupLabelsOptions ListOptions

// ListGroupLabels gets all labels for given group.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#list-group-labels
func (s *GroupLabelsService) ListGroupLabels(gid interface{}, opt *ListGroupLabelsOptions, options ...RequestOptionFunc) ([]*GroupLabel, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/labels", pathEscape(group))

	req, err := s.client.NewRequest(http.MethodGet, u, opt, options)
	if err != nil {
		return nil, nil, err
	}

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

	return l, resp, err
}

// GetGroupLabel get a single label for a given group.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#get-a-single-group-label
func (s *GroupLabelsService) GetGroupLabel(gid interface{}, labelID interface{}, options ...RequestOptionFunc) (*GroupLabel, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	label, err := parseID(labelID)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/labels/%s", pathEscape(group), label)

	req, err := s.client.NewRequest(http.MethodGet, u, nil, options)
	if err != nil {
		return nil, nil, err
	}

	var l *GroupLabel
	resp, err := s.client.Do(req, &l)
	if err != nil {
		return nil, resp, err
	}

	return l, resp, err
}

// CreateGroupLabelOptions represents the available CreateGroupLabel() options.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#create-a-new-group-label
type CreateGroupLabelOptions CreateLabelOptions

// CreateGroupLabel creates a new label for given group with given name and
// color.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#create-a-new-group-label
func (s *GroupLabelsService) CreateGroupLabel(gid interface{}, opt *CreateGroupLabelOptions, options ...RequestOptionFunc) (*GroupLabel, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/labels", pathEscape(group))

	req, err := s.client.NewRequest(http.MethodPost, u, opt, options)
	if err != nil {
		return nil, nil, err
	}

	l := new(GroupLabel)
	resp, err := s.client.Do(req, l)
	if err != nil {
		return nil, resp, err
	}

	return l, resp, err
}

// DeleteGroupLabelOptions represents the available DeleteGroupLabel() options.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#delete-a-group-label
type DeleteGroupLabelOptions DeleteLabelOptions

// DeleteGroupLabel deletes a group label given by its name.
//
// GitLab API docs: https://docs.gitlab.com/ce/api/labels.html#delete-a-label
func (s *GroupLabelsService) DeleteGroupLabel(gid interface{}, opt *DeleteGroupLabelOptions, options ...RequestOptionFunc) (*Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, err
	}
	u := fmt.Sprintf("groups/%s/labels", pathEscape(group))

	req, err := s.client.NewRequest(http.MethodDelete, u, opt, options)
	if err != nil {
		return nil, err
	}

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

// UpdateGroupLabelOptions represents the available UpdateGroupLabel() options.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#update-a-group-label
type UpdateGroupLabelOptions UpdateLabelOptions

// UpdateGroupLabel updates an existing label with new name or now color. At least
// one parameter is required, to update the label.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#update-a-group-label
func (s *GroupLabelsService) UpdateGroupLabel(gid interface{}, opt *UpdateGroupLabelOptions, options ...RequestOptionFunc) (*GroupLabel, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/labels", pathEscape(group))

	req, err := s.client.NewRequest(http.MethodPut, u, opt, options)
	if err != nil {
		return nil, nil, err
	}

	l := new(GroupLabel)
	resp, err := s.client.Do(req, l)
	if err != nil {
		return nil, resp, err
	}

	return l, resp, err
}

// SubscribeToGroupLabel subscribes the authenticated user to a label to receive
// notifications. If the user is already subscribed to the label, the status
// code 304 is returned.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#subscribe-to-a-group-label
func (s *GroupLabelsService) SubscribeToGroupLabel(gid interface{}, labelID interface{}, options ...RequestOptionFunc) (*GroupLabel, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	label, err := parseID(labelID)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/labels/%s/subscribe", pathEscape(group), label)

	req, err := s.client.NewRequest(http.MethodPost, u, nil, options)
	if err != nil {
		return nil, nil, err
	}

	l := new(GroupLabel)
	resp, err := s.client.Do(req, l)
	if err != nil {
		return nil, resp, err
	}

	return l, resp, err
}

// UnsubscribeFromGroupLabel unsubscribes the authenticated user from a label to not
// receive notifications from it. If the user is not subscribed to the label, the
// status code 304 is returned.
//
// GitLab API docs:
// https://docs.gitlab.com/ce/api/group_labels.html#unsubscribe-from-a-group-label
func (s *GroupLabelsService) UnsubscribeFromGroupLabel(gid interface{}, labelID interface{}, options ...RequestOptionFunc) (*Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, err
	}
	label, err := parseID(labelID)
	if err != nil {
		return nil, err
	}
	u := fmt.Sprintf("groups/%s/labels/%s/unsubscribe", pathEscape(group), label)

	req, err := s.client.NewRequest(http.MethodPost, u, nil, options)
	if err != nil {
		return nil, err
	}

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