//
// 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"
	"time"
)

// AccessRequest represents a access request for a group or project.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html
type AccessRequest struct {
	ID          int              `json:"id"`
	Username    string           `json:"username"`
	Name        string           `json:"name"`
	State       string           `json:"state"`
	CreatedAt   *time.Time       `json:"created_at"`
	RequestedAt *time.Time       `json:"requested_at"`
	AccessLevel AccessLevelValue `json:"access_level"`
}

// AccessRequestsService handles communication with the project/group
// access requests related methods of the GitLab API.
//
// GitLab API docs: https://docs.gitlab.com/ee/api/access_requests.html
type AccessRequestsService struct {
	client *Client
}

// ListAccessRequestsOptions represents the available
// ListProjectAccessRequests() or ListGroupAccessRequests() options.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#list-access-requests-for-a-group-or-project
type ListAccessRequestsOptions ListOptions

// ListProjectAccessRequests gets a list of access requests
// viewable by the authenticated user.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#list-access-requests-for-a-group-or-project
func (s *AccessRequestsService) ListProjectAccessRequests(pid interface{}, opt *ListAccessRequestsOptions, options ...RequestOptionFunc) ([]*AccessRequest, *Response, error) {
	project, err := parseID(pid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("projects/%s/access_requests", PathEscape(project))

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

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

	return ars, resp, err
}

// ListGroupAccessRequests gets a list of access requests
// viewable by the authenticated user.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#list-access-requests-for-a-group-or-project
func (s *AccessRequestsService) ListGroupAccessRequests(gid interface{}, opt *ListAccessRequestsOptions, options ...RequestOptionFunc) ([]*AccessRequest, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/access_requests", PathEscape(group))

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

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

	return ars, resp, err
}

// RequestProjectAccess requests access for the authenticated user
// to a group or project.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#request-access-to-a-group-or-project
func (s *AccessRequestsService) RequestProjectAccess(pid interface{}, options ...RequestOptionFunc) (*AccessRequest, *Response, error) {
	project, err := parseID(pid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("projects/%s/access_requests", PathEscape(project))

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

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

	return ar, resp, err
}

// RequestGroupAccess requests access for the authenticated user
// to a group or project.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#request-access-to-a-group-or-project
func (s *AccessRequestsService) RequestGroupAccess(gid interface{}, options ...RequestOptionFunc) (*AccessRequest, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/access_requests", PathEscape(group))

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

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

	return ar, resp, err
}

// ApproveAccessRequestOptions represents the available
// ApproveProjectAccessRequest() and ApproveGroupAccessRequest() options.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#approve-an-access-request
type ApproveAccessRequestOptions struct {
	AccessLevel *AccessLevelValue `url:"access_level,omitempty" json:"access_level,omitempty"`
}

// ApproveProjectAccessRequest approves an access request for the given user.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#approve-an-access-request
func (s *AccessRequestsService) ApproveProjectAccessRequest(pid interface{}, user int, opt *ApproveAccessRequestOptions, options ...RequestOptionFunc) (*AccessRequest, *Response, error) {
	project, err := parseID(pid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("projects/%s/access_requests/%d/approve", PathEscape(project), user)

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

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

	return ar, resp, err
}

// ApproveGroupAccessRequest approves an access request for the given user.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#approve-an-access-request
func (s *AccessRequestsService) ApproveGroupAccessRequest(gid interface{}, user int, opt *ApproveAccessRequestOptions, options ...RequestOptionFunc) (*AccessRequest, *Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, nil, err
	}
	u := fmt.Sprintf("groups/%s/access_requests/%d/approve", PathEscape(group), user)

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

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

	return ar, resp, err
}

// DenyProjectAccessRequest denies an access request for the given user.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#deny-an-access-request
func (s *AccessRequestsService) DenyProjectAccessRequest(pid interface{}, user int, options ...RequestOptionFunc) (*Response, error) {
	project, err := parseID(pid)
	if err != nil {
		return nil, err
	}
	u := fmt.Sprintf("projects/%s/access_requests/%d", PathEscape(project), user)

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

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

// DenyGroupAccessRequest denies an access request for the given user.
//
// GitLab API docs:
// https://docs.gitlab.com/ee/api/access_requests.html#deny-an-access-request
func (s *AccessRequestsService) DenyGroupAccessRequest(gid interface{}, user int, options ...RequestOptionFunc) (*Response, error) {
	group, err := parseID(gid)
	if err != nil {
		return nil, err
	}
	u := fmt.Sprintf("groups/%s/access_requests/%d", PathEscape(group), user)

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

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