import type { IExecuteFunctions } from 'n8n-core';

import type {
	IDataObject,
	INodeExecutionData,
	INodeType,
	INodeTypeDescription,
} from 'n8n-workflow';
import { NodeOperationError } from 'n8n-workflow';

import { gitlabApiRequest, gitlabApiRequestAllItems } from './GenericFunctions';

export class Gitlab implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'GitLab',
		name: 'gitlab',
		icon: 'file:gitlab.svg',
		group: ['input'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Retrieve data from GitLab API',
		defaults: {
			name: 'GitLab',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'gitlabApi',
				required: true,
				displayOptions: {
					show: {
						authentication: ['accessToken'],
					},
				},
			},
			{
				name: 'gitlabOAuth2Api',
				required: true,
				displayOptions: {
					show: {
						authentication: ['oAuth2'],
					},
				},
			},
		],
		properties: [
			{
				displayName: 'Authentication',
				name: 'authentication',
				type: 'options',
				options: [
					{
						name: 'Access Token',
						value: 'accessToken',
					},
					{
						name: 'OAuth2',
						value: 'oAuth2',
					},
				],
				default: 'accessToken',
			},
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				noDataExpression: true,
				options: [
					{
						name: 'File',
						value: 'file',
					},
					{
						name: 'Issue',
						value: 'issue',
					},
					{
						name: 'Release',
						value: 'release',
					},
					{
						name: 'Repository',
						value: 'repository',
					},
					{
						name: 'User',
						value: 'user',
					},
				],
				default: 'issue',
			},

			// ----------------------------------
			//         operations
			// ----------------------------------
			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				noDataExpression: true,
				displayOptions: {
					show: {
						resource: ['issue'],
					},
				},
				options: [
					{
						name: 'Create',
						value: 'create',
						description: 'Create a new issue',
						action: 'Create an issue',
					},
					{
						name: 'Create Comment',
						value: 'createComment',
						description: 'Create a new comment on an issue',
						action: 'Create a comment on an issue',
					},
					{
						name: 'Edit',
						value: 'edit',
						description: 'Edit an issue',
						action: 'Edit an issue',
					},
					{
						name: 'Get',
						value: 'get',
						description: 'Get the data of a single issue',
						action: 'Get an issue',
					},
					{
						name: 'Lock',
						value: 'lock',
						description: 'Lock an issue',
						action: 'Lock an issue',
					},
				],
				default: 'create',
			},

			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				noDataExpression: true,
				displayOptions: {
					show: {
						resource: ['repository'],
					},
				},
				options: [
					{
						name: 'Get',
						value: 'get',
						description: 'Get the data of a single repository',
						action: 'Get a repository',
					},
					{
						name: 'Get Issues',
						value: 'getIssues',
						description: 'Returns issues of a repository',
						action: 'Get issues of a repository',
					},
				],
				default: 'getIssues',
			},

			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				noDataExpression: true,
				displayOptions: {
					show: {
						resource: ['user'],
					},
				},
				options: [
					{
						name: 'Get Repositories',
						value: 'getRepositories',
						description: 'Returns the repositories of a user',
						action: "Get a user's repositories",
					},
				],
				default: 'getRepositories',
			},

			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				noDataExpression: true,
				displayOptions: {
					show: {
						resource: ['release'],
					},
				},
				options: [
					{
						name: 'Create',
						value: 'create',
						description: 'Create a new release',
						action: 'Create a release',
					},
					{
						name: 'Delete',
						value: 'delete',
						description: 'Delete a release',
						action: 'Delete a release',
					},
					{
						name: 'Get',
						value: 'get',
						description: 'Get a release',
						action: 'Get a release',
					},
					{
						name: 'Get Many',
						value: 'getAll',
						description: 'Get many releases',
						action: 'Get many releases',
					},
					{
						name: 'Update',
						value: 'update',
						description: 'Update a release',
						action: 'Update a release',
					},
				],
				default: 'create',
			},

			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				noDataExpression: true,
				displayOptions: {
					show: {
						resource: ['file'],
					},
				},
				options: [
					{
						name: 'Create',
						value: 'create',
						description: 'Create a new file in repository',
						action: 'Create a file',
					},
					{
						name: 'Delete',
						value: 'delete',
						description: 'Delete a file in repository',
						action: 'Delete a file',
					},
					{
						name: 'Edit',
						value: 'edit',
						description: 'Edit a file in repository',
						action: 'Edit a file',
					},
					{
						name: 'Get',
						value: 'get',
						description: 'Get the data of a single file',
						action: 'Get a file',
					},
					{
						name: 'List',
						value: 'list',
						description: 'List contents of a folder',
						action: 'List files',
					},
				],
				default: 'create',
			},

			// ----------------------------------
			//         shared
			// ----------------------------------
			{
				displayName: 'Project Owner',
				name: 'owner',
				type: 'string',
				default: '',
				required: true,
				placeholder: 'n8n-io',
				description: 'User, group or namespace of the project',
			},
			{
				displayName: 'Project Name',
				name: 'repository',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					hide: {
						resource: ['user'],
						operation: ['getRepositories'],
					},
				},
				placeholder: 'n8n',
				description: 'The name of the project',
			},

			// ----------------------------------
			//         issue
			// ----------------------------------

			// ----------------------------------
			//         issue:create
			// ----------------------------------
			{
				displayName: 'Title',
				name: 'title',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['issue'],
					},
				},
				description: 'The title of the issue',
			},
			{
				displayName: 'Body',
				name: 'body',
				type: 'string',
				typeOptions: {
					rows: 5,
				},
				default: '',
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['issue'],
					},
				},
				description: 'The body of the issue',
			},
			{
				displayName: 'Due Date',
				name: 'due_date',
				type: 'dateTime',
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['issue'],
					},
				},
				default: '',
				description: 'Due Date for issue',
			},
			{
				displayName: 'Labels',
				name: 'labels',
				type: 'collection',
				typeOptions: {
					multipleValues: true,
					multipleValueButtonText: 'Add Label',
				},
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['issue'],
					},
				},
				default: { label: '' },
				options: [
					{
						displayName: 'Label',
						name: 'label',
						type: 'string',
						default: '',
						description: 'Label to add to issue',
					},
				],
			},
			{
				displayName: 'Assignees',
				name: 'assignee_ids',
				type: 'collection',
				typeOptions: {
					multipleValues: true,
					multipleValueButtonText: 'Add Assignee',
				},
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['issue'],
					},
				},
				default: { assignee: '' },
				options: [
					{
						displayName: 'Assignee',
						name: 'assignee',
						type: 'number',
						default: 0,
						description: 'User ID to assign issue to',
					},
				],
			},

			// ----------------------------------
			//         issue:createComment
			// ----------------------------------
			{
				displayName: 'Issue Number',
				name: 'issueNumber',
				type: 'number',
				default: 0,
				required: true,
				displayOptions: {
					show: {
						operation: ['createComment'],
						resource: ['issue'],
					},
				},
				description: 'The number of the issue on which to create the comment on',
			},
			{
				displayName: 'Body',
				name: 'body',
				type: 'string',
				typeOptions: {
					rows: 5,
				},
				displayOptions: {
					show: {
						operation: ['createComment'],
						resource: ['issue'],
					},
				},
				default: '',
				description: 'The body of the comment',
			},

			// ----------------------------------
			//         issue:edit
			// ----------------------------------
			{
				displayName: 'Issue Number',
				name: 'issueNumber',
				type: 'number',
				default: 0,
				required: true,
				displayOptions: {
					show: {
						operation: ['edit'],
						resource: ['issue'],
					},
				},
				description: 'The number of the issue edit',
			},
			{
				displayName: 'Edit Fields',
				name: 'editFields',
				type: 'collection',
				typeOptions: {
					multipleValueButtonText: 'Add Field',
				},
				displayOptions: {
					show: {
						operation: ['edit'],
						resource: ['issue'],
					},
				},
				default: {},
				options: [
					{
						displayName: 'Title',
						name: 'title',
						type: 'string',
						default: '',
						description: 'The title of the issue',
					},
					{
						displayName: 'Body',
						name: 'description',
						type: 'string',
						typeOptions: {
							rows: 5,
						},
						default: '',
						description: 'The body of the issue',
					},
					{
						displayName: 'State',
						name: 'state',
						type: 'options',
						options: [
							{
								name: 'Closed',
								value: 'closed',
								description: 'Set the state to "closed"',
							},
							{
								name: 'Open',
								value: 'open',
								description: 'Set the state to "open"',
							},
						],
						default: 'open',
						description: 'The state to set',
					},
					{
						displayName: 'Labels',
						name: 'labels',
						type: 'collection',
						typeOptions: {
							multipleValues: true,
							multipleValueButtonText: 'Add Label',
						},
						default: { label: '' },
						options: [
							{
								displayName: 'Label',
								name: 'label',
								type: 'string',
								default: '',
								description: 'Label to add to issue',
							},
						],
					},
					{
						displayName: 'Assignees',
						name: 'assignee_ids',
						type: 'collection',
						typeOptions: {
							multipleValues: true,
							multipleValueButtonText: 'Add Assignee',
						},
						default: { assignee: '' },
						options: [
							{
								displayName: 'Assignees',
								name: 'assignee',
								type: 'string',
								default: '',
								description: 'User to assign issue too',
							},
						],
					},
					{
						displayName: 'Due Date',
						name: 'due_date',
						type: 'dateTime',
						default: '',
						description: 'Due Date for issue',
					},
				],
			},

			// ----------------------------------
			//         issue:get
			// ----------------------------------
			{
				displayName: 'Issue Number',
				name: 'issueNumber',
				type: 'number',
				default: 0,
				required: true,
				displayOptions: {
					show: {
						operation: ['get'],
						resource: ['issue'],
					},
				},
				description: 'The number of the issue get data of',
			},

			// ----------------------------------
			//         issue:lock
			// ----------------------------------
			{
				displayName: 'Issue Number',
				name: 'issueNumber',
				type: 'number',
				default: 0,
				required: true,
				displayOptions: {
					show: {
						operation: ['lock'],
						resource: ['issue'],
					},
				},
				description: 'The number of the issue to lock',
			},
			{
				displayName: 'Lock Reason',
				name: 'lockReason',
				type: 'options',
				displayOptions: {
					show: {
						operation: ['lock'],
						resource: ['issue'],
					},
				},
				options: [
					{
						name: 'Off-Topic',
						value: 'off-topic',
						description: 'The issue is Off-Topic',
					},
					{
						name: 'Too Heated',
						value: 'too heated',
						description: 'The discussion is too heated',
					},
					{
						name: 'Resolved',
						value: 'resolved',
						description: 'The issue got resolved',
					},
					{
						name: 'Spam',
						value: 'spam',
						description: 'The issue is spam',
					},
				],
				default: 'resolved',
				description: 'The reason to lock the issue',
			},

			// ----------------------------------
			//         release
			// ----------------------------------

			// ----------------------------------
			//         release:create
			// ----------------------------------
			{
				displayName: 'Tag',
				name: 'releaseTag',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['release'],
					},
				},
				description: 'The tag of the release',
			},
			{
				displayName: 'Additional Fields',
				name: 'additionalFields',
				type: 'collection',
				typeOptions: {
					multipleValueButtonText: 'Add Field',
				},
				displayOptions: {
					show: {
						operation: ['create'],
						resource: ['release'],
					},
				},
				default: {},
				options: [
					{
						displayName: 'Name',
						name: 'name',
						type: 'string',
						default: '',
						description: 'The name of the release',
					},
					{
						displayName: 'Description',
						name: 'description',
						type: 'string',
						typeOptions: {
							rows: 5,
						},
						default: '',
						description: 'The description of the release',
					},
					{
						displayName: 'Ref',
						name: 'ref',
						type: 'string',
						default: '',
						description:
							'If Tag doesn’t exist, the release will be created from Ref. It can be a commit SHA, another tag name, or a branch name.',
					},
				],
			},

			// ----------------------------------
			//         release:get/delete
			// ----------------------------------
			{
				displayName: 'Project ID',
				name: 'projectId',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['delete', 'get'],
						resource: ['release'],
					},
				},
				description: 'The ID or URL-encoded path of the project',
			},
			{
				displayName: 'Tag Name',
				name: 'tag_name',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['delete', 'get'],
						resource: ['release'],
					},
				},
				description: 'The Git tag the release is associated with',
			},

			// ----------------------------------
			//         release:getAll
			// ----------------------------------
			{
				displayName: 'Project ID',
				name: 'projectId',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['getAll'],
						resource: ['release'],
					},
				},
				description: 'The ID or URL-encoded path of the project',
			},
			{
				displayName: 'Return All',
				name: 'returnAll',
				type: 'boolean',
				displayOptions: {
					show: {
						resource: ['release', 'file'],
						operation: ['getAll', 'list'],
					},
				},
				default: false,
				description: 'Whether to return all results or only up to a given limit',
			},
			{
				displayName: 'Limit',
				name: 'limit',
				type: 'number',
				displayOptions: {
					show: {
						resource: ['release', 'file'],
						operation: ['getAll', 'list'],
						returnAll: [false],
					},
				},
				typeOptions: {
					minValue: 1,
					maxValue: 100,
				},
				default: 20,
				description: 'Max number of results to return',
			},
			{
				displayName: 'Additional Fields',
				name: 'additionalFields',
				type: 'collection',
				typeOptions: {
					multipleValueButtonText: 'Add Field',
				},
				displayOptions: {
					show: {
						operation: ['getAll'],
						resource: ['release'],
					},
				},
				default: {},
				options: [
					{
						displayName: 'Order By',
						name: 'order_by',
						type: 'options',
						options: [
							{
								name: 'Created At',
								value: 'created_at',
							},
							{
								name: 'Released At',
								value: 'released_at',
							},
						],
						default: 'released_at',
						description: 'The field to use as order',
					},
					{
						displayName: 'Sort',
						name: 'sort',
						type: 'options',
						options: [
							{
								name: 'ASC',
								value: 'asc',
							},
							{
								name: 'DESC',
								value: 'desc',
							},
						],
						default: 'desc',
						description: 'The direction of the order. .',
					},
				],
			},

			// ----------------------------------
			//         release:update
			// ----------------------------------
			{
				displayName: 'Project ID',
				name: 'projectId',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['update'],
						resource: ['release'],
					},
				},
				description: 'The ID or URL-encoded path of the project',
			},
			{
				displayName: 'Tag Name',
				name: 'tag_name',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['update'],
						resource: ['release'],
					},
				},
				description: 'The Git tag the release is associated with',
			},
			{
				displayName: 'Additional Fields',
				name: 'additionalFields',
				type: 'collection',
				typeOptions: {
					multipleValueButtonText: 'Add Field',
				},
				displayOptions: {
					show: {
						operation: ['update'],
						resource: ['release'],
					},
				},
				default: {},
				options: [
					{
						displayName: 'Name',
						name: 'name',
						type: 'string',
						default: '',
						description: 'The release name',
					},
					{
						displayName: 'Description',
						name: 'description',
						type: 'string',
						default: '',
						description: 'The description of the release. You can use Markdown.',
					},
					{
						displayName: 'Milestones',
						name: 'milestones',
						type: 'string',
						default: '',
						description:
							'The title of each milestone to associate with the release (provide a titles list spearated with comma)',
					},
					{
						displayName: 'Released At',
						name: 'released_at',
						type: 'dateTime',
						default: '',
						description: 'The date when the release is/was ready',
					},
				],
			},
			// ----------------------------------
			//         repository
			// ----------------------------------

			// ----------------------------------
			//         repository:getIssues
			// ----------------------------------
			{
				displayName: 'Filters',
				name: 'getRepositoryIssuesFilters',
				type: 'collection',
				typeOptions: {
					multipleValueButtonText: 'Add Filter',
				},
				displayOptions: {
					show: {
						operation: ['getIssues'],
						resource: ['repository'],
					},
				},
				default: {},
				options: [
					{
						displayName: 'Assignee',
						name: 'assignee_username',
						type: 'string',
						default: '',
						description: 'Return only issues which are assigned to a specific user',
					},
					{
						displayName: 'Creator',
						name: 'author_username',
						type: 'string',
						default: '',
						description: 'Return only issues which were created by a specific user',
					},
					{
						displayName: 'Labels',
						name: 'labels',
						type: 'string',
						default: '',
						description:
							'Return only issues with the given labels. Multiple lables can be separated by comma.',
					},
					{
						displayName: 'Updated After',
						name: 'updated_after',
						type: 'dateTime',
						default: '',
						description: 'Return only issues updated at or after this time',
					},
					{
						displayName: 'State',
						name: 'state',
						type: 'options',
						options: [
							{
								name: 'All',
								value: '',
								description: 'Returns issues with any state',
							},
							{
								name: 'Closed',
								value: 'closed',
								description: 'Return issues with "closed" state',
							},
							{
								name: 'Open',
								value: 'opened',
								description: 'Return issues with "open" state',
							},
						],
						default: 'opened',
						description: 'The state to filter by',
					},
					{
						displayName: 'Sort',
						name: 'order_by',
						type: 'options',
						options: [
							{
								name: 'Created At',
								value: 'created_at',
								description: 'Sort by created date',
							},
							{
								name: 'Updated At',
								value: 'updated_at',
								description: 'Sort by updated date',
							},
							{
								name: 'Priority',
								value: 'priority',
								description: 'Sort by priority',
							},
						],
						default: 'created_at',
						description: 'The order the issues should be returned in',
					},
					{
						displayName: 'Direction',
						name: 'sort',
						type: 'options',
						options: [
							{
								name: 'Ascending',
								value: 'asc',
								description: 'Sort in ascending order',
							},
							{
								name: 'Descending',
								value: 'desc',
								description: 'Sort in descending order',
							},
						],
						default: 'desc',
						description: 'The sort order',
					},
				],
			},
			// ----------------------------------
			//         file
			// ----------------------------------

			// ----------------------------------
			//         file:create/delete/edit/get
			// ----------------------------------
			{
				displayName: 'File Path',
				name: 'filePath',
				type: 'string',
				default: '',
				displayOptions: {
					show: {
						resource: ['file'],
					},
					hide: {
						operation: ['list'],
					},
				},
				placeholder: 'docs/README.md',
				description:
					'The file path of the file. Has to contain the full path or leave it empty for root folder.',
			},

			// ----------------------------------
			//         file:list
			// ----------------------------------
			{
				displayName: 'Path',
				name: 'filePath',
				type: 'string',
				default: '',
				displayOptions: {
					show: {
						resource: ['file'],
						operation: ['list'],
					},
				},
				placeholder: 'docs/',
				description: 'The path of the folder to list',
			},

			{
				displayName: 'Page',
				name: 'page',
				type: 'number',
				displayOptions: {
					show: {
						resource: ['file'],
						operation: ['list'],
						returnAll: [false],
					},
				},
				typeOptions: {
					minValue: 1,
					maxValue: 1000,
				},
				default: 1,
				description: 'Page of results to display',
			},

			// ----------------------------------
			//         file:get
			// ----------------------------------
			{
				displayName: 'As Binary Property',
				name: 'asBinaryProperty',
				type: 'boolean',
				default: true,
				displayOptions: {
					show: {
						operation: ['get'],
						resource: ['file'],
					},
				},
				description:
					'Whether to set the data of the file as binary property instead of returning the raw API response',
			},
			{
				displayName: 'Binary Property',
				name: 'binaryPropertyName',
				type: 'string',
				default: 'data',
				required: true,
				displayOptions: {
					show: {
						asBinaryProperty: [true],
						operation: ['get'],
						resource: ['file'],
					},
				},
				placeholder: '',
				description:
					'Name of the binary property in which to save the binary data of the received file',
			},
			{
				displayName: 'Additional Parameters',
				name: 'additionalParameters',
				placeholder: 'Add Parameter',
				description: 'Additional fields to add',
				type: 'collection',
				default: {},
				displayOptions: {
					show: {
						operation: ['get'],
						resource: ['file'],
					},
				},
				options: [
					{
						displayName: 'Reference',
						name: 'reference',
						type: 'string',
						default: '',
						placeholder: 'master',
						description:
							'The name of the commit/branch/tag. Default: the repository’s default branch (usually master).',
					},
				],
			},

			// ----------------------------------
			//         file:create/edit
			// ----------------------------------
			{
				displayName: 'Binary Data',
				name: 'binaryData',
				type: 'boolean',
				default: false,
				required: true,
				displayOptions: {
					show: {
						operation: ['create', 'edit'],
						resource: ['file'],
					},
				},
				description: 'Whether the data to upload should be taken from binary field',
			},
			{
				displayName: 'File Content',
				name: 'fileContent',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						binaryData: [false],
						operation: ['create', 'edit'],
						resource: ['file'],
					},
				},
				placeholder: '',
				description: 'The text content of the file',
			},
			{
				displayName: 'Binary Property',
				name: 'binaryPropertyName',
				type: 'string',
				default: 'data',
				required: true,
				displayOptions: {
					show: {
						binaryData: [true],
						operation: ['create', 'edit'],
						resource: ['file'],
					},
				},
				placeholder: '',
				description: 'Name of the binary property which contains the data for the file',
			},
			{
				displayName: 'Commit Message',
				name: 'commitMessage',
				type: 'string',
				default: '',
				required: true,
				displayOptions: {
					show: {
						operation: ['create', 'delete', 'edit'],
						resource: ['file'],
					},
				},
			},
			{
				displayName: 'Branch',
				name: 'branch',
				type: 'string',
				default: '',
				description: 'Name of the new branch to create. The commit is added to this branch.',
				required: true,
				displayOptions: {
					show: {
						operation: ['create', 'delete', 'edit'],
						resource: ['file'],
					},
				},
			},
			{
				displayName: 'Additional Parameters',
				name: 'additionalParameters',
				placeholder: 'Add Parameter',
				description: 'Additional fields to add',
				type: 'fixedCollection',
				default: {},
				displayOptions: {
					show: {
						operation: ['create', 'delete', 'edit'],
						resource: ['file'],
					},
				},
				options: [
					{
						displayName: 'Start Branch',
						name: 'branchStart',
						values: [
							{
								displayName: 'Start Branch',
								name: 'branchStart',
								type: 'string',
								default: '',
								description: 'Name of the base branch to create the new branch from',
							},
						],
					},
					{
						name: 'author',
						displayName: 'Author',
						values: [
							{
								displayName: 'Name',
								name: 'name',
								type: 'string',
								default: '',
								description: 'The name of the author of the commit',
							},
							{
								displayName: 'Email',
								name: 'email',
								type: 'string',
								placeholder: 'name@email.com',
								default: '',
								description: 'The email of the author of the commit',
							},
						],
					},
					{
						name: 'encoding',
						displayName: 'Encoding',
						values: [
							{
								displayName: 'Encoding',
								name: 'encoding',
								type: 'string',
								default: 'text',
								description: 'Change encoding to base64. Default is text.',
							},
						],
					},
				],
			},
		],
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: INodeExecutionData[] = [];

		let _credentials;

		const authenticationMethod = this.getNodeParameter('authentication', 0);

		try {
			if (authenticationMethod === 'accessToken') {
				_credentials = await this.getCredentials('gitlabApi');
			} else {
				_credentials = await this.getCredentials('gitlabOAuth2Api');
			}
		} catch (error) {
			if (this.continueOnFail()) {
				return [this.helpers.returnJsonArray([{ error: error.message }])];
			}
			throw new NodeOperationError(this.getNode(), error);
		}

		// Operations which overwrite the returned data
		const overwriteDataOperations = [
			'file:get',
			'file:create',
			'file:edit',
			'file:delete',
			'issue:create',
			'issue:createComment',
			'issue:edit',
			'issue:get',
			'release:create',
			'release:delete',
			'release:get',
			'release:update',
			'repository:get',
		];
		// Operations which overwrite the returned data and return arrays
		// and has so to be merged with the data of other items
		const overwriteDataOperationsArray = [
			'file:list',
			'release:getAll',
			'repository:getIssues',
			'user:getRepositories',
		];

		let responseData;
		// For Post
		let body: IDataObject;
		// For Query string
		let qs: IDataObject;

		let requestMethod: string;
		let endpoint: string;
		let returnAll = false;

		const operation = this.getNodeParameter('operation', 0);
		const resource = this.getNodeParameter('resource', 0);
		const fullOperation = `${resource}:${operation}`;

		for (let i = 0; i < items.length; i++) {
			try {
				// Reset all values
				requestMethod = 'GET';
				endpoint = '';
				body = {};
				qs = {};

				// Request the parameters which almost all operations need
				let owner = this.getNodeParameter('owner', i) as string;

				// Replace all slashes to work with subgroups
				owner = owner.replace(new RegExp(/\//g), '%2F');

				let repository = '';
				if (fullOperation !== 'user:getRepositories') {
					repository = this.getNodeParameter('repository', i) as string;
				}

				const baseEndpoint = `/projects/${owner}%2F${repository}`;

				if (resource === 'issue') {
					if (operation === 'create') {
						// ----------------------------------
						//         create
						// ----------------------------------

						requestMethod = 'POST';

						body.title = this.getNodeParameter('title', i) as string;
						body.description = this.getNodeParameter('body', i) as string;
						body.due_date = this.getNodeParameter('due_date', i) as string;
						const labels = this.getNodeParameter('labels', i) as IDataObject[];

						const assigneeIds = this.getNodeParameter('assignee_ids', i) as IDataObject[];

						body.labels = labels.map((data) => data.label).join(',');
						body.assignee_ids = assigneeIds.map((data) => data.assignee);

						endpoint = `${baseEndpoint}/issues`;
					} else if (operation === 'createComment') {
						// ----------------------------------
						//         createComment
						// ----------------------------------
						requestMethod = 'POST';

						const issueNumber = this.getNodeParameter('issueNumber', i) as string;

						body.body = this.getNodeParameter('body', i) as string;

						endpoint = `${baseEndpoint}/issues/${issueNumber}/notes`;
					} else if (operation === 'edit') {
						// ----------------------------------
						//         edit
						// ----------------------------------

						requestMethod = 'PUT';

						const issueNumber = this.getNodeParameter('issueNumber', i) as string;

						body = this.getNodeParameter('editFields', i, {}) as IDataObject;

						if (body.labels !== undefined) {
							body.labels = (body.labels as IDataObject[]).map((data) => data.label).join(',');
						}
						if (body.assignee_ids !== undefined) {
							body.assignee_ids = (body.assignee_ids as IDataObject[]).map((data) => data.assignee);
						}

						endpoint = `${baseEndpoint}/issues/${issueNumber}`;
					} else if (operation === 'get') {
						// ----------------------------------
						//         get
						// ----------------------------------

						requestMethod = 'GET';

						const issueNumber = this.getNodeParameter('issueNumber', i) as string;

						endpoint = `${baseEndpoint}/issues/${issueNumber}`;
					} else if (operation === 'lock') {
						// ----------------------------------
						//         lock
						// ----------------------------------

						requestMethod = 'PUT';

						const issueNumber = this.getNodeParameter('issueNumber', i) as string;

						body.discussion_locked = true;

						endpoint = `${baseEndpoint}/issues/${issueNumber}`;
					}
				} else if (resource === 'release') {
					if (operation === 'create') {
						// ----------------------------------
						//         create
						// ----------------------------------

						requestMethod = 'POST';

						body = this.getNodeParameter('additionalFields', i, {});

						body.tag_name = this.getNodeParameter('releaseTag', i) as string;

						endpoint = `${baseEndpoint}/releases`;
					}
					if (operation === 'delete') {
						// ----------------------------------
						//         delete
						// ----------------------------------

						requestMethod = 'DELETE';

						const id = this.getNodeParameter('projectId', i) as string;

						const tagName = this.getNodeParameter('tag_name', i) as string;

						endpoint = `/projects/${id}/releases/${tagName}`;
					}
					if (operation === 'get') {
						// ----------------------------------
						//         get
						// ----------------------------------

						requestMethod = 'GET';

						const id = this.getNodeParameter('projectId', i) as string;

						const tagName = this.getNodeParameter('tag_name', i) as string;

						endpoint = `/projects/${id}/releases/${tagName}`;
					}
					if (operation === 'getAll') {
						// ----------------------------------
						//         getAll
						// ----------------------------------

						requestMethod = 'GET';

						const id = this.getNodeParameter('projectId', i) as string;

						qs = this.getNodeParameter('additionalFields', i, {});

						returnAll = this.getNodeParameter('returnAll', 0);

						if (!returnAll) {
							qs.per_page = this.getNodeParameter('limit', 0);
						}

						endpoint = `/projects/${id}/releases`;
					}
					if (operation === 'update') {
						// ----------------------------------
						//         update
						// ----------------------------------

						requestMethod = 'PUT';

						const id = this.getNodeParameter('projectId', i) as string;

						const tagName = this.getNodeParameter('tag_name', i) as string;

						body = this.getNodeParameter('additionalFields', i, {});
						if (body.milestones) {
							body.milestones = (body.milestones as string).split(',');
						}

						endpoint = `/projects/${id}/releases/${tagName}`;
					}
				} else if (resource === 'repository') {
					if (operation === 'get') {
						// ----------------------------------
						//         get
						// ----------------------------------

						requestMethod = 'GET';

						endpoint = `${baseEndpoint}`;
					} else if (operation === 'getIssues') {
						// ----------------------------------
						//         getIssues
						// ----------------------------------

						requestMethod = 'GET';

						qs = this.getNodeParameter('getRepositoryIssuesFilters', i) as IDataObject;

						endpoint = `${baseEndpoint}/issues`;
					}
				} else if (resource === 'user') {
					if (operation === 'getRepositories') {
						// ----------------------------------
						//         getRepositories
						// ----------------------------------

						requestMethod = 'GET';

						endpoint = `/users/${owner}/projects`;
					}
				} else if (resource === 'file') {
					if (['create', 'edit'].includes(operation)) {
						// ----------------------------------
						//         create
						// ----------------------------------

						requestMethod = operation === 'create' ? 'POST' : 'PUT';

						const filePath = this.getNodeParameter('filePath', i);
						const additionalParameters = this.getNodeParameter(
							'additionalParameters',
							i,
						) as IDataObject;

						body.branch = this.getNodeParameter('branch', i) as string;
						body.commit_message = this.getNodeParameter('commitMessage', i) as string;

						if (additionalParameters.author) {
							body.author = additionalParameters.author;
						}
						if (
							additionalParameters.branchStart &&
							(additionalParameters.branchStart as IDataObject).branchStart
						) {
							body.start_branch = (additionalParameters.branchStart as IDataObject).branchStart;
						}

						if (this.getNodeParameter('binaryData', i)) {
							// Is binary file to upload
							const item = items[i];

							if (item.binary === undefined) {
								throw new NodeOperationError(this.getNode(), 'No binary data exists on item!', {
									itemIndex: i,
								});
							}

							const binaryPropertyName = this.getNodeParameter('binaryPropertyName', i);

							if (item.binary[binaryPropertyName] === undefined) {
								throw new NodeOperationError(
									this.getNode(),
									`No binary data property "${binaryPropertyName}" does not exists on item!`,
									{ itemIndex: i },
								);
							}

							// Currently internally n8n uses base64 and also GitLab expects it base64 encoded.
							// If that ever changes the data has to get converted here.
							body.content = item.binary[binaryPropertyName].data;
							body.encoding = 'base64';
						} else {
							// Is text file
							if (additionalParameters.encoding === 'base64') {
								body.content = Buffer.from(
									this.getNodeParameter('fileContent', i) as string,
								).toString('base64');
							} else {
								body.content = this.getNodeParameter('fileContent', i) as string;
							}
						}

						endpoint = `${baseEndpoint}/repository/files/${encodeURIComponent(filePath)}`;
					} else if (operation === 'delete') {
						// ----------------------------------
						//         delete
						// ----------------------------------

						requestMethod = 'DELETE';

						const additionalParameters = this.getNodeParameter(
							'additionalParameters',
							i,
							{},
						) as IDataObject;
						if (additionalParameters.author) {
							body.author = additionalParameters.author;
						}
						body.branch = this.getNodeParameter('branch', i) as string;
						body.commit_message = this.getNodeParameter('commitMessage', i) as string;

						const filePath = this.getNodeParameter('filePath', i);

						endpoint = `${baseEndpoint}/repository/files/${encodeURIComponent(filePath)}`;
					} else if (operation === 'get') {
						// ----------------------------------
						//         get
						// ----------------------------------

						requestMethod = 'GET';

						const filePath = this.getNodeParameter('filePath', i);
						const additionalParameters = this.getNodeParameter(
							'additionalParameters',
							i,
						) as IDataObject;

						if (additionalParameters.reference) {
							qs.ref = additionalParameters.reference;
						} else {
							qs.ref = 'master';
						}

						endpoint = `${baseEndpoint}/repository/files/${encodeURIComponent(filePath)}`;
					} else if (operation === 'list') {
						requestMethod = 'GET';

						const filePath = this.getNodeParameter('filePath', i);
						qs = this.getNodeParameter('additionalFields', i, {});
						returnAll = this.getNodeParameter('returnAll', i);

						if (!returnAll) {
							qs.per_page = this.getNodeParameter('limit', i);
							qs.page = this.getNodeParameter('page', i);
						}

						if (filePath) {
							qs.path = filePath;
						}
						endpoint = `${baseEndpoint}/repository/tree`;
					}
				} else {
					throw new NodeOperationError(this.getNode(), `The resource "${resource}" is not known!`, {
						itemIndex: i,
					});
				}

				const asBinaryProperty = this.getNodeParameter('asBinaryProperty', i, false) as boolean;
				if (returnAll) {
					responseData = await gitlabApiRequestAllItems.call(
						this,
						requestMethod,
						endpoint,
						body,
						qs,
					);
				} else {
					responseData = await gitlabApiRequest.call(this, requestMethod, endpoint, body, qs);
				}

				if (fullOperation === 'file:get' && asBinaryProperty) {
					if (Array.isArray(responseData) && responseData.length > 1) {
						throw new NodeOperationError(this.getNode(), 'File Path is a folder, not a file.', {
							itemIndex: i,
						});
					}
					// Add the returned data to the item as binary property
					const binaryPropertyName = this.getNodeParameter('binaryPropertyName', i);

					const newItem: INodeExecutionData = {
						json: items[i].json,
						binary: {},
					};

					if (items[i].binary !== undefined) {
						// Create a shallow copy of the binary data so that the old
						// data references which do not get changed still stay behind
						// but the incoming data does not get changed.
						Object.assign(newItem.binary as object, items[i].binary!);
					}
					const { content, path } = responseData;
					newItem.binary![binaryPropertyName] = await this.helpers.prepareBinaryData(
						Buffer.from(content as string, 'base64'),
						path as string,
					);

					items[i] = newItem;

					return [items];
				}

				if (
					overwriteDataOperations.includes(fullOperation) ||
					overwriteDataOperationsArray.includes(fullOperation)
				) {
					const executionData = this.helpers.constructExecutionMetaData(
						this.helpers.returnJsonArray(responseData),
						{ itemData: { item: i } },
					);
					returnData.push(...executionData);
				}
			} catch (error) {
				if (this.continueOnFail()) {
					if (
						overwriteDataOperations.includes(fullOperation) ||
						overwriteDataOperationsArray.includes(fullOperation)
					) {
						const executionErrorData = this.helpers.constructExecutionMetaData(
							this.helpers.returnJsonArray({ error: error.message }),
							{ itemData: { item: i } },
						);
						returnData.push(...executionErrorData);
					} else {
						items[i].json = { error: error.message };
					}
					continue;
				}
				throw error;
			}
		}

		if (
			overwriteDataOperations.includes(fullOperation) ||
			overwriteDataOperationsArray.includes(fullOperation)
		) {
			// Return data gets replaced
			return this.prepareOutputData(returnData);
		} else {
			// For all other ones simply return the unchanged items
			return this.prepareOutputData(items);
		}
	}
}