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

import {
	ICredentialsDecrypted,
	ICredentialTestFunctions,
	IDataObject,
	ILoadOptionsFunctions,
	INodeExecutionData,
	INodePropertyOptions,
	INodeType,
	INodeTypeDescription,
	NodeCredentialTestResult,
	NodeOperationError,
} from 'n8n-workflow';

import {
	elasticSecurityApiRequest,
	getConnector,
	getVersion,
	handleListing,
	throwOnEmptyUpdate,
	tolerateTrailingSlash,
} from './GenericFunctions';

import {
	caseCommentFields,
	caseCommentOperations,
	caseFields,
	caseOperations,
	caseTagFields,
	caseTagOperations,
	connectorFields,
	connectorOperations,
} from './descriptions';

import {
	Connector,
	ConnectorCreatePayload,
	ConnectorType,
	ElasticSecurityApiCredentials,
} from './types';

import {
	OptionsWithUri,
} from 'request';

export class ElasticSecurity implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Elastic Security',
		name: 'elasticSecurity',
		icon: 'file:elasticSecurity.svg',
		group: ['transform'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Consume the Elastic Security API',
		defaults: {
			name: 'Elastic Security',
			color: '#f3d337',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'elasticSecurityApi',
				required: true,
				testedBy: 'elasticSecurityApiTest',
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				noDataExpression: true,
				type: 'options',
				options: [
					{
						name: 'Case',
						value: 'case',
					},
					{
						name: 'Case Comment',
						value: 'caseComment',
					},
					{
						name: 'Case Tag',
						value: 'caseTag',
					},
					{
						name: 'Connector',
						value: 'connector',
					},
				],
				default: 'case',
			},
			...caseOperations,
			...caseFields,
			...caseCommentOperations,
			...caseCommentFields,
			...caseTagOperations,
			...caseTagFields,
			...connectorOperations,
			...connectorFields,
		],
	};

	methods = {
		loadOptions: {
			async getTags(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const tags = await elasticSecurityApiRequest.call(this, 'GET', '/cases/tags') as string[];
				return tags.map(tag => ({ name: tag, value: tag }));
			},

			async getConnectors(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const endpoint = '/cases/configure/connectors/_find';
				const connectors = await elasticSecurityApiRequest.call(this, 'GET', endpoint) as Connector[];
				return connectors.map(({ name, id }) => ({ name, value: id }));
			},
		},
		credentialTest: {
			async elasticSecurityApiTest(
				this: ICredentialTestFunctions,
				credential: ICredentialsDecrypted,
			): Promise<NodeCredentialTestResult> {
				const {
					username,
					password,
					baseUrl: rawBaseUrl,
				} = credential.data as ElasticSecurityApiCredentials;

				const baseUrl = tolerateTrailingSlash(rawBaseUrl);

				const token = Buffer.from(`${username}:${password}`).toString('base64');

				const endpoint = '/cases/status';

				const options: OptionsWithUri = {
					headers: {
						Authorization: `Basic ${token}`,
						'kbn-xsrf': true,
					},
					method: 'GET',
					body: {},
					qs: {},
					uri: `${baseUrl}/api${endpoint}`,
					json: true,
				};

				try {
					await this.helpers.request(options);
					return {
						status: 'OK',
						message: 'Authentication successful',
					};
				} catch (error) {
					return {
						status: 'Error',
						message: error.message,
					};
				}
			},
		},
	};

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

		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;

		let responseData;

		for (let i = 0; i < items.length; i++) {

			try {

				if (resource === 'case') {

					// **********************************************************************
					//                                  case
					// **********************************************************************

					if (operation === 'create') {

						// ----------------------------------------
						//               case: create
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-create.html

						const body = {
							title: this.getNodeParameter('title', i),
							connector: {},
							owner: 'securitySolution',
							description: '',
							tags: [], // set via `caseTag: add` but must be present
							settings: {
								syncAlerts: this.getNodeParameter('additionalFields.syncAlerts', i, false),
							},
						} as IDataObject;

						const connectorId = this.getNodeParameter('connectorId', i) as ConnectorType;

						const {
							id: fetchedId,
							name: fetchedName,
							type: fetchedType,
						} = await getConnector.call(this, connectorId);

						const selectedConnectorType = this.getNodeParameter('connectorType', i) as ConnectorType;

						if (fetchedType !== selectedConnectorType) {
							throw new NodeOperationError(
								this.getNode(),
								'Connector Type does not match the type of the connector in Connector Name',
							);
						}

						const connector = {
							id: fetchedId,
							name: fetchedName,
							type: fetchedType,
							fields: {},
						};

						if (selectedConnectorType === '.jira') {
							connector.fields = {
								issueType: this.getNodeParameter('issueType', i),
								priority: this.getNodeParameter('priority', i),
								parent: null, // required but unimplemented
							};
						} else if (selectedConnectorType === '.servicenow') {
							connector.fields = {
								urgency: this.getNodeParameter('urgency', i),
								severity: this.getNodeParameter('severity', i),
								impact: this.getNodeParameter('impact', i),
								category: this.getNodeParameter('category', i),
								subcategory: null, // required but unimplemented
							};
						} else if (selectedConnectorType === '.resilient') {
							const rawIssueTypes = this.getNodeParameter('issueTypes', i) as string;
							connector.fields = {
								issueTypes: rawIssueTypes.split(',').map(Number),
								severityCode: this.getNodeParameter('severityCode', i) as number,
								incidentTypes: null, // required but undocumented
							};
						}

						body.connector = connector;

						const {
							syncAlerts, // ignored because already set
							...rest
						} = this.getNodeParameter('additionalFields', i) as IDataObject;

						if (Object.keys(rest).length) {
							Object.assign(body, rest);
						}

						responseData = await elasticSecurityApiRequest.call(this, 'POST', '/cases', body);

					} else if (operation === 'delete') {

						// ----------------------------------------
						//               case: delete
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-delete-case.html

						const caseId = this.getNodeParameter('caseId', i);
						await elasticSecurityApiRequest.call(this, 'DELETE', `/cases?ids=["${caseId}"]`);
						responseData = { success: true };

					} else if (operation === 'get') {

						// ----------------------------------------
						//                case: get
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-get-case.html

						const caseId = this.getNodeParameter('caseId', i);
						responseData = await elasticSecurityApiRequest.call(this, 'GET', `/cases/${caseId}`);

					} else if (operation === 'getAll') {

						// ----------------------------------------
						//               case: getAll
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-find-cases.html

						const qs = {} as IDataObject;
						const {
							tags,
							status,
						} = this.getNodeParameter('filters', i) as IDataObject & { tags: string[], status: string };
						const sortOptions = this.getNodeParameter('sortOptions', i) as IDataObject;

						qs.sortField = sortOptions.sortField ?? 'createdAt';
						qs.sortOrder = sortOptions.sortOrder ?? 'asc';

						if (status) {
							qs.status = status;
						}

						if (tags?.length) {
							qs.tags = tags.join(',');
						}

						responseData = await handleListing.call(this, 'GET', '/cases/_find', {}, qs);

					} else if (operation === 'getStatus') {

						// ----------------------------------------
						//             case: getStatus
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-get-status.html

						responseData = await elasticSecurityApiRequest.call(this, 'GET', '/cases/status');

					} else if (operation === 'update') {

						// ----------------------------------------
						//               case: update
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-update.html

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

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

						if (!Object.keys(updateFields).length) {
							throwOnEmptyUpdate.call(this, resource);
						}

						const { syncAlerts, ...rest } = updateFields;

						Object.assign(body, {
							cases: [
								{
									id: caseId,
									version: await getVersion.call(this, `/cases/${caseId}`),
									...(syncAlerts && { settings: { syncAlerts } }),
									...rest,
								},
							],
						});

						responseData = await elasticSecurityApiRequest.call(this, 'PATCH', '/cases', body);

					}

				} else if (resource === 'caseTag') {

					// **********************************************************************
					//                               caseTag
					// **********************************************************************

					if (operation === 'add') {

						// ----------------------------------------
						//              caseTag: add
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-create.html

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

						const {
							title,
							connector,
							owner,
							description,
							settings,
							tags,
						} = await elasticSecurityApiRequest.call(this, 'GET', `/cases/${caseId}`);

						const tagToAdd = this.getNodeParameter('tag', i);

						if (tags.includes(tagToAdd)) {
							throw new NodeOperationError(
								this.getNode(),
								`Cannot add tag "${tagToAdd}" to case ID ${caseId} because this case already has this tag.`,
							);
						}

						const body = {};

						Object.assign(body, {
							cases: [
								{
									id: caseId,
									title,
									connector,
									owner,
									description,
									settings,
									version: await getVersion.call(this, `/cases/${caseId}`),
									tags: [...tags, tagToAdd],
								},
							],
						});

						responseData = await elasticSecurityApiRequest.call(this, 'PATCH', '/cases', body);

					} else if (operation === 'remove') {

						// https://www.elastic.co/guide/en/security/current/cases-api-update.html

						const caseId = this.getNodeParameter('caseId', i);
						const tagToRemove = this.getNodeParameter('tag', i) as string;

						const {
							title,
							connector,
							owner,
							description,
							settings,
							tags,
						} = await elasticSecurityApiRequest.call(this, 'GET', `/cases/${caseId}`) as IDataObject & { tags: string[] };

						if (!tags.includes(tagToRemove)) {
							throw new NodeOperationError(this.getNode(), `Cannot remove tag "${tagToRemove}" from case ID ${caseId} because this case does not have this tag.`);
						}

						const body = {};

						Object.assign(body, {
							cases: [
								{
									id: caseId,
									title,
									connector,
									owner,
									description,
									settings,
									version: await getVersion.call(this, `/cases/${caseId}`),
									tags: tags.filter((tag) => tag !== tagToRemove),
								},
							],
						});

						responseData = await elasticSecurityApiRequest.call(this, 'PATCH', '/cases', body);

					}

				} else if (resource === 'caseComment') {

					// **********************************************************************
					//                              caseComment
					// **********************************************************************

					if (operation === 'add') {

						// ----------------------------------------
						//             caseComment: add
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-add-comment.html

						const simple = this.getNodeParameter('simple', i) as boolean;

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

						const body = {
							comment: this.getNodeParameter('comment', i),
							type: 'user',
							owner: additionalFields.owner || 'securitySolution',
						} as IDataObject;

						const caseId = this.getNodeParameter('caseId', i);
						const endpoint = `/cases/${caseId}/comments`;
						responseData = await elasticSecurityApiRequest.call(this, 'POST', endpoint, body);

						if (simple === true) {
							const { comments } = responseData;
							responseData = comments[comments.length - 1];
						}

					} else if (operation === 'get') {

						// ----------------------------------------
						//             caseComment: get
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-get-comment.html

						const caseId = this.getNodeParameter('caseId', i);
						const commentId = this.getNodeParameter('commentId', i);

						const endpoint = `/cases/${caseId}/comments/${commentId}`;
						responseData = await elasticSecurityApiRequest.call(this, 'GET', endpoint);

					} else if (operation === 'getAll') {

						// ----------------------------------------
						//           caseComment: getAll
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-get-all-case-comments.html

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

						const endpoint = `/cases/${caseId}/comments`;
						responseData = await handleListing.call(this, 'GET', endpoint);

					} else if (operation === 'remove') {

						// ----------------------------------------
						//           caseComment: remove
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-delete-comment.html

						const caseId = this.getNodeParameter('caseId', i);
						const commentId = this.getNodeParameter('commentId', i);

						const endpoint = `/cases/${caseId}/comments/${commentId}`;
						await elasticSecurityApiRequest.call(this, 'DELETE', endpoint);
						responseData = { success: true };

					} else if (operation === 'update') {

						// ----------------------------------------
						//           caseComment: update
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/cases-api-update-comment.html

						const simple = this.getNodeParameter('simple', i) as boolean;
						const caseId = this.getNodeParameter('caseId', i);
						const commentId = this.getNodeParameter('commentId', i);

						const body = {
							comment: this.getNodeParameter('comment', i),
							id: commentId,
							type: 'user',
							owner: 'securitySolution',
							version: await getVersion.call(this, `/cases/${caseId}/comments/${commentId}`),
						} as IDataObject;

						const patchEndpoint = `/cases/${caseId}/comments`;
						responseData = await elasticSecurityApiRequest.call(this, 'PATCH', patchEndpoint, body);

						if (simple === true) {
							const { comments } = responseData;
							responseData = comments[comments.length - 1];
						}

					}

				} else if (resource === 'connector') {

					if (operation === 'create') {

						// ----------------------------------------
						//           connector: create
						// ----------------------------------------

						// https://www.elastic.co/guide/en/security/current/register-connector.html

						const connectorType = this.getNodeParameter('connectorType', i) as ConnectorType;

						const body: ConnectorCreatePayload = {
							connector_type_id: connectorType,
							name: this.getNodeParameter('name', i) as string,
						};

						if (connectorType === '.jira') {
							body.config = {
								apiUrl: this.getNodeParameter('apiUrl', i) as string,
								projectKey: this.getNodeParameter('projectKey', i) as string,
							};
							body.secrets = {
								email: this.getNodeParameter('email', i) as string,
								apiToken: this.getNodeParameter('apiToken', i) as string,
							};
						} else if (connectorType === '.resilient') {
							body.config = {
								apiUrl: this.getNodeParameter('apiUrl', i) as string,
								orgId: this.getNodeParameter('orgId', i) as string,
							};
							body.secrets = {
								apiKeyId: this.getNodeParameter('apiKeyId', i) as string,
								apiKeySecret: this.getNodeParameter('apiKeySecret', i) as string,
							};
						} else if (connectorType === '.servicenow') {
							body.config = {
								apiUrl: this.getNodeParameter('apiUrl', i) as string,
							};
							body.secrets = {
								username: this.getNodeParameter('username', i) as string,
								password: this.getNodeParameter('password', i) as string,
							};
						}

						responseData = await elasticSecurityApiRequest.call(this, 'POST', '/actions/connector', body);

					}

				}

				Array.isArray(responseData)
					? returnData.push(...responseData)
					: returnData.push(responseData);

			} catch (error) {
				if (this.continueOnFail()) {
					returnData.push({ error: error.message });
					continue;
				}
				throw error;
			}

		}

		return [this.helpers.returnJsonArray(returnData)];
	}
}