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

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

import {
	mapEndpoint,
	serviceNowApiRequest,
	serviceNowRequestAllItems,
	sortData
} from './GenericFunctions';

import {
	businessServiceFields,
	businessServiceOperations,
} from './BusinessServiceDescription';

import {
	configurationItemsFields,
	configurationItemsOperations,
} from './ConfigurationItemsDescription';

import {
	departmentFields,
	departmentOperations,
} from './DepartmentDescription';

import {
	dictionaryFields,
	dictionaryOperations,
} from './DictionaryDescription';

import {
	incidentFields,
	incidentOperations,
} from './IncidentDescription';

import {
	tableRecordFields,
	tableRecordOperations,
} from './TableRecordDescription';

import {
	userFields,
	userOperations,
} from './UserDescription';

import {
	userGroupFields,
	userGroupOperations,
} from './UserGroupDescription';

import {
	userRoleFields,
	userRoleOperations,
} from './UserRoleDescription';

export class ServiceNow implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'ServiceNow',
		name: 'serviceNow',
		icon: 'file:servicenow.svg',
		group: ['output'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Consume ServiceNow API',
		defaults: {
			name: 'ServiceNow',
			color: '#81b5a1',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'serviceNowOAuth2Api',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Business Service',
						value: 'businessService',
					},
					{
						name: 'Configuration Items',
						value: 'configurationItems',
					},
					{
						name: 'Department',
						value: 'department',
					},
					{
						name: 'Dictionary',
						value: 'dictionary',
					},
					{
						name: 'Incident',
						value: 'incident',
					},
					{
						name: 'Table Record',
						value: 'tableRecord',
					},
					{
						name: 'User',
						value: 'user',
					},
					{
						name: 'User Group',
						value: 'userGroup',
					},
					{
						name: 'User Role',
						value: 'userRole',
					},
				],
				default: 'user',
				description: 'Resource to consume',
			},

			// BUSINESS SERVICE
			...businessServiceOperations,
			...businessServiceFields,
			// CONFIGURATION ITEMS
			...configurationItemsOperations,
			...configurationItemsFields,
			// DEPARTMENT
			...departmentOperations,
			...departmentFields,
			// DICTIONARY
			...dictionaryOperations,
			...dictionaryFields,
			// INCIDENT
			...incidentOperations,
			...incidentFields,
			// TABLE RECORD
			...tableRecordOperations,
			...tableRecordFields,
			// USER
			...userOperations,
			...userFields,
			// USER GROUP
			...userGroupOperations,
			...userGroupFields,
			// USER ROLE
			...userRoleOperations,
			...userRoleFields,
		],
	};

	methods = {
		loadOptions: {
			async getTables(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const response = await serviceNowApiRequest.call(this, 'GET', `/now/doc/table/schema`, {}, {});
				for (const table of response.result) {
					returnData.push({
						name: table.label,
						value: table.value,
						description: table.value,
					});
				}
				return sortData(returnData);
			},
			// Get all the table column to display them to user
			async getColumns(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const resource = this.getNodeParameter('resource', 0) as string;
				const operation = this.getNodeParameter('operation', 0) as string;
				const returnData: INodePropertyOptions[] = [];
				let tableName;
				if (resource === 'tableRecord') {
					tableName = this.getNodeParameter('tableName') as string;
				} else {
					tableName = mapEndpoint(resource, operation);
				}

				const qs = {
					sysparm_query: `name=${tableName}`,
					sysparm_fields: 'column_label,element',
				};
				const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/sys_dictionary`, {}, qs);
				for (const column of response.result) {
					if (column.element) {
						returnData.push({
							name: column.column_label,
							value: column.element,
						});
					}
				}
				return sortData(returnData);
			},
			async getBusinessServices(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'name,sys_id',
				};
				const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/cmdb_ci_service`, {}, qs);

				for (const column of response.result) {
					returnData.push({
						name: column.name,
						value: column.sys_id,
					});
				}
				return sortData(returnData);
			},
			async getUsers(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const resource = this.getNodeParameter('resource', 0) as string;
				const operation = this.getNodeParameter('operation', 0) as string;

				const qs = {
					sysparm_fields: 'sys_id,user_name',
				};
				if (resource === 'incident' && operation === 'create') {
					const additionalFields = this.getNodeParameter('additionalFields') as IDataObject;
					const group = additionalFields.assignment_group;

					const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user_grmember', {}, {
						sysparm_query: `group=${group}^`,
					});

					for (const column of response) {
						if (column.user) {

							const responseData = await serviceNowApiRequest.call(this, 'GET', `/now/table/sys_user/${column.user.value}`, {}, {});
							const user = responseData.result;

							returnData.push({
								name: user.user_name,
								value: user.sys_id,
							});
						}
					}
				} else {

					const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user', {}, qs);

					for (const column of response) {
						if (column.user_name) {
							returnData.push({
								name: column.user_name,
								value: column.sys_id,
							});
						}
					}
				}
				return sortData(returnData);
			},
			async getAssignmentGroups(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'sys_id,name',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user_group', {}, qs);

				for (const column of response) {
					if (column.name) {
						returnData.push({
							name: column.name,
							value: column.sys_id,
						});
					}
				}
				return sortData(returnData);
			},
			async getUserRoles(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'sys_id,name',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user_role', {}, qs);

				for (const column of response) {
					if (column.name) {
						returnData.push({
							name: column.name,
							value: column.sys_id,
						});
					}
				}
				return sortData(returnData);
			},
			async getConfigurationItems(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'sys_id,name,sys_class_name',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/cmdb_ci', {}, qs);

				for (const column of response) {
					if (column.name) {
						returnData.push({
							name: column.name,
							value: column.sys_id,
							description: column.sys_class_name,
						});
					}
				}
				return sortData(returnData);
			},
			async getIncidentCategories(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'label,value',
					sysparm_query: 'element=category^name=incident',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_choice', {}, qs);

				for (const column of response) {
					returnData.push({
						name: column.label,
						value: column.value,
					});

				}
				return sortData(returnData);
			},
			async getIncidentSubcategories(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const operation = this.getNodeParameter('operation');
				let category;
				if (operation === 'update') {
					const updateFields = this.getNodeParameter('updateFields') as IDataObject;
					category = updateFields.category;
				} else {
					const additionalFields = this.getNodeParameter('additionalFields') as IDataObject;
					category = additionalFields.category;
				}
				const qs = {
					sysparm_fields: 'label,value',
					sysparm_query: `name=incident^element=subcategory^dependent_value=${category}`,
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_choice', {}, qs);

				for (const column of response) {
					returnData.push({
						name: column.label,
						value: column.value,
					});
				}

				return sortData(returnData);
			},
			async getIncidentStates(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'label,value',
					sysparm_query: 'element=state^name=incident',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_choice', {}, qs);

				for (const column of response) {
					returnData.push({
						name: column.label,
						value: column.value,
					});

				}
				return sortData(returnData);
			},
			async getIncidentResolutionCodes(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'label,value',
					sysparm_query: 'element=close_code^name=incident',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_choice', {}, qs);

				for (const column of response) {
					returnData.push({
						name: column.label,
						value: column.value,
					});

				}
				return sortData(returnData);
			},
			async getIncidentHoldReasons(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs = {
					sysparm_fields: 'label,value',
					sysparm_query: 'element=hold_reason^name=incident',
				};
				const response = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_choice', {}, qs);

				for (const column of response) {
					returnData.push({
						name: column.label,
						value: column.value,
					});

				}
				return sortData(returnData);
			},
		},
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: IDataObject[] = [];
		const length = items.length;
		let responseData = {};
		let qs: IDataObject;
		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;

		for (let i = 0; i < length; i++) {
			try {
				if (resource === 'businessService') {

					if (operation === 'getAll') {

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/cmdb_ci_service', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/cmdb_ci_service', {}, qs);
						}

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

					if (operation === 'getAll') {

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/cmdb_ci', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/cmdb_ci', {}, qs);
						}

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

					if (operation === 'getAll') {

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/cmn_department', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/cmn_department', {}, qs);
						}

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

					if (operation === 'getAll') {

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/sys_dictionary', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_dictionary', {}, qs);
						}

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

					if (operation === 'create') {

						const shortDescription = this.getNodeParameter('short_description', i) as string;
						const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
						const body = {
							short_description: shortDescription,
							...additionalFields,
						};

						const response = await serviceNowApiRequest.call(this, 'POST', `/now/table/incident`, body);
						responseData = response.result;

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

						const id = this.getNodeParameter('id', i) as string;
						responseData = await serviceNowApiRequest.call(this, 'DELETE', `/now/table/incident/${id}`);
						responseData = { success: true };

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

						const id = this.getNodeParameter('id', i) as string;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/incident/${id}`, {}, qs);
						responseData = response.result;

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

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/incident`, {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', `/now/table/incident`, {}, qs);
						}

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

						const id = this.getNodeParameter('id', i) as string;
						const body = this.getNodeParameter('updateFields', i) as IDataObject;

						const response = await serviceNowApiRequest.call(this, 'PATCH', `/now/table/incident/${id}`, body);
						responseData = response.result;

					} else {
						throw new NodeOperationError(this.getNode(), `The operation "${operation}" is not known!`);
					}
				} else if (resource === 'tableRecord') {

					if (operation === 'create') {

						const tableName = this.getNodeParameter('tableName', i) as string;
						const dataToSend = this.getNodeParameter('dataToSend', i) as string;
						let body = {};

						if (dataToSend === 'mapInput') {
							const inputsToIgnore = (this.getNodeParameter('inputsToIgnore', i) as string).split(',').map(field => field.trim());
							body = Object.entries(items[i].json)
								.filter(([key]) => !inputsToIgnore.includes(key))
								.reduce((obj, [key, val]) => Object.assign(obj, { [key]: val }), {});
						} else if (dataToSend === 'columns') {
							const fieldsToSend = this.getNodeParameter('fieldsToSend', i) as {
								field: IDataObject[]
							};
							body = fieldsToSend.field.reduce((obj, field) => {
								obj[field.column as string] = field.value;
								return obj;
							}, {});
						}

						const response = await serviceNowApiRequest.call(this, 'POST', `/now/table/${tableName}`, body);
						responseData = response.result;

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

						const tableName = this.getNodeParameter('tableName', i) as string;
						const id = this.getNodeParameter('id', i) as string;
						responseData = await serviceNowApiRequest.call(this, 'DELETE', `/now/table/${tableName}/${id}`);
						responseData = { success: true };

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

						const tableName = this.getNodeParameter('tableName', i) as string;
						const id = this.getNodeParameter('id', i) as string;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/${tableName}/${id}`, {}, qs);
						responseData = response.result;

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

						const tableName = this.getNodeParameter('tableName', i) as string;
						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/${tableName}`, {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', `/now/table/${tableName}`, {}, qs);
						}


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

						const tableName = this.getNodeParameter('tableName', i) as string;
						const id = this.getNodeParameter('id', i) as string;
						const dataToSend = this.getNodeParameter('dataToSend', i) as string;
						let body = {};

						if (dataToSend === 'mapInput') {
							const inputsToIgnore = (this.getNodeParameter('inputsToIgnore', i) as string).split(',').map(field => field.trim());
							body = Object.entries(items[i].json)
								.filter(([key]) => !inputsToIgnore.includes(key))
								.reduce((obj, [key, val]) => Object.assign(obj, { [key]: val }), {});
						} else if (dataToSend === 'columns') {
							const fieldsToSend = this.getNodeParameter('fieldsToSend', i) as {
								field: IDataObject[]
							};
							body = fieldsToSend.field.reduce((obj, field) => {
								obj[field.column as string] = field.value;
								return obj;
							}, {});
						}

						const response = await serviceNowApiRequest.call(this, 'PATCH', `/now/table/${tableName}/${id}`, body);
						responseData = response.result;

					} else {
						throw new NodeOperationError(this.getNode(), `The operation "${operation}" is not known!`);
					}
				} else if (resource === 'user') {

					if (operation === 'create') {

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

						const response = await serviceNowApiRequest.call(this, 'POST', '/now/table/sys_user', body);
						responseData = response.result;

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

						const id = this.getNodeParameter('id', i) as string;
						responseData = await serviceNowApiRequest.call(this, 'DELETE', `/now/table/sys_user/${id}`);
						responseData = { success: true };

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

						const getOption = this.getNodeParameter('getOption', i) as string;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (getOption === 'id') {
							const id = this.getNodeParameter('id', i) as string;
							const response = await serviceNowApiRequest.call(this, 'GET', `/now/table/sys_user/${id}`, {}, qs);
							responseData = response.result;
						} else {
							const userName = this.getNodeParameter('user_name', i) as string;
							qs.sysparm_query = `user_name=${userName}`;
							qs.sysparm_limit = 1;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/sys_user', {}, qs);
							responseData = response.result;
						}

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

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/sys_user', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user', {}, qs);
						}

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

						const id = this.getNodeParameter('id', i) as string;
						const body = this.getNodeParameter('updateFields', i) as IDataObject;

						const response = await serviceNowApiRequest.call(this, 'PATCH', `/now/table/sys_user/${id}`, body);
						responseData = response.result;

					} else {
						throw new NodeOperationError(this.getNode(), `The operation "${operation}" is not known!`);
					}
				} else if (resource === 'userGroup') {
					if (operation === 'getAll') {

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/sys_user_group', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user_group', {}, qs);
						}
					} else {
						throw new NodeOperationError(this.getNode(), `The operation "${operation}" is not known!`);
					}
				} else if (resource === 'userRole') {
					if (operation === 'getAll') {

						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						qs = this.getNodeParameter('options', i) as IDataObject;

						if (qs.sysparm_fields) {
							qs.sysparm_fields = (qs.sysparm_fields as string[]).join(',');
						}

						if (!returnAll) {
							const limit = this.getNodeParameter('limit', i) as number;
							qs.sysparm_limit = limit;
							const response = await serviceNowApiRequest.call(this, 'GET', '/now/table/sys_user_role', {}, qs);
							responseData = response.result;
						} else {
							responseData = await serviceNowRequestAllItems.call(this, 'GET', '/now/table/sys_user_role', {}, qs);
						}
					} else {
						throw new NodeOperationError(this.getNode(), `The operation "${operation}" is not known!`);
					}
				} else {
					throw new NodeOperationError(this.getNode(), `The resource "${resource}" is not known!`);
				}
			} catch (error) {
				if (this.continueOnFail()) {
					returnData.push({ error: error.message });
					continue;
				}

				throw error;
			}

			Array.isArray(responseData)
				? returnData.push(...responseData)
				: returnData.push(responseData);
		}
		return [this.helpers.returnJsonArray(returnData)];
	}
}