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

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

import {
	documentFields,
	documentOperations,
} from './DocumentDescription';

import {
	erpNextApiRequest,
	erpNextApiRequestAllItems
} from './GenericFunctions';

import {
	DocumentProperties,
	processNames,
	toSQL,
} from './utils';

export class ERPNext implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'ERPNext',
		name: 'erpNext',
		icon: 'file:erpnext.svg',
		group: ['output'],
		version: 1,
		subtitle: '={{$parameter["resource"] + ": " + $parameter["operation"]}}',
		description: 'Consume ERPNext API',
		defaults: {
			name: 'ERPNext',
			color: '#7574ff',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'erpNextApi',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Document',
						value: 'document',
					},
				],
				default: 'document',
				description: 'Resource to consume.',
			},
			...documentOperations,
			...documentFields,
		],
	};

	methods = {
		loadOptions: {
			async getDocTypes(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const data = await erpNextApiRequestAllItems.call(this, 'data', 'GET', '/api/resource/DocType', {});
				const docTypes = data.map(({ name }: { name: string }) => {
					return { name, value: encodeURI(name) };
				});

				return processNames(docTypes);
			},
			async getDocFilters(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const docType = this.getCurrentNodeParameter('docType') as string;
				const { data } = await erpNextApiRequest.call(this, 'GET', `/api/resource/DocType/${docType}`, {});

				const docFields = data.fields.map(({ label, fieldname }: { label: string, fieldname: string }) => {
					return ({ name: label, value: fieldname });
				});

				docFields.unshift({ name: '*', value: '*' });

				return processNames(docFields);
			},
			async getDocFields(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const docType = this.getCurrentNodeParameter('docType') as string;
				const { data } = await erpNextApiRequest.call(this, 'GET', `/api/resource/DocType/${docType}`, {});

				const docFields = data.fields.map(({ label, fieldname }: { label: string, fieldname: string }) => {
					return ({ name: label, value: fieldname });
				});

				return processNames(docFields);
			},
		},
	};

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

		const returnData: IDataObject[] = [];
		let responseData;

		const body: IDataObject = {};
		const qs: IDataObject = {};

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

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

			// https://app.swaggerhub.com/apis-docs/alyf.de/ERPNext/11#/Resources/post_api_resource_Webhook
			// https://frappeframework.com/docs/user/en/guides/integration/rest_api/manipulating_documents

			if (resource === 'document') {

				// *********************************************************************
				//                             document
				// *********************************************************************

				if (operation === 'get') {

					// ----------------------------------
					//          document: get
					// ----------------------------------

					// https://app.swaggerhub.com/apis-docs/alyf.de/ERPNext/11#/General/get_api_resource__DocType___DocumentName_

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

					responseData = await erpNextApiRequest.call(this, 'GET', `/api/resource/${docType}/${documentName}`);
					responseData = responseData.data;
				}

				if (operation === 'getAll') {

					// ----------------------------------
					//         document: getAll
					// ----------------------------------

					// https://app.swaggerhub.com/apis-docs/alyf.de/ERPNext/11#/General/get_api_resource__DocType_

					const docType = this.getNodeParameter('docType', i) as string;
					const endpoint = `/api/resource/${docType}`;

					const {
						fields,
						filters,
					} = this.getNodeParameter('options', i) as {
						fields: string[],
						filters: {
							customProperty: Array<{ field: string, operator: string, value: string }>,
						},
					};

					// fields=["test", "example", "hi"]
					if (fields) {
						if (fields.includes('*')) {
							qs.fields = JSON.stringify(['*']);
						} else {
							qs.fields = JSON.stringify(fields);
						}
					}
					// filters=[["Person","first_name","=","Jane"]]
					// TODO: filters not working
					if (filters) {
						qs.filters = JSON.stringify(filters.customProperty.map((filter) => {
							return [
								docType,
								filter.field,
								toSQL(filter.operator),
								filter.value,
							];
						}));
					}

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

					if (!returnAll) {
						const limit = this.getNodeParameter('limit', i) as number;
						qs.limit_page_length = limit;
						qs.limit_start = 0;
						responseData = await erpNextApiRequest.call(this, 'GET', endpoint, {}, qs);
						responseData = responseData.data;

					} else {
						responseData = await erpNextApiRequestAllItems.call(this, 'data', 'GET', endpoint, {}, qs);
					}

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

					// ----------------------------------
					//         document: create
					// ----------------------------------

					// https://app.swaggerhub.com/apis-docs/alyf.de/ERPNext/11#/General/post_api_resource__DocType_

					const properties = this.getNodeParameter('properties', i) as DocumentProperties;

					if (!properties.customProperty.length) {
						throw new Error('Please enter at least one property for the document to create.');
					}

					properties.customProperty.forEach(property => {
						body[property.field] = property.value;
					});

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

					responseData = await erpNextApiRequest.call(this, 'POST', `/api/resource/${docType}`, body);
					responseData = responseData.data;

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

					// ----------------------------------
					//         document: delete
					// ----------------------------------

					// https://app.swaggerhub.com/apis-docs/alyf.de/ERPNext/11#/General/delete_api_resource__DocType___DocumentName_

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

					responseData = await erpNextApiRequest.call(this, 'DELETE', `/api/resource/${docType}/${documentName}`);

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

					// ----------------------------------
					//         document: update
					// ----------------------------------

					// https://app.swaggerhub.com/apis-docs/alyf.de/ERPNext/11#/General/put_api_resource__DocType___DocumentName_

					const properties = this.getNodeParameter('properties', i) as DocumentProperties;

					if (!properties.customProperty.length) {
						throw new Error('Please enter at least one property for the document to update.');
					}

					properties.customProperty.forEach(property => {
						body[property.field] = property.value;
					});

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

					responseData = await erpNextApiRequest.call(this, 'PUT', `/api/resource/${docType}/${documentName}`, body);
					responseData = responseData.data;

				}
			}

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

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