import * as formidable from 'formidable';

import {
	IHookFunctions,
	IWebhookFunctions,
} from 'n8n-core';

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

import {
	jotformApiRequest,
} from './GenericFunctions';


interface IQuestionData {
	name: string;
	text: string;
}

export class JotFormTrigger implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'JotForm Trigger',
		name: 'jotFormTrigger',
		icon: 'file:jotform.png',
		group: ['trigger'],
		version: 1,
		description: 'Handle JotForm events via webhooks',
		defaults: {
			name: 'JotForm Trigger',
			color: '#fa8900',
		},
		inputs: [],
		outputs: ['main'],
		credentials: [
			{
				name: 'jotFormApi',
				required: true,
			}
		],
		webhooks: [
			{
				name: 'default',
				httpMethod: 'POST',
				responseMode: 'onReceived',
				path: 'webhook',
			},
		],
		properties: [
			{
				displayName: 'Form',
				name: 'form',
				type: 'options',
				required: true,
				typeOptions: {
					loadOptionsMethod: 'getForms'
				},
				default: '',
				description: '',
			},
			{
				displayName: 'Resolve Data',
				name: 'resolveData',
				type: 'boolean',
				default: true,
				description: 'By default does the webhook-data use internal keys instead of the names.<br />If this option gets activated it will resolve the keys automatically to the actual names.',
			},
			{
				displayName: 'Only Answers',
				name: 'onlyAnswers',
				type: 'boolean',
				default: true,
				description: 'Returns only the answers of the form and not any of the other data.',
			},
		],

	};

	methods = {
		loadOptions: {
			// Get all the available forms to display them to user so that he can
			// select them easily
			async getForms(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const qs: IDataObject = {
					limit: 1000,
				 };
				const forms = await jotformApiRequest.call(this, 'GET', '/user/forms', {}, qs);
				for (const form of forms.content) {
					const formName = form.title;
					const formId = form.id;
					returnData.push({
						name: formName,
						value: formId,
					});
				}
				return returnData;
			},
		},
	};
	// @ts-ignore
	webhookMethods = {
		default: {
			async checkExists(this: IHookFunctions): Promise<boolean> {
				const webhookData = this.getWorkflowStaticData('node');
				const formId = this.getNodeParameter('form') as string;
				const endpoint = `/form/${formId}/webhooks`;

				try {
					const responseData = await jotformApiRequest.call(this, 'GET', endpoint);

					const webhookUrls = Object.values(responseData.content);
					const webhookUrl = this.getNodeWebhookUrl('default');
					if (!webhookUrls.includes(webhookUrl)) {
						return false;
					}

					const webhookIds = Object.keys(responseData.content);
					webhookData.webhookId = webhookIds[webhookUrls.indexOf(webhookUrl)];
				} catch (e) {
					return false;
				}
				return true;
			},
			async create(this: IHookFunctions): Promise<boolean> {
				const webhookUrl = this.getNodeWebhookUrl('default');
				const webhookData = this.getWorkflowStaticData('node');
				const formId = this.getNodeParameter('form') as string;
				const endpoint = `/form/${formId}/webhooks`;
				const body: IDataObject = {
					webhookURL: webhookUrl,
					//webhookURL: 'https://en0xsizp3qyt7f.x.pipedream.net/',
				};
				const { content } = await jotformApiRequest.call(this, 'POST', endpoint, body);
				webhookData.webhookId = Object.keys(content)[0];
				return true;
			},
			async delete(this: IHookFunctions): Promise<boolean> {
				let responseData;
				const webhookData = this.getWorkflowStaticData('node');
				const formId = this.getNodeParameter('form') as string;
				const endpoint = `/form/${formId}/webhooks/${webhookData.webhookId}`;
				try {
					responseData = await jotformApiRequest.call(this, 'DELETE', endpoint);
				} catch(error) {
					return false;
				}
				if (responseData.message !== 'success') {
					return false;
				}
				delete webhookData.webhookId;
				return true;
			},
		},
	};

	//@ts-ignore
	async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
		const req = this.getRequestObject();
		const formId = this.getNodeParameter('form') as string;
		const resolveData = this.getNodeParameter('resolveData', false) as boolean;
		const onlyAnswers = this.getNodeParameter('onlyAnswers', false) as boolean;

		const form = new formidable.IncomingForm();

		return new Promise((resolve, reject) => {

			form.parse(req, async (err, data, files) => {

				const rawRequest = JSON.parse(data.rawRequest as string);
				data.rawRequest = rawRequest;

				let returnData: IDataObject;
				if (resolveData === false) {
					if (onlyAnswers === true) {
						returnData = data.rawRequest as unknown as IDataObject;
					} else {
						returnData = data;
					}

					resolve({
						workflowData: [
							this.helpers.returnJsonArray(returnData),
						],
					});
				}

				// Resolve the data by requesting the information via API
				const endpoint = `/form/${formId}/questions`;
				const responseData = await jotformApiRequest.call(this, 'GET', endpoint, {});

				// Create a dictionary to resolve the keys
				const questionNames: IDataObject = {};
				for (const question of Object.values(responseData.content) as IQuestionData[]) {
					questionNames[question.name] = question.text;
				}

				// Resolve the keys
				let questionKey: string;
				const questionsData: IDataObject = {};
				for (const key of Object.keys(rawRequest)) {
					if (!key.includes('_')) {
						continue;
					}

					questionKey = key.split('_').slice(1).join('_');
					if (questionNames[questionKey] === undefined) {
						continue;
					}

					questionsData[questionNames[questionKey] as string] = rawRequest[key];
				}

				if (onlyAnswers === true) {
					returnData = questionsData as unknown as IDataObject;
				} else {
					// @ts-ignore
					data.rawRequest = questionsData;
					returnData = data;
				}

				resolve({
					workflowData: [
						this.helpers.returnJsonArray(returnData),
					],
				});
			});

		});
	}
}