import {
	BINARY_ENCODING,
	IExecuteFunctions,
} from 'n8n-core';
import {
	IDataObject,
	INodeExecutionData,
	INodeType,
	INodeTypeDescription,
	NodeApiError,
	NodeOperationError,
} from 'n8n-workflow';


export class Mailgun implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Mailgun',
		name: 'mailgun',
		icon: 'file:mailgun.svg',
		group: ['output'],
		version: 1,
		description: 'Sends an email via Mailgun',
		defaults: {
			name: 'Mailgun',
			color: '#c02428',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'mailgunApi',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'From Email',
				name: 'fromEmail',
				type: 'string',
				default: '',
				required: true,
				placeholder: 'Admin <admin@example.com>',
				description: 'Email address of the sender optional with name.',
			},
			{
				displayName: 'To Email',
				name: 'toEmail',
				type: 'string',
				default: '',
				required: true,
				placeholder: 'info@example.com',
				description: 'Email address of the recipient. Multiple ones can be separated by comma.',
			},
			{
				displayName: 'Cc Email',
				name: 'ccEmail',
				type: 'string',
				default: '',
				placeholder: '',
				description: 'Cc Email address of the recipient. Multiple ones can be separated by comma.',
			},
			{
				displayName: 'Bcc Email',
				name: 'bccEmail',
				type: 'string',
				default: '',
				placeholder: '',
				description: 'Bcc Email address of the recipient. Multiple ones can be separated by comma.',
			},
			{
				displayName: 'Subject',
				name: 'subject',
				type: 'string',
				default: '',
				placeholder: 'My subject line',
				description: 'Subject line of the email.',
			},
			{
				displayName: 'Text',
				name: 'text',
				type: 'string',
				typeOptions: {
					alwaysOpenEditWindow: true,
					rows: 5,
				},
				default: '',
				description: 'Plain text message of email.',
			},
			{
				displayName: 'HTML',
				name: 'html',
				type: 'string',
				typeOptions: {
					rows: 5,
				},
				default: '',
				description: 'HTML text message of email.',
			},
			{
				displayName: 'Attachments',
				name: 'attachments',
				type: 'string',
				default: '',
				description: 'Name of the binary properties which contain<br />data which should be added to email as attachment.<br />Multiple ones can be comma separated.',
			},
		],
	};


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

		const returnData: INodeExecutionData[] = [];
		const length = items.length as unknown as number;
		let item: INodeExecutionData;

		for (let itemIndex = 0; itemIndex < length; itemIndex++) {
			try {
				item = items[itemIndex];

				const fromEmail = this.getNodeParameter('fromEmail', itemIndex) as string;
				const toEmail = this.getNodeParameter('toEmail', itemIndex) as string;
				const ccEmail = this.getNodeParameter('ccEmail', itemIndex) as string;
				const bccEmail = this.getNodeParameter('bccEmail', itemIndex) as string;
				const subject = this.getNodeParameter('subject', itemIndex) as string;
				const text = this.getNodeParameter('text', itemIndex) as string;
				const html = this.getNodeParameter('html', itemIndex) as string;
				const attachmentPropertyString = this.getNodeParameter('attachments', itemIndex) as string;

				const credentials = this.getCredentials('mailgunApi');

				if (credentials === undefined) {
					throw new NodeOperationError(this.getNode(), 'No credentials got returned!');
				}

				const formData: IDataObject = {
					from: fromEmail,
					to: toEmail,
					subject,
					text,
					html,
				};

				if (ccEmail.length !== 0) {
					formData.cc = ccEmail;
				}
				if (bccEmail.length !== 0) {
					formData.bcc = bccEmail;
				}

				if (attachmentPropertyString && item.binary) {

					const attachments = [];
					const attachmentProperties: string[] = attachmentPropertyString.split(',').map((propertyName) => {
						return propertyName.trim();
					});

					for (const propertyName of attachmentProperties) {
						if (!item.binary.hasOwnProperty(propertyName)) {
							continue;
						}
						attachments.push({
							value: Buffer.from(item.binary[propertyName].data, BINARY_ENCODING),
							options: {
								filename: item.binary[propertyName].fileName || 'unknown',

							},
						});
					}

					if (attachments.length) {
						// @ts-ignore
						formData.attachment = attachments;
					}
				}

				const options = {
					method: 'POST',
					formData,
					uri: `https://${credentials.apiDomain}/v3/${credentials.emailDomain}/messages`,
					auth: {
						user: 'api',
						pass: credentials.apiKey as string,
					},
					json: true,
				};

				let responseData;

				try {
					responseData = await this.helpers.request(options);
				} catch (error) {
					throw new NodeApiError(this.getNode(), error);
				}

				returnData.push({
					json: responseData,
				});
			} catch (error) {
				if (this.continueOnFail()) {
					returnData.push({ json: { error: error.message } });
					continue;
				}
				throw error;
			}
		}
		return this.prepareOutputData(returnData);
	}
}