import { IExecuteFunctions } from 'n8n-core';

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

import {
	listFields,
	listOperations,
} from './ListDescription';

import {
	contactFields,
	contactOperations
} from './ContactDescription';

import {
	mailFields,
	mailOperations,
	SendMailBody,
} from './MailDescription';

import {
	sendGridApiRequest,
	sendGridApiRequestAllItems,
} from './GenericFunctions';

import moment from 'moment-timezone';

export class SendGrid implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'SendGrid',
		name: 'sendGrid',
		icon: 'file:sendGrid.svg',
		group: ['transform'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ":" + $parameter["resource"]}}',
		description: 'Consume SendGrid API',
		defaults: {
			name: 'SendGrid',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'sendGridApi',
				required: true,
			},
		],
		properties: [
			// Node properties which the user gets displayed and
			// can change on the node.
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Contact',
						value: 'contact',
					},
					{
						name: 'List',
						value: 'list',
					},
					{
						name: 'Mail',
						value: 'mail',
					},
				],
				default: 'list',
				required: true,
				description: 'Resource to consume',
			},
			...listOperations,
			...listFields,
			...contactOperations,
			...contactFields,
			...mailOperations,
			...mailFields,
		],
	};

	methods = {
		loadOptions: {
			// Get custom fields to display to user so that they can select them easily
			async getCustomFields(this: ILoadOptionsFunctions,): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const { custom_fields } = await sendGridApiRequest.call(this, '/marketing/field_definitions', 'GET', {}, {});
				if (custom_fields !== undefined) {
					for (const customField of custom_fields) {
						returnData.push({
							name: customField.name,
							value: customField.id,
						});
					}
				}
				return returnData;
			},
			// Get lists to display to user so that they can select them easily
			async getListIds(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const lists = await sendGridApiRequestAllItems.call(this, `/marketing/lists`, 'GET', 'result', {}, {});
				for (const list of lists) {
					returnData.push({
						name: list.name,
						value: list.id,
					});
				}
				return returnData;
			},
			async getTemplateIds(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const responseData = await sendGridApiRequest.call(this, '/templates', 'GET', {}, { generations: 'dynamic' });
				return responseData.templates.map(({ id, name }: { id: string, name: string }) => ({ name, value: id }));
			},
		},
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const length = items.length;
		const qs: IDataObject = {};
		let responseData;
		const timezone = this.getTimezone();
		const returnData: IDataObject[] = [];
		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;
		// https://sendgrid.com/docs/api-reference/
		if (resource === 'contact') {
			if (operation === 'getAll') {
				for (let i = 0; i < length; i++) {
					try {
						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						const filters = this.getNodeParameter('filters', i) as IDataObject;
						let endpoint = '/marketing/contacts';
						let method = 'GET';
						const body: IDataObject = {};
						if (filters.query && filters.query !== '') {
							endpoint = '/marketing/contacts/search';
							method = 'POST';
							Object.assign(body, { query: filters.query });
						}
						responseData = await sendGridApiRequestAllItems.call(this, endpoint, method, 'result', body, qs);
						if (returnAll === false) {
							const limit = this.getNodeParameter('limit', i) as number;
							responseData = responseData.splice(0, limit);
						}
						returnData.push.apply(returnData, responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
			if (operation === 'get') {
				const by = this.getNodeParameter('by', 0) as string;
				let endpoint;
				let method;
				const body: IDataObject = {};
				for (let i = 0; i < length; i++) {
					try {
						if (by === 'id') {
							method = 'GET';
							const contactId = this.getNodeParameter('contactId', i) as string;
							endpoint = `/marketing/contacts/${contactId}`;
						} else {
							const email = this.getNodeParameter('email', i) as string;
							endpoint = '/marketing/contacts/search';
							method = 'POST';
							Object.assign(body, { query: `email LIKE '${email}' ` });
						}
						responseData = await sendGridApiRequest.call(this, endpoint, method, body, qs);
						responseData = responseData.result || responseData;
						if (Array.isArray(responseData)) {
							responseData = responseData[0];
						}
						returnData.push(responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
			if (operation === 'upsert') {
				try {
					const contacts = [];
					let lists;
					for (let i = 0; i < length; i++) {
						const email = this.getNodeParameter('email', i) as string;
						const additionalFields = this.getNodeParameter(
							'additionalFields',
							i,
						) as IDataObject;
						const contact: IDataObject = {
							email,
						};
						if (additionalFields.addressUi) {
							const addressValues = (additionalFields.addressUi as IDataObject).addressValues as IDataObject;
							const addressLine1 = addressValues.address1 as string;
							const addressLine2 = addressValues.address2 as string;
							if (addressLine2) {
								Object.assign(contact, { address_line_2: addressLine2 });
							}
							Object.assign(contact, { address_line_1: addressLine1 });
						}
						if (additionalFields.city) {
							const city = additionalFields.city as string;
							Object.assign(contact, { city });
						}
						if (additionalFields.country) {
							const country = additionalFields.country as string;
							Object.assign(contact, { country });
						}
						if (additionalFields.firstName) {
							const firstName = additionalFields.firstName as string;
							Object.assign(contact, { first_name: firstName });
						}
						if (additionalFields.lastName) {
							const lastName = additionalFields.lastName as string;
							Object.assign(contact, { last_name: lastName });
						}
						if (additionalFields.postalCode) {
							const postalCode = additionalFields.postalCode as string;
							Object.assign(contact, { postal_code: postalCode });
						}
						if (additionalFields.stateProvinceRegion) {
							const stateProvinceRegion = additionalFields.stateProvinceRegion as string;
							Object.assign(contact, { state_province_region: stateProvinceRegion });
						}
						if (additionalFields.alternateEmails) {
							const alternateEmails = ((additionalFields.alternateEmails as string).split(',') as string[]).filter(email => !!email);
							if (alternateEmails.length !== 0) {
								Object.assign(contact, { alternate_emails: alternateEmails });
							}
						}
						if (additionalFields.listIdsUi) {
							const listIdValues = (additionalFields.listIdsUi as IDataObject).listIdValues as IDataObject;
							const listIds = listIdValues.listIds as IDataObject[];
							lists = listIds;
						}
						if (additionalFields.customFieldsUi) {
							const customFields = (additionalFields.customFieldsUi as IDataObject).customFieldValues as IDataObject[];
							if (customFields) {
								const data = customFields.reduce((obj, value) => Object.assign(obj, { [`${value.fieldId}`]: value.fieldValue }), {});
								Object.assign(contact, { custom_fields: data });
							}
						}
						contacts.push(contact);
					}
					responseData = await sendGridApiRequest.call(this, '/marketing/contacts', 'PUT', { list_ids: lists, contacts }, qs);
					returnData.push(responseData);
				} catch (error) {
					if (this.continueOnFail()) {
						returnData.push({ error: error.message });
					} else {
						throw error;
					}
				}
			}
			if (operation === 'delete') {
				for (let i = 0; i < length; i++) {
					try {
						const deleteAll = this.getNodeParameter('deleteAll', i) as boolean;
						if (deleteAll === true) {
							qs.delete_all_contacts = 'true';
						}
						qs.ids = (this.getNodeParameter('ids', i) as string).replace(/\s/g, '');
						responseData = await sendGridApiRequest.call(this, `/marketing/contacts`, 'DELETE', {}, qs);
						returnData.push(responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
		}
		if (resource === 'list') {
			if (operation === 'getAll') {
				for (let i = 0; i < length; i++) {
					try {
						const returnAll = this.getNodeParameter('returnAll', i) as boolean;
						responseData = await sendGridApiRequestAllItems.call(this, `/marketing/lists`, 'GET', 'result', {}, qs);
						if (returnAll === false) {
							const limit = this.getNodeParameter('limit', i) as number;
							responseData = responseData.splice(0, limit);
						}
						returnData.push.apply(returnData, responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
			if (operation === 'get') {
				for (let i = 0; i < length; i++) {
					try {
						const listId = this.getNodeParameter('listId', i) as string;
						qs.contact_sample = this.getNodeParameter('contactSample', i) as boolean;
						responseData = await sendGridApiRequest.call(this, `/marketing/lists/${listId}`, 'GET', {}, qs);
						returnData.push(responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
			if (operation === 'create') {
				for (let i = 0; i < length; i++) {
					try {
						const name = this.getNodeParameter('name', i) as string;
						responseData = await sendGridApiRequest.call(this, '/marketing/lists', 'POST', { name }, qs);
						returnData.push(responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
			if (operation === 'delete') {
				for (let i = 0; i < length; i++) {
					try {
						const listId = this.getNodeParameter('listId', i) as string;
						qs.delete_contacts = this.getNodeParameter('deleteContacts', i) as boolean;
						responseData = await sendGridApiRequest.call(this, `/marketing/lists/${listId}`, 'DELETE', {}, qs);
						responseData = { success: true };
						returnData.push(responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
			if (operation === 'update') {
				for (let i = 0; i < length; i++) {
					try {
						const name = this.getNodeParameter('name', i) as string;
						const listId = this.getNodeParameter('listId', i) as string;
						responseData = await sendGridApiRequest.call(this, `/marketing/lists/${listId}`, 'PATCH', { name }, qs);
						returnData.push(responseData);
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
		}
		if (resource === 'mail') {
			if (operation === 'send') {
				for (let i = 0; i < length; i++) {
					try {
						const toEmail = this.getNodeParameter('toEmail', i) as string;

						const parsedToEmail = toEmail.includes(',')
							? toEmail.split(',').map((i) => ({ email: i.trim() }))
							: [{ email: toEmail.trim() }];

						const {
							bccEmail,
							ccEmail,
							enableSandbox,
							sendAt,
							headers,
							attachments,
							categories,
							ipPoolName,
						} = this.getNodeParameter('additionalFields', i) as {
							bccEmail: string;
							ccEmail: string;
							enableSandbox: boolean,
							sendAt: string;
							headers: { details: Array<{ key: string; value: string }> };
							attachments: string;
							categories: string;
							ipPoolName: string;
						};

						const body: SendMailBody = {
							personalizations: [{
								to: parsedToEmail,
							}],
							from: {
								email: (this.getNodeParameter('fromEmail', i) as string).trim(),
								name: this.getNodeParameter('fromName', i) as string,
							},
							mail_settings: {
								sandbox_mode: {
									enable: enableSandbox || false,
								},
							},
						};

						const dynamicTemplateEnabled = this.getNodeParameter('dynamicTemplate', i);

						// dynamic template
						if (dynamicTemplateEnabled) {
							body.template_id = this.getNodeParameter('templateId', i) as string;

							const { fields } = this.getNodeParameter('dynamicTemplateFields', i) as {
								fields: Array<{ [key: string]: string }>
							};

							if (fields) {
								body.personalizations[0].dynamic_template_data = {};
								fields.forEach(field => {
									body.personalizations[0].dynamic_template_data![field.key] = field.value;
								});
							}

							// message body
						} else {
							body.personalizations[0].subject = this.getNodeParameter('subject', i) as string;
							body.content = [{
								type: this.getNodeParameter('contentType', i) as string,
								value: this.getNodeParameter('contentValue', i) as string,
							}];
						}

						if (attachments) {
							const attachmentsToSend = [];
							const binaryProperties = attachments.split(',').map((p) => p.trim());

							for (const property of binaryProperties) {
								if (!items[i].binary?.hasOwnProperty(property)) {
									throw new NodeOperationError(this.getNode(), `The binary property ${property} does not exist`);
								}

								const binaryProperty = items[i].binary![property];

								const dataBuffer = await this.helpers.getBinaryDataBuffer(i, property);

								attachmentsToSend.push({
									content: dataBuffer.toString('base64'),
									filename: binaryProperty.fileName || 'unknown',
									type: binaryProperty.mimeType,
								});
							}

							if (attachmentsToSend.length) {
								body.attachments = attachmentsToSend;
							}
						}

						if (bccEmail) {
							body.personalizations[0].bcc = bccEmail.split(',').map(i => ({ email: i.trim() }));
						}

						if (ccEmail) {
							body.personalizations[0].cc = ccEmail.split(',').map(i => ({ email: i.trim() }));
						}

						if (headers?.details.length) {
							const parsedHeaders: { [key: string]: string } = {};
							headers.details.forEach(obj => parsedHeaders[obj['key']] = obj['value']);
							body.headers = parsedHeaders;
						}

						if (categories) {
							body.categories = categories.split(',') as string[];
						}

						if (ipPoolName) {
							body.ip_pool_name = ipPoolName as string;
						}

						if (sendAt) {
							body.personalizations[0].send_at = moment.tz(sendAt, timezone).unix();
						}

						const data = await sendGridApiRequest.call(this, '/mail/send', 'POST', body, qs, { resolveWithFullResponse: true });

						returnData.push({ messageId: data!.headers['x-message-id'] });
					} catch (error) {
						if (this.continueOnFail()) {
							returnData.push({ error: error.message });
							continue;
						}
						throw error;
					}
				}
			}
		}
		return [this.helpers.returnJsonArray(returnData)];
	}
}