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

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

import {
	googleApiRequest,
	googleApiRequestAllItems,
} from './GenericFunctions';

import {
	eventOperations,
	eventFields,
} from './EventDescription';

import {
	IEvent,
} from './EventInterface';

import * as moment from 'moment-timezone';

export class GoogleCalendar implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Google Calendar',
		name: 'googleCalendar',
		icon: 'file:googleCalendar.png',
		group: ['input'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Consume Google Calendar API.',
		defaults: {
			name: 'Google Calendar',
			color: '#3E87E4',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'googleOAuth2Api',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Event',
						value: 'event',
					},
				],
				default: 'event',
				description: 'The resource to operate on.',
			},
			...eventOperations,
			...eventFields,
		],
	};

	methods = {
		loadOptions: {
			// Get all the calendars to display them to user so that he can
			// select them easily
			async getCalendars(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const calendars = await googleApiRequestAllItems.call(this, 'items', 'GET', '/calendar/v3/users/me/calendarList');
				for (const calendar of calendars) {
					const calendarName = calendar.summary;
					const calendarId = calendar.id;
					returnData.push({
						name: calendarName,
						value: calendarId,
					});
				}
				return returnData;
			},
			// Get all the colors to display them to user so that he can
			// select them easily
			async getColors(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const { calendar } = await googleApiRequest.call(this, 'GET', '/calendar/v3/colors');
				for (const key of  Object.keys(calendar)) {
					const colorName = calendar[key].background;
					const colorId = key;
					returnData.push({
						name: `${colorName} - ${colorId}`,
						value: colorId,
					});
				}
				return returnData;
			},
			// Get all the timezones to display them to user so that he can
			// select them easily
			async getTimezones(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				for (const timezone of moment.tz.names()) {
					const timezoneName = timezone;
					const timezoneId = timezone;
					returnData.push({
						name: timezoneName,
						value: timezoneId,
					});
				}
				return returnData;
			},
		},
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: IDataObject[] = [];
		const length = items.length as unknown as number;
		const qs: IDataObject = {};
		let responseData;
		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;
		for (let i = 0; i < length; i++) {
			if (resource === 'event') {
				//https://developers.google.com/calendar/v3/reference/events/insert
				if (operation === 'create') {
					const calendarId = this.getNodeParameter('calendar', i) as string;
					const start = this.getNodeParameter('start', i) as string;
					const end = this.getNodeParameter('end', i) as string;
					const useDefaultReminders = this.getNodeParameter('useDefaultReminders', i) as boolean;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					if (additionalFields.maxAttendees) {
						qs.maxAttendees = additionalFields.maxAttendees as number;
					}
					if (additionalFields.sendNotifications) {
						qs.sendNotifications = additionalFields.sendNotifications as boolean;
					}
					if (additionalFields.sendUpdates) {
						qs.sendUpdates = additionalFields.sendUpdates as string;
					}
					const body: IEvent = {
						start: {
							dateTime: start,
							timeZone: additionalFields.timeZone || this.getTimezone(),
						},
						end: {
							dateTime: end,
							timeZone: additionalFields.timeZone || this.getTimezone(),
						}
					};
					if (additionalFields.attendees) {
						body.attendees = (additionalFields.attendees as string[]).map(attendee => {
							return { email: attendee };
						});
					}
					if (additionalFields.color) {
						body.colorId = additionalFields.color as string;
					}
					if (additionalFields.description) {
						body.description = additionalFields.description as string;
					}
					if (additionalFields.guestsCanInviteOthers) {
						body.guestsCanInviteOthers = additionalFields.guestsCanInviteOthers as boolean;
					}
					if (additionalFields.guestsCanModify) {
						body.guestsCanModify = additionalFields.guestsCanModify as boolean;
					}
					if (additionalFields.guestsCanSeeOtherGuests) {
						body.guestsCanSeeOtherGuests = additionalFields.guestsCanSeeOtherGuests as boolean;
					}
					if (additionalFields.id) {
						body.id = additionalFields.id as string;
					}
					if (additionalFields.location) {
						body.location = additionalFields.location as string;
					}
					if (additionalFields.summary) {
						body.summary = additionalFields.summary as string;
					}
					if (additionalFields.showMeAs) {
						body.transparency = additionalFields.showMeAs as string;
					}
					if (additionalFields.visibility) {
						body.visibility = additionalFields.visibility as string;
					}
					if (!useDefaultReminders) {
						const reminders = (this.getNodeParameter('remindersUi', i) as IDataObject).remindersValues as IDataObject[];
						body.reminders = {
							useDefault: false,
						};
						if (reminders) {
							body.reminders.overrides = reminders;
						}
					}
					if (additionalFields.allday) {
						body.start = {
							date: moment(start).utc().format('YYYY-MM-DD'),
						};
						body.end = {
							date: moment(end).utc().format('YYYY-MM-DD'),
						};
					}
					//exampel: RRULE:FREQ=WEEKLY;INTERVAL=2;COUNT=10;UNTIL=20110701T170000Z
					//https://icalendar.org/iCalendar-RFC-5545/3-8-5-3-recurrence-rule.html
					body.recurrence = [];
					if (additionalFields.repeatHowManyTimes
					&& additionalFields.repeatUntil) {
						throw new Error(`You can set either 'Repeat How Many Times' or 'Repeat Until' but not both`);
					}
					if (additionalFields.repeatFrecuency) {
						body.recurrence?.push(`FREQ=${(additionalFields.repeatFrecuency as string).toUpperCase()};`);
					}
					if (additionalFields.repeatHowManyTimes) {
						body.recurrence?.push(`COUNT=${additionalFields.repeatHowManyTimes};`);
					}
					if (additionalFields.repeatUntil) {
						body.recurrence?.push(`UNTIL=${moment(additionalFields.repeatUntil as string).utc().format('YYYYMMDDTHHmmss')}Z`);
					}
					if (body.recurrence.length !== 0) {
						body.recurrence = [`RRULE:${body.recurrence.join('')}`];
					}
					responseData = await googleApiRequest.call(this, 'POST', `/calendar/v3/calendars/${calendarId}/events`, body, qs);
				}
				//https://developers.google.com/calendar/v3/reference/events/delete
				if (operation === 'delete') {
					const calendarId = this.getNodeParameter('calendar', i) as string;
					const eventId = this.getNodeParameter('eventId', i) as string;
					const options = this.getNodeParameter('options', i) as IDataObject;
					if (options.sendUpdates) {
						qs.sendUpdates = options.sendUpdates as number;
					}
					responseData = await googleApiRequest.call(this, 'DELETE', `/calendar/v3/calendars/${calendarId}/events/${eventId}`, {});
					responseData = { success: true  };
				}
				//https://developers.google.com/calendar/v3/reference/events/get
				if (operation === 'get') {
					const calendarId = this.getNodeParameter('calendar', i) as string;
					const eventId = this.getNodeParameter('eventId', i) as string;
					const options = this.getNodeParameter('options', i) as IDataObject;
					if (options.maxAttendees) {
						qs.maxAttendees = options.maxAttendees as number;
					}
					if (options.timeZone) {
						qs.timeZone = options.timeZone as string;
					}
					responseData = await googleApiRequest.call(this, 'GET', `/calendar/v3/calendars/${calendarId}/events/${eventId}`, {}, qs);
				}
				//https://developers.google.com/calendar/v3/reference/events/list
				if (operation === 'getAll') {
					const returnAll = this.getNodeParameter('returnAll', i) as boolean;
					const calendarId = this.getNodeParameter('calendar', i) as string;
					const options = this.getNodeParameter('options', i) as IDataObject;
					if (options.iCalUID) {
						qs.iCalUID = options.iCalUID as string;
					}
					if (options.maxAttendees) {
						qs.maxAttendees = options.maxAttendees as number;
					}
					if (options.orderBy) {
						qs.orderBy = options.orderBy as number;
					}
					if (options.query) {
						qs.q = options.query as number;
					}
					if (options.showDeleted) {
						qs.showDeleted = options.showDeleted as boolean;
					}
					if (options.showHiddenInvitations) {
						qs.showHiddenInvitations = options.showHiddenInvitations as boolean;
					}
					if (options.singleEvents) {
						qs.singleEvents = options.singleEvents as boolean;
					}
					if (options.timeMax) {
						qs.timeMax = options.timeMax as string;
					}
					if (options.timeMin) {
						qs.timeMin = options.timeMin as string;
					}
					if (options.timeZone) {
						qs.timeZone = options.timeZone as string;
					}
					if (options.updatedMin) {
						qs.updatedMin = options.updatedMin as string;
					}
					if (returnAll) {
						responseData = await googleApiRequestAllItems.call(this, 'items', 'GET', `/calendar/v3/calendars/${calendarId}/events`, {}, qs);
					} else {
						qs.maxResults = this.getNodeParameter('limit', i) as number;
						responseData = await googleApiRequest.call(this, 'GET', `/calendar/v3/calendars/${calendarId}/events`, {}, qs);
						responseData = responseData.items;
					}
				}
				//https://developers.google.com/calendar/v3/reference/events/patch
				if (operation === 'update') {
					const calendarId = this.getNodeParameter('calendar', i) as string;
					const eventId = this.getNodeParameter('eventId', i) as string;
					const useDefaultReminders = this.getNodeParameter('useDefaultReminders', i) as boolean;
					const updateFields = this.getNodeParameter('updateFields', i) as IDataObject;
					if (updateFields.maxAttendees) {
						qs.maxAttendees = updateFields.maxAttendees as number;
					}
					if (updateFields.sendNotifications) {
						qs.sendNotifications = updateFields.sendNotifications as boolean;
					}
					if (updateFields.sendUpdates) {
						qs.sendUpdates = updateFields.sendUpdates as string;
					}
					const body: IEvent = {};
					if (updateFields.start) {
						body.start = {
							dateTime: updateFields.start,
							timeZone: updateFields.timeZone || this.getTimezone(),
						};
					}
					if (updateFields.end) {
						body.end = {
							dateTime: updateFields.end,
							timeZone: updateFields.timeZone || this.getTimezone(),
						};
					}
					if (updateFields.attendees) {
						body.attendees = (updateFields.attendees as string[]).map(attendee => {
							return { email: attendee };
						});
					}
					if (updateFields.color) {
						body.colorId = updateFields.color as string;
					}
					if (updateFields.description) {
						body.description = updateFields.description as string;
					}
					if (updateFields.guestsCanInviteOthers) {
						body.guestsCanInviteOthers = updateFields.guestsCanInviteOthers as boolean;
					}
					if (updateFields.guestsCanModify) {
						body.guestsCanModify = updateFields.guestsCanModify as boolean;
					}
					if (updateFields.guestsCanSeeOtherGuests) {
						body.guestsCanSeeOtherGuests = updateFields.guestsCanSeeOtherGuests as boolean;
					}
					if (updateFields.id) {
						body.id = updateFields.id as string;
					}
					if (updateFields.location) {
						body.location = updateFields.location as string;
					}
					if (updateFields.summary) {
						body.summary = updateFields.summary as string;
					}
					if (updateFields.showMeAs) {
						body.transparency = updateFields.showMeAs as string;
					}
					if (updateFields.visibility) {
						body.visibility = updateFields.visibility as string;
					}
					if (!useDefaultReminders) {
						const reminders = (this.getNodeParameter('remindersUi', i) as IDataObject).remindersValues as IDataObject[];
						body.reminders = {
							useDefault: false,
						};
						if (reminders) {
							body.reminders.overrides = reminders;
						}
					}
					if (updateFields.allday
					&&	updateFields.start
					&& updateFields.end) {
						body.start = {
							date: moment(updateFields.start as string).utc().format('YYYY-MM-DD'),
						};
						body.end = {
							date: moment(updateFields.end as string).utc().format('YYYY-MM-DD'),
						};
					}
					//exampel: RRULE:FREQ=WEEKLY;INTERVAL=2;COUNT=10;UNTIL=20110701T170000Z
					//https://icalendar.org/iCalendar-RFC-5545/3-8-5-3-recurrence-rule.html
					body.recurrence = [];
					if (updateFields.repeatHowManyTimes
					&& updateFields.repeatUntil) {
						throw new Error(`You can set either 'Repeat How Many Times' or 'Repeat Until' but not both`);
					}
					if (updateFields.repeatFrecuency) {
						body.recurrence?.push(`FREQ=${(updateFields.repeatFrecuency as string).toUpperCase()};`);
					}
					if (updateFields.repeatHowManyTimes) {
						body.recurrence?.push(`COUNT=${updateFields.repeatHowManyTimes};`);
					}
					if (updateFields.repeatUntil) {
						body.recurrence?.push(`UNTIL=${moment(updateFields.repeatUntil as string).utc().format('YYYYMMDDTHHmmss')}Z`);
					}
					if (body.recurrence.length !== 0) {
						body.recurrence = [`RRULE:${body.recurrence.join('')}`];
					} else {
						delete body.recurrence;
					}
					responseData = await googleApiRequest.call(this, 'PATCH', `/calendar/v3/calendars/${calendarId}/events/${eventId}`, body, qs);
				}
			}
		}
		if (Array.isArray(responseData)) {
			returnData.push.apply(returnData, responseData as IDataObject[]);
		} else if (responseData !== undefined) {
			returnData.push(responseData as IDataObject);
		}
		return [this.helpers.returnJsonArray(returnData)];
	}
}