import type {
	IExecuteFunctions,
	IDataObject,
	ILoadOptionsFunctions,
	INodeExecutionData,
	INodePropertyOptions,
	INodeType,
	INodeTypeDescription,
	JsonObject,
} from 'n8n-workflow';
import { NodeConnectionType, NodeApiError, NodeOperationError } from 'n8n-workflow';

import moment from 'moment-timezone';
import { v4 as uuid } from 'uuid';
import {
	addNextOccurrence,
	addTimezoneToDate,
	encodeURIComponentOnce,
	getCalendars,
	getTimezones,
	googleApiRequest,
	googleApiRequestAllItems,
} from './GenericFunctions';

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

import { calendarFields, calendarOperations } from './CalendarDescription';

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

export class GoogleCalendar implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Google Calendar',
		name: 'googleCalendar',
		icon: 'file:googleCalendar.svg',
		group: ['input'],
		version: [1, 1.1, 1.2],
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Consume Google Calendar API',
		defaults: {
			name: 'Google Calendar',
		},
		inputs: [NodeConnectionType.Main],
		outputs: [NodeConnectionType.Main],
		usableAsTool: true,
		credentials: [
			{
				name: 'googleCalendarOAuth2Api',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				noDataExpression: true,
				options: [
					{
						name: 'Calendar',
						value: 'calendar',
					},
					{
						name: 'Event',
						value: 'event',
					},
				],
				default: 'event',
			},
			...calendarOperations,
			...calendarFields,
			...eventOperations,
			...eventFields,
			{
				displayName:
					'This node will use the time zone set in n8n’s settings, but you can override this in the workflow settings',
				name: 'useN8nTimeZone',
				type: 'notice',
				default: '',
			},
		],
	};

	methods = {
		listSearch: {
			getCalendars,
			getTimezones,
		},
		loadOptions: {
			// Get all the calendars to display them to user so that they can
			// select them easily
			async getConferenceSolutions(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const calendar = this.getCurrentNodeParameter('calendar', { extractValue: true }) as string;
				const possibleSolutions: IDataObject = {
					eventHangout: 'Google Hangout',
					eventNamedHangout: 'Google Hangout Classic',
					hangoutsMeet: 'Google Meet',
				};
				const {
					conferenceProperties: { allowedConferenceSolutionTypes },
				} = await googleApiRequest.call(
					this,
					'GET',
					`/calendar/v3/users/me/calendarList/${calendar}`,
				);
				for (const solution of allowedConferenceSolutionTypes) {
					returnData.push({
						name: possibleSolutions[solution] as string,
						value: solution,
					});
				}
				return returnData;
			},
			// Get all the colors to display them to user so that they can
			// select them easily
			async getColors(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const { event } = await googleApiRequest.call(this, 'GET', '/calendar/v3/colors');
				for (const key of Object.keys(event as IDataObject)) {
					const colorName = `Background: ${event[key].background} - Foreground: ${event[key].foreground}`;
					const colorId = key;
					returnData.push({
						name: `${colorName}`,
						value: colorId,
					});
				}
				return returnData;
			},
		},
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: INodeExecutionData[] = [];
		const length = items.length;
		const qs: IDataObject = {};
		let responseData;

		const resource = this.getNodeParameter('resource', 0);
		const operation = this.getNodeParameter('operation', 0);
		const timezone = this.getTimezone();
		const nodeVersion = this.getNode().typeVersion;

		for (let i = 0; i < length; i++) {
			try {
				if (resource === 'calendar') {
					//https://developers.google.com/calendar/v3/reference/freebusy/query
					if (operation === 'availability') {
						// we need to decode once because calendar used to be saved encoded
						const calendarId = decodeURIComponent(
							this.getNodeParameter('calendar', i, '', { extractValue: true }) as string,
						);
						const timeMin = this.getNodeParameter('timeMin', i) as string;
						const timeMax = this.getNodeParameter('timeMax', i) as string;
						const options = this.getNodeParameter('options', i);
						const outputFormat = options.outputFormat || 'availability';
						const tz = this.getNodeParameter('options.timezone', i, '', {
							extractValue: true,
						}) as string;

						const body: IDataObject = {
							timeMin: moment(timeMin).utc().format(),
							timeMax: moment(timeMax).utc().format(),
							items: [
								{
									id: calendarId,
								},
							],
							timeZone: tz || timezone,
						};

						responseData = await googleApiRequest.call(
							this,
							'POST',
							'/calendar/v3/freeBusy',
							body,
							{},
						);

						if (responseData.calendars[calendarId].errors) {
							throw new NodeApiError(
								this.getNode(),
								responseData.calendars[calendarId] as JsonObject,
								{
									itemIndex: i,
								},
							);
						}

						if (outputFormat === 'availability') {
							responseData = {
								available: !responseData.calendars[calendarId].busy.length,
							};
						} else if (outputFormat === 'bookedSlots') {
							responseData = responseData.calendars[calendarId].busy;
						}
					}
				}
				if (resource === 'event') {
					//https://developers.google.com/calendar/v3/reference/events/insert
					if (operation === 'create') {
						const calendarId = encodeURIComponentOnce(
							this.getNodeParameter('calendar', i, '', { extractValue: true }) 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);

						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: moment.tz(start, timezone).utc().format(),
								timeZone: timezone,
							},
							end: {
								dateTime: moment.tz(end, timezone).utc().format(),
								timeZone: timezone,
							},
						};
						if (additionalFields.attendees) {
							body.attendees = [];
							(additionalFields.attendees as string[]).forEach((attendee) => {
								body.attendees!.push.apply(
									body.attendees,
									attendee
										.split(',')
										.map((a) => a.trim())
										.map((email) => ({ email })),
								);
							});
						}
						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 === 'yes') {
							body.start = {
								date: timezone
									? moment.tz(start, timezone).utc(true).format('YYYY-MM-DD')
									: moment.tz(start, moment.tz.guess()).utc(true).format('YYYY-MM-DD'),
							};
							body.end = {
								date: timezone
									? moment.tz(end, timezone).utc(true).format('YYYY-MM-DD')
									: moment.tz(end, moment.tz.guess()).utc(true).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.rrule) {
							body.recurrence = [`RRULE:${additionalFields.rrule}`];
						} else {
							if (additionalFields.repeatHowManyTimes && additionalFields.repeatUntil) {
								throw new NodeOperationError(
									this.getNode(),
									"You can set either 'Repeat How Many Times' or 'Repeat Until' but not both",
									{ itemIndex: i },
								);
							}
							if (additionalFields.repeatFrecuency) {
								body.recurrence?.push(
									`FREQ=${(additionalFields.repeatFrecuency as string).toUpperCase()};`,
								);
							}
							if (additionalFields.repeatHowManyTimes) {
								body.recurrence?.push(`COUNT=${additionalFields.repeatHowManyTimes};`);
							}
							if (additionalFields.repeatUntil) {
								const repeatUntil = moment(additionalFields.repeatUntil as string)
									.utc()
									.format('YYYYMMDDTHHmmss');
								body.recurrence?.push(`UNTIL=${repeatUntil}Z`);
							}
							if (body.recurrence.length !== 0) {
								body.recurrence = [`RRULE:${body.recurrence.join('')}`];
							}
						}

						if (additionalFields.conferenceDataUi) {
							const conferenceData = (additionalFields.conferenceDataUi as IDataObject)
								.conferenceDataValues as IDataObject;
							if (conferenceData) {
								qs.conferenceDataVersion = 1;
								body.conferenceData = {
									createRequest: {
										requestId: uuid(),
										conferenceSolution: {
											type: conferenceData.conferenceSolution as string,
										},
									},
								};
							}
						}
						responseData = await googleApiRequest.call(
							this,
							'POST',
							`/calendar/v3/calendars/${calendarId}/events`,
							body,
							qs,
						);
					}
					//https://developers.google.com/calendar/v3/reference/events/delete
					if (operation === 'delete') {
						const calendarId = encodeURIComponentOnce(
							this.getNodeParameter('calendar', i, '', { extractValue: true }) as string,
						);
						const eventId = this.getNodeParameter('eventId', i) as string;
						const options = this.getNodeParameter('options', i);
						if (options.sendUpdates) {
							qs.sendUpdates = options.sendUpdates as number;
						}
						responseData = await googleApiRequest.call(
							this,
							'DELETE',
							`/calendar/v3/calendars/${calendarId}/events/${eventId}`,
							{},
						);
						responseData = { success: true };
					}
					//https://developers.google.com/calendar/v3/reference/events/get
					if (operation === 'get') {
						const calendarId = encodeURIComponentOnce(
							this.getNodeParameter('calendar', i, '', { extractValue: true }) as string,
						);
						const eventId = this.getNodeParameter('eventId', i) as string;
						const options = this.getNodeParameter('options', i);
						const tz = this.getNodeParameter('options.timeZone', i, '', {
							extractValue: true,
						}) as string;
						if (options.maxAttendees) {
							qs.maxAttendees = options.maxAttendees as number;
						}
						if (tz) {
							qs.timeZone = tz;
						}
						responseData = await googleApiRequest.call(
							this,
							'GET',
							`/calendar/v3/calendars/${calendarId}/events/${eventId}`,
							{},
							qs,
						);

						if (responseData) {
							responseData = addNextOccurrence([responseData]);
						}
					}
					//https://developers.google.com/calendar/v3/reference/events/list
					if (operation === 'getAll') {
						const returnAll = this.getNodeParameter('returnAll', i);
						const calendarId = encodeURIComponentOnce(
							this.getNodeParameter('calendar', i, '', { extractValue: true }) as string,
						);
						const options = this.getNodeParameter('options', i);
						const tz = this.getNodeParameter('options.timeZone', i, '', {
							extractValue: true,
						}) as string;
						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 = addTimezoneToDate(options.timeMax as string, tz || timezone);
						}
						if (options.timeMin) {
							qs.timeMin = addTimezoneToDate(options.timeMin as string, tz || timezone);
						}
						if (tz) {
							qs.timeZone = tz;
						}
						if (options.updatedMin) {
							qs.updatedMin = addTimezoneToDate(options.updatedMin as string, tz || timezone);
						}
						if (options.fields) {
							qs.fields = options.fields as string;
						}

						if (returnAll) {
							responseData = await googleApiRequestAllItems.call(
								this,
								'items',
								'GET',
								`/calendar/v3/calendars/${calendarId}/events`,
								{},
								qs,
							);
						} else {
							qs.maxResults = this.getNodeParameter('limit', i);
							responseData = await googleApiRequest.call(
								this,
								'GET',
								`/calendar/v3/calendars/${calendarId}/events`,
								{},
								qs,
							);
							responseData = responseData.items;
						}

						if (responseData) {
							responseData = addNextOccurrence(responseData);
						}
					}
					//https://developers.google.com/calendar/v3/reference/events/patch
					if (operation === 'update') {
						const calendarId = encodeURIComponentOnce(
							this.getNodeParameter('calendar', i, '', { extractValue: true }) as string,
						);
						const eventId = this.getNodeParameter('eventId', i) as string;
						const useDefaultReminders = this.getNodeParameter('useDefaultReminders', i) as boolean;
						const updateFields = this.getNodeParameter('updateFields', i);
						let updateTimezone = updateFields.timezone as string;

						if (nodeVersion > 1 && updateTimezone === undefined) {
							updateTimezone = timezone;
						}

						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: moment.tz(updateFields.start, updateTimezone).utc().format(),
								timeZone: updateTimezone,
							};
						}
						if (updateFields.end) {
							body.end = {
								dateTime: moment.tz(updateFields.end, updateTimezone).utc().format(),
								timeZone: updateTimezone,
							};
						}
						// nodeVersion < 1.2
						if (updateFields.attendees) {
							body.attendees = [];
							(updateFields.attendees as string[]).forEach((attendee) => {
								body.attendees!.push.apply(
									body.attendees,
									attendee
										.split(',')
										.map((a) => a.trim())
										.map((email) => ({ email })),
								);
							});
						}
						// nodeVersion >= 1.2
						if (updateFields.attendeesUi) {
							const { mode, attendees } = (
								updateFields.attendeesUi as {
									values: {
										mode: string;
										attendees: string[];
									};
								}
							).values;
							body.attendees = [];
							if (mode === 'add') {
								const event = await googleApiRequest.call(
									this,
									'GET',
									`/calendar/v3/calendars/${calendarId}/events/${eventId}`,
								);
								((event?.attendees as IDataObject[]) || []).forEach((attendee) => {
									body.attendees?.push(attendee);
								});
							}
							(attendees as string[]).forEach((attendee) => {
								body.attendees!.push.apply(
									body.attendees,
									attendee
										.split(',')
										.map((a) => a.trim())
										.map((email) => ({ email })),
								);
							});
						}
						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 === 'yes' && updateFields.start && updateFields.end) {
							body.start = {
								date: updateTimezone
									? moment.tz(updateFields.start, updateTimezone).utc(true).format('YYYY-MM-DD')
									: moment.tz(updateFields.start, moment.tz.guess()).utc(true).format('YYYY-MM-DD'),
							};
							body.end = {
								date: updateTimezone
									? moment.tz(updateFields.end, updateTimezone).utc(true).format('YYYY-MM-DD')
									: moment.tz(updateFields.end, moment.tz.guess()).utc(true).format('YYYY-MM-DD'),
							};
						}
						//example: 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.rrule) {
							body.recurrence = [`RRULE:${updateFields.rrule}`];
						} else {
							if (updateFields.repeatHowManyTimes && updateFields.repeatUntil) {
								throw new NodeOperationError(
									this.getNode(),
									"You can set either 'Repeat How Many Times' or 'Repeat Until' but not both",
									{ itemIndex: i },
								);
							}
							if (updateFields.repeatFrecuency) {
								body.recurrence?.push(
									`FREQ=${(updateFields.repeatFrecuency as string).toUpperCase()};`,
								);
							}
							if (updateFields.repeatHowManyTimes) {
								body.recurrence?.push(`COUNT=${updateFields.repeatHowManyTimes};`);
							}
							if (updateFields.repeatUntil) {
								const repeatUntil = moment(updateFields.repeatUntil as string)
									.utc()
									.format('YYYYMMDDTHHmmss');

								body.recurrence?.push(`UNTIL=${repeatUntil}Z`);
							}
							if (body.recurrence.length !== 0) {
								body.recurrence = [`RRULE:${body.recurrence.join('')}`];
							} else {
								delete body.recurrence;
							}
						}
						responseData = await googleApiRequest.call(
							this,
							'PATCH',
							`/calendar/v3/calendars/${calendarId}/events/${eventId}`,
							body,
							qs,
						);
					}
				}

				const executionData = this.helpers.constructExecutionMetaData(
					this.helpers.returnJsonArray(responseData as IDataObject),
					{ itemData: { item: i } },
				);
				returnData.push(...executionData);
			} catch (error) {
				if (!this.continueOnFail()) {
					throw error;
				} else {
					const executionErrorData = this.helpers.constructExecutionMetaData(
						this.helpers.returnJsonArray({ error: error.message }),
						{ itemData: { item: i } },
					);
					returnData.push(...executionErrorData);
					continue;
				}
			}
		}
		return [returnData];
	}
}