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

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

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

import {
	messageFields,
	messageOperations,
} from './MessageDescription';

import {
	messageLabelFields,
	messageLabelOperations,
} from './MessageLabelDescription';

import {
	labelFields,
	labelOperations,
} from './LabelDescription';

import {
	draftFields,
	draftOperations,
} from './DraftDescription';

import {
	isEmpty,
} from 'lodash';

export interface IEmail {
	to?: string;
	cc?: string;
	bcc?: string;
	inReplyTo?: string;
	reference?: string;
	subject: string;
	body: string;
	attachments?: IDataObject[];
}

interface IAttachments {
	type: string;
	name: string;
	content: string;
}

export class Gmail implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Gmail',
		name: 'gmail',
		icon: 'file:gmail.png',
		group: ['transform'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Consume the Gmail API',
		defaults: {
			name: 'Gmail',
			color: '#d93025',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'gmailOAuth2',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Draft',
						value: 'draft',
					},
					{
						name: 'Label',
						value: 'label',
					},
					{
						name: 'Message',
						value: 'message',
					},
					{
						name: 'Message Label',
						value: 'messageLabel',
					},
				],
				default: 'draft',
				description: 'The resource to operate on.',
			},
			//-------------------------------
			// Draft Operations
			//-------------------------------
			...draftOperations,
			...draftFields,
			//-------------------------------
			// Label Operations
			//-------------------------------
			...labelOperations,
			...labelFields,
			//-------------------------------
			// Message Operations
			//-------------------------------
			...messageOperations,
			...messageFields,
			//-------------------------------
			// MessageLabel Operations
			//-------------------------------
			...messageLabelOperations,
			...messageLabelFields,
		],
	};

	methods = {
		loadOptions: {
			// Get all the labels to display them to user so that he can
			// select them easily
			async getLabels(
				this: ILoadOptionsFunctions
			): Promise<INodePropertyOptions[]> {
				const returnData: INodePropertyOptions[] = [];
				const labels = await googleApiRequestAllItems.call(
					this,
					'labels',
					'GET',
					'/gmail/v1/users/me/labels'
				);
				for (const label of labels) {
					const labelName = label.name;
					const labelId = label.id;
					returnData.push({
						name: labelName,
						value: labelId
					});
				}
				return returnData;
			},
		}
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: IDataObject[] = [];
		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;

		let method = '';
		let body: IDataObject = {};
		let qs: IDataObject = {};
		let endpoint = '';
		let responseData;

		for (let i = 0; i < items.length; i++) {
			if (resource === 'label') {
				if (operation === 'create') {
					//https://developers.google.com/gmail/api/v1/reference/users/labels/create
					const labelName = this.getNodeParameter('name', i) as string;
					const labelListVisibility = this.getNodeParameter('labelListVisibility', i) as string;
					const messageListVisibility = this.getNodeParameter('messageListVisibility', i) as string;

					method = 'POST';
					endpoint = '/gmail/v1/users/me/labels';

					body = {
						labelListVisibility,
						messageListVisibility,
						name: labelName,
					};

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
				if (operation === 'delete') {
					//https://developers.google.com/gmail/api/v1/reference/users/labels/delete
					const labelId = this.getNodeParameter('labelId', i) as string[];

					method = 'DELETE';
					endpoint = `/gmail/v1/users/me/labels/${labelId}`;
					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
					responseData = { success: true };

				}
				if (operation === 'get') {
					// https://developers.google.com/gmail/api/v1/reference/users/labels/get
					const labelId = this.getNodeParameter('labelId', i);

					method = 'GET';
					endpoint = `/gmail/v1/users/me/labels/${labelId}`;

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
				if (operation === 'getAll') {
					const returnAll = this.getNodeParameter('returnAll', i) as boolean;

					responseData = await googleApiRequest.call(
						this,
						'GET',
						`/gmail/v1/users/me/labels`,
						{},
						qs
					);

					responseData = responseData.labels;

					if (!returnAll) {
						const limit = this.getNodeParameter('limit', i) as number;
						responseData = responseData.splice(0, limit);
					}
				}
			}
			if (resource === 'messageLabel') {
				if (operation === 'remove') {
					//https://developers.google.com/gmail/api/v1/reference/users/messages/modify
					const messageID = this.getNodeParameter('messageId', i);
					const labelIds = this.getNodeParameter('labelIds', i) as string[];

					method = 'POST';
					endpoint = `/gmail/v1/users/me/messages/${messageID}/modify`;
					body = {
						removeLabelIds: labelIds,
					};
					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
				if (operation === 'add') {
					// https://developers.google.com/gmail/api/v1/reference/users/messages/modify
					const messageID = this.getNodeParameter('messageId', i);
					const labelIds = this.getNodeParameter('labelIds', i) as string[];

					method = 'POST';
					endpoint = `/gmail/v1/users/me/messages/${messageID}/modify`;

					body = {
						addLabelIds: labelIds,
					};

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
			}
			if (resource === 'message') {
				if (operation === 'send') {
					// https://developers.google.com/gmail/api/v1/reference/users/messages/send

					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;

					let toStr = '';
					let ccStr = '';
					let bccStr = '';
					let attachmentsList: IDataObject[] = [];

					const toList = this.getNodeParameter('toList', i) as IDataObject[];

					toList.forEach((email) => {
						toStr += `<${email}>, `;
					});

					if (additionalFields.ccList) {
						const ccList = additionalFields.ccList as IDataObject[];

						ccList.forEach((email) => {
							ccStr += `<${email}>, `;
						});
					}

					if (additionalFields.bccList) {
						const bccList = additionalFields.bccList as IDataObject[];

						bccList.forEach((email) => {
							bccStr += `<${email}>, `;
						});
					}

					if (additionalFields.attachmentsUi) {
						const attachmentsUi = additionalFields.attachmentsUi as IDataObject;
						let attachmentsBinary = [];
						if (!isEmpty(attachmentsUi)) {
							if (attachmentsUi.hasOwnProperty('attachmentsBinary')
								&& !isEmpty(attachmentsUi.attachmentsBinary)
								&& items[i].binary) {
								// @ts-ignore
								attachmentsBinary = attachmentsUi.attachmentsBinary.map((value) => {
									if (items[i].binary!.hasOwnProperty(value.property)) {
										const aux: IAttachments = { name: '', content: '', type: '' };
										aux.name = items[i].binary![value.property].fileName || 'unknown';
										aux.content = items[i].binary![value.property].data;
										aux.type = items[i].binary![value.property].mimeType;
										return aux;
									}
								});
							}

							qs = {
								userId: 'me',
								uploadType: 'media',
							};

							attachmentsList = attachmentsBinary;
						}
					}

					const email: IEmail = {
						to: toStr,
						cc: ccStr,
						bcc: bccStr,
						subject: this.getNodeParameter('subject', i) as string,
						body: this.getNodeParameter('message', i) as string,
						attachments: attachmentsList,
					};

					endpoint = '/gmail/v1/users/me/messages/send';
					method = 'POST';

					body = {
						raw: encodeEmail(email),
					};

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
				if (operation === 'reply') {

					const id = this.getNodeParameter('messageId', i) as string;

					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;

					let toStr = '';
					let ccStr = '';
					let bccStr = '';
					let attachmentsList: IDataObject[] = [];

					const toList = this.getNodeParameter('toList', i) as IDataObject[];

					toList.forEach((email) => {
						toStr += `<${email}>, `;
					});

					if (additionalFields.ccList) {
						const ccList = additionalFields.ccList as IDataObject[];

						ccList.forEach((email) => {
							ccStr += `<${email}>, `;
						});
					}

					if (additionalFields.bccList) {
						const bccList = additionalFields.bccList as IDataObject[];

						bccList.forEach((email) => {
							bccStr += `<${email}>, `;
						});
					}

					if (additionalFields.attachmentsUi) {
						const attachmentsUi = additionalFields.attachmentsUi as IDataObject;
						let attachmentsBinary = [];
						if (!isEmpty(attachmentsUi)) {
							if (attachmentsUi.hasOwnProperty('attachmentsBinary')
								&& !isEmpty(attachmentsUi.attachmentsBinary)
								&& items[i].binary) {
								// @ts-ignore
								attachmentsBinary = attachmentsUi.attachmentsBinary.map((value) => {
									if (items[i].binary!.hasOwnProperty(value.property)) {
										const aux: IAttachments = { name: '', content: '', type: '' };
										aux.name = items[i].binary![value.property].fileName || 'unknown';
										aux.content = items[i].binary![value.property].data;
										aux.type = items[i].binary![value.property].mimeType;
										return aux;
									}
								});
							}

							qs = {
								userId: 'me',
								uploadType: 'media',
							};

							attachmentsList = attachmentsBinary;
						}
					}

					// if no recipient is defined then grab the one who sent the email
					if (toStr === '') {
						endpoint = `/gmail/v1/users/me/messages/${id}`;

						qs.format = 'metadata';

						const { payload } = await googleApiRequest.call(this, method, endpoint, body, qs);

						for (const header of payload.headers as IDataObject[]) {
							if (header.name === 'From') {
								toStr = `<${extractEmail(header.value as string)}>,`;
								break;
							}
						}
					}

					const email: IEmail = {
						to: toStr,
						cc: ccStr,
						bcc: bccStr,
						subject: this.getNodeParameter('subject', i) as string,
						body: this.getNodeParameter('message', i) as string,
						attachments: attachmentsList,
					};

					endpoint = '/gmail/v1/users/me/messages/send';
					method = 'POST';

					email.inReplyTo = id;
					email.reference = id;

					body = {
						raw: encodeEmail(email),
						threadId: this.getNodeParameter('threadId', i) as string,
					};

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
				if (operation === 'get') {
					//https://developers.google.com/gmail/api/v1/reference/users/messages/get
					method = 'GET';

					const id = this.getNodeParameter('messageId', i);

					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					const format = additionalFields.format || 'resolved';

					if (format === 'resolved') {
						qs.format = 'raw';
					} else {
						qs.format = format;
					}

					endpoint = `/gmail/v1/users/me/messages/${id}`;

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);

					let nodeExecutionData: INodeExecutionData;
					if (format === 'resolved') {
						const messageEncoded = Buffer.from(responseData.raw, 'base64').toString('utf8');
						const dataPropertyNameDownload = additionalFields.dataPropertyAttachmentsPrefixName as string || 'attachment_';

						nodeExecutionData = await parseRawEmail.call(this, messageEncoded, dataPropertyNameDownload);
					} else  {
						nodeExecutionData = {
							json: responseData,
						};
					}

					responseData = nodeExecutionData;
				}
				if (operation === 'getAll') {
					const returnAll = this.getNodeParameter('returnAll', i) as boolean;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					Object.assign(qs, additionalFields);

					if (qs.labelIds) {
						// tslint:disable-next-line: triple-equals
						if (qs.labelIds == '') {
							delete qs.labelIds;
						} else {
							qs.labelIds = qs.labelIds as string[];
						}
					}

					if (returnAll) {
						responseData = await googleApiRequestAllItems.call(
							this,
							'messages',
							'GET',
							`/gmail/v1/users/me/messages`,
							{},
							qs
						);
					} else {
						qs.maxResults = this.getNodeParameter('limit', i) as number;
						responseData = await googleApiRequest.call(
							this,
							'GET',
							`/gmail/v1/users/me/messages`,
							{},
							qs
						);
						responseData = responseData.messages;
					}

					if (responseData === undefined) {
						responseData = [];
					}

					const format = additionalFields.format || 'resolved';

					if (format !== 'ids') {

						if (format === 'resolved') {
							qs.format = 'raw';
						} else {
							qs.format = format;
						}

						for (let i = 0; i < responseData.length; i++) {
							responseData[i] = await googleApiRequest.call(
								this,
								'GET',
								`/gmail/v1/users/me/messages/${responseData[i].id}`,
								body,
								qs
							);

							if (format === 'resolved') {
								const messageEncoded = Buffer.from(responseData[i].raw, 'base64').toString('utf8');
								const dataPropertyNameDownload = additionalFields.dataPropertyAttachmentsPrefixName as string || 'attachment_';
								responseData[i] = await parseRawEmail.call(this, messageEncoded, dataPropertyNameDownload);
							}
						}
					}

					if (format !== 'resolved') {
						responseData = this.helpers.returnJsonArray(responseData);
					}

				}
				if (operation === 'delete') {
					// https://developers.google.com/gmail/api/v1/reference/users/messages/delete
					method = 'DELETE';
					const id = this.getNodeParameter('messageId', i);

					endpoint = `/gmail/v1/users/me/messages/${id}`;

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);

					responseData = { success: true };
				}
			}
			if (resource === 'draft') {
				if (operation === 'create') {
					// https://developers.google.com/gmail/api/v1/reference/users/drafts/create

					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;

					let toStr = '';
					let ccStr = '';
					let bccStr = '';
					let attachmentsList: IDataObject[] = [];

					if (additionalFields.toList) {
						const toList = additionalFields.toList as IDataObject[];

						toList.forEach((email) => {
							toStr += `<${email}>, `;
						});
					}

					if (additionalFields.ccList) {
						const ccList = additionalFields.ccList as IDataObject[];

						ccList.forEach((email) => {
							ccStr += `<${email}>, `;
						});
					}

					if (additionalFields.bccList) {
						const bccList = additionalFields.bccList as IDataObject[];

						bccList.forEach((email) => {
							bccStr += `<${email}>, `;
						});
					}

					if (additionalFields.attachmentsUi) {
						const attachmentsUi = additionalFields.attachmentsUi as IDataObject;
						let attachmentsBinary = [];
						if (!isEmpty(attachmentsUi)) {
							if (attachmentsUi.hasOwnProperty('attachmentsBinary')
								&& !isEmpty(attachmentsUi.attachmentsBinary)
								&& items[i].binary) {
								// @ts-ignore
								attachmentsBinary = attachmentsUi.attachmentsBinary.map((value) => {
									if (items[i].binary!.hasOwnProperty(value.property)) {
										const aux: IAttachments = { name: '', content: '', type: '' };
										aux.name = items[i].binary![value.property].fileName || 'unknown';
										aux.content = items[i].binary![value.property].data;
										aux.type = items[i].binary![value.property].mimeType;
										return aux;
									}
								});
							}

							qs = {
								userId: 'me',
								uploadType: 'media',
							};

							attachmentsList = attachmentsBinary;
						}
					}

					const email: IEmail = {
						to: toStr,
						cc: ccStr,
						bcc: bccStr,
						subject: this.getNodeParameter('subject', i) as string,
						body: this.getNodeParameter('message', i) as string,
						attachments: attachmentsList,
					};

					endpoint = '/gmail/v1/users/me/drafts';
					method = 'POST';

					body = {
						message: {
							raw: encodeEmail(email),
						},
					};

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);
				}
				if (operation === 'get') {
					// https://developers.google.com/gmail/api/v1/reference/users/drafts/get
					method = 'GET';
					const id = this.getNodeParameter('messageId', i);

					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					const format = additionalFields.format || 'resolved';

					if (format === 'resolved') {
						qs.format = 'raw';
					} else {
						qs.format = format;
					}

					endpoint = `/gmail/v1/users/me/drafts/${id}`;

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);

					const binaryData: IBinaryKeyData = {};

					let nodeExecutionData: INodeExecutionData;
					if (format === 'resolved') {
						const messageEncoded = Buffer.from(responseData.message.raw, 'base64').toString('utf8');
						const dataPropertyNameDownload = additionalFields.dataPropertyAttachmentsPrefixName as string || 'attachment_';

						nodeExecutionData = await parseRawEmail.call(this, messageEncoded, dataPropertyNameDownload);
					} else {
						nodeExecutionData = {
							json: responseData,
							binary: Object.keys(binaryData).length ? binaryData : undefined,
						};
					}

					responseData = nodeExecutionData;
				}
				if (operation === 'delete') {
					// https://developers.google.com/gmail/api/v1/reference/users/drafts/delete
					method = 'DELETE';
					const id = this.getNodeParameter('messageId', i);

					endpoint = `/gmail/v1/users/me/drafts/${id}`;

					responseData = await googleApiRequest.call(this, method, endpoint, body, qs);

					responseData = { success: true };
				}
				if (operation === 'getAll') {
					const returnAll = this.getNodeParameter('returnAll', i) as boolean;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					Object.assign(qs, additionalFields);

					if (returnAll) {
						responseData = await googleApiRequestAllItems.call(
							this,
							'drafts',
							'GET',
							`/gmail/v1/users/me/drafts`,
							{},
							qs
						);
					} else {
						qs.maxResults = this.getNodeParameter('limit', i) as number;
						responseData = await googleApiRequest.call(
							this,
							'GET',
							`/gmail/v1/users/me/drafts`,
							{},
							qs
						);
						responseData = responseData.drafts;
					}

					if (responseData === undefined) {
						responseData = [];
					}

					const format = additionalFields.format || 'resolved';

					if (format !== 'ids') {
						if (format === 'resolved') {
							qs.format = 'raw';
						} else {
							qs.format = format;
						}

						for (let i = 0; i < responseData.length; i++) {

							responseData[i] = await googleApiRequest.call(
								this,
								'GET',
								`/gmail/v1/users/me/drafts/${responseData[i].id}`,
								body,
								qs
							);

							if (format === 'resolved') {
								const messageEncoded = Buffer.from(responseData[i].message.raw, 'base64').toString('utf8');
								const dataPropertyNameDownload = additionalFields.dataPropertyAttachmentsPrefixName as string || 'attachment_';
								responseData[i] = await parseRawEmail.call(this, messageEncoded, dataPropertyNameDownload);
							}
						}
					}

					if (format !== 'resolved') {
						responseData = this.helpers.returnJsonArray(responseData);
					}
				}
			}
			if (Array.isArray(responseData)) {
				returnData.push.apply(returnData, responseData as IDataObject[]);
			} else {
				returnData.push(responseData as IDataObject);
			}
		}
		if (['draft', 'message'].includes(resource) && ['get', 'getAll'].includes(operation)) {
			//@ts-ignore
			return this.prepareOutputData(returnData);
		}
		return [this.helpers.returnJsonArray(returnData)];
	}
}