import { IExecuteFunctions } from 'n8n-core';
import {
	GenericValue,
	ICredentialDataDecryptedObject,
	ICredentialsDecrypted,
	ICredentialTestFunctions,
	IDataObject,
	INodeCredentialTestResult,
	INodeExecutionData,
	INodeType,
	INodeTypeDescription,
	NodeOperationError,
} from 'n8n-workflow';

import { set } from 'lodash';
import redis from 'redis';

import util from 'util';

export class Redis implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Redis',
		name: 'redis',
		icon: 'file:redis.svg',
		group: ['input'],
		version: 1,
		description: 'Get, send and update data in Redis',
		defaults: {
			name: 'Redis',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'redis',
				required: true,
				testedBy: 'redisConnectionTest',
			},
		],
		properties: [
			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				noDataExpression: true,
				options: [
					{
						name: 'Delete',
						value: 'delete',
						description: 'Delete a key from Redis',
						action: 'Delete a key from Redis',
					},
					{
						name: 'Get',
						value: 'get',
						description: 'Get the value of a key from Redis',
						action: 'Get the value of a key from Redis',
					},
					{
						name: 'Increment',
						value: 'incr',
						description: 'Atomically increments a key by 1. Creates the key if it does not exist.',
						action: 'Atomically increment a key by 1. Creates the key if it does not exist.',
					},
					{
						name: 'Info',
						value: 'info',
						description: 'Returns generic information about the Redis instance',
						action: 'Return generic information about the Redis instance',
					},
					{
						name: 'Keys',
						value: 'keys',
						description: 'Returns all the keys matching a pattern',
						action: 'Return all keys matching a pattern',
					},
					{
						name: 'Pop',
						value: 'pop',
						description: 'Pop data from a redis list',
						action: 'Pop data from a redis list',
					},
					{
						name: 'Publish',
						value: 'publish',
						description: 'Publish message to redis channel',
						action: 'Publish message to redis channel',
					},
					{
						name: 'Push',
						value: 'push',
						description: 'Push data to a redis list',
						action: 'Push data to a redis list',
					},
					{
						name: 'Set',
						value: 'set',
						description: 'Set the value of a key in redis',
						action: 'Set the value of a key in redis',
					},
				],
				default: 'info',
			},

			// ----------------------------------
			//         get
			// ----------------------------------
			{
				displayName: 'Name',
				name: 'propertyName',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['get'],
					},
				},
				default: 'propertyName',
				required: true,
				description:
					'Name of the property to write received data to. Supports dot-notation. Example: "data.person[0].name".',
			},
			{
				displayName: 'Key',
				name: 'key',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['delete'],
					},
				},
				default: '',
				required: true,
				description: 'Name of the key to delete from Redis',
			},
			{
				displayName: 'Key',
				name: 'key',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['get'],
					},
				},
				default: '',
				required: true,
				description: 'Name of the key to get from Redis',
			},
			{
				displayName: 'Key Type',
				name: 'keyType',
				type: 'options',
				displayOptions: {
					show: {
						operation: ['get'],
					},
				},
				options: [
					{
						name: 'Automatic',
						value: 'automatic',
						description: 'Requests the type before requesting the data (slower)',
					},
					{
						name: 'Hash',
						value: 'hash',
						description: "Data in key is of type 'hash'",
					},
					{
						name: 'List',
						value: 'list',
						description: "Data in key is of type 'lists'",
					},
					{
						name: 'Sets',
						value: 'sets',
						description: "Data in key is of type 'sets'",
					},
					{
						name: 'String',
						value: 'string',
						description: "Data in key is of type 'string'",
					},
				],
				default: 'automatic',
				description: 'The type of the key to get',
			},

			{
				displayName: 'Options',
				name: 'options',
				type: 'collection',
				displayOptions: {
					show: {
						operation: ['get'],
					},
				},
				placeholder: 'Add Option',
				default: {},
				options: [
					{
						displayName: 'Dot Notation',
						name: 'dotNotation',
						type: 'boolean',
						default: true,
						// eslint-disable-next-line n8n-nodes-base/node-param-description-boolean-without-whether
						description:
							'<p>By default, dot-notation is used in property names. This means that "a.b" will set the property "b" underneath "a" so { "a": { "b": value} }.<p></p>If that is not intended this can be deactivated, it will then set { "a.b": value } instead.</p>.',
					},
				],
			},

			// ----------------------------------
			//         incr
			// ----------------------------------
			{
				displayName: 'Key',
				name: 'key',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['incr'],
					},
				},
				default: '',
				required: true,
				description: 'Name of the key to increment',
			},
			{
				displayName: 'Expire',
				name: 'expire',
				type: 'boolean',
				displayOptions: {
					show: {
						operation: ['incr'],
					},
				},
				default: false,
				description: 'Whether to set a timeout on key',
			},
			{
				displayName: 'TTL',
				name: 'ttl',
				type: 'number',
				typeOptions: {
					minValue: 1,
				},
				displayOptions: {
					show: {
						operation: ['incr'],
						expire: [true],
					},
				},
				default: 60,
				description: 'Number of seconds before key expiration',
			},

			// ----------------------------------
			//         keys
			// ----------------------------------
			{
				displayName: 'Key Pattern',
				name: 'keyPattern',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['keys'],
					},
				},
				default: '',
				required: true,
				description: 'The key pattern for the keys to return',
			},
			{
				displayName: 'Get Values',
				name: 'getValues',
				type: 'boolean',
				displayOptions: {
					show: {
						operation: ['keys'],
					},
				},
				default: true,
				description: 'Whether to get the value of matching keys',
			},
			// ----------------------------------
			//         set
			// ----------------------------------
			{
				displayName: 'Key',
				name: 'key',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['set'],
					},
				},
				default: '',
				required: true,
				description: 'Name of the key to set in Redis',
			},
			{
				displayName: 'Value',
				name: 'value',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['set'],
					},
				},
				default: '',
				description: 'The value to write in Redis',
			},
			{
				displayName: 'Key Type',
				name: 'keyType',
				type: 'options',
				displayOptions: {
					show: {
						operation: ['set'],
					},
				},
				options: [
					{
						name: 'Automatic',
						value: 'automatic',
						description: 'Tries to figure out the type automatically depending on the data',
					},
					{
						name: 'Hash',
						value: 'hash',
						description: "Data in key is of type 'hash'",
					},
					{
						name: 'List',
						value: 'list',
						description: "Data in key is of type 'lists'",
					},
					{
						name: 'Sets',
						value: 'sets',
						description: "Data in key is of type 'sets'",
					},
					{
						name: 'String',
						value: 'string',
						description: "Data in key is of type 'string'",
					},
				],
				default: 'automatic',
				description: 'The type of the key to set',
			},

			{
				displayName: 'Expire',
				name: 'expire',
				type: 'boolean',
				displayOptions: {
					show: {
						operation: ['set'],
					},
				},
				default: false,
				description: 'Whether to set a timeout on key',
			},

			{
				displayName: 'TTL',
				name: 'ttl',
				type: 'number',
				typeOptions: {
					minValue: 1,
				},
				displayOptions: {
					show: {
						operation: ['set'],
						expire: [true],
					},
				},
				default: 60,
				description: 'Number of seconds before key expiration',
			},
			// ----------------------------------
			//         publish
			// ----------------------------------
			{
				displayName: 'Channel',
				name: 'channel',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['publish'],
					},
				},
				default: '',
				required: true,
				description: 'Channel name',
			},
			{
				displayName: 'Data',
				name: 'messageData',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['publish'],
					},
				},
				typeOptions: {
					alwaysOpenEditWindow: true,
				},
				default: '',
				required: true,
				description: 'Data to publish',
			},
			// ----------------------------------
			//         push/pop
			// ----------------------------------
			{
				displayName: 'List',
				name: 'list',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['push', 'pop'],
					},
				},
				default: '',
				required: true,
				description: 'Name of the list in Redis',
			},
			{
				displayName: 'Data',
				name: 'messageData',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['push'],
					},
				},
				typeOptions: {
					alwaysOpenEditWindow: true,
				},
				default: '',
				required: true,
				description: 'Data to push',
			},
			{
				displayName: 'Tail',
				name: 'tail',
				type: 'boolean',
				displayOptions: {
					show: {
						operation: ['push', 'pop'],
					},
				},
				default: false,
				description: 'Whether to push or pop data from the end of the list',
			},
			{
				displayName: 'Name',
				name: 'propertyName',
				type: 'string',
				displayOptions: {
					show: {
						operation: ['pop'],
					},
				},
				default: 'propertyName',
				description:
					'Optional name of the property to write received data to. Supports dot-notation. Example: "data.person[0].name".',
			},
			{
				displayName: 'Options',
				name: 'options',
				type: 'collection',
				displayOptions: {
					show: {
						operation: ['pop'],
					},
				},
				placeholder: 'Add Option',
				default: {},
				options: [
					{
						displayName: 'Dot Notation',
						name: 'dotNotation',
						type: 'boolean',
						default: true,
						// eslint-disable-next-line n8n-nodes-base/node-param-description-boolean-without-whether
						description:
							'<p>By default, dot-notation is used in property names. This means that "a.b" will set the property "b" underneath "a" so { "a": { "b": value} }.<p></p>If that is not intended this can be deactivated, it will then set { "a.b": value } instead.</p>.',
					},
				],
			},
		],
	};

	methods = {
		credentialTest: {
			async redisConnectionTest(
				this: ICredentialTestFunctions,
				credential: ICredentialsDecrypted,
			): Promise<INodeCredentialTestResult> {
				const credentials = credential.data as ICredentialDataDecryptedObject;
				const redisOptions: redis.ClientOpts = {
					host: credentials.host as string,
					port: credentials.port as number,
					db: credentials.database as number,
				};

				if (credentials.password) {
					redisOptions.password = credentials.password as string;
				}
				try {
					const client = redis.createClient(redisOptions);
					// tslint:disable-next-line: no-any

					const _data = await new Promise((resolve, reject): any => {
						client.on('connect', async () => {
							client.ping('ping', (error, pong) => {
								if (error) reject(error);
								resolve(pong);
								client.quit();
							});
						});
						client.on('error', async (err) => {
							client.quit();
							reject(err);
						});
					});
				} catch (error) {
					return {
						status: 'Error',
						message: error.message,
					};
				}
				return {
					status: 'OK',
					message: 'Connection successful!',
				};
			},
		},
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		// Parses the given value in a number if it is one else returns a string
		function getParsedValue(value: string): string | number {
			if (value.match(/^[\d\.]+$/) === null) {
				// Is a string
				return value;
			} else {
				// Is a number
				return parseFloat(value);
			}
		}

		// Converts the Redis Info String into an object
		function convertInfoToObject(stringData: string): IDataObject {
			const returnData: IDataObject = {};

			let key: string, value: string;
			for (const line of stringData.split('\n')) {
				if (['#', ''].includes(line.charAt(0))) {
					continue;
				}
				[key, value] = line.split(':');
				if (key === undefined || value === undefined) {
					continue;
				}
				value = value.trim();

				if (value.includes('=')) {
					returnData[key] = {};
					let key2: string, value2: string;
					for (const keyValuePair of value.split(',')) {
						[key2, value2] = keyValuePair.split('=');
						(returnData[key] as IDataObject)[key2] = getParsedValue(value2);
					}
				} else {
					returnData[key] = getParsedValue(value);
				}
			}

			return returnData;
		}

		async function getValue(client: redis.RedisClient, keyName: string, type?: string) {
			if (type === undefined || type === 'automatic') {
				// Request the type first
				const clientType = util.promisify(client.type).bind(client);
				type = await clientType(keyName);
			}

			if (type === 'string') {
				const clientGet = util.promisify(client.get).bind(client);
				return clientGet(keyName);
			} else if (type === 'hash') {
				const clientHGetAll = util.promisify(client.hgetall).bind(client);
				return clientHGetAll(keyName);
			} else if (type === 'list') {
				const clientLRange = util.promisify(client.lrange).bind(client);
				return clientLRange(keyName, 0, -1);
			} else if (type === 'sets') {
				const clientSMembers = util.promisify(client.smembers).bind(client);
				return clientSMembers(keyName);
			}
		}

		const setValue = async (
			client: redis.RedisClient,
			keyName: string,
			value: string | number | object | string[] | number[],
			expire: boolean,
			ttl: number,
			type?: string,
		) => {
			if (type === undefined || type === 'automatic') {
				// Request the type first
				if (typeof value === 'string') {
					type = 'string';
				} else if (Array.isArray(value)) {
					type = 'list';
				} else if (typeof value === 'object') {
					type = 'hash';
				} else {
					throw new NodeOperationError(
						this.getNode(),
						'Could not identify the type to set. Please set it manually!',
					);
				}
			}

			if (type === 'string') {
				const clientSet = util.promisify(client.set).bind(client);
				await clientSet(keyName, value.toString());
			} else if (type === 'hash') {
				const clientHset = util.promisify(client.hset).bind(client);
				for (const key of Object.keys(value)) {
					// @ts-ignore
					await clientHset(keyName, key, (value as IDataObject)[key]!.toString());
				}
			} else if (type === 'list') {
				const clientLset = util.promisify(client.lset).bind(client);
				for (let index = 0; index < (value as string[]).length; index++) {
					await clientLset(keyName, index, (value as IDataObject)[index]!.toString());
				}
			}

			if (expire) {
				const clientExpire = util.promisify(client.expire).bind(client);
				await clientExpire(keyName, ttl);
			}
			return;
		};

		return new Promise(async (resolve, reject) => {
			// TODO: For array and object fields it should not have a "value" field it should
			//       have a parameter field for a path. Because it is not possible to set
			//       array, object via parameter directly (should maybe be possible?!?!)
			//       Should maybe have a parameter which is JSON.
			const credentials = await this.getCredentials('redis');

			const redisOptions: redis.ClientOpts = {
				host: credentials.host as string,
				port: credentials.port as number,
				db: credentials.database as number,
			};

			if (credentials.password) {
				redisOptions.password = credentials.password as string;
			}

			const client = redis.createClient(redisOptions);

			const operation = this.getNodeParameter('operation', 0);

			client.on('error', (err: Error) => {
				client.quit();
				reject(err);
			});

			client.on('ready', async (_err: Error | null) => {
				client.select(credentials.database as number);
				try {
					if (operation === 'info') {
						const clientInfo = util.promisify(client.info).bind(client);
						const result = await clientInfo();

						resolve(this.prepareOutputData([{ json: convertInfoToObject(result as string) }]));
						client.quit();
					} else if (
						['delete', 'get', 'keys', 'set', 'incr', 'publish', 'push', 'pop'].includes(operation)
					) {
						const items = this.getInputData();
						const returnItems: INodeExecutionData[] = [];

						let item: INodeExecutionData;
						for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
							item = { json: {} };

							if (operation === 'delete') {
								const keyDelete = this.getNodeParameter('key', itemIndex) as string;

								const clientDel = util.promisify(client.del).bind(client);
								// @ts-ignore
								await clientDel(keyDelete);
								returnItems.push(items[itemIndex]);
							} else if (operation === 'get') {
								const propertyName = this.getNodeParameter('propertyName', itemIndex) as string;
								const keyGet = this.getNodeParameter('key', itemIndex) as string;
								const keyType = this.getNodeParameter('keyType', itemIndex) as string;

								const value = (await getValue(client, keyGet, keyType)) || null;

								const options = this.getNodeParameter('options', itemIndex, {});

								if (options.dotNotation === false) {
									item.json[propertyName] = value;
								} else {
									set(item.json, propertyName, value);
								}

								returnItems.push(item);
							} else if (operation === 'keys') {
								const keyPattern = this.getNodeParameter('keyPattern', itemIndex) as string;
								const getValues = this.getNodeParameter('getValues', itemIndex, true) as boolean;

								const clientKeys = util.promisify(client.keys).bind(client);
								const keys = await clientKeys(keyPattern);

								if (!getValues) {
									returnItems.push({ json: { keys } });
									continue;
								}

								const promises: {
									[key: string]: GenericValue;
								} = {};

								for (const keyName of keys) {
									promises[keyName] = await getValue(client, keyName);
								}

								for (const keyName of keys) {
									// eslint-disable-next-line @typescript-eslint/await-thenable
									item.json[keyName] = await promises[keyName];
								}
								returnItems.push(item);
							} else if (operation === 'set') {
								const keySet = this.getNodeParameter('key', itemIndex) as string;
								const value = this.getNodeParameter('value', itemIndex) as string;
								const keyType = this.getNodeParameter('keyType', itemIndex) as string;
								const expire = this.getNodeParameter('expire', itemIndex, false) as boolean;
								const ttl = this.getNodeParameter('ttl', itemIndex, -1) as number;

								await setValue(client, keySet, value, expire, ttl, keyType);
								returnItems.push(items[itemIndex]);
							} else if (operation === 'incr') {
								const keyIncr = this.getNodeParameter('key', itemIndex) as string;
								const expire = this.getNodeParameter('expire', itemIndex, false) as boolean;
								const ttl = this.getNodeParameter('ttl', itemIndex, -1) as number;
								const clientIncr = util.promisify(client.incr).bind(client);
								// @ts-ignore
								const incrementVal = await clientIncr(keyIncr);
								if (expire && ttl > 0) {
									const clientExpire = util.promisify(client.expire).bind(client);
									await clientExpire(keyIncr, ttl);
								}
								returnItems.push({ json: { [keyIncr]: incrementVal } });
							} else if (operation === 'publish') {
								const channel = this.getNodeParameter('channel', itemIndex) as string;
								const messageData = this.getNodeParameter('messageData', itemIndex) as string;
								const clientPublish = util.promisify(client.publish).bind(client);
								await clientPublish(channel, messageData);
								returnItems.push(items[itemIndex]);
							} else if (operation === 'push') {
								const redisList = this.getNodeParameter('list', itemIndex) as string;
								const messageData = this.getNodeParameter('messageData', itemIndex) as string;
								const tail = this.getNodeParameter('tail', itemIndex, false) as boolean;
								const action = tail ? client.RPUSH : client.LPUSH;
								const clientPush = util.promisify(action).bind(client);
								// @ts-ignore: typescript not understanding generic function signatures
								await clientPush(redisList, messageData);
								returnItems.push(items[itemIndex]);
							} else if (operation === 'pop') {
								const redisList = this.getNodeParameter('list', itemIndex) as string;
								const tail = this.getNodeParameter('tail', itemIndex, false) as boolean;
								const propertyName = this.getNodeParameter(
									'propertyName',
									itemIndex,
									'propertyName',
								) as string;

								const action = tail ? client.rpop : client.lpop;
								const clientPop = util.promisify(action).bind(client);
								const value = await clientPop(redisList);

								let outputValue;
								try {
									outputValue = JSON.parse(value);
								} catch {
									outputValue = value;
								}
								const options = this.getNodeParameter('options', itemIndex, {});
								if (options.dotNotation === false) {
									item.json[propertyName] = outputValue;
								} else {
									set(item.json, propertyName, outputValue);
								}
								returnItems.push(item);
							}
						}

						client.quit();
						resolve(this.prepareOutputData(returnItems));
					}
				} catch (error) {
					reject(error);
				}
			});
		});
	}
}