import { IExecuteFunctions } from 'n8n-core';
import {
	INodeExecutionData,
	INodeParameters,
	INodeType,
	INodeTypeDescription,
	NodeOperationError,
	NodeParameterValue,
} from 'n8n-workflow';


export class Switch implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Switch',
		name: 'switch',
		icon: 'fa:map-signs',
		group: ['transform'],
		version: 1,
		description: 'Route items depending on defined expression or rules',
		defaults: {
			name: 'Switch',
			color: '#506000',
		},
		inputs: ['main'],
		outputs: ['main', 'main', 'main', 'main'],
		outputNames: ['0', '1', '2', '3'],
		properties: [
			{
				displayName: 'Mode',
				name: 'mode',
				type: 'options',
				options: [
					{
						name: 'Expression',
						value: 'expression',
						description: 'Expression decides how to route data.',
					},
					{
						name: 'Rules',
						value: 'rules',
						description: 'Rules decide how to route data.',
					},
				],
				default: 'rules',
				description: 'How data should be routed.',
			},


			// ----------------------------------
			//         mode:expression
			// ----------------------------------
			{
				displayName: 'Output',
				name: 'output',
				type: 'number',
				typeOptions: {
					minValue: 0,
					maxValue: 3,
				},
				displayOptions: {
					show: {
						mode: [
							'expression',
						],
					},
				},
				default: 0,
				description: 'The index of output to which to send data to.',
			},


			// ----------------------------------
			//         mode:rules
			// ----------------------------------
			{
				displayName: 'Data Type',
				name: 'dataType',
				type: 'options',
				displayOptions: {
					show: {
						mode: [
							'rules',
						],
					},
				},
				options: [
					{
						name: 'Boolean',
						value: 'boolean',
					},
					{
						name: 'Date & Time',
						value: 'dateTime',
					},
					{
						name: 'Number',
						value: 'number',
					},
					{
						name: 'String',
						value: 'string',
					},
				],
				default: 'number',
				description: 'The type of data to route on.',
			},

			// ----------------------------------
			//         dataType:boolean
			// ----------------------------------
			{
				displayName: 'Value 1',
				name: 'value1',
				type: 'boolean',
				displayOptions: {
					show: {
						dataType: [
							'boolean',
						],
						mode: [
							'rules',
						],
					},
				},
				default: false,
				description: 'The value to compare with the second one.',
			},
			{
				displayName: 'Routing Rules',
				name: 'rules',
				placeholder: 'Add Routing Rule',
				type: 'fixedCollection',
				typeOptions: {
					multipleValues: true,
				},
				displayOptions: {
					show: {
						dataType: [
							'boolean',
						],
						mode: [
							'rules',
						],
					},
				},
				description: 'The routing rules.',
				default: {},
				options: [
					{
						name: 'rules',
						displayName: 'Boolean',
						values: [
							{
								displayName: 'Operation',
								name: 'operation',
								type: 'options',
								options: [
									{
										name: 'Equal',
										value: 'equal',
									},
									{
										name: 'Not Equal',
										value: 'notEqual',
									},
								],
								default: 'equal',
								description: 'Operation to decide where the the data should be mapped to.',
							},
							{
								displayName: 'Value 2',
								name: 'value2',
								type: 'boolean',
								default: false,
								description: 'The value to compare with the first one.',
							},
							{
								displayName: 'Output',
								name: 'output',
								type: 'number',
								typeOptions: {
									minValue: 0,
									maxValue: 3,
								},
								default: 0,
								description: 'The index of output to which to send data to if rule matches.',
							},
						],
					},
				],
			},

			// ----------------------------------
			//         dataType:dateTime
			// ----------------------------------
			{
				displayName: 'Value 1',
				name: 'value1',
				type: 'dateTime',
				displayOptions: {
					show: {
						dataType: [
							'dateTime',
						],
						mode: [
							'rules',
						],
					},
				},
				default: '',
				description: 'The value to compare with the second one.',
			},
			{
				displayName: 'Routing Rules',
				name: 'rules',
				placeholder: 'Add Routing Rule',
				type: 'fixedCollection',
				typeOptions: {
					multipleValues: true,
				},
				displayOptions: {
					show: {
						dataType: [
							'dateTime',
						],
						mode: [
							'rules',
						],
					},
				},
				description: 'The routing rules.',
				default: {},
				options: [
					{
						name: 'rules',
						displayName: 'Dates',
						values: [
							{
								displayName: 'Operation',
								name: 'operation',
								type: 'options',
								options: [
									{
										name: 'Occurred after',
										value: 'after',
									},
									{
										name: 'Occurred before',
										value: 'before',
									},
								],
								default: 'after',
								description: 'Operation to decide where the the data should be mapped to.',
							},
							{
								displayName: 'Value 2',
								name: 'value2',
								type: 'dateTime',
								default: 0,
								description: 'The value to compare with the first one.',
							},
							{
								displayName: 'Output',
								name: 'output',
								type: 'number',
								typeOptions: {
									minValue: 0,
									maxValue: 3,
								},
								default: 0,
								description: 'The index of output to which to send data to if rule matches.',
							},
						],
					},
				],
			},

			// ----------------------------------
			//         dataType:number
			// ----------------------------------
			{
				displayName: 'Value 1',
				name: 'value1',
				type: 'number',
				displayOptions: {
					show: {
						dataType: [
							'number',
						],
						mode: [
							'rules',
						],
					},
				},
				default: 0,
				description: 'The value to compare with the second one.',
			},
			{
				displayName: 'Routing Rules',
				name: 'rules',
				placeholder: 'Add Routing Rule',
				type: 'fixedCollection',
				typeOptions: {
					multipleValues: true,
				},
				displayOptions: {
					show: {
						dataType: [
							'number',
						],
						mode: [
							'rules',
						],
					},
				},
				description: 'The routing rules.',
				default: {},
				options: [
					{
						name: 'rules',
						displayName: 'Numbers',
						values: [
							{
								displayName: 'Operation',
								name: 'operation',
								type: 'options',
								options: [
									{
										name: 'Smaller',
										value: 'smaller',
									},
									{
										name: 'Smaller Equal',
										value: 'smallerEqual',
									},
									{
										name: 'Equal',
										value: 'equal',
									},
									{
										name: 'Not Equal',
										value: 'notEqual',
									},
									{
										name: 'Larger',
										value: 'larger',
									},
									{
										name: 'Larger Equal',
										value: 'largerEqual',
									},
								],
								default: 'smaller',
								description: 'Operation to decide where the the data should be mapped to.',
							},
							{
								displayName: 'Value 2',
								name: 'value2',
								type: 'number',
								default: 0,
								description: 'The value to compare with the first one.',
							},
							{
								displayName: 'Output',
								name: 'output',
								type: 'number',
								typeOptions: {
									minValue: 0,
									maxValue: 3,
								},
								default: 0,
								description: 'The index of output to which to send data to if rule matches.',
							},
						],
					},
				],
			},

			// ----------------------------------
			//         dataType:string
			// ----------------------------------
			{
				displayName: 'Value 1',
				name: 'value1',
				type: 'string',
				displayOptions: {
					show: {
						dataType: [
							'string',
						],
						mode: [
							'rules',
						],
					},
				},
				default: '',
				description: 'The value to compare with the second one.',
			},
			{
				displayName: 'Routing Rules',
				name: 'rules',
				placeholder: 'Add Routing Rule',
				type: 'fixedCollection',
				typeOptions: {
					multipleValues: true,
				},
				displayOptions: {
					show: {
						dataType: [
							'string',
						],
						mode: [
							'rules',
						],
					},
				},
				description: 'The routing rules.',
				default: {},
				options: [
					{
						name: 'rules',
						displayName: 'Strings',
						values: [
							{
								displayName: 'Operation',
								name: 'operation',
								type: 'options',
								options: [
									{
										name: 'Contains',
										value: 'contains',
									},
									{
										name: 'Ends With',
										value: 'endsWith',
									},
									{
										name: 'Equal',
										value: 'equal',
									},
									{
										name: 'Not Contains',
										value: 'notContains',
									},
									{
										name: 'Not Equal',
										value: 'notEqual',
									},
									{
										name: 'Regex',
										value: 'regex',
									},
									{
										name: 'Starts With',
										value: 'startsWith',
									},
								],
								default: 'equal',
								description: 'Operation to decide where the the data should be mapped to.',
							},
							{
								displayName: 'Value 2',
								name: 'value2',
								type: 'string',
								displayOptions: {
									hide: {
										operation: [
											'regex',
										],
									},
								},
								default: '',
								description: 'The value to compare with the first one.',
							},
							{
								displayName: 'Regex',
								name: 'value2',
								type: 'string',
								displayOptions: {
									show: {
										operation: [
											'regex',
										],
									},
								},
								default: '',
								placeholder: '/text/i',
								description: 'The regex which has to match.',
							},
							{
								displayName: 'Output',
								name: 'output',
								type: 'number',
								typeOptions: {
									minValue: 0,
									maxValue: 3,
								},
								default: 0,
								description: 'The index of output to which to send data to if rule matches.',
							},
						],
					},
				],
			},


			{
				displayName: 'Fallback Output',
				name: 'fallbackOutput',
				type: 'options',
				displayOptions: {
					show: {
						mode: [
							'rules',
						],
					},
				},
				options: [
					{
						name: 'None',
						value: -1,
					},
					{
						name: '0',
						value: 0,
					},
					{
						name: '1',
						value: 1,
					},
					{
						name: '2',
						value: 2,
					},
					{
						name: '3',
						value: 3,
					},
				],
				default: -1,
				description: 'The output to which to route all items which do not match any of the rules.',
			},

		],
	};


	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const returnData: INodeExecutionData[][] = [
			[],
			[],
			[],
			[],
		];

		const items = this.getInputData();

		let compareOperationResult: boolean;
		let item: INodeExecutionData;
		let mode: string;
		let outputIndex: number;
		let ruleData: INodeParameters;
		let value1: NodeParameterValue, value2: NodeParameterValue;

		// The compare operations
		const compareOperationFunctions: {
			[key: string]: (value1: NodeParameterValue, value2: NodeParameterValue) => boolean;
		} = {
			after: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) > (value2 || 0),
			before: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) < (value2 || 0),
			contains: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || '').toString().includes((value2 || '').toString()),
			notContains: (value1: NodeParameterValue, value2: NodeParameterValue) => !(value1 || '').toString().includes((value2 || '').toString()),
			endsWith: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 as string).endsWith(value2 as string),
			equal: (value1: NodeParameterValue, value2: NodeParameterValue) => value1 === value2,
			notEqual: (value1: NodeParameterValue, value2: NodeParameterValue) => value1 !== value2,
			larger: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) > (value2 || 0),
			largerEqual: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) >= (value2 || 0),
			smaller: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) < (value2 || 0),
			smallerEqual: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) <= (value2 || 0),
			startsWith: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 as string).startsWith(value2 as string),
			regex: (value1: NodeParameterValue, value2: NodeParameterValue) => {
				const regexMatch = (value2 || '').toString().match(new RegExp('^/(.*?)/([gimusy]*)$'));

				let regex: RegExp;
				if (!regexMatch) {
					regex = new RegExp((value2 || '').toString());
				} else if (regexMatch.length === 1) {
					regex = new RegExp(regexMatch[1]);
				} else {
					regex = new RegExp(regexMatch[1], regexMatch[2]);
				}

				return !!(value1 || '').toString().match(regex);
			},
		};

		// Converts the input data of a dateTime into a number for easy compare
		const convertDateTime = (value: NodeParameterValue): number => {
			let returnValue: number | undefined = undefined;
			if (typeof value === 'string') {
				returnValue = new Date(value).getTime();
			} else if (typeof value === 'number') {
				returnValue = value;
			} if ((value as unknown as object) instanceof Date) {
				returnValue = (value as unknown as Date).getTime();
			}

			if (returnValue === undefined || isNaN(returnValue)) {
				throw new NodeOperationError(this.getNode(), `The value "${value}" is not a valid DateTime.`);
			}

			return returnValue;
		};

		const checkIndexRange = (index: number) => {
			if (index < 0 || index >= returnData.length) {
				throw new NodeOperationError(this.getNode(), `The ouput ${index} is not allowed. It has to be between 0 and ${returnData.length - 1}!`);
			}
		};

		// Itterate over all items to check to which output they should be routed to
		itemLoop:
		for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
			try {

				item = items[itemIndex];
				mode = this.getNodeParameter('mode', itemIndex) as string;

				if (mode === 'expression') {
					// One expression decides how to route item
	
					outputIndex = this.getNodeParameter('output', itemIndex) as number;
					checkIndexRange(outputIndex);
	
					returnData[outputIndex].push(item);
				} else if (mode === 'rules') {
					// Rules decide how to route item
	
					const dataType = this.getNodeParameter('dataType', 0) as string;
	
					value1 = this.getNodeParameter('value1', itemIndex) as NodeParameterValue;
					if (dataType === 'dateTime') {
						value1 = convertDateTime(value1);
					}
	
					for (ruleData of this.getNodeParameter('rules.rules', itemIndex, []) as INodeParameters[]) {
						// Check if the values passes
	
						value2 = ruleData.value2 as NodeParameterValue;
						if (dataType === 'dateTime') {
							value2 = convertDateTime(value2);
						}
	
						compareOperationResult = compareOperationFunctions[ruleData.operation as string](value1, value2);
	
						if (compareOperationResult === true) {
							// If rule matches add it to the correct output and continue with next item
							checkIndexRange(ruleData.output as number);
							returnData[ruleData.output as number].push(item);
							continue itemLoop;
						}
					}
	
					// Check if a fallback output got defined and route accordingly
					outputIndex = this.getNodeParameter('fallbackOutput', itemIndex) as number;
					if (outputIndex !== -1) {
						checkIndexRange(outputIndex);
						returnData[outputIndex].push(item);
					}
				}

			} catch (error) {
				if (this.continueOnFail()) {
					returnData[0].push({json:{ error: error.message }});
					continue;
				}
				throw error;
			}
		}

		return returnData;
	}
}