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

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

import {
	connect,
	copyInputItems,
	destroy,
	execute,
} from './GenericFunctions';

import * as snowflake from 'snowflake-sdk';

export class Snowflake implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Snowflake',
		name: 'snowflake',
		icon: 'file:snowflake.png',
		group: ['input'],
		version: 1,
		description: 'Get, add and update data in Snowflake.',
		defaults: {
			name: 'Snowflake',
			color: '#5ebbeb',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'snowflake',
				required: true,
			},
		],
		properties: [
			{
				displayName: 'Operation',
				name: 'operation',
				type: 'options',
				options: [
					{
						name: 'Execute Query',
						value: 'executeQuery',
						description: 'Execute an SQL query.',
					},
					{
						name: 'Insert',
						value: 'insert',
						description: 'Insert rows in database.',
					},
					{
						name: 'Update',
						value: 'update',
						description: 'Update rows in database.',
					},
				],
				default: 'insert',
				description: 'The operation to perform.',
			},

			// ----------------------------------
			//         executeQuery
			// ----------------------------------
			{
				displayName: 'Query',
				name: 'query',
				type: 'string',
				typeOptions: {
					rows: 5,
				},
				displayOptions: {
					show: {
						operation: [
							'executeQuery',
						],
					},
				},
				default: '',
				placeholder: 'SELECT id, name FROM product WHERE id < 40',
				required: true,
				description: 'The SQL query to execute.',
			},


			// ----------------------------------
			//         insert
			// ----------------------------------
			{
				displayName: 'Table',
				name: 'table',
				type: 'string',
				displayOptions: {
					show: {
						operation: [
							'insert',
						],
					},
				},
				default: '',
				required: true,
				description: 'Name of the table in which to insert data to.',
			},
			{
				displayName: 'Columns',
				name: 'columns',
				type: 'string',
				displayOptions: {
					show: {
						operation: [
							'insert',
						],
					},
				},
				default: '',
				placeholder: 'id,name,description',
				description: 'Comma separated list of the properties which should used as columns for the new rows.',
			},


			// ----------------------------------
			//         update
			// ----------------------------------
			{
				displayName: 'Table',
				name: 'table',
				type: 'string',
				displayOptions: {
					show: {
						operation: [
							'update',
						],
					},
				},
				default: '',
				required: true,
				description: 'Name of the table in which to update data in',
			},
			{
				displayName: 'Update Key',
				name: 'updateKey',
				type: 'string',
				displayOptions: {
					show: {
						operation: [
							'update',
						],
					},
				},
				default: 'id',
				required: true,
				description: 'Name of the property which decides which rows in the database should be updated. Normally that would be "id".',
			},
			{
				displayName: 'Columns',
				name: 'columns',
				type: 'string',
				displayOptions: {
					show: {
						operation: [
							'update',
						],
					},
				},
				default: '',
				placeholder: 'name,description',
				description: 'Comma separated list of the properties which should used as columns for rows to update.',
			},

		],
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const credentials = this.getCredentials('snowflake') as unknown as snowflake.ConnectionOptions;
		const returnData: IDataObject[] = [];
		let responseData;

		const connection = snowflake.createConnection(credentials);

		await connect(connection);

		const items = this.getInputData();
		const operation = this.getNodeParameter('operation', 0) as string;

		if (operation === 'executeQuery') {
			// ----------------------------------
			//         executeQuery
			// ----------------------------------

			for (let i = 0; i < items.length; i++) {
				const query = this.getNodeParameter('query', i) as string;
				responseData = await execute(connection, query, []);
				returnData.push.apply(returnData, responseData as IDataObject[]);
			}
		}

		if (operation === 'insert') {
			// ----------------------------------
			//         insert
			// ----------------------------------

			const table = this.getNodeParameter('table', 0) as string;
			const columnString = this.getNodeParameter('columns', 0) as string;
			const columns = columnString.split(',').map(column => column.trim());
			const query = `INSERT INTO ${table}(${columns.join(',')}) VALUES (${columns.map(column => '?').join(',')})`;
			const data = copyInputItems(items, columns);
			const binds = data.map((element => Object.values(element)));
			await execute(connection, query, binds as unknown as snowflake.InsertBinds);
			returnData.push.apply(returnData, data);
		}

		if (operation === 'update') {
			// ----------------------------------
			//         update
			// ----------------------------------

			const table = this.getNodeParameter('table', 0) as string;
			const updateKey = this.getNodeParameter('updateKey', 0) as string;
			const columnString = this.getNodeParameter('columns', 0) as string;
			const columns = columnString.split(',').map(column => column.trim());

			if (!columns.includes(updateKey)) {
				columns.unshift(updateKey);
			}

			const query = `UPDATE ${table} SET ${columns.map(column => `${column} = ?`).join(',')} WHERE ${updateKey} = ?;`;
			const data = copyInputItems(items, columns);
			const binds = data.map((element => Object.values(element).concat(element[updateKey])));
			for (let i = 0; i < binds.length; i++) {
				await execute(connection, query, binds[i] as unknown as snowflake.InsertBinds);
			}
			returnData.push.apply(returnData, data);
		}

		await destroy(connection);

		return [this.helpers.returnJsonArray(returnData)];
	}
}
