import {
	paramCase,
	snakeCase,
} from 'change-case';

import {
	createHash,
} from 'crypto';

import {
	Builder,
} from 'xml2js';

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

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

import {
	bucketFields,
	bucketOperations,
} from './BucketDescription';

import {
	folderFields,
	folderOperations,
} from './FolderDescription';

import {
	fileFields,
	fileOperations,
} from './FileDescription';

import {
	awsApiRequestREST,
	awsApiRequestSOAP,
	awsApiRequestSOAPAllItems,
} from './GenericFunctions';

export class AwsS3 implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'AWS S3',
		name: 'awsS3',
		icon: 'file:s3.png',
		group: ['output'],
		version: 1,
		subtitle: '={{$parameter["operation"] + ": " + $parameter["resource"]}}',
		description: 'Sends data to AWS S3',
		defaults: {
			name: 'AWS S3',
			color: '#d05b4b',
		},
		inputs: ['main'],
		outputs: ['main'],
		credentials: [
			{
				name: 'aws',
				required: true,
			}
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				options: [
					{
						name: 'Bucket',
						value: 'bucket',
					},
					{
						name: 'File',
						value: 'file',
					},
					{
						name: 'Folder',
						value: 'folder',
					},
				],
				default: 'file',
				description: 'The operation to perform.',
			},
			// BUCKET
			...bucketOperations,
			...bucketFields,
			// FOLDER
			...folderOperations,
			...folderFields,
			// UPLOAD
			...fileOperations,
			...fileFields,
		],
	};

	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
		const items = this.getInputData();
		const returnData: IDataObject[] = [];
		const qs: IDataObject = {};
		let responseData;
		const resource = this.getNodeParameter('resource', 0) as string;
		const operation = this.getNodeParameter('operation', 0) as string;
		for (let i = 0; i < items.length; i++) {
			const headers: IDataObject = {};
			if (resource === 'bucket') {
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateBucket.html
				if (operation === 'create') {
					const credentials = this.getCredentials('aws');
					const name = this.getNodeParameter('name', i) as string;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					if (additionalFields.acl) {
						headers['x-amz-acl'] = paramCase(additionalFields.acl as string);
					}
					if (additionalFields.bucketObjectLockEnabled) {
						headers['x-amz-bucket-object-lock-enabled'] = additionalFields.bucketObjectLockEnabled as boolean;
					}
					if (additionalFields.grantFullControl) {
						headers['x-amz-grant-full-control'] = '';
					}
					if (additionalFields.grantRead) {
						headers['x-amz-grant-read'] = '';
					}
					if (additionalFields.grantReadAcp) {
						headers['x-amz-grant-read-acp'] = '';
					}
					if (additionalFields.grantWrite) {
						headers['x-amz-grant-write'] = '';
					}
					if (additionalFields.grantWriteAcp) {
						headers['x-amz-grant-write-acp'] = '';
					}
					let region = credentials!.region as string;

					if (additionalFields.region) {
						region = additionalFields.region as string;
					}

					const body: IDataObject = {
						CreateBucketConfiguration: {
							'$': {
								xmlns: 'http://s3.amazonaws.com/doc/2006-03-01/',
							},
						}
					};
					let data = '';
					// if credentials has the S3 defaul region (us-east-1) the body (XML) does not have to be sent.
					if (region !== 'us-east-1') {
						// @ts-ignore
						body.CreateBucketConfiguration.LocationConstraint = [region];
						const builder = new Builder();
						data = builder.buildObject(body);
					}
					responseData = await awsApiRequestSOAP.call(this, `${name}.s3`, 'PUT', '', data, qs, headers);

					returnData.push({ success: true });
				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListBuckets.html
				if (operation === 'getAll') {
					const returnAll = this.getNodeParameter('returnAll', 0) as boolean;
					if (returnAll) {
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListAllMyBucketsResult.Buckets.Bucket', 's3', 'GET', '');
					} else {
						qs.limit = this.getNodeParameter('limit', 0) as number;
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListAllMyBucketsResult.Buckets.Bucket', 's3', 'GET', '', '', qs);
						responseData = responseData.slice(0, qs.limit);
					}
					returnData.push.apply(returnData, responseData);
				}

				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html
				if (operation === 'search') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;
					const returnAll = this.getNodeParameter('returnAll', 0) as boolean;
					const additionalFields = this.getNodeParameter('additionalFields', 0) as IDataObject;

					if (additionalFields.prefix) {
						qs['prefix'] = additionalFields.prefix as string;
					}

					if (additionalFields.encodingType) {
						qs['encoding-type'] = additionalFields.encodingType as string;
					}

					if (additionalFields.delmiter) {
						qs['delimiter'] = additionalFields.delmiter as string;
					}

					if (additionalFields.fetchOwner) {
						qs['fetch-owner'] = additionalFields.fetchOwner as string;
					}

					if (additionalFields.startAfter) {
						qs['start-after'] = additionalFields.startAfter as string;
					}

					if (additionalFields.requesterPays) {
						qs['x-amz-request-payer'] = 'requester';
					}

					qs['list-type'] = 2;


					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._ as string;

					if (returnAll) {
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListBucketResult.Contents', `${bucketName}.s3`, 'GET', '', '', qs, {}, {}, region);
					} else {
						qs['max-keys'] = this.getNodeParameter('limit', 0) as number;
						responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', qs, {}, {}, region);
						responseData = responseData.ListBucketResult.Contents;
					}
					if (Array.isArray(responseData)) {
						returnData.push.apply(returnData, responseData);
					} else {
						returnData.push(responseData);
					}
				}
			}
			if (resource === 'folder') {
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html
				if (operation === 'create') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;
					const folderName = this.getNodeParameter('folderName', i) as string;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					let path = `/${folderName}/`;

					if (additionalFields.requesterPays) {
						headers['x-amz-request-payer'] = 'requester';
					}
					if (additionalFields.parentFolderKey) {
						path = `/${additionalFields.parentFolderKey}${folderName}/`;
					}
					if (additionalFields.storageClass) {
						headers['x-amz-storage-class'] = (snakeCase(additionalFields.storageClass as string)).toUpperCase();
					}
					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'PUT', path, '', qs, headers, {}, region);
					returnData.push({ success: true });
				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html
				if (operation === 'delete') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;
					const folderKey = this.getNodeParameter('folderKey', i) as string;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					responseData = await awsApiRequestSOAPAllItems.call(this, 'ListBucketResult.Contents', `${bucketName}.s3`, 'GET', '/', '', { 'list-type': 2, prefix: folderKey }, {}, {}, region);

					// folder empty then just delete it
					if (responseData.length === 0) {

						responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'DELETE', `/${folderKey}`, '', qs, {}, {}, region);

						responseData = { deleted: [ { 'Key': folderKey } ] };

					} else {
					// delete everything inside the folder
						const body: IDataObject = {
							Delete: {
								'$': {
									xmlns: 'http://s3.amazonaws.com/doc/2006-03-01/',
								},
								Object: [],
							},
						};

						for (const childObject of responseData) {
							//@ts-ignore
							(body.Delete.Object as IDataObject[]).push({
								Key: childObject.Key as string
							});
						}

						const builder = new Builder();
						const data = builder.buildObject(body);

						headers['Content-MD5'] = createHash('md5').update(data).digest('base64');

						headers['Content-Type'] = 'application/xml';

						responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'POST', '/', data, { delete: '' } , headers, {}, region);

						responseData = { deleted: responseData.DeleteResult.Deleted };
					}
					returnData.push(responseData);
				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html
				if (operation === 'getAll') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;
					const returnAll = this.getNodeParameter('returnAll', 0) as boolean;
					const options = this.getNodeParameter('options', 0) as IDataObject;

					if (options.folderKey) {
						qs['prefix'] = options.folderKey as string;
					}

					if (options.fetchOwner) {
						qs['fetch-owner'] = options.fetchOwner as string;
					}

					qs['list-type'] = 2;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					if (returnAll) {
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListBucketResult.Contents', `${bucketName}.s3`, 'GET', '', '', qs, {}, {}, region);
					} else {
						qs.limit = this.getNodeParameter('limit', 0) as number;
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListBucketResult.Contents', `${bucketName}.s3`, 'GET', '', '', qs, {}, {}, region);
					}
					if (Array.isArray(responseData)) {
						responseData = responseData.filter((e: IDataObject) => (e.Key as string).endsWith('/') && e.Size === '0' && e.Key !== options.folderKey);
						if (qs.limit) {
							responseData = responseData.splice(0, qs.limit as number);
						}
						returnData.push.apply(returnData, responseData);
					}
				}
			}
			if (resource === 'file') {
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_CopyObject.html
				if (operation === 'copy') {
					const sourcePath = this.getNodeParameter('sourcePath', i) as string;
					const destinationPath = this.getNodeParameter('destinationPath', i) as string;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;

					headers['x-amz-copy-source'] = sourcePath;

					if (additionalFields.requesterPays) {
						headers['x-amz-request-payer'] = 'requester';
					}
					if (additionalFields.storageClass) {
						headers['x-amz-storage-class'] = (snakeCase(additionalFields.storageClass as string)).toUpperCase();
					}
					if (additionalFields.acl) {
						headers['x-amz-acl'] = paramCase(additionalFields.acl as string);
					}
					if (additionalFields.grantFullControl) {
						headers['x-amz-grant-full-control'] = '';
					}
					if (additionalFields.grantRead) {
						headers['x-amz-grant-read'] = '';
					}
					if (additionalFields.grantReadAcp) {
						headers['x-amz-grant-read-acp'] = '';
					}
					if (additionalFields.grantWriteAcp) {
						headers['x-amz-grant-write-acp'] = '';
					}
					if (additionalFields.lockLegalHold) {
						headers['x-amz-object-lock-legal-hold'] = (additionalFields.lockLegalHold as boolean) ? 'ON' : 'OFF';
					}
					if (additionalFields.lockMode) {
						headers['x-amz-object-lock-mode'] = (additionalFields.lockMode as string).toUpperCase();
					}
					if (additionalFields.lockRetainUntilDate) {
						headers['x-amz-object-lock-retain-until-date'] = additionalFields.lockRetainUntilDate as string;
					}
					if (additionalFields.serverSideEncryption) {
						headers['x-amz-server-side-encryption'] = additionalFields.serverSideEncryption as string;
					}
					if (additionalFields.encryptionAwsKmsKeyId) {
						headers['x-amz-server-side-encryption-aws-kms-key-id'] = additionalFields.encryptionAwsKmsKeyId as string;
					}
					if (additionalFields.serverSideEncryptionContext) {
						headers['x-amz-server-side-encryption-context'] = additionalFields.serverSideEncryptionContext as string;
					}
					if (additionalFields.serversideEncryptionCustomerAlgorithm) {
						headers['x-amz-server-side-encryption-customer-algorithm'] = additionalFields.serversideEncryptionCustomerAlgorithm as string;
					}
					if (additionalFields.serversideEncryptionCustomerKey) {
						headers['x-amz-server-side-encryption-customer-key'] = additionalFields.serversideEncryptionCustomerKey as string;
					}
					if (additionalFields.serversideEncryptionCustomerKeyMD5) {
						headers['x-amz-server-side-encryption-customer-key-MD5'] = additionalFields.serversideEncryptionCustomerKeyMD5 as string;
					}
					if (additionalFields.taggingDirective) {
						headers['x-amz-tagging-directive'] = (additionalFields.taggingDirective as string).toUpperCase();
					}
					if (additionalFields.metadataDirective) {
						headers['x-amz-metadata-directive'] = (additionalFields.metadataDirective as string).toUpperCase();
					}

					const destinationParts = destinationPath.split('/');

					const bucketName = destinationParts[1];

					const destination = `/${destinationParts.slice(2, destinationParts.length).join('/')}`;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'PUT', destination, '', qs, headers, {}, region);
					returnData.push(responseData.CopyObjectResult);

				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html
				if (operation === 'download') {

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

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

					const fileName = fileKey.split('/')[fileKey.split('/').length - 1];

					if (fileKey.substring(fileKey.length - 1) === '/') {
						throw new Error('Downloding a whole directory is not yet supported, please provide a file key');
					}

					let region = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					region = region.LocationConstraint._;

					const response = await awsApiRequestREST.call(this, `${bucketName}.s3`, 'GET', `/${fileKey}`, '', qs, {}, {  encoding: null, resolveWithFullResponse: true }, region);

					let mimeType: string | undefined;
					if (response.headers['content-type']) {
						mimeType = response.headers['content-type'];
					}

					const newItem: INodeExecutionData = {
						json: items[i].json,
						binary: {},
					};

					if (items[i].binary !== undefined) {
						// Create a shallow copy of the binary data so that the old
						// data references which do not get changed still stay behind
						// but the incoming data does not get changed.
						Object.assign(newItem.binary, items[i].binary);
					}

					items[i] = newItem;

					const dataPropertyNameDownload = this.getNodeParameter('binaryPropertyName', i) as string;

					const data = Buffer.from(response.body as string, 'utf8');

					items[i].binary![dataPropertyNameDownload] = await this.helpers.prepareBinaryData(data as unknown as Buffer,  fileName, mimeType);
				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObject.html
				if (operation === 'delete') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;

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

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

					if (options.versionId) {
						qs.versionId = options.versionId as string;
					}

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'DELETE', `/${fileKey}`, '', qs, {}, {}, region);

					returnData.push({ success: true });
				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html
				if (operation === 'getAll') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;
					const returnAll = this.getNodeParameter('returnAll', 0) as boolean;
					const options = this.getNodeParameter('options', 0) as IDataObject;

					if (options.folderKey) {
						qs['prefix'] = options.folderKey as string;
					}

					if (options.fetchOwner) {
						qs['fetch-owner'] = options.fetchOwner as string;
					}

					qs['delimiter'] = '/';

					qs['list-type'] = 2;

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					if (returnAll) {
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListBucketResult.Contents', `${bucketName}.s3`, 'GET', '', '', qs, {}, {}, region);
					} else {
						qs.limit = this.getNodeParameter('limit', 0) as number;
						responseData = await awsApiRequestSOAPAllItems.call(this, 'ListBucketResult.Contents', `${bucketName}.s3`, 'GET', '', '', qs, {}, {}, region);
						responseData = responseData.splice(0, qs.limit);
					}
					if (Array.isArray(responseData)) {
						responseData = responseData.filter((e: IDataObject) => !(e.Key as string).endsWith('/') && e.Size !== '0');
						if (qs.limit) {
							responseData = responseData.splice(0, qs.limit as number);
						}
						returnData.push.apply(returnData, responseData);
					}
				}
				//https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html
				if (operation === 'upload') {
					const bucketName = this.getNodeParameter('bucketName', i) as string;
					const fileName = this.getNodeParameter('fileName', i) as string;
					const isBinaryData = this.getNodeParameter('binaryData', i) as boolean;
					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
					const tagsValues = (this.getNodeParameter('tagsUi', i) as IDataObject).tagsValues as IDataObject[];
					let path = '/';
					let body;

					if (additionalFields.requesterPays) {
						headers['x-amz-request-payer'] = 'requester';
					}
					if (additionalFields.parentFolderKey) {
						path = `/${additionalFields.parentFolderKey}/`;
					}
					if (additionalFields.storageClass) {
						headers['x-amz-storage-class'] = (snakeCase(additionalFields.storageClass as string)).toUpperCase();
					}
					if (additionalFields.acl) {
						headers['x-amz-acl'] = paramCase(additionalFields.acl as string);
					}
					if (additionalFields.grantFullControl) {
						headers['x-amz-grant-full-control'] = '';
					}
					if (additionalFields.grantRead) {
						headers['x-amz-grant-read'] = '';
					}
					if (additionalFields.grantReadAcp) {
						headers['x-amz-grant-read-acp'] = '';
					}
					if (additionalFields.grantWriteAcp) {
						headers['x-amz-grant-write-acp'] = '';
					}
					if (additionalFields.lockLegalHold) {
						headers['x-amz-object-lock-legal-hold'] = (additionalFields.lockLegalHold as boolean) ? 'ON' : 'OFF';
					}
					if (additionalFields.lockMode) {
						headers['x-amz-object-lock-mode'] = (additionalFields.lockMode as string).toUpperCase();
					}
					if (additionalFields.lockRetainUntilDate) {
						headers['x-amz-object-lock-retain-until-date'] = additionalFields.lockRetainUntilDate as string;
					}
					if (additionalFields.serverSideEncryption) {
						headers['x-amz-server-side-encryption'] = additionalFields.serverSideEncryption as string;
					}
					if (additionalFields.encryptionAwsKmsKeyId) {
						headers['x-amz-server-side-encryption-aws-kms-key-id'] = additionalFields.encryptionAwsKmsKeyId as string;
					}
					if (additionalFields.serverSideEncryptionContext) {
						headers['x-amz-server-side-encryption-context'] = additionalFields.serverSideEncryptionContext as string;
					}
					if (additionalFields.serversideEncryptionCustomerAlgorithm) {
						headers['x-amz-server-side-encryption-customer-algorithm'] = additionalFields.serversideEncryptionCustomerAlgorithm as string;
					}
					if (additionalFields.serversideEncryptionCustomerKey) {
						headers['x-amz-server-side-encryption-customer-key'] = additionalFields.serversideEncryptionCustomerKey as string;
					}
					if (additionalFields.serversideEncryptionCustomerKeyMD5) {
						headers['x-amz-server-side-encryption-customer-key-MD5'] = additionalFields.serversideEncryptionCustomerKeyMD5 as string;
					}
					if (tagsValues) {
						const tags: string[] = [];
						tagsValues.forEach((o: IDataObject) => { tags.push(`${o.key}=${o.value}`); });
						headers['x-amz-tagging'] = tags.join('&');
					}

					responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'GET', '', '', { location: '' });

					const region = responseData.LocationConstraint._;

					if (isBinaryData) {
						const binaryPropertyName = this.getNodeParameter('binaryPropertyName', 0) as string;

						if (items[i].binary === undefined) {
							throw new Error('No binary data exists on item!');
						}

						if ((items[i].binary as IBinaryKeyData)[binaryPropertyName] === undefined) {
							throw new Error(`No binary data property "${binaryPropertyName}" does not exists on item!`);
						}

						const binaryData = (items[i].binary as IBinaryKeyData)[binaryPropertyName];

						body = Buffer.from(binaryData.data, BINARY_ENCODING) as Buffer;

						headers['Content-Type'] = binaryData.mimeType;

						headers['Content-MD5'] = createHash('md5').update(body).digest('base64');

						responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'PUT', `${path}${fileName || binaryData.fileName}`, body, qs, headers, {}, region);

					} else {

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

						body = Buffer.from(fileContent, 'utf8');

						headers['Content-Type'] = 'text/html';

						headers['Content-MD5'] = createHash('md5').update(fileContent).digest('base64');

						responseData = await awsApiRequestSOAP.call(this, `${bucketName}.s3`, 'PUT', `${path}${fileName}`, body, qs, headers, {}, region);
					}
					returnData.push({ success: true });
				}
			}
		}
		if (resource === 'file' && operation === 'download') {
			// For file downloads the files get attached to the existing items
			return this.prepareOutputData(items);
		} else {
			return [this.helpers.returnJsonArray(returnData)];
		}
	}
}