import {
	IExecuteSingleFunctions,
	IHttpRequestOptions,
	IN8nHttpFullResponse,
	INodeExecutionData,
	NodeApiError,
} from 'n8n-workflow';

// Regular expressions used to extract binId from parameter value
const BIN_ID_REGEX = /\b\d{13}-\d{13}\b/g;

/**
 * Creates correctly-formatted PostBin API URL based on the entered binId.
 * This function makes sure binId is in the expected format by parsing it
 * from current node parameter value.
 *
 * @export
 * @param {IExecuteSingleFunctions} this
 * @param {IHttpRequestOptions} requestOptions
 * @returns {Promise<IHttpRequestOptions>} requestOptions
 */
export async function buildBinAPIURL(this: IExecuteSingleFunctions, requestOptions: IHttpRequestOptions): Promise<IHttpRequestOptions>  {
	const binId = parseBinId(this);
	// Assemble the PostBin API URL and put it back to requestOptions
	requestOptions.url = `/developers/postbin/api/bin/${binId}`;

	return requestOptions;
}

/**
 * Creates correctly-formatted PostBin Bin test URL based on the entered binId.
 * This function makes sure binId is in the expected format by parsing it
 * from current node parameter value.
 *
 * @export
 * @param {IExecuteSingleFunctions} this
 * @param {IHttpRequestOptions} requestOptions
 * @returns {Promise<IHttpRequestOptions>} requestOptions
 */
export async function buildBinTestURL(this: IExecuteSingleFunctions, requestOptions: IHttpRequestOptions): Promise<IHttpRequestOptions>  {
	const binId = parseBinId(this);

	// Assemble the PostBin API URL and put it back to requestOptions
	requestOptions.url = `/developers/postbin/${binId}`;
	return requestOptions;
}

/**
 * Creates correctly-formatted PostBin API URL based on the entered binId and reqId.
 * This function makes sure binId is in the expected format by parsing it
 * from current node parameter value.
 *
 * @export
 * @param {IExecuteSingleFunctions} this
 * @param {IHttpRequestOptions} requestOptions
 * @returns {Promise<IHttpRequestOptions>} requestOptions
 */
export async function buildRequestURL(this: IExecuteSingleFunctions, requestOptions: IHttpRequestOptions): Promise<IHttpRequestOptions>  {
	const reqId = this.getNodeParameter('requestId', 'shift') as string;
	const binId = parseBinId(this);

	requestOptions.url = `/developers/postbin/api/bin/${binId}/req/${reqId}`;
	return requestOptions;
}

/**
 * Extracts the PostBin Bin Id from the specified string.
 * This method should be able to extract bin Id from the
 * PostBin URL or from the string in the following format:
 * `Bin '<binId>'.`
 *
 * @param {IExecuteSingleFunctions} this
 * @param {IHttpRequestOptions} requestOptions
 * @returns {Promise<IHttpRequestOptions>} requestOptions
 */
function parseBinId(context: IExecuteSingleFunctions) {
	const binId = context.getNodeParameter('binId') as string;
	// Test if the Bin id is in the expected format
	BIN_ID_REGEX.lastIndex = 0;
	const idMatch = BIN_ID_REGEX.exec(binId);

	// Return what is matched
	if(idMatch) {
		return idMatch[0];
	}

	// If it's not recognized, error out
 throw new NodeApiError(context.getNode(), {}, {
	 message: 'Bin ID format is not valid',
	 description: 'Please check the provided Bin ID and try again.',
	 parseXml: false,
 });
}

/**
 * Converts the bin response data and adds additional properties
 *
 * @param {IExecuteSingleFunctions} this
 * @param {INodeExecutionData} items[]
 * @param {IN8nHttpFullResponse} response
 * @returns {Promise<INodeExecutionData[]>}
 */
 export async function transformBinReponse(this: IExecuteSingleFunctions, items: INodeExecutionData[], response: IN8nHttpFullResponse): Promise<INodeExecutionData[]> {
	items.forEach(item => item.json = {
		'binId': item.json.binId,
		'nowTimestamp': item.json.now,
		'nowIso': new Date(item.json.now as string).toISOString(),
		'expiresTimestamp': item.json.expires,
		'expiresIso': new Date(item.json.expires as string).toISOString(),
		'requestUrl': 'https://www.toptal.com/developers/postbin/' + item.json.binId,
		'viewUrl': 'https://www.toptal.com/developers/postbin/b/' + item.json.binId,
	});
	return items;
}