import {
	OptionsWithUri,
} from 'request';

import {
	IExecuteFunctions,
	IExecuteSingleFunctions,
	IHookFunctions,
	ILoadOptionsFunctions,
} from 'n8n-core';

import {
	IDataObject
} from 'n8n-workflow';

export async function harvestApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, qs: IDataObject = {}, path: string, body: IDataObject = {}, option: IDataObject = {}, uri?: string): Promise<any> { // tslint:disable-line:no-any
	let options: OptionsWithUri = {
		headers: {
			'Harvest-Account-Id': `${this.getNodeParameter('accountId', 0)}`,
			'User-Agent': 'Harvest App',
			'Authorization': '',
		},
		method,
		body,
		uri: uri || `https://api.harvestapp.com/v2/${path}`,
		qs,
		json: true,
	};

	options = Object.assign({}, options, option);
	if (Object.keys(options.body).length === 0) {
		delete options.body;
	}
	const authenticationMethod = this.getNodeParameter('authentication', 0);

	try {
		if (authenticationMethod === 'accessToken') {
			const credentials = this.getCredentials('harvestApi') as IDataObject;

			if (credentials === undefined) {
				throw new Error('No credentials got returned!');
			}

			//@ts-ignore
			options.headers['Authorization'] = `Bearer ${credentials.accessToken}`;

			return await this.helpers.request!(options);
		} else {
			return await this.helpers.requestOAuth2!.call(this, 'harvestOAuth2Api', options);
		}
	} catch (error) {
		if (error.statusCode === 401) {
			// Return a clear error
			throw new Error('The Harvest credentials are not valid!');
		}

		if (error.error && error.error.message) {
			// Try to return the error prettier
			throw new Error(`Harvest error response [${error.statusCode}]: ${error.error.message}`);
		}

		// If that data does not exist for some reason return the actual error
		throw new Error(`Harvest error response: ${error.message}`);
	}
}

/**
 * Make an API request to paginated flow endpoint
 * and return all results
 */
export async function harvestApiRequestAllItems(
	this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions,
	method: string,
	qs: IDataObject = {},
	uri: string,
	resource: string,
	body: IDataObject = {},
	option: IDataObject = {},
): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;

	do {
		responseData = await harvestApiRequest.call(this, method, qs, uri, body, option);
		qs.page = responseData.next_page;
		returnData.push.apply(returnData, responseData[resource]);
	} while (responseData.next_page);

	return returnData;
}

/**
 * fetch All resource using paginated calls
 */
export async function getAllResource(this: IExecuteFunctions | ILoadOptionsFunctions, resource: string, i: number) {
	const endpoint = resource;
	const qs: IDataObject = {};
	const requestMethod = 'GET';

	qs.per_page = 100;

	const additionalFields = this.getNodeParameter('filters', i) as IDataObject;
	const returnAll = this.getNodeParameter('returnAll', i) as boolean;

	Object.assign(qs, additionalFields);

	let responseData: IDataObject = {};
	if (returnAll) {
		responseData[resource] = await harvestApiRequestAllItems.call(this, requestMethod, qs, endpoint, resource);
	} else {
		const limit = this.getNodeParameter('limit', i) as string;
		qs.per_page = limit;
		responseData = await harvestApiRequest.call(this, requestMethod, qs, endpoint);
	}
	return responseData[resource] as IDataObject[];
}