import {
	OptionsWithUri,
} from 'request';

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

import {
	ICredentialDataDecryptedObject,
	ICredentialTestFunctions,
	IDataObject,
	JsonObject,
	NodeApiError,
} from 'n8n-workflow';

export async function mauticApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, endpoint: string, body: any = {}, query?: IDataObject, uri?: string): Promise<any> { // tslint:disable-line:no-any
	const authenticationMethod = this.getNodeParameter('authentication', 0, 'credentials') as string;

	const options: OptionsWithUri = {
		headers: {},
		method,
		qs: query,
		uri: uri || `/api${endpoint}`,
		body,
		json: true,
	};

	try {

		let returnData;

		if (authenticationMethod === 'credentials') {
			const credentials = await this.getCredentials('mauticApi');
			const baseUrl = credentials.url as string;

			const base64Key = Buffer.from(`${credentials.username}:${credentials.password}`).toString('base64');

			options.headers!.Authorization = `Basic ${base64Key}`;

			options.uri = `${baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl}${options.uri}`;

			//@ts-ignore
			returnData = await this.helpers.request(options);
		} else {
			const credentials = await this.getCredentials('mauticOAuth2Api');
			const baseUrl = credentials.url as string;

			options.uri = `${baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl}${options.uri}`;
			//@ts-ignore
			returnData = await this.helpers.requestOAuth2.call(this, 'mauticOAuth2Api', options, { includeCredentialsOnRefreshOnBody: true });
		}

		if (returnData.errors) {
			// They seem to to sometimes return 200 status but still error.
			throw new NodeApiError(this.getNode(), returnData);
		}

		return returnData;
	} catch (error) {
		throw new NodeApiError(this.getNode(), error as JsonObject);
	}
}

/**
 * Make an API request to paginated mautic endpoint
 * and return all results
 */
export async function mauticApiRequestAllItems(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;
	let data: IDataObject[] = [];
	query.limit = 30;
	query.start = 0;

	do {
		responseData = await mauticApiRequest.call(this, method, endpoint, body, query);
		const values = Object.values(responseData[propertyName]);
		//@ts-ignore
		returnData.push.apply(returnData, values);
		query.start += query.limit;
		data = [];
	} while (
		responseData.total !== undefined &&
		(returnData.length - parseInt(responseData.total, 10)) < 0
	);

	return returnData;
}

export function validateJSON(json: string | undefined): any { // tslint:disable-line:no-any
	let result;
	try {
		result = JSON.parse(json!);
	} catch (exception) {
		result = undefined;
	}
	return result;
}

export async function validateCredentials(this: ICredentialTestFunctions, decryptedCredentials: ICredentialDataDecryptedObject): Promise<any> { // tslint:disable-line:no-any
	const credentials = decryptedCredentials;

	const {
		url,
		username,
		password,
	} = credentials as {
		url: string,
		username: string,
		password: string,
	};

	const base64Key = Buffer.from(`${username}:${password}`).toString('base64');

	const options: OptionsWithUri = {
		method: 'GET',
		headers: {
			Authorization: `Basic ${base64Key}`,
		},
		uri: url.endsWith('/') ? `${url}api/users/self` : `${url}/api/users/self`,
		json: true,
	};

	return await this.helpers.request(options);
}