import {
	OptionsWithUri,
} from 'request';

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

import {
	IDataObject,
} from 'n8n-workflow';

export async function googleApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri: string | null = null): Promise<any> { // tslint:disable-line:no-any

	const options: OptionsWithUri = {
		headers: {
			'Content-Type': 'application/json',
		},
		method,
		body,
		qs,
		qsStringifyOptions: {
			arrayFormat: 'repeat',
		},
		uri: uri || `https://firestore.googleapis.com/v1/projects${resource}`,
		json: true,
	};
	try {
		if (Object.keys(body).length === 0) {
			delete options.body;
		}

		//@ts-ignore
		return await this.helpers.requestOAuth2.call(this, 'googleFirebaseCloudFirestoreOAuth2Api', options);
	} catch (error) {
		let errors;

		if (error.response && error.response.body) {

			if (Array.isArray(error.response.body)) {

				errors = error.response.body;

				errors = errors.map((e: { error: { message: string } }) => e.error.message).join('|');
			} else {
				errors = error.response.body.error.message;
			}

			// Try to return the error prettier
			throw new Error(
				`Google Firebase error response [${error.statusCode}]: ${errors}`,
			);
		}
		throw error;
	}
}

export async function googleApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}, uri: string | null = null): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;
	query.pageSize = 100;

	do {
		responseData = await googleApiRequest.call(this, method, endpoint, body, query, uri);
		query.pageToken = responseData['nextPageToken'];
		returnData.push.apply(returnData, responseData[propertyName]);
	} while (
		responseData['nextPageToken'] !== undefined &&
		responseData['nextPageToken'] !== ''
	);

	return returnData;
}


// Both functions below were taken from Stack Overflow jsonToDocument was fixed as it was unable to handle null values correctly
// https://stackoverflow.com/questions/62246410/how-to-convert-a-firestore-document-to-plain-json-and-vice-versa
// Great thanks to https://stackoverflow.com/users/3915246/mahindar
export function jsonToDocument(value: string | number | IDataObject | IDataObject[]): IDataObject {
	if (value === 'true' || value === 'false' || typeof value === 'boolean') {
		return { 'booleanValue': value };
	} else if (value === null) {
		return { 'nullValue': null };
	} else if (!isNaN(value as number)) {
		if (value.toString().indexOf('.') !== -1) {
			return { 'doubleValue': value };
		} else {
			return { 'integerValue': value };
		}
	} else if (Date.parse(value as string)) {
		const date = new Date(Date.parse(value as string));
		return { 'timestampValue': date.toISOString() };
	} else if (typeof value === 'string') {
		return { 'stringValue': value };
	} else if (value && value.constructor === Array) {
		return { 'arrayValue': { values: value.map(v => jsonToDocument(v)) } };
	} else if (typeof value === 'object') {
		const obj = {};
		for (const o of Object.keys(value)) {
			//@ts-ignore
			obj[o] = jsonToDocument(value[o]);
		}
		return { 'mapValue': { fields: obj } };
	}

	return {};
}

export function fullDocumentToJson(data: IDataObject): IDataObject {
	if (data === undefined) {
		return data;
	}

	return {
		_name: data.name,
		_createTime: data.createTime,
		_updateTime: data.updateTime,
		...documentToJson(data.fields as IDataObject),
	};
}


export function documentToJson(fields: IDataObject): IDataObject {
	const result = {};
	for (const f of Object.keys(fields)) {
		const key = f, value = fields[f],
			isDocumentType = ['stringValue', 'booleanValue', 'doubleValue',
				'integerValue', 'timestampValue', 'mapValue', 'arrayValue'].find(t => t === key);
		if (isDocumentType) {
			const item = ['stringValue', 'booleanValue', 'doubleValue', 'integerValue', 'timestampValue']
				.find(t => t === key);
			if (item) {
				return value as IDataObject;
			} else if ('mapValue' === key) {
				//@ts-ignore
				return documentToJson(value!.fields || {});
			} else if ('arrayValue' === key) {
				// @ts-ignore
				const list = value.values as IDataObject[];
				// @ts-ignore
				return !!list ? list.map(l => documentToJson(l)) : [];
			}
		} else {
			// @ts-ignore
			result[key] = documentToJson(value);
		}
	}
	return result;
}