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

import {
	IDataObject,
	ILoadOptionsFunctions,
	NodeApiError,
	NodeOperationError,
} from 'n8n-workflow';

import {
	OptionsWithUri,
} from 'request';

import {
	GrafanaCredentials,
} from './types';

export async function grafanaApiRequest(
	this: IExecuteFunctions | ILoadOptionsFunctions,
	method: string,
	endpoint: string,
	body: IDataObject = {},
	qs: IDataObject = {},
) {
	const {
		baseUrl: rawBaseUrl,
	} = await this.getCredentials('grafanaApi') as GrafanaCredentials;

	const baseUrl = tolerateTrailingSlash(rawBaseUrl);

	const options: OptionsWithUri = {
		headers: {
			'Content-Type': 'application/json',
		},
		method,
		body,
		qs,
		uri: `${baseUrl}/api${endpoint}`,
		json: true,
	};

	if (!Object.keys(body).length) {
		delete options.body;
	}

	if (!Object.keys(qs).length) {
		delete options.qs;
	}

	try {
		return await this.helpers.requestWithAuthentication.call(this, 'grafanaApi', options);
	} catch (error) {
		if (error?.response?.data?.message === 'Team member not found') {
			error.response.data.message += '. Are you sure the user is a member of this team?';
		}

		if (error?.response?.data?.message === 'Team not found') {
			error.response.data.message += ' with the provided ID';
		}

		if (error?.response?.data?.message === 'A dashboard with the same name in the folder already exists') {
			error.response.data.message = 'A dashboard with the same name already exists in the selected folder';
		}

		if (error?.response?.data?.message === 'Team name taken') {
			error.response.data.message = 'This team name is already taken. Please choose a new one.';
		}

		if (error?.code === 'ECONNREFUSED') {
			error.message = 'Invalid credentials or error in establishing connection with given credentials';
		}

		throw new NodeApiError(this.getNode(), error);
	}
}

export function throwOnEmptyUpdate(
	this: IExecuteFunctions,
	resource: string,
	updateFields: IDataObject,
) {
	if (!Object.keys(updateFields).length) {
		throw new NodeOperationError(
			this.getNode(),
			`Please enter at least one field to update for the ${resource}.`,
		);
	}
}

export function tolerateTrailingSlash(baseUrl: string) {
	return baseUrl.endsWith('/')
		? baseUrl.substr(0, baseUrl.length - 1)
		: baseUrl;
}

export function deriveUid(this: IExecuteFunctions, uidOrUrl: string) {
	if (!uidOrUrl.startsWith('http')) return uidOrUrl;

	const urlSegments = uidOrUrl.split('/');
	const uid = urlSegments[urlSegments.indexOf('d') + 1];

	if (!uid) {
		throw new NodeOperationError(this.getNode(), 'Failed to derive UID from URL');
	}

	return uid;
}