import type {
	IDataObject,
	IExecuteFunctions,
	ILoadOptionsFunctions,
	IOAuth2Options,
	IHttpRequestMethods,
	IRequestOptions,
} from 'n8n-workflow';

import { NodeOperationError, jsonParse } from 'n8n-workflow';

import get from 'lodash/get';

export async function slackApiRequest(
	this: IExecuteFunctions | ILoadOptionsFunctions,
	method: IHttpRequestMethods,
	resource: string,
	body: object = {},
	query: IDataObject = {},
	headers: {} | undefined = undefined,
	option: {} = {},
	// tslint:disable-next-line:no-any
): Promise<any> {
	const authenticationMethod = this.getNodeParameter('authentication', 0, 'accessToken') as string;
	let options: IRequestOptions = {
		method,
		headers: headers ?? {
			'Content-Type': 'application/json; charset=utf-8',
		},
		body,
		qs: query,
		uri: `https://slack.com/api${resource}`,
		json: true,
	};
	options = Object.assign({}, options, option);
	if (Object.keys(body).length === 0) {
		delete options.body;
	}
	if (Object.keys(query).length === 0) {
		delete options.qs;
	}

	const oAuth2Options: IOAuth2Options = {
		tokenType: 'Bearer',
		property: 'authed_user.access_token',
	};

	const credentialType = authenticationMethod === 'accessToken' ? 'slackApi' : 'slackOAuth2Api';
	const response = await this.helpers.requestWithAuthentication.call(
		this,
		credentialType,
		options,
		{
			oauth2: oAuth2Options,
		},
	);

	if (response.ok === false) {
		if (response.error === 'paid_teams_only') {
			throw new NodeOperationError(
				this.getNode(),
				`Your current Slack plan does not include the resource '${
					this.getNodeParameter('resource', 0) as string
				}'`,
				{
					description:
						'Hint: Upgrade to a Slack plan that includes the functionality you want to use.',
					level: 'warning',
				},
			);
		} else if (response.error === 'missing_scope') {
			throw new NodeOperationError(
				this.getNode(),
				'Your Slack credential is missing required Oauth Scopes',
				{
					description: `Add the following scope(s) to your Slack App: ${response.needed}`,
					level: 'warning',
				},
			);
		}
		throw new NodeOperationError(
			this.getNode(),
			'Slack error response: ' + JSON.stringify(response.error),
		);
	}
	if (response.ts !== undefined) {
		Object.assign(response, { message_timestamp: response.ts });
		delete response.ts;
	}
	return response;
}

export async function slackApiRequestAllItems(
	this: IExecuteFunctions | ILoadOptionsFunctions,
	propertyName: string,
	method: IHttpRequestMethods,
	endpoint: string,
	// tslint:disable-next-line:no-any
	body: any = {},
	query: IDataObject = {},
	// tslint:disable-next-line:no-any
): Promise<any> {
	const returnData: IDataObject[] = [];
	let responseData;
	query.page = 1;
	//if the endpoint uses legacy pagination use count
	//https://api.slack.com/docs/pagination#classic
	if (endpoint.includes('files.list')) {
		query.count = 100;
	} else {
		query.limit = 100;
	}
	do {
		responseData = await slackApiRequest.call(this, method, endpoint, body as IDataObject, query);
		query.cursor = get(responseData, 'response_metadata.next_cursor');
		query.page++;
		returnData.push.apply(
			returnData,
			(responseData[propertyName].matches as IDataObject[]) ?? responseData[propertyName],
		);
	} while (
		(responseData.response_metadata?.next_cursor !== undefined &&
			responseData.response_metadata.next_cursor !== '' &&
			responseData.response_metadata.next_cursor !== null) ||
		(responseData.paging?.pages !== undefined &&
			responseData.paging.page !== undefined &&
			responseData.paging.page < responseData.paging.pages) ||
		(responseData[propertyName].paging?.pages !== undefined &&
			responseData[propertyName].paging.page !== undefined &&
			responseData[propertyName].paging.page < responseData[propertyName].paging.pages)
	);
	return returnData;
}

export function getMessageContent(
	this: IExecuteFunctions | ILoadOptionsFunctions,
	i: number,
	nodeVersion: number,
	instanceId?: string,
) {
	const includeLinkToWorkflow = this.getNodeParameter(
		'otherOptions.includeLinkToWorkflow',
		i,
		nodeVersion >= 2.1 ? true : false,
	) as IDataObject;

	const { id } = this.getWorkflow();
	const automatedMessage = `_Automated with this <${this.getInstanceBaseUrl()}workflow/${id}?utm_source=n8n-internal&utm_medium=powered_by&utm_campaign=${encodeURIComponent(
		'n8n-nodes-base.slack',
	)}${instanceId ? '_' + instanceId : ''}|n8n workflow>_`;
	const messageType = this.getNodeParameter('messageType', i) as string;

	let content: IDataObject = {};
	const text = this.getNodeParameter('text', i, '') as string;
	switch (messageType) {
		case 'text':
			content = {
				text: includeLinkToWorkflow ? `${text}\n${automatedMessage}` : text,
			};
			break;
		case 'block':
			content = jsonParse(this.getNodeParameter('blocksUi', i) as string);

			if (includeLinkToWorkflow && Array.isArray(content.blocks)) {
				content.blocks.push({
					type: 'section',
					text: {
						type: 'mrkdwn',
						text: automatedMessage,
					},
				});
			}
			if (text) {
				content.text = text;
			}
			break;
		case 'attachment':
			const attachmentsUI = this.getNodeParameter('attachments', i) as IDataObject[];

			const attachments: IDataObject[] = [];

			for (const attachment of attachmentsUI) {
				if (attachment.fields !== undefined) {
					if ((attachment?.fields as IDataObject)?.item) {
						attachment.fields = (attachment?.fields as IDataObject)?.item as IDataObject[];
					}
				}
				attachments.push(attachment);
			}

			content = { attachments } as IDataObject;

			if (includeLinkToWorkflow && Array.isArray(content.attachments)) {
				content.attachments.push({
					text: automatedMessage,
				});
			}
			break;
		default:
			throw new NodeOperationError(
				this.getNode(),
				`The message type "${messageType}" is not known!`,
			);
	}

	return content;
}

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