"use strict";

const Promise = require("bluebird");
const pEvent = require("p-event");
const debug = require("debug")("promistream:from-node-stream:writable");

const objectID = require("../object-id");
const isStdioStream = require("../is-stdio-stream");

module.exports = function writeToStream(stream, value) {
	if (!isStdioStream(stream)) {
		let canWriteMore = stream.write(value);

		if (canWriteMore) {
			debug(`[#${objectID(stream)}] Stream can accept more data`);
			return;
		} else {
			debug(`[#${objectID(stream)}] Stream is backed up, waiting for drain event...`);

			return Promise.try(() => {
				return pEvent(stream, "drain");
			}).then(() => {
				debug(`[#${objectID(stream)}] Drain event received`);
			});
		}
	} else {
		// NOTE: According to the `stream-to-pull-stream` code, stdout/stderr behave differently from normal streams, and the `drain` event doesn't work correctly there. So instead, we use the flush callback to know when to write the next bit of data.
		return new Promise((resolve, _reject) => {
			stream.write(value, (_error) => {
				// NOTE: We ignore any errors here, and wait for them to be thrown in the `error` event, to simplify the logic.
				resolve();
			});
		});
	}
};