Boundaries.js

'use strict';

const fs = require('fs');

function Boundaries (definition) {
	this.boundaryDefinition = definition;
};

Boundaries.prototype.writeFiles = function(duration, directory, cb) {
	var writeRequirements = [];
	var writeSatisfied = 0;
	var writeComplete = function (err) {
		writeSatisfied++;
		if (err) {
			cb(err);
		} else {
			if (!writeRequirements.length) {
				cb(false);
			} else {
				(writeRequirements.shift())();
			}
		}
	};
	
	if (this.boundaryDefinition.rainfallIntensity) {
		writeRequirements.push(this.writeFilesRainfall.bind(this, duration, directory, writeComplete));
	}
	
	if (this.boundaryDefinition.drainageRate) {
		writeRequirements.push(this.writeFilesDrainage.bind(this, duration, directory, writeComplete));
	}
	
	writeComplete(false);
}

Boundaries.prototype.hasDrainage = function() {
	return !!this.boundaryDefinition.drainageRate;
}

Boundaries.prototype.hasRainfall = function() {
	return !!this.boundaryDefinition.rainfallIntensity;
}

Boundaries.prototype.writeFilesRainfall = function(duration, directory, cb) {
	console.log('    Attempting to write rainfall intensity boundary.');
	fs.writeFile(
		directory + '/rainfall.csv',
		this.getRainfall(duration),
		cb
	);
}

Boundaries.prototype.writeFilesDrainage = function(duration, directory, cb) {
	console.log('    Attempting to write drainage boundary.');
	fs.writeFile(
		directory + '/drainage.csv',
		this.getDrainage(duration),
		cb
	);
}

Boundaries.prototype.getRainfall = function(duration) {
	let csvHeader = 'Time (s),Rainfall intensity (mm/hr)\n';
	let csvLines = '';
	for (let csvTime = 0.0; csvTime <= duration; csvTime += this.boundaryDefinition.rainfallDuration) {
		csvLines += csvTime + ',' + (csvTime < this.boundaryDefinition.rainfallDuration ? this.boundaryDefinition.rainfallIntensity : 0.0) + '\n';
	}
	return csvHeader + csvLines;
}

Boundaries.prototype.getDrainage = function(duration) {
	let csvHeader = 'Time (s),Drainage rate (mm/hr)\n';
	let csvLines = '';
	csvLines += '0.0,' + this.boundaryDefinition.drainageRate + '\n';
	csvLines += duration + ',' + this.boundaryDefinition.drainageRate + '\n'
	return csvHeader + csvLines;
}

module.exports = Boundaries;