/*
	file: 	letter.js
	desc: 	simple script that generates a (skeleton) letter
			based on Christopher Stratchey's Love Letter as 
			analysed by Noah Wardrip-Fruin in "Digital Media Archeology"
	author: gauthier
	date: 	11/11/16
*/

// import chance (http://chancejs.com)
var chance = require('chance').Chance(); // npm install --save chance

// import word-wrap (https://www.npmjs.com/package/word-wrap)
var wrap = require('word-wrap'); // npm install --save word-wrap

// Stratchey's Love letter vocabulary database 
// based on Noah Wardrip-Fruin's "Digital Media Archeology" Table 14.1
const first = ['DARLING', 'DEAR', 'HONEY', 'JEWEL'];

const second = ['DUCK', 'LOVE', 'MOPPET', 'SWEETHEART'];

const adjectives = ['ADORABLE', 'AFFECTIONATE', 'AMOROUS', 'ANXIOUS', 'ARDENT', 'AVID', 'BREATHLESS', 'BURNING', 'COVETOUS', 'CRAVING', 'CURIOUS', 'DARLING', 'DEAR', 'DEVOTED', 'EAGER', 'EROTIC', 'FERVENT', 'FOND', 'IMPATIENT', 'KEEN', 'LITTLE', 'LOVEABLE', 'LOVESICK', 'LOVING', 'PASSIONATE', 'PRECIOUS', 'SWEET', 'SYMPATHETIC', 'TENDER', 'UNSATISFIED', 'WISTFUL'];

const nouns = ['ADORATION', 'AFFECTION', 'AMBITION', 'APPETITE', 'ARDOUR', 'CHARM', 'DESIRE', 'DEVOTION', 'EAGERNESS', 'ENCHANTMENT', 'ENTHUSIASM', 'FANCY', 'FELLOW FEELING', 'FERVOUR', 'FONDNESS', 'HEART', 'HUNGER', 'INFATUATION', 'LIKING', 'LONGING', 'LOVE', 'LUST', 'PASSION', 'RAPTURE', 'SYMPATHY', 'TENDERNESS', 'THIRST', 'WISH', 'YEARNING'];

const adverbs = ['AFFECTIONATELY', 'ANXIOUSLY', 'ARDENTLY', 'AVIDLY', 'BEAUTIFULLY', 'BREATHLESSLY', 'BURNINGLY', 'COVETOUSLY', 'CURIOUSLY', 'DEVOTEDLY', 'EAGERLY', 'FERVENTLY', 'FONDLY', 'IMPATIENTLY', 'KEENLY', 'LOVINGLY', 'PASSIONATELY', 'SEDUCTIVELY', 'TENDERLY', 'WINNINGLY', 'WISTFULLY'];

const verbs = ['ADORES', 'ATTRACTS', 'CARES FOR', 'CHERISHES', 'CLINGS TO', 'DESIRES','HOLDS DEAR', 'HOPES FOR', 'HUNGERS FOR', 'IS WEDDED TO', 'LIKES', 'LONGS FOR', 'LOVES', 'LUSTS AFTER', 'PANTS FOR', 'PINES FOR', 'PRIZES', 'SIGHS FOR', 'TEMPTS', 'THIRSTS FOR', 'TREASURES', 'WANTS', 'WISHES', 'WOOS', 'YEARNS FOR'];


/**
*	Picks a random element from an array
*	@param {Array} array
*	@return {Object} choice
*/
function choice(array) {
	var index = chance.natural({'min': 0, 'max': array.length - 1});
	return array[index];
}

/**
*	Randomly picks or not a random element from an array
*	@param {Array} array
*	@return {Object} choice 
* 	@return {String} empty string
*/
function maybe(array) {
	if( chance.bool() ) {
		return choice(array);
	} else {
		return '';
	}
}

/**
*	Generates a short phrase consisting of a randomly chosen 
*	adjective and noun
*	@return {String} phrase
*/
function short() {
	return choice(adjectives) + ' ' + choice(nouns);
}

/**
*	Generates a sentence composed of randomly chosen 
*	adjective, noun, adverb, verb, adjective and noun
*	@return {String} sentence
*/
function long() {
	return 'MY ' + maybe(adjectives) + ' ' + choice(nouns) + ' ' +
					maybe(adverbs) + ' ' + choice(verbs) + ' ' +
					'YOUR ' + maybe(adjectives) + ' ' + choice(nouns) + '. ';
}

// format the output (header)
console.log('\n\n\n\n'); 	// 4 x newline ('\n')

// in order to use word-wrap, I need to construct a single string
// (text) containing all generated sentences
var text = '';

// loop generating 5 sentences
for(var i = 0; i < 5; i++) {

	// concatenate the new sentence generated by long() with the text string
	text += long();	// (+=) text = text + long()
}

// wrap the text with a width of 65 characters and log (output) it to the console
console.log(wrap(text, {'width': 65}));

// format for the output (footer)
console.log('\n\n\n\n');	// 4 x newline ('\n')