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'use strict';
var assert = require('assert');
var _ = require('lodash');
var Separator = require('./separator');
var Choice = require('./choice');
/**
* Choices collection
* Collection of multiple `choice` object
* @constructor
* @param {Array} choices All `choice` to keep in the collection
*/
module.exports = class Choices {
constructor(choices, answers) {
this.choices = choices.map(val => {
if (val.type === 'separator') {
if (!(val instanceof Separator)) {
val = new Separator(val.line);
}
return val;
}
return new Choice(val, answers);
});
this.realChoices = this.choices
.filter(Separator.exclude)
.filter(item => !item.disabled);
Object.defineProperty(this, 'length', {
get() {
return this.choices.length;
},
set(val) {
this.choices.length = val;
}
});
Object.defineProperty(this, 'realLength', {
get() {
return this.realChoices.length;
},
set() {
throw new Error('Cannot set `realLength` of a Choices collection');
}
});
}
/**
* Get a valid choice from the collection
* @param {Number} selector The selected choice index
* @return {Choice|Undefined} Return the matched choice or undefined
*/
getChoice(selector) {
assert(_.isNumber(selector));
return this.realChoices[selector];
}
/**
* Get a raw element from the collection
* @param {Number} selector The selected index value
* @return {Choice|Undefined} Return the matched choice or undefined
*/
get(selector) {
assert(_.isNumber(selector));
return this.choices[selector];
}
/**
* Match the valid choices against a where clause
* @param {Object} whereClause Lodash `where` clause
* @return {Array} Matching choices or empty array
*/
where(whereClause) {
return _.filter(this.realChoices, whereClause);
}
/**
* Pluck a particular key from the choices
* @param {String} propertyName Property name to select
* @return {Array} Selected properties
*/
pluck(propertyName) {
return _.map(this.realChoices, propertyName);
}
// Expose usual Array methods
indexOf() {
return this.choices.indexOf.apply(this.choices, arguments);
}
forEach() {
return this.choices.forEach.apply(this.choices, arguments);
}
filter() {
return this.choices.filter.apply(this.choices, arguments);
}
find(func) {
return _.find(this.choices, func);
}
push() {
var objs = _.map(arguments, val => new Choice(val));
this.choices.push.apply(this.choices, objs);
this.realChoices = this.choices.filter(Separator.exclude);
return this.choices;
}
};
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