enigma-bbs/core/menu_stack.js

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/* jslint node: true */
'use strict';
// ENiGMA½
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const loadMenu = require('./menu_util.js').loadMenu;
const Errors = require('./enig_error.js').Errors;
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// deps
const _ = require('lodash');
const assert = require('assert');
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// :TODO: Stack is backwards.... top should be most recent! :)
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module.exports = class MenuStack {
constructor(client) {
this.client = client;
this.stack = [];
}
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push(moduleInfo) {
return this.stack.push(moduleInfo);
}
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pop() {
return this.stack.pop();
}
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peekPrev() {
if(this.stackSize > 1) {
return this.stack[this.stack.length - 2];
}
}
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top() {
if(this.stackSize > 0) {
return this.stack[this.stack.length - 1];
}
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}
get stackSize() {
return this.stack.length;
}
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get currentModule() {
const top = this.top();
if(top) {
return top.instance;
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}
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}
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next(cb) {
const currentModuleInfo = this.top();
assert(currentModuleInfo, 'Empty menu stack!');
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const menuConfig = currentModuleInfo.instance.menuConfig;
let nextMenu;
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if(_.isArray(menuConfig.next)) {
nextMenu = this.client.acs.getConditionalValue(menuConfig.next, 'next');
if(!nextMenu) {
return cb(Errors.MenuStack('No matching condition for "next"', 'NOCONDMATCH'));
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}
} else if(_.isString(menuConfig.next)) {
nextMenu = menuConfig.next;
} else {
return cb(Errors.MenuStack('Invalid or missing "next" member in menu config', 'BADNEXT'));
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}
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if(nextMenu === currentModuleInfo.name) {
return cb(Errors.MenuStack('Menu config "next" specifies current menu', 'ALREADYTHERE'));
}
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this.goto(nextMenu, { }, cb);
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}
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prev(cb) {
const menuResult = this.top().instance.getMenuResult();
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// :TODO: leave() should really take a cb...
this.pop().instance.leave(); // leave & remove current
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const previousModuleInfo = this.pop(); // get previous
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if(previousModuleInfo) {
const opts = {
extraArgs : previousModuleInfo.extraArgs,
savedState : previousModuleInfo.savedState,
lastMenuResult : menuResult,
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};
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return this.goto(previousModuleInfo.name, opts, cb);
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}
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return cb(Errors.MenuStack('No previous menu available', 'NOPREV'));
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}
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goto(name, options, cb) {
const currentModuleInfo = this.top();
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if(!cb && _.isFunction(options)) {
cb = options;
options = {};
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}
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const self = this;
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if(currentModuleInfo && name === currentModuleInfo.name) {
if(cb) {
cb(Errors.MenuStack('Already at supplied menu', 'ALREADYTHERE'));
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}
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return;
}
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const loadOpts = {
name : name,
client : self.client,
};
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if(_.isObject(options)) {
loadOpts.extraArgs = options.extraArgs;
loadOpts.lastMenuResult = options.lastMenuResult;
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}
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loadMenu(loadOpts, (err, modInst) => {
if(err) {
// :TODO: probably should just require a cb...
const errCb = cb || self.client.defaultHandlerMissingMod();
errCb(err);
} else {
self.client.log.debug( { menuName : name }, 'Goto menu module');
const menuFlags = (options && Array.isArray(options.menuFlags)) ? options.menuFlags : modInst.menuConfig.options.menuFlags;
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if(currentModuleInfo) {
// save stack state
currentModuleInfo.savedState = currentModuleInfo.instance.getSaveState();
currentModuleInfo.instance.leave();
if(currentModuleInfo.menuFlags.includes('noHistory')) {
this.pop();
}
if(menuFlags.includes('popParent')) {
this.pop().instance.leave(); // leave & remove current
}
}
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self.push({
name : name,
instance : modInst,
extraArgs : loadOpts.extraArgs,
menuFlags : menuFlags,
});
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// restore previous state if requested
if(options && options.savedState) {
modInst.restoreSavedState(options.savedState);
}
const stackEntries = self.stack.map(stackEntry => {
let name = stackEntry.name;
if(stackEntry.instance.menuConfig.options.menuFlags.length > 0) {
name += ` (${stackEntry.instance.menuConfig.options.menuFlags.join(', ')})`;
}
return name;
});
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self.client.log.trace( { stack : stackEntries }, 'Updated menu stack' );
modInst.enter();
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if(cb) {
cb(null);
}
}
});
}
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};