enigma-bbs/core/menu_stack.js

192 lines
4.5 KiB
JavaScript

/* jslint node: true */
'use strict';
// ENiGMA½
const loadMenu = require('./menu_util.js').loadMenu;
const Errors = require('./enig_error.js').Errors;
// deps
const _ = require('lodash');
const assert = require('assert');
// :TODO: Stack is backwards.... top should be most recent! :)
module.exports = class MenuStack {
constructor(client) {
this.client = client;
this.stack = [];
}
push(moduleInfo) {
return this.stack.push(moduleInfo);
}
pop() {
return this.stack.pop();
}
peekPrev() {
if(this.stackSize > 1) {
return this.stack[this.stack.length - 2];
}
}
top() {
if(this.stackSize > 0) {
return this.stack[this.stack.length - 1];
}
}
get stackSize() {
return this.stack.length;
}
get currentModule() {
const top = this.top();
if(top) {
return top.instance;
}
}
next(cb) {
const currentModuleInfo = this.top();
assert(currentModuleInfo, 'Empty menu stack!');
const menuConfig = currentModuleInfo.instance.menuConfig;
const nextMenu = this.client.acs.getConditionalValue(menuConfig.next, 'next');
if(!nextMenu) {
return cb(Array.isArray(menuConfig.next) ?
Errors.MenuStack('No matching condition for "next"', 'NOCONDMATCH') :
Errors.MenuStack('Invalid or missing "next" member in menu config', 'BADNEXT')
);
}
if(nextMenu === currentModuleInfo.name) {
return cb(Errors.MenuStack('Menu config "next" specifies current menu', 'ALREADYTHERE'));
}
this.goto(nextMenu, { }, cb);
}
prev(cb) {
const menuResult = this.top().instance.getMenuResult();
// :TODO: leave() should really take a cb...
this.pop().instance.leave(); // leave & remove current
const previousModuleInfo = this.pop(); // get previous
if(previousModuleInfo) {
const opts = {
extraArgs : previousModuleInfo.extraArgs,
savedState : previousModuleInfo.savedState,
lastMenuResult : menuResult,
};
return this.goto(previousModuleInfo.name, opts, cb);
}
return cb(Errors.MenuStack('No previous menu available', 'NOPREV'));
}
goto(name, options, cb) {
const currentModuleInfo = this.top();
if(!cb && _.isFunction(options)) {
cb = options;
options = {};
}
options = options || {};
const self = this;
if(currentModuleInfo && name === currentModuleInfo.name) {
if(cb) {
cb(Errors.MenuStack('Already at supplied menu', 'ALREADYTHERE'));
}
return;
}
const loadOpts = {
name : name,
client : self.client,
};
if(currentModuleInfo && currentModuleInfo.menuFlags.includes('forwardArgs')) {
loadOpts.extraArgs = currentModuleInfo.extraArgs;
} else {
loadOpts.extraArgs = options.extraArgs || _.get(options, 'formData.value');
}
loadOpts.lastMenuResult = options.lastMenuResult;
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');
//
// If menuFlags were supplied in menu.hjson, they should win over
// anything supplied in code.
//
let menuFlags;
if(0 === modInst.menuConfig.options.menuFlags.length) {
menuFlags = Array.isArray(options.menuFlags) ? options.menuFlags : [];
} else {
menuFlags = modInst.menuConfig.options.menuFlags;
// in code we can ask to merge in
if(Array.isArray(options.menuFlags) && options.menuFlags.includes('mergeFlags')) {
menuFlags = _.uniq(menuFlags.concat(options.menuFlags));
}
}
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
}
}
self.push({
name : name,
instance : modInst,
extraArgs : loadOpts.extraArgs,
menuFlags : menuFlags,
});
// restore previous state if requested
if(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;
});
self.client.log.trace( { stack : stackEntries }, 'Updated menu stack' );
modInst.enter();
if(cb) {
cb(null);
}
}
});
}
};