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'use strict'

//-------------------------------------------------------------------------------------------------

var mixin = require('./util/mixin'),

camelize = require('./util/camelize');

//-------------------------------------------------------------------------------------------------

function Config(options, StateMachine) {

options = options || {};

this.options = options; // preserving original options can be useful (e.g visualize plugin)

this.defaults = StateMachine.defaults;

this.states = [];

this.transitions = [];

this.map = {};

this.lifecycle = this.configureLifecycle();

this.init = this.configureInitTransition(options.init);

this.data = this.configureData(options.data);

this.methods = this.configureMethods(options.methods);

this.map[this.defaults.wildcard] = {};

this.configureTransitions(options.transitions || []);

this.plugins = this.configurePlugins(options.plugins, StateMachine.plugin);

}

//-------------------------------------------------------------------------------------------------

mixin(Config.prototype, {

addState: function(name) {

if (!this.map[name]) {

this.states.push(name);

this.addStateLifecycleNames(name);

this.map[name] = {};

}

},

addStateLifecycleNames: function(name) {

this.lifecycle.onEnter[name] = camelize.prepended('onEnter', name);

this.lifecycle.onLeave[name] = camelize.prepended('onLeave', name);

this.lifecycle.on[name] = camelize.prepended('on', name);

},

addTransition: function(name) {

if (this.transitions.indexOf(name) < 0) {

this.transitions.push(name);

this.addTransitionLifecycleNames(name);

}

},

addTransitionLifecycleNames: function(name) {

this.lifecycle.onBefore[name] = camelize.prepended('onBefore', name);

this.lifecycle.onAfter[name] = camelize.prepended('onAfter', name);

this.lifecycle.on[name] = camelize.prepended('on', name);

},

mapTransition: function(transition) {

var name = transition.name,

from = transition.from,

to = transition.to;

this.addState(from);

if (typeof to !== 'function')

this.addState(to);

this.addTransition(name);

this.map[from][name] = transition;

return transition;

},

configureLifecycle: function() {

return {

onBefore: { transition: 'onBeforeTransition' },

onAfter: { transition: 'onAfterTransition' },

onEnter: { state: 'onEnterState' },

onLeave: { state: 'onLeaveState' },

on: { transition: 'onTransition' }

};

},

configureInitTransition: function(init) {

if (typeof init === 'string') {

return this.mapTransition(mixin({}, this.defaults.init, { to: init, active: true }));

}

else if (typeof init === 'object') {

return this.mapTransition(mixin({}, this.defaults.init, init, { active: true }));

}

else {

this.addState(this.defaults.init.from);

return this.defaults.init;

}

},

configureData: function(data) {

if (typeof data === 'function')

return data;

else if (typeof data === 'object')

return function() { return data; }

else

return function() { return {}; }

},

configureMethods: function(methods) {

return methods || {};

},

configurePlugins: function(plugins, builtin) {

plugins = plugins || [];

var n, max, plugin;

for(n = 0, max = plugins.length ; n < max ; n++) {

plugin = plugins[n];

if (typeof plugin === 'function')

plugins[n] = plugin = plugin()

if (plugin.configure)

plugin.configure(this);

}

return plugins

},

configureTransitions: function(transitions) {

var i, n, transition, from, to, wildcard = this.defaults.wildcard;

for(n = 0 ; n < transitions.length ; n++) {

transition = transitions[n];

from = Array.isArray(transition.from) ? transition.from : [transition.from || wildcard]

to = transition.to || wildcard;

for(i = 0 ; i < from.length ; i++) {

this.mapTransition({ name: transition.name, from: from[i], to: to });

}

}

},

transitionFor: function(state, transition) {

var wildcard = this.defaults.wildcard;

return this.map[state][transition] ||

this.map[wildcard][transition];

},

transitionsFor: function(state) {

var wildcard = this.defaults.wildcard;

return Object.keys(this.map[state]).concat(Object.keys(this.map[wildcard]));

},

allStates: function() {

return this.states;

},

allTransitions: function() {

return this.transitions;

}

});

//-------------------------------------------------------------------------------------------------

module.exports = Config;

//-------------------------------------------------------------------------------------------------