/*
 * Store which manages and persists site information
 */

var AppDispatcher = require('../dispatcher/app-dispatcher'),
  EventEmitter = require('events').EventEmitter,
  JPSConstants = require('../constants/jetpack-start-constants'),
  WPAjax = require('../utils/wp-ajax');

var CHANGE_EVENT = 'change';

var layout = JPS.steps.layout.current;

function setTitle(newTitle) {
	JPS.bloginfo.name = newTitle;
}

function setDescription(newDescription) {
  JPS.bloginfo.description = newDescription; 
}

function setActiveTheme(activeThemeId) {
  JPS.themes.forEach( function( theme ) {
    if ( theme.id == activeThemeId ) {
      theme.active = true;
    } else {
      theme.active = false;
    }
  } );
}

function installedTheme(theme) {
  JPS.themes.unshift(theme);
  JPS.themes = JPS.themes.slice(0, 3);
}

function setJetpackModuleActivated(slug) {
  if ( _.indexOf( JPS.jetpack.active_modules, slug ) === -1 ) {
    JPS.jetpack.active_modules.push(slug);  
  }
}

function setJetpackModuleDectivated(slug) {
  var index = _.indexOf( JPS.jetpack.active_modules, slug );
  if ( index >= 0) {
    JPS.jetpack.active_modules.splice(index, 1);
  }
}

function setJetpackAdditionalModules(modules) {
  JPS.jetpack.additional_modules = _.filter(modules, function(module) {
    return _.indexOf(JPS.jetpack.jumpstart_modules.map(function(mod){return mod.slug;}), module.slug) == -1;
  });
}

function setLayout(layoutName) {
  layout = layoutName; // XXX TODO: get this value dynamically from the server!
}

function setJetpackConfigured() {
  JPS.jetpack.configured = true;
}

function setJetpackJumpstartActivated() {
  JPS.jetpack.jumpstart_modules.forEach( function( module ) {
    setJetpackModuleActivated( module.slug );
  });
}

var SiteStore = _.extend({}, EventEmitter.prototype, {

  getTitle: function() {
  	return JPS.bloginfo.name;
  },

  getDescription: function() {
    return JPS.bloginfo.description;
  },

  getThemes: function() {
    return JPS.themes;
  },

  getActiveThemeId: function() {
    for(var i=0; i < JPS.themes.length; i++) {
      var theme = JPS.themes[i];
      if ( theme.active ) {
        return theme.id;
      }
    }
    return null;
  },

  getJetpackConfigured: function() {
    return JPS.jetpack.configured;
  },

  getActiveModuleSlugs: function() {
    return JPS.jetpack.active_modules;
  },

  isJetpackModuleEnabled: function(slug) {
    return ( _.indexOf( JPS.jetpack.active_modules, slug ) >= 0 );
  },

  getJetpackAdditionalModules: function() {
    return JPS.jetpack.additional_modules;
  },

  getJumpstartModuleSlugs: function() {
    return JPS.jetpack.jumpstart_modules.map(function(module) { return module.slug; });
  },

  getJumpstartModules: function() {
    return JPS.jetpack.jumpstart_modules;
  },

  getPopularThemes: function() {
    return WPAjax.post(JPS.site_actions.get_popular_themes);
  },

  getJetpackJumpstartEnabled: function() {
    for(var i=0; i < JPS.jetpack.jumpstart_modules.length; i++) {
      var module = JPS.jetpack.jumpstart_modules[i];
      if ( ! this.isJetpackModuleEnabled( module.slug ) ) {
        return false;
      }
    }
    return true;
  },

  getLayout: function() {
    return layout;
  },

  emitChange: function() {
    this.emit(CHANGE_EVENT);
  },

  addChangeListener: function(callback) {
    this.on(CHANGE_EVENT, callback);
  },

  removeChangeListener: function(callback) {
    this.removeListener(CHANGE_EVENT, callback);
  }
});

// Register callback to handle all updates
AppDispatcher.register(function(action) {

  switch(action.actionType) {
    case JPSConstants.SITE_SET_TITLE:
      setTitle(action.title);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_SET_DESCRIPTION:
      setDescription(action.description);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_SET_THEME:
      setActiveTheme(action.themeId);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_INSTALL_THEME:
      installedTheme(action.theme);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_JETPACK_CONFIGURED:
      setJetpackConfigured();
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_JETPACK_ADD_MODULES:
      setJetpackAdditionalModules(action.modules);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_JETPACK_MODULE_ENABLED:
      setJetpackModuleActivated(action.slug);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_JETPACK_MODULE_DISABLED:
      setJetpackModuleDectivated(action.slug);
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_JETPACK_JUMPSTART_ENABLED: 
      setJetpackJumpstartActivated();
      SiteStore.emitChange();
      break;

    case JPSConstants.SITE_SET_LAYOUT:
      setLayout(action.layout);
      SiteStore.emitChange();
      break;

    default:
      // no op
  }
});

module.exports = SiteStore;