<?php

/**
 * Settings extension for managing view-related settings.
 *
 * @author     Time.ly Network, Inc.
 * @since      2.0
 * @package    Ai1EC
 * @subpackage Ai1EC.Model
 */
class Ai1ec_Settings_View extends Ai1ec_App {

    /**
     * @var string Name of settings option to use for views map.
     */
    const SETTING_VIEWS_MAP = 'enabled_views';

    /**
     * @var Ai1ec_Settings Instance
     */
    protected $_settings = null;

    /**
     * Acquire Settings model instance for future reference.
     *
     * @return void
     */
    protected function _initialize() {
        $this->_settings = $this->_registry->get( 'model.settings' );
    }

    /**
     * Add a view if not set.
     *
     * @param array $view
     */
    public function add( array $view ) {
        $enabled_views = $this->_get();
        if ( isset( $enabled_views[$view['name']] ) ) {
            if ( $enabled_views[$view['name']]['longname'] === $view['longname'] ) {
                return;
            }
            $enabled_views[$view['name']]['longname'] = $view['longname'];
        } else {
            // Copy relevant settings to local view array; account for possible missing
            // mobile settings during upgrade (assign defaults).
            $enabled_views[$view['name']] = array(
                'enabled'        => $view['enabled'],
                'default'        => $view['default'],
                'enabled_mobile' => isset( $view['enabled_mobile'] ) ?
                                    $view['enabled_mobile'] : $view['enabled'],
                'default_mobile' => isset( $view['default_mobile'] ) ?
                                    $view['default_mobile'] : $view['default'],
                'longname'       => $view['longname'],
            );
        }
        $this->_set( $enabled_views );
    }

    /**
     * Remove a view.
     *
     * @param string $view
     */
    public function remove( $view ) {
        $enabled_views = $this->_get();
        if ( isset( $enabled_views[$view] ) ) {
            unset( $enabled_views[$view] );
            $this->_set( $enabled_views );
        }
    }

    /**
     * Retrieve all configured views.
     *
     * @return array Map of configured view aliases and their details.
     */
    public function get_all() {
        return $this->_get();
    }

    /**
     * Get name of view to be rendered for requested alias.
     *
     * @param string $view Name of view requested.
     *
     * @return string Name of view to be rendered.
     *
     * @throws Ai1ec_Settings_Exception If no views are configured.
     */
    public function get_configured( $view ) {
        $enabled_views = $this->_get();
        if ( empty( $enabled_views ) ) {
            throw new Ai1ec_Settings_Exception( 'No view is enabled' );
        }
        if (
            isset( $enabled_views[$view] ) &&
            $enabled_views[$view]['enabled' . ( wp_is_mobile() ? '_mobile' : '' ) ]
        ) {
            return $view;
        }
        return $this->get_default();
    }

    /**
     * Get default view to render.
     *
     *
     * @return
     */
    public function get_default() {
        $enabled_views = $this->_get();
        $default       = null;
        // Check mobile settings first, if in mobile mode.
        if (
            ! $this->_registry->get( 'compatibility.cli' )->is_cli() &&
            wp_is_mobile()
        ) {
            foreach ( $enabled_views as $view => $details ) {
                if (
                    isset( $details['default_mobile'] ) &&
                    $details['default_mobile'] &&
                    $details['enabled_mobile']
                ) {
                    $default = $view;
                    break;
                }
            }
        }
        // Either not in mobile mode or no mobile settings available; look up
        // desktop settings.
        if ( null === $default ) {
            foreach ( $enabled_views as $view => $details ) {
                if ( $details['default'] && $details['enabled'] ) {
                    $default = $view;
                    break;
                }
            }
        }
        // No enabled view found, but we need to pick one, so pick the first view.
        if ( null === $default ) {
            $default = (string)current( array_keys( $enabled_views ) );
        }
        return $default;
    }

    /**
     * Retrieve views maps from storage.
     *
     * @return array Current views map.
     */
    protected function _get() {
        return (array)$this->_settings->get( self::SETTING_VIEWS_MAP, array() );
    }

    /**
     * Update views map.
     *
     * @param array $enabled_views Map of enabled views.
     *
     * @return bool Success.
     */
    protected function _set( array $enabled_views ) {
        return $this->_settings->set( self::SETTING_VIEWS_MAP, $enabled_views );
    }

}