<?php
/*!
* HybridAuth
* http://hybridauth.sourceforge.net | http://github.com/hybridauth/hybridauth
* (c) 2009-2012, HybridAuth authors | http://hybridauth.sourceforge.net/licenses.html
*/

/**
 * Hybrid_Providers_Facebook provider adapter based on OAuth2 protocol
 *
 * Hybrid_Providers_Facebook use the Facebook PHP SDK created by Facebook
 *
 * http://hybridauth.sourceforge.net/userguide/IDProvider_info_Facebook.html
 */
class Hybrid_Providers_Facebook extends Hybrid_Provider_Model
{
    // default permissions, and alot of them. You can change them from the configuration by setting the scope to what you want/need
    public $scope = "email, user_about_me, user_birthday, user_hometown, user_website, read_stream, offline_access, publish_stream, read_friendlists";

    /**
    * IDp wrappers initializer
    */
    public function initialize()
    {
        if (! $this->config["keys"]["id"] || ! $this->config["keys"]["secret"]) {
            throw new Exception( "Your application id and secret are required in order to connect to {$this->providerId}.", 4 );
        }

        if ( ! class_exists('FacebookApiException', false) ) {
            require_once Hybrid_Auth::$config["path_libraries"] . "Facebook/base_facebook.php";
            require_once Hybrid_Auth::$config["path_libraries"] . "Facebook/facebook.php";
        }

        if ( isset ( Hybrid_Auth::$config["proxy"] ) ) {
            BaseFacebook::$CURL_OPTS[CURLOPT_PROXY] = Hybrid_Auth::$config["proxy"];
        }

        $this->api = new Facebook( ARRAY( 'appId' => $this->config["keys"]["id"], 'secret' => $this->config["keys"]["secret"] ) );

        if ( $this->token("access_token") ) {
            $this->api->setAccessToken( $this->token("access_token") );
            $this->api->setExtendedAccessToken();
            $access_token = $this->api->getAccessToken();

            if ($access_token) {
                $this->token("access_token", $access_token );
                $this->api->setAccessToken( $access_token );
            }

            $this->api->setAccessToken( $this->token("access_token") );
        }

        $this->api->getUser();
    }

    /**
    * begin login step
    *
    * simply call Facebook::require_login().
    */
    public function loginBegin()
    {
        $parameters = array("scope" => $this->scope, "redirect_uri" => $this->endpoint, "display" => "page");
        $optionals  = array("scope", "redirect_uri", "display");

        foreach ($optionals as $parameter) {
            if ( isset( $this->config[$parameter] ) && ! empty( $this->config[$parameter] ) ) {
                $parameters[$parameter] = $this->config[$parameter];
            }
        }

        // get the login url
        $url = $this->api->getLoginUrl( $parameters );

        // redirect to facebook
        Hybrid_Auth::redirect( $url );
    }

    /**
    * finish login step
    */
    public function loginFinish()
    {
        // in case we get error_reason=user_denied&error=access_denied
        if ( isset( $_REQUEST['error'] ) && $_REQUEST['error'] == "access_denied" ) {
            throw new Exception( "Authentication failed! The user denied your request.", 5 );
        }

        // try to get the UID of the connected user from fb, should be > 0
        if ( ! $this->api->getUser() ) {
            throw new Exception( "Authentication failed! {$this->providerId} returned an invalid user id.", 5 );
        }

        // set user as logged in
        $this->setUserConnected();

        // store facebook access token
        $this->token( "access_token", $this->api->getAccessToken() );
    }

    /**
    * logout
    */
    public function logout()
    {
        $this->api->destroySession();

        parent::logout();
    }

    /**
    * load the user profile from the IDp api client
    */
    public function getUserProfile()
    {
        // request user profile from fb api
        try {
            $data = $this->api->api('/me');
        } catch ( FacebookApiException $e ) {
            throw new Exception( "User profile request failed! {$this->providerId} returned an error: $e", 6 );
        }

        // if the provider identifier is not recived, we assume the auth has failed
        if ( ! isset( $data["id"] ) ) {
            throw new Exception( "User profile request failed! {$this->providerId} api returned an invalid response.", 6 );
        }

        # store the user profile.
        $this->user->profile->identifier    = (array_key_exists('id',$data))?$data['id']:"";
        $this->user->profile->displayName   = (array_key_exists('name',$data))?$data['name']:"";
        $this->user->profile->firstName     = (array_key_exists('first_name',$data))?$data['first_name']:"";
        $this->user->profile->lastName      = (array_key_exists('last_name',$data))?$data['last_name']:"";
        $this->user->profile->photoURL      = "https://graph.facebook.com/" . $this->user->profile->identifier . "/picture?width=150&height=150";
        $this->user->profile->profileURL    = (array_key_exists('link',$data))?$data['link']:"";
        $this->user->profile->webSiteURL    = (array_key_exists('website',$data))?$data['website']:"";
        $this->user->profile->gender        = (array_key_exists('gender',$data))?$data['gender']:"";
        $this->user->profile->description   = (array_key_exists('bio',$data))?$data['bio']:"";
        $this->user->profile->email         = (array_key_exists('email',$data))?$data['email']:"";
        $this->user->profile->emailVerified = (array_key_exists('email',$data))?$data['email']:"";
        $this->user->profile->region        = (array_key_exists("hometown",$data)&&array_key_exists("name",$data['hometown']))?$data['hometown']["name"]:"";

        if ( array_key_exists('birthday',$data) ) {
            list($birthday_month, $birthday_day, $birthday_year) = explode( "/", $data['birthday'] );

            $this->user->profile->birthDay   = (int) $birthday_day;
            $this->user->profile->birthMonth = (int) $birthday_month;
            $this->user->profile->birthYear  = (int) $birthday_year;
        }

        return $this->user->profile;
     }

    /**
    * load the user contacts
    */
    public function getUserContacts()
    {
        try {
            $response = $this->api->api('/me/friends');
        } catch ( FacebookApiException $e ) {
            throw new Exception( "User contacts request failed! {$this->providerId} returned an error: $e" );
        }

        if ( ! $response || ! count( $response["data"] ) ) {
            return ARRAY();
        }

        $contacts = ARRAY();

        foreach ($response["data"] as $item) {
            $uc = new Hybrid_User_Contact();

            $uc->identifier  = (array_key_exists("id",$item))?$item["id"]:"";
            $uc->displayName = (array_key_exists("name",$item))?$item["name"]:"";
            $uc->profileURL  = "https://www.facebook.com/profile.php?id=" . $uc->identifier;
            $uc->photoURL    = "https://graph.facebook.com/" . $uc->identifier . "/picture?width=150&height=150";

            $contacts[] = $uc;
        }

        return $contacts;
     }

    /**
    * update user status
    */
    public function setUserStatus( $status )
    {
        $parameters = array();

        if ( is_array( $status ) ) {
            $parameters = $status;
        } else {
            $parameters["message"] = $status;
        }

        try {
            $response = $this->api->api( "/me/feed", "post", $parameters );
        } catch ( FacebookApiException $e ) {
            throw new Exception( "Update user status failed! {$this->providerId} returned an error: $e" );
        }
     }

    /**
    * load the user latest activity
    *    - timeline : all the stream
    *    - me       : the user activity only
    */
    public function getUserActivity( $stream )
    {
        try {
            if ($stream == "me") {
                $response = $this->api->api( '/me/feed' );
            } else {
                $response = $this->api->api('/me/home');
            }
        } catch ( FacebookApiException $e ) {
            throw new Exception( "User activity stream request failed! {$this->providerId} returned an error: $e" );
        }

        if ( ! $response || ! count(  $response['data'] ) ) {
            return ARRAY();
        }

        $activities = ARRAY();

        foreach ($response['data'] as $item) {
            if ( $stream == "me" && $item["from"]["id"] != $this->api->getUser() ) {
                continue;
            }

            $ua = new Hybrid_User_Activity();

            $ua->id                 = (array_key_exists("id",$item))?$item["id"]:"";
            $ua->date               = (array_key_exists("created_time",$item))?strtotime($item["created_time"]):"";

            if ($item["type"] == "video") {
                $ua->text           = (array_key_exists("link",$item))?$item["link"]:"";
            }

            if ($item["type"] == "link") {
                $ua->text           = (array_key_exists("link",$item))?$item["link"]:"";
            }

            if ( empty( $ua->text ) && isset( $item["story"] ) ) {
                $ua->text           = (array_key_exists("link",$item))?$item["link"]:"";
            }

            if ( empty( $ua->text ) && isset( $item["message"] ) ) {
                $ua->text           = (array_key_exists("message",$item))?$item["message"]:"";
            }

            if ( ! empty( $ua->text ) ) {
                $ua->user->identifier   = (array_key_exists("id",$item["from"]))?$item["from"]["id"]:"";
                $ua->user->displayName  = (array_key_exists("name",$item["from"]))?$item["from"]["name"]:"";
                $ua->user->profileURL   = "https://www.facebook.com/profile.php?id=" . $ua->user->identifier;
                $ua->user->photoURL     = "https://graph.facebook.com/" . $ua->user->identifier . "/picture?type=square";

                $activities[] = $ua;
            }
        }

        return $activities;
     }
}
