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<?php

require_once __DIR__."/../utils/ArrayUtil.php";
require_once __DIR__."/../plugin/SwagPlugin.php";
require_once __DIR__."/../model/SwagPostItem.php";

use swag\ArrayUtil;

/**
 * Represents a Swagpath.
 * Has an underlying post of the "swagpath" post type.
 */
class Swagpath {

    private $post;
    private $swagPostItems;
    private $relatedStatementsByEmail;

    private static $swagpathById=array();
    private static $swagpathBySlug=array();
    private static $all=array();

    /**
     * Construct.
     */
    private function __construct($post) {
        $this->post=$post;
        $this->relatedStatementsByEmail=array();
        $this->swagPostItems=NULL;

        Swagpath::$swagpathById[$post->ID]=$this;
        Swagpath::$swagpathBySlug[$post->post_name]=$this;
    }

    /**
     * Get id.
     */
    public function getId() {
        return $this->getPost()->ID;
    }

    /**
     * Get display color.
     */
    public function getDisplayColor() {
        $track=$this->getTrack();

        if (!$track)
            return SwagTrack::DEFAULT_COLOR;

        return $track->getDisplayColor();
    }

    /**
     * Get track.
     */
    public function getTrack() {
        $trackIds=wp_get_object_terms($this->post->ID,"swagtrack");
        if (!$trackIds)
            return NULL;

        return SwagTrack::getById($trackIds[0]);
    }

    /**
     * Get slug for top level track.
     */
    public function getTopLevelTrack() {
        $tracks=wp_get_object_terms($this->post->ID,"swagtrack");
        if (!$tracks)
            return NULL;

        $track=$tracks[0];
        while ($track->parent)
            $track=get_term($track->parent);

        return $track->slug;
    }

    /**
     * Get underlying post.
     */
    public function getPost() {
        return $this->post;
    }

    /**
     * Get lesson plan url, if any.
     */
    public function getLessonPlanUrl() {
        $lessonPlanPostId=get_post_meta($this->post->ID,"lessonplan",TRUE);
        if (!$lessonPlanPostId)
            return NULL;

        return wp_get_attachment_url($lessonPlanPostId);
    }

    /**
     * Get items.
     */
    public function getSwagPostItems() {
        if (!is_array($this->swagPostItems)) {
            $this->swagPostItems=array();

            $swagifactSlugs=get_post_meta($this->post->ID,"swagifact",TRUE);
            foreach ($swagifactSlugs as $swagifactSlug) {
                $parts=explode(":",$swagifactSlug);
                $type=$parts[0];
                $slug=$parts[1];

                $item=SwagPostItem::create($type,$slug);
                
                if ($item) {
                    $item->setSwagPost($this);
                    $item->setIndex(sizeof($this->swagPostItems));
                    $this->swagPostItems[]=$item;
                }
            }
        }

        return $this->swagPostItems;
    }

    /**
     * Get selected item based on $_REQUEST["tab"]
     */
    public function getSelectedItem() {
        $tab=intval($_REQUEST["tab"]);
        $swagPostItems=$this->getSwagPostItems();
        return $swagPostItems[$tab];
    }

    /**
     * Get prerequisite swagpaths.
     */
    public function getPrerequisites() {
        $prerequisites=array();

        $slugs=ArrayUtil::flattenArray(get_post_meta($this->post->ID,"prerequisites"));
        foreach ($slugs as $slug) {
            $swagpath=Swagpath::getBySlug($slug);

            if ($swagpath)
                $prerequisites[]=$swagpath;
        }

        return $prerequisites;
    }

    /**
     * Get the current swag path, created from the current
     * Wordpress post.
     */
    public static function getCurrent() {
        static $current;

        if (!$current) {
            $post=get_post();
            if ($post->post_type!="swagpath")
                throw new Exception("Current post is not a swagpath.");

            $current=new Swagpath($post);
        }

        return $current;
    }

    /**
     * Get related statements for the given user.
     */
    public function getRelatedStatements($swagUser) {
        $email=$swagUser->getEmail();

        if (array_key_exists($email,$this->relatedStatementsByEmail))
            return $this->relatedStatementsByEmail[$email];

        $xapi=SwagPlugin::instance()->getXapi();
        if (!$xapi)
            return array();

        $this->relatedStatementsByEmail[$email]=$xapi->getStatements(array(
            "agentEmail"=>$swagUser->getEmail(),
            "activity"=>get_permalink($this->getPost()->ID),
//          "verb"=>"http://adlnet.gov/expapi/verbs/completed",
            "related_activities"=>"true"
        ));

        return $this->relatedStatementsByEmail[$email];
    }

    /**
     * Get object id.
     */
    public function getXapiObjectId() {
        return "http://swag.tunapanda.org/".$this->post->post_name;
    }

    /**
     * Is the current user prepared for the prerequisites?
     */
    public function isCurrentUserPreparedForPrerequisites() {
        if ($this->isCompletedByCurrentUser())
            return TRUE;

        if ($this->isCurrentUserPrepared())
            return TRUE;

        foreach ($this->getPrerequisites() as $p)
            if (!$p->isCurrentUserPrepared())
                return FALSE;

        return TRUE;
    }

    /**
     * Does the current user have all prerequisites?
     */
    public function isCurrentUserPrepared() {
        if ($this->isCompletedByCurrentUser())
            return TRUE;

        foreach ($this->getPrerequisites() as $p)
            if (!$p->isCompletedByCurrentUser())
                return FALSE;

        return TRUE;
    }

    /**
     * Is this swagpath completed by the user?
     */
    public function isCompletedByUser($swagUser) {
        return $swagUser->isSwagpathCompleted($this);
    } 

    /**
     * Is this swagpath completed by the current user?
     */
    public function isCompletedByCurrentUser() {
        return SwagUser::getCurrent()->isSwagpathCompleted($this);
    }

    /**
     * Get by track id.
     */
    public static function getByTrackId($parentTrackId) {
        if ($parentTrackId) {
            $q=new WP_Query(array(
                "post_type"=>"swagpath",
                "tax_query"=>array(
                    array(
                        "taxonomy"=>"swagtrack",
                        "include_children"=>false,
                        "field"=>"term_id",
                        "terms"=>$parentTrackId
                    )
                ),
                "posts_per_page"=>-1
            ));
        }

        else {
            $notTerms=get_terms(array(
                'taxonomy'=>'swagtrack',
                'hide_empty'=>false,
                "fields"=>'ids'
            ));

            $q=new WP_Query(array(
                "post_type"=>"swagpath",
                "tax_query"=>array(
                    array(
                        "taxonomy"=>"swagtrack",
                        "include_children"=>false,
                        "field"=>"term_id",
                        "terms"=>$notTerms,
                        "operator"=>"NOT IN"
                    )
                ),
                "posts_per_page"=>-1
            ));
        }

        $posts=$q->get_posts();
        $res=array();
        foreach ($posts as $post)
            $res[]=new Swagpath($post);

        return $res;
    }

    /**
     * Get Swagpath by id.
     */
    public static function getById($postId) {
        if (!$postId)
            return NULL;

        if (isset(Swagpath::$swagpathById[$postId]))
            return Swagpath::$swagpathById[$postId];

        $post=get_post($postId);

        if (!$post)
            return NULL;

        if ($post->post_type!="swagpath")
            throw new Exception("This is not a swagpath post.");

        return new Swagpath($post);
    }

    /**
     * Get Swagpath by slug.
     */
    public static function getBySlug($slug) {
        if (isset(Swagpath::$swagpathBySlug[$slug]))
            return Swagpath::$swagpathBySlug[$slug];

        $posts=get_posts(array(
            'name'=>$slug,
            'post_type'=>'swagpath',
            'post_status'=>'publish',
            'numberposts'=>1
        ));

        if (!$posts)
            return NULL;

        return new Swagpath($posts[0]);
    }

    /**
     * Find all for a certain top level track.
     */
    public static function findAllForTopLevelTrack($slug) {
        $all=Swagpath::findAll();

        $res=array();
        foreach ($all as $swagpath)
            if ($swagpath->getTopLevelTrack()==$slug)
                $res[]=$swagpath;

        return $res;
    }

    /**
     * Find all swagpaths.
     */
    public static function findAll() {
        if (Swagpath::$all)
            return Swagpath::$all;

        $q=new WP_Query(array(
            "post_type"=>"swagpath",
            "post_status"=>"publish",
            "posts_per_page"=>-1
        ));

        Swagpath::$all=array();
        foreach ($q->get_posts() as $post)
            Swagpath::$all[]=new Swagpath($post);

        return Swagpath::$all;
    }

    /**
     * Save xapi statements for provided swag for current user.
     * If there is already a matching statement, a new one will
     * not be saved.
     */
    public function saveProvidedSwag($swagUser) {
        $xapi=SwagPlugin::instance()->getXapi();
        if (!$xapi)
            return array();

        $current=$xapi->getStatements(array(
            "agentEmail"=>$swagUser->getEmail(),
            "activity"=>$this->getXapiObjectId(),
            "verb"=>"http://adlnet.gov/expapi/verbs/completed",
        ));

        if ($current)
            return;

        $statement=array(
            "actor"=>array(
                "mbox"=>"mailto:".$swagUser->getEmail(),
                "name"=>$swagUser->getDisplayName(),
            ),

            "object"=>array(
                "objectType"=>"Activity",
                "id"=>$this->getXapiObjectId(),
                "definition"=>array(
                    "name"=>array(
                        "en-US"=>$this->post->post_title
                    )
                )
            ),

            "verb"=>array(
                "id"=>"http://adlnet.gov/expapi/verbs/completed"
            ),

            "context"=>array(
                "contextActivities"=>array(
                    "category"=>array(
                        array(
                            "objectType"=>"Activity",
                            "id"=>"http://swag.tunapanda.org/"
                        )
                    )
                )
            ),
        );

        $xapi->putStatement($statement);
        $swagUser->clearFetchedStatements();
    }

    /**
     * Are all the swag post items completed?
     */
    public function isAllSwagPostItemsCompleted($swagUser) {
        foreach ($this->getSwagPostItems() as $swagPostItem) {
            if (!$swagPostItem->isCompleted($swagUser))
                return FALSE;
        }

        return TRUE;
    }

    /**
     * Save provided swag if the user has completed all
     * swagifacts for the swagpath.
     */
    public function saveProvidedSwagIfCompleted($swagUser) {
        if ($this->isAllSwagPostItemsCompleted($swagUser))
            $this->saveProvidedSwag($swagUser);
    }
}