<?php
    /**
     * Transformation entity file.
     *
     * Creates the entity and makes it available.
     *
     * @category Entity
     */

    /**
     * Require dependent entities if not present.
     */
    require_once(PATH::ENTITY . "Entity.php");
    require_once(PATH::ENTITY . "Skill.php");
    require_once(PATH::ENTITY . "Leader_Skill.php");
    require_once(PATH::ENTITY . "Source.php");


    /**
     * Monster transformation.
     *
     * Represents an object from the table 'monster_transformation'.
     *
     * @category Entity
     */
    class Monster_Transformation extends Entity{

        /**
         * @var int Transformed monster identifier.
         */
        public $id;

        /**
         * @var int Transformed monster family id.
         */
        public $family;

        /**
         * @var int ID of the monster that transformes into this.
         */
        public $monster;

        /**
         * @var \Skill[] Skills in the transformed form.
         */
        public $skill = [];

        /**
         * Constructor.
         *
         * Searches the database and retrieves the information about the
         * trnsformed monster, populating it and it's items.
         *
         * @param int $id Transformed monster identifier.
         */
        public function __construct($id){
            $statement = get_context()->get_db()->prepare("
              SELECT
                id,
                family,
                monster
              FROM monster_transformation
               WHERE id = :id;
            ");
            $statement->bindValue(':id', $id, SQLITE3_TEXT);
            $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
            if ($r){
                $this->id = $r["id"];
                $this->family = $r["family"];
                $this->monster = $r["monster"];
                $this->load_skills();
            }
        }

        /**
         * Loads the information about the monster skills in the transformed form.
         */
        private function load_skills(){
            $this->skill = [];
            $statement = get_context()->get_db()->prepare("
              SELECT skill
              FROM
                skill,
                monster_skill
              WHERE
                id = skill AND
                monster = :id
              ORDER BY slot;
            ");
            $statement->bindValue(':id', $this->id, SQLITE3_TEXT);
            $q = $statement->execute();
            while ($r = $q->fetchArray(SQLITE3_ASSOC)){
                array_push($this->skill, new Skill($r["skill"]));
            }
        }

        /**
         * Gets the path to the monster image. The image must be in the
         * img/monster/ directory, and it's name must be the monster id,
         * padded with '0' to 8 digits, and the extension must be '.png'.
         *
         * @return string Image URL, or a fixed unknown image.
         */
        public function get_image(){
            return APPLICATION::img("UNIT", $this->id);
        }

    }
?>