<?php
/**
 * Item entity file.
 *
 * Creates the entity and makes it available.
 *
 * @author Iñigo Valentin <i@inigovalentin.com>
 * @license https://www.gnu.org/licenses/gpl-3.0.en.html GNU General Public License V3
 * @package SWDB
 */

require_once(PATH::ENTITY . "Entity.php");
require_once(PATH::ENTITY . "Monster.php");

/**
 * An item in the players inventory inventory item.
 *
 * Represents an object owned by the player in any amount.
 *
 * @category Entity
 */
class Item extends Entity{

    /**
     * @var string Owner's player identifier.
     */
    private $player;

    /**
     * @var int|Monster Item identifier. If its a monster piece, a Monster entity.
     */
    private $id;

    /**
     * @var string Item name.
     */
    private $name;

    /**
     * @var string Item type name.
     */
    private $type;

    /**
     * @var int Item owned amount.
     */
    private $amount;

    /**
     * @var bool Indicates if the item are monster pieces.
     */
    private $is_monster_pieces;

    /**
     * Constructor.
     *
     * Searches the database and retrieves the information about the
     * building, populating it and it's items.
     *
     * @param string $player Owner's player identifier.
     * @param int $id Item identifier.
     * @param int $type Item type identifier. Optional, will try to guess if null.
     */
    public function __construct($player, $id, $type = null){

        $s = "
          SELECT
            item.player AS player,
            item.id AS id,
            inventory.name AS name,
            inventory.description AS description,
            item.type AS type_ref,
            inventory_type.name AS type,
            item.amount AS amount
          FROM
            item,
            inventory,
            inventory_type
          WHERE
            item.player = :player AND
            item.id = inventory.id AND
            item.type = inventory.type AND
            inventory.type = inventory_type.id AND
            inventory.id = inventory.id AND
            inventory.type = inventory.type AND
            inventory.id = :id
        ";
        if ($type != null){
            $s .= "AND inventory.type = :type";
        }
        $statement = get_context()->get_db()->prepare($s);
        $statement->bindValue(':player', $player, SQLITE3_TEXT);
        $statement->bindValue(':id', $id, SQLITE3_TEXT);
        $statement->bindValue(':type', $type, SQLITE3_TEXT);
        $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
        if ($r){
            $this->player = $r["player"];
            $this->type = $r["type"];
            $this->amount = $r["amount"];
            if ($r["type"] == INVENTORY_TYPE_ID::GUILD_MONSTER_PIECE || $r["type"] == INVENTORY_TYPE_ID::MONSTER_PIECE){
                $this->is_monster_pieces = true;
                $this->id = new Monster($r["id"]);
                $this->name = HTML::e($this->id->get_title()) . " Pieces";
                $this->description = HTML::e($this->id->get_title()) . " Pieces";
            }
            else{
                $this->is_monster_pices = false;
                $this->id = $r["id"];
                $this->name = HTML::e($r["name"]);
                $this->description = HTML::e($r["description"]);
            }
        }
    }

    /**
     * Retrieves the owner's player identifier
     *
     * @return string Owner's ID.
     */
    public function get_player(){
        return $this->player;
    }

    /**
     * Retrieves the item identifier.
     * If the item is a monster piece, the unit instance will be returned instead
     *
         * @return int|Monster Item ID or monster instance
     */
    public function get_id(){
        return $this->id;
    }

    /**
     * Retrieves the item name.
     *
     * @return string Item name.
     */
    public function get_name(){
        return $this->name;
    }

    /**
     * Retrieves the item type.
     *
     * @return int Item type.
     */
    public function get_type(){
        return $this->type;
    }

    /**
     * Retrieves the owned amount of the item.
     *
     * @return int Owned amount.
     */
    public function get_amount(){
        return $this->amount;
    }

    /**
     * Checks if the item is a monste piece.
     *
     * @return bool True for monster pieces, false otherwise.
     */
    public function is_monster_pieces(){
        return $this->is_monster_pieces;
    }

    /**
     * Gets the path to the item image. 
     *
     * @return string Image URL, or a fixed unknown image.
     */
    public function get_image(){
        return APPLICATION::img("INVENTORY", $this->id);
    }
}