 <?php
    /**
     * Monster list page file.
     *
     * Provides a class with all the properties and methods to display the page.
     *
     * @category Page
     */

    /**
     * Require dependent files if not present.
     */
    require_once(PATH::PAGE . "Page.php");
    require_once(PATH::ENTITY . "Unit.php");

    /**
     * Monster list page model.
     *
     * @category Page
     */
    class Monsters_Page extends Page{

        /**
         * @var \Unit[] Units to show.
         */
        public $monsters = [];

        /**
         * Constructor.
         *
         * Retrieves the data and initializes the variables.
         *
         * @global resource Database connection.
         */
        public function __construct(){
            global $db;
            $this->view = PATH::VIEW . "monsters.php";
            $this->parse_filters();
            $s_mon = $this->build_query();
            $q_mon = $db->query($s_mon);
            while ($r_mon = $q_mon->fetchArray(SQLITE3_ASSOC)){
                array_push($this->monsters, new Unit($r_mon["id"]));
            }
            $this->title = "Monsters - SWDB";
            $this->description = "Owned monsters";
            $this->canonical = URL::BASE . "monsters/";
        }

        /**
         * Parses the request looking for the selected filters, validates them
         * and adds them to the $filters array.
         */
        private function parse_filters(){
            $this->filters = FILTER::MONSTER;
            if (isset($_GET["element"]) && APPLICATION::valid_id("ELEMENT_ID", strtoupper($_GET["element"]))){
                $this->filters["ELEMENT"] = $_GET["element"];
            }
            if (isset($_GET["name"]) && strlen($_GET["name"]) > 0){
                $this->filters["NAME"] = SQLite3::escapeString($_GET["name"]);
            }
            if (isset($_GET["min_stars"]) && intval($_GET["min_stars"]) > 0 && intval($_GET["min_stars"]) <= 6){
                $this->filters["MIN_STARS"] = $_GET["min_stars"];
            }
            if (isset($_GET["max_stars"]) && intval($_GET["max_stars"]) > 0 && intval($_GET["max_stars"]) <= 6){
                $this->filters["MAX_STARS"] = $_GET["max_stars"];
            }
            if (isset($_GET["in_storage"]) && $_GET["in_storage"] == "on"){
                $this->filters["IN_STORAGE"] = true;
            }
            else{
                $this->filters["IN_STORAGE"] = false;
            }
            if (isset($_GET["without_runes"]) && $_GET["without_runes"] == "on"){
                $this->filters["WITHOUT_RUNES"] = true;
            }
            return;
        }

        /**
         * Builds the query to the rune table using the selected or default
         * filters.
         *
         * @return string The query to be executed.
         * @global int Player ID.
         * @global resource Database connection.
         */
        private function build_query(){
            global $UID;
            global $db;
            $s = "
                SELECT unit.id AS id
                FROM
                  unit,
                  k_unit
                WHERE
                  unit.uid = '$UID' AND
                  unit.unit = k_unit.id AND 
                  stars >= " . $this->filters["MIN_STARS"] . " AND 
                  stars <= " . $this->filters["MAX_STARS"];
            if (APPLICATION::valid_id("ELEMENT_ID", $this->filters["ELEMENT"])){
                $s = $s . " AND unit IN (SELECT id FROM k_unit WHERE element = " . $this->filters["ELEMENT"] . ") ";
            }
            if ($this->filters["NAME"] != ""){
                $s = $s . " AND unit IN (SELECT id FROM k_unit WHERE upper(name) LIKE '%" . strtoupper($this->filters["NAME"]) . "%') ";
            }
            if (!$this->filters["IN_STORAGE"]){
                $s = $s . " AND building NOT IN (SELECT id FROM building WHERE building = " . BUILDING_ID::MONSTER_STORAGE . ") ";
            }
            if (!$this->filters["WITHOUT_RUNES"]){
                $s = $s . " AND unit.id IN (SELECT DISTINCT assigned_to FROM rune) ";
            }
            $s = $s . "
                ORDER BY 
                  stars DESC,
                  level DESC,
                  element = " . ELEMENT_ID::FIRE ." DESC,
                  element = " . ELEMENT_ID::WATER ." DESC,
                  element = " . ELEMENT_ID::WIND ." DESC,
                  element = " . ELEMENT_ID::LIGHT ." DESC,
                  element = " . ELEMENT_ID::DARK ." DESC
            ";
            return $s;
        }

    }
?>