 <?php
    /**
     * Unit 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");
    require_once(PATH::ENTITY . "Effect.php");

    /**
     * Unit list page model.
     *
     * @category Page
     */
    class Units_Page extends Page{

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

        /**
         * @var mixed[] Default filter values.
         */
        public $filters = [
            "ELEMENT" => -1,
            "NAME" => "",
            "MIN_STARS" => 1,
            "MAX_STARS" => 6,
            "IN_STORAGE" => false,
            "WITHOUT_RUNES" => false,
            "EFFECT" => [],
            "EFFECT_OPTION" => "any"
        ];

        /**
         * @var Effect[] All availabe skill effects, for the tfilter selector.
         */
        public $effects = [];

        /**
         * Constructor.
         *
         * Retrieves the data and initializes the variables.
         */
        public function __construct(){
            $this->view = PATH::VIEW . "units.php";
            $this->parse_filters();
            $s = $this->build_query();
            $q = get_context()->get_db()->query($s);
            while ($r = $q->fetchArray(SQLITE3_ASSOC)){
                array_push($this->units, new Unit($r["id"]));
            }
            // Get skill effects
            $s_eff = "SELECT id FROM effect ORDER BY is_buff DESC";
            $q_eff = get_context()->get_db()->query($s_eff);
            while ($r_eff = $q_eff->fetchArray(SQLITE3_ASSOC)){
                array_push($this->effects, new Effect($r_eff["id"]));
            }
            $this->title = "Units - SWDB";
            $this->description = "Owned units";
            $this->canonical = URL::BASE . "units/";
        }

        /**
         * Parses the request looking for the selected filters, validates them
         * and adds them to the $filters array.
         */
        private function parse_filters(){
            if (isset($_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"){
                $this->filters["WITHOUT_RUNES"] = true;
            }
            if (isset($_GET["effect"])){
                $effects = $_GET["effect"];
                foreach ($effects as $effect){
                    if (intval($effect) > 0){
                        array_push($this->filters["EFFECT"], intval($effect));
                    }
                }
            }
            if (isset($_GET["effect_option"]) && ($_GET["effect_option"] == "and" || $_GET["effect_option"] == "or")){
                $this->filters["EFFECT_OPTION"] = $_GET["effect_option"];
            }
            return;
        }

        /**
         * Builds the query to the rune table using the selected or default
         * filters.
         *
         * @return string The query to be executed.
         */
        private function build_query(){
            $s = "
                SELECT unit.id AS id
                FROM
                  unit,
                  monster
                WHERE
                  unit.player = '" . get_context()->get_player()->get_id() . "' AND
                  unit.monster = monster.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 monster IN (SELECT id FROM monster WHERE element = " . $this->filters["ELEMENT"] . ") ";
            }
            if ($this->filters["NAME"] != ""){
                $s = $s . " AND monster IN (SELECT id FROM monster WHERE upper(name) LIKE '%" . strtoupper($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 = $s . " AND unit.id IN (SELECT DISTINCT unit FROM unit_rune) ";
            }
            if (sizeof($this->filters["EFFECT"]) > 0){
                if ($this->filters["EFFECT_OPTION"] == "and"){
                    foreach ($this->filters["EFFECT"] as $effect){
                        $s .= "
                        AND monster.id IN (
                          SELECT DISTINCT unit
                          FROM
                            monster_skill,
                            skill_effect
                          WHERE
                            monster_skill.skill = skill_effect.skill AND
                            skill_effect.effect = $effect
                        )
                        ";
                    }
                }
                elseif ($this->filters["EFFECT_OPTION"] == "or"){
                    $s .= " AND ( ";
                    foreach ($this->filters["EFFECT"] as $effect){
                        $s .= "
                        monster.id IN (
                          SELECT DISTINCT unit
                          FROM
                            monster_skill,
                            skill_effect
                          WHERE
                            monster_skill.skill = skill_effect.skill AND
                            skill_effect.effect = $effect
                        ) OR
                        ";
                    }
                    $s .= " 1 = 2 ) ";
                }
            }
            $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;
        }

    }
?>