 <?php
/**
 * Unit list page file.
 *
 * Provides a class with all the properties and methods to display the page.
 *
 * @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::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.
     */
    private $units = [];

    /**
     * @var mixed[] Default filter values.
     */
    private $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 filter selector.
     */
    private $effects = [];

    /**
     * Constructor.
     *
     * Retrieves the data and initializes the variables.
     */
    public function __construct(){
        parent::__construct();
        $this->set_public(true);
        $this->set_view("units.php");
        $this->set_title("Units");
        $this->set_description(get_context()->get_player()->get_name() . "'s units");
        $this->set_canonical("player/" . get_context()->get_player()->get_id() . "/units/");
        $this->add_css("units.css");

        $this->parse_filters();
        $result_set = $this->prepare_statement()->execute();
        while ($result = $result_set->fetchArray(SQLITE3_ASSOC)){
            array_push($this->units, new Unit($result["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->set_code(200);
        $this->set_message("OK");
    }

    /**
     * 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;
    }

    /**
     * Prepares the statement to execute against the database using the filter values.
     *
     * @return SQLite3Stmt prepared statement.
     */
    private function prepare_statement(){
        
        // Common items
        $query = "
            SELECT unit.id AS id
            FROM
              unit,
              monster
            WHERE
              unit.player = :player AND
              unit.monster = monster.id AND 
              unit.stars BETWEEN :min_stars AND :max_stars
        ";
        if (APPLICATION::valid_id("ELEMENT_ID", $this->filters["ELEMENT"])){
            $query .= " AND monster.element = :element ";
        }
        if ($this->filters["NAME"] != ""){
            $query .= " AND upper(monster.name) LIKE upper(:name) ";
        }
        if (! $this->filters["IN_STORAGE"]){
            $query .= " AND unit.building <> :storage_building ";
        }
        if (!$this->filters["WITHOUT_RUNES"]){
            $query .= " AND unit.id IN (SELECT DISTINCT unit FROM unit_rune WHERE rta = :rta) ";
        }
        if (sizeof($this->filters["EFFECT"]) > 0){
            if ($this->filters["EFFECT_OPTION"] == "and"){
                for ($i = 0; $i < sizeof($this->filters["EFFECT"]); $i ++){
                    $query .= "
                    AND monster.id IN (
                      SELECT DISTINCT monster
                      FROM
                        monster_skill,
                        skill_effect
                      WHERE
                        monster_skill.skill = skill_effect.skill AND
                        skill_effect.effect = :effect_$i
                      )
                    ";
                }
            }
            elseif ($this->filters["EFFECT_OPTION"] == "or"){
                $query .= " AND ( ";
                for ($i = 0; $i < sizeof($this->filters["EFFECT"]); $i ++){
                    $query .= "
                    monster.id IN (
                      SELECT DISTINCT monster
                      FROM
                        monster_skill,
                        skill_effect
                      WHERE
                        monster_skill.skill = skill_effect.skill AND
                        skill_effect.effect = :effect_$i
                    ) OR ";
                }
                $query = rtrim($query, " OR ") . ") ";
            }
        }
        $query .= "
            ORDER BY
              stars DESC,
              level DESC,
              element = :fire DESC,
              element = :water DESC,
              element = :wind DESC,
              element = :light DESC,
              element = :dark DESC
        ";
        $statement = get_context()->get_db()->prepare($query);
        $statement->bindValue(":player", get_context()->get_player()->get_id(), SQLITE3_TEXT);
        $statement->bindValue(":min_stars", $this->filters["MIN_STARS"], SQLITE3_INTEGER);
        $statement->bindValue(":max_stars", $this->filters["MAX_STARS"], SQLITE3_INTEGER);
        $statement->bindValue(":element", $this->filters["ELEMENT"], SQLITE3_INTEGER);
        $statement->bindValue(":name", "%" . $this->filters["NAME"] . "%", SQLITE3_TEXT);
        $statement->bindValue(":storage_building", BUILDING_ID::MONSTER_STORAGE, SQLITE3_INTEGER);
        $statement->bindValue(":rta", get_context()->get_game_mode(), SQLITE3_INTEGER);
        for ($i = 0; $i < sizeof($this->filters["EFFECT"]); $i ++){
            $statement->bindValue(":effect_$i", $this->filters["EFFECT"][$i], SQLITE3_INTEGER);
        }
        $statement->bindValue(":fire", ELEMENT_ID::FIRE, SQLITE3_INTEGER);
        $statement->bindValue(":water", ELEMENT_ID::WATER, SQLITE3_INTEGER);
        $statement->bindValue(":wind", ELEMENT_ID::WIND, SQLITE3_INTEGER);
        $statement->bindValue(":light", ELEMENT_ID::LIGHT, SQLITE3_INTEGER);
        $statement->bindValue(":dark", ELEMENT_ID::DARK, SQLITE3_INTEGER);
        return $statement;
    }
    
    /**
     * Retrieves the page filters.
     *
     * @return mixed[] Page filtes
     */
    public function get_filters(){
        return $this->filters;
    }
    
    /**
     * Retrieves one filter.
     *
     * @param string $key
     * @return mixed Filter value, null if if doesn't exist.
     */
    public function get_filter($key){
        if (array_key_exists($key, $this->filters)){
            return $this->filters[$key];
        }
        else{
            return null;
        }
    }
    
    /**
     * Retrieves the selection of units.
     *
     * @return Unit[] Unit to show on the page.
     */
    public function get_units(){
        return $this->units;
    }
    
    /**
     * Retrieves all existing skill effects.
     *
     * @return Effect[] Every skill effects.
     */
    public function get_effects(){
        return $this->effects;
    }

}