<?php
/**
 * Team 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 dependent entities if not present.
 */
require_once(PATH::ENTITY . "Area.php");
require_once(PATH::ENTITY . "Unit.php");

/**
 * A Team.
 *
 * Represents an object from the table 'unit'.
 *
 * @category Entity
 */
class Team extends Entity{

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

    /**
     * @var int Team identifier.
     */
    private $id;

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

    /**
     * @var string Team description.
     */
    private $description;

    /**
     * @var bool Internal flag to check if the team units have been loaded into the entity.
     */
    private $flag_units = false;
    /**
     * @var Unit[] Units in the team.
     */
    private $unit = [];

    /**
     * @var int ID of the leader unit.
     */
    private $leader;

    /**
     * @var int[] List of IDs of the frontline units.
     */
    private $frontline = [];

    /**
     * @var Area Area the team is designed for.
     */
    private $area;

    /**
     * @var int Stage the team is designed for. It can be null.
     */
    private $stage;

    /**
     * @var int difficulty the team is designed for. It can be null.
     * @see DIFFICULTY_ID
     */
    private $difficulty;

    /**
     * @var int Team score for the optmizer
     */
    private $score;

    /**
     * Constructor.
     *
     * Searches the database and retrieves the information about the
     * team, populating it and it's items.
     *
     * @param int $id Team identifier.
     */
    public function __construct($id){

        $statement = get_context()->get_db()->prepare("
          SELECT
            player,
            id,
            name,
            description,
            area_type,
            area,
            stage,
            difficulty,
            score
          FROM team
          WHERE id = :id;
        ");
        $statement->bindValue(':id', $id, SQLITE3_TEXT);
        $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
        if ($r){
            $this->player = $r["player"];
            $this->id = $r["id"];
            $this->name = HTML::e($r["name"]);
            $this->description = HTML::e($r["description"]);
            $this->area = new Area($r["area"], $r["area_type"]);
            $this->stage = $r["stage"];
            $this->score = $r["score"];
        }
    }

    /**
     * Loads the team units into the entity.
     *
     * Must be called only once before trying to get the party units, leader or positions. Sets
     * the flag {@link Team:$flag_units} to true.
     */
    private function load_units(){
        $statement = get_context()->get_db()->prepare("
          SELECT
            unit,
            leader,
            front
          FROM team_unit
          WHERE team = :team
          ORDER BY
            front DESC,
            leader DESC;
        ");
        $statement->bindValue(':team', $this->id, SQLITE3_TEXT);
        $q = $statement->execute();
        while ($r = $q->fetchArray(SQLITE3_ASSOC)){
            array_push($this->unit, new Unit($r["unit"], false));
            if ($r["leader"] == 1){
                $this->leader = $r["unit"];
            }
            if ($r["front"] == 1){
                array_push($this->frontline, $r["unit"]);
            }
        }
        $this->flag_units = true;
    }

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

    /**
     * Retrieves the team identifier.
     *
     * @return int Team ID.
     */
    public function get_id(){
        return $this->id;
    }

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

    /**
     * Retrieves the team description.
     *
     * @return string Team description (can be an empty string).
     */
    public function get_description(){
        return $this->description;
    }

    /**
     * Retrieves the units in the team.
     *
     * @return Unit[] Units in the team.
     */
    public function get_units(){
        if (! $this->flag_units){
            $this->load_units();
        }
        return $this->unit;
    }

    /**
     * Retrieves the leader unit's identifier.
     *
     * @return int Leader unit ID.
     */
    public function get_leader(){
        return $this->leader;
    }

    /**
     * Retrieves the identifiers of the units in the frontline.
     *
     * @return int[] ID of units in the frontline.
     */
    public function get_frontline(){
        return $this->frontline;
    }

    /**
     * Retrieves the area the team is set for.
     *
     * @return Area Team area.
     */
    public function get_area(){
        return $this->area;
    }

    /**
     * Retrieves the stage the team is intended to.
     *
     * @return int Team stage, can be null.
     */
    public function get_stage(){
        return $this->stage;
    }

    /**
     * Retrieves the difficulty of the area the team is intended for.
     * 
     * @see DIFFICULTY_ID
     * @return int Difficulty ID, can be null.
     */
    public function get_difficulty(){
        return $this->difficulty;
    }

    /**
     * Retrieves the score of the team for the optimizer.
     *
     * @return int Team score.
     */
    public function get_score(){
        return $this->score;
    }

}