<?php

class MoveBuilder {
    private $moves = array();
    private $moveReferences = array();
    private $pointer = 0;
    private $currentIndex = 0;

    public function __construct(){
        $this->moveReferences[0] =& $this->moves;
    }

    public function addMoves($moveString){
        $moves = explode(" ", $moveString);
        foreach($moves as $move){
            $this->addMove($move);
        }
    }

    private function addMove($move){
        if(!$this->isChessMove($move)){
            return;
        }
        $move = preg_replace("/^([a-h])([18])([QRNB])$/", "$1$2=$3", $move );
        $this->moveReferences[$this->pointer][] = array(CHESS_JSON::MOVE_NOTATION => $move);
        $this->currentIndex ++;
    }

    private function isChessMove($move){
        if($move == '--')return true;
        return preg_match("/([PNBRQK]?[a-h]?[1-8]?x?[a-h][1-8](?:\=[PNBRQK])?|O(-?O){1,2})[\+#]?(\s*[\!\?]+)?/s", $move);
    }

    public function addCommentBeforeFirstMove($comment){
        $comment = trim($comment);
        if(!strlen($comment)){
            return;
        }
        $this->moveReferences[$this->pointer][] = array();
        $this->addComment($comment);
    }

    public function addComment($comment){
        $comment = trim($comment);
        if(!strlen($comment)){
            return;
        }
        $index = count($this->moveReferences[$this->pointer])-1;

        if(strstr($comment,'[%clk' )){
            $clk = preg_replace('/\[%clk[^0-9]*?([0-9\:]+?)[\]]/si', '$1', $comment);
            $comment = str_replace('[%clk ' . $clk . ']', '', $comment);
            $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_CLOCK] = $clk;
        }

        $actions = $this->getActions($comment);
        if(!empty($actions)){
        	if(empty($this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_ACTIONS])){
		        $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_ACTIONS] = array();
	        }
	        foreach($actions as $action){
		        $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_ACTIONS][] = $action;
	        }
        }

        $comment = preg_replace('/\[%'.CHESS_JSON::PGN_KEY_ACTION_ARROW . '[^\]]+?\]/si', '', $comment );
        $comment = preg_replace('/\[%'.CHESS_JSON::PGN_KEY_ACTION_HIGHLIGHT . '[^\]]+?\]/si', '', $comment );
	    $comment = trim($comment);

        if(empty($comment))return;


        $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_COMMENT] = $comment;
    }

    private function getActions($comment){
    	$ret = array();
	    if(strstr($comment,'[%' . CHESS_JSON::PGN_KEY_ACTION_ARROW )){
		    $arrow = preg_replace('/.*?\[%'. CHESS_JSON::PGN_KEY_ACTION_ARROW . ' ([^\]]+?)\].*/si', '$1', $comment);
		    $arrows = explode(",", $arrow);

		    foreach($arrows as $arrow){
		    	$tokens = explode(";", $arrow);
		    	if(strlen($tokens[0]) == 4){
				    $action = array(
					    "from" => substr($arrow,0,2),
					    "to" => substr($arrow, 2,2)
				    );
				    if(count($tokens) > 1){
					    $action["color"] = $tokens[1];
				    }
				    $ret[] = $this->toAction("arrow", $action);
			    }
		    }
	    }
	    if(strstr($comment,'[%' . CHESS_JSON::PGN_KEY_ACTION_HIGHLIGHT )){
		    $arrow = preg_replace('/.*?\[%'. CHESS_JSON::PGN_KEY_ACTION_HIGHLIGHT . ' ([^\]]+?)\].*/si', '$1', $comment);
		    $arrows = explode(",", $arrow);

		    foreach($arrows as $arrow){
		    	$tokens = explode(";", $arrow);
		    	if(strlen($tokens[0]) == 2){
				    $action = array(
					    "square" => substr($arrow,0,2)
				    );
				    if(count($tokens) > 1){
					    $action["color"] = $tokens[1];
				    }
				    $ret[] = $this->toAction("highlight", $action);
			    }
		    }
	    }
	    return $ret;
    }

	/**
	 * @param string $key
	 * @param array $val
	 *
	 * @return array
	 */
    private function toAction($key, $val){
    	$val["type"] = $key;
    	return $val;
    }

    public function startVariation(){
        $index = count($this->moveReferences[$this->pointer])-1;
        if(!isset($this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_VARIATIONS])){
            $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_VARIATIONS] = array();
        }
        $countVariations = count($this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_VARIATIONS]);
        $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_VARIATIONS][$countVariations] = array();
        $this->moveReferences[] =& $this->moveReferences[$this->pointer][$index][CHESS_JSON::MOVE_VARIATIONS][$countVariations];
        $this->pointer++;
    }

    public function endVariation(){
        array_pop($this->moveReferences);
        $this->pointer--;
    }

    public function getMoves(){
        return $this->moves;
    }
}