class Comment

class Comment extends PartParser {
    
    /**
     * @var int
     */
    private $openedParenthesis = 0;
    
    /**
     * @var CommentStrategy
     */
    private $commentStrategy;
    public function __construct(EmailLexer $lexer, CommentStrategy $commentStrategy) {
        $this->lexer = $lexer;
        $this->commentStrategy = $commentStrategy;
    }
    public function parse() : Result {
        if ($this->lexer->current
            ->isA(EmailLexer::S_OPENPARENTHESIS)) {
            $this->openedParenthesis++;
            if ($this->noClosingParenthesis()) {
                return new InvalidEmail(new UnclosedComment(), $this->lexer->current->value);
            }
        }
        if ($this->lexer->current
            ->isA(EmailLexer::S_CLOSEPARENTHESIS)) {
            return new InvalidEmail(new UnOpenedComment(), $this->lexer->current->value);
        }
        $this->warnings[WarningComment::CODE] = new WarningComment();
        $moreTokens = true;
        while ($this->commentStrategy
            ->exitCondition($this->lexer, $this->openedParenthesis) && $moreTokens) {
            if ($this->lexer
                ->isNextToken(EmailLexer::S_OPENPARENTHESIS)) {
                $this->openedParenthesis++;
            }
            $this->warnEscaping();
            if ($this->lexer
                ->isNextToken(EmailLexer::S_CLOSEPARENTHESIS)) {
                $this->openedParenthesis--;
            }
            $moreTokens = $this->lexer
                ->moveNext();
        }
        if ($this->openedParenthesis >= 1) {
            return new InvalidEmail(new UnclosedComment(), $this->lexer->current->value);
        }
        if ($this->openedParenthesis < 0) {
            return new InvalidEmail(new UnOpenedComment(), $this->lexer->current->value);
        }
        $finalValidations = $this->commentStrategy
            ->endOfLoopValidations($this->lexer);
        $this->warnings = [
            $this->warnings,
            $this->commentStrategy
                ->getWarnings(),
        ];
        return $finalValidations;
    }
    
    /**
     * @return void
     */
    private function warnEscaping() : void {
        
        //Backslash found
        if (!$this->lexer->current
            ->isA(EmailLexer::S_BACKSLASH)) {
            return;
        }
        if (!$this->lexer
            ->isNextTokenAny(array(
            EmailLexer::S_SP,
            EmailLexer::S_HTAB,
            EmailLexer::C_DEL,
        ))) {
            return;
        }
        $this->warnings[QuotedPart::CODE] = new QuotedPart($this->lexer
            ->getPrevious()->type, $this->lexer->current->type);
    }
    private function noClosingParenthesis() : bool {
        try {
            $this->lexer
                ->find(EmailLexer::S_CLOSEPARENTHESIS);
            return false;
        } catch (\RuntimeException $e) {
            return true;
        }
    }

}