%%%% This package will be developed for proofs with automatic references to theorems
% for claims numbered within these profos
% and for nice subproof  / proof of claim environments

%%Give claim an own counter and let it reset at each proof
%See also at:
%https://tex.stackexchange.com/questions/283502/reset-counter-at-beginning-of-proof
\newtheorem{claim}{\ifenglish Claim\else Behauptung\fi}
\newtheorem*{claim*}{\ifenglish Claim\else Behauptung\fi}
\AtBeginEnvironment{proof}{\setcounter{claim}{0}}

\let\mkessler@fancythm@saved@proof\proof
\let\mkessler@fancythm@saved@endproof\endproof

\newif\ifhyperref
\AtBeginDocument{
        \@ifpackageloaded{hyperref}{\hyperreftrue}{\hyperreffalse}
}

\newcounter

\NewDocumentEnvironment{rproof}{m}
{
    \begin{proof}[Beweis von \ifhyperref\autoref{#1}\else\ref{#1}\fi]
}
{
    \end{proof}
}

%Proof (with asterisk)
\newenvironment{proof*}[1][\ifenglish Proof\else Beweis\fi]{\begin{proof}[#1\emph{*}]}{\end{proof}}

%%subproof environment - essentially copied proof environment from amsthm and modified its name + symbol
\DeclareRobustCommand{\blackqed}{%
  \ifmmode \mathqed
  \else
    \leavevmode\unskip\penalty9999 \hbox{}\nobreak\hfill
    \quad\hbox{$\blacksquare$}%
  \fi
}

\newenvironment{subproof}[1][\ifenglish Subproof\else Unterbeweis\fi]{\par
  \pushQED{\blackqed}%
  \normalfont \topsep6\p@\@plus6\p@\relax
  \trivlist
  \item[\hskip\labelsep
        \itshape
    #1\@addpunct{.}]\ignorespaces
}{%
  \popQED\endtrivlist\@endpefalse
}


%%%% This might be dropped, but for now is collected here

%%Solution (for exercises)
\newenvironment{solution}[1][]{\begin{proof}[\ifenglish{}Solution\else{}Lösung\fi{}#1]}{\end{proof}}
\newenvironment{additionproof}[1][]{\begin{proof}[\ifenglish{}Additional proof\else{}zuBeweis\fi{}#1]}{\end{proof}}