\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{fancythm}[2021/03/31 - Theorem-Environment Package by Maximilian Kessler (private use)]
\newif\ifenglish\englishtrue
\DeclareOption{english}{\englishtrue}
\DeclareOption{german}{\englishfalse}
\DeclareOption*{\PackageWarning{fancythm}{Unknown '\CurrentOption'}}

\ProcessOptions\relax

%Theorem-environments
\RequirePackage{amsthm}
\RequirePackage{mdframed}
\RequirePackage[skins]{tcolorbox}
\mdfsetup{skipabove=\topskip,skipbelow=\topskip}

%%%Define styles
\newtheoremstyle{own}%〈name〉
{3pt}%〈Space above〉1
{3pt}%〈Space below〉1
{}%〈Body font〉
{}%〈Indent amount〉2
{\bfseries}%〈Theorem head font〉
{.}%〈Punctuation after theorem head〉
{.5em}%〈Space after theorem head〉3
{}%〈Theorem head spec(can be left empty, meaning ‘normal’)〉

\theoremstyle{own}

%%%Define styles for mdframed
\global\mdfdefinestyle{thm}{linecolor=red,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, backgroundcolor=red!8, rightline=false, topline=false, bottomline=false}

\global\mdfdefinestyle{lemma}{linecolor=orange,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, backgroundcolor=orange!10, rightline=false, topline=false, bottomline=false}

\global\mdfdefinestyle{definition}{linecolor=blue,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, backgroundcolor=blue!7, rightline=false, topline=false, bottomline=false}

\global\mdfdefinestyle{example}{linecolor=green!70!black,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, rightline=false, topline=false, bottomline=false}

\global\mdfdefinestyle{remark}{linecolor=yellow!80!orange,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, rightline=false, topline=false, bottomline=false}


\global\mdfdefinestyle{notation}{linecolor=violet,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, backgroundcolor=violet!7, rightline=false, topline=false, bottomline=false}

\global\mdfdefinestyle{theoremdef}{linecolor=red,linewidth=2pt,leftmargin=0cm,rightmargin=0cm, backgroundcolor=blue!7, rightline=false, topline=false, bottomline=false}


%Theorem
\newtheorem{protothm}{\ifenglish Theorem\else Satz \fi}[section]
\newenvironment{theorem}{\begin{mdframed}[style=thm] \begin{protothm}}{\end{protothm}\end{mdframed}}

%Unnumbered Theorem
\newtheorem*{protothm*}{\ifenglish Theorem\else Satz\fi}
\newenvironment{theorem*}{\begin{mdframed}[style=thm] \begin{protothm*}}{\end{protothm*}\end{mdframed}}

%Proposition
\newtheorem{protoprop}[protothm]{Proposition}
\newenvironment{proposition}{\begin{mdframed}[style=thm] \begin{protoprop}}{\end{protoprop}\end{mdframed}}

%Unnumbered Proposition
\newtheorem{protoprop*}[protothm]{Proposition}
\newenvironment{proposition*}{\begin{mdframed}[style=thm] \begin{protoprop*}}{\end{protoprop*}\end{mdframed}}

%Corollary
\newtheorem{protocor}[protothm]{\ifenglish Corollary\else Korollar\fi}
\newenvironment{corollary}{\begin{mdframed}[style=thm] \begin{protocor}}{\end{protocor}\end{mdframed}}

%Unnumbered Corollary
\newtheorem{protocor*}[protothm]{\ifenglish Corollary\else Korollar\fi}
\newenvironment{corollary*}{\begin{mdframed}[style=thm] \begin{protocor*}}{\end{protocor*}\end{mdframed}}

%Lemma
\newtheorem{protolemma}[protothm]{Lemma}
\newenvironment{lemma}{\begin{mdframed}[style=lemma] \begin{protolemma}}{\end{protolemma}\end{mdframed}}

%Unnumbered Lemma
\newtheorem*{protlemma*}{Lemma}
\newenvironment{lemma*}{\begin{mdframed}[style=lemma] \begin{protolemma*}}{\end{protolemma*}\end{mdframed}}

%Definition
\newtheorem{protodefinition}[protothm]{Definition}
\newenvironment{definition}{\begin{mdframed}[style=definition] \begin{protodefinition}}{\end{protodefinition}\end{mdframed}}

%unnumbered Definition
\newtheorem*{protodefinition*}{Definition}
\newenvironment{definition*}{\begin{mdframed}[style=definition] \begin{protodefinition*}}{\end{protodefinition*}\end{mdframed}}

%Theorem + Definition
\newtheorem{prototheoremdef}[protothm]{\ifenglish Theorem and Definition\else Satz und Definition\fi}
\newenvironment{theoremdef}{\begin{mdframed}[style=theoremdef] \begin{prototheoremdef}}{\end{prototheoremdef}\end{mdframed}}

%Notation
\newtheorem*{protonotation}{Notation}
\newenvironment{notation}{\begin{mdframed}[style=notation] \begin{protonotation}}{\end{protonotation}\end{mdframed}}

%Example
\newtheorem*{protoexample}{\ifenglish Example\else Beispiel\fi}
\newenvironment{example}{\begin{mdframed}[style=example] \begin{protoexample}}{\end{protoexample}\end{mdframed}}

%Remark
\newtheorem*{protoremark}{\ifenglish Remark\else Bemerkung\fi}
\newenvironment{remark}{\begin{mdframed}[style=remark] \begin{protoremark}}{\end{protoremark}\end{mdframed}}



\newtcolorbox{recap}{before skip = 0.5cm, after skip = 0.5cm, enhanced, sharp corners = all, colback = white, colframe = gray, toprule=0pt, bottomrule=0pt, leftrule=0pt,rightrule=0pt, overlay = {
        \draw[gray, line width = 2pt] (frame.north west) -- ++(0.5cm, 0pt);
        \draw[gray, line width=2pt] (frame.south east) -- ++(-0.5cm, 0pt);
        \draw[gray, line width=2pt] (frame.north west) -- ++ (0pt, -0.5cm);
        \draw[gray, line width=2pt] (frame.south east) -- ++(0pt, 0.5cm);
}}