%% ----------------------------------------------------------------------------
%% required packages
%% ----------------------------------------------------------------------------

\RequirePackage{calc}
\RequirePackage{graphicx}
\RequirePackage{tikz}

\RequirePackage{hyperref} %% should be included last

%% ----------------------------------------------------------------------------
%% options
%% ----------------------------------------------------------------------------

\newif\iflang@dutch
\lang@dutchfalse
\newif\ifsection@pages
\section@pagestrue
\newif\ifhelvet
\helvetfalse
\DeclareOptionBeamer{dutch}{\lang@dutchtrue}
\DeclareOptionBeamer{english}{\lang@dutchfalse}
\DeclareOptionBeamer{sectionpages}{\section@pagestrue}
\DeclareOptionBeamer{nosectionpages}{\section@pagesfalse}
\DeclareOptionBeamer{helvet}{\helvettrue}
\ProcessOptionsBeamer

%% ----------------------------------------------------------------------------
%% colors
%% ----------------------------------------------------------------------------

% Official CS colors
\definecolor{uuxsilver}{rgb} {0.5,0.5,0.5}
\definecolor{uuxorange}{cmyk}{0,0.25,0.9,0}
\definecolor{uuxgreen} {cmyk}{1,0,0.75,0}
\definecolor{uuxred}   {cmyk}{0.2,1,0.9,0.1}

% Corporate colors
\definecolor{uuyyellow}{cmyk}{0,0.115,0.94,0.15}
\definecolor{uuyred}   {cmyk}{0,0.91,0.76,0.06}

% Extra corporate colors
\definecolor{uuyorange}{cmyk}{0,0.3,0.9,0}
\definecolor{uuyred}   {cmyk}{0.2,1,0.9,0.1}
\definecolor{uuygreen} {cmyk}{0.9,0.15,0.7,0}
\definecolor{uuyblue}  {cmyk}{0.9,0.55,0,0}
\definecolor{uuypurple}{cmyk}{0.7,1,0.2,0.05}

%

%% ----------------------------------------------------------------------------
%% outer theme
%% ----------------------------------------------------------------------------

% dimensions: 128mm * 96mm

\setbeamercolor{background canvas}{fg=black,bg=uuxsilver!20!white}
\setbeamercolor{structure}{fg=uuxred}

\newcommand{\backgroundpicture}{uueduc}
\newcommand{\includebackgroundpicture}{%
  \if!\backgroundpicture!
    \relax
  \else
    \includegraphics[width=12.8cm]{\backgroundpicture}%
  \fi}

\newcommand{\frontmatter}{%
  \setbeamertemplate{background}{%
    \begin{tikzpicture}{0mm}{0mm}%
      \clip (0,0) rectangle (12.8,9.6);%
      \fill [uuxorange] (0,0) rectangle (12.8,9.6);%    
      \fill [uuxsilver] (45,10.5) circle (43.75cm);%
      \fill [uuxred] (12.8,-23) circle (32.3cm);%
      \begin{scope}%
        \clip (12.8,-23) circle (32.3cm);%
        \clip (45,10.5) circle (43.75cm);%
        \fill [uuxsilver!10!white] (45,10.5) circle (43.75cm);%
        \draw [opacity=0.2] (6.9,4.8) node%
          {\includebackgroundpicture};%
      \end{scope}%
      \draw (2.9,7.2) node {\includegraphics[height=1.1cm]{uulogo}};%
      \draw (9.8,7.35) node {\parbox[b]{5cm}{\scriptsize\cs@logo}};%
    \end{tikzpicture}}%
  \setbeamertemplate{navigation symbols}{}}

\newcommand{\mainmatter}{%
  \setbeamertemplate{background}{%
    \begin{tikzpicture}{0mm}{0mm}%
      \clip (0,0) rectangle (12.8,9.6);%
      \fill [uuxsilver!50!white] (0,0) rectangle (12.8,9.6);%
        \draw [opacity=0.2] (-3.0,4.8) node%
          {\includebackgroundpicture};%
      \fill [uuxsilver!10!white] (30,6.5) circle (28.9cm);%
      \draw (2.8,0.6) node {\includegraphics[height=0.8cm]{uulogo}};%
      \draw (10.3,0.7) node {\parbox[b]{4cm}{\tiny\cs@logo}};%
      \draw (0.5,0.25) node {\tiny\insertframenumber};%
    \end{tikzpicture}}%
  \setbeamertemplate{navigation symbols}{%
    \insertslidenavigationsymbol%
    \insertframenavigationsymbol%
    \insertsubsectionnavigationsymbol%
    \insertsectionnavigationsymbol%
    \insertdocnavigationsymbol%
    \insertbackfindforwardnavigationsymbol%
    \hspace{0.35cm}}}

\mainmatter

\setbeamersize{text margin left=2cm}
\setbeamersize{text margin right=.5cm}

\newcommand{\cs@englishlogo}{%
  \raggedleft %
  \sffamily%
  \textcolor{uuxred}{\textbf{[}}%%
  Faculty of \textbf{Science}\\%
  \textcolor{uuxred}{\textbf{Information and Computing Sciences}}%%
  \textcolor{uuxred}{\textbf{]}}}%
\newcommand{\cs@dutchlogo}{%
  \raggedleft%
  \sffamily%
  \textcolor{uuxred}{\textbf{[}}%%
  Faculteit \textbf{B\`etawetenschappen}\\%
  \textcolor{uuxred}{\textbf{Informatica}}%
  \textcolor{uuxred}{\textbf{]}}}%
\newcommand{\cs@logo}{%
  \renewcommand{\sfdefault}{cmss}
  \iflang@dutch\cs@dutchlogo\else\cs@englishlogo\fi}%

\setbeamertemplate{head}{}
\setbeamertemplate{foot}{}
\setbeamertemplate{navigation symbols}{}

\ifhelvet
  \renewcommand{\sfdefault}{phv}
\else
  \renewcommand{\sfdefault}{cmss}
\fi

\renewcommand{\ttdefault}{cmtt}

\renewcommand{\emph}[1]{\textcolor{uuxred}{#1}}

\usefonttheme[onlymath]{serif}

%% ----------------------------------------------------------------------------
%% inner theme

\setlength{\parskip}{0.25cm}

\setbeamerfont{title}{series=\bfseries,size=\Large}

\setbeamertemplate{title page}{%
  \vspace{2.5cm}%
  \begin{center}%
    {\usebeamerfont{title}\textcolor{uuxred}{\inserttitle}}%
    \ifx\insertsubtitle\@empty%
    \else%
      \par{\usebeamerfont{subtitle}\textcolor{uuxred}{\insertsubtitle}}%
    \fi%
    \par\large\insertauthor%
    \par\footnotesize\insertinstitute%
    \par\small\insertdate%
    \vfill%
  \end{center}}

\newcommand{\section@number}{}%

\setbeamercolor{frametitle}{fg=uuxred}
\setbeamerfont{frametitle}{series=\bfseries}
\setbeamertemplate{frametitle}{%
  \vspace{0.25cm}%
  \hspace{-1.5cm}%
  \usebeamerfont{frametitle}\usebeamercolor{frametitle}\insertframetitle%
  \normalfont\normalsize\hfill\section@number}

\newcommand{\section@page}{%
  \hspace{-1cm}%
  \parbox{11.3cm}{%
    \begin{center}%
      \usebeamerfont{frametitle}%
      \usebeamercolor[fg]{frametitle}%
      \thesection.\ \,\insertsection%
    \end{center}}}

\newcommand{\section@pagestar}{%
  \hspace{-1cm}%
  \parbox{11.3cm}{%
    \begin{center}%
      \usebeamerfont{frametitle}%
      \usebeamercolor[fg]{frametitle}%
      \insertsection%
    \end{center}}}

\newcommand{\sectionheader}{\S\thesection}

\ifsection@pages

  \AtBeginSection%
    [\begin{frame}%
       \section@pagestar%
     \end{frame}%   
     \let\section@number\relax]%
    {\begin{frame}%
       \section@page%
     \end{frame}%
     \let\section@number\sectionheader}
  
  \newcommand{\subsection@page}{%
    \hspace{-1cm}%
    \parbox{11.3cm}{%
      \begin{center}%
        \usebeamerfont{frametitle}%
        \usebeamercolor[fg]{frametitle}%
        \thesection.\thesubsection\ \,\insertsubsection%
      \end{center}}}
  
  \newcommand{\subsection@pagestar}{%
    \hspace{-1cm}%
    \parbox{11.3cm}{%
      \begin{center}%
        \usebeamerfont{frametitle}%
        \usebeamercolor[fg]{frametitle}%
        \insertsubsection%
      \end{center}}}
  
  \AtBeginSubsection%
    [\begin{frame}%
       \subsection@pagestar%
     \end{frame}%
     \renewcommand{\section@number}{}]
    {\begin{frame}%
       \subsection@page%
     \end{frame}%
     \renewcommand{\section@number}{\S\thesection.\thesubsection}}

\fi