% beamerthemeMirage.sty v1.1 2024/10/24
% by LianTze Lim (liantze@gmail.com)
% A beamer theme inspired by Zhou Shen's `Mirage' song  poster
% 基于周深《反深代词》先行曲《蜃楼》歌曲海报色调的beamer主题
\ProvidesPackage{beamerthemeMirage}

\newif\ifMirage@light
\DeclareOptionBeamer{light}{\Mirage@lighttrue}    
\ProcessOptionsBeamer

\RequirePackage{regexpatch}
\RequirePackage[fixed]{fontawesome5}
\RequirePackage{relsize}

\definecolor{MirageGray0}{RGB}{30,30,30}
\definecolor{MirageGray1}{RGB}{48,48,48}
\definecolor{MirageGray2}{RGB}{140,140,140}
\definecolor{MirageGray3}{RGB}{60,66,71}
\definecolor{MiragePink}{RGB}{212,183,183}
\definecolor{MirageBlue}{RGB}{156,185,220}

\ifMirage@light
  \setbeamercolor{normal text}{fg=MirageGray3,bg=white}
  \setbeamercolor{structure}{fg=MirageBlue!80!MirageGray0}
  \setbeamercolor{item}{fg=MirageBlue!50!MirageGray0}
\else
  \setbeamercolor{normal text}{bg=MirageGray3,fg=white}
  \setbeamercolor{structure}{fg=MirageBlue}
  \setbeamercolor{item}{fg=MirageBlue!70!MirageGray0}
\fi
\setbeamercolor{alerted text}{fg=MiragePink!60!red!80!MirageGray0}
\setbeamercolor{section in head/foot}{fg=structure!80}
\setbeamercolor{page number in head/foot}{fg=structure!80}

\xpatchcmd{\beamerboxesrounded}{#2}{\vspace*{0.5ex}#2\vspace*{0.5ex}}{}{}
\xpatchcmd{\beamerboxesrounded}{\vskip2pt}{\vskip0.5ex}{}{}
\pretocmd{\endbeamerboxesrounded}{\par\vspace*{0.5ex}}{}{}
\usetheme[compress]{Singapore}
\setbeamertemplate{blocks}[rounded]

\setbeamerfont{block title}{family=\rmfamily,series=\bfseries}

\ifMirage@light
  \setbeamercolor{block body}{bg=MirageBlue!90,fg=MirageBlue!40!black}
\else
  \setbeamercolor{block body}{fg=MirageBlue,bg=MirageBlue!40!black}
\fi
\setbeamercolor{block title}{fg=MirageBlue!90,bg=MirageBlue!30!black}

\setbeamercolor{block body example}{fg=MirageGray3,bg=MirageBlue!40}
\setbeamercolor{block title example}{bg=MirageBlue!90,fg=MirageBlue!30!black}

\setbeamercolor{block body alerted}{fg=MirageGray3,bg=MiragePink!30}
\ifMirage@light
  \setbeamercolor{block title alerted}{fg=MiragePink!60!red!80!MirageGray0,bg=MiragePink!80}
\else
  \setbeamercolor{block title alerted}{fg=MiragePink!60!red!80!MirageGray0,bg=MiragePink}
\fi

\newcommand{\MirageProofPrefix}{\faEllipsisH}
\newcommand{\MirageTheoremPrefix}{\faChevronCircleRight}

\addtobeamertemplate{proof begin}{%
  \let\oldinsertproofname\insertproofname%
  \def\insertproofname{{\color{block title.fg!50!block title.bg}\relsize{-1}\MirageProofPrefix}\oldinsertproofname}%
}{}

\addtobeamertemplate{theorem begin}{%
  \let\oldinserttheoremname\inserttheoremname%
  \def\inserttheoremname{{\color{block title.fg!50!block title.bg}\relsize{-1}\MirageTheoremPrefix}\oldinserttheoremname}%
}{}


\ifMirage@light
  \setbeamercolor{pullquote}{fg=MiragePink!90!normal text.fg}
\else
  \setbeamercolor{pullquote}{fg=MiragePink}
\fi
\setbeamerfont{pullquote}{family=\rmfamily,size=\Large,shape=\itshape}
\newcommand{\MiragePullquoteOpen}{\faQuoteLeft}
\newcommand{\MiragePullquoteClose}{\faQuoteRight}
\newenvironment{pullquote}{%
  \usebeamercolor{pullquote}%
  \color{pullquote.fg!15!normal text.bg}\hrule width \hsize height 0.15ex\vskip2ex%
  \begin{beamercolorbox}[colsep=1ex,leftskip=1em]{pullquote}%
  \usebeamerfont{pullquote}%
  \raisebox{0pt}[0pt][0pt]{\makebox[0pt]{\color{pullquote.fg!30!normal text.bg}\hskip-1em\huge\MiragePullquoteOpen}}%
  \ignorespaces%
}{%
  \end{beamercolorbox}%
  \vskip2ex\hrule width \hsize height 0.15ex%
}


\setbeamertemplate{itemize items}[circle]
\setbeamertemplate{navigation symbols}{}
\setbeamertemplate{frametitle continuation}[from second]
\ifMirage@light
    \pgfdeclareverticalshading{mirage@headfade}{\the\paperwidth}{%
      color(0ex)=(white);%
      color(0.2ex)=(MirageBlue);%
      color(1.3ex)=(MiragePink);%
      color(1.7ex)=(white)%
    }
\else
    \pgfdeclareverticalshading{mirage@headfade}{\the\paperwidth}{%
      color(0ex)=(MirageGray0);%
      color(0.2ex)=(MirageBlue);%
      color(1.3ex)=(MiragePink);%
      color(1.7ex)=(MirageGray1)%
    }
\fi
\addtobeamertemplate{headline}{}{%
  \vskip1ex%
  \pgfpathrectangle{\pgfpoint{0pt}{0pt}}{\pgfpoint{\paperwidth}{1.7ex}}
  \pgfuseshading{mirage@headfade}
  \vskip-2ex%
}{}

\RequirePackage{tikz}
\usetikzlibrary{shadows}

\pgfdeclareradialshading{tikz@lib@fade@circle@50}{\pgfpointorigin}{
  color(0pt)=(pgftransparent!0); color(20bp)=(pgftransparent!0);
  color(25bp)=(pgftransparent!100); color(80bp)=(pgftransparent!100)}%
\pgfdeclarefading{circle with fuzzy edge 50 percent}{\pgfuseshading{tikz@lib@fade@circle@50}}%

\newcommand{\MirageFootlineContents}{\insertframenumber{} of \inserttotalframenumber{}}
\newlength{\MirageGlowRadius}
\setlength{\MirageGlowRadius}{0.2ex}
\newbox{\Mirage@smalleclipse}
\AddToHook{begindocument/before}{
  \savebox{\Mirage@smalleclipse}{%
    \usebeamercolor{normal text}%
    \tikz{\node[anchor=center,circle,circular glow={fill=MiragePink,shadow scale=2.5, path fading={circle with fuzzy edge 50 percent}},draw=normal text.fg,fill=normal text.fg,outer sep=0pt,inner sep=\MirageGlowRadius](O){};%
    \draw[line width=0.1ex,draw=normal text.fg](0.3ex,0pt) -- ++(0.75\paperwidth,0pt);%
    }%
  }%
}

\setbeamertemplate{footline}{%
  \begin{beamercolorbox}[ht=2.5ex,dp=1ex,right,sep=0.5ex]{page number in head/foot}%
  \leavevmode\usebox{\Mirage@smalleclipse}%
  \vskip-1ex%
  \MirageFootlineContents\hspace*{1ex}%
  \end{beamercolorbox}%
}{}

\setbeamertemplate{frametitle}[default][left]
\AddToHook{begindocument}{
\ifdefined\addfontfeatures
  \setbeamerfont{title}{family=\rmfamily\addfontfeatures{LetterSpace=5}}
\else
  \RequirePackage[letterspace=50]{microtype}
  \setbeamerfont{title}{family=\rmfamily\lsstyle}
\fi
}
\setbeamerfont{title}{size=\LARGE,series=\bfseries}
\setbeamerfont{frametitle}{family=\rmfamily,size=\Large,series=\bfseries}

\newcommand{\MirageFrametitlePrefix}{\faBorderStyle}
\addtobeamertemplate{frametitle}{%
  \let\oldinsertframetitle\insertframetitle%
  \renewcommand{\insertframetitle}{{\relsize{-1}\color{frametitle.fg!50!frametitle.bg}\MirageFrametitlePrefix}\oldinsertframetitle}%
}