\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{assign}[2015/09/23 v1.01 University assignments package]

% Author: 	Nathan Esau
%
% Packages included:	ifthen, hyperref, bookmark, color, enumerate, 
%						amsmath, fancyhdr, titlesec
% Options:				notesheader, links, hideanswers, hidequestions, 
%						assignheader
% Environments:			question, solution, example, exsolution, definition
% Commands:				ientry

%% Project Public License, as described in lppl.txt in the base
%% LaTeX distribution, either version 1.2 or (at your option)
%% any later version.

\RequirePackage{ifthen}
\RequirePackage{hyperref}
\RequirePackage{bookmark}
\RequirePackage{color}
\RequirePackage{enumerate}
\RequirePackage{amsmath}
\RequirePackage{fancyhdr}
\RequirePackage{titlesec}
\RequirePackage{amsthm}

\makeatletter

% Commands
\newcommand{\ebox}[1]{%
\hfill$\qed$
}

\newcommand{\ientry}[1]{%
\index{#1}\textbf{#1}}


% Counters
\newcounter{questioncounter}
\newcounter{solutioncounter}

% For hiding question environment
\newboolean{showquestions}
\setboolean{showquestions}{true}

% For hiding solution environment
\newboolean{showanswers}
\setboolean{showanswers}{true}

\DeclareOption{hideanswers}{\setboolean{showanswers}{false}}
\DeclareOption{hidequestions}{\setboolean{showquestions}{false}}

\DeclareOption{assignheader}{%
	\pagestyle{fancy}
	\fancyhf{}
	\renewcommand{\headrulewidth}{0pt}
	% Define rhead, lhead in assignment
	
	%\usepackage[margin=1.0in,headheight=27.18335pt]{geometry}
	\setlength{\headheight}{27.18335pt}
	\cfoot{\thepage}
}

\DeclareOption{notesheader}{%

% Format header
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\fancyhf{}
\renewcommand{\headrulewidth}{0pt}
\fancyhead[CE]{\textit{\nouppercase{\leftmark}}}
\fancyhead[CO]{\textit{\nouppercase{\rightmark}}}
\fancyhead[LE,RO]{\thepage}
\cfoot{}

% Format chapter
\titleformat{\chapter}[display]
{\bfseries\filcenter}
{\huge\thechapter}
{1ex}
{
\vspace{2ex}%
\LARGE}
[\vspace{0.5ex}%
{\titlerule[1.0pt]}
\vspace{10.0ex}
]
\titlespacing*{\chapter}{0pt}{-30pt}{40pt}

% Format section
\titleformat*{\section}{\centering\large\bfseries}
\titleformat*{\subsection}{\centering\normalsize\bfseries\itshape}
}

\DeclareOption{links}{%

% Hyper link setup
\hypersetup{
	colorlinks,
	linkcolor={blue},
	linktoc=page,
	urlcolor=blue
}

% 
}

\DeclareOption*{\PackageWarning{uassign}{Unknown ‘\CurrentOption’}}
\ProcessOptions\relax

% For hiding question and solution environments
\newsavebox{\trashcan}

% Question environment
\ifthenelse{\boolean{showquestions}}{%
	% show the questions
	\newenvironment{question}{%
	% 
	\bigskip
	\refstepcounter{questioncounter}
	\vspace{-5mm}
	\list{\thequestioncounter .}{%
    	\settowidth{\leftmargin}{10. \hskip\labelsep}%
   	 	\labelwidth\leftmargin\advance\labelwidth-\labelsep
   	 	\partopsep=0pt\bigskip
  	    \item 
  	    	\begingroup
		}% 
		\endgroup
		}{\endlist}}%
{%
	% don't show the questions
	\newenvironment{question}{%
	\begin{lrbox}{\trashcan}
	\begin{minipage}{5cm}	
	}%
	{%
	\end{minipage}
	\end{lrbox}}%
}
 
% Solution environment
\ifthenelse{\boolean{showanswers}}{%
	% show the answers 
	\newenvironment{solution}[1][1.5em]{%
	%
	\bigskip
	\refstepcounter{solutioncounter}
	\vspace{-5mm}
	\list{\ifthenelse{\boolean{showquestions}}{}{\thesolutioncounter .}}{%
    \settowidth{\leftmargin}{10. \hskip\labelsep}%
    \labelwidth\leftmargin\advance\labelwidth-\labelsep
    \partopsep=0pt\bigskip
    \ifthenelse{\boolean{showquestions}}{%
    	\bigskip \item[] \textbf{Solution: } \medskip \item[]}
    	{\item}%
    	\begingroup
	}%
	\endgroup
	}{\endlist}}%
{%
	% don't show the answers
	\newenvironment{solution}{%
	\begin{lrbox}{\trashcan}
	\begin{minipage}{5cm}	
	}%
	{%
	\end{minipage}
	\end{lrbox}}%
}

\newcounter{examplecounter}
%\numberwithin{examplecounter}{chapter}
\newcounter{exsolutioncounter}
%\numberwithin{solutioncounter}{chapter}
\newcounter{defcounter}
%\numberwithin{defcounter}{chapter}

% Example environment
\newenvironment{example}{
\bigskip
   \refstepcounter{examplecounter}
   \noindent\textbf{Example \theexamplecounter}
}{}

% Solution environment
\newenvironment{exsolution}{
\bigskip
    \refstepcounter{exsolutioncounter}
    \noindent\textbf{Solution \theexsolutioncounter}
    \begingroup
    \endgroup
}{}

% Definition environment
\newenvironment{definition}{
\bigskip
    \refstepcounter{defcounter}
    \noindent\textbf{Definition \thedefcounter}
}{}
  
\makeatother