% Task environment

\RequirePackage[usenames,dvipsnames]{xcolor}

\newcommand\taskname{Requisite}

% Tango Icon Theme Aluminum
\definecolor{taskrulecolor}{HTML}{2e3436}

\newcounter{taskc}
\setcounter{taskc}{0}
\renewcommand\thetaskc{\Roman{taskc}}

% stores the total low and high until reset
\newcounter{tasktmin}
\newcounter{tasktmax}

\newcounter{subtaskc}[taskc]
\setcounter{subtaskc}{0}
\renewcommand\thesubtaskc{%
  \thetaskc\thesubtaskc@part
}
\def\thesubtaskc@part{%
  \expandafter\ifnum\value{subtaskc}>0
    -\alph{subtaskc}%
  \fi
}

\newlength\taskspace
\newenvironment{task}[1][]%
  {%
    \goodbreak
    \setlength\taskspace{2ex}%
    \refstepcounter{taskc}%
    \vspace{-0.5\parskip}%
    \textcolor{taskrulecolor}{%
      \leavevmode\llap{\rule{\marginparwidth}{1pt}}%
      \rule{\textwidth}{1pt}%
    }%
    \vspace{-0.5\baselineskip}%
    \begin{@task}[#1]%
  }%
  {%
    \end{@task}%
    \vspace{-0.85\baselineskip}%
    \textcolor{taskrulecolor}{%
      \leavevmode\llap{\rule{\marginparwidth}{2pt}}%
      \rule{\textwidth}{2pt}%
    }%
    \ignorespaces
  }


\newenvironment{subtask}[1][]%
  {%
    \goodbreak
    \list{}{%
      \leftmargin4ex
      \item\relax
    }%
    \setlength\taskspace{6ex}%
    \refstepcounter{subtaskc}%
    \begin{@task}[#1]%
  }%
  {%
    \end{@task}%
    \endlist
    \ignorespaces
  }



\newlength\@@subtaskcl
\newcount\@@hmin \newcount\@@hmax \newcount\@@hdiff \newcount\@@hconf
\newenvironment{@task}[1][]%
  {%
    \def\@@h{#1}%
    \goodbreak\leavevmode\@margin@sig
    \llap{%
      \raisebox{-1.8\baselineskip}[0em][0em]{%
        \shortstack{%
          {\sc\taskname}\space\thesubtaskc
          \\
          \vphantom{M}%
          \ifx\@@h\empty\else
            {\small\@task@h#1||\,h}%
          \fi%
          \\
          \vphantom{M}%
          \ifx\@@h\empty\else
            \@task@setregs#1||%
            {\scriptsize \the\@@hconf\% Confidence}%
            % advance the total counters
            \addtocounter{tasktmin}{\@@hmin}
            \addtocounter{tasktmax}{\@@hmax}
          \fi%
        }%
        \hspace{\the\taskspace}%
        % adjust width of the subtask text so that the task number lines up
        \settowidth\@@subtaskcl{\thesubtaskc@part}%
        \hspace{-\the\@@subtaskcl}%
      }%
    }%
    \ignorespaces
  }%
  {\goodbreak\ignorespaces}


\def\@task@h#1-#2||{%
  #1%
  \ifnum#1=#2\else
    --#2%
  \fi
}

\def\@task@setregs#1-#2||{%
  \@@hmin#1\relax
  \@@hmax#2\relax
  % perform calculation (be sure to multiply by 100 before dividing, otherwise
  % we lose everything through integer truncation); the calculation is:
  % 100 - ((|N-M|/M)*100)
  \@@hdiff#2\relax \advance\@@hdiff-#1\relax
  \@@hconf\@@hdiff
  \multiply\@@hconf by 100\relax
  \divide\@@hconf by-\@@hmax
  \advance\@@hconf by 100\relax
}


\newcommand\tasksummary{{%
  \subsection{Summary}
  \pnumoff
  \edef\@@range{\arabic{tasktmin}-\arabic{tasktmax}}%
  \par {\sc Time Interval:} \expandafter\@task@h\@@range|| Hours%
  % determine confidence
  \expandafter\@task@setregs\@@range||%
  \par {\sc Confidence:} \the\@@hconf\%%
  % reset counters
  \setcounter{tasktmin}{0}%
  \setcounter{tasktmax}{0}%
  \pnumrest
}}
