\NeedsTeXFormat{LaTeX2e}
\ProvidesExplPackage{PrimeTeX/packages/Header}{2025-08-16}{1.0}{
	Customize header and footer layout and contents.
}

\RequirePackage{PrimeTeX/packages/Layout}

\dim_new:N \g_header_insideoffset_dim 
\dim_set:Nn \g_header_insideoffset_dim {\c_BigFloat_overhang_dim}
\dim_new:N \g_header_outsideoffset_dim 
\dim_set:Nn \g_header_outsideoffset_dim {
	\fp_to_dim:n {\c_BigFloat_overhang_dim * \c_BigFloat_offset_fp}
}

\ProvideLength{\HeaderInsideOffset}[\BigFloatOverhang]
\ProvideLength{\HeaderOutsideOffset}[\BigFloatOverhang * \real{\BigFloatOffset}]

% Header & Footer Options
\RequirePackage{fancyhdr}
\pagestyle{fancy}

% Clear all header & footer formatting.
\fancyhf{}

\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}

\NewDocumentCommand{\chapappname}{}{Chapter \thechapter{}: }
\NewDocumentCommand{\partlabel}{}{\partname{} \thepart{}: \parttitle}

\NewDocumentCommand{\Appendix}{}{
	\appendix
	\RenewDocumentCommand{\chapappname}{}{Appendix \thechapter{}: }
	\RenewDocumentCommand{\partlabel}{}{}
}

\NewDocumentCommand{\BackMatter}{}{
	\RenewDocumentCommand{\chapappname}{}{}
	\RenewDocumentCommand{\partlabel}{}{}
}

\NewDocumentCommand{\parttitle}{}{}

\renewcommand{\chaptermark}[1]{\markboth{#1}{}}

\fancypagestyle{fancy}{
	\ifthenelse{\boolean{isElectronic}}{
		\fancyhfoffset[L]{\HeaderInsideOffset}
		\fancyhfoffset[R]{\HeaderOutsideOffset}
		\fancyhead[L]{\partlabel}
		\fancyhead[R]{\chapappname{}\leftmark}

		\fancyfoot[R]{\thepage}
	}{
		\fancyhfoffset[LE,RO]{\HeaderOutsideOffset}
		\fancyhead[LE]{\partlabel}
		\fancyhead[RO]{\chapappname\leftmark}

		\fancyfoot[LE,RO]{\thepage}
	}
}

\fancypagestyle{plain}{ %
	\fancyhf{} % remove everything
	\renewcommand{\headrulewidth}{0pt} % remove lines as well
	\renewcommand{\footrulewidth}{0pt}

	\ifthenelse{\boolean{isElectronic}}{
		\fancyhfoffset[L]{\HeaderInsideOffset}
		\fancyhfoffset[R]{\HeaderOutsideOffset}
		\fancyfoot[R]{\thepage}
	}{
		\fancyhfoffset[LE,RO]{\HeaderOutsideOffset}
		\fancyfoot[LE,RO]{\thepage}
	}
}