this code is building from the solution given here where an image is added to the headers. In the code from the Legrande Orange Template given here, the programmer uses a switch like \chapterimage{chapter_head_1.pdf} to change the images that appear in the chapter headers.
Is there a similar approach that can be employed to switch the header chapter images using a similar "switching" approach to the code given below instead of re-typing and changing the \fancyhead[O] and \fancyhead[E] environments for each chapter?
Here is the original code:
\documentclass[11pt,a4paper]{book}
\usepackage{calc}
\usepackage[left=1.5cm, right=1.5cm, bindingoffset=1.5cm, headheight=120pt, top={120pt+10mm}]{geometry}
\usepackage{fancyhdr}
\usepackage{titlesec}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage{fourier}
\usepackage{etoolbox}
\patchcmd{\chapter}{\thispagestyle{plain}}{\thispagestyle{fancy}}{}{}
\definecolor{gmitblue}{RGB}{93,138,168}
\definecolor{line}{RGB}{70,160,216}
\usetikzlibrary{calc}
\renewcommand{\headrulewidth}{0pt}
\newcommand\hdheight{1in}
\newcommand\ftheight{.5in}
\pagestyle{fancy}
\fancyhf{}
\fancyhead[O]{%
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.north west) rectangle ($(current page.north east)+(0,-\hdheight)$);
\draw[line] ([yshift=-\hdheight]current page.north west) -- ([yshift=-\hdheight]current page.north east);
\ifnum\value{chapter}=0
\node[anchor=south west, text width=11.5cm, text=white, font=\fontsize{.7cm}{1.5cm}\selectfont\bfseries] at ($(current page.north west)+(.5\hdheight,-\hdheight)$) {\raggedleft\rightmark};
\else
\node[anchor=south west, text width=2cm, text=white, font=\fontsize{2cm}{1.5cm}\selectfont\bfseries] (oddpagenum) at ($(current page.north west)+(.5\hdheight,-\hdheight)$) {\thechapter};
\node[anchor=south west, text width=11.5cm, text=white, font=\fontsize{.5cm}{1.5cm}\selectfont\bfseries] (chapter) at (oddpagenum.south east) {\quad TOPIC TO BE DISCUSSED};
\fi
\node[anchor=north east, inner xsep=5mm] at (current page.north east) {\includegraphics[height=120pt]{example-image-a}};
\end{tikzpicture}%
}
\fancyhead[E]{%
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.north west) rectangle ($(current page.north east)+(0,-\hdheight)$);
\draw[line] ([yshift=-\hdheight]current page.north west) -- ([yshift=-\hdheight]current page.north east);
\node[anchor=south east, text width=7cm, text=white, font=\fontsize{.7cm}{1.5cm}\selectfont\bfseries] (evenpagenum) at ($(current page.north east)+(-.5\hdheight,-\hdheight)$) {\raggedleft\rightmark};
\node[anchor=north west, inner xsep=5mm] at (current page.north west) {\includegraphics[height=120pt]{example-image-b}};
\end{tikzpicture}%
}
\fancyfoot[CE]{
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.south west) rectangle ($(current page.south east)+(0,.5in)$);
\node[anchor=south west, text=white, font=\Large\bfseries, minimum size=.5in] at (current page.south west) {\thepage};
\node[anchor=south, text=white, font=\large, minimum size=.5in] at (current page.south) {\leftmark};
\node[anchor=south east, text=white, font=\large, minimum size=.5in, inner xsep=5mm] at (current page.south east) {\today};
\end{tikzpicture}%
}
\fancyfoot[CO]{
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.south west) rectangle ($(current page.south east)+(0,.5in)$);
\node[anchor=south west, text=white, font=\large, minimum size=.5in, inner xsep=5mm] at (current page.south west) {\today};
\node[anchor=south, text=white, font=\large, minimum size=.5in] at (current page.south) {\leftmark};
\node[anchor=south east, text=white, font=\Large\bfseries, minimum size=.5in] at (current page.south east) {\thepage};
\end{tikzpicture}%
}
\title{A reasonably long title}
\date{\today}
\author{The author}
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{}{0pt}{\Huge}
\titlespacing*{\chapter} {0pt}{20pt}{40pt}
\begin{document}
\maketitle
\tableofcontents
\listoffigures
%have a different header image here
\chapter{Problem 1}
\section{Problem 1}
\lipsum[1]
\section{Solution 1}
\lipsum
\lipsum
%have a different header image here - say like the "example-image-d" and "example-image-e" images
\chapter{Problem 2}
\section{Problem 2}
\lipsum[1]
\end{document}