Right/left align chapter number and center the chapter title on the next page

Question

I want to left or right align my chapter number, and center the chapter title on the next page. I've used the \titlesec package, but it removes the header and footer on the first page of every chapter. The code I've written right aligns both the chapter number and the title. Is there any workaround?

\documentclass{report}

\usepackage{fancyhdr}
\usepackage{titlesec}

\titleformat{\chapter}[display]
{\normalfont\Large\bfseries\raggedleft}{\chaptertitlename\ \thechapter}
{20pt}{\Large}
\pagestyle{fancy}

\rhead{XYZ}

\lhead{year}

\lfoot{Blah}

\cfoot{}

\rfoot{\thepage}

\begin{document}

\chapter{Title}
Test
\end{document}

Answer 1

To have the header/footer in the first page of every chapter, you can patch (with the help of, for example, etoolbox package) the \chapter command to change the default plain style for fancy.

To have the chapter name+chapter number right (left aligned) you can use \filright (\filleft, respectively) in the second argument for \titleformat and then \filcenter in the fifth argument to have the title centered;

\documentclass{report}
\usepackage[a5paper,showframe]{geometry}% just for the example
\usepackage{fancyhdr}
\usepackage{titlesec}
\usepackage{etoolbox}
\usepackage{lipsum}% just to generate text for the example

\titleformat{\chapter}[display]
  {\normalfont\Large\bfseries}{\filleft\chaptertitlename\ \thechapter}
  {20pt}{\Large\filcenter}

\pagestyle{fancy}
\fancyhf{}
\fancyhead[R]{XYZ}
\fancyhead[L]{year}
\fancyfoot[L]{Blah}
\fancyfoot[R]{\thepage}

\patchcmd{\chapter}{\thispagestyle{plain}}{\thispagestyle{fancy}}{}{}

\begin{document}

\chapter{Test Title}
\lipsum[1-5]

\end{document}

I used the geometry package with its showframe option just to have a visual guideline.