;; Org-mode LaTeX export settings
(require 'ox-latex)

;; Add custom LaTeX packages
(setq org-latex-packages-alist '(("" "listings")
                                 ("" "booktabs")
                                 ("AUTO" "polyglossia" t ("xelatex" "lualatex"))
                                 ("" "grffile")
                                 ("" "unicode-math")
                                 ("" "xcolor")))

;; Define the process to convert Org to PDF using XeLaTeX
(setq org-latex-pdf-process '("latexmk -xelatex -shell-escape -quiet -f %f"))

;; Set the compiler to XeLaTeX
(setq org-latex-compiler "xelatex")

;; Enable listings and other table-related features
(setq org-latex-listings t)
(setq org-latex-tables-booktabs t)
(setq org-latex-images-centered t)

;; Customize the appearance of listings (source code blocks)
(setq org-latex-listings-options
      '(("basicstyle" "\\ttfamily")
        ("showstringspaces" "false")
        ("keywordstyle" "\\color{blue}\\textbf")
        ("commentstyle" "\\color{gray}")
        ("stringstyle" "\\color{green!70!black}")
        ("stringstyle" "\\color{red}")
        ("frame" "single")
        ("numbers" "left")
        ("numberstyle" "\\ttfamily")
        ("columns" "fullflexible")))

;; Set the input encoding
(setq org-latex-inputenc-alist '((\"utf8\" . \"utf8x\")))

;; Define custom LaTeX class with specific formatting
(with-eval-after-load 'ox-latex
  (add-to-list 'org-latex-classes
               '("koma-general"
                 "\\documentclass[a4paper,10pt,captions=tableheading,twoside=false]{scrartcl}
  \\linespread{1.25}
  \\usepackage{fontspec}
  \\defaultfontfeatures{Mapping=tex-text, RawFeature={+zero}}
  \\setmainfont{Noto Sans}[BoldFont=*-Medium,ItalicFont=*-Italic]
  \\setsansfont{Noto Sans}[BoldFont=*-Medium,ItalicFont=*-Italic]
  \\setmonofont{Noto Sans Mono}[BoldFont=*-Medium,Scale=0.8]
  \\usepackage{geometry}
  \\geometry{a4paper,left=2cm,right=2cm,top=1.6cm,bottom=1.6cm}
  \\usepackage{fancyhdr}
  \\pagestyle{fancy}
  \\fancyhf{}
  \\fancyhead[L]{\\leftmark}  % Left header
  \\fancyhead[R]{\\thepage}  % Right header"
                 ("\\section{%s}" . "\\section*{%s}")
                 ("\\subsection{%s}" . "\\subsection*{%s}")
                 ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
                 ("\\paragraph{%s}" . "\\paragraph*{%s}")
                 ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))))

;; Set default LaTeX class
(setq org-latex-default-class "koma-general")

;; Load KOMA letter support
(eval-after-load 'ox '(require 'ox-koma-letter))

;; TeX mode settings for editing .tex files
(setq TeX-auto-save t) ; Enable auto-save
(setq TeX-electric-math (cons "$" "$")) ; Shortcut for math mode
(if (eq system-type 'windows-nt)
    (progn
      (setq TeX-view-program-list '(("SumatraPDF" "SumatraPDF.exe %o")))
      (setq TeX-view-program-selection '((output-pdf "SumatraPDF"))))
    (setq TeX-view-program-selection '((output-pdf "Evince"))))
(setq TeX-source-correlate-start-server t) ; Enable source-correlate
(setq TeX-master nil) ; Default master file
(setq TeX-engine 'xetex) ; Set engine to XeTeX
(setq TeX-command-extra-options "-shell-escape") ; Allow shell escape

(use-package tex
             :defer t
             :ensure auctex
             :hook ((LaTeX-mode . turn-on-reftex)
                    (LaTeX-mode . flyspell-mode)
                    (LaTeX-mode . LaTeX-math-mode)))