#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

initial_pwd=$(pwd)
filename=""
dirname=""
mupdf_pid="0"
input_suffix=".tex"
probe_suffix="tex"
output_suffix=".pdf"

get_filename() {
  local base="$(basename "${1}")"
  filename="${base%.*}"
}

get_dirname() {
  dirname="$(dirname "${1}")"
}

probe_extension() {
  local extension="${1##*.}"
  if [ "${extension}" != "${probe_suffix}" ]; then
    echo "File extension (${extension}) is not ${probe_suffix}. Exiting..."
    exit 1
  fi
  return 0
}

probe_tools() {
  if [ ! -x /usr/bin/pdflatex ]; then
    echo "/usr/bin/pdflatex not available. Exiting..."
    exit 1
  fi
  if [ ! -x /usr/bin/bibtex ]; then
    echo "/usr/bin/bibtex not available. Exiting..."
    exit 1
  fi
  if [ ! -x /usr/bin/mupdf ]; then
    echo "/usr/bin/mupdf not available. Exiting..."
    exit 1
  fi
  return 0
}

create_pdf() {
  cd "${dirname}"
  set +e
  pdflatex \
    -interaction=nonstopmode \
    -shell-escape \
    "${filename}${input_suffix}" > /dev/null
  bibtex "${filename}.aux"
  makeglossaries "${filename}"
  pdflatex \
    -interaction=nonstopmode \
    -shell-escape \
    "${filename}${input_suffix}" > /dev/null
  pdflatex \
    -interaction=nonstopmode \
    -shell-escape \
    "${filename}${input_suffix}"
  set -e
  cd "${initial_pwd}"
  return 0
}

check_mupdf_pid() {
  set +e
  mupdf_pid="$(ps aux | grep "mupdf ${dirname}/${filename}${output_suffix}" | grep -v "grep" | awk '{print $2}')"
  set -e
}

show_pdf() {
  check_mupdf_pid
  echo "mupdf: ${dirname}/${filename}${output_suffix}."
  if [ -n "$mupdf_pid" ]; then
    kill -SIGHUP "${mupdf_pid}"
  else
   DISPLAY=':0' mupdf "${dirname}/${filename}${output_suffix}" &
  fi
}

cleanup() {
  rm -f "${dirname}/"*.{acn,acr,alg,aux,bbl,bcf,blg,dvi,glg,glo,gls,glsdefs,idx,ist,lof,log,lol,lot,nav,out,run.xml,snm,toc,upa,upb,vrb,xdy} \
    "${dirname}/"*/*.{acn,acr,alg,aux,bbl,bcf,blg,dvi,glg,glo,gls,glsdefs,idx,ist,lof,log,lol,lot,nav,out,run.xml,snm,toc,upa,upb,vrb,xdy} \
    ./*.{acn,acr,alg,aux,bbl,bcf,blg,dvi,glg,glo,gls,glsdefs,idx,ist,lof,log,lol,lot,nav,out,run.xml,snm,toc,upa,upb,vrb,xdy} \
    ./*/*.{acn,acr,alg,aux,bbl,bcf,blg,dvi,glg,glo,gls,glsdefs,idx,ist,lof,log,lot,nav,out,run.xml,snm,toc,upa,upb,vrb,xdy}
}

render_diags() {
  echo "Rendering diagrams to pdfs."
  if [ -d "${dirname}/diag/" ] && [ -x /usr/bin/seqdiag ] ; then
    for _diag in "${dirname}/diag/"*.diag; do
      seqdiag -T 'pdf' "${_diag}"
    done
  fi
}

render_svgs() {
  echo "Rendering SVGs to pdfs."
  for dir in "${dirname}/images" "${dirname}/../images"; do
    if [ -d "${dir}" ]; then
      for svg in "${dir}/"*.svg; do
        if [ -f "${svg}" ]; then
          inkscape -D -z -A "${svg%\.svg}".pdf "${svg}"
        fi
      done
    fi
  done
}

probe_extension "$1"
get_filename "$1"
get_dirname "$1"
render_diags
render_svgs
echo "tex2pdf: Converting $filename$input_suffix to $filename$output_suffix."
probe_tools
create_pdf
cleanup
show_pdf

exit 0