#!/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"

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

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

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

function 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
}

function 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
}

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

function show_pdf()
{
  check_mupdf_pid
  echo "mupdf: ${dirname}/${filename}${output_suffix}."
  if [ ! -z $mupdf_pid ]; then
    kill -SIGHUP ${mupdf_pid}
  else
    mupdf ${dirname}/${filename}${output_suffix} &
  fi
}

function 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
        inkscape -D -z -A "${svg%\.svg}".pdf "${svg}"
      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