#!/usr/bin/env bash
# Build a CS6513 IEEE .tex file (-> matching .pdf).
# Usage:
#   ./paper/build.sh              # builds main.tex   (the submission)
#   ./paper/build.sh ref_draft    # builds ref_draft.tex (personal reference)
#   ./paper/build.sh main.tex     # .tex extension optional
set -euo pipefail
cd "$(dirname "$0")"

# Which document to build (default: main). Accept an optional first arg, with or
# without a trailing ".tex".
MAIN="${1:-main}"
MAIN="${MAIN%.tex}"

if [ ! -f "$MAIN.tex" ]; then
  echo "No such file: $MAIN.tex (in $(pwd))" >&2
  exit 1
fi

# Pick up a TeX toolchain that may be installed but not on PATH (MacTeX / TeX Live).
for d in /Library/TeX/texbin /usr/local/texlive/*/bin/* /opt/homebrew/bin; do
  if [ -d "$d" ]; then PATH="$d:$PATH"; fi
done
export PATH

if command -v latexmk >/dev/null 2>&1; then
  echo "Building with latexmk..."
  latexmk -pdf -interaction=nonstopmode -halt-on-error "$MAIN.tex"
elif command -v pdflatex >/dev/null 2>&1; then
  echo "Building with pdflatex (two passes to resolve \\cite references)..."
  pdflatex -interaction=nonstopmode -halt-on-error "$MAIN.tex"
  pdflatex -interaction=nonstopmode -halt-on-error "$MAIN.tex"
elif command -v tectonic >/dev/null 2>&1; then
  echo "Building with tectonic..."
  tectonic "$MAIN.tex"
else
  cat >&2 <<'EOF'
No LaTeX engine found (looked for latexmk, pdflatex, tectonic).
Install one, then re-run this script:
  Tectonic  (lightest, self-contained ~30MB, fetches packages on demand):
      brew install tectonic
  BasicTeX  (small TeX Live ~100MB; may need `sudo tlmgr install` for extras):
      brew install --cask basictex
  MacTeX    (full TeX Live ~4GB, everything included):
      brew install --cask mactex-no-gui
EOF
  exit 1
fi

echo "OK -> $(pwd)/$MAIN.pdf"