#!/usr/bin/env bash
# Toolchain preflight for supertensor. Run this BEFORE drawing anything:
# it decides whether the TikZ path is available or the figure must fall back.
#
#   ./scripts/preflight.sh          human-readable report
#   ./scripts/preflight.sh --quiet  exit code only (0 = full TikZ path OK)
#
# Exit codes: 0 full path, 1 degraded (no CJK), 2 no LaTeX at all.
set -uo pipefail

QUIET=0
[[ "${1:-}" == "--quiet" ]] && QUIET=1
say() { [[ $QUIET -eq 1 ]] || echo -e "$*"; }

ok=0; warn=0; fail=0; cjk_warn=0; export_warn=0
check() { # name, command
  local name="$1"; shift
  if "$@" >/dev/null 2>&1; then say "  ok    $name"; ok=$((ok+1)); return 0
  else say "  MISS  $name"; return 1; fi
}

say "supertensor preflight"
say "--- required ---"
check "xelatex"            command -v xelatex            || fail=$((fail+1))
check "standalone.cls"     kpsewhich standalone.cls      || fail=$((fail+1))
check "tikz.sty"           kpsewhich tikz.sty            || fail=$((fail+1))
check "xstring.sty"        kpsewhich xstring.sty         || fail=$((fail+1))

say "--- chinese figures ---"
check "ctex.sty"           kpsewhich ctex.sty            || { warn=$((warn+1)); cjk_warn=1; }
check "fandol font"        kpsewhich FandolSong-Regular.otf || { warn=$((warn+1)); cjk_warn=1; }

say "--- raster / vector export ---"
check "pdftocairo"         command -v pdftocairo         || { warn=$((warn+1)); export_warn=1; }
check "latexmk (optional)" command -v latexmk            || true

if [[ $fail -gt 0 ]]; then
  say ""
  say "RESULT: no usable LaTeX path."
  say "Fall back to an SVG or matplotlib figure and say so explicitly in the"
  say "delivery; do not silently ship a lower-fidelity figure as if it were TikZ."
  exit 2
fi
if [[ $warn -gt 0 ]]; then
  say ""
  say "RESULT: degraded."
  if [[ $cjk_warn -eq 1 ]]; then
    say "  - missing ctex/fandol  -> English-label figures only; do not substitute"
    say "    an OS-specific CJK font without telling the user it costs portability."
  fi
  if [[ $export_warn -eq 1 ]]; then
    say "  - missing pdftocairo   -> deliver PDF only, and say PNG/SVG were skipped."
  fi
  exit 1
fi
say ""
say "RESULT: full path available (TikZ + CJK + vector/raster export)."
exit 0