#!/bin/sh
# M2make regression tests. Builds M2make with both compilers (via the
# sibling build scripts) and exercises ordering, up-to-date checks,
# rebuilds, cycles, and real builds.
# Usage: ./run_tests.sh   (from the tools/m2make directory)
pass=0; fail=0

ok() { pass=$((pass+1)); echo "PASS: $1"; }
no() { fail=$((fail+1)); echo "FAIL: $1"; }

# --- bootstrapping: both compilers must build M2make ---
./build_gm2.sh > /tmp/m2make_t.log 2>&1
if [ -x b_gm2/M2make ]; then ok "gm2 builds M2make"; else no "gm2 builds M2make"; fi
./build_m2.sh > /tmp/m2make_t.log 2>&1
if [ -x b_v3/M2make ]; then ok "M2 builds M2make"; else no "M2 builds M2make"; fi

GM2=b_gm2/M2make
V3M=b_v3/M2make

# --- dry-run ordering (both binaries must agree) ---
for bin in "$GM2" "$V3M"; do
  out=$($bin -n -c gm2 tests/Main2.mod 2>&1)
  calc_line=$(printf '%s\n' "$out" | grep -n "Calc :" | cut -d: -f1)
  main_line=$(printf '%s\n' "$out" | grep -n "M2makeMain" | cut -d: -f1)
  if [ -n "$calc_line" ] && [ -n "$main_line" ] && [ "$calc_line" -lt "$main_line" ]; then
    ok "$bin order (Calc before Main2)"
  else
    no "$bin order (Calc before Main2): $out"
  fi
  case "$out" in
    *"Add"*) no "$bin leaks FROM-items as modules: $out" ;;
    *) ok "$bin ignores FROM-items" ;;
  esac
done

# --- cycle detection ---
for bin in "$GM2" "$V3M"; do
  out=$($bin -n -c gm2 tests/CycA.mod 2>&1); rc=$?
  case "$out" in
    *"cyclic import"*) ok "$bin reports cycle" ;;
    *) no "$bin reports cycle: $out" ;;
  esac
  if [ "$rc" = "1" ]; then ok "$bin cycle exit code 1"; else no "$bin cycle exit code ($rc)"; fi
done

# --- real gm2 build, run, up-to-date, rebuild ---
rm -f Main2 *.o
if $GM2 -c gm2 -o Main2 tests/Main2.mod > /tmp/m2make_t.log 2>&1; then
  ok "gm2-mode real build"
else
  no "gm2-mode real build"
fi
if [ "$(./Main2 2>/dev/null)" = "ok42" ]; then
  ok "gm2-built program runs (ok42)"
else
  no "gm2-built program runs"
fi
out=$($GM2 -c gm2 -o Main2 tests/Main2.mod 2>&1)
case "$out" in
  *"up to date"*) ok "gm2-mode up-to-date skip" ;;
  *) no "gm2-mode up-to-date skip: $out" ;;
esac
sleep 1
touch tests/Calc.mod
out=$($GM2 -c gm2 -o Main2 tests/Main2.mod 2>&1)
case "$out" in
  *"-c tests/Calc.mod"*) ok "gm2-mode recompiles touched dep" ;;
  *) no "gm2-mode recompiles touched dep: $out" ;;
esac
touch tests/Calc.def tests/Calc.mod tests/Main2.mod

# --- real m2 build via the V3-built M2make ---
rm -rf gen_ssa Main m2make.log
if $V3M -c m2 --m2bin ../../compiler/M2 --shim ../../runtime/syslib/shim.c \
     -I ../../stdlib -o Main tests/Main.mod > /tmp/m2make_t.log 2>&1; then
  ok "m2-mode real build (V3 M2make)"
else
  no "m2-mode real build (V3 M2make)"
fi
if ./Main 2>/dev/null | grep -q "42"; then
  ok "m2-built program runs (42)"
else
  no "m2-built program runs"
fi
out=$($V3M -c m2 --m2bin ../../compiler/M2 --shim ../../runtime/syslib/shim.c \
  -I ../../stdlib -o Main tests/Main.mod 2>&1)
case "$out" in
  *"up to date"*) ok "m2-mode up-to-date skip" ;;
  *) no "m2-mode up-to-date skip: $out" ;;
esac

# --- cross-check: gm2-built M2make drives an m2 build too ---
rm -rf gen_ssa MainX m2make.log
if $GM2 -c m2 --m2bin ../../compiler/M2 --shim ../../runtime/syslib/shim.c \
     -I ../../stdlib -o MainX tests/Main.mod > /tmp/m2make_t.log 2>&1 \
     && ./MainX 2>/dev/null | grep -q "42"; then
  ok "gm2-built M2make drives m2 build"
else
  no "gm2-built M2make drives m2 build"
fi

rm -f Main MainX Main2 *.o
rm -rf gen_ssa
rm -f m2make.log

echo "--- $pass passed, $fail failed ---"
[ "$fail" -eq 0 ]