#!/bin/bash
# Build A.EXE and B.EXE (16-bit DOS, small/compact model) with Open Watcom 1.9 against mTCP.
# Needs deps/ (tools/fetch_deps.sh). Output: build/A.EXE, build/B.EXE
# NOTE: do NOT use Open Watcom 2.0 beta: EXEs it builds print "End: heap is corrupted!".
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"; D="${DEPS:-$ROOT/deps}"; HERE="$ROOT/src"
export WATCOM="$D/ow19" PATH="$D/ow19/binl:$PATH" INCLUDE="$D/ow19/h"
MTCP_SRC="$(echo "$D"/mtcp-src/mTCP-src_*)"
OUT="$ROOT/build"; rm -rf "$OUT/mtcp" "$OUT/a" "$OUT/b"; mkdir -p "$OUT/mtcp"

# Lowercase mirror of the mTCP sources (Linux is case sensitive, mTCP is not).
for d in TCPINC TCPLIB INCLUDE; do
  l="$(echo $d | tr A-Z a-z)"; mkdir -p "$OUT/mtcp/$l"
  for f in "$MTCP_SRC/$d"/*; do
    sed -E 's/^(\s*#\s*include\s+["<])([^">]+)([">])/\1\L\2\3/' "$f" > "$OUT/mtcp/$l/$(basename "$f" | tr A-Z a-z)"
  done
done

LIBS="packet arp eth ip tcp tcpsockm udp utils dns timer trace"
for app in a b g; do
  B="$OUT/$app"; mkdir -p "$B"; cp "$HERE/$app.cfg" "$HERE/$app.cpp" "$HERE/mqtt.h" "$B/"
  FLAGS="-0 -mc -DCFG_H=\"$app.cfg\" -oh -os -s -zp2 -zpw -we -i=$OUT/mtcp/tcpinc -i=$OUT/mtcp/include -i=$B"
  ( cd "$B"
    for l in $LIBS; do wpp "$OUT/mtcp/tcplib/$l.cpp" $FLAGS -fo=$l.obj >/dev/null; done
    wasm -0 -mc "$OUT/mtcp/tcplib/ipasm.asm" -fo=ipasm.obj >/dev/null
    wpp $app.cpp $FLAGS -fo=$app.obj | grep -v "^Open Watcom\|^Version\|^Copyright\|^Portions\|^Source code\|^See https" || true
    wlink system dos option map option eliminate option stack=4096 name $app.exe \
      file $(for l in $LIBS ipasm $app; do printf "$l.obj,"; done | sed 's/,$//') >link.log 2>&1 || { cat link.log; exit 1; }
  )
  U="$(echo $app | tr a-z A-Z)"; cp "$B/$app.exe" "$OUT/$U.EXE"; ls -l "$OUT/$U.EXE"
done