#!/usr/bin/env bash
# Configures and builds vpinball itself for the new GL-emscripten CMake
# target, producing dist/vpinball.{js,wasm}.
#
# Requires: scripts/setup.sh and scripts/build-deps.sh have already run.
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
source "$ROOT_DIR/scripts/versions.sh"

VPINBALL_DIR="$ROOT_DIR/vendor/vpinball"
DEPS_DIR="$ROOT_DIR/build/deps-wasm32"
BUILD_DIR="$ROOT_DIR/build/vpinball-wasm"
DIST_DIR="$ROOT_DIR/dist"

BUILD_TYPE="Release"
if [ "${1:-}" = "--debug" ]; then
   BUILD_TYPE="Debug"
fi

if [ ! -d "$VPINBALL_DIR" ]; then
   echo "ERROR: vendor/vpinball missing. Run scripts/setup.sh first." >&2
   exit 1
fi
if [ ! -d "$DEPS_DIR/lib" ] || [ -z "$(ls -A "$DEPS_DIR/lib" 2>/dev/null)" ]; then
   echo "ERROR: build/deps-wasm32 missing/empty. Run scripts/build-deps.sh first." >&2
   exit 1
fi
if ! command -v emcc >/dev/null 2>&1; then
   echo "ERROR: emcc not on PATH. Run: source $ROOT_DIR/emsdk/emsdk_env.sh" >&2
   exit 1
fi

NUM_PROCS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)"

EMSCRIPTEN_LINK_FLAGS=(
   -sUSE_WEBGL2=1
   -sFULL_ES3=1
   -sMIN_WEBGL_VERSION=2
   -sMAX_WEBGL_VERSION=2
   -sALLOW_MEMORY_GROWTH=1
   -sMODULARIZE=1
   -sEXPORT_ES6=1
   -sEXPORT_NAME=VPinballModule
   -sENVIRONMENT=web
   -sEXPORTED_RUNTIME_METHODS=FS,ccall,cwrap
   -sFORCE_FILESYSTEM=1
   -sEXPORTED_FUNCTIONS=_main,_vpinball_wasm_start,_vpinball_wasm_stop,_vpinball_wasm_dispose
   -sEXIT_RUNTIME=0
   --use-preload-cache
)
if [ "$BUILD_TYPE" = "Debug" ]; then
   EMSCRIPTEN_LINK_FLAGS+=(-sASSERTIONS=1 -O0)
else
   # CMAKE_BUILD_TYPE=Release only optimizes the compile step; emcc's link
   # step needs its own -O level to actually run wasm-opt/dead-code
   # elimination. NOTE: --closure 1 was tried here but strips FS.writeFile/
   # readFile/mkdir (the FS convenience wrappers EXPORTED_RUNTIME_METHODS=FS
   # is supposed to guarantee) down to just low-level node ops - dropped
   # until that's root-caused, since a smaller JS glue isn't worth a broken
   # runtime table-loading API.
   EMSCRIPTEN_LINK_FLAGS+=(-O2)
fi

emcmake cmake \
   -S "$VPINBALL_DIR" \
   -B "$BUILD_DIR" \
   -DRENDERER=GL \
   -DPLATFORM=emscripten \
   -DARCH=wasm32 \
   -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
   -DVPINBALL_WASM_DEPS_DIR="$DEPS_DIR" \
   -DCMAKE_EXE_LINKER_FLAGS="${EMSCRIPTEN_LINK_FLAGS[*]}"

cmake --build "$BUILD_DIR" -- -j"$NUM_PROCS"

mkdir -p "$DIST_DIR"
cp "$BUILD_DIR"/vpinball.js "$DIST_DIR/" 2>/dev/null || true
cp "$BUILD_DIR"/vpinball.wasm "$DIST_DIR/" 2>/dev/null || true
cp "$BUILD_DIR"/vpinball.data "$DIST_DIR/" 2>/dev/null || true

mkdir -p "$ROOT_DIR/package/assets"
cp "$VPINBALL_DIR/tests/assets/test000-default-table.vpx" "$ROOT_DIR/package/assets/default.vpx" 2>/dev/null || true

echo ""
echo "== build.sh complete =="
ls -la "$DIST_DIR"