#!/usr/bin/env bash
# Build the WebAssembly target (openra3.html/.js/.wasm) with the Emscripten image.
#
# Browsers forbid synchronous on-demand file reads on the main thread, so assets
# are preloaded into the module's filesystem. Prefer a compact, per-map set: one
# map plus the tiles it uses:
#
#   OPENRA3_WEB_ASSETS="$(mktemp -d)" \
#     openra3 textures --map map_mp_2_feasel1   # copy these under the set's terrain/
#
# then point OPENRA3_WEB_ASSETS at that directory.
set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"
IMAGE="${OPENRA3_WASM_IMAGE:-openra3-wasm:local}"
BUILD_DIR="${1:-build/wasm}"

docker build --target dev -f "$ROOT/Dockerfile.wasm" -t "$IMAGE" "$ROOT"

mounts=(-v "$ROOT:/work")
configure=(-DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/emscripten-wasm.cmake -DCMAKE_BUILD_TYPE=Release)
if [ -n "${OPENRA3_WEB_ASSETS:-}" ]; then
    mounts+=(-v "$OPENRA3_WEB_ASSETS:/assets:ro")
    configure+=(-DOPENRA3_WEB_ASSETS=/assets)
fi

docker run --rm "${mounts[@]}" -w /work "$IMAGE" cmake -S . -B "$BUILD_DIR" -G Ninja "${configure[@]}"
docker run --rm "${mounts[@]}" -w /work "$IMAGE" cmake --build "$BUILD_DIR" -j

echo "WebAssembly: $ROOT/$BUILD_DIR/bin/openra3.html (+ .js/.wasm/.data)"
echo "serve:  python3 \"$ROOT/apps/web/serve.py\" --root \"$ROOT/$BUILD_DIR/bin\" --port 8199"