#!/bin/bash
# Build wxWidgets with wxUniversal for WebAssembly
# This builds the GUI-enabled wxWidgets needed for KiCad
#
# Prerequisites:
# - Emscripten SDK installed and activated
# - autoconf (for regenerating configure from configure.in)
#
# To regenerate Makefile.in from bakefiles (after modifying files.bkl):
#   cd wxwidgets/build/bakefiles
#   docker run --rm -v "$(pwd)/../..":"$(pwd)/../.." -w "$(pwd)" \
#     ghcr.io/vslavik/bakefile:0.2 bakefile_gen
#
# Usage:
#   ./build-wxuniversal-wasm.sh              # Clean build (default)
#   ./build-wxuniversal-wasm.sh --no-clean   # Incremental build

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
BUILD_DIR="$PROJECT_ROOT/build-wasm/wxwidgets-universal"
WX_SOURCE="$PROJECT_ROOT/wxwidgets"

# Use JOBS from env.sh if set, otherwise default to 1 for sequential builds
JOBS="${JOBS:-1}"

echo "=== Building wxWidgets wxUniversal for WASM ==="
echo "Project root: $PROJECT_ROOT"
echo "Build dir: $BUILD_DIR"
echo "wxWidgets source: $WX_SOURCE"

# Verify we're in the right place
if [ ! -f "$WX_SOURCE/configure.in" ]; then
    echo "ERROR: wxWidgets source not found at $WX_SOURCE"
    echo "Make sure the wxwidgets submodule is initialized"
    exit 1
fi

# Regenerate configure if configure.in is newer
if [ "$WX_SOURCE/configure.in" -nt "$WX_SOURCE/configure" ]; then
    echo "configure.in is newer than configure, regenerating..."
    (cd "$WX_SOURCE" && autoconf)
fi

# Clean by default, unless --no-clean is passed
if [ "$1" != "--no-clean" ]; then
    echo "Cleaning build directory (use --no-clean to skip)..."
    rm -rf "$BUILD_DIR"
fi

# Create build directory
mkdir -p "$BUILD_DIR"
cd "$BUILD_DIR"

# Configure with emconfigure
# Key flags based on wxWidgets-wasm:
# --host=emscripten          Host system (detected via config.sub)
# --enable-universal         Use wxUniversal (draws widgets directly)
# --disable-shared           Build static libraries
# --with-opengl              Enable OpenGL/WebGL support
# --disable-exceptions       Emscripten doesn't support C++ exceptions well
# --disable-richtext         Not needed for KiCad, simplifies build
# --without-libtiff          Avoid external dependencies
# --disable-xlocale          Browser environment handles locale

echo ""
echo "=== Configuring ==="

# Set flags for Emscripten compatibility
# Z_HAVE_UNISTD_H ensures zlib includes <unistd.h> for read/write/lseek
# Include pcre2 headers from the build directory (generated during configure)
PCRE2_INCLUDE="$BUILD_DIR/3rdparty/pcre/src"

# Configure debug/release flags based on DEBUG_BUILD environment variable
if [ "${DEBUG_BUILD:-1}" = "1" ]; then
    WX_DEBUG_FLAGS="-g -O0"
    WX_CONFIGURE_DEBUG="--enable-debug"
    echo "Building wxWidgets in DEBUG mode"
else
    WX_DEBUG_FLAGS="-O2"
    WX_CONFIGURE_DEBUG=""
    echo "Building wxWidgets in RELEASE mode"
fi

export CFLAGS="-DZ_HAVE_UNISTD_H=1 ${WX_DEBUG_FLAGS}"
export CXXFLAGS="-DZ_HAVE_UNISTD_H=1 -I$PCRE2_INCLUDE ${WX_DEBUG_FLAGS}"

emconfigure "$WX_SOURCE/configure" \
    --host=emscripten \
    --without-subdirs \
    --enable-universal \
    --disable-shared \
    --with-opengl \
    --disable-exceptions \
    --disable-richtext \
    --without-libtiff \
    --disable-xlocale \
    --with-cxx=17 \
    --enable-utf8 \
    ${WX_CONFIGURE_DEBUG}

# Build PCRE first to avoid race condition with parallel builds
# PCRE headers (pcre2.h) must be generated before regex.cpp compiles
echo ""
echo "=== Building PCRE first (dependency) ==="
emmake make -C 3rdparty/pcre

# Build wxWidgets
echo ""
echo "=== Building wxWidgets (using ${JOBS} parallel jobs) ==="
emmake make -j${JOBS}

# Create library symlinks (remove -emscripten suffix for CMake compatibility)
echo ""
echo "=== Creating library symlinks ==="
cd "$BUILD_DIR/lib"
for lib in *-emscripten.a; do
    if [ -f "$lib" ]; then
        newname="${lib/-emscripten/}"
        ln -sf "$lib" "$newname"
    fi
done

# Create stub libraries for components wx-config reports but we didn't build
# KiCad doesn't use these directly
echo "Creating stub libraries..."
for stub in richtext webview; do
    emar rcs "libwx_wasmunivu_${stub}-3.2.a"
    ln -sf "libwx_wasmunivu_${stub}-3.2.a" "libwx_wasmunivu_${stub}-3.2-emscripten.a"
done

cd "$BUILD_DIR"

echo ""
echo "=== Build complete ==="
ls -lh "$BUILD_DIR"/lib/*.a 2>/dev/null || echo "Libraries built in $BUILD_DIR/lib"