#!/bin/bash
# Script to build a minimal CentOS 3.9 Docker image for PFEXTLIB compilation
# This creates a container with libstdc++.5 and necessary build tools

set -e

CENTOS_VAULT="https://archive.kernel.org/centos-vault/3.9/os/i386"
WORK_DIR="$(pwd)/centos39-rootfs"
IMAGE_NAME="centos39-pfextlib:latest"

echo "==> Creating minimal CentOS 3.9 rootfs for Docker..."

# Clean previous build
rm -rf "$WORK_DIR"
mkdir -p "$WORK_DIR"

# Create basic directory structure
mkdir -p "$WORK_DIR"/{dev,proc,sys,tmp,var/lib/rpm,etc,bin,sbin,usr/{bin,sbin,lib,local},lib}

echo "==> Downloading essential RPMs from CentOS 3.9 vault..."

# Essential RPMs needed for a minimal system with build tools
# All filenames verified against https://archive.kernel.org/centos-vault/3.9/os/i386/RedHat/RPMS/
RPMS=(
    # Core system
    "basesystem-8.0-2.centos.0.noarch.rpm"
    "filesystem-2.2.1-3.centos.1.i386.rpm"
    "setup-2.5.27-1.noarch.rpm"
    "glibc-2.3.2-95.50.i386.rpm"
    "glibc-common-2.3.2-95.50.i386.rpm"
    "glibc-devel-2.3.2-95.50.i386.rpm"
    "glibc-headers-2.3.2-95.50.i386.rpm"
    "glibc-kernheaders-2.4-8.34.5.i386.rpm"
    "bash-2.05b-41.7.centos.0.i386.rpm"
    "coreutils-4.5.3-28.7.i386.rpm"
    "grep-2.5.1-24.6.i386.rpm"
    "sed-4.0.7-9.el3.i386.rpm"
    "gawk-3.1.1-9.i386.rpm"
    "findutils-4.1.7-9.1.i386.rpm"
    "util-linux-2.11y-31.23.i386.rpm"
    
    # libstdc++.5 - THE KEY LIBRARY FOR LEGACY SUPPORT
    "compat-libstdc++-7.3-2.96.128.i386.rpm"
    "libstdc++-3.2.3-59.i386.rpm"
    "libstdc++-devel-3.2.3-59.i386.rpm"
    
    # Build tools (GCC toolchain)
    "gcc-3.2.3-59.i386.rpm"
    "gcc-c++-3.2.3-59.i386.rpm"
    "cpp-3.2.3-59.i386.rpm"
    "libgcc-3.2.3-59.i386.rpm"
    "make-3.79.1-17.1.i386.rpm"
    "binutils-2.14.90.0.4-42.i386.rpm"
    "libtool-1.4.3-6.i386.rpm"
    "libtool-libs-1.4.3-6.i386.rpm"
    "autoconf-2.57-3.noarch.rpm"
    "automake-1.6.3-5.noarch.rpm"
    "m4-1.4.1-13.i386.rpm"
    
    # Additional libraries and tools
    "zlib-1.1.4-10.EL3.i386.rpm"
    "zlib-devel-1.1.4-10.EL3.i386.rpm"
    "libacl-2.2.3-1.i386.rpm"
    "libattr-2.2.0-1.i386.rpm"
    "pcre-3.9-10.2.i386.rpm"
    "file-3.39-9.EL3.4.i386.rpm"
    "perl-5.8.0-94.EL3.i386.rpm"
    "ncurses-5.3-9.4.i386.rpm"
    "ncurses-devel-5.3-9.4.i386.rpm"
    "libtermcap-2.0.8-35.i386.rpm"
    "readline-4.3-5.2.i386.rpm"
    "readline-devel-4.3-5.2.i386.rpm"
    "tar-1.13.25-15.RHEL3.i386.rpm"
    "gzip-1.3.3-14.rhel3.i386.rpm"
    "bzip2-1.0.2-11.EL3.4.i386.rpm"
    "bzip2-libs-1.0.2-11.EL3.4.i386.rpm"
    "patch-2.5.4-16.i386.rpm"
    "diffutils-2.8.1-8.i386.rpm"
    "which-2.14-7.i386.rpm"
    "sed-4.0.7-9.el3.i386.rpm"
    "info-4.5-3.el3.1.i386.rpm"
    "texinfo-4.5-3.el3.1.i386.rpm"
)

# Download RPMs
mkdir -p rpms
cd rpms

for rpm in "${RPMS[@]}"; do
    if [ ! -f "$rpm" ]; then
        echo "Downloading $rpm..."
        wget -q "${CENTOS_VAULT}/RedHat/RPMS/${rpm}" || {
            echo "Warning: Failed to download $rpm, continuing..."
        }
    fi
done

cd ..

echo "==> Extracting RPMs to rootfs..."

# Extract all RPMs
for rpm in rpms/*.rpm; do
    if [ -f "$rpm" ]; then
        echo "Extracting $(basename $rpm)..."
        cd "$WORK_DIR"
        rpm2cpio "../$rpm" | cpio -idm 2>/dev/null || true
        cd ..
    fi
done

echo "==> Configuring minimal system..."

# Create essential device nodes
sudo mknod -m 666 "$WORK_DIR/dev/null" c 1 3 || true
sudo mknod -m 666 "$WORK_DIR/dev/zero" c 1 5 || true
sudo mknod -m 666 "$WORK_DIR/dev/random" c 1 8 || true
sudo mknod -m 666 "$WORK_DIR/dev/urandom" c 1 9 || true

# Create minimal /etc/passwd and /etc/group
cat > "$WORK_DIR/etc/passwd" <<EOF
root:x:0:0:root:/root:/bin/bash
builder:x:1000:1000:Builder:/home/builder:/bin/bash
EOF

cat > "$WORK_DIR/etc/group" <<EOF
root:x:0:
builder:x:1000:
EOF

# Create minimal /etc/resolv.conf
cat > "$WORK_DIR/etc/resolv.conf" <<EOF
nameserver 8.8.8.8
nameserver 8.8.4.4
EOF

# Create working directories
mkdir -p "$WORK_DIR"/{root,home/builder,usr/local/PFEXTLIB-1.2}
chmod 755 "$WORK_DIR/tmp"

echo "==> Copying PFEXTLIB source code..."
cp -r usr/local/PFEXTLIB-1.2/* "$WORK_DIR/usr/local/PFEXTLIB-1.2/"

echo "==> Cleaning pre-existing build artifacts..."
cd "$WORK_DIR/usr/local/PFEXTLIB-1.2"
for dir in cppunit-1.10.2 fftw-3.0.1 hdf5-1.6.2; do
    if [ -d "$dir" ]; then
        cd "$dir"
        make distclean 2>/dev/null || true
        find . -name "*.o" -delete 2>/dev/null || true
        find . -name "*.so*" -delete 2>/dev/null || true
        find . -name "*.a" -delete 2>/dev/null || true
        find . -name ".libs" -type d -exec rm -rf {} + 2>/dev/null || true
        cd ..
    fi
done
cd -

echo "==> Creating build scripts in container..."

# Create compilation script for cppunit
cat > "$WORK_DIR/usr/local/PFEXTLIB-1.2/build-cppunit.sh" <<'EOF'
#!/bin/bash
set -e
cd /usr/local/PFEXTLIB-1.2/cppunit-1.10.2
echo "==> Cleaning cppunit build..."
make distclean 2>/dev/null || true
echo "==> Configuring cppunit..."
./configure --prefix=/usr/local/PFEXTLIB-1.2/cppunit
echo "==> Building cppunit..."
make -j$(nproc 2>/dev/null || echo 2)
echo "==> Installing cppunit..."
make install
echo "==> cppunit build complete!"
EOF

# Create compilation script for fftw
cat > "$WORK_DIR/usr/local/PFEXTLIB-1.2/build-fftw.sh" <<'EOF'
#!/bin/bash
set -e
cd /usr/local/PFEXTLIB-1.2/fftw-3.0.1
echo "==> Cleaning fftw build..."
make distclean 2>/dev/null || true
echo "==> Configuring fftw..."
./configure --prefix=/usr/local/PFEXTLIB-1.2/fftw --enable-shared --enable-threads
echo "==> Building fftw..."
make -j$(nproc 2>/dev/null || echo 2)
echo "==> Installing fftw..."
make install
echo "==> fftw build complete!"
EOF

# Create compilation script for hdf5
cat > "$WORK_DIR/usr/local/PFEXTLIB-1.2/build-hdf5.sh" <<'EOF'
#!/bin/bash
set -e
cd /usr/local/PFEXTLIB-1.2/hdf5-1.6.2
echo "==> Cleaning hdf5 build..."
make distclean 2>/dev/null || true
echo "==> Configuring hdf5..."
./configure --prefix=/usr/local/PFEXTLIB-1.2/hdf5 --enable-cxx
echo "==> Building hdf5..."
make -j$(nproc 2>/dev/null || echo 2)
echo "==> Installing hdf5..."
make install
echo "==> hdf5 build complete!"
EOF

# Create compilation script for xerces-c
cat > "$WORK_DIR/usr/local/PFEXTLIB-1.2/build-xerces.sh" <<'EOF'
#!/bin/bash
set -e
cd /usr/local/PFEXTLIB-1.2/xerces-c-src2_1_0/src
echo "==> Cleaning xerces-c build..."
make clean 2>/dev/null || true
rm -rf ../lib/*.so* ../lib/*.a 2>/dev/null || true
rm -rf ../bin/* 2>/dev/null || true
echo "==> Building xerces-c..."
export XERCESCROOT=/usr/local/PFEXTLIB-1.2/xerces-c-src2_1_0
./runConfigure -plinux -cgcc -xg++ -minmem -nsocket -tnative -rpthread
make -j$(nproc 2>/dev/null || echo 2)
echo "==> xerces-c build complete!"
echo "Library location: $XERCESCROOT/lib/"
EOF

# Create master build script
cat > "$WORK_DIR/usr/local/PFEXTLIB-1.2/build-all.sh" <<'EOF'
#!/bin/bash
set -e

echo "======================================"
echo "PFEXTLIB Build System"
echo "CentOS 3.9 with libstdc++.5"
echo "======================================"
echo

# Display compiler information
echo "==> Compiler information:"
gcc --version | head -1
g++ --version | head -1
echo

# Check for libstdc++
echo "==> Checking for libstdc++.5:"
ldconfig -p | grep libstdc++ || true
echo

# Build each library
echo "==> Building all PFEXTLIB libraries..."
echo

bash /usr/local/PFEXTLIB-1.2/build-cppunit.sh
echo
bash /usr/local/PFEXTLIB-1.2/build-fftw.sh
echo
bash /usr/local/PFEXTLIB-1.2/build-hdf5.sh
echo
bash /usr/local/PFEXTLIB-1.2/build-xerces.sh
echo

echo "======================================"
echo "Build complete!"
echo "======================================"
echo "Libraries installed in:"
echo "  - /usr/local/PFEXTLIB-1.2/cppunit"
echo "  - /usr/local/PFEXTLIB-1.2/fftw"
echo "  - /usr/local/PFEXTLIB-1.2/hdf5"
echo "  - /usr/local/PFEXTLIB-1.2/xerces-c-src2_1_0/lib"
echo "  - /usr/local/PFEXTLIB-1.2/fftw"
echo "  - /usr/local/PFEXTLIB-1.2/hdf5"
EOF

chmod +x "$WORK_DIR/usr/local/PFEXTLIB-1.2"/*.sh

echo "==> Creating Docker image from rootfs..."

# Create Dockerfile for the actual image
cat > "$WORK_DIR/Dockerfile" <<EOF
FROM scratch
ADD . /
ENV PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
ENV LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/lib
ENV PREFIX=/usr/local/PFEXTLIB-1.2
WORKDIR /usr/local/PFEXTLIB-1.2
CMD ["/bin/bash"]
EOF

# Build the Docker image
cd "$WORK_DIR"
sudo docker build -t "$IMAGE_NAME" .
cd ..

echo
echo "======================================"
echo "Docker image created: $IMAGE_NAME"
echo "======================================"
echo
echo "To use the image:"
echo "  docker run -it $IMAGE_NAME /bin/bash"
echo
echo "To build all libraries inside container:"
echo "  docker run -it $IMAGE_NAME /usr/local/PFEXTLIB-1.2/build-all.sh"
echo
echo "To extract compiled libraries:"
echo "  docker run -v \$(pwd)/output:/output $IMAGE_NAME bash -c 'cp -r /usr/local/PFEXTLIB-1.2/{cppunit,fftw,hdf5} /output/'"
echo