#!/bin/bash

# vars
SELF="${BASH_SOURCE[0]}"
SELF_DIR=$(cd $(dirname "${BASH_SOURCE[0]}") && pwd -P)
SELF_DIR="${SELF_DIR:-$(pwd)}"
TOOLS_DIR="${SELF_DIR}/tools"
BUILD_DIR="${TOOLS_DIR}/local/build"
INSTALL_DIR="${TOOLS_DIR}/local"
TOOLS=('discount' 'zlib' 'libpng' 'pngquant' 'zopfli')

# discount
function build_discount {
    ./configure.sh --prefix="${INSTALL_DIR}" || return 1
    make || return 1
    make install || return 1
}

# zlib
function build_zlib {
    ./configure --static --prefix="${INSTALL_DIR}" || return 1
    make || return 1
    make install || return 1
    rm -f "${INSTALL_DIR}/lib/libz*.dylib"
}

# libpng
function build_libpng {
    rm -rf Makefile.in aclocal.m4 automate.cache/ compile config.guess config.h.in config.sub configure depcomp install-sh ltmain.sh missing scripts/libtool.m4 scripts/ltoptions.m4 scripts/ltsugar.m4 scripts/ltversion.m4 scripts/lt~obsolete.m4 test-driver || return 1
    ./autogen.sh || return 1
    CFLAGS="-I${INSTALL_DIR}/include" CPPFLAGS="-I${INSTALL_DIR}/include" LDFLAGS="-L${INSTALL_DIR}/lib -lz" ./configure --with-zlib-prefix="${INSTALL_DIR}" --prefix="${INSTALL_DIR}" --disable-shared --enable-static || return 1
    make || return 1
    make install || return 1
}

# pngquant
function build_pngquant {
    ./configure --extra-cflags="-I${INSTALL_DIR}/include" --extra-ldflags="-L${INSTALL_DIR}/lib -lz" --prefix="${INSTALL_DIR}" --with-libpng="${INSTALL_DIR}" --without-cocoa || return 1
    sed -i.sedbak -e 's:-L/usr/lib -lz::g' config.mk || return 1
    rm -f config.mk.sedbak
    make || return 1
    make install || return 1
}

# zopfli
function build_zopfli {
    make zopfli zopflipng || return 1
    cp zopfli zopflipng "${INSTALL_DIR}/bin" || return 1
}

# main
rm -rf "${INSTALL_DIR}"
rm -rf "${BUILD_DIR}"
mkdir -p "${BUILD_DIR}"
cd "${BUILD_DIR}"
ERROR=false
echo "Building:"
for TOOL in "${TOOLS[@]}"; do
    echo "  ${TOOL}"
    cp -R "${TOOLS_DIR}/${TOOL}" "${BUILD_DIR}/"
    rm -rf "${BUILD_DIR}/${TOOL}/.git"
    cd "${BUILD_DIR}/${TOOL}"
    if ! build_${TOOL} >/dev/null 2>&1; then
        ERROR=true
        echo "Unable to build tool: ${TOOL}" >&2
        break
    fi
done
rm -rf "${BUILD_DIR}"

# done
if [[ "${ERROR}" == true ]]; then
    exit 1
fi
echo "Complete."
exit 0