#!/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="${TOOLS_DIR}/local"
SYS_NAME=$(uname | awk '{ print tolower($0)}')
TOOLS=('discount')
TOOLS_EXTRA=('zlib' 'libpng' 'pngquant' 'zopfli')

# args
OPTIND=1
OPTSPEC=":-:"
OPTARRAY=('--all')  # all short and long options
while getopts "${OPTSPEC}" OPT; do
    case "${OPT}" in
        -)
            case "${OPTARG}" in
                all)
                    TOOLS=("${TOOLS[@]}" "${TOOLS_EXTRA[@]}")
                    ;;
                all=*)
                    # Option with prohibited value
                    echo "option --${OPTARG%%=*} takes no value" >&2
                    exit 1
                    ;;
                *)
                    if [[ "${OPTERR}" == 1 ]]; then
                        # Invalid option specified
                        echo "invalid option: --${OPTARG}" >&2
                        exit 1
                    fi
                    ;;
            esac
            ;;
        :)
            # Option without required value
            echo "option -${OPTARG} requires a value" >&2
            exit 1
            ;;
        \?)
            # Invalid option specified
            echo "invalid option: -${OPTARG}" >&2
            exit 1
            ;;
    esac
done
shift $((OPTIND - 1))

# 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 {
    if [[ "${SYS_NAME}" == "darwin" ]]; then
        cp scripts/makefile.darwin Makefile
    elif [[ "${SYS_NAME}" == "linux" ]]; then
        cp scripts/makefile.linux Makefile
    else
        return 1
    fi
    make libpng.a prefix="${INSTALL_DIR}" ZLIBINC="${INSTALL_DIR}/include" ZLIBLIB="${INSTALL_DIR}/lib" || return 1
    make install-static prefix="${INSTALL_DIR}" || 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

# clean up
if [[ "${ERROR}" != true ]]; then
    rm -rf "${BUILD_DIR}"
fi

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