#!/usr/bin/env bash

#
# Downloads openjdk from AdoptOpenJDK by accessing the API.
# The API is documented at https://api.adoptopenjdk.net/swagger-ui/
#

source $(dirname $0)/inc/logger.inc

set -e

case "$(uname)" in
    Linux*)
        JDK_OS=linux
        COMPONENTS_TO_STRIP=1 # e.g. openjdk-11.0.3+7/bin/java
        ;;
    Darwin*)
        JDK_OS=mac
        COMPONENTS_TO_STRIP=3 # e.g. jdk-11.0.3+7/Contents/Home/bin/java
    ;;
    CYGWIN*|MINGW*)
        JDK_OS=windows
    ;;
    *)
        log_error "Unknown OS: $(uname)"
        exit 1
    ;;
esac


OPENJDK_VERSION=$1
DOWNLOAD_URL=$(curl --silent -X GET "https://api.adoptopenjdk.net/v3/assets/feature_releases/${OPENJDK_VERSION}/ga?architecture=x64&heap_size=normal&image_type=jdk&jvm_impl=hotspot&os=${JDK_OS}&page=0&page_size=1&project=jdk&sort_method=DEFAULT&sort_order=DESC&vendor=adoptopenjdk" \
    -H "accept: application/json" \
    | jq -r ".[0].binaries[0].package.link")

OPENJDK_ARCHIVE=$(basename ${DOWNLOAD_URL})
log_debug "Archive name: ${OPENJDK_ARCHIVE}"

CACHE_DIR=${HOME}/.cache/openjdk
TARGET_DIR=${HOME}/openjdk${OPENJDK_VERSION}

mkdir -p ${CACHE_DIR}
mkdir -p ${TARGET_DIR}

if [ ! -e ${CACHE_DIR}/${OPENJDK_ARCHIVE} ]; then
    log_info "Downloading from ${DOWNLOAD_URL} to ${CACHE_DIR}"
    curl --location --output ${CACHE_DIR}/${OPENJDK_ARCHIVE} "${DOWNLOAD_URL}"
else
    log_info "Skipped download, file ${CACHE_DIR}/${OPENJDK_ARCHIVE} already exists"
fi

log_info "Extracting to ${TARGET_DIR}"

case "$OPENJDK_ARCHIVE" in
    *.zip)
        7z x ${CACHE_DIR}/${OPENJDK_ARCHIVE} -o${TARGET_DIR}
        mv ${TARGET_DIR}/*/* ${TARGET_DIR}/
        ;;
    *.tar.gz)
        tar --extract --file ${CACHE_DIR}/${OPENJDK_ARCHIVE} -C ${TARGET_DIR} --strip-components=${COMPONENTS_TO_STRIP}
        ;;
    *)
        log_error "Unknown filetype: ${OPENJDK_ARCHIVE}"
        exit 1
        ;;
esac

if [ ! -e ${HOME}/java.env ]; then
    cat > ${HOME}/java.env <<EOF
export JAVA_HOME="${TARGET_DIR}"
export PATH="${TARGET_DIR}/bin:${PATH}"
EOF

    log_info "OpenJDK can be used via ${HOME}/java.env"
    cat ${HOME}/java.env
    source ${HOME}/java.env
    java -version

else
    log_info "${HOME}/java.env already existed and has not been changed"
    log_info "OpenJDK${OPENJDK_VERSION} can be used from ${TARGET_DIR}"
fi