#!/usr/bin/env sh

# exit on error 
set -e

# variables
unbound_dir="/tmp/unbound"
src_dir="$unbound_dir/src"

# functions
function checkEnvironment() {
    [[ -n "$VERSION" ]] && return
    printf "environment variable 'VERSION' is unset, defaulting to 'latest'...\n"
    VERSION="latest"
}

function checkAndExtractArchive() {
        cd "$src_dir"
        archive="$(find "$src_dir" -type f -iname 'unbound*.tar.gz' -exec basename {} \;)"
        [[ -n "$archive" ]] && tar -xzf "$archive" && rm -f "$archive" && return 
        archive="$(find "$src_dir" -type f -iname 'unbound*.zip' -exec basename {} \;)"
        [[ -z "$archive" ]] && return
        unzip -q "$archive" -d "$(basename -s ".zip" $archive)" && rm -f "$archive"
}

function getPkgVersion() {
    pkgver="$(find "$src_dir" -type d -iname 'unbound*' -exec sh -c "realpath {} | cut -d "-" -f2" \;)"
}

function downloadSources() {
    mkdir -p "$src_dir"
    cd "$src_dir"
    wget "https://nlnetlabs.nl/downloads/unbound/unbound-$VERSION.tar.gz"
    tar -xzf "unbound-$VERSION.tar.gz"
    rm -f "unbound-$VERSION.tar.gz"
}

# main routine
printf "starting build process for unbound with redis support...\n"

# check if an archive is in "$src_dir" present and extract it
checkAndExtractArchive

# check if a valid version has been copied to "$src_dir"
getPkgVersion

# if no valid version could be found, start a download
if [[ -z "$pkgver" ]]; then
    checkEnvironment
    downloadSources
    getPkgVersion
fi

# exit if no unbound version could be determined
[[ -z "$pkgver" ]] && printf "error: could not determine unbound version\n" && exit 1

# replace version in APKBUILD file
sed -i "s/pkgver=0.0.0/pkgver=$pkgver/" "$unbound_dir/APKBUILD"

# generate key pairs
printf "\n" | abuild-keygen -a

# generate checksums and start the build
cd "$unbound_dir"
abuild -F checksum 
abuild -F -r 

# move the built packages 
[[ ! -d "/build" ]] && mkdir -p "/build"
rm -rf "/build/"*
find $HOME/packages -type f -iname '*.apk' -exec mv {} /build \;

# clean up
rm -rf "$unbound_dir"

printf ".apk files can be found at '/build'\n"
cd "/build"
ls -1