LND_VERSION_DIR_AARCH64=lnd-linux-arm64-v0.15.2-beta
LND_URL_AARCH64=https://github.com/lightningnetwork/lnd/releases/download/v0.15.2-beta/lnd-linux-arm64-v0.15.2-beta.tar.gz
LND_SHA256_AARCH64=e35e81dca504a88d87552d26a06a58ea8515faf629e187e5e5a3dde4cc463cca

LND_HOME=/home/lnd

lnd_bin_install() {
    cd $LND_HOME
    local lnd_targz=$LND_VERSION_DIR_AARCH64.tar.gz
    test -f $LND_VERSION_DIR_AARCH64/lnd && return 0;
    curl -sSL -o $lnd_targz "$LND_URL_AARCH64"
    if [ $? -ne 0 ]; then
        printf "ERROR: unable to download $LND_URL_AARCH64\n" 1>&2
        return 1
    fi
    printf "$LND_SHA256_AARCH64 $lnd_targz" | sha256sum --check
    [ $? -ne 0 ] && return 1
    tar -C $LND_HOME --no-same-owner -xf $lnd_targz
    rm -f $lnd_targz
    return $?
}

lnd_svc_install() {
    mkdir -p /etc/sv/lnd
    cat <<EOF > /etc/sv/lnd/run.new
#!/bin/sh
[ -r conf ] && . ./conf
sv start bitcoind || exit 1
exec chpst -u lnd $LND_HOME/$LND_VERSION_DIR_AARCH64/lnd -C /home/lnd/lnd.mainnet.conf 2>&1
EOF
    chmod +x /etc/sv/lnd/run.new
    test -f /etc/sv/lnd/run && diff /etc/sv/lnd/run /etc/sv/lnd/run.new
    if [ $? -ne 0 ]; then
        sv -w 600 stop lnd || printf "ERROR: sv stop lnd failed\n" 1>&2
        mv /etc/sv/lnd/run.new /etc/sv/lnd/run
        sv start lnd || printf "ERROR: sv start lnd failed\n" 1>&2
    fi
    rm -f /etc/sv/lnd/run.new
    # whatever happened above, try to ensure the service is up
    chmod +x /etc/sv/lnd/run
    [ ! -f /etc/sv/lnd/down ] && sv start lnd
}

lnd_cli_install() {
    mkdir -p /opt/bin
    cat <<EOF > /opt/bin/lncli.sh
#!/bin/sh
set -e
cli=$LND_HOME/$LND_VERSION_DIR_AARCH64/lncli
exec doas -u lnd \$cli --macaroonpath /ssd/lnd/data/chain/bitcoin/mainnet/admin.macaroon "\$@"
EOF
    chmod +x /opt/bin/lncli.sh
}

lnd_apply() {
    lnd_bin_install || return 1
    lnd_svc_install || return 1
    lnd_cli_install || return 1
}