#!/bin/sh
set -e
set -u

fn_usage() { (
    echo >&2 ""
    echo >&2 "USAGE"
    echo >&2 "        dashd-hd-service-install [datadir] ['testnet']"
    echo >&2 ""
    echo >&2 "EXAMPLE"
    echo >&2 "        dashd-hd-service-install /mnt/vol_slc1_100g/dashcore/"
    echo >&2 ""
    echo >&2 "NOTE"
    echo >&2 "        If a directory matching '/mnt/*/dashcore/' is found,"
    echo >&2 "        it will be used automatically."
    echo >&2 ""
); }

fn_datadir_help() { (
    my_vol="${1:-}"
    my_user="$(
        id -n -u
    )"
    my_group="$(
        id -n -g
    )"

    echo >&2 ""
    echo >&2 "ERROR"
    echo >&2 "        '${my_vol}' is not writable"
    echo >&2 ""
    echo >&2 "SOLUTION"
    echo >&2 "        1. Mount a large (50gb+) volume"
    echo >&2 ""
    echo >&2 "              sudo mkdir -p /mnt/EXAMPLE"
    echo >&2 "              sudo mount /dev/sdx1 /mnt/EXAMPLE"
    echo >&2 ""
    echo >&2 "        2. Create a 'dashcore' inside of it"
    echo >&2 ""
    echo >&2 "              sudo mkdir -p '${my_vol}'"
    echo >&2 ""
    echo >&2 "        3. Make it writable to this user"
    echo >&2 ""
    echo >&2 "              sudo chown -R '${my_user}':'${my_group}' '${my_vol}'"
    echo >&2 ""
    echo >&2 ""
); }

fn_srv_install() { (
    my_vol="${1:-}"
    my_netname="${2:-}"

    my_name='dashd'

    # both of these will get '/testnet3' suffixes with -testnet
    my_datadir="${my_vol}/_data"
    my_blocksdir="${my_vol}/_caches"

    if test -n "${my_netname}"; then
        if test "mainnet" = "${my_netname}"; then
            my_netname=""
        elif test "testnet" != "${my_netname}"; then
            fn_usage
            return 1
        fi
    fi

    if ! test -d "${my_datadir}"; then
        mkdir "${my_datadir}"
        chmod 0700 "${my_datadir}"
    fi
    if ! test -d "${my_blocksdir}"; then
        mkdir -p "${my_blocksdir}"
        chmod 0700 "${my_blocksdir}"
    fi

    my_net_flag=''
    if test -n "${my_netname}"; then
        # ex: -testnet
        my_net_flag="-${my_netname}"

        # ex: dashd-testnet
        my_name="dashd-${my_netname}"
    fi

    my_system_args=""
    my_kernel="$(
        uname -s
    )"
    if test "Darwin" != "${my_kernel}"; then
        my_user="$(
            id -u -n
        )"
        my_system_args="--system --username ${my_user}"
    fi

    # shellcheck disable=SC2016,SC1090
    echo 'sudo env PATH="$PATH"' \
        "serviceman add ${my_system_args} --path \"\$PATH\" --name \"${my_name}\" --force --" \
        "dashd " \
        "${my_net_flag}" \
        -usehd \
        '-conf="$HOME/.dashcore/dash.conf"' \
        '-settings="$HOME/.dashcore/settings.json"' \
        '-walletdir="$HOME/.dashcore/wallets/"' \
        "-datadir=\"${my_datadir}\"" \
        "-blocksdir=\"${my_blocksdir}\""

    if ! command -v serviceman > /dev/null; then
        echo ""
        echo "Installing 'serviceman'..."
        echo ""
        {
            curl -fsSL "${WEBI_HOST}/serviceman" | sh
        } > /dev/null

        # shellcheck disable=SC1090
        . ~/.config/envman/PATH.env || true
    fi

    mkdir -p "$HOME/.dashcore/wallets/"
    chmod 0700 "$HOME/.dashcore/wallets/"

    mkdir -p "${my_datadir}"
    chmod 0700 "${my_datadir}"

    mkdir -p "${my_blocksdir}"
    chmod 0700 "${my_blocksdir}"

    cd "${my_vol}" || return 1
    # leave options unquoted so they're interpreted separately
    # shellcheck disable=SC2086
    sudo env PATH="${PATH}" \
        serviceman add ${my_system_args} --path "${PATH}" --name "${my_name}" --force -- \
        dashd \
        ${my_net_flag} \
        -usehd \
        -conf="${HOME}/.dashcore/dash.conf" \
        -settings="${HOME}/.dashcore/settings.json" \
        -walletdir="${HOME}/.dashcore/wallets/" \
        -datadir="${my_datadir}" \
        -blocksdir="${my_blocksdir}"

); }

main() { (
    my_vol="${1:-}"
    my_netname="${2:-}"

    if test -z "${my_vol}"; then
        my_vol="$(
            ls -d /mnt/*/dashcore/ 2> /dev/null || true
        )"
    fi

    if test "help" = "${my_vol}" ||
        test "--help" = "${my_vol}"; then
        fn_usage
        return 0
    fi

    if test -z "${my_vol}"; then
        fn_usage
        return 1
    fi

    if ! test -d "${my_vol}" ||
        ! test -w "${my_vol}"; then
        fn_datadir_help "${my_vol}"
        return 1
    fi

    fn_srv_install "${my_vol}" "${my_netname}"
); }

main "${@:-}"