#!/bin/bash
# I, Ian Kelling, follow the GNU license recommendations at
# https://www.gnu.org/licenses/license-recommendations.en.html. They
# recommend that small programs, < 300 lines, be licensed under the
# Apache License 2.0. This file contains or is part of one or more small
# programs. If a small program grows beyond 300 lines, I plan to switch
# its license to GPL.

# Copyright 2024 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

## bitcoin disabled. fees too high

if [[ $HOSTNAME == frodo ]]; then
        case $distro in
            debian)
                if [[ `debian-archive`  == testing ]]; then
                    # has no unstable dependencies
                    pi bitcoind/unstable
                    src=/a/opt/bitcoin/contrib/init/bitcoind.service
                    s cp $src /etc/systemd/system
                    p=/etc/bitcoin/bitcoin
                    dst=/etc/systemd/system/bitcoinjm.service
                    # jm for joinmarket
                    $sed -r "/^\s*ExecStart/s,${p}.conf,${p}jm.conf," $src \
                             >/etc/systemd/system/bitcoinjm.service

                    d=jm; jm=d # being clever for succinctness
                    for s in d jm; do
                        s $sed -ri "/^\s*\[Unit\]/a Conflicts=bitcoin${!s}.service" \
                              /etc/systemd/system/bitcoin${s}.service
                    done

                    ser daemon-reload

                    dir=/nocow/.bitcoin
                    s mkdir -p $dir
                    s chown -R bitcoin:bitcoin $dir
                    dir=/etc/bitcoin
                    s mkdir -p $dir
                    s chown -R root:bitcoin $dir
                    s chmod 750 $dir

                    # pruning decreases the bitcoin dir to 2 gb, keeps
                    # just the recent blocks. can\'t do a few things like
                    # import a wallet dump.
                    # pruning works, but people had to do
                    # some manual stuff in joinmarket. I dun need the
                    # disk space, so not bothering yet, maybe in a year or so.
                    # https://github.com/JoinMarket-Org/joinmarket/issues/431
                    #https://bitcoin.org/en/release/v0.12.0#wallet-pruning
                    #prune=550

                    f=$dir/bitcoin.conf
                    s dd of=$f <<EOF
server=1
# necessary for joinmarket, not bad in general
rpcpassword=$(openssl rand -base64 32)
rpcuser=$(openssl rand -base64 32)
EOF

                    # dunno about sharing a wallet between multiple instances
                    # manually did, wallet.dat symlinked in /nocow/.bitcoin
                    sgo bitcoind
                fi
                ;;
            # other distros unknown
        esac



        ## disabling joinmarket, its too expensive
        ### begin joinmarket setup ###

        case $distro in
            debian)
                f=$dir/bitcoin.conf
                f2=$dir/bitcoinjm.conf
                s cp $f $f2
                s tee -a $f2 >/dev/null <<EOF
# Joinmarket
walletnotify=curl -sI --connect-timeout 1 http://localhost:62602/walletnotify?%s
alertnotify=curl -sI --connect-timeout 1 http://localhost:62602/alertnotify?%s
wallet=joinmarket.dat
EOF

                ;;
            # other distros unknown
        esac

        pi libsodium-dev python-pip
        cd /a/opt/joinmarket
        # using develop branch, as it seems to be mostly bug fixes,
        # and this is quite new software.
        # note: python3 does not work.
        # has seg fault error due to some bug, but it still works
        pip install -r requirements.txt || [[ $? == 139 ]]
        # note, the target must exist ahead of time, or bitcoin
        # just overwrites the link, and it\'s not happy with an empty file,
        # so we have to create the wallet, then move and link it.
        s lnf -T /q/bitcoin/wallet.dat /nocow/.bitcoin/wallet.dat
        s lnf -T /q/bitcoin/joinmarket.dat /nocow/.bitcoin/joinmarket.dat
        # not technically needed, but seems cleaner not to have
        # symlinks be root owned unlike everything else
        s chown -h bitcoin:bitcoin /nocow/.bitcoin/*

        for var in rpcuser rpcpassword; do
            u="$(s sed -rn "s/^$var=(.*)/\1/p" /etc/bitcoin/bitcoin.conf)"
            # escape backslashes
            u="${u//\\/\\\\\\\\}"
            # escape commas
            u="${u//,/\\,}"
            sed -ri "s,^(rpc_${var#rpc}\s*=).*,\1 $u," joinmarket.cfg
        done
        sed -ri "s/^\s*(blockchain_source\s*=).*/\1 bitcoin-rpc/" joinmarket.cfg
        ### end joinmarket setup ###
fi