#!/usr/bin/env bash
set -e

server=$1
type=$2
hostname=$3
branch=$4
if [ -z "$hostname" ]; then
    echo "USAGE: $0 server type hostname [branch]"
    echo "Installs an empty Ubuntu server in AWS with a Zulip server role."
    echo "* hostname is the current hostname/IP of the server"
    echo "* type is a list of puppet rules to be passed to scripts/lib/install"
    echo "  E.g. 'zulip::base,zulip::apt_repository,zulip::postgres_common'"
    echo "* hostname is to be the server's external hostname."
    echo "* branch is used to override the default branch to install from."
    echo "Reads configuration from $HOME/.zulip-install-server.conf."
    exit 1
fi
if ! echo "$hostname" | grep -q zulip; then
    echo "USAGE: $0 server type hostname [branch]"
    echo "Hostname must have zulip in it."
    exit 1
fi
set -x

zulip_ssh_config_file="$HOME/.zulip-install-server.conf"
amazon_key_file=$(crudini --get "$zulip_ssh_config_file" ssh amazon_key_file)
if ! [ -e "$amazon_key_file" ]; then
    echo "You need the amazon ssh key at $amazon_key_file"
    exit 1
fi

server_private_key_file=$(crudini --get "$zulip_ssh_config_file" ssh server_private_key_file)
if ! [ -e "$server_private_key_file" ]; then
    echo "You need a server ssh key at $server_private_key_file"
    exit 1
fi

if [ -n "${zulip_confdir-}" ]; then
    zulipconf_file="$zulip_confdir/zulip.conf"
    secrets_file="$zulip_confdir/zulip-secrets.conf"
    settings_file="$zulip_confdir/settings.py"
fi
if [ -z "$secrets_file" ]; then
    echo "Specify secrets_file via environment."
    exit 1
fi

zulip_repo=$(crudini --get "$zulip_ssh_config_file" repo repo_url)

if [ -z "$branch" ]; then
    branch=$(crudini --get "$zulip_ssh_config_file" repo default_branch)
fi

VIRTUALENV_NEEDED=$(if echo "$type" | grep -q app_frontend; then echo -n yes; else echo -n no; fi)

# Force RSA keys. We do this because the ECDSA key is not printed on syslog,
# and our puppet configuration does not use ECDSA. If we don't do this,
# we'll get key errors after puppet apply.
SSH_OPTS=(-o 'HostKeyAlgorithms=ssh-rsa')

set +e

ssh "${SSH_OPTS[@]}" "$server" -i "$amazon_key_file" -lubuntu -o "ControlMaster=no" /bin/bash <<EOF
sudo mkdir -p ~root/.ssh && sudo cp .ssh/authorized_keys /root/.ssh/authorized_keys
sudo sed -i 's/disable_root: true/disable_root: false/' /etc/cloud/cloud.cfg
sudo mkdir -p /etc/zulip
EOF
# shellcheck disable=SC2029 disable=SC2087
ssh "${SSH_OPTS[@]}" "$server" -i "$amazon_key_file" -lroot /bin/bash <<EOF
# Set the hostname early
echo "$hostname" > /etc/hostname
hostname "$hostname"
sed -i 's/localhost$/localhost $hostname/' /etc/hosts
EOF

set -e

# Give server its SSH keys
scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$server_private_key_file" root@"$server":/root/.ssh/id_rsa
scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$server_private_key_file".pub root@"$server":/root/.ssh/id_rsa.pub
scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$secrets_file" root@"$server":/etc/zulip/zulip-secrets.conf
if [ -e "$zulipconf_file" ]; then
    scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$zulipconf_file" root@"$server":/etc/zulip/zulip.conf
fi
if [ -e "$settings_file" ]; then
    scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$settings_file" root@"$server":/etc/zulip/settings.py
fi

# shellcheck disable=SC2029 disable=SC2087
ssh "${SSH_OPTS[@]}" "$server" -i "$amazon_key_file" -lroot /bin/bash <<EOF
set -x
# Finish setting up the SSH private key
chmod 600 /root/.ssh/id_rsa
# Delete the ubuntu user
if grep -q '^ubuntu:' /etc/passwd; then
    userdel ubuntu
fi
# Make sure root doesn't have a password
passwd -d root

apt-get update
apt-get -y upgrade

cd "\$(mktemp -d)"

# Get GitHub known_hosts setup
# TODO: Replace this with hardcoding the actual GitHub keys
ssh -oStrictHostKeyChecking=no git@github.com </dev/null >/dev/null || true

if ! [ -e "zulip" ]; then
    # need to install git to clone the repo
    apt-get install -y git crudini
    git clone "$zulip_repo" zulip
fi
cd zulip
git fetch
git checkout origin/$branch
# The main Zulip production install script can take things from here!
env VIRTUALENV_NEEDED=$VIRTUALENV_NEEDED PUPPET_CLASSES="$type" \
  ./scripts/setup/install --self-signed-cert --no-init-db --no-overwrite-settings
EOF

scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$server_private_key_file" root@"$server":/home/zulip/.ssh/id_rsa
scp "${SSH_OPTS[@]}" -i "$amazon_key_file" "$server_private_key_file".pub root@"$server":/home/zulip/.ssh/id_rsa.pub
# shellcheck disable=SC2029
ssh "${SSH_OPTS[@]}" "$server" -i "$amazon_key_file" -lroot /bin/bash <<EOF
chown zulip:zulip /home/zulip/.ssh/id_rsa*
chmod 600 /home/zulip/.ssh/id_rsa*
EOF
set +x
cat <<EOF

 Done.

EOF