#!/bin/bash

set -eu
cd "$(dirname "$0")"

# https://www.sovereign-stack.org/install/

# this script is not meant to be executed from the SSME; Let's let's check and abort if so.
if [ "$(hostname)" = ss-mgmt ]; then
    echo "ERROR: This command is meant to be executed from the bare metal management machine -- not the SSME."
    exit 1
fi

# the DISK variable here tells us which disk (partition) the admin wants to use for 
# lxd resources. By default, we provision the disk under / as a loop device. Admin
# can override with CLI modifications.
DISK="rpool/lxd"
export DISK="$DISK"

# install lxd snap and initialize it
if ! snap list | grep -q lxd; then
    sudo snap install lxd --channel=latest/candidate
    sleep 5

    # run lxd init
    cat <<EOF | lxd init --preseed
config: {}
networks:
- config:
    ipv4.address: auto
    ipv4.dhcp: true
    ipv4.nat: true
    ipv6.address: none
  description: "Default network bridge for ss-mgmt outbound network access."
  name: lxdbr0
  type: bridge
storage_pools:
- config:
    source: ${DISK}
  description: ""
  name: sovereign-stack
  driver: zfs
profiles:
- config: {}
  description: ""
  devices:
    enp5s0:
      name: enp5s0
      network: lxdbr0
      type: nic
    root:
      path: /
      pool: sovereign-stack
      type: disk
  name: default
projects: []

EOF

fi

# if the ss-mgmt doesn't exist, create it.
SSH_PUBKEY_PATH="$HOME/.ssh/id_rsa.pub"
FROM_BUILT_IMAGE=false
if ! lxc list --format csv | grep -q ss-mgmt; then

    # TODO check to see if there's an existing ss-mgmt image to spawn from, otherwise do this.
    if lxc image list | grep -q ss-mgmt; then
        FROM_BUILT_IMAGE=true
        lxc init ss-mgmt ss-mgmt --vm -c limits.cpu=4 -c limits.memory=4GiB --profile=default
    else
        lxc init "images:$BASE_LXC_IMAGE" ss-mgmt --vm -c limits.cpu=4 -c limits.memory=4GiB --profile=default
    fi

fi

# mount the pre-verified sovereign stack git repo into the new vm
if ! lxc config device show ss-mgmt | grep -q ss-code; then
    lxc config device add ss-mgmt ss-code disk source="$(pwd)" path=/home/ubuntu/sovereign-stack
fi

# create the ~/ss path and mount it into the vm.
source ./deployment/deployment_defaults.sh
source ./deployment/base.sh

mkdir -p "$SS_ROOT_PATH"

if ! lxc config device show ss-mgmt | grep -q ss-root; then
    lxc config device add ss-mgmt ss-root disk source="$SS_ROOT_PATH" path=/home/ubuntu/ss
fi

# # if a ~/.bitcoin/testnet3/blocks direrectory exists, mount it in.
# BITCOIN_DIR="$HOME/.bitcoin"
# REMOTE_BITCOIN_CACHE_PATH="/home/ubuntu/ss/cache/bitcoin"
# BITCOIN_TESTNET_BLOCKS_PATH="$BITCOIN_DIR/testnet3/blocks"
# if [ -d "$BITCOIN_TESTNET_BLOCKS_PATH" ]; then
#     if ! lxc config device show ss-mgmt | grep -q ss-testnet-blocks; then
#         lxc config device add ss-mgmt ss-testnet-blocks disk source="$BITCOIN_TESTNET_BLOCKS_PATH" path=$REMOTE_BITCOIN_CACHE_PATH/testnet/blocks
#     fi
# fi

#     # if a ~/.bitcoin/testnet3/blocks direrectory exists, mount it in.
# BITCOIN_TESTNET_CHAINSTATE_PATH="$BITCOIN_DIR/testnet3/chainstate"
# if [ -d "$BITCOIN_TESTNET_CHAINSTATE_PATH" ]; then
#     if ! lxc config device show ss-mgmt | grep -q ss-testnet-chainstate; then
#         lxc config device add ss-mgmt ss-testnet-chainstate disk source="$BITCOIN_TESTNET_CHAINSTATE_PATH" path=$REMOTE_BITCOIN_CACHE_PATH/testnet/chainstate
#     fi
# fi

# # if a ~/.bitcoin/blocks dir exists, mount it in.
# BITCOIN_MAINNET_BLOCKS_PATH="$BITCOIN_DIR/blocks"
# if [ -d "$BITCOIN_MAINNET_BLOCKS_PATH" ]; then
#     if ! lxc config device show ss-mgmt | grep -q ss-mainnet-blocks; then
#         lxc config device add ss-mgmt ss-mainnet-blocks disk source="$BITCOIN_MAINNET_BLOCKS_PATH" path=$REMOTE_BITCOIN_CACHE_PATH/mainnet/blocks
#     fi
# fi

#     # if a ~/.bitcoin/testnet3/blocks direrectory exists, mount it in.
# BITCOIN_MAINNET_CHAINSTATE_PATH="$BITCOIN_DIR/chainstate"
# if [ -d "$BITCOIN_MAINNET_CHAINSTATE_PATH" ]; then
#     if ! lxc config device show ss-mgmt | grep -q ss-mainnet-blocks; then
#         lxc config device add ss-mgmt ss-mainnet-chainstate disk source="$BITCOIN_MAINNET_CHAINSTATE_PATH" path=$REMOTE_BITCOIN_CACHE_PATH/mainnet/chainstate
#     fi
# fi

# mount the ssh directory in there.
if [ -f "$SSH_PUBKEY_PATH" ]; then
    if ! lxc config device show ss-mgmt | grep -q ss-ssh; then
        lxc config device add ss-mgmt ss-ssh disk source="$HOME/.ssh" path=/home/ubuntu/.ssh
    fi
fi

# start the vm if it's not already running
if lxc list --format csv | grep -q "ss-mgmt,STOPPED"; then
    lxc start ss-mgmt
    sleep 10
fi

# wait for the vm to have an IP address
. ./management/wait_for_lxc_ip.sh

# wait for the VM to complete its default cloud-init.
while lxc exec ss-mgmt -- [ ! -f /var/lib/cloud/instance/boot-finished ]; do
    sleep 1
done

# do some other preparations for user experience
lxc file push ./management/bash_aliases ss-mgmt/home/ubuntu/.bash_aliases
lxc file push ./management/bash_profile ss-mgmt/home/ubuntu/.bash_profile
lxc file push ./management/bashrc ss-mgmt/home/ubuntu/.bashrc
lxc file push ./management/motd ss-mgmt/etc/update-motd.d/sovereign-stack

# install SSH
lxc exec ss-mgmt apt-get update
lxc exec ss-mgmt -- apt-get install -y openssh-server
lxc file push ./management/sshd_config ss-mgmt/etc/ssh/sshd_config
lxc exec ss-mgmt -- sudo systemctl restart sshd

# add 'ss-manage' to the bare metal ~/.bashrc
ADDED_COMMAND=false
if ! < "$HOME/.bashrc" grep -q "ss-manage"; then
    echo "alias ss-manage='$(pwd)/manage.sh \$@'" >> "$HOME/.bashrc"
    ADDED_COMMAND=true
fi

wait-for-it -t 300 "$IP_V4_ADDRESS:22" > /dev/null 2>&1

# Let's remove any entry in our known_hosts, then add it back.
# we are using IP address here so we don't have to rely on external DNS 
# configuration for the base image preparataion.
ssh-keygen -R "$IP_V4_ADDRESS"

ssh-keyscan -H -t ecdsa "$IP_V4_ADDRESS" >> "$SSH_HOME/known_hosts"

ssh "ubuntu@$IP_V4_ADDRESS" sudo chown -R ubuntu:ubuntu /home/ubuntu


if [ "$FROM_BUILT_IMAGE" = false ]; then
    ssh "ubuntu@$IP_V4_ADDRESS" /home/ubuntu/sovereign-stack/management/provision.sh

    lxc stop ss-mgmt

    if ! lxc image list | grep -q "ss-mgmt"; then
        lxc publish ss-mgmt --alias=ss-mgmt
    fi

    lxc start ss-mgmt
fi

if [ "$ADDED_COMMAND" = true ]; then
    echo "NOTICE! You need to run 'source ~/.bashrc' before continuing. After that, type 'ss-manage' to enter your management environment."
fi