#! /bin/sh
set -euf

#PATH=$PWD/bin:$PATH
#export PATH

urlencode() {
#! /bin/sh
sed '
  s/%/%25/g
  s/ /%20/g
  s/!/%21/g
  s/"/%22/g
  s/#/%23/g
  s/\$/%24/g
  s/\&/%26/g
  s/'\''/%27/g
  s/(/%28/g
  s/)/%29/g
  s/\*/%2a/g
  s/+/%2b/g
  s/,/%2c/g
  s/-/%2d/g
  s/\./%2e/g
  s/\//%2f/g
  s/:/%3a/g
  s/;/%3b/g
  s//%3e/g
  s/?/%3f/g
  s/@/%40/g
  s/\[/%5b/g
  s/\\/%5c/g
  s/\]/%5d/g
  s/\^/%5e/g
  s/_/%5f/g
  s/`/%60/g
  s/{/%7b/g
  s/|/%7c/g
  s/}/%7d/g
  s/~/%7e/g
'
}
#

cac_cache=${cac_cache-$HOME/tmp/cac_listservers_cache.json}
cac_secrets=${cac_secrets-$HOME/.secrets/cac}

. "$cac_secrets" >/dev/null 2>&1 || :


cac() {
  __cac_cli__command=$1
  shift
  __cac_cli__"$__cac_cli__command" "$@"
}

# WIP
__cac_cli__help() {(
  exec sed < "$0" -n '
    s/^__cac_cli__\([^(]\+\)().*/\1/p
  '
)}

# usage: console 
__cac_cli__console() {(
  server=$(__cac_cli__getserver "$1")
  sid=$(echo $server | jq -r .sid)
  # TODO check reply status == ok
  _cac_post_api_v1 console sid="$sid" | jq -r .console
)}

__cac_cli__listservers() {
  jq -r . $cac_cache
}

__cac_cli__update() {(
  umask 0077
  servers=$(_cac_listservers)
  echo $servers > $cac_listservers_cache.tmp
  mv $cac_listservers_cache.tmp $cac_cache
)}

__cac_cli__getserver() {(

  case $1 in
    *:*)
      k=${1%%:*}
      v=${1#*:}
      ;;
    *)
      k=label
      v=${1#*:}
      ;;
  esac

  if result=$(jq \
      -e \
      --arg k "$k" \
      --arg v "$v" \
      '
        map(select(.[$k]==$v)) |
        if (. | length) == 1 then
          .[0]
        else
          null
        end
      ' \
        $cac_cache); then
    echo $result | jq -r .
  else
    echo "$0 getserver $k:$v => not unique server found" >&2
    exit 23
  fi
)}

__cac_cli__generatenetworking() {(
  server=$(__cac_cli__getserver "$1")

  hostname=$(echo $server | jq -r .label)

  address=$(echo $server | jq -r .ip)
  gateway=$(echo $server | jq -r .gateway)
  nameserver=8.8.8.8
  netmask=$(echo $server | jq -r .netmask)
  prefix=$(netmask-to-prefix $netmask)

  #printf '# Generated file: %s generatenetworking %s %s\n' "$0" "$1" "$2"
  #printf '# on %s\n' "$(date -Is)"
  #printf '\n'
  printf '_:\n'
  printf '\n'
  printf '{\n'
  printf '  networking.hostName = "%s";\n' $hostname
  printf '  networking.interfaces.enp2s1.ip4 = [\n'
  printf '    {\n'
  printf '      address = "%s";\n' $address
  printf '      prefixLength = %d;\n' $prefix
  printf '    }\n'
  printf '  ];\n'
  printf '  networking.defaultGateway = "%s";\n' $gateway
  printf '  networking.nameservers = [\n'
  printf '    "%s"\n' $nameserver
  printf '  ];\n'
  printf '}\n'
)}

__cac_cli__powerop() {(
  server=$(__cac_cli__getserver "$1")
  action=$2

  sid=$(echo $server | jq -r .sid)

  reply=$(_cac_post_api_v1 powerop sid="$sid" action="$action")

  case $(echo $reply | jq -r .status) in
    ok)
      echo $reply | jq -r . >&2
      __cac_cli__update
      ;;
    *)
      echo bad reply: >&2
      echo $reply | jq -r . >&2
      exit 23
      ;;
  esac
)}
__cac_cli__pushconfig() {(
  server=$(__cac_cli__getserver "$1")

  prefix=${2-/}

  hostname=$(echo $server | jq -r .label)

  address=$(echo $server | jq -r .ip)
  target=root@$address

  RSYNC_RSH='sshpass -e ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'
  SSHPASS=$(echo $server | jq -r .rootpass)
  export RSYNC_RSH SSHPASS

  pushgit .                         $target:$prefix/etc/nixos/
  pushgit hosts                     $target:$prefix/etc/nixos/hosts/
  pushgit tmp/nixpkgs/$hostname     $target:$prefix/etc/nixos/nixpkgs/
  pushdir secrets/$hostname/nix     $target:$prefix/etc/nixos/secrets/
  pushdir secrets/$hostname/rsync   $target:$prefix/
  echo "_:{imports=[./modules/$hostname];}" \
    | $RSYNC_RSH "$target" tee "$prefix/etc/nixos/configuration.nix" \
      > /dev/null

  ## TODO chmod and chown secrets
)}

__cac_cli__setlabel() {(
  server=$(__cac_cli__getserver "$1")
  label=$2

  sid=$(echo $server | jq -r .sid)

  reply=$(_cac_post_api_v1 renameserver sid="$sid" name="$label")

  case $(echo $reply | jq -r .status) in
    ok)
      echo $reply | jq -r . >&2
      __cac_cli__update
      ;;
    *)
      echo bad reply: >&2
      echo $reply | jq -r . >&2
      exit 23
      ;;
  esac
)}

__cac_cli__setmode() {(
  server=$(__cac_cli__getserver "$1")
  mode=$2

  sid=$(echo $server | jq -r .sid)

  reply=$(_cac_post_api_v1 runmode sid="$sid" mode="$mode")

  case $(echo $reply | jq -r .status) in
    ok)
      echo $reply | jq -r . >&2
      __cac_cli__update
      ;;
    *)
      echo bad reply: >&2
      echo $reply | jq -r .
      exit 23
      ;;
  esac
)}

__cac_cli__ssh() {(
  server=$(__cac_cli__getserver "$1")
  shift

  address=$(echo $server | jq -r .ip)
  target=root@$address

  SSHPASS=$(echo $server | jq -r .rootpass)
  export SSHPASS

  exec sshpass -e ssh \
    -S none \
    -o StrictHostKeyChecking=no \
    -o UserKnownHostsFile=/dev/null \
    $target \
    "$@"
)}


# usage: ./cac waitstatus mode:Safe 'Powered On'
# blocks until server has specfied state
__cac_cli__waitstatus() {
  server=$(__cac_cli__getserver "$1")
  status=$(echo $server | jq -r .status)

  case $status in
    $2)
      return
      ;;
  esac

  echo "$(date -Is) Waiting for status: $2; current status: $status ..." >&2

  __cac_cli__waitforcacheupdate __cac_cli__waitstatus "$@"
}


# XXX for __cac_cli__waitforcacheupdate and __cac_cli__poll cache means $cac_cache

# blocks until cache has been updated then executes "$@"
__cac_cli__waitforcacheupdate() {
  case $(inotifywait --format %f -q -e moved_to $(dirname $cac_cache)) in
    $(basename $cac_cache)) "$@";;
    *) __cac_cli__waitforcacheupdate "$@";;
  esac
}

# usage: with cac ./cac poll 60s
# continuously update cache, sleeping at least $1 between updates
__cac_cli__poll() {
  __cac_cli__update
  t=${1-1m}
  echo "$(date -Is) cache updated; sleeping $t ..." >&2
  sleep "$t"
  __cac_cli__poll "$@"
}


_cac_listservers() {(
  servers=$(_cac_get_api_v1 listservers)
  status=$(echo $servers | jq -r .status)

  if [ "$status" = ok ]; then
    echo "$servers" | jq -r .data
  else
    echo "cac_listservers: bad listservers status: $status" >&2
    exit 1
  fi
)}




# rsyncfiles : lines filename |> local-dir x rsync-target -> ? |> ?
rsyncfiles() {(
  set -x
  rsync \
    --rsync-path="mkdir -p \"$2\" && rsync" \
    -vzrlptD \
    --files-from=- \
    "$1"/ \
    "$2"
)}


# gitfiles : git-work-tree -> lines filename
gitfiles() {
  git -C "$1" archive --format=tar HEAD | tar t | sed '/\/$/d'
}

# pushgit : git-work-tree x rsync-target -> ?
pushgit() {
  gitfiles "$1" | rsyncfiles "$1" "$2"
}

# dirfiles : local-dir -> lines filename
dirfiles() {(
  cd "$1"
  find . -type f | sed 's/^\.\///'
)}

# pushdir : local-dir x rsync-target -> ?
pushdir() {
  dirfiles "$1" | rsyncfiles "$1" "$2"
}






_cac_get_api_v1() {
  _cac_curl_api_v1 -G "$@"
}

_cac_post_api_v1() {
  _cac_curl_api_v1 -XPOST "$@"
}

_cac_curl_api_v1() {
  _cac_exec curl -sS "$1" "https://panel.cloudatcost.com/api/v1/$2.php" $(
    shift 2
    set -- "$@" login="$cac_login" key="$cac_key"
    for arg; do
      echo -d $(printf '%s' "$arg" | urlencode)
    done
  )
}

_cac_exec() {
  if test -z "${cac_via-}"; then
    env -- "$@"
  else
    ssh -q "$cac_via" -t "$@"
  fi
}





case ${run-true} in
  true) cac "$@";;
esac