#!/usr/bin/env sh

#
#CF_Key="sdfsdfsdfljlbjkljlkjsdfoiwje"
#
#CF_Email="xxxx@sss.com"

CF_Api="https://api.cloudflare.com/client/v4"

########  Public functions #####################

#Usage: add  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
dns_cf_add() {
  fulldomain=$1
  txtvalue=$2

  CF_Key="${CF_Key:-$(_readaccountconf_mutable CF_Key)}"
  CF_Email="${CF_Email:-$(_readaccountconf_mutable CF_Email)}"
  if [ -z "$CF_Key" ] || [ -z "$CF_Email" ]; then
    CF_Key=""
    CF_Email=""
    _err "You didn't specify a cloudflare api key and email yet."
    _err "Please create the key and try again."
    return 1
  fi

  if ! _contains "$CF_Email" "@"; then
    _err "It seems that the CF_Email=$CF_Email is not a valid email address."
    _err "Please check and retry."
    return 1
  fi

  #save the api key and email to the account conf file.
  _saveaccountconf_mutable CF_Key "$CF_Key"
  _saveaccountconf_mutable CF_Email "$CF_Email"

  _debug "First detect the root zone"
  if ! _get_root "$fulldomain"; then
    _err "invalid domain"
    return 1
  fi
  _debug _domain_id "$_domain_id"
  _debug _sub_domain "$_sub_domain"
  _debug _domain "$_domain"

  _debug "Getting txt records"
  _cf_rest GET "zones/${_domain_id}/dns_records?type=TXT&name=$fulldomain"

  if ! printf "%s" "$response" | grep \"success\":true >/dev/null; then
    _err "Error"
    return 1
  fi

  # For wildcard cert, the main root domain and the wildcard domain have the same txt subdomain name, so
  # we can not use updating anymore.
  #  count=$(printf "%s\n" "$response" | _egrep_o "\"count\":[^,]*" | cut -d : -f 2)
  #  _debug count "$count"
  #  if [ "$count" = "0" ]; then
  _info "Adding record"
  if _cf_rest POST "zones/$_domain_id/dns_records" "{\"type\":\"TXT\",\"name\":\"$fulldomain\",\"content\":\"$txtvalue\",\"ttl\":120}"; then
    if printf -- "%s" "$response" | grep "$fulldomain" >/dev/null; then
      _info "Added, OK"
      return 0
    else
      _err "Add txt record error."
      return 1
    fi
  fi
  _err "Add txt record error."
  return 1
  #  else
  #    _info "Updating record"
  #    record_id=$(printf "%s\n" "$response" | _egrep_o "\"id\":\"[^\"]*\"" | cut -d : -f 2 | tr -d \" | head -n 1)
  #    _debug "record_id" "$record_id"
  #
  #    _cf_rest PUT "zones/$_domain_id/dns_records/$record_id" "{\"id\":\"$record_id\",\"type\":\"TXT\",\"name\":\"$fulldomain\",\"content\":\"$txtvalue\",\"zone_id\":\"$_domain_id\",\"zone_name\":\"$_domain\"}"
  #    if [ "$?" = "0" ]; then
  #      _info "Updated, OK"
  #      return 0
  #    fi
  #    _err "Update error"
  #    return 1
  #  fi

}

#fulldomain txtvalue
dns_cf_rm() {
  fulldomain=$1
  txtvalue=$2

  CF_Key="${CF_Key:-$(_readaccountconf_mutable CF_Key)}"
  CF_Email="${CF_Email:-$(_readaccountconf_mutable CF_Email)}"
  if [ -z "$CF_Key" ] || [ -z "$CF_Email" ]; then
    CF_Key=""
    CF_Email=""
    _err "You didn't specify a cloudflare api key and email yet."
    _err "Please create the key and try again."
    return 1
  fi

  _debug "First detect the root zone"
  if ! _get_root "$fulldomain"; then
    _err "invalid domain"
    return 1
  fi
  _debug _domain_id "$_domain_id"
  _debug _sub_domain "$_sub_domain"
  _debug _domain "$_domain"

  _debug "Getting txt records"
  _cf_rest GET "zones/${_domain_id}/dns_records?type=TXT&name=$fulldomain&content=$txtvalue"

  if ! printf "%s" "$response" | grep \"success\":true >/dev/null; then
    _err "Error"
    return 1
  fi

  count=$(printf "%s\n" "$response" | _egrep_o "\"count\":[^,]*" | cut -d : -f 2)
  _debug count "$count"
  if [ "$count" = "0" ]; then
    _info "Don't need to remove."
  else
    record_id=$(printf "%s\n" "$response" | _egrep_o "\"id\":\"[^\"]*\"" | cut -d : -f 2 | tr -d \" | head -n 1)
    _debug "record_id" "$record_id"
    if [ -z "$record_id" ]; then
      _err "Can not get record id to remove."
      return 1
    fi
    if ! _cf_rest DELETE "zones/$_domain_id/dns_records/$record_id"; then
      _err "Delete record error."
      return 1
    fi
    _contains "$response" '"success":true'
  fi

}

####################  Private functions below ##################################
#_acme-challenge.www.domain.com
#returns
# _sub_domain=_acme-challenge.www
# _domain=domain.com
# _domain_id=sdjkglgdfewsdfg
_get_root() {
  domain=$1
  i=2
  p=1
  while true; do
    h=$(printf "%s" "$domain" | cut -d . -f $i-100)
    _debug h "$h"
    if [ -z "$h" ]; then
      #not valid
      return 1
    fi

    if ! _cf_rest GET "zones?name=$h"; then
      return 1
    fi

    if _contains "$response" "\"name\":\"$h\"" >/dev/null; then
      _domain_id=$(printf "%s\n" "$response" | _egrep_o "\[.\"id\":\"[^\"]*\"" | head -n 1 | cut -d : -f 2 | tr -d \")
      if [ "$_domain_id" ]; then
        _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
        _domain=$h
        return 0
      fi
      return 1
    fi
    p=$i
    i=$(_math "$i" + 1)
  done
  return 1
}

_cf_rest() {
  m=$1
  ep="$2"
  data="$3"
  _debug "$ep"

  export _H1="X-Auth-Email: $CF_Email"
  export _H2="X-Auth-Key: $CF_Key"
  export _H3="Content-Type: application/json"

  if [ "$m" != "GET" ]; then
    _debug data "$data"
    response="$(_post "$data" "$CF_Api/$ep" "" "$m")"
  else
    response="$(_get "$CF_Api/$ep")"
  fi

  if [ "$?" != "0" ]; then
    _err "error $ep"
    return 1
  fi
  _debug2 response "$response"
  return 0
}
