#!/bin/bash

# Copyright (C) 2014,2017 Multi-Tech Systems

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

function usage {
	echo "Usage: $(basename $0) [--] APN"
        echo "Or  $(basename $0)  -c to clear the APN line"
        echo "-- is requied if the APN begins with -"
        echo "Radio must be ready to set the APN"
	exit 1
}

((clear=0))
if (($# < 1)); then
  usage
fi
if [[ $1 == "--" ]] ; then
  apn=$2
elif [[ $1 == "-c" ]] ; then
  clear=1
elif [[ $1 =~ ^- ]] ; then
  usage
else
  apn=$1
fi
gsm_chat_file=/etc/ppp/peers/gsm_chat
lvw2_chat_file=/etc/ppp/peers/lvw2_chat
leu1_chat_file=/etc/ppp/peers/leu1_chat
lna3_chat_file=/etc/ppp/peers/lna3_chat

radioproduct=$(/usr/sbin/mts-io-sysfs show product-id) # LNA3?

model=$(radio-query --model 2>/dev/null)
if (($? != 0)) ; then
   echo "Radio is not ready or not found and cannot determine the type"
   exit 1
fi

# Only support LNA3

if [[ $model == LE910-NA1 ]] && [[ $radioproduct =~ -LNA3- ]] ; then
  if ((clear != 1)) ; then
    if sed -r -i "s/^(#comment by mlinux-set-apn )*OK\s+'AT\+CGDCONT=3,\"([^\"]*)\",\"[^\"]*\"'$/OK 'AT\+CGDCONT=3,\"\2\",\"${apn}\"'/" $lna3_chat_file ; then
        echo "Set APN to \"${apn}\" in $lna3_chat_file"
    else
        echo "Failed to set APN in $lna3_chat_file"
    fi
    fw=$(radio-query --active-firmware 2>/dev/null)
    if (($? != 0)) ; then
        echo "Radio query for active firmware failed, so clear APN"
        fw=1
    fi
    
    if (( fw == 1 )) ; then
        # Verizon is active, so comment out the APN
        echo "Temporarily commenting out APN, since Verizon is active and no APN is allowed in a Verizon chat file."
        sed -r -i "s/^(OK\s+'AT\+CGDCONT=3,\"[^/]*\",\"[^\"]*\"'$)/#comment by mlinux-set-apn \1/" $lna3_chat_file
    fi
  else
    if sed -r -i "s/^(OK\s+'AT\+CGDCONT=3,\"[^/]*\",\"[^\"]*\"'$)/#comment by mlinux-set-apn \1/" $lna3_chat_file ; then
        echo "Commented out APN in $lna3_chat_file"
    else
        echo "Failed to comment out APN in $lna3_chat_file"
    fi
  fi
  exit 0
else
  echo "Radio in product-id must be -LNA3- for LE910-NA1"
  echo "Radio model is \"$model\", product-id is \"$radioproduct\""
fi


if ((clear != 1)) ; then
    if sed -r -i "s/^(#comment by mlinux-set-apn )*OK\s+'AT\+CGDCONT=1,\"([^\"]*)\",\"[^\"]*\"'$/OK 'AT\+CGDCONT=1,\"\2\",\"${apn}\"'/" $gsm_chat_file ; then
        echo "Set APN to \"${apn}\" in $gsm_chat_file"
    else
        echo "Failed to set APN in $gsm_chat_file"
    fi
    echo "Not allowed to set APN for $lvw2_chat_file"
    # We cannot set the APN for a Verizon modem
    # sed -r -i "s/^(#comment by mlinux-set-apn )*OK\s+'AT\+CGDCONT=3,\"IPV4V6\",\"[^\"]*\"'$/OK 'AT\+CGDCONT=3,\"IPV4V6\",\"${apn}\"'/" $lvw2_chat_file
    if sed -r -i "s/^(#comment by mlinux-set-apn )*OK\s+'AT\+CGDCONT=1,\"([^\"]*)\",\"[^\"]*\"'$/OK 'AT\+CGDCONT=1,\"\2\",\"${apn}\"'/" $leu1_chat_file ; then
        echo "Set APN to \"${apn}\" in $leu1_chat_file"
    else
        echo "Failed to set APN in $leu1_chat_file"
    fi
else
    if sed -r -i "s/^(OK\s+'AT\+CGDCONT=1,\"[^\"]*\",\"[^\"]*\"'$)/#comment by mlinux-set-apn \1/" $gsm_chat_file ; then
        echo "Commented out APN in $gsm_chat_file"
    else
        echo "Failed to comment out APN in $gsm_chat_file"
    fi
    # Not setting APN in lvw2 is OK, since Verizon should not have an APN in a chat file.
    if sed -r -i "s/^(OK\s+'AT\+CGDCONT=3,\"[^\"]*\",\"[^\"]*\"'$)/#comment by mlinux-set-apn \1/" $lvw2_chat_file ; then
        echo "Commented out APN in $lvw2_chat_file"
    fi
    if sed -r -i "s/^(OK\s+'AT\+CGDCONT=1,\"[^\"]*\",\"[^\"]*\"'$)/#comment by mlinux-set-apn \1/" $leu1_chat_file ; then
        echo "Commented out APN in $leu1_chat_file"
    else
        echo "Failed to comment out APN in $leu1_chat_file"
    fi
fi
exit 0