#!/bin/bash

# Copyright (C) 2014 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.

lna3_chat_file=/etc/ppp/peers/lna3_chat
function usage {
    echo "$(basename $0) [firmware image SKU]"
    echo "The firmware image SKU is optional."
    echo "If not specified, the image SKU is queried (recommended)."
    echo "Current valid SKU's are 0 and 1"
    echo "Only LE910-NA1 is supported"
    exit 1
}

if (($# > 0)) ; then
    fw="$1"

    if [[ fw =~ ^[0-9]+$ ]] ; then
        if ((fw < 0)) || ((fw > 1)) ; then
            usage
        fi
    else
        if ((fw > 1))  || ((fw < 0)) ; then
            echo "Invalid firmware SKU value"
            usage
        fi
    fi
else

    ((query=0))
    lna3_chat_file=/etc/ppp/peers/lna3_chat
    model=$(radio-query --model 2>/dev/null)
    if [[ $model != "LE910-NA1" ]] ; then
    # Nothing to do
        exit 0
    fi
    fw=$(radio-query --active-firmware 2>/dev/null) || ((fw=-1))
    if ((fw == -1)) ; then
        echo Active firmware query failed.
        echo Assuming firmware 1
    fi
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/" $lna3_chat_file
else
    # Set non-Verizon APN in chat file
    # if sed -r -i "s/^(#comment by mlinux-set-apn )* OK\s+'AT\+CGDCONT=3,\"IPV4V6\",\"[^\"]*\"'$/OK 'AT\+CGDCONT=3,\"IPV4V6\",\"${apn}\"'/" $lna3_chat_file ; then
    # (OK\s+'AT\+CGDCONT=3,\"IPV4V6\",\"(^\"]*\"'$)
    if sed -r -i "s/^(#comment by mlinux-set-apn )*(OK\s+'AT\+CGDCONT=3,\"IPV4V6\",\"[^\"]*\"'$)/\2/" $lna3_chat_file ; then
        echo "Set APN in $lna3_chat_file"
    else
        echo "Failed to set APN in $lna3_chat_file"
    fi
  exit 0
fi