#!/bin/bash

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This is a wrapper around a lot of different DBus calls, written in sh; this is
# meant to replace parts of flimflam-test, and also to be callable from crosh.

. /usr/lib/connectivity-common.sh
. /usr/lib/modem-common.sh

# Wait for a modem to reset itself and come back with a new DBus name
# args:
#   $1 - dbus name of the modem before reset
#   $2 - timeout in seconds
wait_for_modem_reset() {
  local modem
  local oldmodem="$1"
  local timeout="$2"
  local status="Timed out"
  echo -n "Waiting..."
  while test ${timeout} -gt 0; do
    modem=$(default_modem)
    if [ -n "${modem}" -a "${modem}" != "${oldmodem}" ]; then
      status="Done"
      break
    fi
    sleep 1
    timeout=$((timeout - 1))
    echo -n "."
  done
  echo "${status}"
}

# Wait for a modem to reset itself and come back with a new DBus name,
# or for the activation state to change from "1"
# MM_MODEM_ACTIVATION_STATE_ACTIVATING to something else
# Success is determined by the activation state changing or by having
# the newly assigned MDN.
#
# args:
#   $1 - dbus name of the modem before activation
#   $2 - activation state of modem before activation call
#   $3 - timeout in seconds
#   $4 - new mdn
#
wait_for_activation_change() {
  local modem
  local oldmodem="$1"
  local oldstate="$2"
  local timeout="$3"
  local expected_mdn="$4"
  local status="Timed out"
  local activation_state
  echo -n "Waiting..."
  while test ${timeout} -gt 0 ; do
    modem=$(default_modem)
    if [ -n "${modem}" -a "${modem}" != "${oldmodem}" ]; then
      status="Done"
      break
    fi
    if [ -n "${modem}" ]; then
      activation_state=$(mm_modem_activation_state "${modem}")
      if [ -n "${activation_state}" ]; then
        if [ ${activation_state} -gt 1 ]; then
          status="Done"
          break
        fi
      fi
    fi
    sleep 1
    timeout=$((timeout - 1))
    echo -n "."
  done
  activation_state=$(mm_modem_activation_state "${modem}")
  if [ -z "${activation_state}" ]; then
    status="Failed"
  elif [ ${activation_state} -le ${oldstate} ]; then
    status="Failed"
  fi
  if [ -n "${expected_mdn}" ]; then
    local mdn=$(mm_modem_status "${modem}" mdn)
    if [ "${expected_mdn}" = "${mdn}" ]; then
      status="Done"
    fi
  fi
  echo "${status}"
}

activate_manual() {
  $(arg_or_default modem $(default_modem))
  [ -z "${modem}" ] && error_exit "No modem found."
  local args=$(echo "$@" | sed -e 's/ /,/g')

  if is_mm1_modem "${modem}"; then
    error_exit "Manual activation is not supported on this modem."
  fi

  args=$(require "${args}" min)
  args=$(require "${args}" mdn)
  args=$(require "${args}" spc)
  args=$(require "${args}" system_id)
  local oldstate=$(mm_modem_activation_state "${modem}")
  dbus_call "${MM}" "${modem}" "${MM_IMODEM_CDMA}.ActivateManualDebug" \
    "dict:string:string:${args}"
  local mdn=$(echo "${args}" | sed -e s'/.*mdn,\([^,]*\).*/\1/g')
  wait_for_activation_change "${modem}" "${oldstate}" 40 "${mdn}"
}

activate() {
  $(arg_or_default modem $(default_modem))
  [ -z "${modem}" ] && error_exit "No modem found."
  # Work around braindead crosh quoting semantics (i.e., there are none,
  # arguments are tokenized on spaces). Sigh.
  local carrier=$(echo "$@")

  if is_mm1_modem "${modem}"; then
    mmcli -m "${modem}" --cdma-activate="${carrier}"
    return
  fi

  # TODO(jglasgow): verify that we can pass an empty string
  local oldstate=$(mm_modem_activation_state "${modem}")
  local status=$(dbus_call "${MM}" "${modem}" "${MM_IMODEM_CDMA}.Activate" \
    "string:${carrier}")
  if [ ${status} != 0 ]; then
    error "Failed to activate (error ${status})."
  else
    wait_for_activation_change "${modem}" "${oldstate}" 40
  fi
}

connect() {
  $(arg_or_default modem $(default_modem))
  [ -z "${modem}" ] && error_exit "No modem found."
  # Work around braindead quoting again...
  local args=$(echo "$@")

  if is_mm1_modem "${modem}"; then
    [ -n "${args}" ] && args="number=${args}"
    mmcli -m "${modem}" --simple-connect="${args}"
    return
  fi

  [ -z "${args}" ] && args='ignored'
  dbus_call "${MM}" "${modem}" "${MM_IMODEM}.Connect" "string:${args}"
}

factory_reset() {
  $(arg_or_default modem $(default_modem))
  [ -z "${modem}" ] && error_exit "No modem found."
  $(arg_or_prompt spc 000000)

  if is_mm1_modem "${modem}"; then
    # TODO(benchan): Evaluate if a warning should be given when factory
    # resetting under certain modem configurations.
    mmcli -m "${modem}" --factory-reset="${spc}"
    return
  fi

  technology=$(mm_modem_status "${modem}" technology)
  if [ "${technology}" = "CDMA" ]; then
    cat <<-EOF

    WARNING: Unless you have been instructed to do so by a Verizon
    Wireless customer service representative, factory resetting your
    modem will prevent you from re-connecting to the Verizon Wireless.

    If you have been instructed to issue the 'modem factory-reset'
    command, please make sure to issue the 'modem activate'
    command afterwards to re-activate your modem.  Do not use the
    graphic user interface to do so.

EOF
    $(arg_or_prompt continue n)
    if [ "${continue}" != "y" -a "${continue}" != "Y" ]; then
      echo "Factory reset cancelled."
      return
    fi
  fi
  dbus_call "${MM}" "${modem}" "${MM_IMODEM}.FactoryReset" "string:${spc}"
  wait_for_modem_reset "${modem}" 40
}

status() {
  all_modem_status 2>/dev/null
}

status_feedback() {
  all_modem_status 2>/dev/null | mask_modem_properties
}

update_prl() {
  local modem
  local mdn
  local min
  $(arg_or_default modem $(default_modem))
  [ -z "${modem}" ] && error_exit "No modem found."

  if is_mm1_modem "${modem}"; then
    error_exit "Updating PRL is not supported on this modem."
  fi

  $(needarg prlfile)
  mdn=$(mm_modem_status "${modem}" mdn)
  min=$(mm_modem_status "${modem}" min)
  if [ -z "${mdn}" -o -z "${min}" ]; then
    error_exit "Cannot update PRL: MDN/MIN are unknown."
  fi
  if [ ! -r "${prlfile}" ]; then
    error_exit "Cannot read PRL file \"${prlfile}\"."
  fi
  # Because cromo runs as a different user than this script,
  # it may not have access to the specified file, even when
  # the script does. A specific example is the Downloads folder,
  # which only the "chronos" user has access to. To work
  # around this problem, we copy the PRL file to /tmp.
  local tmpfile=$(mktemp --tmpdir prl.XXXXXXXXXX)
  trap "rm -f ${tmpfile}" 1 2 13 15
  cp "${prlfile}" "${tmpfile}"
  if [ $? -ne 0 ]; then
    rm -f "${tmpfile}"
    error_exit "Cannot copy \"${prlfile}\" to \"${tmpfile}\" directory."
  fi
  chmod 644 "${tmpfile}"
  local oldstate=$(mm_modem_activation_state "${modem}")
  args="mdn,${mdn},min,${min},prlfile,${tmpfile}"
  dbus_call "${MM}" "${modem}" "${MM_IMODEM_CDMA}.ActivateManualDebug" \
    "dict:string:string:${args}"
  wait_for_modem_reset "${modem}" 40
  rm -f "${tmpfile}"
}

set_carrier() {
  local modem

  $(arg_or_default modem $(default_modem))
  [ -z "${modem}" ] && error_exit "No modem found."

  if is_mm1_modem "${modem}"; then
    error_exit "Setting carrier is not supported on this modem."
  fi

  if [ $# -eq 0 ]; then
    echo "Missing argument: carrier"
    usage
  fi
  local carrier="$*"

  echo "Setting carrier to ${carrier}.  This could take up to two minutes."
  echo "Using modem ${modem}"

  dbus-send                                         \
    --reply-timeout=120000                          \
    --system                                        \
    --print-reply                                   \
    --dest="${MM}"                                  \
    "${modem}"                                      \
    org.chromium.ModemManager.Modem.Gobi.SetCarrier \
    "string:${carrier}"
}

MADISON_CONFIG_GROUP_LOCATION=/var/lib/cromo/madison-config-group

set_madison_config() {
  local group="$*"

  if [ -z "${group}" ]; then
    echo "No config group specified."
    echo "Usage: modem set-madison-config <config-group-name>"
    return
  fi

  if [ ! -w "${MADISON_CONFIG_GROUP_LOCATION}" ]; then
    echo "${MADISON_CONFIG_GROUP_LOCATION} is not a writable file."
    echo "Please reboot (or restart cromo) and try again.";
    return
  fi

  if [ "$(readlink -f ${MADISON_CONFIG_GROUP_LOCATION})" != \
       "${MADISON_CONFIG_GROUP_LOCATION}" ]; then
    echo "${MADISON_CONFIG_GROUP_LOCATION} points somewhere strange."
    echo "Please reboot (or restart cromo) and try again."
    return
  fi

  echo "Setting madison config group to ${group}."

  echo "${group}" > "${MADISON_CONFIG_GROUP_LOCATION}"

  echo "Please reboot (or restart cromo) to use the new config group."
}

usage() {
  echo "Usage: $0 <command> [args...]"
  echo "  activate [-modem <modem>] [<carrier>]        Activate modem"
  echo "  activate-manual [-modem <modem>] [args...]   Activate modem manually"
  echo "  connect [-modem <modem>] [phone number]      Connect modem"
  echo "  factory-reset [-modem <modem>] [<spc>]       Factory-reset the modem"
  echo "  status                                       Display modem status"
  echo "  update-prl [-modem <modem>] <prl-file-name>  Install a PRL file"
  echo "  set-carrier [-modem <modem>] <carrier-name>  Set modem carrier firmware"
  echo "  set-madison-config <config-group-name>       Set Madison config group"
  exit 0
}

$(needarg cmd)
case "${cmd}" in
  activate)
    activate "$@"
    ;;
  activate-manual)
    activate_manual "$@"
    ;;
  connect)
    connect "$@"
    ;;
  factory-reset)
    factory_reset "$@"
    ;;
  status)
    status "$@"
    ;;
  status-feedback)
    status_feedback "$@"
    ;;
  update-prl)
    update_prl "$@"
    ;;
  set-carrier)
    set_carrier "$@"
    ;;
  set-madison-config)
    set_madison_config "$@"
    ;;
  *)
    usage
    ;;
esac