#! /bin/sh -e
# 
# Copyright 2010 Emmet Hikory <persia@ubuntu.com>
#
# With thanks to Thom May and Otavio Salvador for documenting battery
# detection interfaces in laptop-detect
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
# 
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

usage () {
    echo "Usage: $0 [-h|--help|-v|--verbose|-V|--version]"
    echo ""
    echo "  -h | --help      print this help"
    echo "  -v | --verbose   be verbose (messages go to STDERR)"
    echo "  -V | --version   print version information"
}

VERBOSE=""
if [ "$1" != "" ]; then
    case "$1" in
        "-h" | "--help")
            usage
            exit 2
            ;;
        "-V" | "--version")
            echo "Version: @VERSION@"
            exit 2
            ;;
        --debug)
            set -x
            ;;
        "-v" | "--verbose")
            VERBOSE="Tell Me Everything!!!"
            ;;
    esac
fi

# Get resolution and screen size
if [ -x /usr/bin/xrandr ]; then
    RESOLUTION=$(/usr/bin/xrandr -q | awk -F, '/current/ {print $2 }')
    SIZE=$(/usr/bin/xrandr -q | awk -F\  '/ connected/ {print $(NF-2) " x " $NF }')
    [ -z "$VERBOSE" ] || xrandr --current --query 1>&2

    XRES=$(echo "$RESOLUTION" | cut -d\  -f3)
    [ -z "$VERBOSE" ] || echo X Resolution appears to be $XRES 1>&2
    YRES=$(echo "$RESOLUTION" | cut -d\  -f5)
    [ -z "$VERBOSE" ] || echo Y Resolution appears to be $YRES 1>&2

    XSIZE=$(echo "$SIZE" | cut -dx -f1 | tr -d \ m )
    [ -z "$VERBOSE" ] || echo X Size appears to be $XSIZE 1>&2
    YSIZE=$(echo "$SIZE" | cut -dx -f2 | tr -d \ m )
    [ -z "$VERBOSE" ] || echo Y Size appears to be $YSIZE 1>&2
else
    XRES=0
    YRES=0
    XSIZE=0
    YSIZE=0
fi

# Check for batteries
BATTERIES=0
BATTERY="/bin/false"

# ACPI Batteries (/proc/ interface)
if [ -d /proc/acpi/battery ]; then
    # Lie and pretend any battery detection is a single battery
    [ ! -z $(find /proc/acpi/battery -mindepth 1 -type d) ] && BATTERIES="1"
    [ -z "$VERBOSE" -o "$BATTERIES" -ne "0" ] || \
        echo Found ACPI Battery 1>&2
fi
"$BATTERY" || [ "$BATTERIES" -ne "0" ] && BATTERY="/bin/true"

# APM Batteries
if [ -d /proc/apm ]; then
    # Lie and pretend any battery detection is a single battery
    BATMASK=$(cut -d\ -f6 < /proc/apm)
    [ "$BATMASK" != "0xff" -a $BATMASK != "0x80" ] && BATTERIES="1"
    [ -z "$VERBOSE" -o "$BATTERIES" -ne "0" ] || \
        echo Found APM Battery 1>&2
fi
"$BATTERY" || [ "$BATTERIES" -ne "0" ] && BATTERY="/bin/true"

# PMU Batteries
if [ -d /proc/pmu ]; then
    BATTERIES=$(grep Battery /proc/pmu/info | cut -d: -f2)
    [ -z "$VERBOSE" -o "$BATTERIES" -ne "0" ] || \
         echo Found "$BATTERIES PMU" Batteries 1>&2
fi
"$BATTERY" || [ "$BATTERIES" -ne "0" ] && BATTERY="/bin/true"

# ACPI Batteries (/sys/ interface)
if [ -d /sys/class/power_supply ]; then
    BATTERIES=$(grep Battery /sys/class/power_supply/*/type 2>/dev/null | wc -l)
    [ -z "$VERBOSE" -o "$BATTERIES" -ne "0" ] || \
         echo Found "$BATTERIES" ACPI Batteries 1>&2
fi
"$BATTERY" || [ "$BATTERIES" -ne "0" ] && BATTERY="/bin/true"

# TODO: parse /proc/bus/input/devices to determine if there is a keyboard

# Determine the device type

# If the screen is tiny, it's probably a phone
if [ "$XSIZE" -ne "0" -a "$XSIZE" -lt "100" -a \
     "$YSIZE" -ne "0" -a "$YSIZE" -lt "60" ]; then
    [ -z "$VERBOSE" ] || echo "The screen is very small: probably a phone" 2>&1
    echo "phone"
fi

# If there is no battery, it's probably a desktop
if ! "$BATTERY"; then
    [ -z "$VERBOSE" ] || echo "There is no battery: probably a desktop" 2>&1
    echo "desktop"
fi

# If the resolution is low, it's probably a netbook
if [ "$XRES" -ne "0" -a "$XRES" -lt "1025" -a \
     "$YRES" -ne "0" -a "$YRES" -lt "601" ]; then
    [ -z "$VERBOSE" ] || echo "The resolution is low: probably a netbook" 2>&1
    echo "netbook"
    exit 0
fi

# Otherwise, it's probably a laptop
echo "laptop"
[ -z "$VERBOSE" ] || echo "Battery, sufficient screen: call it a laptop" 1>&2
exit 0