########################################################################################
# $Id$
########################################################################################

=encoding UTF-8

=head1 NAME

FHEM module for one Firmata analog input pin

=head1 LICENSE AND COPYRIGHT

Copyright (C) 2013 ntruchess
Copyright (C) 2016 jensb

All rights reserved

This script is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This script is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this script; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

A copy of the GNU General Public License, Version 2 can also be found at

http://www.gnu.org/licenses/old-licenses/gpl-2.0.

This copyright notice MUST APPEAR in all copies of the script!

=cut

package main;

use strict;
use warnings;

#add FHEM/lib to @INC if it's not allready included. Should rather be in fhem.pl than here though...
BEGIN {
  if (!grep(/FHEM\/lib$/,@INC)) {
    foreach my $inc (grep(/FHEM$/,@INC)) {
      push @INC,$inc."/lib";
    };
  };
};

#####################################

# get command default return values
my %gets = (
  "reading"               => "",
  "state"                 => "",
  "alarm-upper-threshold" => "off",
  "alarm-lower-threshold" => "off",
);

sub FRM_AD_Initialize
{
  my ($hash) = @_;

  $hash->{AttrFn}    = "FRM_AD_Attr";
  $hash->{GetFn}     = "FRM_AD_Get";
  $hash->{DefFn}     = "FRM_Client_Define";
  $hash->{InitFn}    = "FRM_AD_Init";

  $hash->{AttrList}  = "IODev upper-threshold lower-threshold $main::readingFnAttributes";
  main::LoadModule("FRM");
}

sub FRM_AD_Init
{
  my ($hash,$args) = @_;
  my $name = $hash->{NAME};

  if (defined($main::defs{$name}{IODev_ERROR})) {
    return 'Perl module Device::Firmata not properly installed';
  }

  my $ret = FRM_Init_Pin_Client($hash, $args, Device::Firmata::Constants->PIN_ANALOG);
  if (defined($ret)) {
    readingsSingleUpdate($hash, 'state', "error initializing: $ret", 1);
    return $ret;
  }

  eval {
    my $firmata = FRM_Client_FirmataDevice($hash);
    my $resolution = 10;
    if (defined $firmata->{metadata}{analog_resolutions}) {
      $resolution = $firmata->{metadata}{analog_resolutions}{$hash->{PIN}}
    }
    $hash->{resolution} = $resolution;
    $hash->{".max"} = defined $resolution ? (1<<$resolution)-1 : 1024;
    $firmata->observe_analog($hash->{PIN},\&FRM_AD_observer,$hash);
  };
  if ($@) {
    $ret = FRM_Catch($@);
    readingsSingleUpdate($hash, 'state', "error initializing: $ret", 1);
    return $ret;
  }

  if (!(defined AttrVal($name,"stateFormat",undef))) {
    $main::attr{$name}{"stateFormat"} = "reading";
  }

  if (!(defined AttrVal($name,"event-min-interval",undef))) {
    $main::attr{$name}{"event-min-interval"} = 5;
  }

  main::readingsSingleUpdate($hash,"state","Initialized",1);

  return undef;
}

sub FRM_AD_observer
{
  my ($pin,$old,$new,$hash) = @_;
  my $name = $hash->{NAME};
  Log3 $name, 5, "$name: observer pin: ".$pin.", old: ".(defined $old ? $old : "--").", new: ".(defined $new ? $new : "--");
  main::readingsBeginUpdate($hash);
  main::readingsBulkUpdate($hash,"reading",$new,1);
  my $upperthresholdalarm = ReadingsVal($name,"alarm-upper-threshold","off");
  if ( $new < AttrVal($name,"upper-threshold",$hash->{".max"}) ) {
    if ( $upperthresholdalarm eq "on" ) {
      main::readingsBulkUpdate($hash,"alarm-upper-threshold","off",1);
    }
    my $lowerthresholdalarm = ReadingsVal($name,"alarm-lower-threshold","off");
    if ( $new > AttrVal($name,"lower-threshold",-1) ) {
      if ( $lowerthresholdalarm eq "on" ) {
        main::readingsBulkUpdate($hash,"alarm-lower-threshold","off",1);
      }
    } else {
      if ( $lowerthresholdalarm eq "off" ) {
        main::readingsBulkUpdate($hash,"alarm-lower-threshold","on",1);
      }
    }
  } else {
    if ( $upperthresholdalarm eq "off" ) {
      main::readingsBulkUpdate($hash,"alarm-upper-threshold","on",1);
    }
  };
  main::readingsEndUpdate($hash,1);
}

sub FRM_AD_Get
{
  my ($hash, $name, $cmd, @a) = @_;

  return "get command missing" if(!defined($cmd));
  return "unknown get command '$cmd', choose one of " . join(":noArg ", sort keys %gets) . ":noArg" if(!defined($gets{$cmd}));

  ARGUMENT_HANDLER: {
    $cmd eq "reading" and do {
      my $result = eval {
        if (defined($main::defs{$name}{IODev_ERROR})) {
          return 'Perl module Device::Firmata not properly installed';
        }
        return FRM_Client_FirmataDevice($hash)->analog_read($hash->{PIN});
      };
      return FRM_Catch($@) if ($@);
      return $result;
    };
    ( $cmd eq "alarm-upper-threshold" or $cmd eq "alarm-lower-threshold" or $cmd eq "state" ) and do {
      return main::ReadingsVal($name,"count",$gets{$cmd});
    };
  }
  return undef;
}

sub FRM_AD_Attr
{
  my ($command,$name,$attribute,$value) = @_;
  my $hash = $main::defs{$name};
  eval {
    if ($command eq "set") {
      ARGUMENT_HANDLER: {
        $attribute eq "IODev" and do {
          if ($main::init_done and (!defined ($hash->{IODev}) or $hash->{IODev}->{NAME} ne $value)) {
            FRM_Client_AssignIOPort($hash,$value);
            FRM_Init_Client($hash) if (defined ($hash->{IODev}));
          }
          last;
        };
      }
    }
  };
  if ($@) {
    my $ret = FRM_Catch($@);
    $hash->{STATE} = "$command $attribute error: " . $ret;
    return $hash->{STATE};
  }
}

1;

=pod

=head1 CHANGES

  2016 jensb
    o modified sub FRM_AD_Init to catch exceptions and return error message

  19.01.2018 jensb
    o support analog resolution depending on device capability

  24.08.2020 jensb
    o check for IODev install error in Init and Get
    o prototypes removed
    o set argument verifier added

  22.10.2020 jensb
    o annotaded module help of attributes for FHEMWEB

=cut


=head1 FHEM COMMANDREF METADATA

=over

=item device

=item summary Firmata: analog input

=item summary_DE Firmata: analoger Eingang

=back

=head1 INSTALLATION AND CONFIGURATION

=begin html

<a name="FRM_AD"/>
<h3>FRM_AD</h3>
<ul>
  This module represents a pin of a <a href="http://www.firmata.org">Firmata device</a>
  that should be configured as an analog input.<br><br>

  Requires a defined <a href="#FRM">FRM</a> device to work. The pin must be listed in the internal reading "<a href="#FRMinternals">analog_pins</a>"<br>
  of the FRM device (after connecting to the Firmata device) to be used as analog input.<br><br>

  <a name="FRM_ADdefine"/>
  <b>Define</b>
  <ul>
    <code>define &lt;name&gt; FRM_AD &lt;pin&gt;</code><br><br>

    Defines the FRM_AD device. &lt;pin&gt; is the arduino-pin to use.
  </ul><br>

  <a name="FRM_ADset"/>
  <b>Set</b><br>
  <ul>
    N/A<br>
  </ul><br>

  <a name="FRM_ADget"/>
  <b>Get</b><br>
  <ul>
    <li>reading<br>
    returns the voltage-level equivalent at the arduino-pin. The min value is zero and the max value<br>
    depends on the Firmata device (see internal reading "<a href="#FRMinternals">analog_resolutions</a>" of the FRM device.<br>
    For 10 bits resolution the range is 0 to 1023 (also see <a href="http://arduino.cc/en/Reference/AnalogRead">analogRead()</a> for details)<br></li>
    <li>alarm-upper-threshold<br>
    returns the current state of 'alarm-upper-threshold'. Values are 'on' and 'off' (Defaults to 'off')<br>
    'alarm-upper-threshold' turns 'on' whenever the 'reading' is higher than the attribute 'upper-threshold'<br>
    it turns 'off' again as soon 'reading' falls below 'alarm-upper-threshold'</li>
    <li>alarm-lower-threshold<br>
    returns the current state of 'alarm-lower-threshold'. Values are 'on' and 'off' (Defaults to 'off')<br>
    'alarm-lower-threshold' turns 'on' whenever the 'reading' is lower than the attribute 'lower-threshold'<br>
    it turns 'off' again as soon 'reading rises above 'alarm-lower-threshold'</li>
    <li>state<br>
    returns the 'state' reading</li>
  </ul><br>

  <a name="FRM_ADattr"/>
  <b>Attributes</b><br>
  <ul>
    <a name="upper-threshold"/>
    <li>upper-threshold<br>
    sets the 'upper-threshold'. Whenever the 'reading' exceeds this value 'alarm-upper-threshold' is set to 'on'<br>
    As soon 'reading' falls below the 'upper-threshold' 'alarm-upper-threshold' turns 'off' again<br>
    Defaults to the max pin resolution plus one.</li>

    <a name="lower-threshold"/>
    <li>lower-threshold<br>
    sets the 'lower-threshold'. Whenever the 'reading' falls below this value 'alarm-lower-threshold' is set to 'on'<br>
    As soon 'reading' rises above the 'lower-threshold' 'alarm-lower-threshold' turns 'off' again<br>
    Defaults to -1.</li>

    <a name="IODev"/>
    <li><a href="#IODev">IODev</a><br>
    Specify which <a href="#FRM">FRM</a> to use. Only required if there is more than one FRM-device defined.
    </li>

    <li><a href="#attributes">global attributes</a></li>

    <li><a href="#readingFnAttributes">readingFnAttributes</a></li>
  </ul><br>

  <a name="FRM_ADnotes"/>
  <b>Notes</b><br>
  <ul>
    <li>attribute <i>stateFormat</i><br>
    In most cases it is a good idea to assign "reading" to the attribute <i>stateFormat</i>. This will show the
    current value of the pin in the web interface.
    </li>
  </ul>
</ul><br>

=end html

=begin html_DE

<a name="FRM_AD"/>
<h3>FRM_AD</h3>
<ul>
  Die Modulbeschreibung von FRM_AD gibt es nur auf <a href="commandref.html#FRM_AD">Englisch</a>. <br>
</ul> <br>

=end html_DE

=cut