########################################################################################
#
# $Id$
#
# FHEM module for one Firmata digial output pin
#
########################################################################################
#
#  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.
#
#  The GNU General Public License can be found at
#  http://www.gnu.org/copyleft/gpl.html.
#  A copy is found in the textfile GPL.txt and important notices to the license
#  from the author is found in LICENSE.txt distributed with these scripts.
#
#  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.
#
#  This copyright notice MUST APPEAR in all copies of the script!
#
########################################################################################

package main;

use strict;
use warnings;

#add FHEM/lib to @INC if it's not already 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";
		};
	};
};

use Device::Firmata::Constants  qw/ :all /;
use SetExtensions;

#####################################
sub
FRM_OUT_Initialize($)
{
  my ($hash) = @_;

  $hash->{SetFn}     = "FRM_OUT_Set";
  $hash->{DefFn}     = "FRM_Client_Define";
  $hash->{InitFn}    = "FRM_OUT_Init";
  $hash->{UndefFn}   = "FRM_Client_Undef";
  $hash->{AttrFn}    = "FRM_OUT_Attr";
  $hash->{StateFn}   = "FRM_OUT_State";
  
  $hash->{AttrList}  = "restoreOnReconnect:on,off restoreOnStartup:on,off activeLow:yes,no IODev valueMode:send,receive,bidirectional $main::readingFnAttributes";
  main::LoadModule("FRM");
}

sub
FRM_OUT_Init($$)
{
	my ($hash,$args) = @_;
	my $ret = FRM_Init_Pin_Client($hash,$args,PIN_OUTPUT);
	return $ret if (defined $ret);
	eval {
      my $firmata = FRM_Client_FirmataDevice($hash);
      my $pin = $hash->{PIN};
      $firmata->observe_digital($pin,\&FRM_OUT_observer,$hash);
	};  
	my $name = $hash->{NAME};
	if (! (defined AttrVal($name,"stateFormat",undef))) {
		$main::attr{$name}{"stateFormat"} = "value";
	}
	my $value = ReadingsVal($name,"value",undef);
	if (!defined($value)) {
		readingsSingleUpdate($hash,"value","off",0);
	}  
	if (AttrVal($hash->{NAME},"restoreOnReconnect", "on") eq "on") {
		FRM_OUT_Set($hash,$name,$value);
	}
	main::readingsSingleUpdate($hash,"state","Initialized",1);
	return undef;
}

sub
FRM_OUT_observer($$$$)
{
  my ($pin,$old,$new,$hash) = @_;
  my $name = $hash->{NAME};
  Log3 $name, 5, "onDigitalMessage for pin ".$pin.", old: ".(defined $old? $old : "--").", new: ".(defined $new? $new : "--");
  if (AttrVal($hash->{NAME}, "activeLow", "no") eq "yes") {
    $old = $old == PIN_LOW ? PIN_HIGH : PIN_LOW if (defined $old);
    $new = $new == PIN_LOW ? PIN_HIGH : PIN_LOW;
  }
  my $changed = !defined($old) || ($old != $new);
  if ($changed && (AttrVal($hash->{NAME}, "valueMode", "send") ne "send")) {
    main::readingsSingleUpdate($hash, "value", $new == PIN_HIGH? "on" : "off", 1);
  }
}

sub
FRM_OUT_Set($$$)
{
  my ($hash, $name, $cmd, @a) = @_;
  my $value;
  my $invert = AttrVal($hash->{NAME},"activeLow", "no");
  if (defined ($cmd)) {
    if ($cmd eq "on") {
      $value = $invert eq "yes" ? PIN_LOW : PIN_HIGH;
    } elsif ($cmd eq "off") {
      $value = $invert eq "yes" ? PIN_HIGH : PIN_LOW;
    } else {
      my $list = "on off";
      return SetExtensions($hash, $list, $name, $cmd, @a);
    }
    eval {
      FRM_Client_FirmataDevice($hash)->digital_write($hash->{PIN},$value);
      if (AttrVal($hash->{NAME}, "valueMode", "send") ne "receive") {
        main::readingsSingleUpdate($hash,"value",$cmd, 1);
      }
    };
    return $@;
  } else {
    return "no command specified";
  }
}

sub FRM_OUT_State($$$$)
{
	my ($hash, $tim, $sname, $sval) = @_;
	
STATEHANDLER: {
		$sname eq "value" and do {
			if (AttrVal($hash->{NAME},"restoreOnStartup", "on") eq "on") { 
				FRM_OUT_Set($hash,$hash->{NAME},$sval);
			}
			last;
		}
	}
}

sub
FRM_OUT_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;
        };
        $attribute eq "activeLow" and do {
          my $oldval = AttrVal($hash->{NAME},"activeLow", "no");
          if ($oldval ne $value) {
            # toggle output with attribute change
            $main::attr{$hash->{NAME}}{activeLow} = $value;
            if ($main::init_done) {
              my $value = ReadingsVal($name,"value",undef);
              FRM_OUT_Set($hash,$hash->{NAME},$value);
            }
          };
          last;
        };
      }
    }
  };
  if ($@) {
    $@ =~ /^(.*)( at.*FHEM.*)$/;
    $hash->{STATE} = "error setting $attribute to $value: ".$1;
    return "cannot $command attribute $attribute to $value for $name: ".$1;
  }
}

1;

=pod

  CHANGES

  2016 jensb
    o new sub FRM_OUT_observer, modified sub FRM_OUT_Init
      to receive output state from Firmata device
    o support attribute "activeLow"
  01.01.2018 jensb
    o create reading "value" in FRM_OUT_Init if missing
  02.01.2018 jensb
    o new attribute "valueMode" to control how "value" reading is updated
  14.01.2018 jensb
    o fix "uninitialised" when calling FRM_OUT_Set without command

=cut

=pod
=item device
=item summary Firmata: digital output
=item summary_DE Firmata: digitaler Ausang
=begin html

<a name="FRM_OUT"></a>
<h3>FRM_OUT</h3>
<ul>
  This module represents a pin of a <a href="http://www.firmata.org">Firmata device</a> 
  that should be configured as a digital output.<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">output_pins</a>"<br>
  of the FRM device (after connecting to the Firmata device) to be used as digital output.<br><br> 
  
  <a name="FRM_OUTdefine"></a>
  <b>Define</b>
  <ul>
  <code>define &lt;name&gt; FRM_OUT &lt;pin&gt;</code> <br>
  Defines the FRM_OUT device. &lt;pin&gt> is the arduino-pin to use.
  </ul><br>
  
  <a name="FRM_OUTset"></a>
  <b>Set</b><br>
  <ul>
  <code>set &lt;name&gt; on|off</code><br><br>
  </ul>
  <ul>
  <a href="#setExtensions">set extensions</a> are supported<br>
  </ul><br>
  
  <a name="FRM_OUTget"></a>
  <b>Get</b><br>
  <ul>
  N/A
  </ul><br>
  
  <a name="FRM_OUTattr"></a>
  <b>Attributes</b><br>
  <ul>
      <li>restoreOnStartup &lt;on|off&gt;, default: on<br>
      Set output value in Firmata device on FHEM startup (if device is already connected) and
      whenever the <em>setstate</em> command is used.
      </li>
      <li>restoreOnReconnect &lt;on|off&gt;, default: on<br>
      Set output value in Firmata device after IODev is initialized.
      </li>
      <li>activeLow &lt;yes|no&gt;, default: no</li>
      <li><a href="#IODev">IODev</a><br>
      Specify which <a href="#FRM">FRM</a> to use. (Optional, only required if there is more
      than one FRM-device defined.)
      </li>
      <li>valueMode &lt;send|receive|bidirectional&gt;, default: send<br>
      Define how the reading <em>value</em> is updated:<br>
      <ul>
        <li>send - after sending</li>
        <li>receive - after receiving</li>
        <li>bidirectional - after sending and receiving</li>
      </ul>
      </li>
      <li><a href="#eventMap">eventMap</a><br></li>
      <li><a href="#readingFnAttributes">readingFnAttributes</a><br></li>
  </ul><br>
  
  <a name="FRM_OUTnotes"></a>
  <b>Notes</b><br>
  <ul>
      <li>attribute <i>stateFormat</i><br>
      In most cases it is a good idea to assign "value" to the attribute <i>stateFormat</i>. This will show the state
      of the pin in the web interface.
      </li>
      <li>attribute <i>valueMode</i><br>
      For modes "receive<" and "bidirectional" to work the default Firmata application code must 
      be modified in function "<code>setPinModeCallback</code>":<br>
      add "<ins> || mode == OUTPUT</ins>" to the if condition for "<code>portConfigInputs[pin / 8] |= (1 << (pin & 7));</code>" to enable<br>
      reporting the output state (as if the pin were an input). This is of interest if you have custom code in your Firmata device that can change<br>
      the state of an output or you want a feedback from the Firmata device after the output state was changed.
      </li>
  </ul>
</ul><br>

=end html
=cut