/*
    Copyright (C) 2007 Paul Davis
    Author: David Robillard

    This program 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 program 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 program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <iostream>
#include "ardour/automation_control.h"
#include "ardour/automation_watch.h"
#include "ardour/event_type_map.h"
#include "ardour/session.h"

#include "pbd/memento_command.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;

AutomationControl::AutomationControl(ARDOUR::Session&                          session,
                                     const Evoral::Parameter&                  parameter,
                                     const ParameterDescriptor&                desc,
                                     boost::shared_ptr<ARDOUR::AutomationList> list,
                                     const string&                             name)
	: Controllable (name.empty() ? EventTypeMap::instance().to_symbol(parameter) : name)
	, Evoral::Control(parameter, desc, list)
	, _session(session)
	, _desc(desc)
{
}

AutomationControl::~AutomationControl ()
{
}

/** Get the current effective `user' value based on automation state */
double
AutomationControl::get_value() const
{
	bool from_list = _list && ((AutomationList*)_list.get())->automation_playback();
	return Control::get_double (from_list, _session.transport_frame());
}

/** Set the value and do the right thing based on automation state
 *  (e.g. record if necessary, etc.)
 *  @param value `user' value
 */
void
AutomationControl::set_value (double value)
{
	bool to_list = _list && ((AutomationList*)_list.get())->automation_write();

	Control::set_double (value, _session.transport_frame(), to_list);

	Changed(); /* EMIT SIGNAL */
}

void
AutomationControl::set_list (boost::shared_ptr<Evoral::ControlList> list)
{
	Control::set_list (list);
	Changed();  /* EMIT SIGNAL */
}

void
AutomationControl::set_automation_state (AutoState as)
{
	if (_list && as != alist()->automation_state()) {

		alist()->set_automation_state (as);
		if (_desc.toggled) {
			return;  // No watch for boolean automation
		}

		if (as == Write) {
			/* get state for undo */
			_before = &alist ()->get_state ();
			AutomationWatch::instance().add_automation_watch (shared_from_this());
		} else if (as == Touch) {
			if (!touching()) {
				AutomationWatch::instance().remove_automation_watch (shared_from_this());
			} else {
				/* this seems unlikely, but the combination of
				 * a control surface and the mouse could make
				 * it possible to put the control into Touch
				 * mode *while* touching it.
				 */
				AutomationWatch::instance().add_automation_watch (shared_from_this());
			}
		} else {
			AutomationWatch::instance().remove_automation_watch (shared_from_this());
		}
	}
}

void
AutomationControl::set_automation_style (AutoStyle as)
{
	if (!_list) return;
	alist()->set_automation_style (as);
}

void
AutomationControl::start_touch(double when)
{
	if (!_list) {
		return;
	}

	if (!touching()) {

		if (alist()->automation_state() == Touch) {
			/* subtle. aligns the user value with the playback */
			set_value (get_value ());
			_before = &alist ()->get_state ();
			alist()->start_touch (when);
			if (!_desc.toggled) {
				AutomationWatch::instance().add_automation_watch (shared_from_this());
			}
		}
		set_touching (true);
	}
}

void
AutomationControl::stop_touch(bool mark, double when)
{
	if (!_list) return;
	if (touching()) {
		set_touching (false);

		if (alist()->automation_state() == Write) {
			_session.begin_reversible_command (string_compose (_("write %1 automation"), name ()));
			_session.add_command (new MementoCommand<AutomationList> (*alist ().get (), _before, &alist ()->get_state ()));
			_session.commit_reversible_command ();
		}

		if (alist()->automation_state() == Touch) {
			alist()->stop_touch (mark, when);
			if (!_desc.toggled) {
				AutomationWatch::instance().remove_automation_watch (shared_from_this());
			}

			_session.begin_reversible_command (string_compose (_("touch %1 automation"), name ()));
			_session.add_command (new MementoCommand<AutomationList> (*alist ().get (), _before, &alist ()->get_state ()));
			_session.commit_reversible_command ();
		}
	}
}

double
AutomationControl::internal_to_interface (double val) const
{
	if (_desc.integer_step) {
		// both upper and lower are inclusive.
		val =  (val - lower()) / (1 + upper() - lower());
	} else {
		val =  (val - lower()) / (upper() - lower());
	}

	if (_desc.logarithmic) {
		if (val > 0) {
			val = pow (val, 1./2.0);
		} else {
			val = 0;
		}
	}

	return val;
}

double
AutomationControl::interface_to_internal (double val) const
{
	if (_desc.logarithmic) {
		if (val <= 0) {
			val = 0;
		} else {
			val = pow (val, 2.0);
		}
	}

	if (_desc.integer_step) {
		val =  lower() + val * (1 + upper() - lower());
	} else {
		val =  lower() + val * (upper() - lower());
	}

	if (val < lower()) val = lower();
	if (val > upper()) val = upper();

	return val;
}