// fg_commands.cxx - internal FGFS commands.

#include <simgear/compiler.h>
#include <simgear/misc/exception.hxx>

#include STL_STRING
#include STL_FSTREAM

#include <simgear/debug/logstream.hxx>
#include <simgear/misc/commands.hxx>
#include <simgear/misc/props.hxx>

#include <GUI/gui.h>
#include <Cockpit/panel.hxx>
#include <Cockpit/panel_io.hxx>
#include <Scenery/tilemgr.hxx>
#include <Time/tmp.hxx>

#include "fg_commands.hxx"

SG_USING_STD(string);
#if !defined(SG_HAVE_NATIVE_SGI_COMPILERS)
SG_USING_STD(ifstream);
SG_USING_STD(ofstream);
#endif

#include "fg_props.hxx"
#include "fg_io.hxx"
#include "globals.hxx"
#include "viewmgr.hxx"



////////////////////////////////////////////////////////////////////////
// Saved command states.
////////////////////////////////////////////////////////////////////////


/**
 * Base saved state for property commands.
 *
 * Since this class isn't publicly visible, it is simply an aggregate
 * of all the stuff any property command needs.
 */
class PropertyCommandState : public SGCommandState
{
public:
  PropertyCommandState (const SGPropertyNode * arg);
  virtual SGPropertyNode * getProp () const { return _prop; }
  virtual SGPropertyNode * getProp2 () const { return _prop2; }
  virtual const SGPropertyNode * getValue () const
    { return _value ? _value : &_dummy_0; }
  virtual const SGPropertyNode * getStep () const 
    { return _step ? _step : &_dummy_0; }
  virtual const SGPropertyNode * getMin () const { return _min; }
  virtual const SGPropertyNode * getMax () const { return _max; }
  virtual const SGPropertyNode * getWrap () const
    { return _wrap ? _wrap : &_dummy_0; }
  virtual const SGPropertyNode * getFactor () const 
    { return _factor ? _factor : &_dummy_1; }
  virtual const SGPropertyNode * getSquared () const 
    { return _squared ? _squared : &_dummy_1; }
  virtual const SGPropertyNode * getSetting () const 
    { return _setting ? _setting : &_dummy_0; }
  virtual const SGPropertyNode * getOffset () const
    { return _offset ? _offset : &_dummy_0; }
private:
  static SGPropertyNode _dummy_0;
  static SGPropertyNode _dummy_1;
  mutable SGPropertyNode * _prop;
  mutable SGPropertyNode * _prop2;
  const SGPropertyNode * _value;
  const SGPropertyNode * _step;
  const SGPropertyNode * _min;
  const SGPropertyNode * _max;
  const SGPropertyNode * _wrap;
  const SGPropertyNode * _factor;
  const SGPropertyNode * _squared;
  const SGPropertyNode * _setting;
  const SGPropertyNode * _offset;
};

SGPropertyNode PropertyCommandState::_dummy_0;
SGPropertyNode PropertyCommandState::_dummy_1;

PropertyCommandState::PropertyCommandState (const SGPropertyNode * arg)
  : SGCommandState(arg),
    _prop(fgGetNode(arg->getStringValue("property[0]", "/null"), true)),
    _prop2(fgGetNode(arg->getStringValue("property[1]", "/null"), true)),
    _value(arg->getNode("value")),
    _step(arg->getNode("step")),
    _min(arg->getNode("min")),
    _max(arg->getNode("max")),
    _wrap(arg->getNode("wrap")),
    _factor(arg->getNode("factor")),
    _squared(arg->getNode("squared")),
    _setting(arg->getNode("setting")),
    _offset(arg->getNode("offset"))
{
				// It would be better not to do this
				// every time, but it's not that big
				// a deal.  I don't know enough about
				// C++ static initialization to fix it.
  _dummy_1.setDoubleValue(1.0);
}




////////////////////////////////////////////////////////////////////////
// Command implementations.
////////////////////////////////////////////////////////////////////////


/**
 * Built-in command: do nothing.
 */
static bool
do_null (const SGPropertyNode * arg, SGCommandState ** state)
{
  return true;
}


/**
 * Built-in command: exit FlightGear.
 *
 * TODO: show a confirm dialog.
 */
static bool
do_exit (const SGPropertyNode * arg, SGCommandState ** state)
{
  SG_LOG(SG_INPUT, SG_ALERT, "Program exit requested.");
  ConfirmExitDialog();
  return true;
}


/**
 * Built-in command: load flight.
 *
 * file (optional): the name of the file to load (relative to current
 * directory).  Defaults to "fgfs.sav".
 */
static bool
do_load (const SGPropertyNode * arg, SGCommandState ** state)
{
  const string &file = arg->getStringValue("file", "fgfs.sav");
  ifstream input(file.c_str());
  if (input.good() && fgLoadFlight(input)) {
    input.close();
    SG_LOG(SG_INPUT, SG_INFO, "Restored flight from " << file);
    return true;
  } else {
    SG_LOG(SG_INPUT, SG_ALERT, "Cannot load flight from " << file);
    return false;
  }
}


/**
 * Built-in command: save flight.
 *
 * file (optional): the name of the file to save (relative to the
 * current directory).  Defaults to "fgfs.sav".
 */
static bool
do_save (const SGPropertyNode * arg, SGCommandState ** state)
{
  const string &file = arg->getStringValue("file", "fgfs.sav");
  SG_LOG(SG_INPUT, SG_INFO, "Saving flight");
  ofstream output(file.c_str());
  if (output.good() && fgSaveFlight(output)) {
    output.close();
    SG_LOG(SG_INPUT, SG_INFO, "Saved flight to " << file);
    return true;
  } else {
    SG_LOG(SG_INPUT, SG_ALERT, "Cannot save flight to " << file);
    return false;
  }
}


/**
 * Built-in command: (re)load the panel.
 *
 * path (optional): the file name to load the panel from 
 * (relative to FG_ROOT).  Defaults to the value of /sim/panel/path,
 * and if that's unspecified, to "Panels/Default/default.xml".
 */
static bool
do_panel_load (const SGPropertyNode * arg, SGCommandState ** state)
{
  string panel_path =
    arg->getStringValue("path",
			fgGetString("/sim/panel/path",
				    "Panels/Default/default.xml"));
  FGPanel * new_panel = fgReadPanel(panel_path);
  if (new_panel == 0) {
    SG_LOG(SG_INPUT, SG_ALERT,
	   "Error reading new panel from " << panel_path);
    return false;
  }
  SG_LOG(SG_INPUT, SG_INFO, "Loaded new panel from " << panel_path);
  current_panel->unbind();
  delete current_panel;
  current_panel = new_panel;
  current_panel->bind();
  return true;
}


/**
 * Built-in command: (re)load preferences.
 *
 * path (optional): the file name to load the panel from (relative
 * to FG_ROOT). Defaults to "preferences.xml".
 */
static bool
do_preferences_load (const SGPropertyNode * arg, SGCommandState ** state)
{
  const string &path = arg->getStringValue("path", "preferences.xml");
  SGPath props_path(globals->get_fg_root());
  props_path.append(path);
  SG_LOG(SG_INPUT, SG_INFO, "Reading global preferences from "
	 << props_path.str());
  try {
    readProperties(props_path.str(), globals->get_props());
  } catch (const sg_exception &e) {
    guiErrorMessage("Error reading global preferences: ", e);
    return false;
  }
  SG_LOG(SG_INPUT, SG_INFO, "Successfully read global preferences.");
  return true;
}


/**
 * Built-in command: cycle view.
 */
static bool
do_view_cycle (const SGPropertyNode * arg, SGCommandState ** state)
{
  globals->get_current_view()->set_view_offset(0.0);
  globals->set_current_view(globals->get_viewmgr()->next_view());
  if ( fgGetString("/sim/flight-model") == "ada" ) {
      globals->get_props()->setBoolValue( "/sim/hud/visibility", true );
      if ( globals->get_viewmgr()->get_current() == 1 ) {
          globals->get_props()->setBoolValue( "/sim/hud/visibility", false );
      }
  }
//   fgReshape(fgGetInt("/sim/startup/xsize"), fgGetInt("/sim/startup/ysize"));
  return true;
}


/**
 * Built-in command: capture screen.
 */
static bool
do_screen_capture (const SGPropertyNode * arg, SGCommandState ** state)
{
  fgDumpSnapShot();
  return true;
}


/**
 * Reload the tile cache.
 */
static bool
do_tile_cache_reload (const SGPropertyNode * arg, SGCommandState ** state)
{
    static const SGPropertyNode *master_freeze
	= fgGetNode("/sim/freeze/master");
    bool freeze = master_freeze->getBoolValue();
    SG_LOG(SG_INPUT, SG_INFO, "ReIniting TileCache");
    if ( !freeze ) {
	fgSetBool("/sim/freeze/master", true);
    }
    // BusyCursor(0);
    if ( global_tile_mgr.init() ) {
	// Load the local scenery data
	global_tile_mgr.update(fgGetDouble("/position/longitude-deg"),
			       fgGetDouble("/position/latitude-deg"));
    } else {
	SG_LOG( SG_GENERAL, SG_ALERT, 
		"Error in Tile Manager initialization!" );
	exit(-1);
    }
    // BusyCursor(1);
    if ( !freeze ) {
	fgSetBool("/sim/freeze/master", false);
    }
    return true;
}


/**
 * Update the lighting manually.
 */
static bool
do_lighting_update (const SGPropertyNode * arg, SGCommandState ** state)
{
  fgUpdateSkyAndLightingParams();
  return true;
}


/**
 * Built-in command: toggle a bool property value.
 *
 * property: The name of the property to toggle.
 */
static bool
do_property_toggle (const SGPropertyNode * arg, SGCommandState ** state)
{
  if (*state == 0)
    *state = new PropertyCommandState(arg);
  SGPropertyNode * prop = ((PropertyCommandState *)(*state))->getProp();
  return prop->setBoolValue(!prop->getBoolValue());
}


/**
 * Built-in command: assign a value to a property.
 *
 * property: the name of the property to assign.
 * value: the value to assign.
 */
static bool
do_property_assign (const SGPropertyNode * arg, SGCommandState ** state)
{
  if (*state == 0)
    *state = new PropertyCommandState(arg);
  SGPropertyNode * prop = ((PropertyCommandState *)(*state))->getProp();
  const SGPropertyNode * value =
    ((PropertyCommandState *)(*state))->getValue();

  switch (prop->getType()) {
  case SGPropertyNode::BOOL:
    return prop->setBoolValue(value->getBoolValue());
  case SGPropertyNode::INT:
    return prop->setIntValue(value->getIntValue());
  case SGPropertyNode::LONG:
    return prop->setLongValue(value->getLongValue());
  case SGPropertyNode::FLOAT:
    return prop->setFloatValue(value->getFloatValue());
  case SGPropertyNode::DOUBLE:
    return prop->setDoubleValue(value->getDoubleValue());
  case SGPropertyNode::STRING:
    return prop->setStringValue(value->getStringValue());
  default:
    return prop->setUnspecifiedValue(value->getStringValue());
  }
}


/**
 * Built-in command: increment or decrement a property value.
 *
 * property: the name of the property to increment or decrement.
 * step: the amount of the increment or decrement (default: 0).
 * min: the minimum allowed value (default: no minimum).
 * max: the maximum allowed value (default: no maximum).
 * wrap: true if the value should be wrapped when it passes min or max;
 *       both min and max must be present for this to work (default:
 *       false).
 */
static bool
do_property_adjust (const SGPropertyNode * arg, SGCommandState ** state)
{
  if (*state == 0)
    *state = new PropertyCommandState(arg);
  SGPropertyNode * prop = ((PropertyCommandState *)(*state))->getProp();
  const SGPropertyNode * step = ((PropertyCommandState *)(*state))->getStep();
  const SGPropertyNode * min = ((PropertyCommandState *)(*state))->getMin();
  const SGPropertyNode * max = ((PropertyCommandState *)(*state))->getMax();
  bool wrap = ((PropertyCommandState *)(*state))->getWrap()->getBoolValue();

  switch (prop->getType()) {
  case SGPropertyNode::BOOL:
    if (step->getBoolValue())
      return prop->setBoolValue(!prop->getBoolValue());
    else
      return true;
  case SGPropertyNode::INT: {
    int value = prop->getIntValue() + step->getIntValue();
    if (min && (value < min->getIntValue())) {
      if (wrap && max)
	value = max->getIntValue();
      else
	value = min->getIntValue();
    }
    if (max && value > max->getIntValue()) {
      if (wrap && min)
	value = min->getIntValue();
      else
	value = max->getIntValue();
    }
    return prop->setIntValue(value);
  }
  case SGPropertyNode::LONG: {
    long value = prop->getLongValue() + step->getLongValue();
    if (min && (value < min->getLongValue())) {
      if (wrap && max)
	value = max->getLongValue();
      else
	value = min->getLongValue();
    }
    if (max && value > max->getLongValue()) {
      if (wrap && min)
	value = min->getLongValue();
      else
	value = max->getLongValue();
    }
    return prop->setLongValue(value);
  }
  case SGPropertyNode::FLOAT: {
    float value = prop->getFloatValue() + step->getFloatValue();
    if (min && (value < min->getFloatValue())) {
      if (wrap && max)
	value = max->getFloatValue();
      else
	value = min->getFloatValue();
    }
    if (max && value > max->getFloatValue()) {
      if (wrap && min)
	value = min->getFloatValue();
      else
	value = max->getFloatValue();
    }
    return prop->setFloatValue(value);
  }
  case SGPropertyNode::DOUBLE:
  case SGPropertyNode::UNSPECIFIED:
  case SGPropertyNode::NONE: {
    double value = prop->getDoubleValue() + step->getDoubleValue();
    if (min && (value < min->getDoubleValue())) {
      if (wrap && max)
	value = max->getDoubleValue();
      else
	value = min->getDoubleValue();
    }
    if (max && value > max->getDoubleValue()) {
      if (wrap && min)
	value = min->getDoubleValue();
      else
	value = max->getDoubleValue();
    }
    return prop->setDoubleValue(value);
  }
  case SGPropertyNode::STRING: // doesn't make sense with strings
    SG_LOG(SG_INPUT, SG_ALERT, "Cannot adjust a string value");
    return false;
  default:
    SG_LOG(SG_INPUT, SG_ALERT, "Unknown value type");
    return false;
  }
}


/**
 * Built-in command: multiply a property value.
 *
 * property: the name of the property to multiply.
 * factor: the amount by which to multiply.
 */
static bool
do_property_multiply (const SGPropertyNode * arg, SGCommandState ** state)
{
  if (*state == 0)
    *state = new PropertyCommandState(arg);
  SGPropertyNode * prop = ((PropertyCommandState *)(*state))->getProp();
  const SGPropertyNode * factor =
    ((PropertyCommandState *)(*state))->getFactor();

  switch (prop->getType()) {
  case SGPropertyNode::BOOL:
    return prop->setBoolValue(prop->getBoolValue() &&
			      factor->getBoolValue());
  case SGPropertyNode::INT:
    return prop->setIntValue(int(prop->getIntValue()
				 * factor->getDoubleValue()));
  case SGPropertyNode::LONG:
    return prop->setLongValue(long(prop->getLongValue()
				   * factor->getDoubleValue()));
  case SGPropertyNode::FLOAT:
    return prop->setFloatValue(float(prop->getFloatValue()
				     * factor->getDoubleValue()));
  case SGPropertyNode::DOUBLE:
  case SGPropertyNode::UNSPECIFIED:
  case SGPropertyNode::NONE:
    return prop->setDoubleValue(prop->getDoubleValue()
				* factor->getDoubleValue());
  default:			// doesn't make sense with strings
    return false;
  }
}


/**
 * Built-in command: swap two property values.
 *
 * property[0]: the name of the first property.
 * property[1]: the name of the second property.
 */
static bool
do_property_swap (const SGPropertyNode * arg, SGCommandState ** state)
{
  if (*state == 0)
    *state = new PropertyCommandState(arg);
  SGPropertyNode * prop1 = ((PropertyCommandState *)(*state))->getProp();
  SGPropertyNode * prop2 = ((PropertyCommandState *)(*state))->getProp2();

				// FIXME: inefficient
  const string & tmp = prop1->getStringValue();
  return (prop1->setUnspecifiedValue(prop2->getStringValue()) &&
	  prop2->setUnspecifiedValue(tmp));
}


/**
 * Set a property to an axis or other moving input.
 *
 * property: the name of the property to set.
 * setting: the current input setting, usually between -1.0 and 1.0.
 * offset: the offset to shift by, before applying the factor.
 * factor: the factor to multiply by (use negative to reverse).
 */
static bool
do_property_scale (const SGPropertyNode * arg, SGCommandState ** state)
{
  if (*state == 0)
    *state = new PropertyCommandState(arg);
  SGPropertyNode * prop = ((PropertyCommandState *)(*state))->getProp();
  double setting =
    ((PropertyCommandState *)(*state))->getSetting()->getDoubleValue();
  double offset =
    ((PropertyCommandState *)(*state))->getOffset()->getDoubleValue();
  double factor =
    ((PropertyCommandState *)(*state))->getFactor()->getDoubleValue();
  bool squared =
    ((PropertyCommandState *)(*state))->getSquared()->getBoolValue();

  double result = (setting + offset) * factor;
  if (squared)
    result = (result < 0 ? -1 : 1) * result * result;

  return prop->setDoubleValue(result);
}



////////////////////////////////////////////////////////////////////////
// Command setup.
////////////////////////////////////////////////////////////////////////


/**
 * Table of built-in commands.
 *
 * New commands do not have to be added here; any module in the application
 * can add a new command using globals->get_commands()->addCommand(...).
 */
static struct {
  const char * name;
  SGCommandMgr::command_t command;
} built_ins [] = {
    { "null", do_null },
    { "exit", do_exit },
    { "load", do_load },
    { "save", do_save },
    { "panel-load", do_panel_load },
    { "preferences-load", do_preferences_load },
    { "view-cycle", do_view_cycle },
    { "screen-capture", do_screen_capture },
    { "tile-cache-reload", do_tile_cache_reload },
    { "lighting-update", do_lighting_update },
    { "property-toggle", do_property_toggle },
    { "property-assign", do_property_assign },
    { "property-adjust", do_property_adjust },
    { "property-multiply", do_property_multiply },
    { "property-swap", do_property_swap },
    { "property-scale", do_property_scale },
    { 0, 0 }			// zero-terminated
};


/**
 * Initialize the default built-in commands.
 *
 * Other commands may be added by other parts of the application.
 */
void
fgInitCommands ()
{
  SG_LOG(SG_GENERAL, SG_INFO, "Initializing basic built-in commands:");
  for (int i = 0; built_ins[i].name != 0; i++) {
    SG_LOG(SG_GENERAL, SG_INFO, "  " << built_ins[i].name);
    globals->get_commands()->addCommand(built_ins[i].name,
					built_ins[i].command);
  }
}

// end of fg_commands.hxx