/* FormGraphics.C
 * FormGraphics Interface Class Implementation
 */

/* TODO:
 *      * Handle the case when the buffer is read-only.
 *          Initial work is done, if we are read-only the ok/cancel are 
 *          disabled. Probably we need to find a better way to deal with it.
 *      
 */

#include <config.h> 

#ifdef __GNUG__
#pragma implementation
#endif 

#include "lyx_gui_misc.h"
#include "input_validators.h"
#include "FormGraphics.h"
#include "form_graphics.h"
#include "Dialogs.h"
#include "LyXView.h"
#include "BufferView.h"

#include "debug.h" // for lyxerr

#include "support/lstrings.h" // for strToDbl & tostr
#include "support/FileInfo.h" // for FileInfo
#include "filedlg.h" // for LyXFileDlg
#include "support/filetools.h" // for AddName
#include "insets/insetgraphics.h"
#include "insets/insetgraphicsParams.h"

#include "RadioButtonGroup.h"

#include "support/LAssert.h"

using std::endl;


FormGraphics::FormGraphics(LyXView * lv, Dialogs * d)
	: FormInset(lv, d, _("Graphics"), new OkApplyCancelReadOnlyPolicy),
	  dialog_(0), inset_(0),
	  // The buttons c-tor values are the number of buttons we use
	  // This is only to reduce memory waste.
	  widthButtons(5), heightButtons(4), displayButtons(4),
	  last_image_path(".")
{
	// let the dialog be shown
	// This is a permanent connection so we won't bother
	// storing a copy because we won't be disconnecting.
	d->showGraphics.connect(slot(this, &FormGraphics::showDialog));
}


FormGraphics::~FormGraphics()
{
	// Remove all associations for the radio buttons
	widthButtons.reset();
	heightButtons.reset();
	displayButtons.reset();
	
	// Free the form.
	delete dialog_;
}


void FormGraphics::build()
{
	dialog_ = build_graphics();
	Assert(dialog_ != 0);
	if (!dialog_) {
		lyxerr << "ERROR: Failed to create the Graphics Inset dialog." << endl;
		return ;
	}

	// Workaround dumb xforms sizing bug
	minw_ = form()->w;
	minh_ = form()->h;

	// This is the place to add settings of the dialog that did not go
	// to the .fd file.

	// Set the input widgets to issue a callback to input() whenever
	// they change, so we can verify their content.
	fl_set_input_return (dialog_->input_width,
	                      FL_RETURN_CHANGED);
	fl_set_input_return (dialog_->input_height,
	                      FL_RETURN_CHANGED);
	fl_set_input_return (dialog_->input_filename,
	                      FL_RETURN_CHANGED);
	//    fl_set_input_return(dialog_->input_rotate_angle,
	//            FL_RETURN_CHANGED);

	// Set the maximum characters that can be written in the input texts.
	fl_set_input_maxchars(dialog_->input_width, WIDTH_MAXDIGITS);
	fl_set_input_maxchars(dialog_->input_height, HEIGHT_MAXDIGITS);
	fl_set_input_maxchars(dialog_->input_filename, FILENAME_MAXCHARS);
	fl_set_input_maxchars(dialog_->input_rotate_angle, ROTATE_MAXCHARS);

	// Set input filter on width and height to make them accept only
	// unsigned numbers.
	fl_set_input_filter(dialog_->input_width,
	                    fl_unsigned_int_filter);
	fl_set_input_filter(dialog_->input_height,
	                    fl_unsigned_int_filter);


	// Add the widgets of the width radio buttons to their group
	widthButtons.reset();
	widthButtons.registerRadioButton(dialog_->radio_width_default,
	                                 InsetGraphicsParams::DEFAULT_SIZE);
	widthButtons.registerRadioButton(dialog_->radio_width_cm,
	                                 InsetGraphicsParams::CM);
	widthButtons.registerRadioButton(dialog_->radio_width_inch,
	                                 InsetGraphicsParams::INCH);
	widthButtons.registerRadioButton(dialog_->radio_width_percent_page,
	                                 InsetGraphicsParams::PERCENT_PAGE);
	widthButtons.registerRadioButton(dialog_->radio_width_percent_column,
	                                 InsetGraphicsParams::PERCENT_COLUMN);

	// Add the widgets of the height radio buttons to their group
	heightButtons.reset();
	heightButtons.registerRadioButton(dialog_->radio_height_default,
	                                  InsetGraphicsParams::DEFAULT_SIZE);
	heightButtons.registerRadioButton(dialog_->radio_height_cm,
	                                  InsetGraphicsParams::CM);
	heightButtons.registerRadioButton(dialog_->radio_height_inch,
	                                  InsetGraphicsParams::INCH);
	heightButtons.registerRadioButton(dialog_->radio_height_percent_page,
	                                  InsetGraphicsParams::PERCENT_PAGE);

	// Add the widgets of the display radio buttons to their group
	displayButtons.reset();
	displayButtons.registerRadioButton(dialog_->radio_display_color,
	                                   InsetGraphicsParams::COLOR);
	displayButtons.registerRadioButton(dialog_->radio_display_grayscale,
	                                   InsetGraphicsParams::GRAYSCALE);
	displayButtons.registerRadioButton(dialog_->radio_display_monochrome,
	                                   InsetGraphicsParams::MONOCHROME);
	displayButtons.registerRadioButton(dialog_->radio_no_display,
	                                   InsetGraphicsParams::NONE);

        // Manage the ok, apply, restore and cancel/close buttons
	bc_.setOK(dialog_->button_ok);
	bc_.setApply(dialog_->button_apply);
	bc_.setCancel(dialog_->button_cancel);
	bc_.setUndoAll(dialog_->button_restore);
	bc_.refresh();

	bc_.addReadOnly(dialog_->input_filename);
	bc_.addReadOnly(dialog_->button_browse);
	bc_.addReadOnly(dialog_->input_width);
	bc_.addReadOnly(dialog_->input_height);
	bc_.addReadOnly(dialog_->radio_button_group_width);
	bc_.addReadOnly(dialog_->radio_button_group_height);
	bc_.addReadOnly(dialog_->radio_button_group_display);
	bc_.addReadOnly(dialog_->input_rotate_angle);
	bc_.addReadOnly(dialog_->check_inline);
	bc_.addReadOnly(dialog_->input_subcaption);
	bc_.addReadOnly(dialog_->check_subcaption);
}


FL_FORM * FormGraphics::form() const
{
	if (dialog_ ) return dialog_->form;
	return 0;
}


void FormGraphics::disconnect()
{
	inset_ = 0;
	FormInset::disconnect();
}


void FormGraphics::showDialog(InsetGraphics * inset)
{
	// If we are connected to another inset, disconnect.
	if (inset_)
		ih_.disconnect();

	inset_ = inset;

	ih_ = inset_->hide.connect(slot(this, &FormGraphics::hide));
	show();
}


void FormGraphics::apply()
{
	Assert(inset_ != 0);

	// Take all dialog details and insert them to the inset.

	// Create the parameters structure and fill the data from the dialog.
	InsetGraphicsParams igp;

	igp.filename = fl_get_input(dialog_->input_filename);

	igp.display = static_cast < InsetGraphicsParams::DisplayType >
	              (displayButtons.getButton());

	igp.widthResize = static_cast < InsetGraphicsParams::Resize >
	                  (widthButtons.getButton());
	igp.widthSize = strToDbl(fl_get_input(dialog_->input_width));

	igp.heightResize = static_cast < InsetGraphicsParams::Resize >
	                   (heightButtons.getButton());
	igp.heightSize = strToDbl(fl_get_input(dialog_->input_height));

	igp.rotateAngle = strToInt(fl_get_input(dialog_->input_rotate_angle));
	if (igp.rotateAngle >= 360)
		igp.rotateAngle = igp.rotateAngle % 360;
	if (igp.rotateAngle <= -360)
		igp.rotateAngle = - (( -igp.rotateAngle) % 360);

	igp.subcaption = fl_get_button(dialog_->check_subcaption);
	igp.subcaptionText = fl_get_input(dialog_->input_subcaption);

	igp.inlineFigure = fl_get_button(dialog_->check_inline);

	igp.testInvariant();

	// Set the parameters in the inset, it also returns true if the new
	// parameters are different from what was in the inset already.
	bool changed = inset_->setParams(igp);

	// Tell LyX we've got a change, and mark the document dirty, if it changed.
	lv_->view()->updateInset(inset_, changed);
}


void FormGraphics::update()
{
	Assert(inset_ != 0);

	// Update dialog with details from inset
	InsetGraphicsParams igp = inset_->getParams();

	// Update the filename input field
	fl_set_input(dialog_->input_filename,
	             igp.filename.c_str());

	// Update the display depth radio buttons
	displayButtons.setButton(igp.display);

	// Update the width radio buttons and input field
	widthButtons.setButton(igp.widthResize);
	fl_set_input(dialog_->input_width,
	             tostr(igp.widthSize).c_str());

	// Update the height radio buttons and input field
	heightButtons.setButton(igp.heightResize);
	fl_set_input(dialog_->input_height,
	             tostr(igp.heightSize).c_str());

	// Update the rotate angle
	fl_set_input(dialog_->input_rotate_angle,
	             tostr(igp.rotateAngle).c_str());

	// Update the subcaption check button and input field
	fl_set_button(dialog_->check_subcaption,
	              igp.subcaption);
	fl_set_input(dialog_->input_subcaption,
	             igp.subcaptionText.c_str());

	// Update the inline figure check button
	fl_set_button(dialog_->check_inline,
	              igp.inlineFigure);

	// update the dialog's read only / read-write status
	bc_.readOnly(lv_->buffer()->isReadonly());

	// Now make sure that the buttons are set correctly.
	input(0, 0);
}


bool FormGraphics::input(FL_OBJECT *, long data )
{
	State cb = static_cast<State>( data );

	bool inputOK = true;

	switch (cb) {
	case CHECKINPUT:
		inputOK = checkInput();
		break;
	case BROWSE:
		browse();
		break;
	case ADVANCEDINPUT:
		lyxerr << "Advanced Options button depressed, "
		       << "show advanced options dialog"
		       << endl;
		break;
	default:
		break;
	}
	
	return inputOK;
}


bool FormGraphics::checkInput()
{
	// Put verifications that the dialog shows some sane values,
	// if not disallow clicking on ok/apply.
	// Possibly use a label in the bottom of the dialog to give the reason.

	// Is all input boxes convey a valid meaning?
	bool inputOK = true;

	// Things that we check (meaning they are incorrect states):
	// 1. No filename specified.
	// 2. Width radio button is not Default and width text is not a number.
	// 3. Height radio button is not Default and height text is a not a number

	// Note: radio button default means that the user asks for the image
	// to be included as is with no size change, in this case we don't need
	// any width or height.

	// We verify now that there is a filename, it exists, it's a file
	// and it's readable.
	string filename = fl_get_input(dialog_->input_filename);
	FileInfo file(filename);
	if (filename.empty()
	        || !file.isOK()
	        || !file.exist()
	        || !file.isRegular()
	        || !file.readable()
	   )
		inputOK = false;

	// Width radio button not default and no number.
	if (!fl_get_button(dialog_->radio_width_default)
	        && strToDbl(fl_get_input(dialog_->input_width)) <= 0.0) {

		inputOK = false;
	}

	// Height radio button not default and no number.
	if (!fl_get_button(dialog_->radio_height_default)
	        && strToDbl(fl_get_input(dialog_->input_height)) <= 0.0) {

		inputOK = false;
	}

	return inputOK;
}


// We need these in the file browser.
extern string system_lyxdir;
extern string user_lyxdir;
//extern string system_tempdir;


// Need to move this to the form_graphics
string FormGraphics::browseFile(string const & filename)
{
	if (! filename.empty() )
		last_image_path = OnlyPath(filename);

	// Does user clipart directory exist?
	string bufclip = AddName (user_lyxdir, "clipart");
	FileInfo fileInfo(bufclip);
	if (!(fileInfo.isOK() && fileInfo.isDir()))
		// No - bail out to system clipart directory
		bufclip = AddName (system_lyxdir, "clipart");

	LyXFileDlg fileDlg;
	fileDlg.SetButton(0, _("Clipart"), bufclip);

	bool error = false;
	string buf;
	do {
		string p = fileDlg.Select(_("Graphics"),
		                          last_image_path,
		                          "*(ps|png)", filename);

		if (p.empty()) return p;

		last_image_path = OnlyPath(p);

		if (p.find_first_of("#~$% ") != string::npos) {
			WriteAlert(_("Filename can't contain any "
			             "of these characters:"),
			           // xgettext:no-c-format
			           _("space, '#', '~', '$' or '%'."));
			error = true;
		} else {
			error = false;
			buf = p;
		}
	} while (error);

	return buf;
}


void FormGraphics::browse()
{
	// Get the filename from the dialog
	string const filename = fl_get_input(dialog_->input_filename);

	// Show the file browser dialog
	string const new_filename = browseFile(filename);

	// Save the filename to the dialog
	if (new_filename != filename && ! new_filename.empty()) {
		fl_set_input(dialog_->input_filename,
		             new_filename.c_str());
		// The above set input doesn't cause an input event so we do
		// it manually. Otherwise the user needs to cause an input event
		// to get the ok/apply buttons to be activated.
		input(0, 0);
	}

}