// Copyright (c) 2005, Niels Martin Hansen
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
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//     this list of conditions and the following disclaimer.
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//     this list of conditions and the following disclaimer in the documentation
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// Aegisub Project http://www.aegisub.org/
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// $Id$

/// @file export_visible_lines.cpp
/// @brief Limit to Visible Lines export filter
/// @ingroup export
///


///////////
// Headers
#include "config.h"

#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_override.h"
#include "export_visible_lines.h"
#include "vfr.h"


/// @brief Constructor 
///
AssLimitToVisibleFilter::AssLimitToVisibleFilter() {
	initialized = false;
	frame = -1;
}



/// @brief Init 
/// @return 
///
void AssLimitToVisibleFilter::Init() {
	if (initialized) return;
	initialized = true;
	autoExporter = true;
	hidden = false;
	Register(_("Limit to Visible Lines"),1000000);
	description = _("Limit to Visible Lines");
}



/// @brief Process 
/// @param subs          
/// @param export_dialog 
/// @return 
///
void AssLimitToVisibleFilter::ProcessSubs(AssFile *subs, wxWindow *export_dialog) {
	// Nothing to do
	if (frame == -1) return;

	// Process
	using std::list;
	AssDialogue *diag;
	entryIter cur, next = subs->Line.begin();
	while (next != subs->Line.end()) {
		// Set next
		cur = next++;

		// Is dialogue?
		diag = AssEntry::GetAsDialogue(*cur);
		if (diag) {
			int f1 = VFR_Output.GetFrameAtTime(diag->Start.GetMS(),true);
			int f2 = VFR_Output.GetFrameAtTime(diag->End.GetMS(),false);

			// Invisible, remove frame
			if (f1 > frame || f2 < frame) {
				subs->Line.erase(cur);
			}
		}
	}
}



/// @brief Set limitation time 
/// @param _frame 
///
void AssLimitToVisibleFilter::SetFrame(int _frame) {
	instance.frame = _frame;
}



/// DOCME
AssLimitToVisibleFilter AssLimitToVisibleFilter::instance;