#pragma once

#include "../../Include/RmlUi/Core/EventListener.h"
#include "../../Include/RmlUi/Core/Plugin.h"

namespace Rml {

class ElementDocument;
class SystemInterface;

namespace Debugger {

class ElementLog;
class ElementInfo;
class ElementContextHook;
class ElementDataModels;
class DebuggerSystemInterface;

/**
    RmlUi plugin interface for the debugger.
 */

class DebuggerPlugin : public Rml::Plugin, public Rml::EventListener {
public:
	DebuggerPlugin();
	~DebuggerPlugin();

	/// Initialises the debugging tools into the given context.
	/// @param[in] context The context to load the tools into.
	/// @return True on success, false if an error occured.
	bool Initialise(Context* context);

	/// Sets the context to be debugged.
	/// @param[in] context The context to be debugged.
	/// @return True if the debugger is initialised and the context was switched, false otherwise.
	bool SetContext(Context* context);

	/// Sets the visibility of the debugger.
	/// @param[in] visibility True to show the debugger, false to hide it.
	void SetVisible(bool visibility);
	/// Returns the visibility of the debugger.
	/// @return True if the debugger is visible, false if not.
	bool IsVisible();

	/// Renders any debug elements in the debug context.
	void Render();

	/// Called when RmlUi shuts down.
	void OnShutdown() override;

	/// Called whenever a RmlUi context is destroyed.
	/// @param[in] context The destroyed context.
	void OnContextDestroy(Context* context) override;

	/// Called whenever an element is destroyed.
	/// @param[in] element The destroyed element.
	void OnElementDestroy(Element* element) override;

	/// Event handler for events from the debugger elements.
	/// @param[in] event The event to process.
	void ProcessEvent(Event& event) override;

	/// Access the singleton instance of the debugger
	/// @return nullptr or an instance of the plugin
	static DebuggerPlugin* GetInstance();

private:
	bool LoadFont();
	bool LoadMenuElement();
	bool LoadInfoElement();
	bool LoadLogElement();
	bool LoadDataExplorerElement();

	void SetupInfoListeners(Rml::Context* new_context);

	// Release all loaded elements
	void ReleaseElements();

	// The context hosting the debug documents.
	Context* host_context;
	// The context we're debugging.
	Context* debug_context;

	// The debug elements.
	ElementDocument* menu_element;
	ElementInfo* info_element;
	ElementLog* log_element;
	ElementDataModels* data_explorer_element;
	ElementContextHook* hook_element;

	Rml::SystemInterface* application_interface;
	UniquePtr<DebuggerSystemInterface> log_interface;

	UniquePtr<ElementInstancer> hook_element_instancer, debug_document_instancer, info_element_instancer, log_element_instancer,
		data_explorer_element_instancer;

	bool render_outlines;

	// Singleton instance
	static DebuggerPlugin* instance;
};

} // namespace Debugger
} // namespace Rml