/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef __TOOL_MANAGER_H
#define __TOOL_MANAGER_H

#include <cstdio>
#include <map>
#include <vector>
#include <deque>

#include <boost/unordered_map.hpp>

#include <math/vector2d.h>

#include <tool/tool_event.h>
#include <tool/tool_base.h>

class TOOL_BASE;
class CONTEXT_MENU;
class wxWindow;

/**
 * Class TOOL_MANAGER.
 * Master controller class:
 * - registers editing tools
 * - pumps UI events to tools requesting them
 * - manages tool state machines (transitions and wait requests)
 */
class TOOL_MANAGER
{
public:
    TOOL_MANAGER();
    ~TOOL_MANAGER();

    /**
     * Generates an unique ID from for a tool with given name.
     */
    static TOOL_ID MakeToolId( const std::string& aToolName );

    /**
     * Function RegisterTool()
     * Adds a tool to the manager set and sets it up. Called once for
     * each tool during application initialization.
     * @param aTool: tool to be added. Ownership is transferred.
     */
    void RegisterTool( TOOL_BASE* aTool );

    /**
     * Function InvokeTool()
     * Calls a tool by sending a tool activation event to tool of given ID or name.
     * An user-defined parameter object can be also passed
     */
    void InvokeTool( TOOL_ID aToolId );
    void InvokeTool( const std::string& name );

    template <class Parameters>
        void InvokeTool( const std::string& name, const Parameters& aToolParams );


    /**
     * Function FindTool()
     * Searches for a tool with given name or ID
     */
    TOOL_BASE *FindTool( int aId );
    TOOL_BASE *FindTool( const std::string& aName );

    /**
     * Resets the state of a given tool by clearing its wait and
     * transition lists and calling tool's internal Reset() method.
     */
    void ResetTool( TOOL_BASE *aTool );

    /**
     * Takes an event from the TOOL_DISPATCHER and propagates it to
     * tools that requested events of matching type(s)
     */
    bool ProcessEvent( TOOL_EVENT& aEvent );

    /**
     * Sets the work environment (model, view, view controls and the parent window).
     * These are made available to the tool. Called by the parent frame (PCB_EDIT_FRAME)
     * when the board is set up
     */
    void SetEnvironment( EDA_ITEM* aModel, KiGfx::VIEW* aView,
                         KiGfx::VIEW_CONTROLS* aViewControls, wxWindow* aFrame );

    /* Accessors for the environment objects (view, model, etc.) */
    KiGfx::VIEW* GetView()
    {
        return m_view;
    }

    KiGfx::VIEW_CONTROLS* GetViewControls()
    {
        return m_viewControls;
    }

    EDA_ITEM* GetModel()
    {
        return m_model;
    }

    wxWindow* GetEditFrame()
    {
        return m_editFrame;
    }

    /**
     * Defines a state transition - the events that cause a given handler method in the tool
     * to be called. Called by TOOL_INTERACTIVE::Go(). May be called from a coroutine context.
     */
    void ScheduleNextState( TOOL_BASE* aTool, TOOL_STATE_FUNC& aHandler,
                            const TOOL_EVENT_LIST& aConditions );

    /**
     * Pauses execution of a given tool until one or more events matching aConditions arrives.
     * The pause/resume operation is done through COROUTINE object.
     * Called only from coroutines.
     */
    boost::optional<TOOL_EVENT> ScheduleWait( TOOL_BASE* aTool,
                                              const TOOL_EVENT_LIST& aConditions );

    /**
     * Sets behaviour of the tool's context popup menu.
     * @param aMenu - the menu structure, defined by the tool
     * @param aTrigger - when the menu is activated:
     * CMENU_NOW: opens the menu right now
     * CMENU_BUTTON: opens the menu when RMB is pressed
     * CMENU_OFF: menu is disabled.
     * May be called from a coroutine context.
     */
    void ScheduleContextMenu( TOOL_BASE* aTool, CONTEXT_MENU* aMenu,
                              TOOL_ContextMenuTrigger aTrigger );

private:
    void dispatchInternal( TOOL_EVENT& aEvent );

    struct ToolState;
    typedef std::pair<TOOL_EVENT_LIST, TOOL_STATE_FUNC> Transition;

    std::map<TOOL_BASE*, ToolState*> m_toolState;
    std::map<std::string, ToolState*> m_toolNameIndex;
    std::map<TOOL_ID, ToolState*> m_toolIdIndex;

    EDA_ITEM* m_model;
    KiGfx::VIEW* m_view;
    KiGfx::VIEW_CONTROLS* m_viewControls;
    wxWindow* m_editFrame;

    ToolState* m_currentTool;
};

#endif