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/**
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 * The code in this package was developed using the structure of Willow
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 * Garage's turtlesim package.  It was modified by the CMU Robotics Club
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 * to be used as a simulator for the Colony Scout robot.
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 *
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 * All redistribution of this code is limited to the terms of Willow Garage's
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 * licensing terms, as well as under permission from the CMU Robotics Club.
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 * 
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 * Copyright (c) 2011 Colony Project
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 * 
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 * Permission is hereby granted, free of charge, to any person
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 * obtaining a copy of this software and associated documentation
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 * files (the "Software"), to deal in the Software without
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 * restriction, including without limitation the rights to use,
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 * copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following
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 * conditions:
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 * 
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 * The above copyright notice and this permission notice shall be
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 * included in all copies or substantial portions of the Software.
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 * 
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 * Copyright (c) 2009, Willow Garage, Inc.
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 * All rights reserved.
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 * 
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 * 
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 *    Redistributions of source code must retain the above copyright
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 *       notice, this list of conditions and the following disclaimer.
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 *    Redistributions in binary form must reproduce the above copyright
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 *       notice, this list of conditions and the following disclaimer in the
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 *       documentation and/or other materials provided with the distribution.
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 *    Neither the name of the Willow Garage, Inc. nor the names of its
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 *       contributors may be used to endorse or promote products derived from
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 *       this software without specific prior written permission.
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 * 
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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 * OTHER DEALINGS IN THE SOFTWARE.
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 */
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#include "sim_frame.h"
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#include <stdio.h>
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#include <ros/package.h>
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#include <cstdlib>
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#include <ctime>
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using namespace std;
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namespace scoutsim
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{
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    SimFrame::SimFrame(wxWindow* parent, string map_name)
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        : wxFrame(parent, wxID_ANY, wxT("ScoutSim"), wxDefaultPosition,
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                  wxSize(500, 500), wxDEFAULT_FRAME_STYLE & ~wxRESIZE_BORDER)
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          , frame_count(0)
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          , id_counter(0)
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    {
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        std::cout << "Constructing sim frame." << std::endl;
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        srand(time(NULL));
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        update_timer = new wxTimer(this);
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        update_timer->Start(16);
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        Connect(update_timer->GetId(), wxEVT_TIMER,
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                wxTimerEventHandler(SimFrame::onUpdate), NULL, this);
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        Connect(wxEVT_PAINT, wxPaintEventHandler(SimFrame::onPaint),
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                NULL, this);
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        images_path = ros::package::getPath("scoutsim") + "/images/";
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        // 200 pixels per meter. @todo make this a constant elsewhere.
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        meter = 200;
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        map_base_name =  ros::package::getPath("scoutsim") + "/maps/" +
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                           map_name + ".bmp";
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        map_lines_name = ros::package::getPath("scoutsim") + "/maps/" +
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                           map_name + "_lines.bmp";
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        map_walls_name = ros::package::getPath("scoutsim") + "/maps/" +
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                           map_name + "_walls.bmp";
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        display_map_name = map_base_name;
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        wxBitmap lines_bitmap;
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        wxBitmap walls_bitmap;
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        path_bitmap.LoadFile(wxString::FromAscii(display_map_name.c_str()));
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        sonar_on = TRUE;
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        // Try to load the file; if it fails, make a new blank file
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        if (!lines_bitmap.LoadFile(wxString::FromAscii(map_lines_name.c_str())))
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        {
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            lines_bitmap = wxBitmap(path_bitmap.GetWidth(), path_bitmap.GetHeight(), 3);
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        }
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        lines_image = lines_bitmap.ConvertToImage();
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        // Try to load the file; if it fails, make a new blank file
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        if (!walls_bitmap.LoadFile(wxString::FromAscii(map_walls_name.c_str())))
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        {
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            walls_bitmap = wxBitmap(path_bitmap.GetWidth(), path_bitmap.GetHeight(), 3);
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        }
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        walls_image = walls_bitmap.ConvertToImage();
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        clear();
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        clear_srv = nh.advertiseService("clear",
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                                        &SimFrame::clearCallback, this);
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        reset_srv = nh.advertiseService("reset",
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                                        &SimFrame::resetCallback, this);
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        spawn_srv = nh.advertiseService("spawn",
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                                        &SimFrame::spawnCallback, this);
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        kill_srv = nh.advertiseService("kill",
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                                       &SimFrame::killCallback, this);
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        // Subscribe and publisher wirless from robots
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        wireless_receive = nh.advertise< ::messages::WirelessPacket>(
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            "/wireless/receive", 1000); 
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        wireless_send = nh.subscribe("/wireless/send", 1000,
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            &SimFrame::wirelessCallback, this);
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        // Teleop
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        teleop_type = TELEOP_OFF;
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        teleop_l_speed = 0;
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        teleop_r_speed = 0;
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        teleop_pub = nh.advertise<motors::set_motors>("/scout1/set_motors", 1000);
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        ROS_INFO("Starting scoutsim with node name %s",
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                 ros::this_node::getName().c_str()) ;
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        wxMenu *menuFile = new wxMenu;
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        menuFile->Append(ID_ABOUT, _("&About"));
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        menuFile->AppendSeparator();
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        menuFile->Append(ID_QUIT, _("E&xit"));
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        wxMenu *menuSim = new wxMenu;
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        menuSim->Append(ID_SONAR, _("S&onar"));
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        menuSim->Append(ID_CLEAR, _("&Clear"));
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        wxMenu *menuView = new wxMenu;
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        menuView->Append(ID_MAP, _("&Map"));
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        menuView->Append(ID_LINES, _("&Lines"));
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        menuView->Append(ID_WALLS, _("&Walls"));
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        wxMenu *menuTeleop = new wxMenu;
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        menuTeleop->Append(ID_TELEOP_NONE, _("&None"));
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        menuTeleop->Append(ID_TELEOP_PRECISE, _("&Precise"));
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        menuTeleop->Append(ID_TELEOP_FLUID, _("&Fluid"));
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        wxMenuBar *menuBar = new wxMenuBar;
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        menuBar->Append(menuFile, _("&File"));
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        menuBar->Append(menuSim, _("&Sim"));
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        menuBar->Append(menuView, _("&View"));
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        menuBar->Append(menuTeleop, _("&Teleop"));
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        SetMenuBar(menuBar);
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        width_in_meters = GetSize().GetWidth() / meter;
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        height_in_meters = GetSize().GetHeight() / meter;
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    }
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    SimFrame::~SimFrame()
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    {
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        delete update_timer;
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    }
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    bool SimFrame::spawnCallback(scoutsim::Spawn::Request  &req,
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                                 scoutsim::Spawn::Response &res)
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    {
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        std::string name = spawnScout(req.name, req.x, req.y, req.theta);
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        if (name.empty())
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        {
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            ROS_ERROR("A scout named [%s] already exists", req.name.c_str());
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            return false;
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        }
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        res.name = name;
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        return true;
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    }
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    bool SimFrame::killCallback(scoutsim::Kill::Request& req,
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                                scoutsim::Kill::Response&)
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    {
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        M_Scout::iterator it = scouts.find(req.name);
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        if (it == scouts.end())
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        {
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            ROS_ERROR("Tried to kill scout [%s], which does not exist",
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                      req.name.c_str());
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            return false;
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        }
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        scouts.erase(it);
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        return true;
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    }
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    bool SimFrame::hasScout(const std::string& name)
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    {
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        return scouts.find(name) != scouts.end();
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    }
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    std::string SimFrame::spawnScout(const std::string& name,
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                                     float x, float y, float angle)
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    {
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        std::string real_name = name;
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        if (real_name.empty())
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        {
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            do
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            {
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                std::stringstream ss;
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                ss << "scout" << ++id_counter;
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                real_name = ss.str();
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            } while (hasScout(real_name));
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        }
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        else
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        {
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            if (hasScout(real_name))
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            {
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                return "";
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            }
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        }
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        wxImage scout_image;
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        // Try to load a name-specific image; if not, load the default scout
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        string specific_name = images_path + name + ".png";
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        if (fileExists(specific_name))
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        {
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            scout_image.LoadFile(wxString::FromAscii(specific_name.c_str()));
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            scout_image.SetMask(true);
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            scout_image.SetMaskColour(255, 255, 255);
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        }
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        else
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        {
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            scout_image.LoadFile(
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                wxString::FromAscii((images_path + "scout.png").c_str()));
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            scout_image.SetMask(true);
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            scout_image.SetMaskColour(255, 255, 255);
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        }
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        ScoutPtr t(new Scout(ros::NodeHandle(real_name),
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                   scout_image, Vector2(x, y), &path_bitmap, angle));
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        scouts[real_name] = t;
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        ROS_INFO("Spawning scout [%s] at x=[%f], y=[%f], theta=[%f]",
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                 real_name.c_str(), x, y, angle);
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        return real_name;
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    }
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    void SimFrame::onQuit(wxCommandEvent& WXUNUSED(event))
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    {
259
        Close(true);
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    }
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    void SimFrame::onAbout(wxCommandEvent& WXUNUSED(event))
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    {
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        wxMessageBox(_("Scoutsim is the simulator the Colony Project's scout robot.\n"
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                       "\nThe Colony Project is a part of the Carnegie Mellon\n"
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                       "Robotics Club. Our goal is to use cooperative low-cost\n"
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                       "robots to solve challenging problems."),
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                     _("About Scoutsim"),
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                     wxOK | wxICON_INFORMATION, this );
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    }
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    void SimFrame::onClear(wxCommandEvent& WXUNUSED(event))
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    {
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        clear();
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    }
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    void SimFrame::showSonar(wxCommandEvent& WXUNUSED(event))
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    {
279
        sonar_on = not sonar_on;
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        clear();
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    }
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    void SimFrame::showMap(wxCommandEvent& WXUNUSED(event))
285
    {
286
        display_map_name = map_base_name;
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        clear();
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    }
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    void SimFrame::showLines(wxCommandEvent& WXUNUSED(event))
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    {
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        display_map_name = map_lines_name;
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        clear();
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    }
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296
    void SimFrame::showWalls(wxCommandEvent& WXUNUSED(event))
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    {
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        display_map_name = map_walls_name;
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        clear();
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    }
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    void SimFrame::clear()
303
    {
304
        path_dc.SetBackground(wxBrush(wxColour(100, 100, 100)));
305
        path_dc.Clear();
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307
        sonar_dc.SetBackground(wxBrush(wxColour(255, 0, 0)));
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        sonar_dc.Clear();
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310
        sonar_dc.SelectObject(path_bitmap);
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312
        path_bitmap.LoadFile(wxString::FromAscii(display_map_name.c_str()));
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        path_dc.SelectObject(path_bitmap);
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        SetSize(wxSize(path_bitmap.GetWidth(), path_bitmap.GetHeight()));
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    }
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317
    void SimFrame::onUpdate(wxTimerEvent& evt)
318
    {
319
        ros::spinOnce();
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321
        teleop();
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323
        updateScouts();
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325
        if (!ros::ok())
326
        {
327
            Close();
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        }
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    }
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331
    void SimFrame::onPaint(wxPaintEvent& evt)
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    {
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        wxPaintDC dc(this);
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335
        dc.DrawBitmap(path_bitmap, 0, 0, true);
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337
        M_Scout::iterator it = scouts.begin();
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        M_Scout::iterator end = scouts.end();
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        for (; it != end; ++it)
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        {
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            it->second->paint(dc);
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        }
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    }
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    bool SimFrame::fileExists(const std::string& filename)
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    {
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        struct stat buf;
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        if (stat(filename.c_str(), &buf) != -1)
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        {
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            return true;
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        }
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        return false;
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    }
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    void SimFrame::stopTeleop(wxCommandEvent& event)
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    {
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        teleop_type = TELEOP_OFF;
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        teleop_l_speed = 0;
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        teleop_r_speed = 0;
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    }
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    void SimFrame::startTeleopPrecise(wxCommandEvent& event)
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    {
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        teleop_type = TELEOP_PRECISE;
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        teleop_l_speed = 0;
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        teleop_r_speed = 0;
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    }
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369
    void SimFrame::startTeleopFluid(wxCommandEvent& event)
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    {
371
        teleop_type = TELEOP_FLUID;
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        teleop_l_speed = 0;
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        teleop_r_speed = 0;
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        teleop_fluid_speed = 0;
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        teleop_fluid_omega = 0;
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    }
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    void SimFrame::teleop_move_precise()
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    {
380
        // Default to stop
381
        teleop_l_speed = 0;
382
        teleop_r_speed = 0;
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384
        if (wxGetKeyState(WXK_UP))
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        {
386
            teleop_l_speed = TELEOP_PRECISE_SPEED;
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            teleop_r_speed = TELEOP_PRECISE_SPEED;
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        }
389
        else if (wxGetKeyState(WXK_DOWN))
390
        {
391
            teleop_l_speed = -TELEOP_PRECISE_SPEED;
392
            teleop_r_speed = -TELEOP_PRECISE_SPEED;
393
        }
394
        else if (wxGetKeyState(WXK_LEFT))
395
        {
396
            teleop_l_speed = -TELEOP_PRECISE_SPEED;
397
            teleop_r_speed = TELEOP_PRECISE_SPEED;
398
        }
399
        else if (wxGetKeyState(WXK_RIGHT))
400
        {
401
            teleop_l_speed = TELEOP_PRECISE_SPEED;
402
            teleop_r_speed = -TELEOP_PRECISE_SPEED;
403
        }
404
    }
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406
    void SimFrame::teleop_move_fluid()
407
    {
408
        if (wxGetKeyState(WXK_UP))
409
        {
410
            teleop_fluid_speed += 2;
411
        }
412
        else if (wxGetKeyState(WXK_DOWN))
413
        {
414
            teleop_fluid_speed -= 2;
415
        }
416
        else if (teleop_fluid_speed > 0)
417
        {
418
            teleop_fluid_speed -= 1;
419
        }
420
        else if (teleop_fluid_speed < 0)
421
        {
422
            teleop_fluid_speed += 1;
423
        }
424

    
425
        if (wxGetKeyState(WXK_LEFT))
426
        {
427
            teleop_fluid_omega -= 1;
428
        }
429
        else if (wxGetKeyState(WXK_RIGHT))
430
        {
431
            teleop_fluid_omega += 1;
432
        }
433
        else
434
        {
435
            teleop_fluid_omega = 0;
436
        }
437

    
438
        if (teleop_fluid_speed > TELEOP_FLUID_MAX_SPEED)
439
        {
440
            teleop_fluid_speed = TELEOP_FLUID_MAX_SPEED;
441
        }
442
        if (teleop_fluid_omega > TELEOP_FLUID_MAX_SPEED / 2)
443
        {
444
            teleop_fluid_omega = TELEOP_FLUID_MAX_SPEED / 2;
445
        }
446

    
447
        teleop_l_speed = teleop_fluid_speed + teleop_fluid_omega;
448
        teleop_r_speed = teleop_fluid_speed - teleop_fluid_omega;
449
    }
450

    
451
    void SimFrame::teleop()
452
    {
453
        switch (teleop_type)
454
        {
455
            case TELEOP_OFF:
456
                return;
457
            case TELEOP_PRECISE:
458
                teleop_move_precise();
459
                break;
460
            case TELEOP_FLUID:
461
                teleop_move_fluid();
462
                break;
463
        }
464

    
465
        motors::set_motors msg;
466
        msg.fl_set = true;
467
        msg.fr_set = true;
468
        msg.bl_set = true;
469
        msg.br_set = true;
470

    
471
        msg.fl_speed = teleop_l_speed;
472
        msg.fr_speed = teleop_r_speed;
473
        msg.bl_speed = teleop_l_speed;
474
        msg.br_speed = teleop_r_speed;
475

    
476
        teleop_pub.publish(msg);
477
    }
478

    
479
    void SimFrame::updateScouts()
480
    {
481
        if (last_scout_update.isZero())
482
        {
483
            last_scout_update = ros::WallTime::now();
484
            return;
485
        }
486

    
487
        if (frame_count % 3 == 0)
488
        {
489
            path_image = path_bitmap.ConvertToImage();
490
            Refresh();
491
        }
492

    
493
        M_Scout::iterator it = scouts.begin();
494
        M_Scout::iterator end = scouts.end();
495

    
496
        world_state state;
497
        state.canvas_width = width_in_meters;
498
        state.canvas_height = height_in_meters;
499

    
500
        for (; it != end; ++it)
501
        {
502
            it->second->update(0.016, path_dc,sonar_dc,sonar_on,
503
                               path_image, lines_image, walls_image,
504
                               path_dc.GetBackground().GetColour(),
505
                               sonar_dc.GetBackground().GetColour(),
506
                               state);
507
        }
508

    
509
        frame_count++;
510
    }
511

    
512
    bool SimFrame::clearCallback(std_srvs::Empty::Request&,
513
                                 std_srvs::Empty::Response&)
514
    {
515
        ROS_INFO("Clearing scoutsim.");
516
        clear();
517
        return true;
518
    }
519

    
520
    bool SimFrame::resetCallback(std_srvs::Empty::Request&,
521
                                 std_srvs::Empty::Response&)
522
    {
523
        ROS_INFO("Resetting scoutsim.");
524
        scouts.clear();
525
        id_counter = 0;
526
        spawnScout("", width_in_meters / 2.0, height_in_meters / 2.0, 0);
527
        clear();
528
        return true;
529
    }
530

    
531
    void SimFrame::wirelessCallback(const ::messages::WirelessPacket::ConstPtr& msg)
532
    {
533
        wireless_receive.publish(msg);
534
    }
535
}