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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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        std::string scouts[SCOUTSIM_NUM_SCOUTS] = 
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        {
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            "scout.png"
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        };
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        std::string images_path = ros::package::getPath("scoutsim")+"/images/";
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        for (size_t i = 0; i < SCOUTSIM_NUM_SCOUTS; ++i)
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        {
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            scout_images[i].LoadFile(
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                wxString::FromAscii((images_path + scouts[i]).c_str()));
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            scout_images[i].SetMask(true);
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            scout_images[i].SetMaskColour(255, 255, 255);
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        }
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        /// @todo This should change.
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        meter = scout_images[0].GetHeight();
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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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        display_map_name = map_base_name;
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        wxBitmap lines_bitmap;
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        lines_bitmap.LoadFile(wxString::FromAscii(map_lines_name.c_str()));
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        lines_image = lines_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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        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_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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        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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        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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        spawnScout("", width_in_meters / 2.0, height_in_meters / 2.0, 0);
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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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        ScoutPtr t(new Scout(ros::NodeHandle(real_name),
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                   scout_images[rand() % SCOUTSIM_NUM_SCOUTS],
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                   Vector2(x, y), 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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    {
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        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::showMap(wxCommandEvent& WXUNUSED(event))
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    {
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        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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    void SimFrame::clear()
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    {
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        path_dc.SetBackground(wxBrush(wxColour(100, 100, 100)));
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        path_dc.Clear();
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        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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    void SimFrame::onUpdate(wxTimerEvent& evt)
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    {
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        ros::spinOnce();
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        updateScouts();
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        if (!ros::ok())
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        {
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            Close();
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        }
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    }
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    void SimFrame::onPaint(wxPaintEvent& evt)
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    {
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        wxPaintDC dc(this);
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        dc.DrawBitmap(path_bitmap, 0, 0, true);
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        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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    void SimFrame::updateScouts()
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    {
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        if (last_scout_update.isZero())
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        {
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            last_scout_update = ros::WallTime::now();
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            return;
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        }
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        if (frame_count % 3 == 0)
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        {
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            path_image = path_bitmap.ConvertToImage();
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            Refresh();
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        }
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        M_Scout::iterator it = scouts.begin();
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        M_Scout::iterator end = scouts.end();
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        world_state state;
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        state.canvas_width = width_in_meters;
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        state.canvas_height = height_in_meters;
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        for (; it != end; ++it)
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        {
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            it->second->update(0.016, path_dc, path_image, lines_image,
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                               path_dc.GetBackground().GetColour(),
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                               state);
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        }
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        frame_count++;
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    }
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    bool SimFrame::clearCallback(std_srvs::Empty::Request&,
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                                 std_srvs::Empty::Response&)
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    {
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        ROS_INFO("Clearing scoutsim.");
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        clear();
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        return true;
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    }
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    bool SimFrame::resetCallback(std_srvs::Empty::Request&,
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                                 std_srvs::Empty::Response&)
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    {
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        ROS_INFO("Resetting scoutsim.");
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        scouts.clear();
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        id_counter = 0;
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        spawnScout("", width_in_meters / 2.0, height_in_meters / 2.0, 0);
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        clear();
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        return true;
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    }
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}