/*
 *  The Mana World
 *  Copyright 2004 The Mana World Development Team
 *
 *  This file is part of The Mana World.
 *
 *  The Mana World 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
 *  any later version.
 *
 *  The Mana World 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 The Mana World; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  $Id$
 */

#include "game.h"

#include <fstream>
#include <physfs.h>
#include <sstream>
#include <string>

#include <guichan/sdl/sdlinput.hpp>

#include "beingmanager.h"
#include "configuration.h"
#include "engine.h"
#include "flooritemmanager.h"
#include "graphics.h"
#include "joystick.h"
#include "localplayer.h"
#include "log.h"
#include "npc.h"

#include "gui/buy.h"
#include "gui/buysell.h"
#include "gui/chargedialog.h"
#include "gui/chat.h"
#include "gui/confirm_dialog.h"
#include "gui/equipmentwindow.h"
#include "gui/help.h"
#include "gui/inventorywindow.h"
#include "gui/minimap.h"
#include "gui/npclistdialog.h"
#include "gui/npc_text.h"
#include "gui/sell.h"
#include "gui/setup.h"
#include "gui/skill.h"
#include "gui/menuwindow.h"
#include "gui/status.h"
#include "gui/ministatus.h"
#include "gui/trade.h"
#include "gui/debugwindow.h"

#include "net/beinghandler.h"
#include "net/buysellhandler.h"
#include "net/chathandler.h"
#include "net/equipmenthandler.h"
#include "net/inventoryhandler.h"
#include "net/itemhandler.h"
#include "net/network.h"
#include "net/npchandler.h"
#include "net/playerhandler.h"
#include "net/skillhandler.h"
#include "net/tradehandler.h"

#include "resources/imagewriter.h"

extern Graphics *graphics;
extern gcn::SDLInput *guiInput;

class Map;

std::string map_path;

bool done = false;
volatile int tick_time;
volatile int fps = 0, frame = 0;
Engine *engine = NULL;
Joystick *joystick;

extern Window *weightNotice;
extern Window *deathNotice;
ConfirmDialog *exitConfirm = NULL;

ChatWindow *chatWindow;
MenuWindow *menuWindow;
StatusWindow *statusWindow;
MiniStatusWindow *miniStatusWindow;
BuyDialog *buyDialog;
SellDialog *sellDialog;
BuySellDialog *buySellDialog;
InventoryWindow *inventoryWindow;
NpcListDialog *npcListDialog;
NpcTextDialog *npcTextDialog;
SkillDialog *skillDialog;
//NewSkillDialog *newSkillWindow;
Setup* setupWindow;
Minimap *minimap;
EquipmentWindow *equipmentWindow;
ChargeDialog *chargeDialog;
TradeWindow *tradeWindow;
//BuddyWindow *buddyWindow;
HelpWindow *helpWindow;
DebugWindow *debugWindow;

BeingManager *beingManager = NULL;
FloorItemManager *floorItemManager = NULL;

const int MAX_TIME = 10000;

/**
 * Listener used for exitting handling.
 */
namespace {
    struct ExitListener : public gcn::ActionListener {
        void action(const std::string &eventId, gcn::Widget *widget) {
            if (eventId == "yes") {
                done = true;
            }
            exitConfirm = NULL;
        }
    } exitListener;
}

/**
 * Advances game logic counter.
 */
Uint32 nextTick(Uint32 interval, void *param)
{
    tick_time++;
    if (tick_time == MAX_TIME) tick_time = 0;
    return interval;
}

/**
 * Updates fps.
 */
Uint32 nextSecond(Uint32 interval, void *param)
{
    fps = frame;
    frame = 0;
    return interval;
}

int get_elapsed_time(int start_time)
{
    if (start_time <= tick_time) {
        return (tick_time - start_time) * 10;
    }
    else {
        return (tick_time + (MAX_TIME - start_time)) * 10;
    }
}

/**
 * Create all the various globally accessible gui windows
 */
void createGuiWindows(Network *network)
{
    // Create dialogs
    chatWindow = new ChatWindow(
    config.getValue("homeDir", "") + std::string("/chatlog.txt"), network);
    menuWindow = new MenuWindow();
    statusWindow = new StatusWindow(player_node);
    miniStatusWindow = new MiniStatusWindow();
    buyDialog = new BuyDialog(network);
    sellDialog = new SellDialog(network);
    buySellDialog = new BuySellDialog();
    inventoryWindow = new InventoryWindow();
    npcTextDialog = new NpcTextDialog();
    npcListDialog = new NpcListDialog();
    skillDialog = new SkillDialog();
    //newSkillWindow = new NewSkillDialog();
    setupWindow = new Setup();
    minimap = new Minimap();
    equipmentWindow = new EquipmentWindow(player_node->mEquipment.get());
    chargeDialog = new ChargeDialog();
    tradeWindow = new TradeWindow(network);
    //buddyWindow = new BuddyWindow();
    helpWindow = new HelpWindow();
    debugWindow = new DebugWindow();

    // Initialize window positions
    int screenW = graphics->getWidth();
    int screenH = graphics->getHeight();

    chargeDialog->setPosition(
            screenW - 5 - chargeDialog->getWidth(),
            screenH - chargeDialog->getHeight() - 15);
    tradeWindow->setPosition(screenW - statusWindow->getWidth() -
            tradeWindow->getWidth() - 10,
            inventoryWindow->getY() + inventoryWindow->getHeight());
    /*buddyWindow->setPosition(10,
      minimap->getHeight() + 30);*/

    // Set initial window visibility
    chatWindow->setVisible(true);
    miniStatusWindow->setVisible(true);
    statusWindow->setVisible(false);
    menuWindow->setVisible(true);
    buyDialog->setVisible(false);
    sellDialog->setVisible(false);
    buySellDialog->setVisible(false);
    inventoryWindow->setVisible(false);
    npcTextDialog->setVisible(false);
    npcListDialog->setVisible(false);
    skillDialog->setVisible(false);
    //newSkillWindow->setVisible(false);
    setupWindow->setVisible(false);
    equipmentWindow->setVisible(false);
    chargeDialog->setVisible(false);
    tradeWindow->setVisible(false);
    //buddyWindow->setVisible(false);
    helpWindow->setVisible(false);
    debugWindow->setVisible(false);
}

/**
 * Destroy all the globally accessible gui windows
 */
void destroyGuiWindows()
{
    delete chatWindow;
    delete statusWindow;
    delete miniStatusWindow;
    delete menuWindow;
    delete buyDialog;
    delete sellDialog;
    delete buySellDialog;
    delete inventoryWindow;
    delete npcListDialog;
    delete npcTextDialog;
    delete skillDialog;
    delete setupWindow;
    delete minimap;
    delete equipmentWindow;
    delete chargeDialog;
    //delete newSkillWindow;
    delete tradeWindow;
    //delete buddyWindow;
    delete helpWindow;
    delete debugWindow;
}

Game::Game(Network *network):
    mNetwork(network),
    mBeingHandler(new BeingHandler()),
    mBuySellHandler(new BuySellHandler()),
    mChatHandler(new ChatHandler()),
    mEquipmentHandler(new EquipmentHandler()),
    mInventoryHandler(new InventoryHandler()),
    mItemHandler(new ItemHandler()),
    mNpcHandler(new NPCHandler()),
    mPlayerHandler(new PlayerHandler()),
    mSkillHandler(new SkillHandler()),
    mTradeHandler(new TradeHandler())
{
    createGuiWindows(network);
    engine = new Engine(network);

    beingManager = new BeingManager(network);
    floorItemManager = new FloorItemManager();

    // Initialize timers
    tick_time = 0;
    SDL_AddTimer(10, nextTick, NULL);                     // Logic counter
    SDL_AddTimer(1000, nextSecond, NULL);                 // Seconds counter

    // Initialize beings
    beingManager->setPlayer(player_node);
    player_node->setNetwork(network);
    engine->changeMap(map_path);

    Joystick::init();
    // TODO: The user should be able to choose which one to use
    // Open the first device
    if (Joystick::getNumberOfJoysticks() > 0)
    {
        joystick = new Joystick(0);
    }

    network->registerHandler(mBeingHandler.get());
    network->registerHandler(mBuySellHandler.get());
    network->registerHandler(mChatHandler.get());
    network->registerHandler(mEquipmentHandler.get());
    network->registerHandler(mInventoryHandler.get());
    network->registerHandler(mItemHandler.get());
    network->registerHandler(mNpcHandler.get());
    network->registerHandler(mPlayerHandler.get());
    network->registerHandler(mSkillHandler.get());
    network->registerHandler(mTradeHandler.get());
}

Game::~Game()
{
    delete engine;
    delete player_node;
    destroyGuiWindows();

    delete beingManager;
    delete floorItemManager;
    delete joystick;

    beingManager = NULL;
    floorItemManager = NULL;
    joystick = NULL;
}

bool saveScreenshot(SDL_Surface *screenshot)
{
    static unsigned int screenshotCount = 0;

    // Search for an unused screenshot name
    std::stringstream filename;
    std::fstream testExists;
    bool found = false;

    do {
        screenshotCount++;
        filename.str("");
#if (defined __USE_UNIX98 || defined __FreeBSD__)
        filename << PHYSFS_getUserDir() << "/";
#endif
        filename << "TMW_Screenshot_" << screenshotCount << ".png";
        testExists.open(filename.str().c_str(), std::ios::in);
        found = !testExists.is_open();
        testExists.close();
    } while (!found);

    return ImageWriter::writePNG(screenshot, filename.str());
}

void Game::logic()
{
    int gameTime = tick_time;
    int drawTime = tick_time * 10;
    int delta = 0;
    int fpsLimit = 0;

    while (!done)
    {
        // Handle all necessary game logic
        while (get_elapsed_time(gameTime) > 0)
        {
            handleInput();
            engine->logic();
            gameTime++;
        }

        gameTime = tick_time;

        fpsLimit = (int)config.getValue("fpslimit", 50);
        if (fpsLimit)
        {
            delta = 1000 / fpsLimit;
        }
        else
        {
            delta = 0;
        }

        // Update the screen when application is active, delay otherwise
        if (SDL_GetAppState() & SDL_APPACTIVE)
        {
            if (abs(tick_time * 10 - drawTime) >= delta)
            {
                frame++;
                engine->draw(graphics);
                graphics->updateScreen();
                drawTime += delta;
            }
            else
            {
                SDL_Delay(10);
            }
        }
        else
        {
            SDL_Delay(10);
        }

        // Handle network stuff
        mNetwork->flush();
        mNetwork->dispatchMessages();
    }
}

void Game::handleInput()
{
    // Get the state of the keyboard keys
    Uint8* keys;
    keys = SDL_GetKeyState(NULL);

    if (joystick != NULL)
    {
        joystick->update();
    }

    // Events
    SDL_Event event;
    while (SDL_PollEvent(&event))
    {
        bool used = false;

        // Keyboard events (for discontinuous keys)
        if (event.type == SDL_KEYDOWN)
        {
            gcn::Window *requestedWindow = NULL;

            switch (event.key.keysym.sym)
            {
                case SDLK_F1:
                    // In-game Help
                    if (helpWindow->isVisible())
                    {
                        helpWindow->setVisible(false);
                    }
                    else
                    {
                        helpWindow->loadHelp("index");
                        helpWindow->requestMoveToTop();
                    }
                    used = true;
                    break;

                case SDLK_F2: requestedWindow = statusWindow; break;
                case SDLK_F3: requestedWindow = inventoryWindow; break;
                case SDLK_F4: requestedWindow = equipmentWindow; break;
                case SDLK_F5: requestedWindow = skillDialog; break;
                case SDLK_F6: requestedWindow = minimap; break;
                case SDLK_F7: requestedWindow = chatWindow; break;
                //case SDLK_F8: requestedWindow = buddyWindow; break;
                case SDLK_F9: requestedWindow = setupWindow; break;
                case SDLK_F10: requestedWindow = debugWindow; break;
                //case SDLK_F11: requestedWindow = newSkillWindow; break;

                case SDLK_RETURN:
                    // Input chat window
                    if (chatWindow->isFocused() ||
                        deathNotice != NULL ||
                        weightNotice != NULL)
                    {
                        break;
                    }

                    // Quit by pressing Enter if the exit confirm is there
                    if (exitConfirm)
                    {
                        done = true;
                    }
                    // Close the Browser if opened
                    else if (helpWindow->isVisible())
                    {
                        helpWindow->setVisible(false);
                    }
                    // Close the config window, cancelling changes if opened
                    else if (setupWindow->isVisible())
                    {
                        setupWindow->action("cancel", NULL);
                    }
                    // Else, open the chat edit box
                    else
                    {
                        chatWindow->requestChatFocus();
                        used = true;
                    }
                    break;

                    // Picking up items on the floor
                case SDLK_g:
                case SDLK_z:
                    if (!chatWindow->isFocused())
                    {
                        FloorItem *item = floorItemManager->findByCoordinates(
                                player_node->mX, player_node->mY);

                        // If none below the player, try the tile in front of
                        // the player
                        if (!item) {
                            Uint16 x = player_node->mX;
                            Uint16 y = player_node->mY;
                            if (player_node->mDirection & Being::UP)
                                y--;
                            if (player_node->mDirection & Being::DOWN)
                                y++;
                            if (player_node->mDirection & Being::LEFT)
                                x--;
                            if (player_node->mDirection & Being::RIGHT)
                                x++;

                            item = floorItemManager->findByCoordinates(x, y);
                        }

                        if (item)
                            player_node->pickUp(item);

                        used = true;
                    }
                    break;

                    // Quitting confirmation dialog
                case SDLK_ESCAPE:
                    if (!exitConfirm) {
                        exitConfirm = new ConfirmDialog(
                                "Quit", "Are you sure you want to quit?");
                        exitConfirm->addActionListener(&exitListener);
                    }
                    exitConfirm->requestMoveToTop();
                    break;

                default:
                    break;
            }

            if (requestedWindow)
            {
                requestedWindow->setVisible(!requestedWindow->isVisible());
                if (requestedWindow->isVisible())
                {
                    requestedWindow->requestMoveToTop();
                }
                used = true;
            }

            // Keys pressed together with Alt/Meta
            // Emotions and some internal gui windows
            if (event.key.keysym.mod & KMOD_ALT)
            {
                switch (event.key.keysym.sym)
                {
                    case SDLK_s:
                        // Player sit action
                        player_node->toggleSit();
                        used = true;
                        break;

                    case SDLK_p:
                        // Screenshot (picture, hence the p)
                        {
                            SDL_Surface *screenshot = graphics->getScreenshot();
                            if (!saveScreenshot(screenshot))
                            {
                                logger->log("Error: could not save Screenshot.");
                            }
                            SDL_FreeSurface(screenshot);
                        }
                        used = true;
                        break;

                    default:
                        break;

                    case SDLK_f:
                        // Find path to mouse (debug purpose)
                        engine->toggleDebugPath();
                        used = true;
                        break;
                }

                // Emotions
                Uint8 emotion;
                switch (event.key.keysym.sym)
                {
                    case SDLK_1: emotion = 1; break;
                    case SDLK_2: emotion = 2; break;
                    case SDLK_3: emotion = 3; break;
                    case SDLK_4: emotion = 4; break;
                    case SDLK_5: emotion = 5; break;
                    case SDLK_6: emotion = 6; break;
                    case SDLK_7: emotion = 7; break;
                    case SDLK_8: emotion = 8; break;
                    case SDLK_9: emotion = 9; break;
                    case SDLK_0: emotion = 10; break;
                    default: emotion = 0; break;
                }

                if (emotion)
                {
                    player_node->emote(emotion);
                    used = true;
                }
            }
        }

        // Quit event
        else if (event.type == SDL_QUIT)
        {
            done = true;
        }

        // Push input to GUI when not used
        if (!used) {
            guiInput->pushInput(event);
        }

    } // End while

    // Moving player around
    if (player_node->mAction != Being::DEAD &&
        current_npc == 0 &&
        !chatWindow->isFocused())
    {
        Uint16 x = player_node->mX;
        Uint16 y = player_node->mY;
        unsigned char Direction = 0;

        // Translate pressed keys to movement and direction
        if (keys[SDLK_UP] || keys[SDLK_KP8] ||
                keys[SDLK_KP7] || keys[SDLK_KP9] ||
                joystick && joystick->isUp())
        {
            Direction |= Being::UP;
        }
        else if (keys[SDLK_DOWN] || keys[SDLK_KP2] ||
                keys[SDLK_KP1] || keys[SDLK_KP3] ||
                joystick && joystick->isDown())
        {
            Direction |= Being::DOWN;
        }
        if (keys[SDLK_LEFT] || keys[SDLK_KP4] ||
                keys[SDLK_KP1] || keys[SDLK_KP7] ||
                joystick && joystick->isLeft())
        {
            Direction |= Being::LEFT;
        }
        else if (keys[SDLK_RIGHT] || keys[SDLK_KP6] ||
                keys[SDLK_KP3] || keys[SDLK_KP9] ||
                joystick && joystick->isRight())
        {
            Direction |= Being::RIGHT;
        }

        player_node->walk(Direction);

        // Attacking monsters
        if (keys[SDLK_LCTRL] || keys[SDLK_RCTRL] ||
                joystick && joystick->buttonPressed(0))
        {
            Being *target = NULL;
            bool newTarget = keys[SDLK_LSHIFT] || keys[SDLK_RSHIFT];

            // A set target has highest priority
            if (newTarget || !player_node->getTarget())
            {
                Uint16 targetX = x, targetY = y;

                if (player_node->mDirection & Being::UP)
                    targetY--;
                if (player_node->mDirection & Being::DOWN)
                    targetY++;
                if (player_node->mDirection & Being::LEFT)
                    targetX--;
                if (player_node->mDirection & Being::RIGHT)
                    targetX++;

                // Attack priorioty is: Monster, Player, auto target
                target = beingManager->findBeing(
                        targetX, targetY, Being::MONSTER);
                if (!target)
                    target = beingManager->findBeing(
                            targetX, targetY, Being::PLAYER);
            }

            player_node->attack(target, newTarget);
        }

        if (joystick)
        {
            if (joystick->buttonPressed(1))
            {
                FloorItem *item = floorItemManager->findByCoordinates(
                        player_node->mX, player_node->mY);

                if (item)
                    player_node->pickUp(item);
            }
            else if (joystick->buttonPressed(2))
            {
                player_node->toggleSit();
            }
        }
    }
}