/*
   $Id: adonthell.cc,v 1.11 2003/01/17 22:05:56 ksterker Exp $

   Copyright (C) 1999/2000/2001 Alexandre Courbot
   Part of the Adonthell Project http://adonthell.linuxgames.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/


/** 
 * @file adonthell.cc
 *
 * @author Alexandre Courbot
 * @author Kai Sterker
 * @brief Implements the adonthell class.
 */

#include "win_manager.h"
#include "gametime.h"
#include "gamedate.h"
#include "adonthell.h"
#include "audio.h"

// Pointer to the active main loop
adonthell *data::engine = NULL; 

// constructor
adonthell::adonthell ()
{
    letsexit = false;
    update_map_ = false;
    control_active_ = false;
    
    // load the script taking care of additional game commands
    control.create_instance ("schedules.control", "control");
}

// start and execute the game's main loop 
void adonthell::main (win_base *wnd, const string name)
{
    win_manager mgr;
    
    if (wnd != NULL)
    {
        mgr.add (wnd /*, name */);
        mgr.set_focus (wnd);       
    }
    else
    {
        mapview_start ();
        set_control_active (true);
        fade_in ();
    }

    while (letsexit == false)
    {
        main_loop ();
    
        // blit the surface to the physical screen
        screen::show ();
    
        // perform operations to keep the game's speed constant
        gametime::update ();
        
        // update the internal clock
        gamedate::update ();
    }

    // only leave one main loop at a time
    letsexit = false;    
}

// the main loop
void adonthell::main_loop ()
{
    input::update ();

    // check whether music has finished playing
    if (audio::is_background_finished ()) audio::run_schedule ();

    // on slower machines, we update several times before drawing,
    // i.e. we are skipping frames to keep the game's speed constant
    for (int i = 0; i < gametime::frames_to_skip (); i++)
    {
        // grab any user input and update the internal state of
        // all windows of the current level
        win_manager::active->input_update ();
        if (update_map ()) lmap.update ();
        win_manager::active->update ();
        if (control_active ()) control.run ();
    }
   
    if (!letsexit) 
    {
        // first clear the screen to avoid artifacts
        screen::clear ();
    
        // draw everything to our display surface
        win_manager::active->draw ();
    }
}

// quit the main loop
void adonthell::main_quit ()
{
    letsexit = true;
}

// fade the screen out
void adonthell::fade_out ()
{
    s_int16 i = 0;
    
    while (i < 60)
    {
        gametime::update ();
        i += gametime::frames_to_skip () * 2;
        if (i > 60) i = 60;
        
        main_loop ();

        screen::transition (i * 2);
        screen::show ();
    }
}

// fade the screen in
void adonthell::fade_in ()
{
    s_int16 i = 60;
    
    while (i > 0)
    {
        gametime::update ();
        i -= gametime::frames_to_skip () * 2;
        if (i < 0) i = 0;
        
        main_loop ();

        screen::transition (i * 2);
        screen::show ();
    }
}

// load the engine state
s_int8 adonthell::get_state (igzstream& file)
{
    string name;
    
    // get the current time
    gamedate::get_state (file);

    // Get the map filename 
    name << file; 
    // Load the map from the file
    lmap.get (file); 
    // Load the map state (events)
    if (!lmap.get_state (file))
        return false; 

    view.mapview::attach_map (&lmap);

    // Load the mapview state
    view.mapview::get_state (file);
    view.pack ();
    
    return true;
}

// save the engine state
s_int8 adonthell::put_state (ogzstream& file)
{
    // save the current time
    gamedate::put_state (file);
    
    // Save the map filename
    string name = lmap.filename ();
    name >> file; 

    // Save the map itself
    lmap.put (file); 
    // Save the map state (events)
    lmap.put_state (file); 
    // Save the mapview state
    view.mapview::put_state (file);

    return 0;
}

void adonthell::mapview_start ()
{
    set_update_map (true);
    
    view.mapview::resize (screen::length (), screen::height ());
    view.mapview::attach_map (&lmap);

    view.set_visible (true);
    view.pack ();
    
    win_manager::active->add (&view);
}

void adonthell::mapview_stop ()
{
    set_update_map (false);
    view.mapview::detach_map ();
    win_manager::active->remove (&view);
}