#include "GameView.hh"
#include "Graphics.hh"

#include <cassert>

namespace graphics
{

GameView::GameView (GameState &state, LocalPlayer *player) :
    View(PixelArea(0, 0, graphics->display.get_width(), graphics->display.get_height())),
    state(state), player(NULL), info_view(NULL), message_view(getMessageViewArea()),
    flags(0)
{
    // have player?
    if (player)
        setPlayer(player);

    // insert message
    message_view.add_message(CL_Color::white, "Hello World!");
}

void GameView::setPlayer (LocalPlayer *player) {
    assert(!this->player && player);
    
    // remember it
    this->player = player;

    // build the info_view as well
    info_view = new PlayerInfoView(getInfoViewArea(), player);
}

/*
 * Helper function for Camera
 */
static PixelDimension value_between (PixelDimension low, PixelDimension value, PixelDimension high) {
        if (high < low)
            return (high + low) / 2;

        else if (value < low)
            return low;

        else if (value > high)
            return high;

        else
            return value;
}

void GameView::draw (Display &display) {
    CL_GraphicContext *gc = display.get_gc();

    // calculate camera
    PixelCoordinate camera(0, 0);
    
    // ...to track our local player
    if (player != NULL) {
        // display resolution
        PixelCoordinate resolution = display.getResolution();

        // try and center the screen on the player
        PixelCoordinate target = player->getCoordinate() - PixelCoordinate(resolution.x / 2, (resolution.y - 100) / 2);

        // ...but keep the world in view
        PixelCoordinate max = state.terrain.getDimensions() - resolution + PixelCoordinate(0, 100);
        
        // ...by limiting the value to 0...max
        camera = PixelCoordinate(
            value_between(0, target.x, max.x),
            value_between(0, target.y, max.y)
        );
    }
    
    // Black background
    gc->clear(CL_Color::black);

    // Draw the game
    state.draw(display, camera, flags & GUI_INPUT_DISPLAY_WEAPON);
    
    // draw info view?
    if (info_view)
        info_view->draw(display);

    // draw messages
    message_view.draw(display);
}

void GameView::resize (const PixelArea &new_area) {
    View::resize(new_area);
    
    // resize subcomponents
    if (info_view)
        info_view->resize(getInfoViewArea());
    
    message_view.resize(getMessageViewArea());

    // log message
    message_view.add_message(CL_Color::yellow, CL_String::format("[ Resized window to %1 x %2 ]", (int) getWidth(), (int) getHeight()));
}


}