#include "Core.h"
#include <Console.h>
#include <Export.h>
#include <PluginManager.h>
#include <modules/Gui.h>
#include <vector>
#include <cstdio>
#include <stack>
#include <string>
#include <cmath>

#include <VTableInterpose.h>
#include "df/graphic.h"
#include "df/viewscreen_titlest.h"

using std::vector;
using std::string;
using std::stack;
using namespace DFHack;

using df::global::gps;

DFHACK_PLUGIN("vshook");

struct title_hook : df::viewscreen_titlest {
    typedef df::viewscreen_titlest interpose_base;

    DEFINE_VMETHOD_INTERPOSE(void, render, ())
    {
        INTERPOSE_NEXT(render)();

        if (gps) {
            uint8_t *buf = gps->screen;
            int32_t *stp = gps->screentexpos;

            for (const char *p = "DFHack " DFHACK_VERSION;
                 *p && buf < gps->screen_limit;
                 p++, buf += gps->dimy*4, stp += gps->dimy)
            {
                buf[0] = *p; buf[1] = 7; buf[2] = 0; buf[3] = 1;
                *stp = 0;
            }
        }
    }
};

IMPLEMENT_VMETHOD_INTERPOSE(title_hook, render);

DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <PluginCommand> &commands)
{
    if (gps)
    {
        if (!INTERPOSE_HOOK(title_hook, render).apply())
            out.printerr("Could not interpose viewscreen_titlest::render\n");
    }

    return CR_OK;
}

DFhackCExport command_result plugin_shutdown ( color_ostream &out )
{
    INTERPOSE_HOOK(title_hook, render).remove();
    return CR_OK;
}