/*
Crafter®.Graphics
Copyright (C) 2025 Catcrafts®
Catcrafts.net

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3.0 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
*/

module;

#include <errno.h>
#include <fcntl.h>
#include <linux/input.h>
#include <string>
#include <sys/mman.h>
#include <unistd.h>
#include <wayland-cursor.h>
#include <xkbcommon/xkbcommon.h>
#include <iostream>
#include <vulkan/vulkan.h>
#include <vulkan/vulkan_wayland.h>
#include <wayland-client.h>
#include <cstring>
#include "xdg-shell-client-protocol.h"
#include "wayland-xdg-decoration-unstable-v1-client-protocol.h"
#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <print>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <wayland-client.h>
#include <wayland-client-protocol.h>
#include <linux/input-event-codes.h>
#include <cmath>
#include <thread>

module Crafter.Graphics;
import Crafter.Event;
using namespace Crafter;


void ScaleBitmapR8G8B8(Pixel_RU8_GU8_BU8_AU8* dst, const Pixel_RU8_GU8_BU8_AU8* src, std::uint32_t srcWidth, std::uint32_t srcHeight, std::uint32_t dstWidth, std::uint32_t dstHeight) {
    for (std::uint32_t y = 0; y < dstHeight; y++) {
		std::uint32_t srcY = y * srcHeight / dstHeight;
        for (std::uint32_t x = 0; x < dstWidth; x++) {
            std::uint32_t srcX = x * srcWidth / dstWidth;
            const Pixel_RU8_GU8_BU8_AU8* srcPixel = src + (srcY * srcWidth + srcX);
			Pixel_RU8_GU8_BU8_AU8* dstPixel = dst + (y * dstWidth + x);
            dstPixel[0] = srcPixel[0];
        }
    }
}

WindowWaylandWayland::WindowWaylandWayland(std::string name, std::uint32_t width, std::uint32_t height) : WindowWayland(name, width, height) {

}

void WindowWaylandWayland::Start() {
	thread = std::thread([this](){
		while (open && wl_display_dispatch(display) != -1) {
			wl_surface_attach(surface, buffer, 0, 0);
			for(UiElement* element : elements.components) {
				std::int32_t realX;
				std::int32_t realY;
				std::int32_t elementWidth;
				std::int32_t elementHeight;
				if(element->ignoreScaling) {
					if(element->useRelativeSize) {
						elementWidth = element->relativeWidth*width;
						elementHeight = element->relativeHeight*height;
					} else {
						elementWidth = element->absoluteWidth;
						elementHeight = element->absoluteHeight;
					}
				} else {
					if(element->useRelativeSize) {
						elementWidth = element->relativeWidth*width*scale;
						elementHeight = element->relativeHeight*height*scale;
					} else {
						elementWidth = element->absoluteWidth*scale;
						elementHeight = element->absoluteHeight*scale;
					}
				}
				realX = (element->anchorX*width)-(element->anchorOffsetX*elementWidth);
				realY = (element->anchorY*height)-(element->anchorOffsetY*elementHeight);
				std::vector<Pixel_RU8_GU8_BU8_AU8> scaled(elementWidth*elementHeight);
				ScaleBitmapR8G8B8(scaled.data(), element->buffer.data(), element->bufferWidth, element->bufferHeight, elementWidth, elementHeight);
				for(std::int32_t x = realX; x-realX < elementWidth; x++) {
					for(std::int32_t y = realY; y-realY < elementHeight; y++) {
						if(x > 0 && x < width && y > 0 && y < height) {
							shm_data[x*width+y] = scaled[(x-realX)*elementWidth+(y-realY)];
						}
					}
				}
				wl_surface_damage(surface, realX, realY, elementWidth, elementHeight);
			}
			wl_surface_commit(surface);
		}
	});
}