/*
Crafter®.Graphics
Copyright (C) 2026 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 version 3.0 as published by the Free Software Foundation;

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;

#ifdef CRAFTER_GRAPHICS_WINDOW_WAYLAND
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/input-event-codes.h>
#include <xkbcommon/xkbcommon.h>
#include "../lib/xdg-shell-client-protocol.h"
#include "../lib/wayland-xdg-decoration-unstable-v1-client-protocol.h"
#include "../lib/fractional-scale-v1.h"
#include "../lib/viewporter.h"
#include <string.h>
#include <linux/input.h>
#include <sys/mman.h>
#include <wayland-cursor.h>
#include <errno.h>
#include <fcntl.h>
#include <print>
#include <wayland-client.h>
#include <wayland-client-protocol.h>
#endif
#ifdef CRAFTER_GRAPHICS_RENDERER_VULKAN
#include "vulkan/vulkan.h"
#endif

export module Crafter.Graphics:Window;
import std;
import :Types;
import :Rendertarget;
import :Transform2D;
import Crafter.Event;
#ifdef CRAFTER_GRAPHICS_RENDERER_VULKAN
import :PipelineRTVulkan;
#endif

export namespace Crafter {
    #ifdef CRAFTER_GRAPHICS_RENDERER_VULKAN
    struct Semaphores {
		// Swap chain image presentation
		VkSemaphore presentComplete;
		// Command buffer submission and execution
		VkSemaphore renderComplete;
	};
    #endif

    struct MouseElement;
    struct Window {
        FrameTime currentFrameTime;
        std::uint32_t width; 
        std::uint32_t height;
        std::chrono::time_point<std::chrono::high_resolution_clock> lastFrameBegin;
        Event<void> onClose;
        Event<FrameTime> onUpdate;
        bool open = true;
        bool updating = false;
        bool heldkeys[static_cast<std::uint32_t>(CrafterKeys::CrafterKeysMax)] = {};
        Event<void> onKeyDown[static_cast<std::uint32_t>(CrafterKeys::CrafterKeysMax)];
        Event<void> onKeyHold[static_cast<std::uint32_t>(CrafterKeys::CrafterKeysMax)];
        Event<void> onKeyUp[static_cast<std::uint32_t>(CrafterKeys::CrafterKeysMax)];
        Event<CrafterKeys> onAnyKeyDown;
        Event<CrafterKeys> onAnyKeyHold;
        Event<CrafterKeys> onAnyKeyUp;
        Event<void> onMouseRightClick;
        Event<void> onMouseLeftClick;
        Event<void> onMouseRightHold;
        Event<void> onMouseLeftHold;
        Event<void> onMouseRightRelease;
        Event<void> onMouseLeftRelease;
        Event<void> onMouseMove;
        Event<void> onMouseEnter;
        Event<void> onMouseLeave;
        Event<std::uint32_t> onMouseScroll;
        Vector<float, 2> currentMousePos;
        Vector<float, 2> lastMousePos;
        Vector<float, 2> mouseDelta;
        bool mouseLeftHeld = false;
        bool mouseRightHeld = false;
        std::vector<MouseElement*> mouseElements;
        std::vector<MouseElement*> pendingMouseElements;

        Window(std::uint32_t width, std::uint32_t height);
        Window(std::uint32_t width, std::uint32_t height, const std::string_view title);
        Window(Window&) = delete;
        Window(Window&&) = delete;
        Window& operator=(const Window&) = delete;

        void StartSync();
        void StartUpdate();
        void StopUpdate();
        void SetTitle(const std::string_view title);
        void Resize(std::uint32_t width, std::uint32_t height);
        void Render();
        void Update();

        #ifdef CRAFTER_TIMING
        std::chrono::nanoseconds totalUpdate;
        std::vector<std::pair<const EventListener<FrameTime>*, std::chrono::nanoseconds>> updateTimings;
        std::chrono::nanoseconds totalRender;
        std::chrono::nanoseconds vblank;
        std::chrono::nanoseconds totalFrame;
        std::chrono::time_point<std::chrono::high_resolution_clock> frameEnd;
        std::vector<std::chrono::nanoseconds> frameTimes;
        void LogTiming();
        #endif

        #ifdef CRAFTER_GRAPHICS_WINDOW_WAYLAND
        float scale;
        #ifdef CRAFTER_GRAPHICS_RENDERER_SOFTWARE
        Rendertarget renderer;
        #endif
        bool configured = false;
        xdg_toplevel* xdgToplevel = nullptr;
        wp_viewport* wpViewport = nullptr;
        wl_surface* surface = nullptr;
        wl_buffer* buffer = nullptr;
        wl_buffer* backBuffer = nullptr;
        xdg_surface* xdgSurface = nullptr;
        wl_callback* cb = nullptr;

        static void xdg_surface_handle_preferred_scale(void* data, wp_fractional_scale_v1*, std::uint32_t scale);
        static void wl_surface_frame_done(void *data, wl_callback *cb, uint32_t time);
        static void xdg_toplevel_handle_close(void* data, xdg_toplevel*);
        static void xdg_surface_handle_configure(void* data, xdg_surface* xdg_surface, std::uint32_t serial);
        static void xdg_toplevel_configure(void*, xdg_toplevel*, std::int32_t, std::int32_t, wl_array*);

        constexpr static xdg_toplevel_listener xdg_toplevel_listener = {
            .configure = xdg_toplevel_configure,
            .close = xdg_toplevel_handle_close,
        };
        constexpr static wl_callback_listener wl_callback_listener = {
            .done = wl_surface_frame_done,
        };
        constexpr static xdg_surface_listener xdg_surface_listener = {
            .configure = xdg_surface_handle_configure,
        };
        constexpr static wp_fractional_scale_v1_listener wp_fractional_scale_v1_listener = {
            .preferred_scale = xdg_surface_handle_preferred_scale,
        };
        inline static wp_fractional_scale_v1* wp_scale = nullptr;
        #endif

        #ifdef CRAFTER_GRAPHICS_RENDERER_VULKAN
        std::vector<VkDescriptorSet> descriptorsRt;
        template <typename Pipeline>
        void SetPipelineRT() {
            rtPipeline = Pipeline::pipeline;
            rtPipelineLayout = Pipeline::pipelineLayout;
            raygenRegion = Pipeline::raygenRegion;
            missRegion = Pipeline::missRegion;
            hitRegion = Pipeline::hitRegion;
            callableRegion = Pipeline::callableRegion;
        }
        void SetPipelineRT(PipelineRTVulkan& pipeline);
        VkCommandBuffer StartInit();
        void FinishInit();
        void CreateSwapchain();
        static constexpr std::uint8_t numFrames = 3;
        VkSurfaceKHR vulkanSurface = VK_NULL_HANDLE;
        VkSwapchainKHR swapChain = VK_NULL_HANDLE;
        VkFormat colorFormat;
        VkColorSpaceKHR colorSpace;
        VkImage images[numFrames];
        VkImageView imageViews[numFrames];
        std::thread thread;
        VkCommandBuffer drawCmdBuffers[numFrames];
        VkSubmitInfo submitInfo;
        Semaphores semaphores;
        std::uint32_t currentBuffer = 0;
        VkPipelineStageFlags submitPipelineStages = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
        VkPipeline rtPipeline;
        VkPipelineLayout rtPipelineLayout;
        VkStridedDeviceAddressRegionKHR raygenRegion;
        VkStridedDeviceAddressRegionKHR missRegion;
        VkStridedDeviceAddressRegionKHR hitRegion;
        VkStridedDeviceAddressRegionKHR callableRegion;
        #endif
    };
}