#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <time.h> 
#include <stdint.h>
#include <wayland-client.h>
#include <wayland-util.h>
#include <SDL3/SDL.h>
#include <pthread.h>
#include <sys/mman.h>
#include "renderer.h"
#include "shm.h"
#include "xdg-shell-protocol.h"
#include <EGL/egl.h>
#include <wayland-egl.h>

struct client_state {
    int width, height;
    /* Globals */
    struct wl_display *wl_display;
    struct wl_registry *wl_registry;
    struct wl_shm *wl_shm;
    struct wl_compositor *wl_compositor;
    struct xdg_wm_base *xdg_wm_base;
    /* Objects */
    struct wl_surface *wl_surface;
    struct xdg_surface *xdg_surface;
    struct xdg_toplevel *xdg_toplevel;

	struct wl_egl_window *egl_window;

	EGLDisplay egl_display;
	EGLConfig egl_config;
	EGLSurface egl_surface;
	EGLContext egl_context;
};

static void
wl_buffer_release(void *data, struct wl_buffer *wl_buffer)
{
    /* Sent by the compositor when it's no longer using this buffer */
    wl_buffer_destroy(wl_buffer);
}

static const struct wl_buffer_listener wl_buffer_listener = {
    .release = wl_buffer_release,
};


static struct wl_buffer *
draw_frame(struct client_state *state)
{
    int stride = state->width * 4;
    int size = stride * state->height;

    int fd = allocate_shm_file(size);
    if (fd == -1) {
        return NULL;
    }

    uint32_t *data = mmap(NULL, size,
            PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if (data == MAP_FAILED) {
        close(fd);
        return NULL;
    }

    struct wl_shm_pool *pool = wl_shm_create_pool(state->wl_shm, fd, size);
    struct wl_buffer *buffer = wl_shm_pool_create_buffer(pool, 0,
            state->width, state->height, stride, WL_SHM_FORMAT_XRGB8888);
    wl_shm_pool_destroy(pool);
    close(fd);

    /* Draw checkerboxed background */
    for (int y = 0; y < state->height; ++y) {
        for (int x = 0; x < state->width; ++x) {
            if ((x + y / 8 * 8) % 16 < 8)
                data[y * state->width + x] = 0xFF666666;
            else
                data[y * state->width + x] = 0xFFEEEEEE;
        }
    }

    munmap(data, size);
    wl_buffer_add_listener(buffer, &wl_buffer_listener, NULL);
    return buffer;
}

static void
xdg_surface_configure(void *data,
        struct xdg_surface *xdg_surface, uint32_t serial)
{
    struct client_state *state = data;
    xdg_surface_ack_configure(xdg_surface, serial);

    struct wl_buffer *buffer = draw_frame(state);
    wl_surface_attach(state->wl_surface, buffer, 0, 0);
    wl_surface_commit(state->wl_surface);
}

static const struct xdg_surface_listener xdg_surface_listener = {
    .configure = xdg_surface_configure,
};

static void
xdg_wm_base_ping(void *data, struct xdg_wm_base *xdg_wm_base, uint32_t serial)
{
    xdg_wm_base_pong(xdg_wm_base, serial);
}

static const struct xdg_wm_base_listener xdg_wm_base_listener = {
    .ping = xdg_wm_base_ping,
};

static void
registry_handle_global(void *data, struct wl_registry *registry,
		uint32_t name, const char *interface, uint32_t version)
{
	printf("interface: '%s', version: %d, name: %d\n",
			interface, version, name);

    struct client_state *state = data;

    if (strcmp(interface, wl_shm_interface.name) == 0) {
        state->wl_shm = wl_registry_bind(
                registry, name, &wl_shm_interface, 1);
    } else if (strcmp(interface, wl_compositor_interface.name) == 0) {
        state->wl_compositor = wl_registry_bind(
                registry, name, &wl_compositor_interface, 4);
    } else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
        state->xdg_wm_base = wl_registry_bind(
                registry, name, &xdg_wm_base_interface, 1);
        xdg_wm_base_add_listener(state->xdg_wm_base,
                &xdg_wm_base_listener, state);
    }

}

static void
registry_handle_global_remove(void *data, struct wl_registry *registry,
		uint32_t name)
{
	// This space deliberately left blank
}

static const struct wl_registry_listener
wl_registry_listener = {
	.global = registry_handle_global,
	.global_remove = registry_handle_global_remove,
};

static void egl_init(struct client_state *state) {
	EGLint major;
	EGLint minor;
	EGLint num_configs;
	EGLint attribs[] = {
		EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
		EGL_NONE
	};

	state->egl_window = wl_egl_window_create(state->wl_surface, state->width,
							state->height);

	state->egl_display = eglGetDisplay((EGLNativeDisplayType) state->wl_display);
	if(state->wl_display == EGL_NO_DISPLAY) {
		fprintf(stderr, "Couldn't get EGL display\n");
		exit(EXIT_FAILURE);
	}

	if(eglInitialize(state->egl_display, &major, &minor) != EGL_TRUE) {
		fprintf(stderr, "Couldnt initialize EGL\n");
		exit(EXIT_FAILURE);
	}

	if(eglChooseConfig(state->egl_display, attribs, &state->egl_config, 1,
			&num_configs) != EGL_TRUE) {
		fprintf(stderr, "Couldn't find matching EGL config\n");
		exit(EXIT_FAILURE);
	}

	state->egl_surface = eglCreateWindowSurface(state->egl_display,
							state->egl_config,
							(EGLNativeWindowType) state->egl_window, NULL);
	if(state->egl_surface == EGL_NO_SURFACE) {
		fprintf(stderr, "Couldn't create EGL surface\n");
		exit(EXIT_FAILURE);
	}

	state->egl_context = eglCreateContext(state->egl_display, state->egl_config,
							EGL_NO_CONTEXT, NULL);
	if(state->egl_context == EGL_NO_CONTEXT) {
		fprintf(stderr, "Couldn't create EGL context\n");
		exit(EXIT_FAILURE);
	}

	if(!eglMakeCurrent(state->egl_display, state->egl_surface,
			state->egl_surface, state->egl_context)) {
		fprintf(stderr, "Couldn't make EGL context current\n");
		exit(EXIT_FAILURE);
	}
}

int
main(int argc, char *argv[])
{
    int width = 700, height = 450;
    struct client_state state = { width, height, 0 };
    state.wl_display = wl_display_connect(NULL);
    state.wl_registry = wl_display_get_registry(state.wl_display);
    wl_registry_add_listener(state.wl_registry, &wl_registry_listener, &state);
    wl_display_roundtrip(state.wl_display);

    state.wl_surface = wl_compositor_create_surface(state.wl_compositor);
    state.xdg_surface = xdg_wm_base_get_xdg_surface(
            state.xdg_wm_base, state.wl_surface);
    xdg_surface_add_listener(state.xdg_surface, &xdg_surface_listener, &state);
    state.xdg_toplevel = xdg_surface_get_toplevel(state.xdg_surface);
    xdg_toplevel_set_title(state.xdg_toplevel, "GLONKERS!");
    wl_surface_commit(state.wl_surface);

    while (wl_display_dispatch(state.wl_display)) {
        /* This space deliberately left blank */
    }

    return 0;
}