#include "config.h"

#include "gskvulkanrendererprivate.h"

#include "gskdebugprivate.h"
#include "gskprivate.h"
#include "gskrendererprivate.h"
#include "gskrendernodeprivate.h"
#include "gsktextureprivate.h"
#include "gskvulkanbufferprivate.h"
#include "gskvulkanimageprivate.h"
#include "gskvulkanpipelineprivate.h"
#include "gskvulkanrenderprivate.h"

#include <graphene.h>

typedef struct _GskVulkanTextureData GskVulkanTextureData;

struct _GskVulkanTextureData {
  GskTexture *texture;
  GskVulkanImage *image;
  GskVulkanRenderer *renderer;
};

#ifdef G_ENABLE_DEBUG
typedef struct {
  GQuark cpu_time;
  GQuark gpu_time;
} ProfileTimers;
#endif

struct _GskVulkanRenderer
{
  GskRenderer parent_instance;

  GdkVulkanContext *vulkan;

  guint n_targets;
  GskVulkanImage **targets;

  VkSampler sampler;

  GskVulkanRender *render;

  GSList *textures;

#ifdef G_ENABLE_DEBUG
  ProfileTimers profile_timers;
#endif
};

struct _GskVulkanRendererClass
{
  GskRendererClass parent_class;
};

G_DEFINE_TYPE (GskVulkanRenderer, gsk_vulkan_renderer, GSK_TYPE_RENDERER)

static void
gsk_vulkan_renderer_free_targets (GskVulkanRenderer *self)
{
  guint i;

  for (i = 0; i < self->n_targets; i++)
    {
      g_object_unref (self->targets[i]);
    }

  g_clear_pointer (&self->targets, g_free);
  self->n_targets = 0;
}

static void
gsk_vulkan_renderer_update_images_cb (GdkVulkanContext  *context,
                                      GskVulkanRenderer *self)
{
  GdkWindow *window;
  gint scale_factor;
  gsize width, height;
  guint i;

  gsk_vulkan_renderer_free_targets (self);

  self->n_targets = gdk_vulkan_context_get_n_images (context);
  self->targets = g_new (GskVulkanImage *, self->n_targets);

  window = gsk_renderer_get_window (GSK_RENDERER (self));
  scale_factor = gdk_window_get_scale_factor (window);
  width = gdk_window_get_width (window) * scale_factor;
  height = gdk_window_get_height (window) * scale_factor;

  for (i = 0; i < self->n_targets; i++)
    {
      self->targets[i] = gsk_vulkan_image_new_for_swapchain (self->vulkan,
                                                             gdk_vulkan_context_get_image (context, i),
                                                             gdk_vulkan_context_get_image_format (self->vulkan),
                                                             width, height);
    }
}

static gboolean
gsk_vulkan_renderer_realize (GskRenderer  *renderer,
                             GdkWindow    *window,
                             GError      **error)
{
  GskVulkanRenderer *self = GSK_VULKAN_RENDERER (renderer);
  VkDevice device;

  self->vulkan = gdk_window_create_vulkan_context (window, error);
  if (self->vulkan == NULL)
    return FALSE;

  device = gdk_vulkan_context_get_device (self->vulkan);

  GSK_VK_CHECK (vkCreateSampler, device,
                                 &(VkSamplerCreateInfo) {
                                     .sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
                                     .magFilter = VK_FILTER_LINEAR,
                                     .minFilter = VK_FILTER_LINEAR,
                                     .addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_BORDER,
                                     .addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_BORDER,
                                     .addressModeW = VK_SAMPLER_ADDRESS_MODE_REPEAT,
                                     .borderColor = VK_BORDER_COLOR_FLOAT_TRANSPARENT_BLACK,
                                     .unnormalizedCoordinates = VK_FALSE
                                 },
                                 NULL,
                                 &self->sampler);

  g_signal_connect (self->vulkan,
                    "images-updated",
                    G_CALLBACK (gsk_vulkan_renderer_update_images_cb),
                    self);
  gsk_vulkan_renderer_update_images_cb (self->vulkan, self);

  self->render = gsk_vulkan_render_new (renderer, self->vulkan);

  return TRUE;
}

static void
gsk_vulkan_renderer_unrealize (GskRenderer *renderer)
{
  GskVulkanRenderer *self = GSK_VULKAN_RENDERER (renderer);
  VkDevice device;
  GSList *l;

  for (l = self->textures; l; l = l->next)
    {
      GskVulkanTextureData *data = l->data;

      data->renderer = NULL;
      gsk_texture_clear_render_data (data->texture);
    }
  g_clear_pointer (&self->textures, (GDestroyNotify) g_slist_free);

  g_clear_pointer (&self->render, gsk_vulkan_render_free);

  device = gdk_vulkan_context_get_device (self->vulkan);

  gsk_vulkan_renderer_free_targets (self);
  g_signal_handlers_disconnect_by_func(self->vulkan,
                                       gsk_vulkan_renderer_update_images_cb,
                                       self);

  vkDestroySampler (device,
                    self->sampler,
                    NULL);
  self->sampler = VK_NULL_HANDLE;

  g_clear_object (&self->vulkan);
}

static void
gsk_vulkan_renderer_render (GskRenderer   *renderer,
                            GskRenderNode *root)
{
  GskVulkanRenderer *self = GSK_VULKAN_RENDERER (renderer);
  GskVulkanRender *render;
#ifdef G_ENABLE_DEBUG
  GskProfiler *profiler;
  gint64 cpu_time;
#endif

#ifdef G_ENABLE_DEBUG
  profiler = gsk_renderer_get_profiler (renderer);
  gsk_profiler_timer_begin (profiler, self->profile_timers.cpu_time);
#endif

  render = self->render;

  gsk_vulkan_render_reset (render, self->targets[gdk_vulkan_context_get_draw_index (self->vulkan)]);

  gsk_vulkan_render_add_node (render, root);

  gsk_vulkan_render_upload (render);

  gsk_vulkan_render_draw (render, self->sampler);

  gsk_vulkan_render_submit (render);

#ifdef G_ENABLE_DEBUG
  cpu_time = gsk_profiler_timer_end (profiler, self->profile_timers.cpu_time);
  gsk_profiler_timer_set (profiler, self->profile_timers.cpu_time, cpu_time);

  gsk_profiler_push_samples (profiler);
#endif
}

static GdkDrawingContext *
gsk_vulkan_renderer_begin_draw_frame (GskRenderer          *renderer,
                                      const cairo_region_t *region)
{
  GskVulkanRenderer *self = GSK_VULKAN_RENDERER (renderer);
  cairo_region_t *whole_window;
  GdkDrawingContext *result;
  GdkWindow *window;

  window = gsk_renderer_get_window (renderer);
  
  whole_window = cairo_region_create_rectangle (&(GdkRectangle) {
                                                    0, 0,
                                                    gdk_window_get_width (window),
                                                    gdk_window_get_height (window)
                                                });

  result = gdk_window_begin_draw_frame (window,
                                        GDK_DRAW_CONTEXT (self->vulkan),
                                        whole_window);

  cairo_region_destroy (whole_window);

  return result;
}

static void
gsk_vulkan_renderer_class_init (GskVulkanRendererClass *klass)
{
  GskRendererClass *renderer_class = GSK_RENDERER_CLASS (klass);

  renderer_class->realize = gsk_vulkan_renderer_realize;
  renderer_class->unrealize = gsk_vulkan_renderer_unrealize;
  renderer_class->render = gsk_vulkan_renderer_render;
  renderer_class->begin_draw_frame = gsk_vulkan_renderer_begin_draw_frame;
}

static void
gsk_vulkan_renderer_init (GskVulkanRenderer *self)
{
#ifdef G_ENABLE_DEBUG
  GskProfiler *profiler = gsk_renderer_get_profiler (GSK_RENDERER (self));
#endif

  gsk_ensure_resources ();

#ifdef G_ENABLE_DEBUG
  self->profile_timers.cpu_time = gsk_profiler_add_timer (profiler, "cpu-time", "CPU time", FALSE, TRUE);
#endif
}

static void
gsk_vulkan_renderer_clear_texture (gpointer p)
{
  GskVulkanTextureData *data = p;

  if (data->renderer != NULL)
    data->renderer->textures = g_slist_remove (data->renderer->textures, data);

  g_object_unref (data->image);

  g_slice_free (GskVulkanTextureData, data);
}

GskVulkanImage *
gsk_vulkan_renderer_ref_texture_image (GskVulkanRenderer *self,
                                       GskTexture        *texture,
                                       VkCommandBuffer    command_buffer)
{
  GskVulkanTextureData *data;
  cairo_surface_t *surface;
  GskVulkanImage *image;

  data = gsk_texture_get_render_data (texture, self);
  if (data)
    return g_object_ref (data->image);

  surface = gsk_texture_download (texture);
  image = gsk_vulkan_image_new_from_data (self->vulkan,
                                          command_buffer,
                                          cairo_image_surface_get_data (surface),
                                          cairo_image_surface_get_width (surface),
                                          cairo_image_surface_get_height (surface),
                                          cairo_image_surface_get_stride (surface));
  cairo_surface_destroy (surface);

  data = g_slice_new0 (GskVulkanTextureData);
  data->image = image;
  data->texture = texture;
  data->renderer = self;

  if (gsk_texture_set_render_data (texture, self, data, gsk_vulkan_renderer_clear_texture))
    {
      g_object_ref (data->image);
      self->textures = g_slist_prepend (self->textures, data);
    }
  else
    {
      g_slice_free (GskVulkanTextureData, data);
    }

  return image;
}