#include <HsFFI.h>

#include <stdlib.h>
#include <gtk/gtk.h>
#include "config.h"

GtkWidget *window;
GtkWidget *input;
GtkWidget *box;
GtkWidget *scwin;
GtkWidget *flowbox;
GtkEntryBuffer *input_buffer;
char *labels;
GtkWidget **buttons;

bool inited = false;

extern char *searchCharacterByName (const char *);
extern char *favoriteEmojis (void);

// forward declaration
void on_click (GtkWidget *widget, gpointer data);

void draw_results (GtkText *text, char *results)
{
  if (!inited)
    {
      scwin = gtk_scrolled_window_new ();
      flowbox = gtk_flow_box_new ();
      gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scwin), flowbox);
      gtk_box_append (GTK_BOX (box), scwin);
    }
  else
    {
      flowbox = gtk_flow_box_new ();
      gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scwin), flowbox);
    }

  inited = true;
  
  graphene_rect_t box_bounds;
  if (gtk_widget_compute_bounds (box, window, &box_bounds))
    {
      graphene_rect_t text_bounds;
      if (gtk_widget_compute_bounds (GTK_WIDGET (text), window, &text_bounds))
	{
	  int height = box_bounds.size.height - text_bounds.size.height - 10;
	  gtk_scrolled_window_set_max_content_height (GTK_SCROLLED_WINDOW (scwin), height);
	  gtk_scrolled_window_set_min_content_height (GTK_SCROLLED_WINDOW (scwin), height);
	}
    }

  gsize buf_size = gtk_entry_buffer_get_bytes (input_buffer);
  size_t l = strlen (results);

  if (l == 0)
    {
      return;
    }
  
  wchar_t symbols[l];
  int i = 0;
  int o = 0;
  int o_ = 0;
  mbstowcs (symbols, results, l);

  if (buttons)
    {
      buttons = realloc (buttons, l * sizeof (GtkWidget *));
    }
  else
    {
      buttons = malloc (l * sizeof (GtkWidget *));
    }
  memset (buttons, 0, l * sizeof (GtkWidget *));
  
  if (labels)
    {
      labels = realloc (labels, 5*l);
    }
  else
    {
      labels = malloc (5*l);
    }
  memset (labels, 0, 5*l);
  
  while (symbols[i])
    {
      const  wchar_t hold[] = { symbols[i], 0 };
      o_ += wcstombs (&labels[o], hold, 4) +1;
      buttons[i] = gtk_button_new_with_label (&labels[o]);
      g_signal_connect (buttons[i], "clicked", G_CALLBACK (on_click), &labels[o]);
      gtk_flow_box_append ((GtkFlowBox *)flowbox, buttons[i]);
      ++i;
      o = o_;
    }
}

void
on_click (GtkWidget *widget, gpointer data)
{
  gdk_clipboard_set_text (gtk_widget_get_primary_clipboard (widget), (char *)data);
}

void
on_input (GtkText *text, gpointer user_data)
{
  const char *buffer_contents = gtk_entry_buffer_get_text (input_buffer);   
  char *results = searchCharacterByName (buffer_contents);
  draw_results (text, results);
}

void
activate (GtkApplication *app, gpointer user_data)
{
  window = gtk_application_window_new (app);
  gtk_window_set_title (GTK_WINDOW (window), "pickme");
  gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);

  input_buffer = gtk_entry_buffer_new (NULL, -1);
  input = gtk_text_new_with_buffer (input_buffer);
  g_signal_connect (input, "activate", G_CALLBACK (on_input), NULL);

  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
  gtk_box_set_homogeneous (GTK_BOX (box), FALSE);
  gtk_box_append (GTK_BOX (box), input);
  gtk_window_set_child (GTK_WINDOW (window), box);

  gtk_window_present (GTK_WINDOW (window));

  if (strcmp (favoriteEmojis (), ""))
    {
      draw_results (GTK_TEXT (input), favoriteEmojis ());
    }
}

void
shutdown (GtkApplication *app, gpointer user_data)
{
  if (!inited)
    {
      free (buttons);
      free (labels);
    }
}

int
main (int argc, char **argv)
{
  hs_init (&argc, &argv);
  
  GtkApplication *app;
  int res;

  app = gtk_application_new (APP_ID, G_APPLICATION_DEFAULT_FLAGS);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  g_signal_connect (app, "shutdown", G_CALLBACK (shutdown), NULL);
  res = g_application_run (G_APPLICATION (app), argc, argv);
  g_object_unref (app);

  return res;
}