#include "flashcardsappwin.h"

#include <glib/gi18n.h>

#include "database.h"

#include "create-card.h"
#include "create-category.h"

struct _FlashcardsAppWindow
{
  AdwApplicationWindow parent;

  sqlite3 *db;
  GArray *categories;
  GQueue *cards;
  category current_category;
  card *current_card;

  AdwWindowTitle *title;

  GtkButton *add_card_button;
  GtkButton *delete_card_button;
  GtkButton *delete_category_button;

  AdwNavigationSplitView *split_view;
  AdwNavigationPage *sidebar;
  AdwNavigationPage *content;

  AdwViewStack *main_view;
  GtkWidget *placeholder_category;
  GtkWidget *placeholder_card;
  GtkWidget *flashcard;

  GtkListBox *topics;

  GtkLabel *card_title;

  bool started;
};

G_DEFINE_TYPE (FlashcardsAppWindow, flashcards_app_window,
               ADW_TYPE_APPLICATION_WINDOW);

static void
load_categories (FlashcardsAppWindow *win)
{
  gtk_list_box_remove_all (win->topics);

  win->categories = database_load_categories (win->db);

  for (guint i = 0; i < win->categories->len; i++)
    {
      category c = g_array_index (win->categories, category, i);
      printf ("%d: %s\n", c.id, c.name);

      GtkWidget *child = gtk_list_box_row_new ();
      GtkWidget *label = gtk_label_new (c.name);
      gtk_widget_set_halign (label, GTK_ALIGN_START);
      gtk_label_set_ellipsize (GTK_LABEL (label), PANGO_ELLIPSIZE_MIDDLE);
      gtk_widget_set_tooltip_text (label, c.name);
      gtk_list_box_row_set_child (GTK_LIST_BOX_ROW (child), label);

      gtk_list_box_append (win->topics, child);
    }
}

static void
next_card (FlashcardsAppWindow *win)
{
  if (win->cards->length <= 0)
    {
      adw_view_stack_set_visible_child (win->main_view, win->placeholder_card);
      gtk_widget_set_visible (GTK_WIDGET (win->delete_card_button), FALSE);
      return;
    }
  win->current_card = g_queue_pop_head (win->cards);
  gtk_label_set_label (win->card_title, win->current_card->title);
  gtk_widget_set_visible (GTK_WIDGET (win->delete_card_button), TRUE);
}

static void
load_cards (FlashcardsAppWindow *win, category c)
{
  GArray *card_array = database_load_cards (win->db, c.id);

  adw_view_stack_set_visible_child (win->main_view, win->flashcard);

  win->cards = g_queue_new ();
  for (guint i = 0; i < card_array->len; i++)
    {
      g_queue_push_tail (win->cards, &g_array_index (card_array, card, i));
    }

  next_card (win);
}

static void
on_select_category (__attribute__ ((unused)) GtkListBox *box,
                    GtkListBoxRow *row, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;

  adw_navigation_split_view_set_show_content (
      ADW_NAVIGATION_SPLIT_VIEW (win->split_view), TRUE);

  const int id = gtk_list_box_row_get_index (row);
  category c = g_array_index (win->categories, category, id);

  win->current_category = c;

  adw_window_title_set_subtitle (ADW_WINDOW_TITLE (win->title), c.name);

  adw_view_stack_set_visible_child (win->main_view, win->flashcard);

  gtk_widget_set_visible (GTK_WIDGET (win->add_card_button), TRUE);
  gtk_widget_set_visible (GTK_WIDGET (win->delete_category_button), TRUE);

  load_cards (win, c);
}

static void
on_add_category (__attribute__ ((unused)) GtkButton *self, gpointer user_data)
{
  FlashcardsCreateCategoryDialog *dialog
      = flashcards_create_category_dialog_new (user_data);
  adw_dialog_present (ADW_DIALOG (dialog), GTK_WIDGET (user_data));
}

static void
on_delete_category (__attribute__ ((unused)) GtkButton *self,
                    gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  database_delete_category (win->db, win->current_category.id);

  gtk_list_box_unselect_all (win->topics);

  adw_window_title_set_subtitle (ADW_WINDOW_TITLE (win->title), nullptr);
  adw_view_stack_set_visible_child (win->main_view, win->placeholder_category);
  gtk_widget_set_visible (GTK_WIDGET (win->add_card_button), FALSE);
  gtk_widget_set_visible (GTK_WIDGET (win->delete_card_button), FALSE);
  gtk_widget_set_visible (GTK_WIDGET (win->delete_category_button), FALSE);

  load_categories (win);
}

static void
on_add_card (__attribute__ ((unused)) GtkButton *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  FlashcardsCreateCardDialog *dialog = flashcards_create_card_dialog_new (win);
  adw_dialog_present (ADW_DIALOG (dialog), GTK_WIDGET (win));
}

static void
on_delete_card (__attribute__ ((unused)) GtkButton *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  database_delete_card (win->db, win->current_card->id);
  next_card (win);
}

static void
on_answer_easy (__attribute__ ((unused)) GtkButton *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  card *c = win->current_card;
  database_schedule_card (
      win->db, c->id, g_date_time_add_hours (g_date_time_new_now_utc (), 24));
  next_card (win);
}

static void
on_answer_medium (__attribute__ ((unused)) GtkButton *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  card *c = win->current_card;
  database_schedule_card (
      win->db, c->id, g_date_time_add_hours (g_date_time_new_now_utc (), 12));
  next_card (win);
}

static void
on_answer_hard (__attribute__ ((unused)) GtkButton *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  card *c = win->current_card;
  database_schedule_card (
      win->db, c->id, g_date_time_add_hours (g_date_time_new_now_utc (), 6));
  next_card (win);
}

static void
on_flip_card (__attribute__ ((unused)) GtkWidget *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;
  gtk_label_set_text (GTK_LABEL (win->card_title), win->current_card->answer);
}

void
flashcards_app_window_add_card (FlashcardsAppWindow *win, const gchar *title,
                                const gchar *answer)
{
  database_save_card (win->db, win->current_category.id, title, answer);
  load_cards (win, win->current_category);
}

void
flashcards_app_window_add_category (FlashcardsAppWindow *win,
                                    const gchar *title)
{
  database_save_category (win->db, title);
  load_categories (win);
}

static void
on_flashcards_app_window_show (GtkWidget *self, gpointer user_data)
{
  FlashcardsAppWindow *win = user_data;

  load_categories (win);
  gtk_list_box_unselect_all (win->topics);
}

static void
flashcards_app_window_init (FlashcardsAppWindow *self)
{
  gtk_widget_init_template (GTK_WIDGET (self));
  self->db = database_connect (g_get_user_data_dir ());
}

static void
flashcards_app_window_class_init (FlashcardsAppWindowClass *class)
{
  gtk_widget_class_set_template_from_resource (
      GTK_WIDGET_CLASS (class), "/li/sopht/flashcards/window.ui");

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, title);

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, add_card_button);
  gtk_widget_class_bind_template_child (
      GTK_WIDGET_CLASS (class), FlashcardsAppWindow, delete_card_button);
  gtk_widget_class_bind_template_child (
      GTK_WIDGET_CLASS (class), FlashcardsAppWindow, delete_category_button);

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, split_view);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, sidebar);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, content);

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, main_view);
  gtk_widget_class_bind_template_child (
      GTK_WIDGET_CLASS (class), FlashcardsAppWindow, placeholder_category);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, placeholder_card);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, flashcard);

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, topics);

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class),
                                        FlashcardsAppWindow, card_title);

  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_flashcards_app_window_show);

  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_select_category);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_add_category);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_delete_category);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_add_card);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_delete_card);

  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_answer_easy);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_answer_medium);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_answer_hard);

  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class),
                                           on_flip_card);
}

FlashcardsAppWindow *
flashcards_app_window_new (FlashcardsApp *app)
{
  return g_object_new (FLASHCARDS_APP_WINDOW_TYPE, "application", app, NULL);
}