/* See LICENSE file for license and copyright information */

#include <girara/statusbar.h>
#include <girara/session.h>
#include <girara/settings.h>
#include <girara/utils.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <string.h>
#include <glib/gi18n.h>
#include <math.h>

#include "callbacks.h"
#include "links.h"
#include "zathura.h"
#include "render.h"
#include "document.h"
#include "utils.h"
#include "shortcuts.h"
#include "page-widget.h"
#include "page.h"
#include "adjustment.h"

gboolean
cb_destroy(GtkWidget* UNUSED(widget), zathura_t* zathura)
{
  if (zathura != NULL && zathura->document != NULL) {
    document_close(zathura, false);
  }

  gtk_main_quit();
  return TRUE;
}

void
cb_buffer_changed(girara_session_t* session)
{
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);

  zathura_t* zathura = session->global.data;

  char* buffer = girara_buffer_get(session);
  if (buffer != NULL) {
    girara_statusbar_item_set_text(session, zathura->ui.statusbar.buffer, buffer);
    free(buffer);
  } else {
    girara_statusbar_item_set_text(session, zathura->ui.statusbar.buffer, "");
  }
}

static void
update_visible_pages(zathura_t* zathura)
{
  const unsigned int number_of_pages = zathura_document_get_number_of_pages(zathura->document);

  for (unsigned int page_id = 0; page_id < number_of_pages; page_id++) {
    zathura_page_t* page = zathura_document_get_page(zathura->document, page_id);
    GtkWidget* page_widget = zathura_page_get_widget(zathura, page);
    ZathuraPage* zathura_page_widget = ZATHURA_PAGE(page_widget);

    if (page_is_visible(zathura->document, page_id) == true) {
      /* make page visible */
      if (zathura_page_get_visibility(page) == false) {
        zathura_page_set_visibility(page, true);
        zathura_page_widget_update_view_time(zathura_page_widget);
        zathura_renderer_page_cache_add(zathura->sync.render_thread, zathura_page_get_index(page));
      }

    } else {
      /* make page invisible */
      if (zathura_page_get_visibility(page) == true) {
        zathura_page_set_visibility(page, false);
        /* If a page becomes invisible, abort the render request. */
        zathura_page_widget_abort_render_request(zathura_page_widget);
      }

      /* reset current search result */
      girara_list_t* results = NULL;
      g_object_get(page_widget, "search-results", &results, NULL);
      if (results != NULL) {
        g_object_set(page_widget, "search-current", 0, NULL);
      }
    }
  }
}

void
cb_view_hadjustment_value_changed(GtkAdjustment* adjustment, gpointer data)
{
  zathura_t* zathura = data;
  if (zathura == NULL || zathura->document == NULL) {
    return;
  }

  /* Do nothing in index mode */
  if (girara_mode_get(zathura->ui.session) == zathura->modes.index) {
    return;
  }

  update_visible_pages(zathura);

  double position_x = zathura_adjustment_get_ratio(adjustment);
  double position_y = zathura_document_get_position_y(zathura->document);
  unsigned int page_id = position_to_page_number(zathura->document, position_x, position_y);

  zathura_document_set_position_x(zathura->document, position_x);
  zathura_document_set_position_y(zathura->document, position_y);
  zathura_document_set_current_page_number(zathura->document, page_id);

  statusbar_page_number_update(zathura);
}

void
cb_view_vadjustment_value_changed(GtkAdjustment* adjustment, gpointer data)
{
  zathura_t* zathura = data;
  if (zathura == NULL || zathura->document == NULL) {
    return;
  }

  /* Do nothing in index mode */
  if (girara_mode_get(zathura->ui.session) == zathura->modes.index) {
    return;
  }

  update_visible_pages(zathura);

  double position_x = zathura_document_get_position_x(zathura->document);
  double position_y = zathura_adjustment_get_ratio(adjustment);
  unsigned int page_id = position_to_page_number(zathura->document, position_x, position_y);

  zathura_document_set_position_x(zathura->document, position_x);
  zathura_document_set_position_y(zathura->document, position_y);
  zathura_document_set_current_page_number(zathura->document, page_id);

  statusbar_page_number_update(zathura);
}

static void
cb_view_adjustment_changed(GtkAdjustment* adjustment, zathura_t* zathura,
    bool width)
{
  /* Do nothing in index mode */
  if (girara_mode_get(zathura->ui.session) == zathura->modes.index) {
    return;
  }

  const zathura_adjust_mode_t adjust_mode =
    zathura_document_get_adjust_mode(zathura->document);

  /* Don't scroll, we're focusing the inputbar. */
  if (adjust_mode == ZATHURA_ADJUST_INPUTBAR) {
    return;
  }

  /* Save the viewport size */
  unsigned int size = (unsigned int)floor(gtk_adjustment_get_page_size(adjustment));
  if (width == true) {
    zathura_document_set_viewport_width(zathura->document, size);
  } else {
    zathura_document_set_viewport_height(zathura->document, size);
  }

  /* reset the adjustment, in case bounds have changed */
  const double ratio = width == true ?
    zathura_document_get_position_x(zathura->document) :
    zathura_document_get_position_x(zathura->document);
  zathura_adjustment_set_value_from_ratio(adjustment, ratio);
}

void
cb_view_hadjustment_changed(GtkAdjustment* adjustment, gpointer data)
{
  zathura_t* zathura = data;
  g_return_if_fail(zathura != NULL);

  cb_view_adjustment_changed(adjustment, zathura, true);
}

void
cb_view_vadjustment_changed(GtkAdjustment* adjustment, gpointer data)
{
  zathura_t* zathura = data;
  g_return_if_fail(zathura != NULL);

  cb_view_adjustment_changed(adjustment, zathura, false);
}

void
cb_refresh_view(GtkWidget* GIRARA_UNUSED(view), gpointer data)
{
  zathura_t* zathura = data;
  if (zathura == NULL || zathura->document == NULL) {
    return;
  }

  unsigned int page_id = zathura_document_get_current_page_number(zathura->document);
  zathura_page_t* page = zathura_document_get_page(zathura->document, page_id);
  if (page == NULL) {
    return;
  }

  GtkAdjustment* vadj = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
  GtkAdjustment* hadj = gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));

  double position_x = zathura_document_get_position_x(zathura->document);
  double position_y = zathura_document_get_position_y(zathura->document);

  zathura_adjustment_set_value_from_ratio(vadj, position_y);
  zathura_adjustment_set_value_from_ratio(hadj, position_x);

  statusbar_page_number_update(zathura);
}

void
cb_page_layout_value_changed(girara_session_t* session, const char* name, girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
{
  g_return_if_fail(value != NULL);
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);
  zathura_t* zathura = session->global.data;

  /* pages-per-row must not be 0 */
  if (g_strcmp0(name, "pages-per-row") == 0) {
    unsigned int pages_per_row = *((unsigned int*) value);
    if (pages_per_row == 0) {
      pages_per_row = 1;
      girara_setting_set(session, name, &pages_per_row);
      girara_notify(session, GIRARA_WARNING, _("'%s' must not be 0. Set to 1."), name);
      return;
    }
  }

  if (zathura->document == NULL) {
    /* no document has been openend yet */
    return;
  }

  unsigned int pages_per_row = 1;
  girara_setting_get(session, "pages-per-row", &pages_per_row);

  unsigned int first_page_column = 1;
  girara_setting_get(session, "first-page-column", &first_page_column);

  unsigned int page_padding = 1;
  girara_setting_get(zathura->ui.session, "page-padding", &page_padding);

  page_widget_set_mode(zathura, page_padding, pages_per_row, first_page_column);
  zathura_document_set_page_layout(zathura->document, page_padding, pages_per_row, first_page_column);
}

void
cb_index_row_activated(GtkTreeView* tree_view, GtkTreePath* path,
                       GtkTreeViewColumn* UNUSED(column), void* data)
{
  zathura_t* zathura = data;
  if (tree_view == NULL || zathura == NULL || zathura->ui.session == NULL) {
    return;
  }

  GtkTreeModel  *model;
  GtkTreeIter   iter;

  g_object_get(tree_view, "model", &model, NULL);

  if(gtk_tree_model_get_iter(model, &iter, path)) {
    zathura_index_element_t* index_element;
    gtk_tree_model_get(model, &iter, 2, &index_element, -1);

    if (index_element == NULL) {
      return;
    }

    sc_toggle_index(zathura->ui.session, NULL, NULL, 0);
    zathura_link_evaluate(zathura, index_element->link);
  }

  g_object_unref(model);
}

typedef enum zathura_link_action_e
{
  ZATHURA_LINK_ACTION_FOLLOW,
  ZATHURA_LINK_ACTION_DISPLAY
} zathura_link_action_t;

static bool
handle_link(GtkEntry* entry, girara_session_t* session,
            zathura_link_action_t action)
{
  g_return_val_if_fail(session != NULL, FALSE);
  g_return_val_if_fail(session->global.data != NULL, FALSE);

  zathura_t* zathura = session->global.data;
  bool eval = true;

  char* input = gtk_editable_get_chars(GTK_EDITABLE(entry), 0, -1);
  if (input == NULL || strlen(input) == 0) {
    eval = false;
  }

  int index = 0;
  if (eval == true) {
    index = atoi(input);
    if (index == 0 && g_strcmp0(input, "0") != 0) {
      girara_notify(session, GIRARA_WARNING, _("Invalid input '%s' given."), input);
      eval = false;
    }
    index = index - 1;
  }

  /* set pages to draw links */
  bool invalid_index = true;
  unsigned int number_of_pages = zathura_document_get_number_of_pages(zathura->document);
  for (unsigned int page_id = 0; page_id < number_of_pages; page_id++) {
    zathura_page_t* page = zathura_document_get_page(zathura->document, page_id);
    if (page == NULL || zathura_page_get_visibility(page) == false) {
      continue;
    }

    GtkWidget* page_widget = zathura_page_get_widget(zathura, page);
    g_object_set(page_widget, "draw-links", FALSE, NULL);

    if (eval == true) {
      zathura_link_t* link = zathura_page_widget_link_get(ZATHURA_PAGE(page_widget), index);

      if (link != NULL) {
        invalid_index = false;
        switch (action) {
          case ZATHURA_LINK_ACTION_FOLLOW:
            zathura_link_evaluate(zathura, link);
            break;
          case ZATHURA_LINK_ACTION_DISPLAY:
            zathura_link_display(zathura, link);
            break;
        }
      }
    }
  }

  if (eval == true && invalid_index == true) {
    girara_notify(session, GIRARA_WARNING, _("Invalid index '%s' given."), input);
  }

  g_free(input);

  return (eval == TRUE) ? TRUE : FALSE;
}

bool
cb_sc_follow(GtkEntry* entry, girara_session_t* session)
{
  return handle_link(entry, session, ZATHURA_LINK_ACTION_FOLLOW);
}

bool
cb_sc_display_link(GtkEntry* entry, girara_session_t* session)
{
  return handle_link(entry, session, ZATHURA_LINK_ACTION_DISPLAY);
}

static gboolean
file_monitor_reload(void* data)
{
  sc_reload((girara_session_t*) data, NULL, NULL, 0);
  return FALSE;
}

void
cb_file_monitor(GFileMonitor* monitor, GFile* file, GFile* UNUSED(other_file), GFileMonitorEvent event, girara_session_t* session)
{
  g_return_if_fail(monitor  != NULL);
  g_return_if_fail(file     != NULL);
  g_return_if_fail(session  != NULL);

  switch (event) {
    case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
    case G_FILE_MONITOR_EVENT_CREATED:
      g_main_context_invoke(NULL, file_monitor_reload, session);
      break;
    default:
      return;
  }
}

static gboolean
password_dialog(gpointer data)
{
  zathura_password_dialog_info_t* dialog = data;

  if (dialog != NULL) {
    girara_dialog(
      dialog->zathura->ui.session,
      "Incorrect password. Enter password:",
      true,
      NULL,
      (girara_callback_inputbar_activate_t) cb_password_dialog,
      dialog
    );
  }

  return FALSE;
}

bool
cb_password_dialog(GtkEntry* entry, zathura_password_dialog_info_t* dialog)
{
  if (entry == NULL || dialog == NULL) {
    goto error_ret;
  }

  if (dialog->path == NULL) {
    free(dialog);
    goto error_ret;
  }

  if (dialog->zathura == NULL) {
    goto error_free;
  }

  char* input = gtk_editable_get_chars(GTK_EDITABLE(entry), 0, -1);

  /* no or empty password: ask again */
  if (input == NULL || strlen(input) == 0) {
    if (input != NULL) {
      g_free(input);
    }

    gdk_threads_add_idle(password_dialog, dialog);
    return false;
  }

  /* try to open document again */
  if (document_open(dialog->zathura, dialog->path, input,
                    ZATHURA_PAGE_NUMBER_UNSPECIFIED) == false) {
    gdk_threads_add_idle(password_dialog, dialog);
  } else {
    g_free(dialog->path);
    free(dialog);
  }

  g_free(input);

  return true;

error_free:

  g_free(dialog->path);
  free(dialog);

error_ret:

  return false;
}

bool
cb_view_resized(GtkWidget* UNUSED(widget), GtkAllocation* UNUSED(allocation), zathura_t* zathura)
{
  if (zathura == NULL || zathura->document == NULL) {
    return false;
  }

  /* adjust the scale according to settings. If nothing needs to be resized,
     it does not trigger the resize event.

     The right viewport size is already in the document object, due to a
     previous call to adjustment_changed. We don't want to use the allocation in
     here, because we would have to subtract scrollbars, etc. */
  adjust_view(zathura);

  return false;
}

void
cb_setting_recolor_change(girara_session_t* session, const char* name,
                          girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
{
  g_return_if_fail(value != NULL);
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);
  g_return_if_fail(name != NULL);
  zathura_t* zathura = session->global.data;

  const bool bool_value = *((bool*) value);

  if (zathura->sync.render_thread != NULL && zathura_renderer_recolor_enabled(zathura->sync.render_thread) != bool_value) {
     zathura_renderer_enable_recolor(zathura->sync.render_thread, bool_value);
     render_all(zathura);
  }
}

void
cb_setting_recolor_keep_hue_change(girara_session_t* session, const char* name,
                                   girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
{
  g_return_if_fail(value != NULL);
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);
  g_return_if_fail(name != NULL);
  zathura_t* zathura = session->global.data;

  const bool bool_value = *((bool*) value);

  if (zathura->sync.render_thread != NULL && zathura_renderer_recolor_hue_enabled(zathura->sync.render_thread) != bool_value) {
     zathura_renderer_enable_recolor_hue(zathura->sync.render_thread, bool_value);
     render_all(zathura);
  }
}


bool
cb_unknown_command(girara_session_t* session, const char* input)
{
  g_return_val_if_fail(session != NULL, false);
  g_return_val_if_fail(session->global.data != NULL, false);
  g_return_val_if_fail(input != NULL, false);

  zathura_t* zathura = session->global.data;

  if (zathura->document == NULL) {
    return false;
  }

  /* check for number */
  const size_t size = strlen(input);
  for (size_t i = 0; i < size; i++) {
    if (g_ascii_isdigit(input[i]) == FALSE) {
      return false;
    }
  }

  zathura_jumplist_add(zathura);
  page_set(zathura, atoi(input) - 1);
  zathura_jumplist_add(zathura);

  return true;
}

void
cb_page_widget_text_selected(ZathuraPage* page, const char* text, void* data)
{
  g_return_if_fail(page != NULL);
  g_return_if_fail(text != NULL);
  g_return_if_fail(data != NULL);

  zathura_t* zathura = data;
  girara_mode_t mode = girara_mode_get(zathura->ui.session);
  if (mode != zathura->modes.normal && mode != zathura->modes.fullscreen) {
    return;
  }

  GdkAtom* selection = get_selection(zathura);

  /* copy to clipboard */
  if (selection != NULL) {
    gtk_clipboard_set_text(gtk_clipboard_get(*selection), text, -1);

    char* stripped_text = g_strdelimit(g_strdup(text), "\n\t\r\n", ' ');
    char* escaped_text = g_markup_printf_escaped(
        _("Copied selected text to clipboard: %s"), stripped_text);
    g_free(stripped_text);

    girara_notify(zathura->ui.session, GIRARA_INFO, "%s", escaped_text);
    g_free(escaped_text);
  }

  g_free(selection);
}

void
cb_page_widget_image_selected(ZathuraPage* page, GdkPixbuf* pixbuf, void* data)
{
  g_return_if_fail(page != NULL);
  g_return_if_fail(pixbuf != NULL);
  g_return_if_fail(data != NULL);

  zathura_t* zathura = data;
  GdkAtom* selection = get_selection(zathura);

  if (selection != NULL) {
    gtk_clipboard_set_image(gtk_clipboard_get(*selection), pixbuf);
  }

  g_free(selection);
}

void
cb_page_widget_link(ZathuraPage* page, void* data)
{
  g_return_if_fail(page != NULL);

  bool enter = (bool) data;

  GdkWindow* window = gtk_widget_get_parent_window(GTK_WIDGET(page));
  GdkCursor* cursor = gdk_cursor_new(enter == true ? GDK_HAND1 : GDK_LEFT_PTR);
  gdk_window_set_cursor(window, cursor);
  g_object_unref(cursor);
}