/*
   This file is part of darktable,
   Copyright (C) 2009-2021 darktable developers.

   darktable is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   darktable is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "common/film.h"
#include "common/collection.h"
#include "common/darktable.h"
#include "common/debug.h"
#include "common/dtpthread.h"
#include "common/image_cache.h"
#include "common/tags.h"
#include "control/conf.h"
#include "control/control.h"
#include "control/jobs.h"
#include "views/view.h"

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef USE_LUA
#include "lua/glist.h"
#include "lua/lua.h"
#endif
#ifdef GDK_WINDOWING_QUARTZ
#include "osx/osx.h"
#endif

void dt_film_init(dt_film_t *film)
{
  dt_pthread_mutex_init(&film->images_mutex, NULL);
  film->last_loaded = film->num_images = 0;
  film->dirname[0] = '\0';
  film->dir = NULL;
  film->id = -1;
  film->ref = 0;
}

void dt_film_cleanup(dt_film_t *film)
{
  dt_pthread_mutex_destroy(&film->images_mutex);
  if(film->dir)
  {
    g_dir_close(film->dir);
    film->dir = NULL;
  }
}

void dt_film_set_query(const int32_t id)
{
  /* enable film id filter and set film id */
  dt_conf_set_int("plugins/lighttable/collect/num_rules", 1);
  dt_conf_set_int("plugins/lighttable/collect/item0", 0);
  sqlite3_stmt *stmt;
  // clang-format off
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id, folder"
                              " FROM main.film_rolls"
                              " WHERE id = ?1", -1, &stmt, NULL);
  // clang-format on
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
  if(sqlite3_step(stmt) == SQLITE_ROW)
  {
    dt_conf_set_string("plugins/lighttable/collect/string0", (gchar *)sqlite3_column_text(stmt, 1));
  }
  sqlite3_finalize(stmt);
  dt_collection_update_query(darktable.collection, DT_COLLECTION_CHANGE_NEW_QUERY, DT_COLLECTION_PROP_UNDEF, NULL);
}

int32_t dt_film_get_id(const char *folder)
{
  int32_t filmroll_id = -1;
  sqlite3_stmt *stmt;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
#ifdef _WIN32
                              "SELECT id FROM main.film_rolls WHERE folder LIKE ?1",
#else
                              "SELECT id FROM main.film_rolls WHERE folder = ?1",
#endif
                              -1, &stmt, NULL);
  DT_DEBUG_SQLITE3_BIND_TEXT(stmt, 1, folder, -1, SQLITE_STATIC);
  if(sqlite3_step(stmt) == SQLITE_ROW) filmroll_id = sqlite3_column_int(stmt, 0);
  sqlite3_finalize(stmt);
  return filmroll_id;
}

/** open film with given id. */
int dt_film_open2(dt_film_t *film)
{
  /* check if we got a decent film id */
  if(film->id < 0) return 1;

  /* query database for id and folder */
  sqlite3_stmt *stmt;
  // clang-format off
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id, folder"
                              " FROM main.film_rolls"
                              " WHERE id = ?1", -1, &stmt, NULL);
  // clang-format on
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, film->id);
  if(sqlite3_step(stmt) == SQLITE_ROW)
  {
    /* fill out the film dirname */
    g_strlcpy(film->dirname, (gchar *)sqlite3_column_text(stmt, 1), sizeof(film->dirname));
    sqlite3_finalize(stmt);

    // clang-format off
    DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                "UPDATE main.film_rolls"
                                " SET access_timestamp = strftime('%s', 'now')"
                                " WHERE id = ?1", -1, &stmt,
                                NULL);
    // clang-format on
    DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, film->id);
    sqlite3_step(stmt);

    sqlite3_finalize(stmt);
    dt_film_set_query(film->id);
    dt_control_queue_redraw_center();
    dt_view_manager_reset(darktable.view_manager);
    return 0;
  }
  else
    sqlite3_finalize(stmt);

  /* failure */
  return 1;
}

int dt_film_open(const int32_t id)
{
  sqlite3_stmt *stmt;
  // clang-format off
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id, folder"
                              " FROM main.film_rolls"
                              " WHERE id = ?1", -1, &stmt, NULL);
  // clang-format on
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
  if(sqlite3_step(stmt) == SQLITE_ROW)
  {
    sqlite3_finalize(stmt);

    // clang-format off
    DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                "UPDATE main.film_rolls"
                                " SET access_timestamp = strftime('%s', 'now')"
                                " WHERE id = ?1", -1, &stmt,
                                NULL);
    // clang-format on
    DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
    sqlite3_step(stmt);
  }
  sqlite3_finalize(stmt);
  // TODO: prefetch to cache using image_open
  dt_film_set_query(id);
  dt_control_queue_redraw_center();
  dt_view_manager_reset(darktable.view_manager);
  return 0;
}

// FIXME: needs a rewrite
int dt_film_open_recent(const int num)
{
  sqlite3_stmt *stmt;
  // clang-format off
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id"
                              " FROM main.film_rolls"
                              " ORDER BY access_timestamp DESC LIMIT ?1,1", -1,
                              &stmt, NULL);
  // clang-format on
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, num);
  if(sqlite3_step(stmt) == SQLITE_ROW)
  {
    const int id = sqlite3_column_int(stmt, 0);
    sqlite3_finalize(stmt);
    if(dt_film_open(id)) return 1;
    // clang-format off
    DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                "UPDATE main.film_rolls"
                                " SET access_timestamp = strftime('%s', 'now')"
                                " WHERE id = ?1", -1, &stmt,
                                NULL);
    // clang-format on
    DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
    sqlite3_step(stmt);
  }
  sqlite3_finalize(stmt);
  // dt_control_update_recent_films();
  return 0;
}

int dt_film_new(dt_film_t *film, const char *directory)
{
  sqlite3_stmt *stmt;

  // Try open filmroll for folder if exists
  film->id = -1;
  g_strlcpy(film->dirname, directory, sizeof(film->dirname));

  // remove a closing '/', unless it's also the start
  char *last = &film->dirname[strlen(film->dirname) - 1];
  if(*last == '/' && last != film->dirname) *last = '\0';

  /* if we didn't find an id, lets instantiate a new filmroll */
  film->id = dt_film_get_id(film->dirname);

  /* if we didn't find an id, lets instantiate a new filmroll */
  if(film->id <= 0)
  {
    // create a new filmroll
    /* insert a new film roll into database */
    // clang-format off
    DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                "INSERT INTO main.film_rolls (id, access_timestamp, folder)"
                                "  VALUES (NULL, strftime('%s', 'now'), ?1)",
                                -1, &stmt, NULL);
    // clang-format on
    DT_DEBUG_SQLITE3_BIND_TEXT(stmt, 1, film->dirname, -1, SQLITE_STATIC);
    const int rc = sqlite3_step(stmt);
    if(rc != SQLITE_DONE)
      fprintf(stderr, "[film_new] failed to insert film roll! %s\n",
              sqlite3_errmsg(dt_database_get(darktable.db)));
    sqlite3_finalize(stmt);
    /* requery for filmroll and fetch new id */
    film->id = dt_film_get_id(film->dirname);
    if(film->id)
    {
      // add it to the table memory.film_folder
      sqlite3_stmt *stmt2;
      // clang-format off
      DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                  "INSERT INTO memory.film_folder (id, status) "
                                  "VALUES (?1, 1)",
                                  -1, &stmt2, NULL);
      // clang-format on
      DT_DEBUG_SQLITE3_BIND_INT(stmt2, 1, film->id);
      sqlite3_step(stmt2);
      sqlite3_finalize(stmt2);
    }
  }
#ifdef _WIN32
  else
  {
    // make sure we reuse the same path case
    // clang-format off
    DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                "SELECT folder FROM main.film_rolls WHERE id = ?1",
                                -1, &stmt, NULL);
    // clang-format on
    DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, film->id);
    if(sqlite3_step(stmt) != SQLITE_ROW)
      g_strlcpy(film->dirname, (const char *)sqlite3_column_text(stmt, 0), sizeof(film->dirname));
    sqlite3_finalize(stmt);
  }
#endif

  if(film->id <= 0) return 0;
  film->last_loaded = 0;
  return film->id;
}

int dt_film_import(const char *dirname)
{
  GError *error = NULL;

  /* initialize a film object*/
  dt_film_t *film = (dt_film_t *)malloc(sizeof(dt_film_t));
  dt_film_init(film);

  dt_film_new(film, dirname);

  /* bail out if we got troubles */
  if(film->id <= 0)
  {
    // if the film is empty => remove it again.
    if(dt_film_is_empty(film->id))
    {
      dt_film_remove(film->id);
    }
    dt_film_cleanup(film);
    free(film);
    return 0;
  }

  // when called without job system running the import will be done synchronously and destroy the film object
  const int filmid = film->id;

  /* at last put import film job on queue */
  film->last_loaded = 0;
  film->dir = g_dir_open(film->dirname, 0, &error);
  if(error)
  {
    fprintf(stderr, "[film_import] failed to open directory %s: %s\n", film->dirname, error->message);
    g_error_free(error);
    dt_film_cleanup(film);
    free(film);
    return 0;
  }

  // deselect all
  DT_DEBUG_SQLITE3_EXEC(dt_database_get(darktable.db), "DELETE FROM main.selected_images", NULL, NULL, NULL);

  // launch import job
  dt_control_add_job(darktable.control, DT_JOB_QUEUE_USER_BG, dt_film_import1_create(film));

  return filmid;
}

static gboolean ask_and_delete(gpointer user_data)
{
  GList *empty_dirs = (GList *)user_data;
  const int n_empty_dirs = g_list_length(empty_dirs);

  GtkWidget *dialog;
  GtkWidget *win = dt_ui_main_window(darktable.gui->ui);

  dialog = gtk_message_dialog_new(GTK_WINDOW(win), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION,
                                  GTK_BUTTONS_YES_NO,
                                  ngettext("do you want to remove this empty directory?",
                                           "do you want to remove these empty directories?", n_empty_dirs));
#ifdef GDK_WINDOWING_QUARTZ
  dt_osx_disallow_fullscreen(dialog);
#endif

  gtk_window_set_title(GTK_WINDOW(dialog),
                       ngettext("remove empty directory?", "remove empty directories?", n_empty_dirs));

  GtkWidget *content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog));

  GtkWidget *scroll = gtk_scrolled_window_new(NULL, NULL);
  gtk_widget_set_vexpand(scroll, TRUE);

  GtkListStore *store = gtk_list_store_new(1, G_TYPE_STRING);

  for(GList *list_iter = empty_dirs; list_iter; list_iter = g_list_next(list_iter))
  {
    GtkTreeIter iter;
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, 0, list_iter->data, -1);
  }

  GtkWidget *tree = gtk_tree_view_new_with_model(GTK_TREE_MODEL(store));
  gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(tree), FALSE);
  gtk_widget_set_name(GTK_WIDGET(tree), "delete-dialog");
  GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(_("name"), gtk_cell_renderer_text_new(),
                                                                       "text", 0, NULL);
  gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column);

  gtk_container_add(GTK_CONTAINER(scroll), tree);
  gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scroll), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
  gtk_scrolled_window_set_min_content_height(GTK_SCROLLED_WINDOW(scroll), DT_PIXEL_APPLY_DPI(25));

  gtk_container_add(GTK_CONTAINER(content_area), scroll);

  gtk_widget_show_all(dialog); // needed for the content area!

  const gint res = gtk_dialog_run(GTK_DIALOG(dialog));
  gtk_widget_destroy(dialog);
  if(res == GTK_RESPONSE_YES)
    for(GList *iter = empty_dirs; iter; iter = g_list_next(iter))
      rmdir((char *)iter->data);

  g_list_free_full(empty_dirs, g_free);
  g_object_unref(store);

  return FALSE;
}

void dt_film_remove_empty()
{
  // remove all empty film rolls from db:
  GList *empty_dirs = NULL;
  gboolean ask_before_rmdir = dt_conf_get_bool("ask_before_rmdir");
  gboolean raise_signal = FALSE;
  sqlite3_stmt *stmt;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id,folder"
                              " FROM main.film_rolls AS B"
                              " WHERE (SELECT COUNT(*)"
                              "        FROM main.images AS A"
                              "        WHERE A.film_id=B.id) = 0",
                              -1, &stmt, NULL);
  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    sqlite3_stmt *inner_stmt;
    raise_signal = TRUE;
    const gint id = sqlite3_column_int(stmt, 0);
    const gchar *folder = (const gchar *)sqlite3_column_text(stmt, 1);
    DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                                "DELETE FROM main.film_rolls WHERE id=?1", -1,
                                &inner_stmt, NULL);
    DT_DEBUG_SQLITE3_BIND_INT(inner_stmt, 1, id);
    sqlite3_step(inner_stmt);
    sqlite3_finalize(inner_stmt);

    if(dt_util_is_dir_empty(folder))
    {
      if(ask_before_rmdir) empty_dirs = g_list_prepend(empty_dirs, g_strdup(folder));
      else rmdir(folder);
    }
  }
  sqlite3_finalize(stmt);
  if(raise_signal) DT_DEBUG_CONTROL_SIGNAL_RAISE(darktable.signals, DT_SIGNAL_FILMROLLS_REMOVED);

  // dispatch asking for deletion (and subsequent deletion) to the gui thread
  if(empty_dirs)
    g_idle_add(ask_and_delete, g_list_reverse(empty_dirs));
}

gboolean dt_film_is_empty(const int id)
{
  gboolean empty = FALSE;
  sqlite3_stmt *stmt;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id FROM main.images WHERE film_id = ?1", -1,
                              &stmt, NULL);
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
  if(sqlite3_step(stmt) != SQLITE_ROW) empty = TRUE;
  sqlite3_finalize(stmt);
  return empty;
}

// This is basically the same as dt_image_remove() from common/image.c.
// It just does the iteration over all images in the SQL statement
void dt_film_remove(const int id)
{
  // only allowed if local copies have their original accessible

  sqlite3_stmt *stmt;

  gboolean remove_ok = TRUE;

  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id FROM main.images WHERE film_id = ?1", -1,
                              &stmt, NULL);
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);

  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    const int32_t imgid = sqlite3_column_int(stmt, 0);
    if(!dt_image_safe_remove(imgid))
    {
      remove_ok = FALSE;
      break;
    }
  }
  sqlite3_finalize(stmt);

  if(!remove_ok)
  {
    dt_control_log(_("cannot remove film roll having local copies with non accessible originals"));
    return;
  }

  // query is needed a second time for mipmap and image cache
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id FROM main.images WHERE film_id = ?1", -1,
                              &stmt, NULL);
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    const int32_t imgid = sqlite3_column_int(stmt, 0);
    dt_image_local_copy_reset(imgid);
    dt_mipmap_cache_remove(darktable.mipmap_cache, imgid);
    dt_image_cache_remove(darktable.image_cache, imgid);
  }
  sqlite3_finalize(stmt);

  // due to foreign keys, all images with references to the film roll are deleted,
  // and likewise all entries with references to those images
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "DELETE FROM main.film_rolls WHERE id = ?1", -1,
                              &stmt, NULL);
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, id);
  sqlite3_step(stmt);
  sqlite3_finalize(stmt);
  // dt_control_update_recent_films();

  DT_DEBUG_CONTROL_SIGNAL_RAISE(darktable.signals, DT_SIGNAL_FILMROLLS_CHANGED);
}

GList *dt_film_get_image_ids(const int filmid)
{
  GList *result = NULL;
  sqlite3_stmt *stmt;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id FROM main.images WHERE film_id = ?1",
                              -1, &stmt, NULL);
  DT_DEBUG_SQLITE3_BIND_INT(stmt, 1, filmid);
  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    const int id = sqlite3_column_int(stmt, 0);
    result = g_list_prepend(result, GINT_TO_POINTER(id));
  }
  sqlite3_finalize(stmt);
  return g_list_reverse(result);  // list was built in reverse order, so un-reverse it
}

void dt_film_set_folder_status()
{
  sqlite3_stmt *stmt, *stmt2;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "DELETE FROM memory.film_folder",
                              -1, &stmt, NULL);
  sqlite3_step(stmt);
  sqlite3_finalize(stmt);

  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT id, folder FROM main.film_rolls",
                              -1, &stmt, NULL);

  // clang-format off
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "INSERT INTO memory.film_folder (id, status) "
                              "VALUES (?1, ?2)",
                              -1, &stmt2, NULL);
  // clang-format on

  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    const int filmid = sqlite3_column_int(stmt, 0);
    const char *folder = (char *)sqlite3_column_text(stmt, 1);
    const int status = g_file_test(folder, G_FILE_TEST_IS_DIR);
    DT_DEBUG_SQLITE3_BIND_INT(stmt2, 1, filmid);
    DT_DEBUG_SQLITE3_BIND_INT(stmt2, 2, status);
    sqlite3_step(stmt2);
    sqlite3_reset(stmt2);
  }
  sqlite3_finalize(stmt);
  sqlite3_finalize(stmt2);
}

// clang-format off
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on

