/**

 * @file

 * Postponed Emails Functions

 *

 * @authors

 * Copyright (C) 2022-2023 Richard Russon <rich@flatcap.org>

 * Copyright (C) 2023 Dennis Schön <mail@dennis-schoen.de>

 *

 * @copyright

 * This program 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 2 of the License, or (at your option) any later

 * version.

 *

 * This program 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

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 */

/**

 * @page postpone_functions Postponed Emails Functions

 *

 * Postponed Emails Functions

 */

#include "config.h"

#ifdef _MAKEDOC

#include "docs/makedoc_defs.h"

#else

#include <stddef.h>

#include "mutt/lib.h"

#include "config/lib.h"

#include "core/lib.h"

#include "gui/lib.h"

#include "mutt.h"

#include "key/lib.h"

#include "menu/lib.h"

#include "pattern/lib.h"

#include "functions.h"

#include "mview.h"

#include "protos.h"

#endif

// clang-format off

/**

 * OpPostponed - Functions for the Postpone Menu

 */

const struct MenuFuncOp OpPostponed[] = { /* map: postpone */

  { "exit",                          OP_EXIT },

  { "delete-entry",                  OP_DELETE },

  { "undelete-entry",                OP_UNDELETE },

  { NULL, 0 },

};

/**

 * PostponedDefaultBindings - Key bindings for the Postpone Menu

 */

const struct MenuOpSeq PostponedDefaultBindings[] = { /* map: postpone */

  { OP_DELETE,                             "d" },

  { OP_EXIT,                               "q" },

  { OP_UNDELETE,                           "u" },

  { 0, NULL },

};

// clang-format on

/**

 * op_delete - Delete the current entry - Implements ::postpone_function_t - @ingroup postpone_function_api

 */

static int op_delete(struct PostponeData *pd, int op)

{

  struct Menu *menu = pd->menu;

  struct MailboxView *mv = pd->mailbox_view;

  struct Mailbox *m = mv->mailbox;

  const int index = menu_get_index(menu);

  /* should deleted draft messages be saved in the trash folder? */

  mutt_set_flag(m, m->emails[index], MUTT_DELETE, (op == OP_DELETE), true);

  PostCount = m->msg_count - m->msg_deleted;

  const bool c_resolve = cs_subset_bool(NeoMutt->sub, "resolve");

  if (c_resolve && (index < (menu->max - 1)))

  {

    menu_set_index(menu, index + 1);

    if (index >= (menu->top + menu->page_len))

    {

      menu->top = index;

      menu_queue_redraw(menu, MENU_REDRAW_INDEX);

    }

  }

  else

  {

    menu_queue_redraw(menu, MENU_REDRAW_CURRENT);

  }

  return FR_SUCCESS;

}

/**

 * op_exit - Exit this menu - Implements ::postpone_function_t - @ingroup postpone_function_api

 */

static int op_exit(struct PostponeData *pd, int op)

{

  pd->done = true;

  return FR_SUCCESS;

}

/**

 * op_generic_select_entry - Select the current entry - Implements ::postpone_function_t - @ingroup postpone_function_api

 */

static int op_generic_select_entry(struct PostponeData *pd, int op)

{

  int index = menu_get_index(pd->menu);

  struct MailboxView *mv = pd->mailbox_view;

  struct Mailbox *m = mv->mailbox;

  pd->email = m->emails[index];

  pd->done = true;

  return FR_SUCCESS;

}

/**

 * op_search - Search for a regular expression - Implements ::postpone_function_t - @ingroup postpone_function_api

 */

static int op_search(struct PostponeData *pd, int op)

{

  SearchFlags flags = SEARCH_NO_FLAGS;

  switch (op)

  {

    case OP_SEARCH:

      flags |= SEARCH_PROMPT;

      pd->search_state->reverse = false;

      break;

    case OP_SEARCH_REVERSE:

      flags |= SEARCH_PROMPT;

      pd->search_state->reverse = true;

      break;

    case OP_SEARCH_NEXT:

      break;

    case OP_SEARCH_OPPOSITE:

      flags |= SEARCH_OPPOSITE;

      break;

  }

  int index = menu_get_index(pd->menu);

  struct MailboxView *mv = pd->mailbox_view;

  index = mutt_search_command(mv, pd->menu, index, pd->search_state, flags);

  if (index != -1)

    menu_set_index(pd->menu, index);

  return FR_SUCCESS;

}

// -----------------------------------------------------------------------------

/**

 * PostponeFunctions - All the NeoMutt functions that the Postpone supports

 */

static const struct PostponeFunction PostponeFunctions[] = {

  // clang-format off

  { OP_DELETE,                 op_delete },

  { OP_EXIT,                   op_exit },

  { OP_GENERIC_SELECT_ENTRY,   op_generic_select_entry },

  { OP_SEARCH,                 op_search },

  { OP_SEARCH_NEXT,            op_search },

  { OP_SEARCH_OPPOSITE,        op_search },

  { OP_SEARCH_REVERSE,         op_search },

  { OP_UNDELETE,               op_delete },

  { 0, NULL },

  // clang-format on

};

/**

 * postpone_function_dispatcher - Perform a Postpone function - Implements ::function_dispatcher_t - @ingroup dispatcher_api

 */

int postpone_function_dispatcher(struct MuttWindow *win, int op)

{

  // The Dispatcher may be called on any Window in the Dialog

  struct MuttWindow *dlg = dialog_find(win);

  if (!dlg || !dlg->wdata)

    return FR_ERROR;

  struct Menu *menu = dlg->wdata;

  struct PostponeData *pd = menu->mdata;

  int rc = FR_UNKNOWN;

  for (size_t i = 0; PostponeFunctions[i].op != OP_NULL; i++)

  {

    const struct PostponeFunction *fn = &PostponeFunctions[i];

    if (fn->op == op)

    {

      rc = fn->function(pd, op);

      break;

    }

  }

  if (rc == FR_UNKNOWN) // Not our function

    return rc;

  const char *result = dispatcher_get_retval_name(rc);

  mutt_debug(LL_DEBUG1, "Handled %s (%d) -> %s\n", opcodes_get_name(op), op, NONULL(result));

  return rc;

}

/**

 * postponed_get_mailbox_view - Extract the Mailbox from the Postponed Dialog

 * @param dlg Postponed Dialog

 * @retval ptr Mailbox view

 */

struct MailboxView *postponed_get_mailbox_view(struct MuttWindow *dlg)

{

  if (!dlg)

    return NULL;

  struct Menu *menu = dlg->wdata;

  struct PostponeData *pd = menu->mdata;

  if (!pd)

    return NULL;

  return pd->mailbox_view;

}