/**

 * @file

 * Compose Attachments

 *

 * @authors

 * Copyright (C) 2021 Richard Russon <rich@flatcap.org>

 *

 * @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 compose_attach Attachments window

 *

 * The Compose Attachments Window displays the attachments of an email.

 *

 * ## Windows

 *

 * | Name                       | Type      | See Also     |

 * | :------------------------- | :-------- | :----------- |

 * | Compose Attachments Window | WT_MENU   | attach_new() |

 *

 * **Parent**

 * - @ref compose_dialog

 *

 * **Children**

 *

 * None.

 *

 * ## Data

 * - #ComposeAttachData

 *

 * The Compose Attachments Window stores its data (#ComposeAttachData) in

 * Menu::mdata.

 *

 * ## Events

 *

 * Once constructed, it is controlled by the following events:

 *

 * | Event Type            | Handler                   |

 * | :-------------------- | :------------------------ |

 * | #NT_CONFIG            | attach_config_observer()  |

 * | #NT_EMAIL             | attach_email_observer()   |

 * | #NT_WINDOW            | attach_window_observer()  |

 */

#include "config.h"

#include <stddef.h>

#include <stdbool.h>

#include <stdint.h>

#include "private.h"

#include "mutt/lib.h"

#include "config/lib.h"

#include "email/lib.h"

#include "core/lib.h"

#include "gui/lib.h"

#include "attach/lib.h"

#include "convert/lib.h"

#include "menu/lib.h"

#include "attach_data.h"

#include "format_flags.h"

#include "muttlib.h"

#include "shared_data.h"

/**

 * cum_attachs_size - Cumulative Attachments Size

 * @param sub   Config Subset

 * @param adata Attachment data

 * @retval num Bytes in attachments

 *

 * Returns the total number of bytes used by the attachments in the attachment

 * list _after_ content-transfer-encodings have been applied.

 */

unsigned long cum_attachs_size(struct ConfigSubset *sub, struct ComposeAttachData *adata)

{

  if (!adata || !adata->actx)

    return 0;

  size_t s = 0;

  struct Content *info = NULL;

  struct Body *b = NULL;

  struct AttachCtx *actx = adata->actx;

  struct AttachPtr **idx = actx->idx;

  for (unsigned short i = 0; i < actx->idxlen; i++)

  {

    b = idx[i]->body;

    if (!b->content)

      b->content = mutt_get_content_info(b->filename, b, sub);

    info = b->content;

    if (info)

    {

      switch (b->encoding)

      {

        case ENC_QUOTED_PRINTABLE:

          s += 3 * (info->lobin + info->hibin) + info->ascii + info->crlf;

          break;

        case ENC_BASE64:

          s += (4 * (info->lobin + info->hibin + info->ascii + info->crlf)) / 3;

          break;

        default:

          s += info->lobin + info->hibin + info->ascii + info->crlf;

          break;

      }

    }

  }

  return s;

}

/**

 * attach_email_observer - Notification that the Email has changed - Implements ::observer_t - @ingroup observer_api

 */

static int attach_email_observer(struct NotifyCallback *nc)

{

  if (nc->event_type != NT_EMAIL)

    return 0;

  if (!nc->global_data)

    return -1;

  if (nc->event_subtype != NT_EMAIL_CHANGE_ATTACH)

    return 0;

  struct MuttWindow *win_attach = nc->global_data;

  win_attach->actions |= WA_RECALC;

  mutt_debug(LL_DEBUG5, "compose done, request WA_RECALC\n");

  return 0;

}

/**

 * attach_config_observer - Notification that a Config Variable has changed - Implements ::observer_t - @ingroup observer_api

 */

int attach_config_observer(struct NotifyCallback *nc)

{

  if (nc->event_type != NT_CONFIG)

    return 0;

  if (!nc->global_data || !nc->event_data)

    return -1;

  struct EventConfig *ev_c = nc->event_data;

  if (!mutt_str_equal(ev_c->name, "attach_format"))

    return 0;

  struct MuttWindow *win_attach = nc->global_data;

  win_attach->actions |= WA_RECALC;

  mutt_debug(LL_DEBUG5, "config, request WA_RECALC\n");

  return 0;

}

/**

 * attach_window_observer - Notification that a Window has changed - Implements ::observer_t - @ingroup observer_api

 */

static int attach_window_observer(struct NotifyCallback *nc)

{

  if (nc->event_type != NT_WINDOW)

    return 0;

  if (!nc->global_data || !nc->event_data)

    return -1;

  struct MuttWindow *win_attach = nc->global_data;

  struct EventWindow *ev_w = nc->event_data;

  if (ev_w->win != win_attach)

    return 0;

  if (nc->event_subtype == NT_WINDOW_STATE)

  {

    win_attach->actions |= WA_RECALC;

    mutt_debug(LL_DEBUG5, "window state done, request WA_RECALC\n");

  }

  else if (nc->event_subtype == NT_WINDOW_DELETE)

  {

    struct Menu *menu = win_attach->wdata;

    struct ComposeAttachData *adata = menu->mdata;

    struct AttachCtx *actx = adata->actx;

    notify_observer_remove(actx->email->notify, attach_email_observer, win_attach);

    notify_observer_remove(NeoMutt->notify, attach_config_observer, win_attach);

    notify_observer_remove(win_attach->notify, attach_window_observer, win_attach);

    mutt_debug(LL_DEBUG5, "window delete done\n");

  }

  return 0;

}

/**

 * compose_attach_tag - Tag an attachment - Implements Menu::tag() - @ingroup menu_tag

 */

static int compose_attach_tag(struct Menu *menu, int sel, int act)

{

  struct ComposeAttachData *adata = menu->mdata;

  struct AttachCtx *actx = adata->actx;

  struct Body *cur = actx->idx[actx->v2r[sel]]->body;

  bool ot = cur->tagged;

  cur->tagged = ((act >= 0) ? act : !cur->tagged);

  return cur->tagged - ot;

}

/**

 * compose_make_entry - Format a menu item for the attachment list - Implements Menu::make_entry() - @ingroup menu_make_entry

 *

 * @sa $attach_format, attach_format_str()

 */

static void compose_make_entry(struct Menu *menu, char *buf, size_t buflen, int line)

{

  struct ComposeAttachData *adata = menu->mdata;

  struct AttachCtx *actx = adata->actx;

  struct ComposeSharedData *shared = menu->win->parent->wdata;

  struct ConfigSubset *sub = shared->sub;

  const char *const c_attach_format = cs_subset_string(sub, "attach_format");

  mutt_expando_format(buf, buflen, 0, menu->win->state.cols, NONULL(c_attach_format),

                      attach_format_str, (intptr_t) (actx->idx[actx->v2r[line]]),

                      MUTT_FORMAT_STAT_FILE | MUTT_FORMAT_ARROWCURSOR);

}

/**

 * attach_new - Create the Attachments Menu

 * @param parent Parent Window

 * @param shared Shared compose data

 */

struct MuttWindow *attach_new(struct MuttWindow *parent, struct ComposeSharedData *shared)

{

  struct MuttWindow *win_attach = menu_window_new(MENU_COMPOSE, NeoMutt->sub);

  struct ComposeAttachData *adata = attach_data_new(shared->email);

  shared->adata = adata;

  // NT_COLOR is handled by the Menu Window

  notify_observer_add(NeoMutt->notify, NT_CONFIG, attach_config_observer, win_attach);

  notify_observer_add(shared->email->notify, NT_EMAIL, attach_email_observer, win_attach);

  notify_observer_add(win_attach->notify, NT_WINDOW, attach_window_observer, win_attach);

  struct Menu *menu = win_attach->wdata;

  menu->page_len = win_attach->state.rows;

  menu->win = win_attach;

  menu->make_entry = compose_make_entry;

  menu->tag = compose_attach_tag;

  menu->mdata = adata;

  menu->mdata_free = attach_data_free;

  adata->menu = menu;

  return win_attach;

}