/**
 * @file
 * Alias 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 alias_functions Alias functions
 *
 * Alias functions
 */

#include "config.h"
#ifdef _MAKEDOC
#include "docs/makedoc_defs.h"
#else
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "gui/lib.h"
#include "mutt.h"
#include "lib.h"
#include "editor/lib.h"
#include "history/lib.h"
#include "key/lib.h"
#include "menu/lib.h"
#include "pattern/lib.h"
#include "question/lib.h"
#include "alias.h"
#include "functions.h"
#include "gui.h"
#include "sort.h"
#endif

// clang-format off
/**
 * OpAlias - Functions for the Alias Menu
 */
const struct MenuFuncOp OpAlias[] = { /* map: alias */
  { "delete-entry",                  OP_DELETE },
  { "exit",                          OP_EXIT },
  { "limit",                         OP_MAIN_LIMIT },
  { "mail",                          OP_MAIL },
  { "sort-alias",                    OP_SORT },
  { "sort-alias-reverse",            OP_SORT_REVERSE },
  { "tag-pattern",                   OP_MAIN_TAG_PATTERN },
  { "undelete-entry",                OP_UNDELETE },
  { "untag-pattern",                 OP_MAIN_UNTAG_PATTERN },
  { NULL, 0 },
};

/**
 * OpQuery - Functions for the external Query Menu
 */
const struct MenuFuncOp OpQuery[] = { /* map: query */
  { "create-alias",                  OP_CREATE_ALIAS },
  { "exit",                          OP_EXIT },
  { "limit",                         OP_MAIN_LIMIT },
  { "mail",                          OP_MAIL },
  { "query",                         OP_QUERY },
  { "query-append",                  OP_QUERY_APPEND },
  { "sort",                          OP_SORT },
  { "sort-reverse",                  OP_SORT_REVERSE },
  { "tag-pattern",                   OP_MAIN_TAG_PATTERN },
  { "untag-pattern",                 OP_MAIN_UNTAG_PATTERN },
  { NULL, 0 },
};

/**
 * AliasDefaultBindings - Key bindings for the Alias Menu
 */
const struct MenuOpSeq AliasDefaultBindings[] = { /* map: alias */
  { OP_DELETE,                             "d" },
  { OP_EXIT,                               "q" },
  { OP_MAIL,                               "m" },
  { OP_MAIN_LIMIT,                         "l" },
  { OP_MAIN_TAG_PATTERN,                   "T" },
  { OP_MAIN_UNTAG_PATTERN,                 "\024" },           // <Ctrl-T>
  { OP_SORT,                               "o" },
  { OP_SORT_REVERSE,                       "O" },
  { OP_TAG,                                "<space>" },
  { OP_UNDELETE,                           "u" },
  { 0, NULL },
};

/**
 * QueryDefaultBindings - Key bindings for the external Query Menu
 */
const struct MenuOpSeq QueryDefaultBindings[] = { /* map: query */
  { OP_CREATE_ALIAS,                       "a" },
  { OP_EXIT,                               "q" },
  { OP_MAIL,                               "m" },
  { OP_MAIN_LIMIT,                         "l" },
  { OP_MAIN_TAG_PATTERN,                   "T" },
  { OP_MAIN_UNTAG_PATTERN,                 "\024" },           // <Ctrl-T>
  { OP_QUERY,                              "Q" },
  { OP_QUERY_APPEND,                       "A" },
  { OP_SORT,                               "o" },
  { OP_SORT_REVERSE,                       "O" },
  { OP_TAG,                                "<space>" },
  { 0, NULL },
};
// clang-format on

/**
 * op_create_alias - create an alias from a message sender - Implements ::alias_function_t - @ingroup alias_function_api
 */
static int op_create_alias(struct AliasMenuData *mdata, int op)
{
  struct Menu *menu = mdata->menu;

  if (menu->tag_prefix)
  {
    struct AddressList naddr = TAILQ_HEAD_INITIALIZER(naddr);

    struct AliasView *avp = NULL;
    ARRAY_FOREACH(avp, &mdata->ava)
    {
      if (!avp->is_tagged)
        continue;

      struct AddressList al = TAILQ_HEAD_INITIALIZER(al);
      if (alias_to_addrlist(&al, avp->alias))
      {
        mutt_addrlist_copy(&naddr, &al, false);
        mutt_addrlist_clear(&al);
      }
    }

    alias_create(&naddr, mdata->sub);
    mutt_addrlist_clear(&naddr);
  }
  else
  {
    struct AddressList al = TAILQ_HEAD_INITIALIZER(al);
    if (alias_to_addrlist(&al, ARRAY_GET(&mdata->ava, menu_get_index(menu))->alias))
    {
      alias_create(&al, mdata->sub);
      mutt_addrlist_clear(&al);
    }
  }
  return FR_SUCCESS;
}

/**
 * op_delete - delete the current entry - Implements ::alias_function_t - @ingroup alias_function_api
 */
static int op_delete(struct AliasMenuData *mdata, int op)
{
  struct Menu *menu = mdata->menu;

  if (menu->tag_prefix)
  {
    struct AliasView *avp = NULL;
    ARRAY_FOREACH(avp, &mdata->ava)
    {
      if (avp->is_tagged)
        avp->is_deleted = (op == OP_DELETE);
    }
    menu_queue_redraw(menu, MENU_REDRAW_INDEX);
  }
  else
  {
    int index = menu_get_index(menu);
    ARRAY_GET(&mdata->ava, index)->is_deleted = (op == OP_DELETE);
    menu_queue_redraw(menu, MENU_REDRAW_CURRENT);
    const bool c_resolve = cs_subset_bool(mdata->sub, "resolve");
    if (c_resolve && (index < (menu->max - 1)))
    {
      menu_set_index(menu, index + 1);
      menu_queue_redraw(menu, MENU_REDRAW_INDEX);
    }
  }
  return FR_SUCCESS;
}

/**
 * op_exit - exit this menu - Implements ::alias_function_t - @ingroup alias_function_api
 */
static int op_exit(struct AliasMenuData *mdata, int op)
{
  return FR_DONE;
}

/**
 * op_generic_select_entry - select the current entry - Implements ::alias_function_t - @ingroup alias_function_api
 *
 * This function handles:
 * - OP_GENERIC_SELECT_ENTRY
 * - OP_MAIL
 *
 * @note AliasMenuData.is_tagged will show the user's selection
 */
static int op_generic_select_entry(struct AliasMenuData *mdata, int op)
{
  struct Menu *menu = mdata->menu;
  if (menu->tag_prefix)
  {
    // Untag any non-visible aliases
    struct AliasView *avp = NULL;
    ARRAY_FOREACH(avp, &mdata->ava)
    {
      if (avp->is_tagged && !avp->is_visible)
        avp->is_tagged = false;
    }
  }
  else
  {
    // Untag all but the current alias
    struct AliasView *avp = NULL;
    const int idx = menu_get_index(menu);
    ARRAY_FOREACH(avp, &mdata->ava)
    {
      avp->is_tagged = (ARRAY_FOREACH_IDX_avp == idx);
    }
  }

  return FR_CONTINUE;
}

/**
 * op_main_limit - show only messages matching a pattern - Implements ::alias_function_t - @ingroup alias_function_api
 */
static int op_main_limit(struct AliasMenuData *mdata, int op)
{
  struct Menu *menu = mdata->menu;
  int rc = mutt_pattern_alias_func(_("Limit to addresses matching: "), mdata,
                                   PAA_VISIBLE, menu);
  if (rc != 0)
    return FR_NO_ACTION;

  alias_array_sort(&mdata->ava, mdata->sub);
  alias_set_title(mdata->sbar, mdata->title, mdata->limit);
  menu_queue_redraw(menu, MENU_REDRAW_FULL);
  window_redraw(NULL);

  return FR_SUCCESS;
}

/**
 * op_main_tag_pattern - Tag messages matching a pattern - Implements ::alias_function_t - @ingroup alias_function_api
 */
static int op_main_tag_pattern(struct AliasMenuData *mdata, int op)
{
  struct Menu *menu = mdata->menu;
  int rc = mutt_pattern_alias_func(_("Tag addresses matching: "), mdata, PAA_TAG, menu);
  if (rc != 0)
    return FR_NO_ACTION;

  menu_queue_redraw(menu, MENU_REDRAW_FULL);
  window_redraw(NULL);

  return FR_SUCCESS;
}

/**
 * op_main_untag_pattern - Untag messages matching a pattern - Implements ::alias_function_t - @ingroup alias_function_api
 */
static int op_main_untag_pattern(struct AliasMenuData *mdata, int op)
{
  struct Menu *menu = mdata->menu;
  int rc = mutt_pattern_alias_func(_("Untag addresses matching: "), mdata, PAA_UNTAG, menu);
  if (rc != 0)
    return FR_NO_ACTION;

  menu_queue_redraw(menu, MENU_REDRAW_FULL);
  window_redraw(NULL);

  return FR_SUCCESS;
}

/**
 * op_query - query external program for addresses - Implements ::alias_function_t - @ingroup alias_function_api
 *
 * This function handles:
 * - OP_QUERY
 * - OP_QUERY_APPEND
 */
static int op_query(struct AliasMenuData *mdata, int op)
{
  struct Buffer *buf = mdata->query;
  if ((mw_get_field(_("Query: "), buf, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) != 0) ||
      buf_is_empty(buf))
  {
    return FR_NO_ACTION;
  }

  if (op == OP_QUERY)
  {
    ARRAY_FREE(&mdata->ava);
    aliaslist_clear(mdata->al);
  }

  struct Menu *menu = mdata->menu;
  struct AliasList al = TAILQ_HEAD_INITIALIZER(al);

  query_run(buf_string(buf), true, &al, mdata->sub);
  menu_queue_redraw(menu, MENU_REDRAW_FULL);
  char title[256] = { 0 };
  snprintf(title, sizeof(title), "%s%s", _("Query: "), buf_string(buf));
  sbar_set_title(mdata->sbar, title);

  if (TAILQ_EMPTY(&al))
  {
    if (op == OP_QUERY)
      menu->max = 0;
    return FR_NO_ACTION;
  }

  struct Alias *np = NULL;
  struct Alias *tmp = NULL;
  TAILQ_FOREACH_SAFE(np, &al, entries, tmp)
  {
    alias_array_alias_add(&mdata->ava, np);
    TAILQ_REMOVE(&al, np, entries);
    TAILQ_INSERT_TAIL(mdata->al, np, entries); // Transfer
  }
  alias_array_sort(&mdata->ava, mdata->sub);
  menu->max = ARRAY_SIZE(&mdata->ava);
  return FR_SUCCESS;
}

/**
 * op_search - search for a regular expression - Implements ::alias_function_t - @ingroup alias_function_api
 *
 * This function handles:
 * - OP_SEARCH
 * - OP_SEARCH_NEXT
 * - OP_SEARCH_OPPOSITE
 * - OP_SEARCH_REVERSE
 */
static int op_search(struct AliasMenuData *mdata, int op)
{
  SearchFlags flags = SEARCH_NO_FLAGS;
  switch (op)
  {
    case OP_SEARCH:
      flags |= SEARCH_PROMPT;
      mdata->search_state->reverse = false;
      break;
    case OP_SEARCH_REVERSE:
      flags |= SEARCH_PROMPT;
      mdata->search_state->reverse = true;
      break;
    case OP_SEARCH_NEXT:
      break;
    case OP_SEARCH_OPPOSITE:
      flags |= SEARCH_OPPOSITE;
      break;
  }

  struct Menu *menu = mdata->menu;
  int index = menu_get_index(menu);
  index = mutt_search_alias_command(menu, index, mdata->search_state, flags);
  if (index == -1)
    return FR_NO_ACTION;

  menu_set_index(menu, index);
  return FR_SUCCESS;
}

/**
 * op_sort - sort aliases - Implements ::alias_function_t - @ingroup alias_function_api
 *
 * This function handles:
 * - OP_SORT
 * - OP_SORT_REVERSE
 */
static int op_sort(struct AliasMenuData *mdata, int op)
{
  int sort = cs_subset_sort(mdata->sub, "alias_sort");
  bool resort = true;
  bool reverse = (op == OP_SORT_REVERSE);

  switch (mw_multi_choice(reverse ?
                              /* L10N: The highlighted letters must match the "Sort" options */
                              _("Rev-Sort (a)lias, (n)ame, (e)mail or (u)nsorted?") :
                              /* L10N: The highlighted letters must match the "Rev-Sort" options */
                              _("Sort (a)lias, (n)ame, (e)mail or (u)nsorted?"),
                          /* L10N: These must match the highlighted letters from "Sort" and "Rev-Sort" */
                          _("aneu")))
  {
    case -1: /* abort */
      resort = false;
      break;

    case 1: /* (a)lias */
      sort = ALIAS_SORT_ALIAS;
      break;

    case 2: /* (n)ame */
      sort = ALIAS_SORT_NAME;
      break;

    case 3: /* (e)mail */
      sort = ALIAS_SORT_EMAIL;
      break;

    case 4: /* (u)nsorted */
      sort = ALIAS_SORT_UNSORTED;
      break;
  }

  if (resort)
  {
    sort |= reverse ? SORT_REVERSE : 0;

    // This will trigger a WA_RECALC
    cs_subset_str_native_set(mdata->sub, "alias_sort", sort, NULL);
  }

  return FR_SUCCESS;
}

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

/**
 * AliasFunctions - All the NeoMutt functions that the Alias supports
 */
static const struct AliasFunction AliasFunctions[] = {
  // clang-format off
  { OP_CREATE_ALIAS,           op_create_alias },
  { OP_DELETE,                 op_delete },
  { OP_EXIT,                   op_exit },
  { OP_GENERIC_SELECT_ENTRY,   op_generic_select_entry },
  { OP_MAIL,                   op_generic_select_entry },
  { OP_MAIN_LIMIT,             op_main_limit },
  { OP_MAIN_TAG_PATTERN,       op_main_tag_pattern },
  { OP_MAIN_UNTAG_PATTERN,     op_main_untag_pattern },
  { OP_QUERY,                  op_query },
  { OP_QUERY_APPEND,           op_query },
  { OP_SEARCH,                 op_search },
  { OP_SEARCH_NEXT,            op_search },
  { OP_SEARCH_OPPOSITE,        op_search },
  { OP_SEARCH_REVERSE,         op_search },
  { OP_SORT,                   op_sort },
  { OP_SORT_REVERSE,           op_sort },
  { OP_UNDELETE,               op_delete },
  { 0, NULL },
  // clang-format on
};

/**
 * alias_function_dispatcher - Perform a Alias function - Implements ::function_dispatcher_t - @ingroup dispatcher_api
 */
int alias_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 AliasMenuData *mdata = menu->mdata;

  int rc = FR_UNKNOWN;
  for (size_t i = 0; AliasFunctions[i].op != OP_NULL; i++)
  {
    const struct AliasFunction *fn = &AliasFunctions[i];
    if (fn->op == op)
    {
      rc = fn->function(mdata, 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;
}