/*
 *      Copyright (C) 2005-2013 Team XBMC
 *      http://xbmc.org
 *
 *  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, 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 XBMC; see the file COPYING.  If not, see
 *  <http://www.gnu.org/licenses/>.
 *
 */

#include "MythDirectory.h"
#include "MythSession.h"
#include "utils/URIUtils.h"
#include "DllLibCMyth.h"
#include "video/VideoInfoTag.h"
#include "URL.h"
#include "settings/AdvancedSettings.h"
#include "settings/Settings.h"
#include "FileItem.h"
#include "utils/StringUtils.h"
#include "guilib/LocalizeStrings.h"
#include "utils/log.h"
#include "DirectoryCache.h"
#include "utils/TimeUtils.h"

extern "C"
{
#include "cmyth/include/cmyth/cmyth.h"
#include "cmyth/include/refmem/refmem.h"
}

using namespace XFILE;
using namespace std;

CMythDirectory::CMythDirectory()
{
  m_session  = NULL;
  m_dll      = NULL;
  m_database = NULL;
  m_recorder = NULL;
}

CMythDirectory::~CMythDirectory()
{
  Release();
}

DIR_CACHE_TYPE CMythDirectory::GetCacheType(const CURL& url) const
{
  std::string fileName = url.GetFileName();
  URIUtils::RemoveSlashAtEnd(fileName);

  /*
   * Always cache "All Recordings", "Guide" (top folder only), "Movies", and "TV Shows" (including
   * sub folders).
   *
   * Entire directory cache for myth:// is invalidated when the root directory is requested to
   * ensure content is always up-to-date.
   */
  if (fileName == "recordings"
  ||  fileName == "guide"
  ||  fileName == "movies"
  ||  StringUtils::StartsWith(fileName, "tvshows"))
    return DIR_CACHE_ALWAYS;

  return DIR_CACHE_ONCE;
}

void CMythDirectory::Release()
{
  if (m_recorder)
  {
    m_dll->ref_release(m_recorder);
    m_recorder = NULL;
  }
  if (m_session)
  {
    CMythSession::ReleaseSession(m_session);
    m_session = NULL;
  }
  m_dll = NULL;
}

bool CMythDirectory::GetGuide(const std::string& base, CFileItemList &items)
{
  cmyth_database_t db = m_session->GetDatabase();
  if (!db)
    return false;

  cmyth_chanlist_t list = m_dll->mysql_get_chanlist(db);
  if (!list)
  {
    CLog::Log(LOGERROR, "%s - Unable to get list of channels: %s", __FUNCTION__, base.c_str());
    return false;
  }
  CURL url(base);

  int count = m_dll->chanlist_get_count(list);
  for (int i = 0; i < count; i++)
  {
    cmyth_channel_t channel = m_dll->chanlist_get_item(list, i);
    if (channel)
    {
      if (!m_dll->channel_visible(channel))
      {
        m_dll->ref_release(channel);
        continue;
      }

      int channum = m_dll->channel_channum(channel); // e.g. 3
      std::string name = GetValue(m_dll->channel_name(channel)); // e.g. TV3
      if (channum <= 0)
      {
        CLog::Log(LOGDEBUG, "%s - Skipping channel number %d as <= 0: %s", __FUNCTION__, channum, name.c_str());
        m_dll->ref_release(channel);
        continue;
      }

      CLog::Log(LOGDEBUG, "%s - Adding channel number %d: %s", __FUNCTION__, channum, name.c_str());

      std::string number = StringUtils::Format("%d", channum); // std::string easier for string manipulation than int.
      url.SetFileName("guide/" + number);
      CFileItemPtr item(new CFileItem(url.Get(), true));
      item->m_strTitle = number;
      if (!name.empty())
        item->m_strTitle += " - " + name; // e.g. 3 - TV3

      std::string icon = GetValue(m_dll->channel_icon(channel));
      if (!icon.empty())
      {
        url.SetFileName("files/channels/" + URIUtils::GetFileName(icon)); // e.g. files/channels/tv3.jpg
        item->SetArt("thumb", url.Get());
      }

      items.Add(item);

      m_dll->ref_release(channel);
    }
  }

  items.AddSortMethod(SortByLabel, 551 /* Name */, LABEL_MASKS("", "", "%K", ""));

  m_dll->ref_release(list);
  return true;
}

bool CMythDirectory::GetGuideForChannel(const std::string& base, CFileItemList &items, int channelNumber)
{
  cmyth_database_t database = m_session->GetDatabase();
  if (!database)
  {
    CLog::Log(LOGERROR, "%s - Could not get database", __FUNCTION__);
    return false;
  }

  time_t now;
  time(&now);
  time_t end = now + (24 * 60 * 60); // How many seconds of EPG from now we should grab, 24 hours in seconds

  cmyth_program_t *program = NULL;
  // TODO: See if there is a way to just get the entries for the chosen channel rather than ALL
  int count = m_dll->mysql_get_guide(database, &program, now, end);
  CLog::Log(LOGDEBUG, "%s - %i entries in guide data", __FUNCTION__, count);
  if (count <= 0)
    return false;

  for (int i = 0; i < count; i++)
  {
    if (program[i].channum == channelNumber)
    {
      CFileItemPtr item(new CFileItem("", false)); // No path for guide entries

      /*
       * Set the FileItem meta data.
       */
      std::string title        = program[i].title; // e.g. Mythbusters
      std::string subtitle     = program[i].subtitle; // e.g. The Pirate Special
      CDateTime localstart;
      if (program[i].starttime)
        localstart = CTimeUtils::GetLocalTime(program[i].starttime);
      item->m_strTitle = StringUtils::Format("%s - %s",
                                             localstart.GetAsLocalizedTime("HH:mm", false).c_str(),
                                             title.c_str()); // e.g. 20:30 - Mythbusters
      if (!subtitle.empty())
        item->m_strTitle     += " - \"" + subtitle + "\""; // e.g. 20:30 - Mythbusters - "The Pirate Special"
      item->m_dateTime        = localstart;

      /*
       * Set the VideoInfoTag meta data so it matches the FileItem meta data where possible.
       */
      CVideoInfoTag* tag      = item->GetVideoInfoTag();
      tag->m_strTitle         = title;
      if (!subtitle.empty())
        tag->m_strTitle      += " - \"" + subtitle + "\""; // e.g. Mythbusters - "The Pirate Special"
      tag->m_strShowTitle     = title;
      tag->m_strOriginalTitle = title;
      tag->m_strPlotOutline   = subtitle;
      tag->m_strPlot          = program[i].description;
      // TODO: Strip out the subtitle from the description if it is present at the start?
      // TODO: Do we need to add the subtitle to the start of the plot if not already as it used to? Seems strange, should be handled by skin?
      tag->m_genre            = StringUtils::Split(program[i].category, g_advancedSettings.m_videoItemSeparator); // e.g. Sports
      tag->m_strAlbum         = program[i].callsign; // e.g. TV3

      CDateTime start(program[i].starttime);
      CDateTime end(program[i].endtime);
      CDateTimeSpan runtime = end - start;
      tag->m_duration         = runtime.GetSeconds() + runtime.GetMinutes() * 60 + runtime.GetHours() * 3600;
      tag->m_iSeason          = 0; // So XBMC treats the content as an episode and displays tag information.
      tag->m_iEpisode         = 0;

      items.Add(item);
    }
  }

  /*
   * Items are sorted as added to the list (in ascending date order). Specifying sorting by date can
   * result in the guide being shown in the wrong order for skins that sort by date in descending
   * order by default with no option to change to ascending, e.g. Confluence.
   */
  items.AddSortMethod(SortByNone, 552 /* Date */, LABEL_MASKS("%K", "%J")); // Still leave the date label

  m_dll->ref_release(program);
  return true;
}

bool CMythDirectory::GetRecordings(const std::string& base, CFileItemList &items, enum FilterType type,
                                    const std::string& filter)
{
  cmyth_proglist_t list = m_session->GetAllRecordedPrograms();
  if (!list)
  {
    CLog::Log(LOGERROR, "%s - unable to get list of recordings", __FUNCTION__);
    return false;
  }

  int count = m_dll->proglist_get_count(list);
  for (int i = 0; i < count; i++)
  {
    cmyth_proginfo_t program = m_dll->proglist_get_item(list, i);
    if (program)
    {
      if (!IsVisible(program))
      {
        m_dll->ref_release(program);
        continue;
      }

      CURL url(base);
      /*
       * The base is the URL used to connect to the master server. The hostname in this may not
       * appropriate for all items as MythTV supports multiple backends (master + slaves).
       *
       * The appropriate host for playback is contained in the program information sent back from
       * the master. The same username and password are used in the URL as for the master.
       */
      url.SetHostName(GetValue(m_dll->proginfo_host(program)));

      std::string path = URIUtils::GetFileName(GetValue(m_dll->proginfo_pathname(program)));
      std::string name = GetValue(m_dll->proginfo_title(program));

      switch (type)
      {
      case MOVIES:
        if (!IsMovie(program))
        {
          m_dll->ref_release(program);
          continue;
        }
        url.SetFileName("movies/" + path);
        break;
      case TV_SHOWS:
        if (!StringUtils::EqualsNoCase(filter, name))
        {
          m_dll->ref_release(program);
          continue;
        }
        url.SetFileName("tvshows/" + name + "/" + path);
        break;
      case ALL:
        url.SetFileName("recordings/" + path);
        break;
      }

      CFileItemPtr item(new CFileItem(url.Get(), false));
      m_session->SetFileItemMetaData(*item, program);

      /*
       * If MOVIES, set the label and specify as pre-formatted so any scraper lookup will use the
       * label rather than the filename. Don't set as pre-formatted for any other types as this
       * prevents the display of the title changing depending on what the list is being sorted by.
       */
      if (type == MOVIES)
      {
        /*
         * Adding the production year, if available, to the label for Movies to aid in scraper
         * lookups.
         */
        std::string label(item->m_strTitle);
        unsigned short year = m_dll->proginfo_year(program);
        if (year > 0)
          label += StringUtils::Format(" (%d)", year);
        item->SetLabel(label);
        item->SetLabelPreformated(true);
      }

      items.Add(item);
      m_dll->ref_release(program);
    }
  }
  m_dll->ref_release(list);

  /*
   * Don't sort by name for TV_SHOWS as they all have the same name, so only date sort is useful.
   * Since the subtitle has been added to the TV Show name, the video sort title sort is used so
   * the subtitle doesn't influence the sort order and they are sorted by date.
   */
  if (type != TV_SHOWS)
    items.AddSortMethod(SortBySortTitle, 556 /* Name */, LABEL_MASKS("%K", "%J"), CSettings::Get().GetBool("filelists.ignorethewhensorting") ? SortAttributeIgnoreArticle : SortAttributeNone);
  items.AddSortMethod(SortByDate, 552 /* Date */, LABEL_MASKS("%K", "%J"));

  return true;
}

/**
 * \brief Gets a list of folders for recorded TV shows
 */
bool CMythDirectory::GetTvShowFolders(const std::string& base, CFileItemList &items)
{
  cmyth_proglist_t list = m_session->GetAllRecordedPrograms();
  if (!list)
  {
    CLog::Log(LOGERROR, "%s - unable to get list of recordings", __FUNCTION__);
    return false;
  }

  int count = m_dll->proglist_get_count(list);
  for (int i = 0; i < count; i++)
  {
    cmyth_proginfo_t program = m_dll->proglist_get_item(list, i);
    if (program)
    {
      if (!IsVisible(program))
      {
        m_dll->ref_release(program);
        continue;
      }

      if (!IsTvShow(program))
      {
        m_dll->ref_release(program);
        continue;
      }

      std::string title = GetValue(m_dll->proginfo_title(program));
      std::string path = base + "/" + title + "/";

      /*
       * Only add each TV show once. If the TV show is already in the list, update the date for the
       * folder to be the date of the last recorded TV show as the programs are returned in the
       * order they were recorded.
       */
      if (items.Contains(path))
      {
        CFileItemPtr item = items.Get(path);
        item->m_dateTime = GetValue(m_dll->proginfo_rec_start(program));
      }
      else
      {
        CFileItemPtr item(new CFileItem(path, true));
        item->m_dateTime = GetValue(m_dll->proginfo_rec_start(program));
        item->SetLabel(title);
        items.Add(item);
      }
      m_dll->ref_release(program);
    }

  }
  m_dll->ref_release(list);

  items.AddSortMethod(SortByLabel, 551 /* Name */, LABEL_MASKS("", "", "%L", "%J"), CSettings::Get().GetBool("filelists.ignorethewhensorting") ? SortAttributeIgnoreArticle : SortAttributeNone);
  items.AddSortMethod(SortByDate, 552 /* Date */, LABEL_MASKS("", "", "%L", "%J"));

  return true;
}

bool CMythDirectory::GetChannels(const std::string& base, CFileItemList &items)
{
  cmyth_conn_t control = m_session->GetControl();
  if (!control)
    return false;

  vector<cmyth_proginfo_t> channels;
  for (unsigned i = 0; i < 16; i++)
  {
    cmyth_recorder_t recorder = m_dll->conn_get_recorder_from_num(control, i);
    if (!recorder)
      continue;

    cmyth_proginfo_t program;
    program = m_dll->recorder_get_cur_proginfo(recorder);
    program = m_dll->recorder_get_next_proginfo(recorder, program, BROWSE_DIRECTION_UP);
    if (!program)
    {
      m_dll->ref_release(m_recorder);
      continue;
    }

    long startchan = m_dll->proginfo_chan_id(program);
    long currchan  = -1;
    while (startchan != currchan)
    {
      unsigned j;
      for (j = 0; j < channels.size(); j++)
      {
        if (m_dll->proginfo_compare(program, channels[j]) == 0)
          break;
      }

      if (j == channels.size())
        channels.push_back(program);

      program = m_dll->recorder_get_next_proginfo(recorder, program, BROWSE_DIRECTION_UP);
      if (!program)
        break;

      currchan = m_dll->proginfo_chan_id(program);
    }
    m_dll->ref_release(recorder);
  }

  CURL url(base);
  /*
   * The content of the cmyth_proginfo_t struct retrieved and stored in channels[] above does not
   * contain the host so the URL cannot be modified to support both master and slave servers.
   */

  for (unsigned i = 0; i < channels.size(); i++)
  {
    cmyth_proginfo_t program = channels[i];

    url.SetFileName("channels/" + GetValue(m_dll->proginfo_chanstr(program)) + ".ts"); // e.g. 3.ts
    CFileItemPtr item(new CFileItem(url.Get(), false));
    m_session->SetFileItemMetaData(*item, program);

    items.Add(item);
    m_dll->ref_release(program);
  }

  items.AddSortMethod(SortByLabel, 551 /* Name */, LABEL_MASKS("%K", "%B"));

  /*
   * Video sort title is set to the channel number.
   */
  items.AddSortMethod(SortBySortTitle, 556 /* Title */, LABEL_MASKS("%K", "%B"), CSettings::Get().GetBool("filelists.ignorethewhensorting") ? SortAttributeIgnoreArticle : SortAttributeNone);

  return true;
}

bool CMythDirectory::GetDirectory(const CURL& url, CFileItemList &items)
{
  m_session = CMythSession::AquireSession(url);
  if (!m_session)
    return false;

  m_dll = m_session->GetLibrary();
  if (!m_dll)
    return false;

  std::string base(url.Get());
  URIUtils::RemoveSlashAtEnd(base);

  std::string fileName = url.GetFileName();
  URIUtils::RemoveSlashAtEnd(fileName);

  if (fileName == "")
  {
    /*
     * If we can't get the control then we can't connect to the backend. Don't even show any of the
     * virtual folders as none of them will work. Without this check the "Browse" functionality
     * when adding a myth:// source is way confusing as it shows folders so it looks like it has
     * connected successfully when it in fact hasn't.
     */
    cmyth_conn_t control = m_session->GetControl();
    if (!control)
      return false;

    CFileItemPtr item;

    item.reset(new CFileItem(base + "/recordings/", true));
    item->SetLabel(g_localizeStrings.Get(22015)); // All recordings
    items.Add(item);

    item.reset(new CFileItem(base + "/tvshows/", true));
    item->SetLabel(g_localizeStrings.Get(20343)); // TV shows
    items.Add(item);

    item.reset(new CFileItem(base + "/movies/", true));
    item->SetLabel(g_localizeStrings.Get(20342)); // Movies
    items.Add(item);

    item.reset(new CFileItem(base + "/channels/", true));
    item->SetLabel(g_localizeStrings.Get(22018)); // Live channels
    items.Add(item);

    item.reset(new CFileItem(base + "/guide/", true));
    item->SetLabel(g_localizeStrings.Get(22020)); // Guide
    items.Add(item);

    items.AddSortMethod(SortByNone, 564 /* Type */, LABEL_MASKS("", "", "%L", "")); // No sorting, as added to list.

    /*
     * Clear the directory cache so the cached sub-folders are guaranteed to be accurate.
     */
    g_directoryCache.ClearSubPaths(base);

    return true;
  }
  else if (fileName == "channels")
    return GetChannels(base, items);
  else if (fileName == "guide")
    return GetGuide(base, items);
  else if (StringUtils::StartsWith(fileName, "guide/"))
    return GetGuideForChannel(base, items, atoi(fileName.substr(6).c_str()));
  else if (fileName == "movies")
    return GetRecordings(base, items, MOVIES);
  else if (fileName == "recordings")
    return GetRecordings(base, items);
  else if (fileName == "tvshows")
    return GetTvShowFolders(base, items);
  else if (StringUtils::StartsWith(fileName, "tvshows/"))
    return GetRecordings(base, items, TV_SHOWS, fileName.substr(8).c_str());
  return false;
}

bool CMythDirectory::Exists(const CURL& url)
{
  /*
   * Return true for any virtual folders that are known to exist. Don't check for explicit
   * existence using GetDirectory() as most methods will return true with empty content due to the
   * way they are implemented - by iterating over all programs and filtering out content.
   */
  std::string fileName = url.GetFileName();
  URIUtils::RemoveSlashAtEnd(fileName);

  if (fileName == ""
  ||  fileName == "channels"
  ||  fileName == "guide"
  ||  StringUtils::StartsWith(fileName, "guide/")
  ||  fileName == "movies"
  ||  fileName == "recordings"
  ||  fileName == "tvshows"
  ||  StringUtils::StartsWith(fileName, "tvshows/"))
    return true;

  return false;
}

bool CMythDirectory::IsVisible(const cmyth_proginfo_t program)
{
  std::string group = GetValue(m_dll->proginfo_recgroup(program));
  unsigned long flags = m_dll->proginfo_flags(program);

  /*
   * Ignore programs that were recorded using "LiveTV" or that have been deleted via the
   * "Auto Expire Instead of Delete Recording" option, which places the recording in the
   * "Deleted" recording group for x days rather than deleting straight away.
   *
   * As of 0.24, when a recording is deleted using the Myth Protocol it is marked as "pending delete"
   * using the program flags mask. It is then scheduled to be physically deleted in a detached
   * thread. This means that a deleted recording can still appear in the list of all recordings.
   * Recordings that are "pending delete" will have a program flag mask that matches
   * FL_DELETEPENDING = 0x00000080.
   */
  return !(StringUtils::EqualsNoCase(group, "LiveTV") ||
           StringUtils::EqualsNoCase(group, "Deleted") || flags & 0x00000080);
}

bool CMythDirectory::IsMovie(const cmyth_proginfo_t program)
{
  /*
   * The mythconverg.recordedprogram.programid field (if it exists) is a combination key where the first 2 characters map
   * to the category_type and the rest is the key. From MythTV/release-0-21-fixes/mythtv/libs/libmythtv/programinfo.cpp
   * "MV" = movie
   * "EP" = series
   * "SP" = sports
   * "SH" = tvshow
   *
   * Based on MythTV usage it appears that the programid is only filled in for Movies though. Shame, could have used
   * it for the other categories as well.
   *
   * mythconverg.recordedprogram.category_type contains the exact information that is needed. However, category_type
   * isn't available through the libcmyth API. Since there is a direct correlation between the programid starting
   * with "MV" and the category_type being "movie" that should work fine.
   */

  const int iMovieLength = g_advancedSettings.m_iMythMovieLength; // Minutes
  if (iMovieLength > 0) // Use hack to identify movie based on length (used if EPG is dubious).
    return StringUtils::StartsWith(GetValue(m_dll->proginfo_programid(program)), "MV")
        || m_dll->proginfo_length_sec(program) > iMovieLength * 60; // Minutes to seconds
  else
    return StringUtils::StartsWith(GetValue(m_dll->proginfo_programid(program)), "MV");
}

bool CMythDirectory::IsTvShow(const cmyth_proginfo_t program)
{
  /*
   * There isn't enough information exposed by libcmyth to distinguish between an episode in a series and a
   * one off TV show. See comment in IsMovie for more information.
   *
   * Return anything that isn't a movie as per any advanced setting override. This may result in a
   * recorded TV Show only being shown in the Movies directory if it's something like a double
   * episode.
   */
  return !IsMovie(program);
}

bool CMythDirectory::SupportsWriteFileOperations(const std::string& strPath)
{
  CURL url(strPath);
  std::string filename = url.GetFileName();
  URIUtils::RemoveSlashAtEnd(filename);
  /*
   * TV Shows directory has sub-folders so extra check is included so only files get the file
   * operations.
   */
  return StringUtils::StartsWith(filename, "recordings/") ||
         StringUtils::StartsWith(filename, "movies/") ||
        (StringUtils::StartsWith(filename, "tvshows/") && URIUtils::HasExtension(filename));
}

bool CMythDirectory::IsLiveTV(const std::string& strPath)
{
  CURL url(strPath);
  return StringUtils::StartsWith(url.GetFileName(), "channels/");
}
