// Copyright (c) 2026 Gordon Bolton. MIT License.

/**
 * DownloadMatcher - Matches download client data to Sonarr/Radarr activity.
 * Contains logic for matching SABnzbd slots and qBittorrent torrents to media metadata
 * via download IDs and title matching.
 */

const { mapTorrentToDownload } = require('../utils/qbittorrent');
const TagMatcher = require('./TagMatcher');
const DownloadAssembler = require('./DownloadAssembler');

/**
 * Builds a Map of series metadata from Sonarr queue and history records.
 * @param {Array} queueRecords - Sonarr queue records
 * @param {Array} historyRecords - Sonarr history records
 * @returns {Map} Map of seriesId to series object
 */
function buildSeriesMapFromRecords(queueRecords, historyRecords) {
  const seriesMap = new Map();
  for (const r of queueRecords) {
    if (r.series && r.seriesId) seriesMap.set(r.seriesId, r.series);
  }
  for (const r of historyRecords) {
    if (r.series && r.seriesId && !seriesMap.has(r.seriesId)) seriesMap.set(r.seriesId, r.series);
  }
  return seriesMap;
}

/**
 * Builds a Map of movie metadata from Radarr queue and history records.
 * @param {Array} queueRecords - Radarr queue records
 * @param {Array} historyRecords - Radarr history records
 * @returns {Map} Map of movieId to movie object
 */
function buildMoviesMapFromRecords(queueRecords, historyRecords) {
  const moviesMap = new Map();
  for (const r of queueRecords) {
    if (r.movie && r.movieId) moviesMap.set(r.movieId, r.movie);
  }
  for (const r of historyRecords) {
    if (r.movie && r.movieId && !moviesMap.has(r.movieId)) moviesMap.set(r.movieId, r.movie);
  }
  return moviesMap;
}

/**
 * Determines the status and speed for a SABnzbd slot based on queue state.
 * @param {Object} slot - SABnzbd queue slot
 * @param {string} queueStatus - Overall queue status (e.g., 'Paused')
 * @param {string} queueSpeed - Queue speed string
 * @param {string} queueKbpersec - Queue speed in KB/s
 * @returns {Object} Object with status and speed properties
 */
function getSlotStatusAndSpeed(slot, queueStatus, queueSpeed, queueKbpersec) {
  if (queueStatus === 'Paused') {
    return { status: 'Paused', speed: '0' };
  }
  return {
    status: slot.status || 'Unknown',
    speed: queueSpeed || queueKbpersec || '0'
  };
}

/**
 * Matches SABnzbd queue slots to Sonarr/Radarr activity using download IDs and title matching.
 * @param {Array} slots - SABnzbd queue slots
 * @param {Object} context - Matching context with records, maps, and user info
 * @returns {Array} Array of matched download objects
 */
function matchSabSlots(slots, context) {
  const {
    sonarrQueueRecords,
    sonarrHistoryRecords,
    radarrQueueRecords,
    radarrHistoryRecords,
    seriesMap,
    moviesMap,
    sonarrTagMap,
    radarrTagMap,
    username,
    isAdmin,
    showAll,
    embyUserMap,
    queueStatus,
    queueSpeed,
    queueKbpersec
  } = context;

  const matched = [];
  for (const slot of slots) {
    const nzbName = slot.filename || slot.nzbname;
    if (!nzbName) continue;

    const slotState = getSlotStatusAndSpeed(slot, queueStatus, queueSpeed, queueKbpersec);
    const nzbNameLower = nzbName.toLowerCase();

    // Normalize SAB name (dots to spaces) for better matching
    const nzbNameNormalized = nzbNameLower.replace(/\./g, ' ');

    // Try to match by downloadId first (most reliable)
    const sabDownloadId = slot.nzo_id || slot.id;
    let sonarrMatch = sabDownloadId ? sonarrQueueRecords.find(r => r.downloadId === sabDownloadId) : null;
    let radarrMatch = sabDownloadId ? radarrQueueRecords.find(r => r.downloadId === sabDownloadId) : null;

    // Also check HISTORY by downloadId
    if (!sonarrMatch && sabDownloadId) {
      sonarrMatch = sonarrHistoryRecords.find(r => r.downloadId === sabDownloadId);
    }
    if (!radarrMatch && sabDownloadId) {
      radarrMatch = radarrHistoryRecords.find(r => r.downloadId === sabDownloadId);
    }

    // Fallback: Check by title matching
    if (!sonarrMatch) {
      sonarrMatch = sonarrQueueRecords.find(r => {
        const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
        return rTitle && (
          rTitle.includes(nzbNameLower) || nzbNameLower.includes(rTitle) ||
          rTitle.includes(nzbNameNormalized) || nzbNameNormalized.includes(rTitle)
        );
      });
    }
    if (!radarrMatch) {
      radarrMatch = radarrQueueRecords.find(r => {
        const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
        return rTitle && (
          rTitle.includes(nzbNameLower) || nzbNameLower.includes(rTitle) ||
          rTitle.includes(nzbNameNormalized) || nzbNameNormalized.includes(rTitle)
        );
      });
    }

    // Also check HISTORY (completed downloads) if no queue match
    if (!sonarrMatch) {
      sonarrMatch = sonarrHistoryRecords.find(r => {
        const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
        return rTitle && (
          rTitle.includes(nzbNameLower) || nzbNameLower.includes(rTitle) ||
          rTitle.includes(nzbNameNormalized) || nzbNameNormalized.includes(rTitle)
        );
      });
    }
    if (!radarrMatch) {
      radarrMatch = radarrHistoryRecords.find(r => {
        const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
        return rTitle && (
          rTitle.includes(nzbNameLower) || nzbNameLower.includes(rTitle) ||
          rTitle.includes(nzbNameNormalized) || nzbNameNormalized.includes(rTitle)
        );
      });
    }

    if (sonarrMatch && sonarrMatch.seriesId) {
      const series = seriesMap.get(sonarrMatch.seriesId) || sonarrMatch.series;
      if (series) {
        const allTags = TagMatcher.extractAllTags(series.tags, sonarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(series.tags, sonarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          // Calculate progress from SABnzbd slot data
          const mbValue = slot.mb !== undefined && slot.mb !== null ? parseFloat(slot.mb) : 0;
          const mbLeftValue = (slot.mbleft !== undefined && slot.mbleft !== null) || (slot.mbmissing !== undefined && slot.mbmissing !== null)
            ? parseFloat(slot.mbleft || slot.mbmissing)
            : 0;
          const progress = mbValue > 0 ? ((mbValue - mbLeftValue) / mbValue) * 100 : 0;

          const dlObj = {
            type: 'series',
            title: nzbName,
            coverArt: DownloadAssembler.getCoverArt(series),
            status: slotState.status,
            progress: Math.round(progress),
            mb: slot.mb,
            mbmissing: slot.mbleft,
            size: Math.round(slot.mb * 1024 * 1024),
            speed: Math.round((slot.kbpersec || 0) * 1024),
            eta: slot.timeleft,
            seriesName: series.title,
            episodes: DownloadAssembler.gatherEpisodes(nzbNameLower, sonarrQueueRecords),
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined,
            client: 'sabnzbd',
            instanceId: slot.instanceId || 'sabnzbd-default',
            instanceName: slot.instanceName || 'SABnzbd'
          };
          const issues = DownloadAssembler.getImportIssues(sonarrMatch);
          if (issues) dlObj.importIssues = issues;
          if (isAdmin) {
            dlObj.downloadPath = slot.storage || null;
            dlObj.targetPath = series.path || null;
            dlObj.arrLink = DownloadAssembler.getSonarrLink(series);
            dlObj.arrQueueId = sonarrMatch.id;
            dlObj.arrType = 'sonarr';
            dlObj.arrInstanceUrl = sonarrMatch._instanceUrl || null;
            dlObj.arrInstanceKey = sonarrMatch._instanceKey || null;
            dlObj.arrContentId = sonarrMatch.episodeId || null;
            dlObj.arrContentType = 'episode';
          }
          dlObj.canBlocklist = DownloadAssembler.canBlocklist(dlObj, isAdmin);
          matched.push(dlObj);
        }
      }
    }

    if (radarrMatch && radarrMatch.movieId) {
      const movie = moviesMap.get(radarrMatch.movieId) || radarrMatch.movie;
      if (movie) {
        const allTags = TagMatcher.extractAllTags(movie.tags, radarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(movie.tags, radarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          // Calculate progress from SABnzbd slot data
          const mbValue = slot.mb !== undefined && slot.mb !== null ? parseFloat(slot.mb) : 0;
          const mbLeftValue = (slot.mbleft !== undefined && slot.mbleft !== null) || (slot.mbmissing !== undefined && slot.mbmissing !== null)
            ? parseFloat(slot.mbleft || slot.mbmissing)
            : 0;
          const progress = mbValue > 0 ? ((mbValue - mbLeftValue) / mbValue) * 100 : 0;

          const dlObj = {
            type: 'movie',
            title: nzbName,
            coverArt: DownloadAssembler.getCoverArt(movie),
            status: slotState.status,
            progress: Math.round(progress),
            mb: slot.mb,
            mbmissing: slot.mbleft,
            size: Math.round(slot.mb * 1024 * 1024),
            speed: Math.round((slot.kbpersec || 0) * 1024),
            eta: slot.timeleft,
            movieName: movie.title,
            movieInfo: radarrMatch,
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined,
            client: 'sabnzbd',
            instanceId: slot.instanceId || 'sabnzbd-default',
            instanceName: slot.instanceName || 'SABnzbd'
          };
          const issues = DownloadAssembler.getImportIssues(radarrMatch);
          if (issues) dlObj.importIssues = issues;
          if (isAdmin) {
            dlObj.downloadPath = slot.storage || null;
            dlObj.targetPath = movie.path || null;
            dlObj.arrLink = DownloadAssembler.getRadarrLink(movie);
            dlObj.arrQueueId = radarrMatch.id;
            dlObj.arrType = 'radarr';
            dlObj.arrInstanceUrl = radarrMatch._instanceUrl || null;
            dlObj.arrInstanceKey = radarrMatch._instanceKey || null;
            dlObj.arrContentId = radarrMatch.movieId || null;
            dlObj.arrContentType = 'movie';
          }
          dlObj.canBlocklist = DownloadAssembler.canBlocklist(dlObj, isAdmin);
          matched.push(dlObj);
        }
      }
    }
  }
  return matched;
}

/**
 * Matches SABnzbd history slots to Sonarr/Radarr activity using title matching.
 * @param {Array} slots - SABnzbd history slots
 * @param {Object} context - Matching context with records, maps, and user info
 * @returns {Array} Array of matched download objects
 */
function matchSabHistory(slots, context) {
  const {
    sonarrHistoryRecords,
    radarrHistoryRecords,
    seriesMap,
    moviesMap,
    sonarrTagMap,
    radarrTagMap,
    username,
    isAdmin,
    showAll,
    embyUserMap
  } = context;

  const matched = [];
  for (const slot of slots) {
    const nzbName = slot.name || slot.nzb_name || slot.nzbname;
    if (!nzbName) continue;
    const nzbNameLower = nzbName.toLowerCase();

    const sonarrMatch = sonarrHistoryRecords.find(r => {
      const rTitle = (r.sourceTitle || r.title || '').toLowerCase();
      return rTitle && (rTitle.includes(nzbNameLower) || nzbNameLower.includes(rTitle));
    });
    if (sonarrMatch && sonarrMatch.seriesId) {
      const series = seriesMap.get(sonarrMatch.seriesId) || sonarrMatch.series;
      if (series) {
        const allTags = TagMatcher.extractAllTags(series.tags, sonarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(series.tags, sonarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          const dlObj = {
            type: 'series',
            title: nzbName,
            coverArt: DownloadAssembler.getCoverArt(series),
            status: slot.status,
            progress: 100, // History items are completed
            mb: slot.mb,
            size: Math.round((slot.mb || 0) * 1024 * 1024),
            completedAt: slot.completed_time,
            seriesName: series.title,
            episodes: DownloadAssembler.gatherEpisodes(nzbNameLower, sonarrHistoryRecords),
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined,
            client: 'sabnzbd',
            instanceId: slot.instanceId || 'sabnzbd-default',
            instanceName: slot.instanceName || 'SABnzbd'
          };
          if (isAdmin) {
            dlObj.downloadPath = slot.storage || null;
            dlObj.targetPath = series.path || null;
            dlObj.arrLink = DownloadAssembler.getSonarrLink(series);
          }
          matched.push(dlObj);
        }
      }
    }

    const radarrMatch = radarrHistoryRecords.find(r => {
      const rTitle = (r.sourceTitle || r.title || '').toLowerCase();
      return rTitle && (rTitle.includes(nzbNameLower) || nzbNameLower.includes(rTitle));
    });
    if (radarrMatch && radarrMatch.movieId) {
      const movie = moviesMap.get(radarrMatch.movieId) || radarrMatch.movie;
      if (movie) {
        const allTags = TagMatcher.extractAllTags(movie.tags, radarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(movie.tags, radarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          const dlObj = {
            type: 'movie',
            title: nzbName,
            coverArt: DownloadAssembler.getCoverArt(movie),
            status: slot.status,
            progress: 100, // History items are completed
            mb: slot.mb,
            size: Math.round((slot.mb || 0) * 1024 * 1024),
            completedAt: slot.completed_time,
            movieName: movie.title,
            movieInfo: radarrMatch,
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined,
            client: 'sabnzbd',
            instanceId: slot.instanceId || 'sabnzbd-default',
            instanceName: slot.instanceName || 'SABnzbd'
          };
          if (isAdmin) {
            dlObj.downloadPath = slot.storage || null;
            dlObj.targetPath = movie.path || null;
            dlObj.arrLink = DownloadAssembler.getRadarrLink(movie);
          }
          matched.push(dlObj);
        }
      }
    }
  }
  return matched;
}

/**
 * Matches qBittorrent torrents to Sonarr/Radarr activity using title matching.
 * @param {Array} torrents - qBittorrent torrent list
 * @param {Object} context - Matching context with records, maps, and user info
 * @returns {Array} Array of matched download objects
 */
function matchTorrents(torrents, context) {
  const {
    sonarrQueueRecords,
    sonarrHistoryRecords,
    radarrQueueRecords,
    radarrHistoryRecords,
    seriesMap,
    moviesMap,
    sonarrTagMap,
    radarrTagMap,
    username,
    isAdmin,
    showAll,
    embyUserMap
  } = context;

  const matched = [];
  for (const torrent of torrents) {
    const torrentName = torrent.name || '';
    if (!torrentName) continue;
    const torrentNameLower = torrentName.toLowerCase();

    let matchedAny = false;

    const sonarrMatch = sonarrQueueRecords.find(r => {
      const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
      return rTitle && (rTitle.includes(torrentNameLower) || torrentNameLower.includes(rTitle));
    });
    if (sonarrMatch && sonarrMatch.seriesId) {
      const series = seriesMap.get(sonarrMatch.seriesId) || sonarrMatch.series;
      if (series) {
        const allTags = TagMatcher.extractAllTags(series.tags, sonarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(series.tags, sonarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          const download = mapTorrentToDownload(torrent);
          download.id = download.hash || torrent.hash;
          download.progress = parseFloat(download.progress) || torrent.progress || 0;
          download.speed = download.rawSpeed || torrent.dlspeed || 0;
          Object.assign(download, {
            type: 'series',
            coverArt: DownloadAssembler.getCoverArt(series),
            seriesName: series.title,
            episodes: DownloadAssembler.gatherEpisodes(torrentNameLower, sonarrQueueRecords),
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined
          });
          const issues = DownloadAssembler.getImportIssues(sonarrMatch);
          if (issues) download.importIssues = issues;
          if (isAdmin) {
            download.downloadPath = download.savePath || null;
            download.targetPath = series.path || null;
            download.arrLink = DownloadAssembler.getSonarrLink(series);
            download.arrQueueId = sonarrMatch.id;
            download.arrType = 'sonarr';
            download.arrInstanceUrl = sonarrMatch._instanceUrl || null;
            download.arrInstanceKey = sonarrMatch._instanceKey || null;
            download.arrContentId = sonarrMatch.episodeId || null;
            download.arrContentType = 'episode';
          }
          download.canBlocklist = DownloadAssembler.canBlocklist(download, isAdmin);
          matched.push(download);
          matchedAny = true;
          continue;
        }
      }
    }

    const radarrMatch = radarrQueueRecords.find(r => {
      const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
      return rTitle && (rTitle.includes(torrentNameLower) || torrentNameLower.includes(rTitle));
    });
    if (radarrMatch && radarrMatch.movieId) {
      const movie = moviesMap.get(radarrMatch.movieId) || radarrMatch.movie;
      if (movie) {
        const allTags = TagMatcher.extractAllTags(movie.tags, radarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(movie.tags, radarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          const download = mapTorrentToDownload(torrent);
          download.id = download.hash || torrent.hash;
          download.progress = parseFloat(download.progress) || torrent.progress || 0;
          download.speed = download.rawSpeed || torrent.dlspeed || 0;
          Object.assign(download, {
            type: 'movie',
            coverArt: DownloadAssembler.getCoverArt(movie),
            movieName: movie.title,
            movieInfo: radarrMatch,
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined
          });
          const issues = DownloadAssembler.getImportIssues(radarrMatch);
          if (issues) download.importIssues = issues;
          if (isAdmin) {
            download.downloadPath = download.savePath || null;
            download.targetPath = movie.path || null;
            download.arrLink = DownloadAssembler.getRadarrLink(movie);
            download.arrQueueId = radarrMatch.id;
            download.arrType = 'radarr';
            download.arrInstanceUrl = radarrMatch._instanceUrl || null;
            download.arrInstanceKey = radarrMatch._instanceKey || null;
            download.arrContentId = radarrMatch.movieId || null;
            download.arrContentType = 'movie';
          }
          download.canBlocklist = DownloadAssembler.canBlocklist(download, isAdmin);
          matched.push(download);
          matchedAny = true;
          continue;
        }
      }
    }

    const sonarrHistoryMatch = sonarrHistoryRecords.find(r => {
      const rTitle = (r.sourceTitle || r.title || '').toLowerCase();
      return rTitle && (rTitle.includes(torrentNameLower) || torrentNameLower.includes(rTitle));
    });
    if (sonarrHistoryMatch && sonarrHistoryMatch.seriesId) {
      const series = seriesMap.get(sonarrHistoryMatch.seriesId) || sonarrHistoryMatch.series;
      if (series) {
        const allTags = TagMatcher.extractAllTags(series.tags, sonarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(series.tags, sonarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          const download = mapTorrentToDownload(torrent);
          Object.assign(download, {
            type: 'series',
            coverArt: DownloadAssembler.getCoverArt(series),
            seriesName: series.title,
            episodes: DownloadAssembler.gatherEpisodes(torrentNameLower, sonarrHistoryRecords),
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined
          });
          if (isAdmin) {
            download.downloadPath = download.savePath || null;
            download.targetPath = series.path || null;
            download.arrLink = DownloadAssembler.getSonarrLink(series);
          }
          matched.push(download);
          matchedAny = true;
          continue;
        }
      }
    }

    const radarrHistoryMatch = radarrHistoryRecords.find(r => {
      const rTitle = (r.sourceTitle || r.title || '').toLowerCase();
      return rTitle && (rTitle.includes(torrentNameLower) || torrentNameLower.includes(rTitle));
    });
    if (radarrHistoryMatch && radarrHistoryMatch.movieId) {
      const movie = moviesMap.get(radarrHistoryMatch.movieId) || radarrHistoryMatch.movie;
      if (movie) {
        const allTags = TagMatcher.extractAllTags(movie.tags, radarrTagMap);
        const matchedUserTag = TagMatcher.extractUserTag(movie.tags, radarrTagMap, username);
        if (showAll ? allTags.length > 0 : !!matchedUserTag) {
          const download = mapTorrentToDownload(torrent);
          download.id = download.hash || torrent.hash;
          download.progress = parseFloat(download.progress) || torrent.progress || 0;
          download.speed = download.rawSpeed || torrent.dlspeed || 0;
          Object.assign(download, {
            type: 'movie',
            coverArt: DownloadAssembler.getCoverArt(movie),
            movieName: movie.title,
            movieInfo: radarrHistoryMatch,
            allTags,
            matchedUserTag: matchedUserTag || null,
            tagBadges: showAll ? TagMatcher.buildTagBadges(allTags, embyUserMap) : undefined
          });
          if (isAdmin) {
            download.downloadPath = download.savePath || null;
            download.targetPath = movie.path || null;
            download.arrLink = DownloadAssembler.getRadarrLink(movie);
          }
          matched.push(download);
          matchedAny = true;
        }
      }
    }

  }
  return matched;
}

module.exports = {
  buildSeriesMapFromRecords,
  buildMoviesMapFromRecords,
  getSlotStatusAndSpeed,
  matchSabSlots,
  matchSabHistory,
  matchTorrents
};