const rs = require('rswebui');

async function refreshIds() {
  let sslIds = [];
  await rs.rsJsonApiRequest('/rsPeers/getFriendList', {}, (data) => (sslIds = data.sslIds));
  return sslIds;
}

async function loadSslDetails() {
  const sslDetails = [];
  const sslIds = await refreshIds();
  await Promise.all(
    sslIds.map((sslId) =>
      rs.rsJsonApiRequest('/rsPeers/getPeerDetails', { sslId }, (data) => sslDetails.push(data.det))
    )
  );
  return sslDetails;
}

const Data = {
  gpgDetails: {},
};

//  A remembered friend is a placeholder shown while the core catches up with an
//  addSslOnlyFriend / loadCertificateFromString that has just returned. That is
//  a matter of seconds; anything older means the add did not stick, or the peer
//  has since been removed, and the placeholder has to go rather than be
//  re-injected into the friend list on every refresh, browser restarts included.
const PENDING_FRIEND_TTL_MS = 5 * 60 * 1000;

//  Keyed per node: several RetroShare profiles can be reached from the same
//  browser, and their friend lists have nothing to do with each other. Read
//  lazily, since the login is not known when this module is first imported.
let pendingFriends = null;
let pendingFriendsKey = null;

function storageKey() {
  const login = rs.loginKey || {};
  return 'rs-webui-pending-friends:' + (login.url || '') + '|' + (login.username || '');
}

function loadPendingFriends() {
  const key = storageKey();
  if (pendingFriends !== null && pendingFriendsKey === key) return pendingFriends;
  pendingFriendsKey = key;
  try {
    pendingFriends = JSON.parse(localStorage.getItem(key) || '{}');
  } catch (_) {
    pendingFriends = {};
  }
  return pendingFriends;
}

function savePendingFriends() {
  try {
    localStorage.setItem(pendingFriendsKey || storageKey(), JSON.stringify(pendingFriends || {}));
  } catch (_) {
    // The in-memory entry still works when private browsing blocks storage.
  }
}

Data.forgetPendingFriend = function (gpgId) {
  const pending = loadPendingFriends();
  const key = String(gpgId || '').toLowerCase();
  if (!key || !pending[key]) return;
  delete pending[key];
  delete Data.gpgDetails[key];
  savePendingFriends();
};

function hasValidatedFingerprint(value) {
  const fingerprint = String(value || '').replace(/\s/g, '');
  return /[1-9a-f]/i.test(fingerprint);
}

Data.rememberPendingFriend = function (peerDetails) {
  const pending = loadPendingFriends();
  const data = peerDetails || {};
  const gpgId = String(data.gpg_id || data.pgpId || '').toLowerCase();
  const sslId = String(data.id || data.sslId || '');
  if (!gpgId || !sslId) return;
  const pendingValidation = !hasValidatedFingerprint(data.fpr || data.fingerprint);

  pending[gpgId] = {
    rememberedAt: Date.now(),
    name: data.name || (pendingValidation
      ? `Profile ID ${gpgId.toUpperCase()} (Not yet validated)`
      : `Profile ID ${gpgId.toUpperCase()}`),
    fingerprint: data.fpr || '',
    isSearched: false,
    isOnline: false,
    pendingValidation,
    locations: [{
      name: data.location || 'Unknown location',
      id: sslId,
      lastSeen: data.lastConnect || 0,
      isOnline: false,
      gpg_id: gpgId,
      customState: '',
      statusValue: 0,
      statusTimestamp: 0,
      avatar: '',
      peerDetails: data,
    }],
    customState: '',
    statusValue: 0,
    statusTimestamp: 0,
    avatar: '',
  };
  Data.gpgDetails[gpgId] = pending[gpgId];
  savePendingFriends();
};

function normalizeStatusValue(value, fallback) {
  if (value && typeof value === 'object') value = value.value ?? value.status ?? value.xint32;
  if (typeof value === 'number') return value;
  if (typeof value === 'string') {
    const numeric = Number(value);
    if (Number.isFinite(numeric)) return numeric;
    const names = { OFFLINE: 0, AWAY: 1, BUSY: 2, ONLINE: 3, INACTIVE: 4 };
    const match = Object.keys(names).find((name) => value.toUpperCase().includes(name));
    if (match) return names[match];
  }
  return fallback;
}

Data.getStatusPresentation = function (statusValue, isOnline = false) {
  const value = normalizeStatusValue(statusValue, isOnline ? 3 : 0);
  return {
    value,
    label: ['Offline', 'Away', 'Busy', 'Online', 'Inactive'][value] || (isOnline ? 'Online' : 'Offline'),
    color: ['#94a3b8', '#eab308', '#ef4444', '#10b981', '#f59e0b'][value] || '#94a3b8',
  };
};

Data.refreshGpgDetails = async function () {
  const details = {};
  const sslDetails = await loadSslDetails();
  await Promise.all(
    sslDetails.map((data) => {
      let isOnline = false;
      return rs
        .rsJsonApiRequest(
          '/rsPeers/isOnline',
          { sslId: data.id },
          (stat) => (isOnline = stat.retval)
        )
        .then(() => {
          let customState = '';
          let statusValue = isOnline ? 3 : 0;
          let statusTimestamp = 0;
          return rs
            .rsJsonApiRequest(
              '/rsChats/getCustomStateString',
              { peer_id: data.id },
              (statusData) => {
                if (statusData && statusData.retval) {
                  customState = statusData.retval;
                }
              }
            )
            .catch(() => {})
            .then(() => rs.rsJsonApiRequest(
              '/rsStatus/getStatus',
              { id: data.id },
              (statusData) => {
                if (statusData && statusData.retval && statusData.statusInfo) {
                  statusValue = normalizeStatusValue(statusData.statusInfo.status, statusValue);
                  statusTimestamp = statusData.statusInfo.time_stamp || 0;
                }
              }
            ).catch(() => {}))
            .then(() => {
              const avatar = '';
              return Promise.resolve()
                .then(() => {
                  const gpgId = (data.gpg_id || '').toLowerCase();
                  const loc = {
                    name: data.location,
                    id: data.id,
                    lastSeen: data.lastConnect,
                    isOnline,
                    gpg_id: gpgId,
                    customState,
                    statusValue,
                    statusTimestamp,
                    avatar,
                    peerDetails: data,
                  };

                  if (details[gpgId] === undefined) {
                    details[gpgId] = {
                      name: data.name,
                      fingerprint: data.fpr || '',
                      isSearched: true,
                      isOnline,
                      locations: [loc],
                      customState,
                      statusValue,
                      statusTimestamp,
                      avatar: avatar || '',
                    };
                  } else {
                    details[gpgId].locations.push(loc);
                    if (!details[gpgId].fingerprint && data.fpr) {
                      details[gpgId].fingerprint = data.fpr;
                    }
                    if (avatar) {
                      details[gpgId].avatar = avatar;
                    }
                    if (!details[gpgId].customState || (isOnline && customState)) {
                      details[gpgId].customState = customState;
                    }
                    if (isOnline || !details[gpgId].isOnline) {
                      details[gpgId].statusValue = statusValue;
                      details[gpgId].statusTimestamp = statusTimestamp;
                    }
                  }
                  details[gpgId].isOnline = details[gpgId].isOnline || isOnline;
                });
            });
        });
    })
  );

  const remembered = loadPendingFriends();
  let rememberedChanged = false;
  Object.entries(remembered).forEach(([gpgId, pending]) => {
    if (details[gpgId]) {
      const nativeFriend = details[gpgId];
      const isValidated = hasValidatedFingerprint(nativeFriend.fingerprint || pending.fingerprint);

      // Unvalidated short-invite peers are returned with an empty profile
      // name and an all-zero fingerprint. Keep the name parsed from the
      // RetroShare ID until the core has validated the PGP profile.
      if (!nativeFriend.name) nativeFriend.name = pending.name;
      if (isValidated) {
        delete remembered[gpgId];
        rememberedChanged = true;
      } else {
        nativeFriend.pendingValidation = true;
      }
    } else if (Date.now() - (pending.rememberedAt || 0) < PENDING_FRIEND_TTL_MS) {
      //  The core does not know this profile yet: keep showing the placeholder,
      //  but only for as long as it can plausibly still be catching up.
      details[gpgId] = pending;
    } else {
      delete remembered[gpgId];
      rememberedChanged = true;
    }
  });
  if (rememberedChanged) savePendingFriends();
  Data.gpgDetails = details;
};
module.exports = Data;