import { createRequesterPairingMaterial, decryptPairingPayloadFromEnvelope, deriveEspPairingPasswordHash } from './js/lib/device-pairing.js';
import { loadPluginSettings, loadSessionMaterial, savePluginSettings, saveSessionMaterial, clearSessionMaterial } from './js/lib/session-store.js';
import { ShineApiClient } from './js/lib/shine-api.js';
import {
  DEFAULT_SHINE_SERVER_LOGIN,
  buildHttpBase,
  normalizeServerLogin,
  resolveShineServerByServerLogin,
} from './js/lib/shine-server-resolver.js';

const state = {
  api: null,
  settings: {
    serverLogin: DEFAULT_SHINE_SERVER_LOGIN,
    serverHttp: buildHttpBase('shineup.me'),
    serverUrl: 'wss://shineup.me/ws',
    login: '',
  },
  requesterMaterial: null,
  pairingId: '',
  expiresAtMs: 0,
  shortCode: '',
  trustedSessionOnline: false,
  pollTimer: 0,
  activeSession: null,
  connectionOnline: false,
  statusText: '',
  statusKind: 'info',
};

function setStatus(message = '', kind = 'info') {
  state.statusText = String(message || '');
  state.statusKind = kind === 'error' ? 'error' : 'info';
}

function stopPoll() {
  if (state.pollTimer) {
    clearTimeout(state.pollTimer);
    state.pollTimer = 0;
  }
}

function clearPairingState() {
  stopPoll();
  state.requesterMaterial = null;
  state.pairingId = '';
  state.expiresAtMs = 0;
  state.shortCode = '';
  state.trustedSessionOnline = false;
}

function ensureApi(serverUrl = state.settings.serverUrl) {
  const normalized = String(serverUrl || '').trim() || 'wss://shineup.me/ws';
  if (!state.api || state.api.serverUrl !== normalized) {
    state.api?.close();
    state.api = new ShineApiClient(normalized);
  }
  return state.api;
}

async function resolveSettingsServer(nextSettings = {}) {
  const serverLogin = normalizeServerLogin(nextSettings?.serverLogin || state.settings.serverLogin || DEFAULT_SHINE_SERVER_LOGIN)
    || DEFAULT_SHINE_SERVER_LOGIN;
  const resolved = await resolveShineServerByServerLogin(serverLogin);
  return {
    serverLogin: resolved.serverLogin,
    serverHttp: resolved.serverHttp,
    serverUrl: resolved.serverUrl,
  };
}

async function loadStateFromStorage() {
  const settings = await loadPluginSettings();
  const storedServerLogin = normalizeServerLogin(settings?.serverLogin || state.settings.serverLogin || DEFAULT_SHINE_SERVER_LOGIN)
    || DEFAULT_SHINE_SERVER_LOGIN;
  state.settings = {
    serverLogin: storedServerLogin,
    serverHttp: String(settings?.serverHttp || state.settings.serverHttp || buildHttpBase('shineup.me')).trim() || buildHttpBase('shineup.me'),
    serverUrl: String(settings?.serverUrl || state.settings.serverUrl || 'wss://shineup.me/ws').trim() || 'wss://shineup.me/ws',
    login: String(settings?.login || '').trim(),
  };
  state.activeSession = await loadSessionMaterial();
}

async function persistSettings(nextSettings = {}) {
  const resolved = await resolveSettingsServer(nextSettings);
  state.settings = {
    ...state.settings,
    ...nextSettings,
    ...resolved,
  };
  await savePluginSettings(state.settings);
  return state.settings;
}

async function resumeActiveSession() {
  const sessionRecord = await loadSessionMaterial();
  state.activeSession = sessionRecord;
  if (!sessionRecord) {
    state.connectionOnline = false;
    setStatus('Wallet-session ещё не подключена.', 'info');
    return { ok: true, connected: false };
  }

  try {
    await persistSettings({
      serverLogin: String(sessionRecord?.serverLogin || state.settings.serverLogin || DEFAULT_SHINE_SERVER_LOGIN).trim(),
      serverHttp: String(sessionRecord?.serverHttp || state.settings.serverHttp || buildHttpBase('shineup.me')).trim(),
      serverUrl: String(sessionRecord?.serverUrl || state.settings.serverUrl || 'wss://shineup.me/ws').trim(),
      login: String(sessionRecord?.login || state.settings.login || '').trim(),
    });
    const resumed = await ensureApi().resumeSession(sessionRecord);
    state.connectionOnline = true;
    setStatus(`Wallet-session активна для @${resumed.login}.`, 'info');
    return { ok: true, connected: true, login: resumed.login, sessionId: resumed.sessionId };
  } catch (error) {
    state.connectionOnline = false;
    setStatus(error.message || 'Не удалось восстановить wallet-session.', 'error');
    return { ok: false, connected: false, error: state.statusText };
  }
}

async function attachApprovedSession(payload) {
  if (String(payload?.type || '') !== 'shine-esp-session-attach') {
    throw new Error('Доверенное устройство вернуло неподдерживаемый payload. Для plugin нужен session-only approve.');
  }

  const login = String(payload?.login || state.settings.login || '').trim();
  const approvedSession = payload?.session || {};
  const sessionRecord = {
    login,
    sessionId: String(approvedSession?.sessionId || '').trim(),
    sessionKey: state.requesterMaterial?.sessionKey || '',
    sessionPrivPkcs8: state.requesterMaterial?.sessionPrivPkcs8 || '',
    sessionType: Number(approvedSession?.sessionType || 50) || 50,
    serverLogin: state.settings.serverLogin,
    serverHttp: state.settings.serverHttp,
    serverUrl: state.settings.serverUrl,
  };
  if (!sessionRecord.login || !sessionRecord.sessionId || !sessionRecord.sessionKey || !sessionRecord.sessionPrivPkcs8) {
    throw new Error('Получен неполный session-only payload');
  }

  await clearSessionMaterial();
  await saveSessionMaterial(sessionRecord);
  state.activeSession = sessionRecord;
  await persistSettings({
    login: sessionRecord.login,
    serverUrl: sessionRecord.serverUrl,
  });
  await resumeActiveSession();
}

async function pollPairingStatus() {
  if (!state.pairingId || !state.requesterMaterial) return;
  try {
    const payload = await ensureApi().getEspPairingStatus(state.pairingId);
    const stateValue = String(payload?.state || '');
    if (stateValue === 'created') {
      state.pollTimer = setTimeout(() => {
        void pollPairingStatus();
      }, 2200);
      return;
    }
    if (stateValue === 'approved') {
      const decoded = await decryptPairingPayloadFromEnvelope(payload?.encryptedPayload, state.requesterMaterial);
      await attachApprovedSession(decoded);
      clearPairingState();
      setStatus('Wallet-session создана и сохранена.', 'info');
      return;
    }
    if (stateValue === 'rejected') {
      clearPairingState();
      setStatus('Заявка отклонена на доверенном устройстве.', 'error');
      return;
    }
    if (stateValue === 'expired' || stateValue === 'canceled') {
      clearPairingState();
      setStatus('Ожидание подключения завершено.', 'error');
      return;
    }
    state.pollTimer = setTimeout(() => {
      void pollPairingStatus();
    }, 2200);
  } catch (error) {
    clearPairingState();
    setStatus(error.message || 'Не удалось проверить pairing-статус.', 'error');
  }
}

async function startPairing({ login, usePassword, password, serverLogin }) {
  const cleanLogin = String(login || '').trim();
  if (!cleanLogin) {
    throw new Error('Введите логин.');
  }

  await persistSettings({
    serverLogin: String(serverLogin || state.settings.serverLogin || DEFAULT_SHINE_SERVER_LOGIN).trim(),
    login: cleanLogin,
  });
  clearPairingState();
  setStatus('Проверяем пользователя и создаём wallet-session заявку...', 'info');

  const api = ensureApi();
  const user = await api.getUser(cleanLogin);
  if (user?.exists !== true) {
    throw new Error('Пользователь не найден.');
  }

  state.requesterMaterial = await createRequesterPairingMaterial();
  const passwordHash = usePassword
    ? await deriveEspPairingPasswordHash(cleanLogin, String(password || ''))
    : '';
  const payload = await api.startEspPairing({
    login: cleanLogin,
    passwordHash,
    requesterSessionKey: state.requesterMaterial.sessionKey,
    payloadType: 1,
  });

  state.pairingId = String(payload?.pairingId || '').trim();
  state.expiresAtMs = Number(payload?.expiresAtMs || 0);
  state.shortCode = String(payload?.shortCode || '0000000');
  state.trustedSessionOnline = !!payload?.trustedSessionOnline;
  if (!state.pairingId) {
    throw new Error('Сервер не вернул pairingId.');
  }

  state.pollTimer = setTimeout(() => {
    void pollPairingStatus();
  }, 1800);

  setStatus('Wallet-session заявка создана. Ожидаем подтверждение на доверенном устройстве.', 'info');
  return {
    pairingId: state.pairingId,
    shortCode: String(payload?.shortCode || '0000000'),
    expiresAtMs: state.expiresAtMs,
    trustedSessionOnline: !!payload?.trustedSessionOnline,
  };
}

async function cancelPairing() {
  if (!state.pairingId || !state.requesterMaterial?.sessionKey) {
    clearPairingState();
    return { ok: true };
  }
  await ensureApi().cancelEspPairing(state.pairingId, state.requesterMaterial.sessionKey);
  clearPairingState();
  setStatus('Ожидание подключения отменено.', 'info');
  return { ok: true };
}

async function disconnectSession() {
  await clearSessionMaterial();
  state.activeSession = null;
  state.connectionOnline = false;
  setStatus('Сохранённая wallet-session удалена из plugin.', 'info');
  return { ok: true };
}

function snapshot() {
  return {
    settings: { ...state.settings },
    pairing: {
      active: !!state.pairingId,
      pairingId: state.pairingId,
      expiresAtMs: state.expiresAtMs,
      shortCode: state.shortCode,
      trustedSessionOnline: state.trustedSessionOnline,
    },
    session: state.activeSession ? { ...state.activeSession } : null,
    connectionOnline: state.connectionOnline,
    status: {
      text: state.statusText,
      kind: state.statusKind,
    },
  };
}

chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
  (async () => {
    const type = String(message?.type || '');
    if (type === 'wallet:getState') {
      await loadStateFromStorage();
      sendResponse({ ok: true, state: snapshot() });
      return;
    }
    if (type === 'wallet:saveSettings') {
      await persistSettings(message?.payload || {});
      sendResponse({ ok: true, state: snapshot() });
      return;
    }
    if (type === 'wallet:startPairing') {
      const result = await startPairing(message?.payload || {});
      sendResponse({ ok: true, result, state: snapshot() });
      return;
    }
    if (type === 'wallet:cancelPairing') {
      const result = await cancelPairing();
      sendResponse({ ok: true, result, state: snapshot() });
      return;
    }
    if (type === 'wallet:resumeSession') {
      const result = await resumeActiveSession();
      sendResponse({ ok: true, result, state: snapshot() });
      return;
    }
    if (type === 'wallet:disconnectSession') {
      const result = await disconnectSession();
      sendResponse({ ok: true, result, state: snapshot() });
      return;
    }
    sendResponse({ ok: false, error: 'UNKNOWN_MESSAGE' });
  })().catch((error) => {
    setStatus(error?.message || 'Unknown error', 'error');
    sendResponse({ ok: false, error: error?.message || 'Unknown error', state: snapshot() });
  });
  return true;
});

void loadStateFromStorage().then(() => resumeActiveSession()).catch((error) => {
  setStatus(error?.message || 'Не удалось инициализировать wallet plugin.', 'error');
});