import crypto from 'crypto';
import xml2js from 'xml2js';

const BBB_URL = process.env.BBB_URL || 'https://your-bbb-server.com/bigbluebutton/api/';
const BBB_SECRET = process.env.BBB_SECRET || '';

function getChecksum(apiCall, params) {
  const queryString = new URLSearchParams(params).toString();
  const raw = apiCall + queryString + BBB_SECRET;
  return crypto.createHash('sha256').update(raw).digest('hex');
}

function buildUrl(apiCall, params = {}) {
  const checksum = getChecksum(apiCall, params);
  const queryString = new URLSearchParams({ ...params, checksum }).toString();
  return `${BBB_URL}${apiCall}?${queryString}`;
}

async function apiCall(apiCallName, params = {}, xmlBody = null) {
  const url = buildUrl(apiCallName, params);
  // Logging: compact key=value style, filter sensitive params
  function formatUTC(d) {
    const pad = n => String(n).padStart(2, '0');
    const Y = d.getUTCFullYear();
    const M = pad(d.getUTCMonth() + 1);
    const D = pad(d.getUTCDate());
    const h = pad(d.getUTCHours());
    const m = pad(d.getUTCMinutes());
    const s = pad(d.getUTCSeconds());
    return `${Y}-${M}-${D} ${h}:${m}:${s} UTC`;
  }

  const SENSITIVE_KEYS = [/pass/i, /pwd/i, /password/i, /token/i, /jwt/i, /secret/i, /authorization/i, /auth/i, /api[_-]?key/i];
  const isSensitive = key => SENSITIVE_KEYS.some(rx => rx.test(key));

  function sanitizeParams(p) {
    try {
      const out = [];
      for (const k of Object.keys(p || {})) {
        if (k.toLowerCase() === 'checksum') continue; // never log checksum
        if (isSensitive(k)) {
          out.push(`${k}=[FILTERED]`);
        } else {
          let v = p[k];
          if (typeof v === 'string' && v.length > 100) v = v.slice(0, 100) + '...[truncated]';
          out.push(`${k}=${String(v)}`);
        }
      }
      return out.join('&') || '-';
    } catch (e) {
      return '-';
    }
  }

  const start = Date.now();
  try {
    const fetchOptions = xmlBody
      ? { method: 'POST', headers: { 'Content-Type': 'application/xml' }, body: xmlBody }
      : {};
    const response = await fetch(url, fetchOptions);
    const duration = Date.now() - start;
    const xml = await response.text();
    const result = await xml2js.parseStringPromise(xml, {
      explicitArray: false,
      trim: true,
    });

    // Compact log: time=... method=GET path=getMeetings format=xml status=200 duration=12.34 bbb_returncode=SUCCESS params=meetingID=123
    try {
      const tokens = [];
      tokens.push(`time=${formatUTC(new Date())}`);
      tokens.push(`method=${xmlBody ? 'POST' : 'GET'}`);
      tokens.push(`path=${apiCallName}`);
      tokens.push(`format=xml`);
      tokens.push(`status=${response.status}`);
      tokens.push(`duration=${(duration).toFixed(2)}`);
      const bbbCode = result && result.response && result.response.returncode ? result.response.returncode : '-';
      tokens.push(`bbb_returncode=${bbbCode}`);
      const safeParams = sanitizeParams(params);
      tokens.push(`params=${safeParams}`);
      console.info(tokens.join(' '));
    } catch (e) {
      // ignore logging errors
    }

    return result.response;
  } catch (error) {
    const duration = Date.now() - start;
    console.error(`BBB API error (${apiCallName}) status=error duration=${(duration).toFixed(2)} err=${error.message}`);
    throw error;
  }
}

// Generate deterministic passwords from room UID
function getRoomPasswords(uid) {
  const modPw = crypto.createHash('sha256').update(uid + '_mod_' + BBB_SECRET).digest('hex').substring(0, 16);
  const attPw = crypto.createHash('sha256').update(uid + '_att_' + BBB_SECRET).digest('hex').substring(0, 16);
  return { moderatorPW: modPw, attendeePW: attPw };
}

export async function createMeeting(room, logoutURL, loginURL = null, presentationUrl = null) {
  const { moderatorPW, attendeePW } = getRoomPasswords(room.uid);

  // Build welcome message with guest invite link
  let welcome = room.welcome_message || t('defaultWelcome');
  if (logoutURL) {
    const guestLink = `${logoutURL}/join/${room.uid}`;
    welcome += `<br><br>To invite other participants, share this link:<br><a href="${guestLink}">${guestLink}</a>`;
    if (room.access_code) {
      welcome += `<br>Access Code: <b>${room.access_code}</b>`;
    }
  }

  const params = {
    meetingID: room.uid,
    name: room.name,
    attendeePW,
    moderatorPW,
    welcome,
    record: room.record_meeting ? 'true' : 'false',
    autoStartRecording: 'false',
    allowStartStopRecording: 'true',
    muteOnStart: room.mute_on_join ? 'true' : 'false',
    'meta_bbb-origin': 'Redlight',
    'meta_bbb-origin-server-name': 'Redlight',
  };
  if (logoutURL) {
    params.logoutURL = logoutURL;
  }
  if (loginURL) {
    params.loginURL = loginURL;
  }
  if (room.max_participants > 0) {
    params.maxParticipants = room.max_participants.toString();
  }
  if (room.access_code) {
    params.lockSettingsLockOnJoin = 'true';
  }

  // Build optional presentation XML body – escape URL to prevent XML injection
  let xmlBody = null;
  if (presentationUrl) {
    const safeUrl = presentationUrl
      .replace(/&/g, '&amp;')
      .replace(/"/g, '&quot;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;');
    xmlBody = `<modules><module name="presentation"><document url="${safeUrl}" /></module></modules>`;
  }

  return apiCall('create', params, xmlBody);
}

export async function joinMeeting(uid, name, isModerator = false, avatarURL = null) {
  const { moderatorPW, attendeePW } = getRoomPasswords(uid);
  const params = {
    meetingID: uid,
    fullName: name,
    password: isModerator ? moderatorPW : attendeePW,
    redirect: 'true',
  };
  if (avatarURL) {
    params.avatarURL = avatarURL;
  }
  return buildUrl('join', params);
}

export async function endMeeting(uid) {
  const { moderatorPW } = getRoomPasswords(uid);
  return apiCall('end', { meetingID: uid, password: moderatorPW });
}

export async function getMeetingInfo(uid) {
  return apiCall('getMeetingInfo', { meetingID: uid });
}

export async function isMeetingRunning(uid) {
  const result = await apiCall('isMeetingRunning', { meetingID: uid });
  return result.running === 'true';
}

export async function getMeetings() {
  return apiCall('getMeetings', {});
}

export async function getRecordings(meetingID) {
  const params = meetingID ? { meetingID } : {};
  const result = await apiCall('getRecordings', params);
  if (result.returncode !== 'SUCCESS' || !result.recordings) {
    return [];
  }
  const recordings = result.recordings.recording;
  if (!recordings) return [];
  return Array.isArray(recordings) ? recordings : [recordings];
}

export async function getRecordingByRecordId(recordID) {
  const result = await apiCall('getRecordings', { recordID });
  if (result.returncode !== 'SUCCESS' || !result.recordings) {
    return null;
  }
  const recordings = result.recordings.recording;
  if (!recordings) return null;
  const arr = Array.isArray(recordings) ? recordings : [recordings];
  return arr[0] || null;
}

export async function deleteRecording(recordID) {
  return apiCall('deleteRecordings', { recordID });
}

export async function publishRecording(recordID, publish) {
  return apiCall('publishRecordings', { recordID, publish: publish ? 'true' : 'false' });
}

export { getRoomPasswords };