// services/vcMonitorService.js
// On-demand packet capture (ExtendedLogging + PacketDump) for Cisco RoomOS / Webex video endpoints.
// Uses cloud xAPI (requires spark:xapi_commands scope on the Service App / Integration).
// After capture, logs (containing the pcap) are retrieved from Control Hub diagnostics — not a direct file download.

import webex from '../integrations/webex/WebexClient.js';
import xapi from '../integrations/webex/XapiClient.js';
import { logger } from '../utils/logger.js';

const VALID_PACKETDUMP = ['Full', 'Limited', 'FullRotate', 'None'];

export async function startPacketCapture(bot, serialNumber, packetDump = 'Full') {
  if (!serialNumber) throw new Error('Serial number is required');

  const dumpType = normalizePacketDump(packetDump);
  logger('vc-monitor', `Starting packet capture for serial ${serialNumber} (PacketDump=${dumpType})`);

  try {
    await bot.say('markdown', `🚀 Starting extended logging + packet capture on **${serialNumber}** (PacketDump: **${dumpType}**)...`);

    // 1. Find device (same pattern as vcProvision)
    const devicesResponse = await webex.request('GET', 'devices', null, { serial: serialNumber });

    if (!devicesResponse.items || devicesResponse.items.length === 0) {
      throw new Error(`No device found with serial ${serialNumber}`);
    }
    if (devicesResponse.items.length > 1) {
      throw new Error(`Multiple devices found with serial ${serialNumber}`);
    }

    const device = devicesResponse.items[0];
    const display = device.displayName || device.serial || serialNumber;
    logger('vc-monitor', `Found device ${display} (${device.id})`);

    await bot.say('markdown', `✅ Device found: **${display}**`);

    // 2. Issue the xCommand
    await bot.say('markdown', `📡 Issuing \`Logging ExtendedLogging Start PacketDump: ${dumpType}\` ...`);

    const result = await xapi.xCommandWithDevice(
      'Logging.ExtendedLogging.Start',
      device.id,
      { PacketDump: dumpType }
    );

    logger('vc-monitor', `xCommand result: ${JSON.stringify(result)}`);

    const durationHint = dumpType === 'Full' ? '~3 minutes (includes RTP/media)'
                        : dumpType === 'Limited' ? '~10 minutes (non-RTP/signaling)'
                        : dumpType === 'FullRotate' ? 'rolling (keeps recent ~1h worth)'
                        : 'no packet dump';

    await bot.say('markdown',
      `✅ **Capture started successfully**\n\n` +
      `**Device:** ${display}\n` +
      `**PacketDump:** ${dumpType} — ${durationHint}\n\n` +
      `**Next steps (important):**\n` +
      `1. Reproduce the problem **now** while the capture is running.\n` +
      `2. When finished, run:\n` +
      `   \`/vcMonitor ${serialNumber} stop\`\n` +
      `3. Download the logs from **Control Hub**:\n` +
      `   - Devices → find device → **Issues & Diagnostics** → **System Logs**\n` +
      `   - Look for the most recent log bundle (the packet capture .pcap files are included, typically in the \`run/\` folder or a dedicated "Packet Captures" section).\n\n` +
      `The capture will time out automatically, but stopping explicitly is recommended for a clean bundle.`
    );

    return { success: true, deviceId: device.id, dumpType, result };

  } catch (error) {
    const msg = error.response?.data?.message || error.message || 'Unknown error';
    logger('vc-monitor', `startPacketCapture failed for ${serialNumber}: ${msg}`, 'error');

    // Common permission hint
    if (msg.toLowerCase().includes('403') || msg.toLowerCase().includes('unauthorized') || msg.toLowerCase().includes('scope')) {
      await bot.say('markdown', `⚠️ **Permission error** — does your Webex integration have the \`spark:xapi_commands\` scope?`);
    }

    await bot.say('markdown', `❌ **Failed to start capture on ${serialNumber}**\n\n${msg}`);
    throw error;
  }
}

export async function stopPacketCapture(bot, serialNumber) {
  if (!serialNumber) throw new Error('Serial number is required');

  logger('vc-monitor', `Stopping packet capture for serial ${serialNumber}`);

  try {
    await bot.say('markdown', `🛑 Stopping extended logging + packet capture on **${serialNumber}**...`);

    const devicesResponse = await webex.request('GET', 'devices', null, { serial: serialNumber });
    if (!devicesResponse.items || devicesResponse.items.length === 0) {
      throw new Error(`No device found with serial ${serialNumber}`);
    }
    const device = devicesResponse.items[0];
    const display = device.displayName || device.serial || serialNumber;

    const result = await xapi.xCommandWithDevice('Logging.ExtendedLogging.Stop', device.id, {});
    logger('vc-monitor', `Stop result: ${JSON.stringify(result)}`);

    await bot.say('markdown',
      `✅ **Capture stopped** on **${display}**\n\n` +
      `Now retrieve the logs (which include the packet captures):\n` +
      `- Control Hub → Devices → select the device → **Issues & Diagnostics** → **System Logs** (download the latest bundle).\n` +
      `- Or use the device's local web UI (Issues and Diagnostics) if you have direct access.\n\n` +
      `Tip: Full bundles are usually what you want (they contain the PCAPs in the run/ directory).`
    );

    return { success: true, deviceId: device.id, result };

  } catch (error) {
    const msg = error.response?.data?.message || error.message || 'Unknown error';
    logger('vc-monitor', `stopPacketCapture failed for ${serialNumber}: ${msg}`, 'error');
    await bot.say('markdown', `❌ **Failed to stop capture on ${serialNumber}**\n\n${msg}`);
    throw error;
  }
}

export async function getExtendedLoggingStatus(bot, serialNumber) {
  if (!serialNumber) throw new Error('Serial number is required');

  logger('vc-monitor', `Querying ExtendedLogging status for ${serialNumber}`);

  try {
    await bot.say('markdown', `📡 Querying status on **${serialNumber}**...`);

    const devicesResponse = await webex.request('GET', 'devices', null, { serial: serialNumber });
    if (!devicesResponse.items || devicesResponse.items.length === 0) {
      throw new Error(`No device found with serial ${serialNumber}`);
    }
    const device = devicesResponse.items[0];
    const display = device.displayName || device.serial || serialNumber;

    // Query the whole ExtendedLogging subtree
    const status = await xapi.xStatus(device.id, 'Logging.ExtendedLogging');

    logger('vc-monitor', `Status response keys: ${Object.keys(status || {})}`);

    // Try to surface the useful bits (structure can vary slightly by RoomOS version)
    const ext = status?.result?.Logging?.ExtendedLogging || status?.result || {};
    const mode = ext.Mode || ext.mode || '—';
    const packetDump = ext.PacketDump || ext.packetDump || '—';

    let summary = `**ExtendedLogging status for ${display}:**\n`;
    summary += `- Mode: **${mode}**\n`;
    summary += `- PacketDump: **${packetDump}**\n`;

    // If more detail is present (e.g. under PacketDump or files), surface a bit
    if (ext.PacketDump && typeof ext.PacketDump === 'object') {
      summary += `- Details: ${JSON.stringify(ext.PacketDump)}\n`;
    }

    await bot.say('markdown', summary);

    // Also give a compact raw snippet for debugging (don't overwhelm)
    const raw = JSON.stringify(status, null, 2);
    const snippet = raw.length > 1200 ? raw.slice(0, 1200) + '\n... (truncated)' : raw;
    await bot.say('markdown', `**Raw status (for diagnostics):**\n\`\`\`json\n${snippet}\n\`\`\``);

    return { success: true, deviceId: device.id, status, mode, packetDump };

  } catch (error) {
    const msg = error.response?.data?.message || error.message || 'Unknown error';
    logger('vc-monitor', `getExtendedLoggingStatus failed for ${serialNumber}: ${msg}`, 'error');
    await bot.say('markdown', `❌ **Failed to get status for ${serialNumber}**\n\n${msg}`);
    throw error;
  }
}

function normalizePacketDump(input = 'Full') {
  const s = String(input || '').trim();
  const match = VALID_PACKETDUMP.find(v => v.toLowerCase() === s.toLowerCase());
  return match || 'Full';
}

export default {
  startPacketCapture,
  stopPacketCapture,
  getExtendedLoggingStatus
};