// integrations/webex/reportsClient.js
// Webex Control Hub Reports API (Pro Pack) — Calling Media Quality.

import axios from 'axios';
import AdmZip from 'adm-zip';
import webex from './WebexClient.js';
import { logger } from '../../utils/logger.js';
import {
  filterMediaQualityRows,
  parseMediaQualityCsv,
  reportDateRangeFromWindow,
} from './reportsCsv.js';

export { filterMediaQualityRows, parseMediaQualityCsv, reportDateRangeFromWindow } from './reportsCsv.js';

const LOG_SCOPE = 'webex:reports';
const TEMPLATE_CACHE_TTL_MS = 24 * 60 * 60 * 1000;

let _templateCache = null;
let _templateCacheAt = 0;

function envInt(name, fallback) {
  const v = Number(process.env[name]);
  return Number.isFinite(v) ? v : fallback;
}

function pollIntervalMs() {
  return envInt('VOICEREPORT_REPORT_POLL_MS', 5000);
}

function pollMaxMs() {
  return envInt('VOICEREPORT_REPORT_POLL_MAX_MS', 180_000);
}

export function _clearReportTemplateCacheForTests() {
  _templateCache = null;
  _templateCacheAt = 0;
}

export async function listReportTemplates() {
  const now = Date.now();
  if (_templateCache && now - _templateCacheAt < TEMPLATE_CACHE_TTL_MS) {
    return _templateCache;
  }
  const data = await webex.request('GET', 'reports/templates');
  const items = data?.items || data?.reportTemplates || [];
  _templateCache = items;
  _templateCacheAt = now;
  return items;
}

/**
 * Resolve template id by env override or fuzzy name match.
 */
export async function resolveMediaQualityTemplateId() {
  const override = process.env.WEBEX_REPORT_TEMPLATE_MEDIA_QUALITY;
  if (override && String(override).trim()) {
    return Number(override);
  }
  const templates = await listReportTemplates();
  const hit = templates.find((t) => {
    const name = String(t.name || t.title || '').toLowerCase();
    return name.includes('media quality') || name.includes('calling media');
  });
  return hit ? Number(hit.id ?? hit.templateId) : null;
}

export async function createReport(templateId, { startDate, endDate, siteList } = {}) {
  if (!templateId || !Number.isFinite(templateId)) {
    return { ok: false, reason: 'no Media Quality report template id (set WEBEX_REPORT_TEMPLATE_MEDIA_QUALITY)' };
  }
  const body = {
    templateId: Number(templateId),
  };
  if (startDate) body.startDate = startDate;
  if (endDate) body.endDate = endDate;
  if (siteList) body.siteList = siteList;

  try {
    const data = await webex.request('POST', 'reports', body);
    return { ok: true, report: data };
  } catch (err) {
    const msg = err.response?.data?.message || err.message;
    logger(LOG_SCOPE, `createReport failed: ${msg}`, 'warn');
    return { ok: false, reason: msg };
  }
}

export async function getReport(reportId) {
  return webex.request('GET', `reports/${reportId}`);
}

export async function pollReportUntilDone(reportId) {
  const deadline = Date.now() + pollMaxMs();
  while (Date.now() < deadline) {
    const report = await getReport(reportId);
    const status = String(report?.status || '').toLowerCase();
    if (status === 'done' || status === 'complete' || status === 'completed') {
      return { ok: true, report };
    }
    if (status === 'failed' || status === 'error') {
      return { ok: false, reason: report?.statusMessage || 'report generation failed', report };
    }
    await new Promise((r) => setTimeout(r, pollIntervalMs()));
  }
  return { ok: false, reason: 'report poll timed out' };
}

/**
 * Download report payload (CSV text or first CSV inside ZIP).
 */
export async function downloadReportText(downloadURL) {
  if (!downloadURL) return { ok: false, reason: 'no downloadURL' };
  const token = await webex.auth.getAccessToken();
  const resp = await axios.get(downloadURL, {
    headers: { Authorization: `Bearer ${token}` },
    responseType: 'arraybuffer',
    timeout: 60_000,
    maxContentLength: 50 * 1024 * 1024,
  });
  const buf = Buffer.from(resp.data);
  if (buf[0] === 0x50 && buf[1] === 0x4b) {
    return extractCsvFromZip(buf);
  }
  return { ok: true, text: buf.toString('utf8') };
}

function extractCsvFromZip(buf) {
  try {
    const zip = new AdmZip(buf);
    const entry = zip.getEntries().find((e) => /\.csv$/i.test(e.entryName));
    if (!entry) return { ok: false, reason: 'no CSV inside report ZIP' };
    return { ok: true, text: entry.getData().toString('utf8') };
  } catch (err) {
    return { ok: false, reason: `ZIP extract failed: ${err.message}` };
  }
}

export async function fetchMediaQualityReport({ window, locationName }) {
  const templateId = await resolveMediaQualityTemplateId();
  if (!templateId) {
    return { available: false, reason: 'Media Quality template not found' };
  }

  const { startDate, endDate } = reportDateRangeFromWindow(window);
  const created = await createReport(templateId, { startDate, endDate });
  if (!created.ok) {
    return { available: false, reason: created.reason };
  }

  const reportId = created.report?.id;
  if (!reportId) {
    return { available: false, reason: 'create report returned no id' };
  }

  const polled = await pollReportUntilDone(reportId);
  if (!polled.ok) {
    return { available: false, reason: polled.reason };
  }

  const downloadURL = polled.report?.downloadURL || polled.report?.downloadUrl;
  const dl = await downloadReportText(downloadURL);
  if (!dl.ok) {
    return { available: false, reason: dl.reason };
  }

  const parsed = parseMediaQualityCsv(dl.text);
  const filtered = filterMediaQualityRows(parsed.rows, { locationName, window });

  return {
    available: true,
    reportId,
    rawCount: parsed.rows.length,
    rows: filtered,
    headers: parsed.headers,
  };
}