/**
 * anthropic-teams.js — Unified schema parser for Anthropic Teams direct providers.
 *
 * Teams providers (team-vigilio, team-ludo, team-molto, team-nadja, team-buio) use the
 * anthropic-ratelimit-unified-* header family. Headers are present on EVERY response
 * (200 and 429). A 429 is expected when the 7d budget is exhausted and contains valid
 * quota data — do not treat it as an error, extract the headers normally.
 *
 * Header reference (from Face's recon, issue trentuna/a-team#91):
 *   anthropic-ratelimit-unified-status            allowed|rejected
 *   anthropic-ratelimit-unified-5h-status         allowed|rejected
 *   anthropic-ratelimit-unified-5h-utilization    0.0–1.0
 *   anthropic-ratelimit-unified-5h-reset          Unix timestamp
 *   anthropic-ratelimit-unified-7d-status         allowed|rejected
 *   anthropic-ratelimit-unified-7d-utilization    0.0–1.0
 *   anthropic-ratelimit-unified-7d-reset          Unix timestamp
 *   anthropic-ratelimit-unified-7d-surpassed-threshold  (present only when maxed)
 *   anthropic-ratelimit-unified-representative-claim  five_hour|seven_day
 *   anthropic-ratelimit-unified-fallback-percentage   0.0–1.0
 *   anthropic-ratelimit-unified-reset             Unix timestamp (binding reset)
 *   anthropic-ratelimit-unified-overage-status    rejected
 *   anthropic-ratelimit-unified-overage-disabled-reason  org_level_disabled
 *   anthropic-organization-id                     UUID
 *   retry-after                                   seconds (only on 429)
 */

import { getSeverity } from '../report.js';

/**
 * Parse unified rate-limit headers from a Teams API response.
 *
 * @param {Object} headers — fetch Response.headers (or compatible mock with .get(name))
 * @param {number} httpStatus — HTTP status code of the response
 * @param {string} providerName — name for logging/context
 * @returns {Object} normalized provider result
 */
export function parseTeamsHeaders(headers, httpStatus, providerName) {
  const h = (name) => headers.get(name);

  // 401 = invalid API key — no quota data available
  if (httpStatus === 401) {
    return {
      type: 'teams-direct',
      status: 'invalid_key',
      utilization_5h: null,
      utilization_7d: null,
      severity: 'unknown',
    };
  }

  const status = h('anthropic-ratelimit-unified-status') || (httpStatus === 429 ? 'rejected' : 'allowed');
  const util5h = parseFloat(h('anthropic-ratelimit-unified-5h-utilization'));
  const util7d = parseFloat(h('anthropic-ratelimit-unified-7d-utilization'));
  const resetTs = parseInt(h('anthropic-ratelimit-unified-reset'), 10);
  const retryAfter = h('retry-after') ? parseInt(h('retry-after'), 10) : null;

  // Compute reset_in_seconds from the binding reset Unix timestamp
  const nowSec = Math.floor(Date.now() / 1000);
  const resetInSeconds = !isNaN(resetTs) ? Math.max(0, resetTs - nowSec) : null;

  const result = {
    type: 'teams-direct',
    status,
    utilization_5h: isNaN(util5h) ? null : util5h,
    utilization_7d: isNaN(util7d) ? null : util7d,
    representative_claim: h('anthropic-ratelimit-unified-representative-claim') || null,
    reset_timestamp: isNaN(resetTs) ? null : resetTs,
    reset_in_seconds: resetInSeconds,
    organization_id: h('anthropic-organization-id') || null,
    // Additional detail headers
    status_5h: h('anthropic-ratelimit-unified-5h-status') || null,
    status_7d: h('anthropic-ratelimit-unified-7d-status') || null,
    overage_status: h('anthropic-ratelimit-unified-overage-status') || null,
    fallback_percentage: h('anthropic-ratelimit-unified-fallback-percentage')
      ? parseFloat(h('anthropic-ratelimit-unified-fallback-percentage'))
      : null,
  };

  // Include retry_after_seconds only when present (429 responses)
  if (retryAfter !== null) {
    result.retry_after_seconds = retryAfter;
  }

  // Include surpassed threshold when present (maxed budget)
  const surpassed = h('anthropic-ratelimit-unified-7d-surpassed-threshold');
  if (surpassed !== null) {
    result.surpassed_threshold_7d = parseFloat(surpassed);
  }

  result.severity = getSeverity(result);
  return result;
}

/**
 * Probe a single Teams provider by making a minimal API call.
 * Extracts headers regardless of whether the response is 200 or 429.
 *
 * @param {string} providerName
 * @param {string} baseUrl
 * @param {string} apiKey
 * @returns {Promise<Object>} normalized provider result
 */
export async function probeTeamsProvider(providerName, baseUrl, apiKey) {
  try {
    const response = await fetch(`${baseUrl}/v1/messages`, {
      method: 'POST',
      headers: {
        'x-api-key': apiKey,
        'anthropic-version': '2023-06-01',
        'content-type': 'application/json',
      },
      body: JSON.stringify({
        model: 'claude-haiku-4-5-20251001',
        max_tokens: 1,
        messages: [{ role: 'user', content: 'Hi' }],
      }),
    });

    return parseTeamsHeaders(response.headers, response.status, providerName);
  } catch (err) {
    return {
      type: 'teams-direct',
      status: 'error',
      message: err.message,
      utilization_5h: null,
      utilization_7d: null,
      severity: 'unknown',
    };
  }
}