// 站点拨测可观测分析 — 按协议聚合指标与异常事件 // Logan.Li
import type { SiteResult, SiteTask } from '../helpers';
import { fmtMs, fmtTime, normalizeProbeType } from '../helpers';
import i18n from '@/i18n';

export interface ProbeEvent {
  id: string;
  at: string;
  timeLabel: string;
  severity: 'info' | 'warn' | 'error';
  title: string;
  detail?: string;
}

export interface HttpObsSummary {
  expectedCode: number;
  okCount: number;
  err4xx: number;
  err5xx: number;
  otherErr: number;
  lastCode?: number;
  lastCodeTone: string;
  events: ProbeEvent[];
  chart: Array<{ time: string; code: number; tone: string; ok: boolean }>;
}

export interface SslObsSummary {
  expiry?: string;
  issuer?: string;
  days?: number;
  daysTone: string;
  handshakeMs: number;
  events: ProbeEvent[];
  chart: Array<{ time: string; days: number }>;
}

export interface LatencyObsSummary {
  avg: number;
  min: number;
  max: number;
  p95: number;
  jitter: number;
  spikeCount: number;
  events: ProbeEvent[];
  chart: Array<{ time: string; latency: number; failed: boolean; spike: boolean }>;
}

export interface ConnectivityObsSummary {
  upRate: string;
  failCount: number;
  lastFailAt?: string;
  events: ProbeEvent[];
  chart: Array<{ time: string; up: number; failed: boolean }>;
}

const tooltipOrder = (results: SiteResult[]) => [...results].reverse();

function httpCodeTone(code: number, expected: number): string {
  if (code === expected || (expected === 200 && code >= 200 && code < 300)) return 'dg-text-green';
  if (code >= 500) return 'dg-text-red';
  if (code >= 400) return 'dg-text-yellow';
  return 'dg-text-red';
}

function pushEvent(events: ProbeEvent[], r: SiteResult, title: string, severity: ProbeEvent['severity'], detail?: string) {
  events.push({
    id: `${r.id}-${title}`,
    at: r.checked_at,
    timeLabel: fmtTime(r.checked_at),
    severity,
    title,
    detail,
  });
}

export function analyzeHttpResults(results: SiteResult[], task: SiteTask): HttpObsSummary {
  const expected = task.expected_status_code || 200;
  const chart = tooltipOrder(results).map((r) => {
    const code = r.http_status_code ?? (r.status === 'success' ? expected : 0);
    const ok = r.status === 'success' && (code === expected || (expected === 200 && code >= 200 && code < 300));
    return { time: fmtTime(r.checked_at).slice(-5), code, tone: code > 0 ? httpCodeTone(code, expected) : 'dg-text-red', ok };
  });
  let okCount = 0;
  let err4xx = 0;
  let err5xx = 0;
  let otherErr = 0;
  const events: ProbeEvent[] = [];
  for (const r of results) {
    const code = r.http_status_code ?? 0;
    if (r.status === 'success' && (code === expected || (expected === 200 && code >= 200 && code < 300))) {
      okCount++;
      continue;
    }
    if (code >= 500) {
      err5xx++;
      pushEvent(events, r, `HTTP ${code}`, 'error', r.error_message || i18n.t('monitor.lbl.siteServerError'));
    } else if (code >= 400) {
      err4xx++;
      pushEvent(events, r, `HTTP ${code}`, 'warn', r.error_message || i18n.t('monitor.lbl.siteClientError'));
    } else if (r.status === 'timeout') {
      otherErr++;
      pushEvent(events, r, i18n.t('common.timeoutError'), 'error', r.error_message);
    } else {
      otherErr++;
      pushEvent(events, r, code > 0 ? `HTTP ${code}` : i18n.t('monitor.lbl.siteRequestFailed'), 'error', r.error_message);
    }
  }
  const latest = results[0];
  const lastCode = latest?.http_status_code;
  return {
    expectedCode: expected,
    okCount,
    err4xx,
    err5xx,
    otherErr,
    lastCode,
    lastCodeTone: lastCode ? httpCodeTone(lastCode, expected) : 'dg-text-red',
    events: events.slice(0, 8),
    chart,
  };
}

export function analyzeSslResults(results: SiteResult[], task: SiteTask): SslObsSummary {
  const latest = results.find((r) => r.ssl_days_remaining != null) ?? results[0];
  const days = latest?.ssl_days_remaining ?? task.ssl_days_remaining;
  const expiry = latest?.ssl_cert_expiry?.slice(0, 10) ?? task.ssl_cert_expiry?.slice(0, 10);
  const issuer = latest?.ssl_cert_issuer;
  const events: ProbeEvent[] = [];
  for (const r of results) {
    if (r.status !== 'success') {
      pushEvent(events, r, i18n.t('monitor.lbl.siteRequestTimeout'), 'error', r.error_message);
    } else if (r.ssl_days_remaining != null && r.ssl_days_remaining < 30) {
      pushEvent(events, r, i18n.t('monitor.siteMonitor.certRemaining', { days: r.ssl_days_remaining }), r.ssl_days_remaining <= 7 ? 'error' : 'warn', expiry);
    }
  }
  const chart = tooltipOrder(results)
    .filter((r) => r.ssl_days_remaining != null)
    .map((r) => ({ time: fmtTime(r.checked_at).slice(-5), days: r.ssl_days_remaining as number }));
  const tone = days == null ? 'text-[var(--dg-text-muted)]' : days <= 7 ? 'dg-text-red' : days <= 30 ? 'dg-text-yellow' : 'dg-text-green';
  const handshakeMs = results.length
    ? results.reduce((s, r) => s + (r.response_time || r.total_time || 0), 0) / results.length
    : 0;
  return { expiry, issuer, days, daysTone: tone, handshakeMs, events: events.slice(0, 8), chart };
}

function analyzeLatencyResults(results: SiteResult[], label: string): LatencyObsSummary {
  const latencies = results.map((r) => r.response_time ?? r.total_time ?? 0).filter((v) => v > 0);
  const sorted = [...latencies].sort((a, b) => a - b);
  const avg = latencies.length ? latencies.reduce((a, b) => a + b, 0) / latencies.length : 0;
  const min = sorted[0] ?? 0;
  const max = sorted[sorted.length - 1] ?? 0;
  const p95 = sorted.length ? sorted[Math.floor(sorted.length * 0.95)] ?? max : 0;
  const jitter = max - min;
  const spikeThreshold = Math.max(avg * 1.8, avg + 50);
  const events: ProbeEvent[] = [];
  let spikeCount = 0;
  const chart = tooltipOrder(results).map((r) => {
    const latency = r.response_time ?? r.total_time ?? 0;
    const failed = r.status !== 'success';
    const spike = !failed && latency > spikeThreshold;
    if (failed) pushEvent(events, r, i18n.t('monitor.siteMonitor.checkFailed', { label }), 'error', r.error_message || r.remote_ip);
    else if (spike) {
      spikeCount++;
      pushEvent(events, r, i18n.t('monitor.siteMonitor.latencyFluctuation', { label }), 'warn', fmtMs(latency));
    }
    return { time: fmtTime(r.checked_at).slice(-5), latency, failed, spike };
  });
  return { avg, min, max, p95, jitter, spikeCount, events: events.slice(0, 8), chart };
}

export function analyzePingResults(results: SiteResult[]): LatencyObsSummary {
  return analyzeLatencyResults(results, 'PING');
}

export function analyzeDnsResults(results: SiteResult[]): LatencyObsSummary {
  return analyzeLatencyResults(results, i18n.t('cloud.domainResolve'));
}

export function analyzeTcpResults(results: SiteResult[]): ConnectivityObsSummary {
  const successCount = results.filter((r) => r.status === 'success').length;
  const failCount = results.length - successCount;
  const upRate = results.length > 0 ? `${(successCount / results.length * 100).toFixed(1)}%` : '--';
  const events: ProbeEvent[] = [];
  let lastFailAt: string | undefined;
  const chart = tooltipOrder(results).map((r) => {
    const failed = r.status !== 'success';
    if (failed) {
      lastFailAt = r.checked_at;
      pushEvent(events, r, i18n.t('monitor.lbl.siteConnFailed'), 'error', r.error_message || i18n.t('aiops.llmTestFailed'));
    }
    return { time: fmtTime(r.checked_at).slice(-5), up: failed ? 0 : 100, failed };
  });
  return { upRate, failCount, lastFailAt: lastFailAt ? fmtTime(lastFailAt) : undefined, events: events.slice(0, 8), chart };
}

export function getProbeObsSummary(task: SiteTask, results: SiteResult[]) {
  const type = normalizeProbeType(task.type);
  switch (type) {
    case 'HTTP': return { type, http: analyzeHttpResults(results, task) } as const;
    case 'SSL': return { type, ssl: analyzeSslResults(results, task) } as const;
    case 'PING': return { type, latency: analyzePingResults(results) } as const;
    case 'DNS': return { type, latency: analyzeDnsResults(results) } as const;
    case 'TCP': return { type, tcp: analyzeTcpResults(results) } as const;
    default: return { type: 'HTTP' as const, http: analyzeHttpResults(results, task) };
  }
}