require('dotenv/config');

const { getConfig } = require('../config');
const { resolveEmailDeliveryStatus } = require('../services/email');

function assertCondition(condition, message) {
  if (!condition) {
    throw new Error(message);
  }
}

function formatList(items) {
  return items.filter(Boolean).join(', ');
}

function evaluateWecom(config) {
  if (!config.wecomEnabled) {
    return { state: 'disabled', detail: '企业微信入口未启用', checks: [] };
  }

  const missing = [];
  if (!String(config.wecomCorpId ?? '').trim()) missing.push('WECOM_CORP_ID');
  if (!String(config.wecomAgentId ?? '').trim()) missing.push('WECOM_AGENT_ID');
  if (!String(config.wecomAgentSecret ?? '').trim()) missing.push('WECOM_AGENT_SECRET');
  if (config.wecomOauthEnabled && !String(config.wecomRedirectUri ?? '').trim()) missing.push('WECOM_REDIRECT_URI');
  if (config.wecomEntryEnabled && !String(config.wecomAllowedReturnHosts ?? '').trim()) missing.push('WECOM_ALLOWED_RETURN_HOSTS');

  assertCondition(missing.length === 0, `企业微信配置不完整：${formatList(missing)}`);

  if (!config.wecomEntryEnabled || !config.wecomOauthEnabled) {
    return {
      state: 'degraded',
      detail: `企业微信基础配置已启用，但入口=${config.wecomEntryEnabled ? 'on' : 'off'} oauth=${config.wecomOauthEnabled ? 'on' : 'off'}`,
      checks: ['corpId=present', 'agentId=present'],
    };
  }

  return {
    state: 'ready',
    detail: '企业微信入口与免登配置齐全',
    checks: [
      'corpId=present',
      'agentId=present',
      'redirectUri=present',
      `pcWebLogin=${config.wecomPcWebLoginEnabled ? 'on' : 'off'}`,
    ],
  };
}

function evaluateEmail(config) {
  const status = resolveEmailDeliveryStatus(config);
  if (status.reasons.includes('email_disabled')) {
    return { state: 'disabled', detail: '企业邮箱 SMTP 未启用', checks: [] };
  }

  const reasonLabels = {
    email_from_missing: 'EMAIL_FROM',
    smtp_host_missing: 'SMTP_HOST',
    smtp_port_invalid: 'SMTP_PORT',
    smtp_auth_incomplete: 'SMTP_USER/SMTP_PASS',
  };
  const missing = status.reasons.map((reason) => reasonLabels[reason] ?? reason);

  assertCondition(status.ready, `SMTP 配置不完整：${formatList(missing)}`);

  return {
    state: 'ready',
    detail: 'SMTP 基础配置齐全（仅做配置契约校验，不发真实邮件）',
    checks: ['from=present', 'host=present', 'port=valid', `secure=${config.smtpSecure}`],
  };
}

function evaluateOcr(config) {
  const provider = String(config.ocrProvider ?? 'off').trim();
  if (!provider || provider === 'off') {
    return { state: 'disabled', detail: 'OCR provider 已关闭', checks: [] };
  }

  if (provider === 'mock') {
    return { state: 'mock', detail: 'OCR 使用 mock provider', checks: [`provider=${provider}`] };
  }

  if (provider === 'tencent') {
    const missing = [];
    if (!String(config.tencentSecretId ?? '').trim()) missing.push('TENCENT_SECRET_ID');
    if (!String(config.tencentSecretKey ?? '').trim()) missing.push('TENCENT_SECRET_KEY');
    assertCondition(missing.length === 0, `腾讯 OCR 配置不完整：${formatList(missing)}`);
    return {
      state: 'ready',
      detail: '腾讯 OCR 配置齐全',
      checks: [`provider=${provider}`, 'credentials=present', 'region=present'],
    };
  }

  return {
    state: 'custom',
    detail: `OCR provider=${provider}，请确认对应适配器契约`,
    checks: [`provider=${provider}`],
  };
}

function evaluateBridge(config) {
  if (!config.imNotifierEnabled) {
    return { state: 'disabled', detail: '消息回流桥接未启用', checks: [] };
  }

  const missing = [];
  if (!String(config.appOrigin ?? '').trim()) missing.push('APP_ORIGIN');
  if (!String(config.fieldEncryptionKey ?? '').trim()) missing.push('FIELD_ENCRYPTION_KEY');
  assertCondition(missing.length === 0, `消息桥接配置不完整：${formatList(missing)}`);

  return {
    state: 'ready',
    detail: '消息回流桥接配置齐全',
    checks: ['appOrigin=present'],
  };
}

function printSection(name, section) {
  const tag = section.state === 'ready' || section.state === 'mock' || section.state === 'disabled' || section.state === 'custom'
    ? 'PASS'
    : section.state === 'degraded'
      ? 'WARN'
      : 'INFO';
  console.log(`[${tag}] ${name}: ${section.detail}`);
  for (const line of section.checks ?? []) {
    console.log(`       - ${line}`);
  }
}

function main() {
  const config = getConfig();
  console.log('[R30] 开始 external deps smoke');

  const sections = {
    wecom: evaluateWecom(config),
    email: evaluateEmail(config),
    ocr: evaluateOcr(config),
    bridge: evaluateBridge(config),
  };

  printSection('企业微信', sections.wecom);
  printSection('SMTP 邮件', sections.email);
  printSection('OCR', sections.ocr);
  printSection('消息桥接', sections.bridge);

  console.log('[R30][PASS] external deps smoke 通过');
}

main();