'use strict';

const database = require('../config/database');
const {
  getResilientSecret,
  saveResilientSecret,
} = require('./resilientSecretStore');

const CONFIG_KEY = 'yyd_notification_center_config';
const SECRET_KEY = 'yyd_notification_center_project_secret';
const DEFAULT_BASE_URL = 'https://sc.jiansun.vip/notification-center';
const DEFAULT_TIMEOUT_MS = 15000;
let cachedConfig = null;
let cachedAt = 0;

function normalizeText(value, maxLength = 4000) {
  return String(value ?? '').trim().slice(0, maxLength);
}

function normalizeTimeout(value) {
  const number = Number(value);
  return Number.isFinite(number)
    ? Math.min(Math.max(Math.trunc(number), 3000), 120000)
    : DEFAULT_TIMEOUT_MS;
}

function safeJsonParse(value, fallback = {}) {
  if (value && typeof value === 'object') return value;
  try { return JSON.parse(value || '{}'); } catch (_error) { return fallback; }
}

function stripSecretFields(value) {
  const raw = value && typeof value === 'object' && !Array.isArray(value) ? { ...value } : {};
  delete raw.projectSecret;
  delete raw.project_secret;
  delete raw.secret;
  return raw;
}

function maskSecret(value) {
  const text = normalizeText(value);
  if (!text) return '';
  if (text.length <= 8) return `${text.slice(0, 2)}******`;
  return `${text.slice(0, 4)}${'*'.repeat(Math.min(10, text.length - 8))}${text.slice(-4)}`;
}

function getEnvironmentConfig() {
  return {
    baseUrl: normalizeText(process.env.YYD_NOTIFICATION_CENTER_URL || DEFAULT_BASE_URL, 1000),
    projectCode: normalizeText(
      process.env.YYD_NOTIFICATION_PROJECT_CODE
        || process.env.YYD_NOTIFICATION_CENTER_PROJECT_CODE,
      120
    ),
    projectSecret: normalizeText(
      process.env.YYD_NOTIFICATION_PROJECT_SECRET
        || process.env.YYD_NOTIFICATION_CENTER_PROJECT_SECRET,
      1000
    ),
    recipientAlias: normalizeText(
      process.env.ALIBABA_1688_IMAGE_SEARCH_EXPIRY_RECIPIENT_ALIAS || '苏适',
      50
    ),
    timeoutMs: normalizeTimeout(process.env.YYD_NOTIFICATION_TIMEOUT_MS),
    source: 'environment',
  };
}

async function upsertNotificationCenterConfig(config) {
  const rows = await database.local.query(
    'SELECT id FROM system_config WHERE config_key = ? LIMIT 1',
    [CONFIG_KEY]
  );
  const value = JSON.stringify(config);
  if (rows[0]) {
    await database.local.query(
      'UPDATE system_config SET config_value = ?, config_type = ? WHERE config_key = ?',
      [value, 'json', CONFIG_KEY]
    );
  } else {
    await database.local.insert('system_config', {
      config_key: CONFIG_KEY,
      config_value: value,
      config_type: 'json',
    });
  }
}

async function getYydNotificationCenterRuntimeConfig({ forceRefresh = false } = {}) {
  if (!forceRefresh && cachedConfig && Date.now() - cachedAt < 30000) return { ...cachedConfig };
  const fallback = getEnvironmentConfig();
  let stored = {};
  let storedReadable = false;
  try {
    const rows = await database.local.query(
      'SELECT config_value AS configValue FROM system_config WHERE config_key = ? LIMIT 1',
      [CONFIG_KEY]
    );
    stored = safeJsonParse(rows[0]?.configValue, {});
    storedReadable = true;
  } catch (error) {
    console.warn('读取统一通知中心配置失败，已回退环境变量:', error.message);
  }

  const legacySecret = normalizeText(stored.projectSecret || stored.project_secret || stored.secret);
  const secret = await getResilientSecret(SECRET_KEY, {
    legacyValues: [legacySecret],
    fallbackValues: [fallback.projectSecret],
  });
  const sanitizedStored = stripSecretFields(stored);
  cachedConfig = {
    baseUrl: normalizeText(sanitizedStored.baseUrl || sanitizedStored.base_url || fallback.baseUrl, 1000).replace(/\/+$/, ''),
    projectCode: normalizeText(sanitizedStored.projectCode || sanitizedStored.project_code || fallback.projectCode, 120),
    projectSecret: secret.value,
    recipientAlias: normalizeText(sanitizedStored.recipientAlias || sanitizedStored.recipient_alias || fallback.recipientAlias, 50),
    timeoutMs: normalizeTimeout(sanitizedStored.timeoutMs || sanitizedStored.timeout_ms || fallback.timeoutMs),
    source: Object.keys(sanitizedStored).length > 0 ? 'database' : fallback.source,
    secretSource: secret.source,
  };

  if (storedReadable && legacySecret && secret.value) {
    try {
      await upsertNotificationCenterConfig({
        baseUrl: cachedConfig.baseUrl,
        projectCode: cachedConfig.projectCode,
        recipientAlias: cachedConfig.recipientAlias,
        timeoutMs: cachedConfig.timeoutMs,
      });
    } catch (error) {
      console.warn('清理通知中心旧密钥字段失败:', error.message);
    }
  }
  cachedAt = Date.now();
  return { ...cachedConfig };
}

function validateNotificationCenterConfig(config) {
  if (!config.baseUrl || !config.projectCode || !config.projectSecret || !config.recipientAlias) {
    throw Object.assign(new Error('通知中心地址、项目代码、项目密钥和提醒人不能为空'), { status: 400 });
  }
  let parsed;
  try { parsed = new URL(config.baseUrl); } catch (_error) {
    throw Object.assign(new Error('通知中心地址格式无效'), { status: 400 });
  }
  if (!['http:', 'https:'].includes(parsed.protocol)) {
    throw Object.assign(new Error('通知中心地址必须使用 HTTP 或 HTTPS'), { status: 400 });
  }
}

async function saveYydNotificationCenterConfig(input = {}) {
  const current = await getYydNotificationCenterRuntimeConfig({ forceRefresh: true });
  const nextSecret = normalizeText(input.projectSecret || input.project_secret || input.secret);
  const config = {
    baseUrl: normalizeText(input.baseUrl || input.base_url || current.baseUrl, 1000).replace(/\/+$/, ''),
    projectCode: normalizeText(input.projectCode || input.project_code || current.projectCode, 120),
    projectSecret: nextSecret || current.projectSecret,
    recipientAlias: normalizeText(input.recipientAlias || input.recipient_alias || current.recipientAlias, 50),
    timeoutMs: normalizeTimeout(input.timeoutMs || input.timeout_ms || current.timeoutMs),
  };
  validateNotificationCenterConfig(config);
  if (nextSecret) await saveResilientSecret(SECRET_KEY, nextSecret);
  await upsertNotificationCenterConfig({
    baseUrl: config.baseUrl,
    projectCode: config.projectCode,
    recipientAlias: config.recipientAlias,
    timeoutMs: config.timeoutMs,
  });
  cachedConfig = { ...config, source: 'database', secretSource: 'database' };
  cachedAt = Date.now();
  return toAdminConfig(cachedConfig);
}

function toAdminConfig(config = {}) {
  return {
    configured: Boolean(config.baseUrl && config.projectCode && config.projectSecret && config.recipientAlias),
    baseUrl: config.baseUrl || '',
    projectCode: config.projectCode || '',
    projectSecretConfigured: Boolean(config.projectSecret),
    projectSecretPreview: maskSecret(config.projectSecret),
    recipientAlias: config.recipientAlias || '苏适',
    timeoutMs: normalizeTimeout(config.timeoutMs),
    source: config.source || 'environment',
    reminderDays: [2, 1, 0],
  };
}

async function getYydNotificationCenterAdminConfig() {
  return toAdminConfig(await getYydNotificationCenterRuntimeConfig({ forceRefresh: true }));
}

module.exports = {
  CONFIG_KEY,
  DEFAULT_BASE_URL,
  SECRET_KEY,
  getEnvironmentConfig,
  getYydNotificationCenterAdminConfig,
  getYydNotificationCenterRuntimeConfig,
  maskSecret,
  saveYydNotificationCenterConfig,
  stripSecretFields,
  toAdminConfig,
  validateNotificationCenterConfig,
};