/**
 * 数据源域纯工具函数:状态/环境映射、列表筛选与健康分计算。
 * 用途:供 InstancePage 及 features/datasource/components 下各组件共享,无副作用、不依赖 React。
 * 已知限制:健康分为客户端按指标阈值估算的结果,并非后端权威评分。
 */
import type { InstanceItem } from './types';

/** 各数据库类型默认端口 */
export const DB_DEFAULT_PORTS: Record<string, number> = {
  mysql: 3306, postgres: 5432, redis: 6379, mongo: 27017,
};

/** 环境展示名 */
export const envLabel: Record<string, string> = {
  production: '生产', staging: '预发', development: '开发', test: '测试', testing: '测试', uat: 'UAT',
};

/** 环境徽标配色 */
export const envColor: Record<string, string> = {
  production: 'bg-red-500/10 text-red-400 border-red-500/20',
  staging: 'bg-yellow-500/10 text-yellow-400 border-yellow-500/20',
  development: 'bg-green-500/10 text-green-400 border-green-500/20',
  test: 'bg-blue-500/10 text-blue-400 border-blue-500/20',
  testing: 'bg-blue-500/10 text-blue-400 border-blue-500/20',
  uat: 'bg-cyan-500/10 text-cyan-400 border-cyan-500/20',
};

/** 状态展示信息(在线/离线/异常文案) */
const statusLabel: Record<string, { text: string; online: boolean }> = {
  connected: { text: '在线', online: true },
  online: { text: '在线', online: true },
  active: { text: '在线', online: true },
  disconnected: { text: '离线', online: false },
  offline: { text: '离线', online: false },
  error: { text: '异常', online: false },
};

/** 取状态展示信息,未知状态回退「未知」 */
export function getStatusInfo(status: string) {
  return statusLabel[status] || { text: '未知', online: false };
}

/** 是否离线状态 */
export function isOfflineStatus(status: string): boolean {
  return status === 'offline' || status === 'disconnected';
}

/** 状态筛选匹配(online/offline 归并为一类) */
export function matchesStatusFilter(status: string, filterStatus: string): boolean {
  if (!filterStatus) return true;
  const info = getStatusInfo(status);
  if (filterStatus === 'online') return info.online;
  if (filterStatus === 'offline') return isOfflineStatus(status);
  return status === filterStatus;
}

/** 环境筛选匹配(test/testing 归并为一类) */
export function matchesEnvFilter(env: string, filterEnv: string): boolean {
  if (!filterEnv) return true;
  if (filterEnv === 'test') return env === 'test' || env === 'testing';
  return env === filterEnv;
}

/** 计算实例健康分(0-100) */
export function calcHealthScore(inst: InstanceItem): number {
  if (inst.status === 'offline' || inst.status === 'disconnected' || inst.status === 'error') return 0;
  let score = 100;
  const cpu = inst.cpu ?? 0;
  const memory = inst.memory ?? 0;
  const latency = inst.latency ?? 0;
  const disk = inst.disk ?? 0;

  if (cpu > 80) score -= 25;
  else if (cpu > 60) score -= 10;
  if (memory > 85) score -= 20;
  else if (memory > 70) score -= 10;
  if (latency > 10) score -= 20;
  else if (latency > 5) score -= 10;
  if (disk > 80) score -= 15;
  return Math.max(0, score);
}

/** 健康分文字配色 */
export function healthColor(score: number): string {
  if (score >= 90) return 'text-green-400';
  if (score >= 70) return 'text-yellow-400';
  if (score >= 50) return 'text-orange-400';
  return 'text-red-400';
}

/** 健康分背景配色 */
export function healthBg(score: number): string {
  if (score >= 90) return 'bg-green-500/15';
  if (score >= 70) return 'bg-yellow-500/15';
  if (score >= 50) return 'bg-orange-500/15';
  return 'bg-red-500/15';
}

/** 健康分档位文案 */
export function healthLabel(score: number): string {
  if (score >= 90) return '健康';
  if (score >= 70) return '良好';
  if (score >= 50) return '一般';
  return '危险';
}

/** 列表筛选:按类型/状态/环境/关键字过滤,与页面原过滤逻辑一致 */
export function filterInstances(
  instances: InstanceItem[],
  criteria: { activeType: string; filterStatus: string; filterEnv: string; searchQuery: string },
): InstanceItem[] {
  const { activeType, filterStatus, filterEnv, searchQuery } = criteria;
  return instances.filter(i => {
    if (activeType !== 'all' && (activeType === 'postgres' ? !['postgres', 'postgresql', 'pg'].includes(i.db_type) : i.db_type !== activeType)) return false;
    if (!matchesStatusFilter(i.status, filterStatus)) return false;
    if (!matchesEnvFilter(i.env, filterEnv)) return false;
    if (searchQuery && !i.name.toLowerCase().includes(searchQuery.toLowerCase()) && !i.host.includes(searchQuery)) return false;
    return true;
  });
}