import { useEffect } from 'react';
import { Shield, ShieldCheck, ShieldAlert, ShieldX, RefreshCw, Loader2, AlertCircle } from 'lucide-react';
import { useSecurityStore } from '../store/securityStore';

// ZCLAW 16-layer security architecture names (Chinese)
const SECURITY_LAYER_NAMES: Record<string, string> = {
  // Layer 1: Network
  'network.firewall': '网络防火墙',
  'network.tls': 'TLS 加密',
  'network.rate_limit': '速率限制',
  // Layer 2: Authentication
  'auth.device': '设备认证',
  'auth.jwt': 'JWT 令牌',
  'auth.session': '会话管理',
  // Layer 3: Authorization
  'auth.rbac': '角色权限',
  'auth.capabilities': '能力控制',
  // Layer 4: Input Validation
  'input.sanitization': '输入净化',
  'input.schema': '模式验证',
  // Layer 5: Execution
  'exec.sandbox': '沙箱隔离',
  'exec.timeout': '执行超时',
  'exec.resource_limit': '资源限制',
  // Layer 6: Audit & Logging
  'audit.logging': '审计日志',
  'audit.tracing': '请求追踪',
  'audit.alerting': '审计告警',
};

// Default 16 layers for display when API returns minimal data
const DEFAULT_LAYERS = [
  { name: 'network.firewall', enabled: false },
  { name: 'network.tls', enabled: false },
  { name: 'network.rate_limit', enabled: false },
  { name: 'auth.device', enabled: false },
  { name: 'auth.jwt', enabled: false },
  { name: 'auth.session', enabled: false },
  { name: 'auth.rbac', enabled: false },
  { name: 'auth.capabilities', enabled: false },
  { name: 'input.sanitization', enabled: false },
  { name: 'input.schema', enabled: false },
  { name: 'exec.sandbox', enabled: false },
  { name: 'exec.timeout', enabled: false },
  { name: 'exec.resource_limit', enabled: false },
  { name: 'audit.logging', enabled: false },
  { name: 'audit.tracing', enabled: false },
  { name: 'audit.alerting', enabled: false },
];

function getSecurityIcon(level: 'critical' | 'high' | 'medium' | 'low') {
  switch (level) {
    case 'critical':
      return <ShieldCheck className="w-5 h-5 text-green-600" />;
    case 'high':
      return <Shield className="w-5 h-5 text-blue-600" />;
    case 'medium':
      return <ShieldAlert className="w-5 h-5 text-yellow-600" />;
    case 'low':
      return <ShieldX className="w-5 h-5 text-red-600" />;
  }
}

function getSecurityLabel(level: 'critical' | 'high' | 'medium' | 'low') {
  switch (level) {
    case 'critical':
      return { text: '极高', color: 'text-green-600 bg-green-50 border-green-200' };
    case 'high':
      return { text: '高', color: 'text-blue-600 bg-blue-50 border-blue-200' };
    case 'medium':
      return { text: '中', color: 'text-yellow-600 bg-yellow-50 border-yellow-200' };
    case 'low':
      return { text: '低', color: 'text-red-600 bg-red-50 border-red-200' };
  }
}

export function SecurityStatus() {
  const securityStatus = useSecurityStore((s) => s.securityStatus);
  const securityStatusLoading = useSecurityStore((s) => s.securityStatusLoading);
  const securityStatusError = useSecurityStore((s) => s.securityStatusError);
  const loadSecurityStatus = useSecurityStore((s) => s.loadSecurityStatus);

  useEffect(() => {
    loadSecurityStatus();
  }, [loadSecurityStatus]);

  // Loading state
  if (securityStatusLoading && !securityStatus) {
    return (
      <div className="rounded-xl border border-gray-200 bg-white p-4 shadow-sm">
        <div className="flex items-center gap-2 mb-3">
          <Loader2 className="w-4 h-4 text-gray-400 animate-spin" />
          <span className="text-sm font-semibold text-gray-900">安全状态</span>
        </div>
        <p className="text-xs text-gray-400">加载中...</p>
      </div>
    );
  }

  // API error state - show friendly message
  if (securityStatusError && !securityStatus) {
    return (
      <div className="rounded-xl border border-gray-200 bg-white p-4 shadow-sm">
        <div className="flex items-center justify-between mb-3">
          <div className="flex items-center gap-2">
            <AlertCircle className="w-4 h-4 text-yellow-500" />
            <span className="text-sm font-semibold text-gray-900">安全状态</span>
          </div>
          <button
            onClick={() => loadSecurityStatus()}
            className="p-1 text-gray-400 hover:text-orange-500 rounded transition-colors"
            title="重试"
          >
            <RefreshCw className="w-3.5 h-3.5" />
          </button>
        </div>
        <p className="text-xs text-gray-500 mb-2">安全状态检测失败</p>
        <p className="text-xs text-gray-400">
          本地安全检测模块加载失败，请检查安全组件是否正确初始化
        </p>
      </div>
    );
  }

  // Use default layers if no data, or merge with API data
  const displayLayers = securityStatus?.layers?.length
    ? DEFAULT_LAYERS.map((defaultLayer) => {
        const apiLayer = securityStatus.layers.find((l) => l.name === defaultLayer.name);
        return apiLayer || defaultLayer;
      })
    : DEFAULT_LAYERS;

  const enabledCount = displayLayers.filter((l) => l.enabled).length;
  const totalCount = displayLayers.length;
  const securityLevel = securityStatus?.securityLevel ||
    (enabledCount >= 14 ? 'critical' : enabledCount >= 10 ? 'high' : enabledCount >= 6 ? 'medium' : 'low');

  const levelLabel = getSecurityLabel(securityLevel);

  return (
    <div className="rounded-xl border border-gray-200 bg-white p-4 shadow-sm">
      {/* Header */}
      <div className="flex items-center justify-between mb-3">
        <div className="flex items-center gap-2">
          {getSecurityIcon(securityLevel)}
          <span className="text-sm font-semibold text-gray-900">安全状态</span>
          {securityStatusLoading && (
            <Loader2 className="w-3 h-3 text-gray-400 animate-spin" />
          )}
        </div>
        <div className="flex items-center gap-2">
          <span className={`text-xs px-2 py-0.5 rounded-full border ${levelLabel.color}`}>
            {levelLabel.text}
          </span>
          <button
            onClick={() => loadSecurityStatus()}
            className="p-1 text-gray-400 hover:text-orange-500 rounded transition-colors disabled:opacity-50"
            title="刷新安全状态"
            disabled={securityStatusLoading}
          >
            <RefreshCw className="w-3.5 h-3.5" />
          </button>
        </div>
      </div>

      {/* Summary */}
      <div className="mb-3 text-xs text-gray-500">
        已启用 {enabledCount} / {totalCount} 层防护
      </div>

      {/* Progress bar */}
      <div className="mb-4 h-2 bg-gray-100 rounded-full overflow-hidden">
        <div
          className={`h-full transition-all duration-300 ${
            securityLevel === 'critical'
              ? 'bg-green-500'
              : securityLevel === 'high'
              ? 'bg-blue-500'
              : securityLevel === 'medium'
              ? 'bg-yellow-500'
              : 'bg-red-500'
          }`}
          style={{ width: `${(enabledCount / totalCount) * 100}%` }}
        />
      </div>

      {/* Layers Grid */}
      <div className="grid grid-cols-2 gap-1.5">
        {displayLayers.map((layer) => {
          const label = SECURITY_LAYER_NAMES[layer.name] || layer.name;
          return (
            <div
              key={layer.name}
              className={`flex items-center gap-1.5 px-2 py-1.5 rounded-lg text-xs ${
                layer.enabled
                  ? 'bg-green-50 text-green-700'
                  : 'bg-gray-50 text-gray-400'
              }`}
              title={layer.name}
            >
              <div
                className={`w-1.5 h-1.5 rounded-full ${
                  layer.enabled ? 'bg-green-500' : 'bg-gray-300'
                }`}
              />
              <span className="truncate">{label}</span>
            </div>
          );
        })}
      </div>

      {/* Layer Categories */}
      <div className="mt-4 pt-3 border-t border-gray-100">
        <div className="grid grid-cols-3 gap-2 text-xs">
          <CategorySummary
            label="网络"
            layers={displayLayers.filter((l) => l.name.startsWith('network.'))}
          />
          <CategorySummary
            label="认证"
            layers={displayLayers.filter((l) => l.name.startsWith('auth.'))}
          />
          <CategorySummary
            label="执行"
            layers={displayLayers.filter((l) => l.name.startsWith('exec.'))}
          />
          <CategorySummary
            label="输入"
            layers={displayLayers.filter((l) => l.name.startsWith('input.'))}
          />
          <CategorySummary
            label="审计"
            layers={displayLayers.filter((l) => l.name.startsWith('audit.'))}
          />
        </div>
      </div>
    </div>
  );
}

function CategorySummary({ label, layers }: { label: string; layers: { enabled: boolean }[] }) {
  if (layers.length === 0) return null;
  const enabled = layers.filter((l) => l.enabled).length;
  const total = layers.length;
  const allEnabled = enabled === total;

  return (
    <div className="flex flex-col items-center">
      <span className={`font-medium ${allEnabled ? 'text-green-600' : 'text-gray-500'}`}>
        {enabled}/{total}
      </span>
      <span className="text-gray-400">{label}</span>
    </div>
  );
}