import { Card, CardContent } from '@/components/ui/card';
import { TrendingUp, TrendingDown, Minus } from 'lucide-react';
import { cn } from '@/lib/utils';

/**
 * StatCard - 优化后的统计卡片组件
 * 
 * 优化点：
 * 1. 使用 dg-card 工具类替代硬编码样式
 * 2. 添加 hover 效果和点击交互
 * 3. 图标颜色通过主题变量映射
 * 4. 趋势显示更直观
 * 5. 添加 shimmer loading 效果支持
 */

const colorClasses: Record<string, { bg: string; icon: string; glow: string }> = {
  blue: { bg: 'bg-[var(--dg-blue)]/10', icon: 'text-[var(--dg-blue)]', glow: 'shadow-[var(--dg-blue)]/10' },
  emerald: { bg: 'bg-[var(--dg-green)]/10', icon: 'text-[var(--dg-green)]', glow: 'shadow-[var(--dg-green)]/10' },
  amber: { bg: 'bg-[var(--dg-yellow)]/10', icon: 'text-[var(--dg-yellow)]', glow: 'shadow-[var(--dg-yellow)]/10' },
  rose: { bg: 'bg-[var(--dg-red)]/10', icon: 'text-[var(--dg-red)]', glow: 'shadow-[var(--dg-red)]/10' },
  purple: { bg: 'bg-[var(--dg-purple)]/10', icon: 'text-[var(--dg-purple)]', glow: 'shadow-[var(--dg-purple)]/10' },
  cyan: { bg: 'bg-[var(--dg-cyan)]/10', icon: 'text-[var(--dg-cyan)]', glow: 'shadow-[var(--dg-cyan)]/10' },
  orange: { bg: 'bg-[var(--dg-orange)]/10', icon: 'text-[var(--dg-orange)]', glow: 'shadow-[var(--dg-orange)]/10' },
};

interface StatCardProps {
  title: string;
  value: string | number;
  description?: string;
  icon: React.ElementType;
  trend?: 'up' | 'down' | 'neutral';
  trendValue?: string;
  color: string;
  onClick?: () => void;
  loading?: boolean;
}

export function StatCard({
  title,
  value,
  description,
  icon: Icon,
  trend,
  trendValue,
  color,
  onClick,
  loading = false,
}: StatCardProps) {
  const colors = colorClasses[color] || colorClasses.blue;

  if (loading) {
    return (
      <Card className="dg-card overflow-hidden">
        <CardContent className="p-6 space-y-4">
          <div className="flex items-start justify-between">
            <div className="space-y-3 flex-1">
              <div className="dg-skeleton h-4 w-24 rounded" />
              <div className="dg-skeleton h-8 w-16 rounded" />
            </div>
            <div className="dg-skeleton h-10 w-10 rounded-lg" />
          </div>
          <div className="dg-skeleton h-3 w-32 rounded" />
        </CardContent>
      </Card>
    );
  }

  const TrendIcon = trend === 'up' ? TrendingUp : trend === 'down' ? TrendingDown : Minus;
  const trendColor = trend === 'up'
    ? 'text-[var(--dg-green)]'
    : trend === 'down'
    ? 'text-[var(--dg-red)]'
    : 'text-[var(--dg-text-muted)]';

  return (
    <Card
      className={cn(
        'dg-card dg-card-hover cursor-pointer overflow-hidden',
        onClick && 'cursor-pointer',
      )}
      onClick={onClick}
    >
      <CardContent className="p-6">
        <div className="flex items-start justify-between gap-4">
          <div className="space-y-3 min-w-0 flex-1">
            <p className="text-sm font-medium text-[var(--dg-text-secondary)] truncate">
              {title}
            </p>
            <div className="flex items-baseline gap-2 flex-wrap">
              <h3 className="text-2xl font-bold text-[var(--dg-text-primary)] tracking-tight">
                {value}
              </h3>
              {trend && trendValue && (
                <span className={cn('flex items-center text-xs font-semibold gap-0.5', trendColor)}>
                  <TrendIcon className="h-3.5 w-3.5" />
                  {trendValue}
                </span>
              )}
            </div>
            {description && (
              <p className="text-xs text-[var(--dg-text-muted)]">{description}</p>
            )}
          </div>
          <div
            className={cn(
              'p-3 rounded-xl flex-shrink-0',
              colors.bg,
              colors.icon,
            )}
          >
            <Icon className="h-5 w-5" />
          </div>
        </div>
      </CardContent>
    </Card>
  );
}