// ================================================================
// frontend/src/components/dashboard/InsightsGrid.tsx
// ================================================================
/**
 * Insights Grid - Key metrics at a glance
 *
 * 2x2 grid of important metrics: savings, inventory, waste, deliveries.
 * Mobile-first design with large touch targets.
 */

import React from 'react';
import { Insights } from '../../api/hooks/newDashboard';

interface InsightsGridProps {
  insights: Insights;
  loading?: boolean;
}

const colorConfig = {
  green: {
    bg: 'bg-green-50',
    border: 'border-green-200',
    text: 'text-green-800',
    detail: 'text-green-600',
  },
  amber: {
    bg: 'bg-amber-50',
    border: 'border-amber-200',
    text: 'text-amber-900',
    detail: 'text-amber-600',
  },
  red: {
    bg: 'bg-red-50',
    border: 'border-red-200',
    text: 'text-red-900',
    detail: 'text-red-600',
  },
};

function InsightCard({
  label,
  value,
  detail,
  color,
}: {
  label: string;
  value: string;
  detail: string;
  color: 'green' | 'amber' | 'red';
}) {
  const config = colorConfig[color];

  return (
    <div
      className={`${config.bg} ${config.border} border-2 rounded-xl p-4 md:p-6 transition-all duration-200 hover:shadow-lg cursor-pointer`}
    >
      {/* Label */}
      <div className="text-sm md:text-base font-bold text-gray-700 mb-2">{label}</div>

      {/* Value */}
      <div className={`text-xl md:text-2xl font-bold ${config.text} mb-1`}>{value}</div>

      {/* Detail */}
      <div className={`text-sm ${config.detail} font-medium`}>{detail}</div>
    </div>
  );
}

export function InsightsGrid({ insights, loading }: InsightsGridProps) {
  if (loading) {
    return (
      <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
        {[1, 2, 3, 4].map((i) => (
          <div key={i} className="animate-pulse bg-gray-100 rounded-xl p-6">
            <div className="h-4 bg-gray-200 rounded w-1/2 mb-3"></div>
            <div className="h-8 bg-gray-200 rounded w-3/4 mb-2"></div>
            <div className="h-4 bg-gray-200 rounded w-2/3"></div>
          </div>
        ))}
      </div>
    );
  }

  // Guard against undefined values
  if (!insights || !insights.savings || !insights.inventory || !insights.waste || !insights.deliveries) {
    return null;
  }

  return (
    <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
      <InsightCard
        label={insights.savings?.label || 'Savings'}
        value={insights.savings?.value || '€0'}
        detail={insights.savings?.detail || 'This week'}
        color={insights.savings?.color || 'green'}
      />
      <InsightCard
        label={insights.inventory?.label || 'Inventory'}
        value={insights.inventory?.value || '0%'}
        detail={insights.inventory?.detail || 'Status'}
        color={insights.inventory?.color || 'green'}
      />
      <InsightCard
        label={insights.waste?.label || 'Waste'}
        value={insights.waste?.value || '0%'}
        detail={insights.waste?.detail || 'Reduction'}
        color={insights.waste?.color || 'green'}
      />
      <InsightCard
        label={insights.deliveries?.label || 'Deliveries'}
        value={insights.deliveries?.value || '0%'}
        detail={insights.deliveries?.detail || 'On-time'}
        color={insights.deliveries?.color || 'green'}
      />
    </div>
  );
}