// ================================================================
// frontend/src/components/dashboard/OrchestrationSummaryCard.tsx
// ================================================================
/**
 * Orchestration Summary Card - What the system did for you
 *
 * Builds trust by showing transparency into automation decisions.
 * Narrative format makes it feel like a helpful assistant.
 */

import React, { useState } from 'react';
import {
  Bot,
  TrendingUp,
  Package,
  Clock,
  CheckCircle,
  FileText,
  Users,
  Database,
  Brain,
  ChevronDown,
  ChevronUp,
} from 'lucide-react';
import { OrchestrationSummary } from '../../api/hooks/newDashboard';
import { formatDistanceToNow } from 'date-fns';

interface OrchestrationSummaryCardProps {
  summary: OrchestrationSummary;
  loading?: boolean;
}

export function OrchestrationSummaryCard({ summary, loading }: OrchestrationSummaryCardProps) {
  const [expanded, setExpanded] = useState(false);

  if (loading) {
    return (
      <div className="bg-white rounded-xl shadow-md p-6">
        <div className="animate-pulse space-y-4">
          <div className="flex items-center gap-3">
            <div className="w-10 h-10 bg-gray-200 rounded-full"></div>
            <div className="h-6 bg-gray-200 rounded w-1/2"></div>
          </div>
          <div className="space-y-2">
            <div className="h-4 bg-gray-200 rounded"></div>
            <div className="h-4 bg-gray-200 rounded w-5/6"></div>
          </div>
        </div>
      </div>
    );
  }

  // Handle case where no orchestration has run yet
  if (summary.status === 'no_runs') {
    return (
      <div className="bg-blue-50 border-2 border-blue-200 rounded-xl p-6">
        <div className="flex items-start gap-4">
          <Bot className="w-10 h-10 text-blue-600 flex-shrink-0" />
          <div>
            <h3 className="text-lg font-bold text-blue-900 mb-2">
              Ready to Plan Your Bakery Day
            </h3>
            <p className="text-blue-700 mb-4">{summary.message}</p>
            <button className="bg-blue-600 hover:bg-blue-700 text-white px-4 py-2 rounded-lg font-semibold transition-colors duration-200">
              Run Daily Planning
            </button>
          </div>
        </div>
      </div>
    );
  }

  const runTime = summary.runTimestamp
    ? formatDistanceToNow(new Date(summary.runTimestamp), { addSuffix: true })
    : 'recently';

  return (
    <div className="bg-gradient-to-br from-purple-50 to-blue-50 rounded-xl shadow-md p-6 border border-purple-100">
      {/* Header */}
      <div className="flex items-start gap-4 mb-6">
        <div className="bg-purple-100 p-3 rounded-full">
          <Bot className="w-8 h-8 text-purple-600" />
        </div>
        <div className="flex-1">
          <h2 className="text-2xl font-bold text-gray-900 mb-1">
            Last Night I Planned Your Day
          </h2>
          <div className="flex items-center gap-2 text-sm text-gray-600">
            <Clock className="w-4 h-4" />
            <span>Orchestration run #{summary.runNumber} • {runTime}</span>
            {summary.durationSeconds && (
              <span className="text-gray-400">• Took {summary.durationSeconds}s</span>
            )}
          </div>
        </div>
      </div>

      {/* Purchase Orders Created */}
      {summary.purchaseOrdersCreated > 0 && (
        <div className="bg-white rounded-lg p-4 mb-4">
          <div className="flex items-center gap-3 mb-3">
            <CheckCircle className="w-5 h-5 text-green-600" />
            <h3 className="font-bold text-gray-900">
              Created {summary.purchaseOrdersCreated} purchase order
              {summary.purchaseOrdersCreated !== 1 ? 's' : ''}
            </h3>
          </div>

          {summary.purchaseOrdersSummary.length > 0 && (
            <ul className="space-y-2 ml-8">
              {summary.purchaseOrdersSummary.map((po, index) => (
                <li key={index} className="text-sm text-gray-700">
                  <span className="font-medium">{po.supplierName}</span>
                  {' • '}
                  {po.itemCategories.slice(0, 2).join(', ')}
                  {po.itemCategories.length > 2 && ` +${po.itemCategories.length - 2} more`}
                  {' • '}
                  <span className="font-semibold">€{po.totalAmount.toFixed(2)}</span>
                </li>
              ))}
            </ul>
          )}
        </div>
      )}

      {/* Production Batches Created */}
      {summary.productionBatchesCreated > 0 && (
        <div className="bg-white rounded-lg p-4 mb-4">
          <div className="flex items-center gap-3 mb-3">
            <CheckCircle className="w-5 h-5 text-green-600" />
            <h3 className="font-bold text-gray-900">
              Scheduled {summary.productionBatchesCreated} production batch
              {summary.productionBatchesCreated !== 1 ? 'es' : ''}
            </h3>
          </div>

          {summary.productionBatchesSummary.length > 0 && (
            <ul className="space-y-2 ml-8">
              {summary.productionBatchesSummary.slice(0, expanded ? undefined : 3).map((batch, index) => (
                <li key={index} className="text-sm text-gray-700">
                  <span className="font-semibold">{batch.quantity}</span> {batch.productName}
                  {' • '}
                  <span className="text-gray-500">
                    ready by {new Date(batch.readyByTime).toLocaleTimeString('en-US', {
                      hour: 'numeric',
                      minute: '2-digit',
                      hour12: true,
                    })}
                  </span>
                </li>
              ))}
            </ul>
          )}

          {summary.productionBatchesSummary.length > 3 && (
            <button
              onClick={() => setExpanded(!expanded)}
              className="ml-8 mt-2 flex items-center gap-1 text-sm text-purple-600 hover:text-purple-800 font-medium"
            >
              {expanded ? (
                <>
                  <ChevronUp className="w-4 h-4" />
                  Show less
                </>
              ) : (
                <>
                  <ChevronDown className="w-4 h-4" />
                  Show {summary.productionBatchesSummary.length - 3} more
                </>
              )}
            </button>
          )}
        </div>
      )}

      {/* No actions created */}
      {summary.purchaseOrdersCreated === 0 && summary.productionBatchesCreated === 0 && (
        <div className="bg-white rounded-lg p-4 mb-4">
          <div className="flex items-center gap-3">
            <CheckCircle className="w-5 h-5 text-gray-400" />
            <p className="text-gray-600">No new actions needed - everything is on track!</p>
          </div>
        </div>
      )}

      {/* Reasoning Inputs (How decisions were made) */}
      <div className="bg-white/60 rounded-lg p-4">
        <div className="flex items-center gap-2 mb-3">
          <Brain className="w-5 h-5 text-purple-600" />
          <h3 className="font-bold text-gray-900">Based on:</h3>
        </div>

        <div className="grid grid-cols-2 gap-3 ml-7">
          {summary.reasoningInputs.customerOrders > 0 && (
            <div className="flex items-center gap-2 text-sm">
              <Users className="w-4 h-4 text-gray-600" />
              <span className="text-gray-700">
                {summary.reasoningInputs.customerOrders} customer order
                {summary.reasoningInputs.customerOrders !== 1 ? 's' : ''}
              </span>
            </div>
          )}

          {summary.reasoningInputs.historicalDemand && (
            <div className="flex items-center gap-2 text-sm">
              <TrendingUp className="w-4 h-4 text-gray-600" />
              <span className="text-gray-700">Historical demand</span>
            </div>
          )}

          {summary.reasoningInputs.inventoryLevels && (
            <div className="flex items-center gap-2 text-sm">
              <Package className="w-4 h-4 text-gray-600" />
              <span className="text-gray-700">Inventory levels</span>
            </div>
          )}

          {summary.reasoningInputs.aiInsights && (
            <div className="flex items-center gap-2 text-sm">
              <Brain className="w-4 h-4 text-purple-600" />
              <span className="text-gray-700 font-medium">AI optimization</span>
            </div>
          )}
        </div>
      </div>

      {/* Actions Required Footer */}
      {summary.userActionsRequired > 0 && (
        <div className="mt-4 p-4 bg-amber-50 border border-amber-200 rounded-lg">
          <div className="flex items-center gap-2">
            <FileText className="w-5 h-5 text-amber-600" />
            <p className="text-sm font-medium text-amber-900">
              {summary.userActionsRequired} item{summary.userActionsRequired !== 1 ? 's' : ''} need
              {summary.userActionsRequired === 1 ? 's' : ''} your approval before proceeding
            </p>
          </div>
        </div>
      )}
    </div>
  );
}