"use client";

import React, { useState, useEffect } from 'react';
import { 
  DevicePhoneMobileIcon,
  ExclamationTriangleIcon,
  ArrowPathIcon
} from '@heroicons/react/24/outline';
import { SimDetailsCard, type SimDetails } from './SimDetailsCard';
import { DataUsageChart, type SimUsage } from './DataUsageChart';
import { SimActions } from './SimActions';
import { authenticatedApi } from '@/lib/api';

interface SimManagementSectionProps {
  subscriptionId: number;
}

interface SimInfo {
  details: SimDetails;
  usage: SimUsage;
}

export function SimManagementSection({ subscriptionId }: SimManagementSectionProps) {
  const [simInfo, setSimInfo] = useState<SimInfo | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const fetchSimInfo = async () => {
    try {
      setError(null);
      
      const data = await authenticatedApi.get<{
        details: SimDetails;
        usage: SimUsage;
      }>(`/subscriptions/${subscriptionId}/sim`);
      
      setSimInfo(data);
    } catch (error: any) {
      if (error.status === 400) {
        // Not a SIM subscription - this component shouldn't be shown
        setError('This subscription is not a SIM service');
      } else {
        setError(error instanceof Error ? error.message : 'Failed to load SIM information');
      }
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    fetchSimInfo();
  }, [subscriptionId]);

  const handleRefresh = () => {
    setLoading(true);
    fetchSimInfo();
  };

  const handleActionSuccess = () => {
    // Refresh SIM info after any successful action
    fetchSimInfo();
  };

  if (loading) {
    return (
      <div className="space-y-6">
        <div className="bg-white shadow rounded-lg p-6">
          <div className="flex items-center mb-4">
            <DevicePhoneMobileIcon className="h-6 w-6 text-blue-600 mr-3" />
            <h2 className="text-xl font-semibold text-gray-900">SIM Management</h2>
          </div>
          <div className="animate-pulse space-y-4">
            <div className="h-4 bg-gray-200 rounded w-3/4"></div>
            <div className="h-4 bg-gray-200 rounded w-1/2"></div>
            <div className="h-32 bg-gray-200 rounded"></div>
          </div>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="bg-white shadow rounded-lg p-6">
        <div className="flex items-center mb-4">
          <DevicePhoneMobileIcon className="h-6 w-6 text-blue-600 mr-3" />
          <h2 className="text-xl font-semibold text-gray-900">SIM Management</h2>
        </div>
        <div className="text-center py-8">
          <ExclamationTriangleIcon className="h-12 w-12 text-red-400 mx-auto mb-4" />
          <h3 className="text-lg font-medium text-gray-900 mb-2">Unable to Load SIM Information</h3>
          <p className="text-gray-600 mb-4">{error}</p>
          <button
            onClick={handleRefresh}
            className="inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
          >
            <ArrowPathIcon className="h-4 w-4 mr-2" />
            Retry
          </button>
        </div>
      </div>
    );
  }

  if (!simInfo) {
    return null;
  }

  return (
    <div className="space-y-6">
      {/* Section Header */}
      <div className="bg-white shadow rounded-lg p-6">
        <div className="flex items-center justify-between">
          <div className="flex items-center">
            <DevicePhoneMobileIcon className="h-6 w-6 text-blue-600 mr-3" />
            <div>
              <h2 className="text-xl font-semibold text-gray-900">SIM Management</h2>
              <p className="text-gray-600">Manage your SIM service and data usage</p>
            </div>
          </div>
          <button
            onClick={handleRefresh}
            disabled={loading}
            className="inline-flex items-center px-3 py-2 border border-gray-300 rounded-md text-sm font-medium text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50"
          >
            <ArrowPathIcon className={`h-4 w-4 mr-2 ${loading ? 'animate-spin' : ''}`} />
            Refresh
          </button>
        </div>
      </div>

      {/* SIM Details */}
      <SimDetailsCard 
        simDetails={simInfo.details}
        isLoading={false}
        error={null}
      />

      {/* Data Usage */}
      <DataUsageChart 
        usage={simInfo.usage}
        remainingQuotaMb={simInfo.details.remainingQuotaMb}
        isLoading={false}
        error={null}
      />

      {/* SIM Actions */}
      <SimActions
        subscriptionId={subscriptionId}
        simType={simInfo.details.simType}
        status={simInfo.details.status}
        onTopUpSuccess={handleActionSuccess}
        onPlanChangeSuccess={handleActionSuccess}
        onCancelSuccess={handleActionSuccess}
        onReissueSuccess={handleActionSuccess}
      />

      {/* Additional Information */}
      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
        <h3 className="text-sm font-medium text-blue-800 mb-2">Important Information</h3>
        <ul className="text-sm text-blue-700 space-y-1">
          <li>• Data usage is updated in real-time and may take a few minutes to reflect recent activity</li>
          <li>• Top-up data will be available immediately after successful processing</li>
          <li>• SIM cancellation is permanent and cannot be undone</li>
          {simInfo.details.simType === 'esim' && (
            <li>• eSIM profile reissue will provide a new QR code for activation</li>
          )}
        </ul>
      </div>
    </div>
  );
}