"use client";

import React, { useState, useEffect, useCallback } 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";
import { SimFeatureToggles } from "./SimFeatureToggles";

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 = useCallback(async () => {
    try {
      setError(null);

      const data = await authenticatedApi.get<{
        details: SimDetails;
        usage: SimUsage;
      }>(`/subscriptions/${subscriptionId}/sim`);

      setSimInfo(data);
    } catch (err: unknown) {
      const hasStatus = (v: unknown): v is { status: number } =>
        typeof v === "object" &&
        v !== null &&
        "status" in v &&
        typeof (v as { status: unknown }).status === "number";
      if (hasStatus(err) && err.status === 400) {
        // Not a SIM subscription - this component shouldn't be shown
        setError("This subscription is not a SIM service");
      } else {
        setError(err instanceof Error ? err.message : "Failed to load SIM information");
      }
    } finally {
      setLoading(false);
    }
  }, [subscriptionId]);

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

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

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

  if (loading) {
    return (
      <div className="space-y-8">
        <div className="bg-white shadow-lg rounded-xl border border-gray-100 p-8">
          <div className="flex items-center mb-6">
            <div className="bg-blue-50 rounded-xl p-2 mr-4">
              <DevicePhoneMobileIcon className="h-6 w-6 text-blue-600" />
            </div>
            <div>
              <h2 className="text-2xl font-bold text-gray-900">SIM Management</h2>
              <p className="text-gray-600 mt-1">Loading your SIM service details...</p>
            </div>
          </div>
          <div className="animate-pulse space-y-6">
            <div className="h-6 bg-gradient-to-r from-gray-200 to-gray-300 rounded-lg w-3/4"></div>
            <div className="h-5 bg-gradient-to-r from-gray-200 to-gray-300 rounded-lg w-1/2"></div>
            <div className="h-48 bg-gradient-to-r from-gray-200 to-gray-300 rounded-xl"></div>
            <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
              <div className="h-32 bg-gradient-to-r from-gray-200 to-gray-300 rounded-xl"></div>
              <div className="h-32 bg-gradient-to-r from-gray-200 to-gray-300 rounded-xl"></div>
            </div>
          </div>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="bg-white shadow-lg rounded-xl border border-red-100 p-8">
        <div className="flex items-center mb-6">
          <div className="bg-blue-50 rounded-xl p-2 mr-4">
            <DevicePhoneMobileIcon className="h-6 w-6 text-blue-600" />
          </div>
          <div>
            <h2 className="text-2xl font-bold text-gray-900">SIM Management</h2>
            <p className="text-gray-600 mt-1">Unable to load SIM information</p>
          </div>
        </div>
        <div className="text-center py-12">
          <div className="bg-red-50 rounded-full p-4 w-20 h-20 mx-auto mb-6">
            <ExclamationTriangleIcon className="h-12 w-12 text-red-500 mx-auto" />
          </div>
          <h3 className="text-xl font-semibold text-gray-900 mb-3">
            Unable to Load SIM Information
          </h3>
          <p className="text-gray-600 mb-8 max-w-md mx-auto">{error}</p>
          <button
            onClick={handleRefresh}
            className="inline-flex items-center px-6 py-3 border border-transparent text-sm font-semibold rounded-xl text-white bg-gradient-to-r from-blue-600 to-blue-700 hover:from-blue-700 hover:to-blue-800 hover:shadow-lg hover:scale-105 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 transition-all duration-200"
          >
            <ArrowPathIcon className="h-5 w-5 mr-2" />
            Retry
          </button>
        </div>
      </div>
    );
  }

  if (!simInfo) {
    return null;
  }

  return (
    <div id="sim-management" className="space-y-8">
      {/* SIM Details and Usage - Main Content */}
      <div className="grid grid-cols-1 xl:grid-cols-3 gap-8">
        {/* Main Content Area - Actions and Settings (Left Side) */}
        <div className="order-2 xl:col-span-2 xl:order-1">
          <div className="bg-white shadow-lg rounded-xl border border-gray-100 p-6">
            <SimActions
              subscriptionId={subscriptionId}
              simType={simInfo.details.simType}
              status={simInfo.details.status}
              currentPlanCode={simInfo.details.planCode}
              onTopUpSuccess={handleActionSuccess}
              onPlanChangeSuccess={handleActionSuccess}
              onCancelSuccess={handleActionSuccess}
              onReissueSuccess={handleActionSuccess}
              embedded={true}
            />
            <div className="mt-6">
              <p className="text-sm text-gray-600 font-medium mb-3">Modify service options</p>
              <SimFeatureToggles
                subscriptionId={subscriptionId}
                voiceMailEnabled={simInfo.details.voiceMailEnabled}
                callWaitingEnabled={simInfo.details.callWaitingEnabled}
                internationalRoamingEnabled={simInfo.details.internationalRoamingEnabled}
                networkType={simInfo.details.networkType}
                onChanged={handleActionSuccess}
                embedded
              />
            </div>
          </div>
        </div>

        {/* Sidebar - Compact Info (Right Side) */}
        <div className="order-1 xl:order-2 space-y-8">
          {/* Details + Usage combined card for mobile-first */}
          <div className="bg-white shadow-lg rounded-xl border border-gray-100 p-6 space-y-6">
            <SimDetailsCard
              simDetails={simInfo.details}
              isLoading={false}
              error={null}
              embedded={true}
              showFeaturesSummary={false}
            />
            <DataUsageChart
              usage={simInfo.usage}
              remainingQuotaMb={simInfo.details.remainingQuotaMb}
              isLoading={false}
              error={null}
              embedded={true}
            />
          </div>

          {/* Important Information Card */}
          <div className="bg-gradient-to-br from-blue-50 to-blue-100 border border-blue-200 rounded-xl p-6">
            <div className="flex items-center mb-4">
              <div className="bg-blue-200 rounded-lg p-2 mr-3">
                <svg
                  className="h-5 w-5 text-blue-600"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={2}
                    d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"
                  />
                </svg>
              </div>
              <h3 className="text-lg font-semibold text-blue-900">Important Information</h3>
            </div>
            <ul className="space-y-2 text-sm text-blue-800">
              <li className="flex items-start">
                <span className="inline-block w-1.5 h-1.5 bg-blue-600 rounded-full mt-2 mr-3 flex-shrink-0"></span>
                Data usage is updated in real-time and may take a few minutes to reflect recent
                activity
              </li>
              <li className="flex items-start">
                <span className="inline-block w-1.5 h-1.5 bg-blue-600 rounded-full mt-2 mr-3 flex-shrink-0"></span>
                Top-up data will be available immediately after successful processing
              </li>
              <li className="flex items-start">
                <span className="inline-block w-1.5 h-1.5 bg-blue-600 rounded-full mt-2 mr-3 flex-shrink-0"></span>
                SIM cancellation is permanent and cannot be undone
              </li>
              {simInfo.details.simType === "esim" && (
                <li className="flex items-start">
                  <span className="inline-block w-1.5 h-1.5 bg-blue-600 rounded-full mt-2 mr-3 flex-shrink-0"></span>
                  eSIM profile reissue will provide a new QR code for activation
                </li>
              )}
            </ul>
          </div>

          {/* (On desktop, details+usage are above; on mobile they appear first since this section is above actions) */}
        </div>
      </div>
    </div>
  );
}