"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 { SimActions } from "./SimActions";
import { apiClient } from "@/lib/api";
import { SimFeatureToggles } from "./SimFeatureToggles";

interface SimManagementSectionProps {
  subscriptionId: number;
}

interface SimInfo {
  details: SimDetails;
}

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 response = await apiClient.GET("/api/subscriptions/{id}/sim", {
        params: { path: { id: subscriptionId } },
      });

      const payload = response.data as { details: SimDetails; usage: any } | undefined;

      if (!payload) {
        throw new Error("Failed to load SIM information");
      }

      // Only use the details part, ignore usage data
      setSimInfo({ details: payload.details });
    } 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-6">
      {/* Header Section */}
      <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold text-gray-900">
              {simInfo.details.simType === "esim" ? "eSIM" : "Physical SIM"} Service
            </h1>
            <p className="text-gray-600 mt-1">Subscription ID {subscriptionId}</p>
          </div>
          <span className="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium bg-green-100 text-green-800">
            {simInfo.details.status.charAt(0).toUpperCase() + simInfo.details.status.slice(1)}
          </span>
        </div>
      </div>

      {/* Two Column Layout */}
      <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
        {/* Left Column - Main Actions */}
        <div className="lg:col-span-2 space-y-6">
          {/* Subscription Details Card */}
          <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
            <div className="mb-4">
              <h2 className="text-lg font-semibold text-gray-900">Subscription Details</h2>
            </div>
            <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
              <div className="text-center">
                <p className="text-sm text-gray-500 uppercase tracking-wide">Monthly Cost</p>
                <p className="text-lg font-semibold text-gray-900">¥3,100</p>
              </div>
              <div className="text-center">
                <p className="text-sm text-gray-500 uppercase tracking-wide">Next Billing</p>
                <p className="text-lg font-semibold text-gray-900">Jul 1, 2024</p>
              </div>
              <div className="text-center">
                <p className="text-sm text-gray-500 uppercase tracking-wide">Registration</p>
                <p className="text-lg font-semibold text-gray-900">Aug 2, 2023</p>
              </div>
            </div>
          </div>

          {/* SIM Management Actions Card */}
          <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
            <div className="mb-4">
              <h2 className="text-lg font-semibold text-gray-900">SIM Management Actions</h2>
            </div>
            <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>

          {/* Voice Status Card */}
          <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
            <div className="mb-4">
              <h2 className="text-lg font-semibold text-gray-900">Voice Status</h2>
            </div>
            <SimFeatureToggles
              subscriptionId={subscriptionId}
              voiceMailEnabled={simInfo.details.voiceMailEnabled}
              callWaitingEnabled={simInfo.details.callWaitingEnabled}
              internationalRoamingEnabled={simInfo.details.internationalRoamingEnabled}
              networkType={simInfo.details.networkType}
              onChanged={handleActionSuccess}
              embedded
            />
          </div>
        </div>

        {/* Right Column - SIM Details & Usage */}
        <div className="space-y-6">
          {/* SIM Details Card */}
          <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
            <div className="mb-4">
              <h2 className="text-lg font-semibold text-gray-900">SIM Details</h2>
            </div>
            <SimDetailsCard
              simDetails={simInfo.details}
              isLoading={false}
              error={null}
              embedded={true}
              showFeaturesSummary={false}
            />
          </div>
        </div>
      </div>

    </div>
  );
}