"use client";

import React, { useEffect, useMemo, useState } from "react";
import { authenticatedApi } from "@/lib/api";

interface SimFeatureTogglesProps {
  subscriptionId: number;
  voiceMailEnabled?: boolean;
  callWaitingEnabled?: boolean;
  internationalRoamingEnabled?: boolean;
  networkType?: string; // '4G' | '5G'
  onChanged?: () => void;
  embedded?: boolean; // when true, render without outer card wrappers
}

export function SimFeatureToggles({
  subscriptionId,
  voiceMailEnabled,
  callWaitingEnabled,
  internationalRoamingEnabled,
  networkType,
  onChanged,
  embedded = false,
}: SimFeatureTogglesProps) {
  // Initial values
  const initial = useMemo(() => ({
    vm: !!voiceMailEnabled,
    cw: !!callWaitingEnabled,
    ir: !!internationalRoamingEnabled,
    nt: networkType === '5G' ? '5G' : '4G',
  }), [voiceMailEnabled, callWaitingEnabled, internationalRoamingEnabled, networkType]);

  // Working values
  const [vm, setVm] = useState(initial.vm);
  const [cw, setCw] = useState(initial.cw);
  const [ir, setIr] = useState(initial.ir);
  const [nt, setNt] = useState<'4G' | '5G'>(initial.nt as '4G' | '5G');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState<string | null>(null);

  useEffect(() => {
    setVm(initial.vm);
    setCw(initial.cw);
    setIr(initial.ir);
    setNt(initial.nt as '4G' | '5G');
  }, [initial.vm, initial.cw, initial.ir, initial.nt]);

  const reset = () => {
    setVm(initial.vm);
    setCw(initial.cw);
    setIr(initial.ir);
    setNt(initial.nt as '4G' | '5G');
    setError(null);
    setSuccess(null);
  };

  const applyChanges = async () => {
    setLoading(true);
    setError(null);
    setSuccess(null);
    try {
      const featurePayload: any = {};
      if (vm !== initial.vm) featurePayload.voiceMailEnabled = vm;
      if (cw !== initial.cw) featurePayload.callWaitingEnabled = cw;
      if (ir !== initial.ir) featurePayload.internationalRoamingEnabled = ir;
      if (nt !== initial.nt) featurePayload.networkType = nt;

      if (Object.keys(featurePayload).length > 0) {
        await authenticatedApi.post(`/subscriptions/${subscriptionId}/sim/features`, featurePayload);
      }

      setSuccess('Changes submitted successfully');
      onChanged?.();
    } catch (e: any) {
      setError(e instanceof Error ? e.message : 'Failed to submit changes');
    } finally {
      setLoading(false);
      setTimeout(() => setSuccess(null), 3000);
    }
  };

  return (
    <div className="space-y-6">

      {/* Service Options */}
      <div className={`${embedded ? '' : 'bg-white rounded-xl border border-gray-200 overflow-hidden'}`}>

        <div className={`${embedded ? '' : 'p-6'} space-y-6`}>
          {/* Voice Mail */}
          <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between space-y-4 lg:space-y-0 p-4 bg-gray-50 rounded-lg border border-gray-200">
            <div className="flex-1">
              <div className="flex items-center space-x-3">
                <div className="bg-blue-100 rounded-lg p-2">
                  <svg className="h-4 w-4 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 5a2 2 0 012-2h3.28a1 1 0 01.948.684l1.498 4.493a1 1 0 01-.502 1.21l-2.257 1.13a11.042 11.042 0 005.516 5.516l1.13-2.257a1 1 0 011.21-.502l4.493 1.498a1 1 0 01.684.949V19a2 2 0 01-2 2h-1C9.716 21 3 14.284 3 6V5z" />
                  </svg>
                </div>
                <div>
                  <div className="text-sm font-semibold text-gray-900">Voice Mail</div>
                  <div className="text-xs text-gray-600">¥300/month</div>
                </div>
              </div>
            </div>
            <div className="flex items-center space-x-4">
              <div className="text-sm">
                <span className="text-gray-500">Current: </span>
                <span className={`font-medium ${initial.vm ? 'text-green-600' : 'text-gray-600'}`}>
                  {initial.vm ? 'Enabled' : 'Disabled'}
                </span>
              </div>
              <div className="text-gray-400">→</div>
              <select
                value={vm ? 'Enabled' : 'Disabled'}
                onChange={(e) => setVm(e.target.value === 'Enabled')}
                className="block w-32 rounded-lg border border-gray-200 bg-white text-sm text-gray-700 focus:border-blue-500 focus:ring-1 focus:ring-blue-500 focus:outline-none transition-colors hover:border-gray-300"
              >
                <option>Disabled</option>
                <option>Enabled</option>
              </select>
            </div>
          </div>

          {/* Call Waiting */}
          <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between space-y-4 lg:space-y-0 p-4 bg-gray-50 rounded-lg border border-gray-200">
            <div className="flex-1">
              <div className="flex items-center space-x-3">
                <div className="bg-purple-100 rounded-lg p-2">
                  <svg className="h-4 w-4 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z" />
                  </svg>
                </div>
                <div>
                  <div className="text-sm font-semibold text-gray-900">Call Waiting</div>
                  <div className="text-xs text-gray-600">¥300/month</div>
                </div>
              </div>
            </div>
            <div className="flex items-center space-x-4">
              <div className="text-sm">
                <span className="text-gray-500">Current: </span>
                <span className={`font-medium ${initial.cw ? 'text-green-600' : 'text-gray-600'}`}>
                  {initial.cw ? 'Enabled' : 'Disabled'}
                </span>
              </div>
              <div className="text-gray-400">→</div>
              <select
                value={cw ? 'Enabled' : 'Disabled'}
                onChange={(e) => setCw(e.target.value === 'Enabled')}
                className="block w-32 rounded-lg border border-gray-200 bg-white text-sm text-gray-700 focus:border-blue-500 focus:ring-1 focus:ring-blue-500 focus:outline-none transition-colors hover:border-gray-300"
              >
                <option>Disabled</option>
                <option>Enabled</option>
              </select>
            </div>
          </div>

          {/* International Roaming */}
          <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between space-y-4 lg:space-y-0 p-4 bg-gray-50 rounded-lg border border-gray-200">
            <div className="flex-1">
              <div className="flex items-center space-x-3">
                <div className="bg-green-100 rounded-lg p-2">
                  <svg className="h-4 w-4 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3.055 11H5a2 2 0 012 2v1a2 2 0 002 2 2 2 0 012 2v2.945M8 3.935V5.5A2.5 2.5 0 0010.5 8h.5a2 2 0 012 2 2 2 0 104 0 2 2 0 012-2h1.064M15 20.488V18a2 2 0 012-2h3.064M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
                  </svg>
                </div>
                <div>
                  <div className="text-sm font-semibold text-gray-900">International Roaming</div>
                  <div className="text-xs text-gray-600">Global connectivity</div>
                </div>
              </div>
            </div>
            <div className="flex items-center space-x-4">
              <div className="text-sm">
                <span className="text-gray-500">Current: </span>
                <span className={`font-medium ${initial.ir ? 'text-green-600' : 'text-gray-600'}`}>
                  {initial.ir ? 'Enabled' : 'Disabled'}
                </span>
              </div>
              <div className="text-gray-400">→</div>
              <select
                value={ir ? 'Enabled' : 'Disabled'}
                onChange={(e) => setIr(e.target.value === 'Enabled')}
                className="block w-32 rounded-lg border border-gray-200 bg-white text-sm text-gray-700 focus:border-blue-500 focus:ring-1 focus:ring-blue-500 focus:outline-none transition-colors hover:border-gray-300"
              >
                <option>Disabled</option>
                <option>Enabled</option>
              </select>
            </div>
          </div>

          {/* Network Type */}
          <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between space-y-4 lg:space-y-0 p-4 bg-gray-50 rounded-lg border border-gray-200">
            <div className="flex-1">
              <div className="flex items-center space-x-3">
                <div className="bg-orange-100 rounded-lg p-2">
                  <svg className="h-4 w-4 text-orange-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8.111 16.404a5.5 5.5 0 017.778 0M12 20h.01m-7.08-7.071c3.904-3.905 10.236-3.905 14.141 0M1.394 9.393c5.857-5.857 15.355-5.857 21.213 0" />
                  </svg>
                </div>
                <div>
                  <div className="text-sm font-semibold text-gray-900">Network Type</div>
                  <div className="text-xs text-gray-600">4G/5G connectivity</div>
                </div>
              </div>
            </div>
            <div className="flex items-center space-x-4">
              <div className="text-sm">
                <span className="text-gray-500">Current: </span>
                <span className="font-medium text-blue-600">{initial.nt}</span>
              </div>
              <div className="text-gray-400">→</div>
              <select
                value={nt}
                onChange={(e) => setNt(e.target.value as '4G' | '5G')}
                className="block w-20 rounded-lg border border-gray-200 bg-white text-sm text-gray-700 focus:border-blue-500 focus:ring-1 focus:ring-blue-500 focus:outline-none transition-colors hover:border-gray-300"
              >
                <option value="4G">4G</option>
                <option value="5G">5G</option>
              </select>
            </div>
          </div>
        </div>
      </div>

      {/* Notes and Actions */}
      <div className={`${embedded ? '' : 'bg-white rounded-xl border border-gray-200 p-6'}`}>
        <div className="bg-yellow-50 border border-yellow-200 rounded-lg p-4 mb-6">
          <div className="flex items-start">
            <svg className="h-5 w-5 text-yellow-600 mt-0.5 mr-3 flex-shrink-0" 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 className="space-y-2 text-sm text-yellow-800">
              <p><strong>Important Notes:</strong></p>
              <ul className="list-disc list-inside space-y-1 ml-4">
                <li>Changes will take effect instantaneously (approx. 30min)</li>
                <li>May require smartphone/device restart after changes are applied</li>
                <li>5G requires a compatible smartphone/device. Will not function on 4G devices</li>
                <li>Changes to Voice Mail / Call Waiting must be requested before the 25th of the month</li>
              </ul>
            </div>
          </div>
        </div>

        {success && (
          <div className="mb-4 bg-green-50 border border-green-200 rounded-lg p-4">
            <div className="flex items-center">
              <svg className="h-5 w-5 text-green-500 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
              </svg>
              <p className="text-sm font-medium text-green-800">{success}</p>
            </div>
          </div>
        )}

        {error && (
          <div className="mb-4 bg-red-50 border border-red-200 rounded-lg p-4">
            <div className="flex items-center">
              <svg className="h-5 w-5 text-red-500 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L3.732 16.5c-.77.833.192 2.5 1.732 2.5z" />
              </svg>
              <p className="text-sm font-medium text-red-800">{error}</p>
            </div>
          </div>
        )}

        <div className="flex flex-col sm:flex-row gap-3">
          <button
            onClick={applyChanges}
            disabled={loading}
            className="flex-1 inline-flex items-center justify-center px-6 py-3 border border-transparent rounded-lg text-sm font-semibold text-white bg-gradient-to-r from-blue-600 to-blue-700 hover:from-blue-700 hover:to-blue-800 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 disabled:cursor-not-allowed transition-all duration-200"
          >
            {loading ? (
              <>
                <svg className="animate-spin -ml-1 mr-3 h-4 w-4 text-white" fill="none" viewBox="0 0 24 24">
                  <circle cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" className="opacity-25"></circle>
                  <path fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z" className="opacity-75"></path>
                </svg>
                Applying Changes...
              </>
            ) : (
              <>
                <svg className="h-4 w-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
                </svg>
                Apply Changes
              </>
            )}
          </button>
          <button
            onClick={reset}
            disabled={loading}
            className="inline-flex items-center justify-center px-6 py-3 border border-gray-300 rounded-lg text-sm font-semibold 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 disabled:cursor-not-allowed transition-colors duration-200"
          >
            <svg className="h-4 w-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
            </svg>
            Reset
          </button>
        </div>
      </div>
    </div>
  );
}