import 'dart:async';
import 'package:flutter/widgets.dart';
import 'package:get/src/get_main.dart';
import 'rx_impl.dart';
import 'rx_interface.dart';

class ListViewX<T extends RxController> extends StatefulWidget {
  final Widget Function(T, int) builder;
  final bool global;
  final ListX Function(T) list;
  final bool autoRemove;
  final void Function(State state) initState, dispose, didChangeDependencies;
  final T init;
  final int itemCount;
  ListViewX({
    this.builder,
    this.global = true,
    this.autoRemove = true,
    this.initState,
    @required this.list,
    this.itemCount,
    this.dispose,
    this.didChangeDependencies,
    this.init,
  });
  _ListViewXState<T> createState() => _ListViewXState<T>();
}

class _ListViewXState<T extends RxController> extends State<ListViewX<T>> {
  RxInterface _observer;
  StreamSubscription _listenSubscription;
  T controller;

  _ListViewXState() {
    _observer = ListX();
  }

  @override
  void initState() {
    if (widget.global) {
      if (Get.isRegistred<T>()) {
        controller = Get.find<T>();
      } else {
        controller = widget.init;
        Get.put<T>(controller);
      }
    } else {
      controller = widget.init;
    }
    if (widget.initState != null) widget.initState(this);
    try {
      controller?.onInit();
    } catch (e) {
      if (Get.isLogEnable) print("Failure on call onInit");
    }

    _listenSubscription = widget.list.call(controller).listen((data) {
      setState(() {});
    });
    super.initState();
  }

  @override
  void dispose() {
    controller?.close();
    _listenSubscription?.cancel();
    _observer?.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    _observer.close();
    final observer = Get.obs;
    Get.obs = this._observer;
    final result = ListView.builder(
        itemCount: widget.itemCount ?? widget.list.call(controller).length,
        itemBuilder: (context, index) {
          return widget.builder(controller, index);
        });
    Get.obs = observer;
    return result;
  }
}