import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:pmd/utils/debounce.dart';
import 'package:pmd/home_page/bloc/bloc.dart';
import 'package:pmd/home_page/bloc/events.dart';
import 'package:pmd/home_page/bloc/state.dart';
import 'package:pmd/models/card_data.dart';
import 'package:pmd/details_page/details_page.dart';
import 'package:pmd/data/repositories/api_interface.dart';

import 'package:pmd/data/repositories/mock_repository.dart';
import '../data/repositories/potter_repository.dart';

part 'card.dart';

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final TextEditingController _searchController = TextEditingController();
  final _scrollController = ScrollController();

  @override
  void initState() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<HomeBloc>().add(const HomeLoadDataEvent());
    });

    _scrollController.addListener(_onNextPageListener);
    super.initState();
  }

  @override
  void dispose() {
    _searchController.dispose();
    _scrollController.dispose();
    super.dispose();
  }

  void _onNextPageListener() {
    if (_scrollController.offset >=
        _scrollController.position.maxScrollExtent) {
      final bloc = context.read<HomeBloc>();
      if (!bloc.state.isPaginationLoading) {
        bloc.add(HomeLoadDataEvent(
            search: _searchController.text,
            nextPage: bloc.state.data?.nextPage));
      }
    }
  }

  Future<void> _onRefresh() {
    context
        .read<HomeBloc>()
        .add(HomeLoadDataEvent(search: _searchController.text));

    return Future.value(null);
  }

  void _onSearchInputChange(search) {
    Debounce.run(
        action: () =>
            context.read<HomeBloc>().add(HomeLoadDataEvent(search: search)));
  }

  void _showSnackBar(BuildContext context, String text) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text(text),
        duration: const Duration(seconds: 2),
        backgroundColor: Colors.black54,
      ));
    });
  }

  void _navigateToDetailsPage(BuildContext context, CardData data) {
    Navigator.push(
      context,
      CupertinoPageRoute(builder: (context) => DetailsPage(data: data)),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Column(
        children: [
          Padding(
            padding:
                const EdgeInsets.only(right: 30, left: 30, top: 20, bottom: 20),
            child: CupertinoSearchTextField(
              controller: _searchController,
              onChanged: _onSearchInputChange,
            ),
          ),
          BlocBuilder<HomeBloc, HomeState>(
            builder: (context, state) => state.error != null
                ? Text(
                    state.error ?? "",
                    style: Theme.of(context)
                        .textTheme
                        .headlineSmall
                        ?.copyWith(color: Colors.red),
                  )
                : state.isLoading
                    ? const Padding(
                        padding: EdgeInsets.only(top: 20),
                        child: CircularProgressIndicator(),
                      )
                    : Expanded(
                        child: RefreshIndicator(
                          onRefresh: _onRefresh,
                          child: ListView.separated(
                            controller: _scrollController,
                            padding: const EdgeInsets.symmetric(
                                vertical: 20, horizontal: 30),
                            separatorBuilder: (context, index) =>
                                const SizedBox(height: 20),
                            itemCount: state.data?.data?.length ?? 0,
                            itemBuilder: (context, index) {
                              final data = state.data?.data?[index];

                              return data == null
                                  ? const SizedBox.shrink()
                                  : _Card.fromData(
                                      data,
                                      onLike: (String text) =>
                                          _showSnackBar(context, text),
                                      onTap: () =>
                                          _navigateToDetailsPage(context, data),
                                    );
                            },
                          ),
                        ),
                      ),
          ),
          BlocBuilder<HomeBloc, HomeState>(
            builder: (context, state) => state.isPaginationLoading
                ? const CircularProgressIndicator()
                : const SizedBox.shrink(),
          ),
        ],
      ),
    );
  }
}