import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:hadi_hoda_flutter/common_ui/resources/my_assets.dart';
import 'package:hadi_hoda_flutter/common_ui/resources/my_spaces.dart';
import 'package:hadi_hoda_flutter/common_ui/resources/my_text_style.dart';
import 'package:hadi_hoda_flutter/core/routers/my_routes.dart';
import 'package:hadi_hoda_flutter/core/status/base_status.dart';
import 'package:hadi_hoda_flutter/core/utils/convert_size.dart';
import 'package:hadi_hoda_flutter/core/utils/my_localization.dart';
import 'package:hadi_hoda_flutter/core/utils/screen_size.dart';
import 'package:hadi_hoda_flutter/core/widgets/error/error_state.dart';
import 'package:hadi_hoda_flutter/core/widgets/images/my_image.dart';
import 'package:hadi_hoda_flutter/features/download/domain/entities/download_entity.dart';
import 'package:hadi_hoda_flutter/features/download/presentation/bloc/download_bloc.dart';
import 'package:hadi_hoda_flutter/features/download/presentation/bloc/download_event.dart';
import 'package:hadi_hoda_flutter/features/download/presentation/bloc/download_state.dart';
import 'package:hadi_hoda_flutter/features/download/presentation/ui/widgets/download_loading_widget.dart';

/// Download page that supports downloading any combination of media types.
///
/// Pass [config] to auto-start downloading specific types when the page opens.
/// If [config] is null, the page assumes the download was already triggered
/// externally and just shows the progress.
class DownloadPage extends StatefulWidget {
  final DownloadPageConfig config;

  const DownloadPage({super.key,required this.config});

  @override
  State<DownloadPage> createState() => _DownloadPageState();
}

class _DownloadPageState extends State<DownloadPage> {
  @override
  void initState() {
    super.initState();
    final bloc = context.read<DownloadBloc>();

    if (!bloc.isDownloading) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (mounted) {
          bloc.add(StartDownloadEvent(toLevel: widget.config.downloadToLevel));
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        height: context.heightScreen,
        width: context.widthScreen,
        decoration: BoxDecoration(
          gradient: const LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [Color(0XFF00154C), Color(0XFF150532)],
          ),
          image: DecorationImage(
            image: const AssetImage(MyAssets.pattern),
            scale: 3,
            repeat: ImageRepeat.repeat,
            colorFilter: ColorFilter.mode(
              Colors.white.withValues(alpha: 0.2),
              BlendMode.srcIn,
            ),
          ),
        ),
        child: BlocConsumer<DownloadBloc, DownloadState>(
          listener: (context, state) {
            if(state.status is BaseComplete) {
              if(widget.config.redirectTo == Routes.homePage) {
                context.goNamed(Routes.homePage);
              } else {
                context.pushNamed(
                  widget.config.redirectTo,
                  pathParameters: widget.config.routeParams,
                );
              }
            }
          },
          buildWhen: (previous, current) => previous.status != current.status,
          builder: (context, state) {
            if (state.status is BaseError) {
              return Padding(
                padding: EdgeInsets.symmetric(
                  vertical:
                      MediaQuery.viewPaddingOf(context).bottom + MySpaces.s16,
                  horizontal: 60,
                ),
                child: ErrorState(
                  onTap: () {
                    context.read<DownloadBloc>().add(
                      StartDownloadEvent(
                        toLevel: widget.config.downloadToLevel,
                      ),
                    );
                  },
                ),
              );
            } else {
              return Stack(
                alignment: Alignment.center,
                children: [_image(), _text(context), _loading(context)],
              );
            }
          },
        ),
      ),
    );
  }

  Widget _image() {
    return const Stack(
      children: [
        MyImage(image: MyAssets.hadiHoda),
        PositionedDirectional(
          start: MySpaces.s10,
          top: MySpaces.s40,
          child: MyImage(image: MyAssets.globe),
        ),
      ],
    );
  }

  Widget _text(BuildContext context) {
    return PositionedDirectional(
      bottom: 130,
      child: Column(
        spacing: MySpaces.s6,
        children: [
          Text(context.translate.please_wait, style: MYTextStyle.titr0),
          StreamBuilder<DownloadEntity>(
            initialData: DownloadEntity.empty(),
            stream: context.read<DownloadBloc>().loadingStream,
            builder: (context, snapshot) => Text(
              'Downloading ...${snapshot.data?.downloadedLevels}/${widget.config.downloadToLevel}',
              style: MYTextStyle.matn3,
            ),
          ),
        ],
      ),
    );
  }

  Positioned _loading(BuildContext context) {
    return Positioned(
      bottom: MySpaces.s40,
      child: DownloadLoadingWidget(
        loadingStream: context.read<DownloadBloc>().loadingStream,
      ),
    );
  }
}