import 'dart:convert' show base64Decode;

import 'package:flutter/material.dart';
import 'package:fotodocumentation/controller/base_controller.dart';
import 'package:fotodocumentation/controller/customer_controller.dart';
import 'package:fotodocumentation/controller/picture_controller.dart';
import 'package:fotodocumentation/dto/customer_dto.dart';
import 'package:fotodocumentation/dto/picture_dto.dart';
import 'package:fotodocumentation/l10n/app_localizations.dart';
import 'package:fotodocumentation/pages/ui_utils/component/customer_back_button.dart';
import 'package:fotodocumentation/pages/customer/picture_delete_dialog.dart';
import 'package:fotodocumentation/pages/ui_utils/component/general_error_widget.dart';
import 'package:fotodocumentation/pages/ui_utils/component/page_header_widget.dart';
import 'package:fotodocumentation/pages/ui_utils/component/waiting_widget.dart';
import 'package:fotodocumentation/pages/ui_utils/general_style.dart';
import 'package:fotodocumentation/utils/di_container.dart';
import 'package:fotodocumentation/utils/global_router.dart';
import 'package:go_router/go_router.dart';
import 'package:intl/intl.dart';

class CustomerWidget extends StatefulWidget {
  final int customerId;
  const CustomerWidget({super.key, required this.customerId});

  @override
  State<CustomerWidget> createState() => _CustomerWidgetState();
}

class _CustomerWidgetState extends State<CustomerWidget> {
  CustomerController get _customerController => DiContainer.get();
  PictureController get _pictureController => DiContainer.get();
  GeneralStyle get _generalStyle => DiContainer.get();

  late Future<CustomerDto?> _dto;
  late DateFormat _dateFormat;

  @override
  void initState() {
    super.initState();
    _dateFormat = DateFormat('dd MMMM yyyy');
    _dto = _customerController.get(id: widget.customerId);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        color: _generalStyle.pageBackgroundColor,
        child: Padding(
          padding: const EdgeInsets.only(top: 8.0, left: 50.0, right: 50.0, bottom: 8.0),
          child: _body(context),
        ),
      ),
    );
  }

  Widget _body(BuildContext context) {
    return FutureBuilder<CustomerDto?>(
      future: _dto,
      builder: (BuildContext context, AsyncSnapshot<CustomerDto?> snapshot) {
        if (snapshot.connectionState != ConnectionState.done) {
          return const WaitingWidget();
        }
        if (snapshot.hasData) {
          CustomerDto? dto = snapshot.data;

          return _mainWidget(dto);
        } else if (snapshot.hasError) {
          var error = snapshot.error;
          return (error is ServerError) ? GeneralErrorWidget.fromServerError(error) : GeneralErrorWidget(error: snapshot.error.toString());
        }
        return const WaitingWidget();
      },
    );
  }

  Widget _mainWidget(CustomerDto? dto) {
    if (dto == null) {
      return Text(
        AppLocalizations.of(context)!.customerWidgetNotFound,
        style: TextStyle(
          fontFamily: _generalStyle.fontFamily,
          fontWeight: FontWeight.bold,
          fontSize: 20,
          color: _generalStyle.secondaryWidgetBackgroundColor,
        ),
      );
    }

    var subText = AppLocalizations.of(context)!.customerWidgetCustomerNumberPrefix(dto.customerNumber);
    return Column(
      mainAxisAlignment: MainAxisAlignment.start,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        PageHeaderWidget(text: dto.name, subText: subText),
        CustomerBackButton(path: GlobalRouter.pathHome),
        Row(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            _downloadButton(context),
          ],
        ),
        const SizedBox(height: 24),
        Expanded(
          child: _customerWidget(dto),
        ),
      ],
    );
  }

  Widget _customerWidget(CustomerDto customerDto) {
    var pictureDtos = customerDto.pictures;

    pictureDtos.sort((a, b) => b.pictureDate.compareTo(a.pictureDate));

    return Card(
      margin: EdgeInsets.zero,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        children: [
          _tableHeaderRow(context),
          Divider(thickness: 2, height: 1, color: _generalStyle.secondaryWidgetBackgroundColor),
          Expanded(
            child: ListView.separated(
              padding: const EdgeInsets.only(top: 8.0),
              itemCount: pictureDtos.length,
              itemBuilder: (BuildContext context, int index) {
                return _tableDataRow(context, customerDto, pictureDtos[index]);
              },
              separatorBuilder: (BuildContext context, int index) => Divider(color: _generalStyle.secondaryWidgetBackgroundColor),
            ),
          ),
        ],
      ),
    );
  }

  Widget _tableHeaderRow(BuildContext context) {
    final headerStyle = TextStyle(
      fontFamily: _generalStyle.fontFamily,
      fontWeight: FontWeight.bold,
      fontSize: 20,
      color: _generalStyle.secondaryWidgetBackgroundColor,
    );

    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Expanded(
            flex: 1,
            child: Align(
              alignment: Alignment.centerLeft,
              child: Text(
                AppLocalizations.of(context)!.customerWidgetHeaderFoto,
                style: headerStyle,
              ),
            ),
          ),
          Expanded(
            flex: 3,
            child: Align(
              alignment: Alignment.centerLeft,
              child: Text(
                AppLocalizations.of(context)!.customerWidgetHeaderComment,
                style: headerStyle,
              ),
            ),
          ),
          Expanded(
            flex: 1,
            child: Align(
              alignment: Alignment.centerLeft,
              child: Text(
                'Bewertung',
                style: headerStyle,
              ),
            ),
          ),
          Expanded(
            flex: 2,
            child: Align(
              alignment: Alignment.centerLeft,
              child: Text(
                AppLocalizations.of(context)!.customerWidgetHeaderUploadDate,
                style: headerStyle,
              ),
            ),
          ),
          const SizedBox(width: 96),
        ],
      ),
    );
  }

  Widget _tableDataRow(BuildContext context, CustomerDto customerDto, PictureDto pictureDto) {
    final dataStyle = TextStyle(
      fontFamily: _generalStyle.fontFamily,
      fontSize: 16.0,
      color: _generalStyle.secondaryTextLabelColor,
    );

    final dateStr = _dateFormat.format(pictureDto.pictureDate);
    final evaluationColor = _generalStyle.evaluationColor(value: pictureDto.evaluation);
    return InkWell(
      key: Key("table_row_${customerDto.id}"),
      onTap: () => _actionSelect(context, customerDto, pictureDto),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Expanded(
              flex: 1,
              child: Align(
                alignment: Alignment.centerLeft,
                child: ConstrainedBox(
                  constraints: const BoxConstraints(maxWidth: 70, maxHeight: 70),
                  child: Image.memory(
                    base64Decode(pictureDto.image),
                    fit: BoxFit.contain,
                  ),
                ),
              ),
            ),
            Expanded(
              flex: 3,
              child: Align(
                alignment: Alignment.centerLeft,
                child: Text(pictureDto.comment ?? "", style: dataStyle),
              ),
            ),
            Expanded(
              flex: 1,
              child: Align(
                alignment: Alignment.centerLeft,
                child: Container(
                  width: 20,
                  height: 20,
                  decoration: BoxDecoration(
                    color: evaluationColor,
                    shape: BoxShape.circle,
                  ),
                ),
              ),
            ),
            Expanded(
              flex: 2,
              child: Align(
                alignment: Alignment.centerLeft,
                child: Text(dateStr, style: dataStyle),
              ),
            ),
            SizedBox(
              width: 48,
              child: IconButton(
                key: Key("table_row_download_${pictureDto.id}"),
                icon: Icon(
                  Icons.file_download_outlined,
                  color: _generalStyle.loginFormTextLabelColor,
                ),
                onPressed: () => _actionDelete(context, customerDto, pictureDto),
              ),
            ),
            SizedBox(
              width: 48,
              child: IconButton(
                key: Key("table_row_delete_${customerDto.id}"),
                icon: Icon(
                  Icons.delete_outline,
                  color: _generalStyle.errorColor,
                ),
                onPressed: () => _actionDelete(context, customerDto, pictureDto),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _downloadButton(BuildContext context) {
    return ElevatedButton.icon(
      key: Key("download_all_button"),
      onPressed: () => _actionDownload(context),
      iconAlignment: IconAlignment.end,
      icon: Icon(
        Icons.file_download_outlined,
        color: _generalStyle.primaryButtonTextColor,
        size: 24,
      ),
      label: Text(
        "Alle herunterladen",
        style: TextStyle(
          fontFamily: _generalStyle.fontFamily,
          fontWeight: FontWeight.bold,
          fontSize: 16,
          color: _generalStyle.primaryButtonTextColor,
        ),
      ),
      style: ElevatedButton.styleFrom(
        backgroundColor: _generalStyle.secondaryWidgetBackgroundColor,
        elevation: 0,
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
        shape: const StadiumBorder(),
      ),
    );
  }

  Future<void> _actionDelete(BuildContext context, CustomerDto customerDto, PictureDto pictureDto) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (BuildContext context) {
        return PictureDeleteDialog();
      },
    );

    if (confirmed == true) {
      _pictureController.delete(pictureDto);
      setState(() {
        _dto = _customerController.get(id: widget.customerId);
      });
    }
  }

  Future<void> _actionSelect(BuildContext context, CustomerDto customerDto, PictureDto pictureDto) async {
    String uri = "${GlobalRouter.pathHome}${GlobalRouter.pathPicture}/${customerDto.id}/${pictureDto.id}"; 
    context.go(uri);
    setState(() {
      _dto = _customerController.get(id: widget.customerId);
    });
  }

  Future<void> _actionDownload(BuildContext context) async {
    // FIXME: implement a download from the export
  }
}