import 'dart:async';
import 'dart:io';

import 'package:downloads_path_provider/downloads_path_provider.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:intl/intl.dart';
import 'package:open_file/open_file.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/language_model.dart';
import 'package:fcs/model/report_model.dart';
import 'package:fcs/pages/util.dart';
import 'package:fcs/theme/theme.dart';
import 'package:fcs/vo/report.dart';
import 'package:fcs/widget/my_data_table.dart';
import 'package:fcs/widget/progress.dart';

import 'report_field_list_page.dart';
import 'report_filter_list_page.dart';

class ReportsDataTable extends StatefulWidget {
  final Report report;
  ReportsDataTable({this.report});
  @override
  _ReportsDataTableState createState() => _ReportsDataTableState();
}

class _ReportsDataTableState extends State<ReportsDataTable> {
  Report report;
  int limit = 20;
  int offset = 0;
  final numberFormatter = new NumberFormat("#,###");
  var dateFormatter = new DateFormat('dd MMM yyyy\nhh:mm:ss a');

  List _initialDisplayFields = [];
  List<Field> _initialFields = [];
  List _initialfieldList = [];

  List<Field> displayFields = [];
  List dataList = [];
  List cellfields = [];
  List fieldList = [];
  bool sort;
  bool _isLoading;
  int sortColumnIndex = 1;
  bool _endOfData;
  TargetPlatform platform;
  bool _permissionReady;
  String _localPath;

  @override
  void initState() {
    _controller = ScrollController();
    _controller.addListener(_scrollListener);

    super.initState();
    sort = false;
    _isLoading = true;
    _endOfData = false;
    _permissionReady = false;
    _load();
  }

  _prepare() async {
    platform = Theme.of(context).platform;

    _permissionReady = await _checkPermission();

    _localPath = (await _findLocalPath()) + Platform.pathSeparator + 'Download';

    final savedDir = Directory(_localPath);
    bool hasExisted = await savedDir.exists();
    if (!hasExisted) {
      savedDir.create();
    }
  }

  Future<bool> _checkPermission() async {
    if (platform == TargetPlatform.android) {
      PermissionStatus permission = await PermissionHandler()
          .checkPermissionStatus(PermissionGroup.storage);
      if (permission != PermissionStatus.granted) {
        Map<PermissionGroup, PermissionStatus> permissions =
            await PermissionHandler()
                .requestPermissions([PermissionGroup.storage]);
        if (permissions[PermissionGroup.storage] == PermissionStatus.granted) {
          return true;
        }
      } else {
        return true;
      }
    } else {
      return true;
    }
    return false;
  }

  _load() async {
    var reportModel = Provider.of<ReportModel>(context, listen: false);
    var data = await reportModel.getReport(widget.report.id);
    reportModel.getReport(widget.report.id).then((_report) {
      //  var data =  await reportModel.loadSelectedFieldsAndPosition(widget.report.id);
      reportModel.loadSelectedFieldsAndPosition(widget.report.id).then((value) {
        print("report value => $value");
        if (value != null) {
          _initialDisplayFields = value.fieldSelection;
          _initialFields = value.fieldPosition;
        } else {
          _initialDisplayFields = _report.displayFields;
          _initialFields = _report.fields;
        }

        _initialDisplayFields.asMap().forEach((key, value) {
          _initialFields.asMap().forEach((key, fvalue) {
            if (value == fvalue.name) {
              displayFields.add(fvalue);
              if (fvalue.aggFun != '') {
                var convertField = fvalue.name + '_' + fvalue.aggFun;
                cellfields.add(convertField);
              }
              if (fvalue.aggFun == '') {
                cellfields.add(value);
              }
            }
          });
          _initialfieldList.add(value);
        });
      });

      setState(() {
        this.report = _report;
      });

      _loadData();
    });
  }

  _loadData() {
    var reportModel = Provider.of<ReportModel>(context, listen: false);
    reportModel.getReportData(report, limit, offset).then((value) {
      setState(() {
        if (value == null || value.length < limit) {
          _endOfData = true;
        }
        dataList.addAll(value);
        _isLoading = false;
      });
    });
  }

  ScrollController _controller;

  _scrollListener() {
    if (_controller.offset >= _controller.position.maxScrollExtent &&
        !_controller.position.outOfRange) {
      setState(() {
        offset += limit;
        if (!_endOfData) _loadData();
      });
    }
  }

  Widget _buildPopupMenu() {
    return PopupMenuButton(
      onSelected: (s) {
        if (s == 1) {
          // var reportModel = Provider.of<ReportModel>(context, listen: false);
          // reportModel.downloadReportData(report);
          _download();
        } else if (s == 2) {}
      },
      itemBuilder: (context) => [
        PopupMenuItem(
          value: 1,
          child: Text("Download"),
        ),
        PopupMenuItem(
          value: 2,
          child: Text("Clear setting"),
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    var reportModel = Provider.of<ReportModel>(context, listen: false);
    fieldList = _initialfieldList;
    print("report fieldList => $fieldList");
    print("report sortColumnIndex => $sortColumnIndex");

    return LocalProgress(
      inAsyncCall: _isLoading,
      child: Scaffold(
        appBar: AppBar(
          actions: <Widget>[
            IconButton(
              onPressed: () {
                Navigator.of(context).push(MaterialPageRoute(
                    builder: (_) => ReportFilterListPage(report, (data) {
                          dataList = [];
                          setState(() {
                            dataList = data;
                          });
                        })));
              },
              iconSize: 30,
              icon: Icon(Icons.filter_list),
            ),
            IconButton(
              onPressed: () async {
                List flist = await Navigator.push<List>(
                  context,
                  MaterialPageRoute(
                      builder: (context) => ReportFieldListPage(
                            id: widget.report.id,
                            fields: report.fields,
                            selectedDisplayFields: fieldList,
                          )),
                );

                fieldList = [];
                cellfields = [];
                displayFields = [];
                setState(() {
                  fieldList = flist;
                  fieldList.asMap().forEach((key, value) {
                    _initialFields.asMap().forEach((key, fvalue) {
                      if (value == fvalue.name) {
                        displayFields.add(fvalue);
                        if (fvalue.aggFun != '') {
                          var convertField = fvalue.name + '_' + fvalue.aggFun;
                          cellfields.add(convertField);
                        }
                        if (fvalue.aggFun == '') {
                          cellfields.add(value);
                        }
                      }
                    });
                  });
                });
              },
              iconSize: 30,
              icon: Icon(Icons.list),
            ),
            _buildPopupMenu()
          ],
          backgroundColor: primaryColor,
          title: Text(
            report == null ? "" : report.display,
            style: Provider.of<LanguageModel>(context).isEng
                ? TextStyle(fontSize: 18)
                : TextStyle(fontSize: 18, fontFamily: 'MyanmarUnicode'),
          ),
        ),
        body: _isLoading
            ? Container()
            : SingleChildScrollView(
                controller: _controller,
                scrollDirection: Axis.vertical,
                child: SingleChildScrollView(
                  scrollDirection: Axis.horizontal,
                  child: MyDataTable(
                    columnSpacing: 10,
                    sortAscending: this.sort,
                    sortColumnIndex: this.sortColumnIndex,
                    columns: getReportColumn(reportModel, this.displayFields),
                    rows: getReportRow(this.dataList),
                    oddLine: tableRowOdd,
                    evenLine: tableRowEven,
                  ),
                ),
              ),
      ),
    );
  }

  onSortColumn(ReportModel reportModel, int columnIndex, bool ascending,
      String fieldName) {
    if (columnIndex == this.sortColumnIndex) {
      if (ascending) {
        var str = fieldName + " " + "asc";
        List sorts = [];
        sorts.add(str);
        this.report.id = widget.report.id;
        this.report.sorts = sorts;
        reportModel.getReportData(report, this.limit, 0).then((value) {
          setState(() {
            dataList = value;
            _isLoading = false;
            this.offset = 0;
          });
        });
      } else {
        var str = fieldName + " " + "desc";
        List sorts = [];
        sorts.add(str);
        this.report.id = widget.report.id;
        this.report.sorts = sorts;
        Provider.of<ReportModel>(context)
            .getReportData(report, this.limit, 0)
            .then((value) {
          setState(() {
            dataList = value;
            _isLoading = false;
            this.offset = 0;
          });
        });
      }
    }
  }

  List<MyDataColumn> getReportColumn(
      ReportModel reportModel, List<Field> colList) {
    return colList.map((p) {
      var r = MyDataColumn(
        label: Text(
          p.displayName,
          style: TextStyle(
              fontSize: 16, color: Colors.black, fontWeight: FontWeight.bold),
        ),
        onSort: (columnIndex, ascending) {
          setState(() {
            sort = !sort;
            sortColumnIndex = columnIndex;
          });
          onSortColumn(reportModel, columnIndex, ascending, p.name);
        },
        numeric:
            p.dataType == 'integer' || p.dataType == 'float' ? true : false,
      );
      return r;
    }).toList()
      ..insert(0, MyDataColumn(label: Text("Sr")));
  }

  List<MyDataRow> getReportRow(List rowList) {
    int index = 0;
    return rowList.map((p) {
      var r = MyDataRow(cells: getDataCell(p, this.cellfields, ++index));
      return r;
    }).toList();
  }

  Future<String> _findLocalPath() async {
    var platform = Theme.of(context).platform;
    final directory = platform == TargetPlatform.android
        ? await getExternalStorageDirectory()
        : await getApplicationDocumentsDirectory();
    return directory.path;
  }

  _download() async {
    await _prepare();

    var reportModel = Provider.of<ReportModel>(context, listen: false);
    String payload = await reportModel.getEscapeJson(report);

    print("downloader Path:$_localPath");
    String id = await FlutterDownloader.enqueue(
        url: "http://petrok.mokkon.com:8082/api/report-pdf/${report.object}",
        headers: {"payload": payload},
        savedDir: _localPath,
        showNotification: true,
        openFileFromNotification: true);
  }
}

List<MyDataCell> getDataCell(data, List fields, int index) {
  return fields.map((field) {
    var cell = MyDataCell(Text(
      '${data[field] == null ? "" : data[field]}',
    ));
    return cell;
  }).toList()
    ..insert(0, MyDataCell(Text("$index")));
}