import 'package:flutter/material.dart';
import 'package:local_spend/common/platform/platform_scaffold.dart';
import 'package:intl/intl.dart';
import 'dart:core';
import 'package:flutter/cupertino.dart';
import 'package:local_spend/common/widgets/animatedGradientButton.dart';
import 'package:local_spend/common/apifunctions/find_organisations.dart';
import 'package:local_spend/common/widgets/organisations_dialog.dart';
import 'package:local_spend/common/apifunctions/submit_receipt_api.dart';
import 'package:local_spend/common/apifunctions/categories.dart';

class Transaction {
  DateTime date;
  TextEditingController amount;
  Organisation organisation;
  String recurring;
  bool isEssential;
  String category;

  Transaction(
    this.date,
    this.amount,
    this.organisation,
    this.recurring,
    this.isEssential,
    this.category,
  );
}

class ReceiptPage2 extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new ReceiptPage2State();
  }
}

class ReceiptPage2State extends State<ReceiptPage2> {
  Transaction transaction = new Transaction(
    DateTime.now(),
    new TextEditingController(),
    new Organisation(null, null, null, null, null),
    "None",
    false,
    "Uncategorised",
  );

  _invalidDialog(context) {
    return AlertDialog(
      title: new Text("Invalid data"),
      content: new Text(
          "We couldn't process your request because some of the data entered is invalid."),
      actions: <Widget>[
        new FlatButton(
          child: new Text("OK"),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ],
    );
  }

  Future<List<String>> getCats() async {
    return await getCategories();
  }

  _submitReceipt(Transaction transaction) {
    DateTime dt = new DateTime.now();
    // sample transaction:
    // {
    //  "transaction_type":1,
    //  "transaction_value":33,
    //  "purchase_time":"2019-08-12T11:06:00.000+01:00",
    //  "organisation_id":59661,
    //  "essential":false,
    //  "session_key":"C438440A-B775-11E9-8EE8-147589E69626"
    // }

    Receipt receipt = new Receipt();
    receipt.organisationName = transaction.organisation.name;
    receipt.street = transaction.organisation.streetName;
    receipt.postcode = transaction.organisation.postcode;
    receipt.town = transaction.organisation.town;

    receipt.recurring = transaction.recurring;

    if (transaction.recurring == "None") {
      receipt.recurring = "";
    }

    receipt.category = transaction.category;

    if (transaction.category == "Uncategorised") {
      receipt.category = "";
    }

    receipt.amount = transaction.amount.text.toString();
    receipt.time = DateFormat("yyyy-MM-dd'T'hh:mm':00.000+01:00'").format(transaction.date).toString();
    receipt.essential = transaction.isEssential.toString();

    submitReceiptAPI(context, receipt);
  }

  List<String> _sampleRecurringOptions = new List<String>(7);
  List<String> _categories = new List<String>();

  @override
  Widget build(BuildContext context) {

    if (_categories.length == 0) {
      Future<List<String>> _futureCats = getCats();
      _categories.add("Fetching categories...");
      _futureCats.then((value) {
        _categories = null;
        _categories = value;
        setState(() {});
      });
    }
    
    _sampleRecurringOptions[0] = "None";
    _sampleRecurringOptions[1] = "Daily";
    _sampleRecurringOptions[2] = "Weekly";
    _sampleRecurringOptions[3] = "Fortnightly";
    _sampleRecurringOptions[4] = "Monthly";
    _sampleRecurringOptions[5] = "Quarterly";
    _sampleRecurringOptions[6] = "Yearly"; // these will be difficult to fetch from server as they are coded into the site's rather than fetched


    return PlatformScaffold(
      appBar: AppBar(
        backgroundColor: Colors.blue[400],
        title: Text(
          "Submit Receipt",
          style: TextStyle(
            fontSize: 20,
            color: Colors.white,
          ),
        ),
        centerTitle: true,
        iconTheme: IconThemeData(color: Colors.black),
      ),

      body: ListView(
        children: <Widget>[
          // each CHILD has its own horizontal padding because if the listView has padding, Android's end-of-scroll animation
          // doesn't fit the screen properly and looks weird

          Container(
            padding: const EdgeInsets.fromLTRB(15, 17, 0, 0),
            child : Text(
              "Receipt Details",
              style: TextStyle(
                fontSize: 26,
                color: Colors.grey[700],
                fontWeight: FontWeight.bold,
              ),
            ),
          ), // "Receipt Details" title

          Container(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Tooltip(
              message: "Date and time of transaction",
              child: Row(
                children: <Widget> [
                  Container(
                    child : Text(
                      "Date/Time",
                      style: TextStyle(
                        fontSize: 22,
                        color: Colors.black,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    width: MediaQuery.of(context).size.width * 0.3,
                  ),

                  Container(
                    padding: const EdgeInsets.fromLTRB(0, 0, 0, 0),
                    height: 40.0,
                    width: MediaQuery.of(context).size.width * 0.6,
                    child: RaisedButton(
                      onPressed: () {
                        showModalBottomSheet(
                            context: context,
                            builder: (BuildContext builder) {
                              return Container(
                                height: MediaQuery.of(context).copyWith().size.height / 3,
                                child: CupertinoDatePicker(
                                  initialDateTime: transaction.date.isAfter(DateTime.now())
                                    ? DateTime.now()
                                    : transaction.date,
                                  onDateTimeChanged: (DateTime newDate) {
                                    setState(() => {
                                      newDate.isAfter(DateTime.now())
                                          ? transaction.date = DateTime.now()
                                          : transaction.date = newDate,
                                    });
                                  },
                                  use24hFormat: true,
                                  maximumDate: DateTime.now(),
                                ),
                              );
                            });
                      },
                      child: Text(
                        transaction.date == null
                            ? 'None set'
                            : transaction.date.year == DateTime.now().year
                              ? '${new DateFormat.MMMd().format(transaction.date)}' + ", " + '${new DateFormat.Hm().format(transaction.date)}'
                              : '${new DateFormat.MMMd().format(transaction.date)}' + " " + transaction.date.year.toString() + ", " + '${new DateFormat.Hm().format(transaction.date)}',
                        style:
                        TextStyle(color: Colors.white, fontSize: 22.0),
                      ),
                      color: Colors.blue,
                    ),
                  ),
                ],
              ),
            ),
          ), // Date/Time picker

          Container(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Tooltip(
              message: "Transaction payee",
              child: Row(
                children: <Widget> [
                  Container(
                    child : Text(
                      "Payee",
                      style: TextStyle(
                        fontSize: 22,
                        color: Colors.black,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    width: MediaQuery.of(context).size.width * 0.3,
                  ),

                  Container(
                    padding: const EdgeInsets.fromLTRB(0, 0, 0, 0),
                    height: 40.0,
                    width: MediaQuery.of(context).size.width * 0.6,
                    child: RaisedButton(
                      onPressed: () {
                        var organisations = new FindOrganisations();
                        var orgDialog = organisations.dialog(context);
                        orgDialog.then((organisation) {
                          try {
                            organisation.name.length;
                            transaction.organisation = organisation;
  //                          debugPrint(organisation.name);
                            setState(() {});
                          } catch(_) {
                            debugPrint("No organisation chosen.");
                          }
                        });
                      },
                      child: Text(
                        transaction.organisation.name == null
                            ? 'Find'
                            : transaction.organisation.name.length > 14
                              ? transaction.organisation.name.substring(0,12) + "..."
                              : transaction.organisation.name,
                        style:
                        TextStyle(color: Colors.white, fontSize: 22.0),
                      ),
                      color: Colors.blue,
                    ),
                  ),
                ],
              ),
            ),
          ), // Organisation picker

          Container(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Tooltip(
              message: "Transaction recrudescence",
              child: Row(
                children: <Widget> [
                  Container(
                    child : Text(
                      "Recurring",
                      style: TextStyle(
                        fontSize: 22,
                        color: Colors.black,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    width: MediaQuery.of(context).size.width * 0.3,
                  ),

                  Container(
                    padding: const EdgeInsets.fromLTRB(0, 0, 0, 0),
                    height: 40.0,
                    width: MediaQuery.of(context).size.width * 0.6,
                    child: RaisedButton(
                      onPressed: () {
                        showModalBottomSheet(
                            context: context,
                            builder: (BuildContext builder) {
                              return Container(
                                height: MediaQuery.of(context).copyWith().size.height / 3,
                                child: CupertinoPicker(
                                  backgroundColor: Colors.white,
                                  children: _sampleRecurringOptions.map((thisOption) => Text(thisOption)).toList(),
                                  onSelectedItemChanged: ((newValue) {
                                    transaction.recurring = _sampleRecurringOptions[newValue];
                                    setState(() {});
                                  }),
                                  itemExtent: 40,
                                ),
                              );
                            });
                      },
                      child: Text(
                        transaction.recurring == null
                            ? 'None'
                            : transaction.recurring,
                        style:
                        TextStyle(color: Colors.white, fontSize: 22.0),
                      ),
                      color: Colors.blue,
                    ),
                  ),
                ],
              ),
            ),
          ), // Recurring picker

          Container(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Row(
              children: <Widget> [
                Container(
                  child : Text(
                    "Category",
                    style: TextStyle(
                      fontSize: 22,
                      color: Colors.black,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  width: MediaQuery.of(context).size.width * 0.3,
                ),

                Container(
                  padding: const EdgeInsets.fromLTRB(0, 0, 0, 0),
                  height: 40.0,
                  width: MediaQuery.of(context).size.width * 0.6,
                  child: Tooltip(
                    message: "Category of transaction",
                    child: RaisedButton(
                      onPressed: () {
                        showModalBottomSheet(
                            context: context,
                            builder: (BuildContext builder) {
                              return Container(
                                height: MediaQuery.of(context).copyWith().size.height / 3,
                                child: CupertinoPicker(
                                  backgroundColor: Colors.white,
                                  children: _categories.map((thisOption) => Text(thisOption)).toList(),
                                  onSelectedItemChanged: ((newValue) {
                                    transaction.category = _categories[newValue];
                                    setState(() {});
                                  }),
                                  itemExtent: 40,
                                ),
                              );
                            });
                      },
                      child: Text(
                        transaction.category == null
                            ? 'None'
                            : transaction.category,
                        style:
                        TextStyle(color: Colors.white, fontSize: 22.0),
                      ),
                      color: Colors.blue,
                    ),
                  ),
                ),
              ],
            ),
          ), // Category picker

          Container(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Tooltip(
              message: "Essential or not",
              child: Row(
                children: <Widget> [
                  Container(
                    child : Text(
                      "Essential",
                      style: TextStyle(
                        fontSize: 22,
                        color: Colors.black,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    width: MediaQuery.of(context).size.width * 0.3,
                  ),

                  Container(
                    height: 40.0,
                    width: MediaQuery.of(context).size.width * 0.6,
                    child: Checkbox(
                      value: transaction.isEssential,
                      onChanged: ((value) {
                        setState(() => transaction.isEssential = value);
                      }),
                    ),
                  ),
                ],
              ),
            ),
          ), // Essential

          Container(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Tooltip(
              message: "Transaction amount",
              child: Row(
                children: <Widget> [
                  Container(
                    child : Text(
                      "Amount",
                      style: TextStyle(
                        fontSize: 22,
                        color: Colors.black,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    width: MediaQuery.of(context).size.width * 0.3,
                  ),


                  Container(
                    padding: const EdgeInsets.fromLTRB(0, 0, 0, 0),
                    height: 40.0,
                    width: MediaQuery.of(context).size.width * 0.6,
                    child: TextField(
                      controller: transaction.amount,
                      decoration: InputDecoration(
                          hintText: "0.00"
                      ),
                      keyboardType: TextInputType.numberWithOptions(decimal: true, signed: true),
                    ),
                  ),
                ],
              ),
            ),
          ), // Amount picker

          Padding(
            padding: EdgeInsets.fromLTRB(MediaQuery.of(context).size.width * 0.05,15,MediaQuery.of(context).size.width * 0.05,0.0),
            child: Tooltip(
              message: "Submit receipt",
              child: Container(
                height: 75.0,
                child: ClipRRect(
                  borderRadius: BorderRadius.circular(2),
                  child: Stack(
                    children: [
                      AnimatedBackground(),
                      Material(
                        type: MaterialType.transparency,
                        child: InkWell(
                          child: Center(
                            child : Text("GO",
                              style:
                              TextStyle(color: Colors.white, fontSize: 30.0),
                            ),
                          ),
                          onTap: () {
                            try {
                              if (transaction.amount.text == "" || transaction.organisation.name == null) {
                                showDialog(
                                    context: context,
                                    builder: (BuildContext context) {
                                      return _invalidDialog(context);
                                    }
                                );
                              } else {
                                if (double.tryParse(transaction.amount.text) != null && double.tryParse(transaction.amount.text) > 0) {
                                  _submitReceipt(transaction);
                                } else {
                                  showDialog(
                                    context: context,
                                    builder: (BuildContext context) {
                                      return _invalidDialog(context);
                                    }
                                  );
                                }
                              }
                            }
                            catch (_) {
                              showDialog(
                                context: context,
                                builder: (BuildContext context) {
                                  return _invalidDialog(context);
                                }
                              );
                            }
                          },
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}