prasule/lib/api/wallet.dart

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// SPDX-FileCopyrightText: (C) 2024 Matyáš Caras
//
// SPDX-License-Identifier: AGPL-3.0-only
import 'dart:math';
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import 'package:currency_picker/currency_picker.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
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import 'package:json_annotation/json_annotation.dart';
import 'package:prasule/api/category.dart';
import 'package:prasule/api/entry_data.dart';
import 'package:prasule/api/recurring_entry.dart';
import 'package:prasule/api/wallet_entry.dart';
import 'package:prasule/api/wallet_manager.dart';
import 'package:prasule/main.dart';
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part 'wallet.g.dart';
Currency _currencyFromJson(Map<String, dynamic> data) =>
Currency.from(json: data);
/// Represents a single wallet
///
/// A wallet stores [WalletSingleEntry]s categorized under [WalletCategory]s
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@JsonSerializable()
class Wallet {
/// A wallet stores [WalletSingleEntry]s categorized under [WalletCategory]s
Wallet({
required this.name,
required this.currency,
this.categories = const [],
this.entries = const [],
this.recurringEntries = const [],
this.starterBalance = 0,
});
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/// Connects the generated fromJson method
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factory Wallet.fromJson(Map<String, dynamic> json) => _$WalletFromJson(json);
/// A list of all [RecurringWalletEntry]s
final List<RecurringWalletEntry> recurringEntries;
/// Name of the wallet
final String name;
/// A list of available categories
final List<WalletCategory> categories;
/// List of saved entries
final List<WalletSingleEntry> entries;
/// The starting balance of the wallet
///
/// Used to calculate current balance
double starterBalance;
/// Selected currency
@JsonKey(fromJson: _currencyFromJson)
final Currency currency;
/// Connects the generated toJson method
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Map<String, dynamic> toJson() => _$WalletToJson(this);
/// Getter for the next unused unique number ID in the wallet's **entry** list
int get nextId {
var id = 1;
while (entries.where((element) => element.id == id).isNotEmpty) {
id++; // create unique ID
}
return id;
}
/// Getter for the next unused unique number ID in the wallet's **category**
/// list
int get nextCategoryId {
var id = 0;
while (categories.where((element) => element.id == id).isNotEmpty) {
id++; // create unique ID
}
return id;
}
/// Handles adding recurring entries to the entry list
void recurEntries() {
final n = DateTime.now();
for (final ent in recurringEntries) {
var m = DateTime(
(ent.recurType == RecurType.year)
? ent.lastRunDate.year + ent.repeatAfter
: ent.lastRunDate.year,
(ent.recurType == RecurType.month)
? ent.lastRunDate.month + ent.repeatAfter
: ent.lastRunDate.month,
(ent.recurType == RecurType.day)
? ent.lastRunDate.day + ent.repeatAfter
: ent.lastRunDate.day,
); // create the date after which we should recur
while (n.isAfter(
m,
)) {
logger
..i("Adding recurring entry ${ent.data.name}")
..d("Current entry count: ${entries.length}");
recurringEntries[recurringEntries.indexOf(ent)].lastRunDate =
m; // update date on recurring entry
final addedEntry = WalletSingleEntry(
data: recurringEntries[recurringEntries.indexOf(ent)].data,
type: recurringEntries[recurringEntries.indexOf(ent)].type,
date: m,
category: recurringEntries[recurringEntries.indexOf(ent)].category,
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id: nextId,
);
entries.add(addedEntry);
m = DateTime(
(ent.recurType == RecurType.year)
? recurringEntries[recurringEntries.indexOf(ent)]
.lastRunDate
.year +
ent.repeatAfter
: recurringEntries[recurringEntries.indexOf(ent)]
.lastRunDate
.year,
(ent.recurType == RecurType.month)
? recurringEntries[recurringEntries.indexOf(ent)]
.lastRunDate
.month +
ent.repeatAfter
: recurringEntries[recurringEntries.indexOf(ent)]
.lastRunDate
.month,
(ent.recurType == RecurType.day)
? recurringEntries[recurringEntries.indexOf(ent)]
.lastRunDate
.day +
ent.repeatAfter
: recurringEntries[recurringEntries.indexOf(ent)].lastRunDate.day,
); // add the variable again to check if we aren't missing any entries
logger.i(
"Last recurred date is now on ${DateFormat.yMMMMd().format(m)} (${n.isAfter(m)})",
);
}
WalletManager.saveWallet(this); // save wallet
}
}
/// Removes the specified category.
///
/// All [WalletSingleEntry]s will have their category reassigned
/// to the default *No category*
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void removeCategory(WalletCategory category) {
// First remove the category from existing entries
for (final entryToChange
in entries.where((element) => element.category.id == category.id)) {
entryToChange.category =
categories.where((element) => element.id == 0).first;
}
// Remove the category
categories.removeWhere((element) => element.id == category.id);
// Save
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WalletManager.saveWallet(this);
}
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/// Returns the current balance
///
/// Basically just takes *starterBalance* and adds all the entries to it
double get currentBalance {
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var toAdd = 0.0;
for (final e in entries) {
toAdd += (e.type == EntryType.income) ? e.data.amount : -e.data.amount;
}
return starterBalance + toAdd;
}
/// Returns the amount that was made/lost during a month
double calculateMonthStatus(int month, int year) {
var f = 0.0;
for (final e in entries.where(
(element) => element.date.year == year && element.date.month == month,
)) {
f += (e.type == EntryType.income) ? e.data.amount : -e.data.amount;
}
return f;
}
/// Empty wallet used for placeholders
static final Wallet empty = Wallet(
name: "Empty",
entries: [],
recurringEntries: [],
categories: [
WalletCategory(
name: "Default",
id: 0,
icon: IconData(
Icons.payments.codePoint,
fontFamily: 'MaterialIcons',
),
color: Colors.white,
),
],
currency: Currency.from(
json: {
"code": "USD",
"name": "United States Dollar",
"symbol": r"$",
"flag": "USD",
"decimal_digits": 2,
"number": 840,
"name_plural": "US dollars",
"thousands_separator": ",",
"decimal_separator": ".",
"space_between_amount_and_symbol": false,
"symbol_on_left": true,
},
),
);
/// Creates test data used for debugging purposes
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void createTestEntries() {
entries.clear();
recurringEntries.clear();
final random = Random();
for (var i = 0; i < 30; i++) {
entries.add(
WalletSingleEntry(
data: EntryData(
name: "Test Entry #${i + 1}",
amount: random.nextInt(20000).toDouble(),
),
type: (random.nextInt(3) > 0) ? EntryType.expense : EntryType.income,
date: DateTime(
2023,
random.nextInt(12) + 1,
random.nextInt(28) + 1,
),
category: categories[random.nextInt(categories.length)],
id: nextId,
),
);
}
logger.d(
"Created ${entries.length} regular entries",
);
for (var i = 0; i < 3; i++) {
final type = random.nextInt(3);
recurringEntries.add(
RecurringWalletEntry(
data: EntryData(
name: "Recurring Entry #${i + 1}",
amount: random.nextInt(20000).toDouble(),
),
type: (random.nextInt(3) > 0) ? EntryType.expense : EntryType.income,
date: DateTime(
2023,
random.nextInt(12) + 1,
random.nextInt(28) + 1,
),
category: categories[random.nextInt(categories.length)],
id: nextId,
lastRunDate: DateTime.now().subtract(
Duration(
days: (type > 0) ? 3 : 3 * 31,
),
),
recurType: (type > 0) ? RecurType.day : RecurType.month,
),
);
}
logger.d(
"Created ${recurringEntries.length} recurring entries",
);
// save and reload
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WalletManager.saveWallet(this);
}
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}