Add guild bank.

drakul/bank/admin.py

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+from django.contrib import admin
+
+from .models import Item, ItemTransaction, MoneyTransaction
+
+
+@admin.register(Item)
+class DatabaseItemAdmin(admin.ModelAdmin):
+    list_display = ["id", "name", "icon", "quality", "klass", "sub_klass"]
+    list_display_links = ["id", "name"]
+    search_fields = ["id", "name", "icon", "quality", "klass", "sub_klass"]
+
+
+@admin.register(ItemTransaction)
+class ItemTransactionAdmin(admin.ModelAdmin):
+    list_display = ["date", "item", "quantity", "balance"]
+    list_display_links = ["item"]
+    search_fields = ["date", "item__name"]
+
+
+@admin.register(MoneyTransaction)
+class MoneyTransactionAdmin(admin.ModelAdmin):
+    list_display = ["date", "amount", "balance"]
+    search_fields = ["date"]

drakul/bank/apps.py

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+from django.apps import AppConfig
+
+
+class BankConfig(AppConfig):
+    name = "drakul.bank"

drakul/bank/forms.py

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+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Submit, Layout, Field
+from django import forms
+
+
+class BankImportForm(forms.Form):
+    import_string = forms.CharField(widget=forms.Textarea)
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+        self.helper.layout = Layout(
+            Field("import_string"),
+            Submit("submit", "Import", css_class="btn btn-block btn-primary")
+        )

drakul/bank/migrations/0001_initial.py

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+# Generated by Django 3.0.2 on 2020-01-12 04:34
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Item',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255)),
+                ('icon', models.CharField(max_length=50)),
+                ('quality', models.PositiveSmallIntegerField(choices=[(0, 'Poor'), (1, 'Common'), (2, 'Uncommon'), (3, 'Rare'), (4, 'Epic'), (5, 'Legendary'), (6, 'Artifact')])),
+                ('klass', models.PositiveSmallIntegerField(choices=[(0, 'Consumables'), (1, 'Containers'), (2, 'Weapons'), (4, 'Armor'), (6, 'Projectiles'), (7, 'Trade Goods'), (9, 'Recipes'), (11, 'Quiver'), (12, 'Quest Items'), (15, 'Miscellaneous')])),
+                ('sub_klass', models.SmallIntegerField()),
+            ],
+            options={
+                'ordering': ['id'],
+            },
+        ),
+        migrations.CreateModel(
+            name='MoneyTransaction',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('date', models.DateTimeField(auto_now=True)),
+                ('amount', models.IntegerField()),
+                ('balance', models.PositiveIntegerField()),
+            ],
+            options={
+                'ordering': ['-date'],
+            },
+        ),
+        migrations.CreateModel(
+            name='ItemTransaction',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('date', models.DateTimeField(auto_now=True)),
+                ('quantity', models.SmallIntegerField()),
+                ('balance', models.PositiveSmallIntegerField()),
+                ('item', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='transactions', to='bank.Item')),
+            ],
+            options={
+                'ordering': ['-date', 'item'],
+            },
+        ),
+    ]

drakul/bank/migrations/0002_add_genesis_money_transaction.py

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+# Generated by Django 3.0.2 on 2020-01-11 04:19
+
+from django.db import migrations
+
+
+def add_genesis_money_transaction(apps, schema_editor):
+    """
+    https://docs.djangoproject.com/en/3.0/topics/migrations/#data-migrations
+    """
+    MoneyTransaction = apps.get_model("bank", "MoneyTransaction")
+    MoneyTransaction.objects.create(amount=0, balance=0)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bank', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(add_genesis_money_transaction),
+    ]

drakul/bank/models.py

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+import operator
+from functools import reduce
+
+from django.db import models
+from django.db.models import Max, Q
+
+
+class Item(models.Model):
+    name = models.CharField(
+        max_length=255
+    )
+    icon = models.CharField(
+        max_length=50
+    )
+
+    QUALITY_POOR = 0
+    QUALITY_COMMON = 1
+    QUALITY_UNCOMMON = 2
+    QUALITY_RARE = 3
+    QUALITY_EPIC = 4
+    QUALITY_LEGENDARY = 5
+    QUALITY_ARTIFACT = 6
+    QUALITY_CHOICES = [
+        (QUALITY_POOR, "Poor"),
+        (QUALITY_COMMON, "Common"),
+        (QUALITY_UNCOMMON, "Uncommon"),
+        (QUALITY_RARE, "Rare"),
+        (QUALITY_EPIC, "Epic"),
+        (QUALITY_LEGENDARY, "Legendary"),
+        (QUALITY_ARTIFACT, "Artifact"),
+    ]
+    quality = models.PositiveSmallIntegerField(
+        choices=QUALITY_CHOICES
+    )
+
+    KLASS_CONSUMABLES = 0
+    KLASS_CONTAINERS = 1
+    KLASS_WEAPONS = 2
+    KLASS_ARMOR = 4
+    KLASS_PROJECTILES = 6
+    KLASS_TRADE_GOODS = 7
+    KLASS_RECIPES = 9
+    KLASS_QUIVER = 11
+    KLASS_QUEST_ITEMS = 12
+    KLASS_MISCELLANEOUS = 15
+    KLASS_CHOICES = [
+        (KLASS_CONSUMABLES, "Consumables"),
+        (KLASS_CONTAINERS, "Containers"),
+        (KLASS_WEAPONS, "Weapons"),
+        (KLASS_ARMOR, "Armor"),
+        (KLASS_PROJECTILES, "Projectiles"),
+        (KLASS_TRADE_GOODS, "Trade Goods"),
+        (KLASS_RECIPES, "Recipes"),
+        (KLASS_QUIVER, "Quiver"),
+        (KLASS_QUEST_ITEMS, "Quest Items"),
+        (KLASS_MISCELLANEOUS, "Miscellaneous"),
+    ]
+    klass = models.PositiveSmallIntegerField(
+        choices=KLASS_CHOICES
+    )
+
+    sub_klass = models.SmallIntegerField(
+        # TODO: Should be choices field with proper names like 'klass'.
+        #  Saving all (without using it) for now, so we have the option of migrating in the future.
+        #  NOTE: Sub-classes can be negative!
+    )
+
+    class Meta:
+        ordering = ["id"]
+
+    def __str__(self):
+        return self.name
+
+
+class ItemTransactionQuerySet(models.QuerySet):
+    def current_items(self):
+        # TODO: If we were using postgres we could use 'ItemTransaction.objects.order_by("-date").distinct("item")'
+        if not self.exists():
+            return self.none()
+        return self.filter(
+            reduce(
+                operator.or_,
+                (Q(**item) & ~Q(balance=0)
+                 for item in self.values("item").annotate(date=Max("date")))
+            )
+        )
+
+
+class ItemTransaction(models.Model):
+    objects = ItemTransactionQuerySet.as_manager()
+
+    date = models.DateTimeField(auto_now=True)
+    item = models.ForeignKey(
+        Item,
+        related_name="transactions",
+        on_delete=models.PROTECT
+    )
+    quantity = models.SmallIntegerField()
+    balance = models.PositiveSmallIntegerField()
+
+    class Meta:
+        ordering = ["-date", "item"]
+
+    def __str__(self) -> str:
+        return f"{self.date}: {self.quantity}x {self.item}"
+
+
+class MoneyTransactionQuerySet(models.QuerySet):
+    def current_money(self):
+        return self.latest("date")
+
+
+class MoneyTransaction(models.Model):
+    objects = MoneyTransactionQuerySet.as_manager()
+
+    date = models.DateTimeField(auto_now=True)
+    amount = models.IntegerField()
+    balance = models.PositiveIntegerField()
+
+    class Meta:
+        ordering = ["-date"]
+
+    def __str__(self) -> str:
+        return f"{self.date}: {self.amount}"