From c589bdc8926f9fb7d4b34a2c6569fa4feae833f0 Mon Sep 17 00:00:00 2001
From: Radek Czajka <rczajka@rczajka.pl>
Date: Wed, 28 Oct 2020 12:41:11 +0100
Subject: [PATCH] Estimated costs for collections.

---
 src/catalogue/admin.py  | 34 ++++++++++++++++++++++++++++++++++
 src/catalogue/models.py | 11 ++++-------
 2 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/src/catalogue/admin.py b/src/catalogue/admin.py
index 35345216..a8fc82a5 100644
--- a/src/catalogue/admin.py
+++ b/src/catalogue/admin.py
@@ -1,6 +1,7 @@
 # This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
+from collections import Counter
 from django.contrib import admin
 from django.utils.translation import gettext_lazy as _
 from fnpdjango.actions import export_as_csv_action
@@ -93,6 +94,15 @@ class BookAdmin(WikidataAdminMixin, admin.ModelAdmin):
             qs = qs.prefetch_related("authors", "translators")
         return qs
 
+    def estimated_costs(self, obj):
+        return "\n".join(
+            "{}: {} zł".format(
+                work_type.name,
+                cost or '—'
+            )
+            for work_type, cost in obj.get_estimated_costs().items()
+        )
+
 
 admin.site.register(models.Book, BookAdmin)
 
@@ -112,8 +122,32 @@ class CollectionAdmin(admin.ModelAdmin):
     autocomplete_fields = []
     prepopulated_fields = {"slug": ("name",)}
     search_fields = ["name"]
+    fields = ['name', 'slug', 'estimated_costs']
+    readonly_fields = ['estimated_costs']
     inlines = [AuthorInline, BookInline]
 
+    def estimated_costs(self, obj):
+        costs = Counter()
+        for book in obj.book_set.all():
+            for k, v in book.get_estimated_costs().items():
+                costs[k] += v or 0
+
+        for author in obj.author_set.all():
+            for book in author.book_set.all():
+                for k, v in book.get_estimated_costs().items():
+                    costs[k] += v or 0
+            for book in author.translated_book_set.all():
+                for k, v in book.get_estimated_costs().items():
+                    costs[k] += v or 0
+
+        return "\n".join(
+            "{}: {} zł".format(
+                work_type.name,
+                cost or '—'
+            )
+            for work_type, cost in costs.items()
+        )
+
 
 admin.site.register(models.Collection, CollectionAdmin)
 
diff --git a/src/catalogue/models.py b/src/catalogue/models.py
index bb738a26..ce7a5722 100644
--- a/src/catalogue/models.py
+++ b/src/catalogue/models.py
@@ -168,14 +168,11 @@ class Book(WikidataMixin, models.Model):
         DBook = apps.get_model("documents", "Book")
         return DBook.objects.filter(dc_slug=self.slug)
 
-    def estimated_costs(self):
-        return "\n".join(
-            "{}: {} zł".format(
-                work_type.name,
-                work_type.calculate(self) or '—'
-            )
+    def get_estimated_costs(self):
+        return {
+            work_type: work_type.calculate(self)
             for work_type in WorkType.objects.all()
-        )
+        }
 
 
 class Collection(models.Model):
-- 
2.20.1