from django.contrib import admin
 from django import forms
 from django.utils import simplejson
+from django.utils.safestring import mark_safe
 from django.core.urlresolvers import reverse
 
-from .models import Submission, Assignment
+from .models import Submission, Assignment, Attachment
 from .middleware import get_current_request
 
 
 
 readonly_fields = ('submitted_by', 'first_name', 'last_name', 'email', 'key', 'key_sent')
 
+class AttachmentWidget(forms.Widget):
+    def render(self, name, value, *args, **kwargs):
+        return mark_safe('<a href="%s">%s</a>' % (value, value))
 
 class SubmissionFormBase(forms.ModelForm):
     class Meta:
         for exercise in exercises:
             if exercise not in user_exercises:
                 continue
-            if exercise['type'] == 'open' or exercise.get('open_part', None):
-                answer_field_name = 'exercise_%s' % exercise['id']
-                mark_field_name = 'markof_%s_by_%s' % (exercise['id'], request.user.id)
+            
+            answer_field_name = 'exercise_%s' % exercise['id']
+            mark_field_name = 'markof_%s_by_%s' % (exercise['id'], request.user.id)
+            if exercise['type'] in ('open', 'file_upload') or exercise.get('open_part', None):
+                if exercise['type'] == 'file_upload':
+                    try:
+                        attachment = Attachment.objects.get(submission = submission, exercise_id = exercise['id'])
+                    except Attachment.DoesNotExist:
+                        attachment = None
+                    widget = AttachmentWidget
+                    initial = attachment.file.url if attachment else None
+                else:
+                    widget = forms.Textarea(attrs={'readonly':True})
+                    initial = get_open_answer(answers, exercise)
+
                 fields[answer_field_name] = forms.CharField(
-                    widget = forms.Textarea(attrs={'readonly':True}),
-                    initial = get_open_answer(answers, exercise),
-                    label = 'Rozwiązanie zadania %s' % exercise['id']
+                        widget = widget,
+                        initial = initial,
+                        label = 'Rozwiązanie zadania %s' % exercise['id']
                 )
 
                 fields[mark_field_name] = forms.ChoiceField(
 
--- /dev/null
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Deleting field 'Attachment.name'
+        db.delete_column(u'wtem_attachment', 'name')
+
+        # Adding field 'Attachment.exercise_id'
+        db.add_column(u'wtem_attachment', 'exercise_id',
+                      self.gf('django.db.models.fields.IntegerField')(default=None),
+                      keep_default=False)
+
+
+    def backwards(self, orm):
+
+        # User chose to not deal with backwards NULL issues for 'Attachment.name'
+        raise RuntimeError("Cannot reverse this migration. 'Attachment.name' and its values cannot be restored.")
+        # Deleting field 'Attachment.exercise_id'
+        db.delete_column(u'wtem_attachment', 'exercise_id')
+
+
+    models = {
+        u'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '80'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': u"orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'})
+        },
+        u'auth.permission': {
+            'Meta': {'ordering': "(u'content_type__app_label', u'content_type__model', u'codename')", 'unique_together': "((u'content_type', u'codename'),)", 'object_name': 'Permission'},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['contenttypes.ContentType']"}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        u'auth.user': {
+            'Meta': {'object_name': 'User'},
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '75', 'blank': 'True'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'to': u"orm['auth.Group']", 'symmetrical': 'False', 'blank': 'True'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': u"orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'}),
+            'username': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'})
+        },
+        u'contact.contact': {
+            'Meta': {'ordering': "('-created_at',)", 'object_name': 'Contact'},
+            'body': ('jsonfield.fields.JSONField', [], {'default': '{}'}),
+            'contact': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'created_at': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'form_tag': ('django.db.models.fields.CharField', [], {'max_length': '32', 'db_index': 'True'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'ip': ('django.db.models.fields.IPAddressField', [], {'max_length': '15'})
+        },
+        u'contenttypes.contenttype': {
+            'Meta': {'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)", 'object_name': 'ContentType', 'db_table': "'django_content_type'"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        u'wtem.assignment': {
+            'Meta': {'object_name': 'Assignment'},
+            'exercises': ('jsonfield.fields.JSONField', [], {'default': '{}'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['auth.User']", 'unique': 'True'})
+        },
+        u'wtem.attachment': {
+            'Meta': {'object_name': 'Attachment'},
+            'exercise_id': ('django.db.models.fields.IntegerField', [], {}),
+            'file': ('django.db.models.fields.files.FileField', [], {'max_length': '100'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'submission': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['wtem.Submission']"})
+        },
+        u'wtem.submission': {
+            'Meta': {'object_name': 'Submission'},
+            'answers': ('django.db.models.fields.CharField', [], {'max_length': '65536', 'null': 'True', 'blank': 'True'}),
+            'contact': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['contact.Contact']", 'null': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'unique': 'True', 'max_length': '100'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'key': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'}),
+            'key_sent': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'marks': ('jsonfield.fields.JSONField', [], {'default': '{}'})
+        }
+    }
+
+    complete_apps = ['wtem']
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