#93: reorganise Rerun, Diffusion, Schedule module (#95)

#93

Co-authored-by: bkfox <thomas bkfox net>
Reviewed-on: rc/aircox#95

aircox/admin/schedule.py

@@ -0,0 +1,55 @@
+from django.contrib import admin
+from django.forms import ModelForm
+from django.utils.translation import gettext_lazy as _
+
+from aircox.models import Schedule
+
+
+__all__ = ("ScheduleInlineForm", "ScheduleInline", "ScheduleAdmin")
+
+
+# In order to simplify schedule_post_save algorithm, an existing schedule can't
+# update the following fields: "frequency", "date"
+class ScheduleInlineForm(ModelForm):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if self.initial:
+            self.fields["date"].disabled = True
+            self.fields["frequency"].disabled = True
+
+
+class ScheduleInline(admin.TabularInline):
+    model = Schedule
+    form = ScheduleInlineForm
+    readonly_fields = ("timezone",)
+    extra = 1
+
+
+@admin.register(Schedule)
+class ScheduleAdmin(admin.ModelAdmin):
+    def program_title(self, obj):
+        return obj.program.title
+
+    program_title.short_description = _("Program")
+
+    def freq(self, obj):
+        return obj.get_frequency_display()
+
+    freq.short_description = _("Day")
+
+    list_filter = ["frequency", "program"]
+    list_display = [
+        "program_title",
+        "freq",
+        "time",
+        "timezone",
+        "duration",
+        "initial",
+    ]
+    list_editable = ["time", "duration", "initial"]
+
+    def get_readonly_fields(self, request, obj=None):
+        if obj:
+            return ["program", "date", "frequency"]
+        else:
+            return []