feat: add reminder email drafts

src/ccma/ui/claim_tab.py

@@ -5,7 +5,7 @@ from collections.abc import Callable
 from datetime import date
 from decimal import Decimal
 from pathlib import Path
-from tkinter import messagebox, ttk
+from tkinter import filedialog, messagebox, ttk
 
 from ccma.domain.contributions import (
     CLAIM_STATUS_LABELS,
@@ -21,6 +21,7 @@ from ccma.domain.contributions import (
     payment_allocated_total,
 )
 from ccma.domain.dates import date_input_hint, format_date_for_display
+from ccma.services.reminder_mail import generate_and_send_reminder_mail
 from ccma.storage.repository import MemberRepository, RepositoryError
 from ccma.ui.document_dialog import DocumentTemplateDialog
 from ccma.ui.labels import (
@@ -156,6 +157,13 @@ class ClaimTab(ttk.Frame):
             buttons, text="Als versandt markieren", command=self._send_reminder, state="disabled"
         )
         self.send_reminder_button.pack(side="right", padx=(8, 0))
+        self.email_reminder_button = ttk.Button(
+            buttons,
+            text="E-Mail erzeugen & versandt",
+            command=self._email_reminder,
+            state="disabled",
+        )
+        self.email_reminder_button.pack(side="right", padx=(8, 0))
         ttk.Button(buttons, text="Mahnung vorbereiten", command=self._add_reminder).pack(side="right")
         ttk.Button(buttons, text="Dokument erzeugen", command=self._create_document).pack(
             side="right", padx=(0, 8)
@@ -425,8 +433,22 @@ class ClaimTab(ttk.Frame):
         editable = bool(reminder and str(reminder.get("status", "draft")) in {"draft", "generated"})
         state = "normal" if editable else "disabled"
         self.send_reminder_button.configure(state=state)
+        self.email_reminder_button.configure(state=state)
         self.discard_reminder_button.configure(state=state)
 
+    def _email_reminder(self) -> None:
+        reminder = self._selected_reminder()
+        if reminder:
+            ReminderMailDialog(
+                self,
+                self.repository,
+                self.member_id,
+                self.claim_id,
+                str(reminder["reminder_id"]),
+                str(reminder.get("name", "Mahnung")),
+                self._changed,
+            )
+
     def _send_reminder(self) -> None:
         reminder = self._selected_reminder()
         if not reminder or not messagebox.askyesno(
@@ -893,6 +915,97 @@ class ReminderDialog(_Dialog):
         self.on_saved()
 
 
+class ReminderMailDialog(tk.Toplevel):
+    def __init__(
+        self,
+        master,
+        repository,
+        member_id,
+        claim_id,
+        reminder_id,
+        reminder_name,
+        on_saved,
+    ):
+        super().__init__(master)
+        self.repository = repository
+        self.member_id = member_id
+        self.claim_id = claim_id
+        self.reminder_id = reminder_id
+        self.reminder_name = reminder_name
+        self.on_saved = on_saved
+        organization = repository.get_configuration().get("organization") or {}
+        self.sender_name_var = tk.StringVar(
+            value=str(organization.get("name") or "Verwaltung C3MA")
+        )
+        self.sender_email_var = tk.StringVar(value=str(organization.get("email") or ""))
+        self.title("Mahnung als E-Mail erzeugen")
+        self.transient(master)
+        self.resizable(True, False)
+        self.columnconfigure(1, weight=1)
+        ttk.Label(
+            self,
+            text=(
+                "Die erzeugte E-Mail wird in der Mitgliederakte archiviert und die Mahnung "
+                "sofort als versandt gebucht. Zahlungsfrist und Mahngebühr werden dabei wirksam."
+            ),
+            wraplength=620,
+        ).grid(row=0, column=0, columnspan=2, sticky="w", padx=14, pady=(14, 10))
+        ttk.Label(self, text="Absendername").grid(row=1, column=0, sticky="w", padx=14, pady=5)
+        ttk.Entry(self, textvariable=self.sender_name_var, width=55).grid(
+            row=1, column=1, sticky="ew", padx=(0, 14), pady=5
+        )
+        ttk.Label(self, text="Absenderadresse").grid(row=2, column=0, sticky="w", padx=14, pady=5)
+        ttk.Entry(self, textvariable=self.sender_email_var, width=55).grid(
+            row=2, column=1, sticky="ew", padx=(0, 14), pady=5
+        )
+        ttk.Label(self, text="Signatur").grid(row=3, column=0, sticky="nw", padx=14, pady=5)
+        self.signature = tk.Text(self, width=55, height=5, wrap="word")
+        self.signature.grid(row=3, column=1, sticky="ew", padx=(0, 14), pady=5)
+        self.signature.insert("1.0", "Der Vorstand\nChaos Computer Club Mannheim e.V.")
+        buttons = ttk.Frame(self, padding=14)
+        buttons.grid(row=4, column=0, columnspan=2, sticky="e")
+        ttk.Button(buttons, text="Abbrechen", command=self.destroy).pack(side="left")
+        ttk.Button(
+            buttons,
+            text="EML speichern und als versandt buchen",
+            style="Accent.TButton",
+            command=self._generate,
+        ).pack(side="left", padx=(8, 0))
+        self.grab_set()
+
+    def _generate(self) -> None:
+        selected = filedialog.asksaveasfilename(
+            parent=self,
+            title="Mahnung als Thunderbird-Entwurf speichern",
+            defaultextension=".eml",
+            initialfile=f"{self.reminder_name}.eml",
+            filetypes=[("E-Mail-Datei", "*.eml"), ("Alle Dateien", "*.*")],
+        )
+        if not selected:
+            return
+        try:
+            result = generate_and_send_reminder_mail(
+                self.repository,
+                self.member_id,
+                self.claim_id,
+                self.reminder_id,
+                output_path=selected,
+                sender_name=self.sender_name_var.get(),
+                sender_email=self.sender_email_var.get(),
+                signature=self.signature.get("1.0", "end-1c"),
+            )
+        except (OSError, RepositoryError) as exc:
+            messagebox.showerror("Mahnung konnte nicht erzeugt werden", str(exc), parent=self)
+            return
+        messagebox.showinfo(
+            "Mahnung erzeugt",
+            f"Die E-Mail wurde gespeichert und als versandt gebucht:\n{result.export_path}",
+            parent=self,
+        )
+        self.destroy()
+        self.on_saved()
+
+
 class DunningHoldDialog(_Dialog):
     def __init__(self, master, repository, member_id, claim_id, on_saved):
         super().__init__(master, "Mahnsperre setzen", on_saved)