/// A template for one kind of mail the workshop sends, saved under a name.
///
/// The same idea as DocumentDesign: a workshop keeps several templates for a
/// kind, and the one that sends is named by the AppSetting
/// `email.template.<kind>` as `design:<id>`, the way `invoice.activeDesign`
/// names the sheet. No setting means the built-in preset. Blocks and a theme
/// rather than a body of HTML, because the renderer turns them into markup a
/// mail client will honour and a workshop should never have to think about
/// tables and inline styles.
///
/// Nothing is snapshotted. An issued invoice has to reprint identically for
/// years, which is why its design is frozen; a sent email is already in
/// somebody's inbox and is never rendered again.
model EmailTemplate {
  id             String       @id @default(cuid())
  organizationId String
  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
  /// One of EMAIL_KINDS in src/features/email/Lib/emailKinds.ts.
  kind           String
  name           String
  /// The subject line, tags and all.
  subject        String
  /// EmailBlock[] as edited.
  blocks         Json
  /// EmailTheme: colours, typeface, button shape, logo on or off.
  theme          Json
  createdAt      DateTime     @default(now())
  updatedAt      DateTime     @updatedAt

  @@index([organizationId, kind])
  @@map("email_templates")
}