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export const sendReminder = pikkuFunc({
  title: 'Send a billing reminder',
  description: 'Sends an email reminder to a user based on urgency level',
  tags: ['billing', 'notifications'],
  input: z.object({ userId: z.string(), urgency: z.enum(['low', 'high']) }),
  output: z.object({ sent: z.boolean() }),
  permissions: { user: isAuthenticated },  // enforced on every surface
  mcp: true,                               // expose as MCP tool
  approvalRequired: true,                  // agent must ask before calling
  approvalDescription: async (_s, { userId }) =>  // shown to user for approval
    `Send billing reminder to user ${userId}`,
  func: async ({ db, email }, { userId, urgency }) => {
    const user = await db.users.find(userId)
    await email.send({ to: user.email, template: 'reminder', urgency })
    return { sent: true }
  },
})

wireHTTP({ method: 'post', route: '/send-reminder', func: sendReminder })
wireQueue({ queue: 'billing-reminders', func: sendReminder })
wireScheduler({ schedule: '0 9 * * *', func: sendReminder })
pikkuAIAgent({
  name: 'billing-assistant',
  instruction: 'You help users manage billing reminders and invoices.',
  tools: [sendReminder],
})