import mail from '@adonisjs/mail/services/main'
import env from '#start/env'
import { renderTemplate, formatAmountFr, formatDateFr } from '#services/template'
import type Invoice from '#models/invoice'
import type Client from '#models/client'
import type PlanStep from '#models/plan_step'
import type User from '#models/user'

type RelancePayload = {
  invoice: Invoice
  client: Client
  step: PlanStep
  user: User | null
}

/**
 * Envoie un email de relance à un client à partir d'un step.
 * Le subject/body du step contiennent des placeholders Mustache-like
 * (`{{client.name}}`, `{{numero}}`, `{{amount}}`, `{{dueDate}}`,
 * `{{signature}}`) qu'on interpole avant l'envoi.
 *
 * Le mailer effectif est piloté par MAIL_DRIVER (`smtp` Mailpit en dev,
 * `resend` en prod).
 */
export async function sendRelanceEmail({ invoice, client, step, user }: RelancePayload) {
  const vars = {
    client: { name: client.name, email: client.email },
    numero: invoice.numero,
    amount: formatAmountFr(invoice.amountTtcCents),
    dueDate: formatDateFr(invoice.dueDate.toJSDate()),
    issueDate: formatDateFr(invoice.issueDate.toJSDate()),
    signature: user?.signature ?? user?.fullName ?? '',
  }

  const subject = renderTemplate(step.subject, vars)
  const body = renderTemplate(step.body, vars)

  const mailer = mail.use(env.get('MAIL_DRIVER', 'smtp'))
  await mailer.send((m) => {
    m.from(env.get('MAIL_FROM_ADDRESS', 'relances@rubis-sur-l-ongle.fr'), env.get('MAIL_FROM_NAME', "Rubis Sur l'Ongle"))
      .to(client.email, client.name)
      .subject(subject)
      // Texte brut pour V1 — on ajoutera un template HTML quand on aura
      // décidé d'un look graphique pour les relances.
      .text(body)
  })
}