/**
 * invoice_pdf — génération de PDF pour les factures natives.
 *
 * Phase 2 : implémentation réelle via @react-pdf/renderer + upload MinIO.
 *
 * Pipeline :
 *   1. Construit les `InvoiceTemplateProps` depuis l'invoice + settings résolus
 *   2. Appelle `renderInvoiceToBuffer(themeSlug, props)` (dispatcher de thèmes)
 *   3. `generateInvoicePdf` upload sur MinIO et retourne la storageKey.
 *      `previewInvoicePdf` retourne le buffer brut pour stream HTTP.
 *
 * Note Factur-X (V1.5) : le buffer généré est un PDF/A-3 compatible. Pour
 * passer en Factur-X, il faudra injecter un XML CII en pièce jointe dans
 * le PDF (cf. roadmap dans CLAUDE.md / decisions.md ADR-022). Ce point
 * d'extension est laissé en post-traitement Buffer → Buffer.
 */

import type Invoice from '#models/invoice'
import type { ResolvedInvoiceSettings } from '#services/invoice_settings'
import { resolveBrandTokens } from '#services/brand'
import { renderInvoiceToBuffer } from '#pdf-templates/index'
import { uploadBuffer } from '#services/media_storage'
import type { InvoiceTemplateProps } from '#pdf-templates/common'
import type Organization from '#models/organization'

export interface InvoiceRenderContext {
  invoice: Invoice
  resolvedSettings: ResolvedInvoiceSettings
  /** Org de l'invoice — utilisée pour le logo (brand_settings.logoUrl). */
  organization: Organization
}

export interface GeneratedPdf {
  /** Clé MinIO sous laquelle le PDF est stocké. */
  storageKey: string
  /** Taille du PDF en bytes. */
  bytes: number
}

/**
 * Construit les props passées au template à partir d'une facture (potentiellement
 * non-persistée, pour la preview) et des settings résolus.
 *
 * On lit en priorité les snapshots de la facture (`issuerSnapshot`, `clientSnapshot`)
 * — c'est l'état figé à l'émission. Si les snapshots sont absents (preview avant
 * persistance), on retombe sur les settings résolus pour issuer et sur les
 * données fournies à la preview pour client (cf. previewPdf controller qui
 * construit un Invoice virtuel avec un clientSnapshot synthétisé).
 */
function buildProps(ctx: InvoiceRenderContext): InvoiceTemplateProps {
  const { invoice, resolvedSettings, organization } = ctx

  const issuer = invoice.issuerSnapshot ?? resolvedSettings.issuer
  if (!invoice.clientSnapshot) {
    throw new Error(
      'invoice_pdf: clientSnapshot manquant — impossible de rendre la facture sans destinataire'
    )
  }

  const brand = resolveBrandTokens(organization)
  const logoUrl = brand.logoUrl ?? null

  return {
    numero: invoice.numero,
    issueDate: invoice.issueDate,
    dueDate: invoice.dueDate,
    paymentTermsDays: invoice.paymentTermsDays ?? resolvedSettings.paymentTermsDays,
    issuer,
    client: invoice.clientSnapshot,
    lines: invoice.lines ?? [],
    tvaBreakdown: invoice.tvaBreakdown ?? [],
    amountHtCents: invoice.amountHtCents ?? 0,
    amountTvaCents: invoice.amountTvaCents ?? 0,
    amountTtcCents: invoice.amountTtcCents,
    penaltyRateText: resolvedSettings.penaltyRateText,
    escompteText: resolvedSettings.escompteText,
    footerLegalText: resolvedSettings.footerLegalText,
    footerNotes: invoice.footerNotes,
    rib: {
      iban: resolvedSettings.rib.iban,
      bic: resolvedSettings.rib.bic,
      bankName: resolvedSettings.rib.bankName,
    },
    accentColor: invoice.themeAccentColor ?? resolvedSettings.accentColor,
    logoUrl,
  }
}

/**
 * Génère le PDF et l'upload sur MinIO. Retourne la storageKey à persister
 * dans `invoices.pdf_storage_key`.
 */
export async function generateInvoicePdf(
  ctx: InvoiceRenderContext
): Promise<GeneratedPdf> {
  const themeSlug = ctx.invoice.themeSlug ?? ctx.resolvedSettings.themeSlug
  const props = buildProps(ctx)
  const buffer = await renderInvoiceToBuffer(themeSlug, props)
  const uploaded = await uploadBuffer(buffer, 'invoice-pdf', ctx.invoice.organizationId)
  return { storageKey: uploaded.storageKey, bytes: uploaded.sizeBytes }
}

/**
 * Génère le PDF sans l'uploader — utilisé pour la preview (stream HTTP direct).
 */
export async function previewInvoicePdf(ctx: InvoiceRenderContext): Promise<Buffer> {
  const themeSlug = ctx.invoice.themeSlug ?? ctx.resolvedSettings.themeSlug
  const props = buildProps(ctx)
  return await renderInvoiceToBuffer(themeSlug, props)
}