import { z } from "zod";
import { storage } from "@/server/storage/adapter";
import { dispatchJob } from "@/server/jobs/dispatch";
import { JOB_QUEUES } from "@/server/jobs/queues";
import { ServiceError, type ServiceCtx } from "@/server/services/context";
import { audit, isUniqueViolation, requireFieldOrder } from "./common";
import { storeFile } from "@/server/services/documents/store";
import { sniffMime } from "./mime";

/**
 * Binary uploads of the mobile app (ARCHITEKTUR §4.6: POST /api/v1/uploads → documentId).
 * Idempotent per tenant over the device `clientId` (stored as the document lineage
 * `upload:<tenantId>:<clientId>`, so the same clientId in another tenant never collides).
 * The client sends a compressed image plus an optional 400 px thumbnail; without a thumbnail
 * the image-derivatives job creates one.
 */

export const uploadMetaSchema = z.object({
  clientId: z.string().uuid(),
  workOrderId: z.string().min(1).max(64),
  kind: z.enum(["photo", "voice_note"]),
});
export type UploadMeta = z.infer<typeof uploadMetaSchema>;

export type UploadFile = { bytes: Buffer; name: string; type: string };

const MAX_PREVIEW_BYTES = 2 * 1024 * 1024;

export function uploadLineageId(tenantId: string, clientId: string): string {
  return `upload:${tenantId}:${clientId}`;
}

export async function storeFieldUpload(
  ctx: ServiceCtx,
  meta: UploadMeta,
  file: UploadFile,
  preview?: UploadFile | null,
): Promise<{ documentId: string; duplicate: boolean }> {
  const wo = await requireFieldOrder(ctx, meta.workOrderId, { editable: true });
  const lineageId = uploadLineageId(ctx.tenantId, meta.clientId);

  const replay = async () => {
    const existing = await ctx.db.document.findFirst({ where: { lineageId }, orderBy: { version: "asc" }, select: { id: true, workOrderId: true, uploadedById: true } });
    if (!existing) return null;
    if (existing.workOrderId !== wo.id || existing.uploadedById !== ctx.userId) throw new ServiceError("invalid", "clientId already used");
    return { documentId: existing.id, duplicate: true };
  };
  const prior = await replay();
  if (prior) return prior;

  const sniffed = sniffMime(file.bytes);
  const expectedKind = meta.kind === "photo" ? "image" : "audio";
  if (!sniffed || sniffed.kind !== expectedKind) throw new ServiceError("invalid", `file is not a valid ${expectedKind}`);

  // The central store treats `lineageId` as "new version of an existing document", so the file is
  // stored as a fresh document and the deterministic upload lineage (idempotency key per device
  // clientId) is attached afterwards. A concurrent upload with the same clientId loses the unique
  // (lineageId, version) race: its document is soft-deleted and the winner is returned.
  const created = await storeFile(ctx, {
    bytes: file.bytes,
    fileName: file.name || (meta.kind === "photo" ? "foto.jpg" : "sprachnotiz.webm"),
    declaredMime: file.type || sniffed.mime,
    category: meta.kind,
    visibility: "team",
    links: { workOrderId: wo.id, siteId: wo.siteId, customerId: wo.customerId },
  });
  let doc;
  try {
    doc = await ctx.db.document.update({ where: { id: created.id }, data: { lineageId } });
  } catch (err) {
    if (isUniqueViolation(err)) {
      await ctx.db.document.update({ where: { id: created.id }, data: { deletedAt: new Date() } });
      const raced = await replay();
      if (raced) return raced;
    }
    throw err;
  }

  if (meta.kind === "photo") {
    const previewMime = preview ? sniffMime(preview.bytes) : null;
    if (preview && previewMime?.kind === "image" && preview.bytes.byteLength <= MAX_PREVIEW_BYTES) {
      const stored = await storage.put({ tenantId: ctx.tenantId, filename: `thumb-${doc.fileName}`, contentType: previewMime.mime, bytes: preview.bytes });
      doc = await ctx.db.document.update({ where: { id: doc.id }, data: { previewKey: stored.storageKey } });
    } else {
      try {
        await dispatchJob(JOB_QUEUES.imageDerivatives, { tenantId: ctx.tenantId, entityId: doc.id, actorId: ctx.userId });
      } catch (err) {
        // thumbnails are optional — the original stays usable
        console.error("[field] image-derivatives dispatch failed:", (err as Error).message);
      }
    }
  }

  await audit(ctx, "create", "document", doc.id, null, {
    workOrderId: wo.id,
    category: doc.category,
    fileName: doc.fileName,
    mimeType: doc.mimeType,
    fileSize: doc.fileSize,
    checksum: doc.checksum,
  });
  return { documentId: doc.id, duplicate: false };
}