import { TRPCError } from "@trpc/server";
import { and, eq } from "drizzle-orm";
import { events, getDb, photoJobs, photos, submissions } from "@album/database";
import {
  completePhotoInputSchema,
  createPhotoInputSchema,
  MAX_PHOTO_BYTES,
} from "@album/contracts";
import {
  createPresignedPutUrl,
  headObject,
  originalObjectKey,
} from "@album/storage";
import { createTRPCRouter, publicProcedure } from "../trpc";
import { consumeRateLimit } from "@/server/rate-limit";
import { hashToken } from "@/server/tokens";
import { guests } from "@album/database";
import { effectiveEvent } from "@/lib/event-lifecycle";

export const photosRouter = createTRPCRouter({
  create: publicProcedure
    .input(createPhotoInputSchema)
    .mutation(async ({ ctx, input }) => {
      const [stored] = await getDb()
        .select()
        .from(events)
        .where(eq(events.slug, input.eventSlug))
        .limit(1);
      const event = stored ? effectiveEvent(stored) : null;
      if (!event || event.status === "draft") {
        throw new TRPCError({ code: "NOT_FOUND", message: "Event not found" });
      }
      if (event.status === "closed" || !event.uploadEnabled) {
        throw new TRPCError({
          code: "FORBIDDEN",
          message: "Uploads are closed for this event",
        });
      }
      const [submission] = await getDb()
        .select()
        .from(submissions)
        .where(and(eq(submissions.id, input.submissionId), eq(submissions.eventId, event.id)))
        .limit(1);
      if (!submission || submission.eventId !== event.id) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Submission not found",
        });
      }
      const token = ctx.guestTokenForEvent(event.id);
      if (!token) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Guest session is missing",
        });
      }
      const [guest] = await getDb()
        .select()
        .from(guests)
        .where(
          and(
            eq(guests.id, submission.guestId),
            eq(guests.eventId, event.id),
            eq(guests.tokenHash, hashToken(token)),
          ),
        )
        .limit(1);
      if (!guest) {
        throw new TRPCError({
          code: "FORBIDDEN",
          message: "Guest session does not match this submission",
        });
      }
      const limit = await consumeRateLimit({
        namespace: `upload:${event.id}`,
        identifier: ctx.clientIdentifier,
        limit: 40,
        windowMs: 10 * 60 * 1000,
      });
      if (!limit.allowed) {
        throw new TRPCError({
          code: "TOO_MANY_REQUESTS",
          message: "Too many uploads. Try again shortly.",
        });
      }
      const [photo] = await getDb()
        .insert(photos)
        .values({
          eventId: event.id,
          submissionId: submission.id,
          processingStatus: "uploading",
          visibility: event.galleryPolicy === "automatic" ? "public" : "pending",
          originalKey: "pending",
          contentType: input.contentType,
          byteSize: input.byteSize,
        })
        .returning();
      if (!photo) throw new TRPCError({ code: "INTERNAL_SERVER_ERROR" });
      const key = originalObjectKey(event.id, photo.id);
      await getDb()
        .update(photos)
        .set({ originalKey: key, updatedAt: new Date() })
        .where(and(eq(photos.id, photo.id), eq(photos.eventId, event.id)));
      const uploadUrl = await createPresignedPutUrl({
        key,
        contentType: input.contentType,
      });
      return { photoId: photo.id, uploadUrl };
    }),

  complete: publicProcedure
    .input(completePhotoInputSchema)
    .mutation(async ({ ctx, input }) => {
      const [photo] = await getDb()
        .select()
        .from(photos)
        .where(eq(photos.id, input.photoId))
        .limit(1);
      if (!photo) throw new TRPCError({ code: "NOT_FOUND" });
      const token = ctx.guestTokenForEvent(photo.eventId);
      const [owner] = token ? await getDb().select({ id: guests.id }).from(guests)
        .innerJoin(submissions, and(eq(submissions.guestId, guests.id), eq(submissions.eventId, photo.eventId)))
        .where(and(eq(submissions.id, photo.submissionId), eq(guests.eventId, photo.eventId), eq(guests.tokenHash, hashToken(token)))).limit(1) : [];
      if (!owner) throw new TRPCError({ code: "FORBIDDEN", message: "Guest session does not match this upload" });
      if (photo.processingStatus !== "uploading") {
        return {
          photoId: photo.id,
          processingStatus: photo.processingStatus,
        };
      }
      const head = await headObject(photo.originalKey);
      if (!head) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Upload was not found. Try again.",
        });
      }
      const size = Number(head.ContentLength ?? 0);
      if (size <= 0 || size > MAX_PHOTO_BYTES) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "That file is empty or larger than 25 MB.",
        });
      }
      await getDb().transaction(async (tx) => {
        const changed = await tx
          .update(photos)
          .set({
            processingStatus: "processing",
            byteSize: size,
            updatedAt: new Date(),
          })
          .where(and(eq(photos.id, photo.id), eq(photos.eventId, photo.eventId), eq(photos.processingStatus, "uploading")))
          .returning({ id: photos.id });
        if (!changed.length) return;
        await tx.insert(photoJobs).values({
          photoId: photo.id,
          kind: "transcode",
          status: "pending",
        });
      });
      return { photoId: photo.id, processingStatus: "processing" as const };
    }),
});