"use server";

import { redirect } from "next/navigation";
import { revalidatePath } from "next/cache";
import { createClient } from "@/lib/supabase/server";
import { verifySession } from "@/lib/dal";
import { OfferFormSchema, type OfferFormState } from "@/lib/validations/offers";

const MAX_IMAGES = 5;
const MAX_IMAGE_SIZE = 5 * 1024 * 1024; // 5 Mo

export async function createOffer(
  _state: OfferFormState,
  formData: FormData
): Promise<OfferFormState> {
  const user = await verifySession();
  const needId = formData.get("needId");

  if (typeof needId !== "string" || !needId) {
    return { message: "Besoin introuvable." };
  }

  const validatedFields = OfferFormSchema.safeParse({
    title: formData.get("title"),
    description: formData.get("description"),
    price: formData.get("price"),
  });

  if (!validatedFields.success) {
    return { errors: validatedFields.error.flatten().fieldErrors };
  }

  const { title, description, price } = validatedFields.data;
  const parsedPrice = Number(price);

  if (Number.isNaN(parsedPrice) || parsedPrice <= 0) {
    return { message: "Prix invalide." };
  }

  const images = formData
    .getAll("images")
    .filter((entry): entry is File => entry instanceof File && entry.size > 0);

  if (images.length > MAX_IMAGES) {
    return { message: `${MAX_IMAGES} images maximum.` };
  }
  if (images.some((file) => file.size > MAX_IMAGE_SIZE)) {
    return { message: "Chaque image doit faire moins de 5 Mo." };
  }

  const supabase = await createClient();

  const { data: offer, error } = await supabase
    .from("offers")
    .insert({
      need_id: needId,
      merchant_id: user.id,
      title,
      description,
      price: parsedPrice,
    })
    .select("id")
    .single();

  if (error || !offer) {
    return {
      message:
        "Impossible de créer l'offre (le besoin n'est peut-être plus ouvert, ou tu as déjà proposé une offre).",
    };
  }

  for (const [index, file] of images.entries()) {
    const path = `${user.id}/${offer.id}/${index}-${file.name}`;
    const { error: uploadError } = await supabase.storage
      .from("offer-images")
      .upload(path, file);

    if (!uploadError) {
      await supabase
        .from("offer_images")
        .insert({ offer_id: offer.id, storage_path: path, position: index });
    }
  }

  revalidatePath(`/needs/${needId}`);
  redirect(`/needs/${needId}`);
}

export async function withdrawOffer(offerId: string, needId: string) {
  await verifySession();
  const supabase = await createClient();
  await supabase
    .from("offers")
    .update({ status: "withdrawn" })
    .eq("id", offerId)
    .eq("status", "pending");

  revalidatePath(`/needs/${needId}`);
}

export async function acceptOffer(offerId: string, needId: string) {
  await verifySession();
  const supabase = await createClient();

  const { data: conversationId, error } = await supabase.rpc("accept_offer", {
    p_offer_id: offerId,
  });

  if (error || !conversationId) {
    revalidatePath(`/needs/${needId}`);
    return;
  }

  redirect(`/messages/${conversationId}`);
}