"use server";

import { redirect } from "next/navigation";
import { createClient } from "@/lib/supabase/server";
import { verifySession } from "@/lib/dal";
import { NeedFormSchema, type NeedFormState } from "@/lib/validations/needs";

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

export async function createNeed(
  _state: NeedFormState,
  formData: FormData
): Promise<NeedFormState> {
  const user = await verifySession();

  const validatedFields = NeedFormSchema.safeParse({
    title: formData.get("title"),
    description: formData.get("description"),
    categoryId: formData.get("categoryId"),
    city: formData.get("city"),
    region: formData.get("region") || undefined,
    budgetMin: formData.get("budgetMin") || undefined,
    budgetMax: formData.get("budgetMax") || undefined,
  });

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

  const { title, description, categoryId, city, region, budgetMin, budgetMax } =
    validatedFields.data;

  const parsedBudgetMin = budgetMin ? Number(budgetMin) : null;
  const parsedBudgetMax = budgetMax ? Number(budgetMax) : null;

  if (
    (budgetMin && Number.isNaN(parsedBudgetMin)) ||
    (budgetMax && Number.isNaN(parsedBudgetMax))
  ) {
    return { message: "Budget invalide." };
  }
  if (
    parsedBudgetMin !== null &&
    parsedBudgetMax !== null &&
    parsedBudgetMin > parsedBudgetMax
  ) {
    return { message: "Le budget minimum doit être inférieur au maximum." };
  }

  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: need, error } = await supabase
    .from("needs")
    .insert({
      author_id: user.id,
      category_id: categoryId,
      title,
      description,
      city,
      region: region || null,
      budget_min: parsedBudgetMin,
      budget_max: parsedBudgetMax,
    })
    .select("id")
    .single();

  if (error || !need) {
    return { message: "Une erreur est survenue lors de la création du besoin." };
  }

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

    if (!uploadError) {
      await supabase
        .from("need_images")
        .insert({ need_id: need.id, storage_path: path, position: index });
    }
  }

  redirect(`/needs/${need.id}`);
}