"use server";
import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { api, ApiError, unwrap } from "@/lib/api";
import { attempt, field, type ActionState } from "@/lib/actions";

const done = (id: string) => {
  revalidatePath(`/products/${id}`);
  revalidatePath("/library");
};

/** The person's library and a product: get it, remove it, stay on a revision or follow the latest. */
export async function libraryAction(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  return attempt(async () => {
    const lib = api.library({ id });
    switch (field(form, "intent")) {
      case "get":
        unwrap(await lib.put());
        break;
      case "remove":
        unwrap(await lib.delete());
        break;
      case "stay":
        unwrap(await lib.patch({ stayOn: Number(field(form, "revision")) }));
        break;
      case "follow":
        unwrap(await lib.patch({ stayOn: null }));
        break;
    }
    done(id);
  });
}

/** Its creator deletes the product. */
export async function deleteProduct(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  const state = await attempt(async () => {
    unwrap(await api.products({ id }).delete());
    done(id);
    revalidatePath("/products");
  });
  if (state?.error) return state;
  redirect(`/products/${id}`);
}

/** Moderation removes the product. */
export async function removeProduct(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  const state = await attempt(async () => {
    unwrap(await api.products({ id }).remove.post({ reason: field(form, "reason") }));
    done(id);
    revalidatePath("/products");
  });
  if (state?.error) return state;
  redirect("/products");
}

export async function retract(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  return attempt(async () => {
    unwrap(await api.products({ id }).revisions({ n: Number(field(form, "revision")) }).retract.post());
    done(id);
  });
}

/** Saves a product's info. Fields left out of the form (locked ones are disabled) aren't changed. */
export async function saveProduct(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  const has = (name: string) => form.has(name);
  const rating = field(form, "rating");
  const listed = field(form, "listed");
  return attempt(async () => {
    const { fields } = unwrap(
      await api.products({ id }).patch({
        ...(has("name") ? { name: field(form, "name") } : {}),
        ...(has("description") ? { description: String(form.get("description") ?? "") } : {}),
        ...(rating === "adult" || rating === "general" ? { rating } : {}),
        ...(has("tags")
          ? {
              tags: field(form, "tags")
                .split(",")
                .map((t) => t.trim())
                .filter(Boolean),
            }
          : {}),
        ...(listed === "yes" || listed === "no" ? { listed: listed === "yes" } : {}),
        ...(has("category") ? { category: Number(field(form, "category")) || null } : {}),
        ...(field(form, "reason") ? { reason: field(form, "reason") } : {}),
      }),
    );
    done(id);
    revalidatePath("/products");
    revalidatePath(`/products/${id}/edit`);
    return fields.length ? "Saved." : "Nothing changed.";
  });
}

export async function publishProduct(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  const state = await attempt(async () => {
    unwrap(await api.products({ id }).publish.post());
    done(id);
    revalidatePath("/products");
    revalidatePath("/console/products");
  });
  if (state?.error) return state;
  redirect(`/products/${id}`);
}

/** Moderators lock fields: the checked ones are locked, the rest unlocked. */
export async function saveLocks(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  const fields = form
    .getAll("locked")
    .filter((v): v is "name" | "description" | "rating" | "tags" | "listed" | "category" =>
      ["name", "description", "rating", "tags", "listed", "category"].includes(String(v)),
    );
  return attempt(async () => {
    unwrap(await api.products({ id }).locks.put({ fields, reason: field(form, "reason") }));
    done(id);
    revalidatePath(`/products/${id}/edit`);
    return "Locks saved.";
  });
}

/** Puts back what a history entry changed. */
export async function revertInfo(_: ActionState, form: FormData): Promise<ActionState> {
  const id = field(form, "id");
  return attempt(async () => {
    const reason = field(form, "reason");
    unwrap(
      await api
        .products({ id })
        .history({ entry: Number(field(form, "entry")) })
        .revert.post(reason ? { reason } : {}),
    );
    done(id);
    revalidatePath(`/products/${id}/edit`);
    return "Undone.";
  });
}

/** An upload token and the catalog's upload address, for the browser to send the file there itself. */
export async function startUpload(
  catalog: string,
  product?: string,
): Promise<{ token: string; url: string } | { error: string }> {
  try {
    return unwrap(await api.products.upload.post({ catalog, ...(product ? { product } : {}) }));
  } catch (e) {
    if (e instanceof ApiError) return { error: e.message };
    throw e;
  }
}