"use server";

import { redirect } from "next/navigation";
import { revalidatePath } from "next/cache";
import { parseStrongShareText } from "@/lib/strong/parser";
import { upsertStrengthWorkout } from "@/lib/models/strength";
import { getCurrentUserId } from "@/lib/session";

export type ImportStrongWorkoutState = { error: string } | null;

export async function importStrongWorkout(
  _prevState: ImportStrongWorkoutState,
  formData: FormData
): Promise<ImportStrongWorkoutState> {
  const text = formData.get("text");
  if (typeof text !== "string" || text.trim().length === 0) {
    return { error: "Wklej tekst wygenerowany przez funkcję 'Share workout' w Strong." };
  }

  let workouts;
  try {
    workouts = parseStrongShareText(text);
  } catch (error) {
    return { error: error instanceof Error ? error.message : "Nie udało się przetworzyć tekstu." };
  }

  if (workouts.length === 0) {
    return { error: "Nie znaleziono żadnego treningu w podanym tekście." };
  }

  const userId = await getCurrentUserId();
  for (const workout of workouts) {
    await upsertStrengthWorkout(userId, workout);
  }

  revalidatePath("/strength");
  revalidatePath("/");
  redirect("/strength");
}