"use client";

import { useEffect, useId, useState } from "react";
import {
  getSpecialBusinesses,
  saveSpecialBusinesses,
  type SpecialCarousel,
} from "@/services/special-businesses";
import type { MarketplaceBusiness } from "@/types/business";
import styles from "./MakeSpecialModal.module.css";

export default function MakeSpecialModal({
  business,
  open,
  onClose,
  onSaved,
}: {
  business: MarketplaceBusiness | null;
  open: boolean;
  onClose: () => void;
  onSaved?: () => void;
}) {
  const titleId = useId();
  const [carousels, setCarousels] = useState<SpecialCarousel[]>([]);
  const [loading, setLoading] = useState(false);
  const [savingId, setSavingId] = useState<string | null>(null);
  const [error, setError] = useState("");
  const [status, setStatus] = useState("");

  useEffect(() => {
    if (!open) return;
    let cancelled = false;
    void (async () => {
      setLoading(true);
      setError("");
      setStatus("");
      try {
        const config = await getSpecialBusinesses();
        if (!cancelled) setCarousels(config.carousels);
      } catch (err) {
        if (!cancelled) {
          setError(
            err instanceof Error
              ? err.message
              : "Could not load carousels.",
          );
        }
      } finally {
        if (!cancelled) setLoading(false);
      }
    })();
    return () => {
      cancelled = true;
    };
  }, [open]);

  useEffect(() => {
    if (!open) return;
    const previousOverflow = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    const onKey = (event: KeyboardEvent) => {
      if (event.key === "Escape" && !savingId) onClose();
    };
    window.addEventListener("keydown", onKey);
    return () => {
      document.body.style.overflow = previousOverflow;
      window.removeEventListener("keydown", onKey);
    };
  }, [open, savingId, onClose]);

  if (!open || !business) return null;

  const name = business.name || business.slug;

  async function pickCarousel(carousel: SpecialCarousel) {
    if (!business) return;
    setSavingId(carousel.id);
    setError("");
    setStatus("");
    try {
      const config = await getSpecialBusinesses();
      const nextCarousels = config.carousels.map((item) => {
        if (item.id !== carousel.id) return item;
        if (item.businessIds.includes(business.id)) return item;
        return {
          ...item,
          businessIds: [...item.businessIds, business.id],
        };
      });
      await saveSpecialBusinesses({ carousels: nextCarousels });
      setStatus(`Added to ${carousel.title}`);
      onSaved?.();
      window.setTimeout(() => onClose(), 500);
    } catch (err) {
      setError(
        err instanceof Error
          ? err.message
          : "Could not add business to carousel.",
      );
    } finally {
      setSavingId(null);
    }
  }

  return (
    <div
      className={styles.overlay}
      role="presentation"
      onMouseDown={(event) => {
        if (event.target === event.currentTarget && !savingId) onClose();
      }}
    >
      <div
        className={styles.modal}
        role="dialog"
        aria-modal="true"
        aria-labelledby={titleId}
      >
        <div className={styles.head}>
          <div>
            <p className={styles.kicker}>Make special</p>
            <h2 id={titleId} className={styles.title}>
              Choose a carousel
            </h2>
            <p className={styles.hint}>Add {name} to one of the homepage carousels.</p>
          </div>
          <button
            type="button"
            className={styles.closeBtn}
            aria-label="Close"
            disabled={Boolean(savingId)}
            onClick={onClose}
          >
            ×
          </button>
        </div>

        {loading ? (
          <p className={styles.empty}>Loading carousels…</p>
        ) : error && !carousels.length ? (
          <p className={styles.error} role="alert">
            {error}
          </p>
        ) : carousels.length ? (
          <ul className={styles.list}>
            {carousels.map((carousel) => {
              const alreadyIn = carousel.businessIds.includes(business.id);
              return (
                <li key={carousel.id}>
                  <button
                    type="button"
                    className={styles.item}
                    disabled={Boolean(savingId) || alreadyIn}
                    onClick={() => void pickCarousel(carousel)}
                  >
                    <span className={styles.itemMain}>
                      <span className={styles.itemTitle}>
                        {carousel.title || "Untitled"}
                      </span>
                      {carousel.subtext ? (
                        <span className={styles.itemSubtext}>
                          {carousel.subtext}
                        </span>
                      ) : null}
                    </span>
                    <span className={styles.itemMeta}>
                      {savingId === carousel.id
                        ? "Adding…"
                        : alreadyIn
                          ? "Already in"
                          : `${carousel.businessIds.length} businesses`}
                    </span>
                  </button>
                </li>
              );
            })}
          </ul>
        ) : (
          <p className={styles.empty}>
            No carousels yet. Create one under Website → Carousels.
          </p>
        )}

        {error && carousels.length ? (
          <p className={styles.error} role="alert">
            {error}
          </p>
        ) : null}
        {status ? <p className={styles.status}>{status}</p> : null}
      </div>
    </div>
  );
}