"use client";
import { useI18n } from "@/components/I18nProvider";

import { useEffect, useRef, useState } from "react";
import { Panorama } from "./Panorama";
import { api } from "./StartGame";
import {
  ChevronLeft,
  ChevronRight,
  X,
  Move,
  Expand,
  Minimize,
} from "lucide-react";

export function PanoramaPreview({
  endpoint,
  initialId,
  onClose,
}: {
  endpoint: string;
  initialId?: string;
  onClose: () => void;
}) {
  const { t } = useI18n();
  const dialog = useRef<HTMLDialogElement>(null);
  const closeButton = useRef<HTMLButtonElement>(null);
  const [expanded, setExpanded] = useState(false);
  const [locations, setLocations] = useState<string[]>([]),
    [selected, setSelected] = useState(initialId ?? ""),
    [urls, setUrls] = useState<string[] | null>(null),
    [ready, setReady] = useState(false),
    [error, setError] = useState("");
  const [labels, setLabels] = useState<Record<string, string>>({});
  useEffect(() => {
    const element = dialog.current;
    const previousFocus =
      document.activeElement instanceof HTMLElement
        ? document.activeElement
        : null;
    const overflow = document.body.style.overflow;
    if (element && !element.open) element.showModal();
    document.body.style.overflow = "hidden";
    closeButton.current?.focus();
    let disposed = false;
    api<{ locations: string[]; labels?: Record<string, string> }>(endpoint)
      .then((d) => {
        if (disposed) return;
        if (!Array.isArray(d.locations))
          throw new Error(
            "Could not load the submitted locations. Please try again.",
          );
        setLocations(d.locations);
        setLabels(d.labels ?? {});
        setSelected((s) =>
          d.locations.includes(s) ? s : (d.locations[0] ?? ""),
        );
      })
      .catch((e) => {
        if (!disposed) setError(e.message);
      });
    return () => {
      disposed = true;
      element?.close();
      document.body.style.overflow = overflow;
      previousFocus?.focus();
    };
  }, [endpoint]);
  useEffect(() => {
    if (!selected) return;
    let disposed = false;
    setUrls(null);
    setReady(false);
    setError("");
    api<{ faces: string[] }>(`${endpoint}/${selected}`)
      .then((d) => {
        if (!disposed) setUrls(d.faces);
      })
      .catch((e) => {
        if (!disposed) setError(e.message);
      });
    return () => {
      disposed = true;
    };
  }, [endpoint, selected]);
  const index = locations.indexOf(selected);
  return (
    <dialog
      ref={dialog}
      className={`panorama-preview${expanded ? " is-expanded" : ""}`}
      aria-labelledby="panorama-preview-title"
      onCancel={(e) => {
        e.preventDefault();
        onClose();
      }}
      onClick={(e) => {
        if (e.target === e.currentTarget) {
          const box = e.currentTarget.getBoundingClientRect();
          if (
            e.clientX < box.left ||
            e.clientX > box.right ||
            e.clientY < box.top ||
            e.clientY > box.bottom
          )
            onClose();
        }
      }}
    >
      <header className="preview-header">
        <div>
          <span className="eyebrow">{t("360° PANORAMA")}</span>
          <h2 id="panorama-preview-title">{t("A closer look.")}</h2>
        </div>
        <div className="preview-header-actions">
          <button
            className="icon-button"
            aria-label={
              expanded ? t("Restore preview size") : t("Expand preview")
            }
            onClick={() => setExpanded(!expanded)}
          >
            {expanded ? <Minimize size={19} /> : <Expand size={19} />}
          </button>
          <button
            ref={closeButton}
            className="icon-button"
            aria-label={t("Close preview")}
            onClick={onClose}
          >
            <X size={21} />
          </button>
        </div>
      </header>
      <div className="preview-toolbar">
        <label className="preview-location">
          <span>{t("Location")}</span>
          <select
            aria-label={t("Preview location")}
            value={selected}
            onChange={(e) => setSelected(e.target.value)}
          >
            {locations.map((p) => (
              <option key={p} value={p}>
                {labels[p] ?? p}
              </option>
            ))}
          </select>
        </label>
        <span className="preview-counter">
          {index >= 0 ? index + 1 : 0} / {locations.length}
        </span>
        <div className="preview-navigation">
          <button
            className="icon-button"
            aria-label={t("Previous panorama")}
            disabled={index <= 0}
            onClick={() => setSelected(locations[index - 1])}
          >
            <ChevronLeft size={21} />
          </button>
          <button
            className="icon-button"
            aria-label={t("Next panorama")}
            disabled={index < 0 || index >= locations.length - 1}
            onClick={() => setSelected(locations[index + 1])}
          >
            <ChevronRight size={21} />
          </button>
        </div>
      </div>
      <div className="preview-viewport">
        {urls && (
          <Panorama
            urls={urls}
            zoom
            onReady={() => setReady(true)}
            onError={setError}
          />
        )}
        {error ? (
          <p role="alert" className="preview-status">
            {t(error)}
          </p>
        ) : (
          !ready && (
            <p role="status" className="preview-status">
              {t("Loading panorama…")}
            </p>
          )
        )}
      </div>
      <footer className="preview-footer">
        <span>
          <Move size={16} />
          {t("Drag to look around · Scroll to zoom")}
        </span>
        <span>{t("Check for blocked views and missing terrain.")}</span>
      </footer>
    </dialog>
  );
}