/**
 * @file PetMenu.tsx
 * @description The mascot's right-click menu: hide it, size it, choose the
 * pet it wears — Sagi, a featured pet (downloaded from codex-pets.net into
 * this install on the first pick, `POST /api/pets/featured/:id`), or one of
 * your own (deletable) — upload an image or import a `.codex-pet.zip`, browse
 * codex-pets.net for more, and open the Sagi settings. The choice and the size
 * are viewer preferences (`prefs.ts`); the pets themselves live on the server
 * (`server/lib/pets.js`); the list and its actions are `usePets`, shared
 * with Settings → Appearance.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import {
  Check,
  ChevronDown,
  ChevronRight,
  Download,
  EyeOff,
  ExternalLink,
  Loader2,
  PackageOpen,
  Settings2,
  Trash2,
  Upload,
} from "lucide-react";
import { PET_SIZE, sagiPrefs, type PetChoice } from "./prefs";
import { usePets } from "./usePets";
import { toast } from "../../lib/toast";

const ITEM =
  "flex w-full items-center gap-2.5 rounded-md px-2.5 py-1.5 text-left text-sm text-fg-secondary hover:bg-surface-4 hover:text-fg-primary disabled:opacity-50";

export function PetMenu({
  pet,
  size,
  onClose,
  onSettings,
}: {
  pet: PetChoice;
  size: number;
  onClose: () => void;
  onSettings: () => void;
}) {
  const { t } = useTranslation("settings");
  const ref = useRef<HTMLDivElement>(null);
  const imageInput = useRef<HTMLInputElement>(null);
  const bundleInput = useRef<HTMLInputElement>(null);
  const [choosing, setChoosing] = useState(false);
  const { list, own, installed, busy, error, wear, install, add, remove } = usePets();

  // Closes on a press outside the menu, or Escape.
  useEffect(() => {
    const onDown = (e: MouseEvent) => {
      if (!ref.current?.contains(e.target as Node)) onClose();
    };
    const onKey = (e: KeyboardEvent) => e.key === "Escape" && onClose();
    document.addEventListener("mousedown", onDown);
    document.addEventListener("keydown", onKey);
    return () => {
      document.removeEventListener("mousedown", onDown);
      document.removeEventListener("keydown", onKey);
    };
  }, [onClose]);

  const addFile = (file: File | undefined, bundle: boolean) => file && void add(file, bundle);
  const mark = (id: string) =>
    pet.id === id ? <Check className="ml-auto h-3.5 w-3.5 shrink-0 text-accent" /> : null;

  return (
    <div
      ref={ref}
      role="menu"
      data-testid="pet-menu"
      className="w-72 rounded-xl border border-border bg-surface-2 p-1.5 text-sm shadow-lg"
    >
      <div className="px-2.5 pb-1 pt-0.5 text-xs font-medium text-fg-muted">
        {t("sagi.pet.title")}
      </div>
      <button
        type="button"
        role="menuitem"
        className={ITEM}
        onClick={() => {
          sagiPrefs.setEnabled(false);
          toast.info(t("sagi.pet.hiddenToast"));
          onClose();
        }}
      >
        <EyeOff className="h-4 w-4" />
        {t("sagi.pet.hide")}
      </button>
      <label className="block px-2.5 py-1.5">
        <span className="flex items-center justify-between text-sm text-fg-secondary">
          {t("sagi.pet.size")}
          <span className="tabular-nums text-xs text-fg-muted">{size}px</span>
        </span>
        <input
          type="range"
          data-testid="pet-size"
          min={PET_SIZE.min}
          max={PET_SIZE.max}
          value={size}
          onChange={(e) => sagiPrefs.setSize(Number(e.target.value))}
          className="mt-1 w-full accent-[rgb(var(--accent))]"
        />
      </label>
      <div className="my-1.5 border-t border-border" />
      <button
        type="button"
        role="menuitem"
        aria-expanded={choosing}
        data-testid="pet-choose"
        className={ITEM}
        onClick={() => setChoosing((v) => !v)}
      >
        {choosing ? <ChevronDown className="h-4 w-4" /> : <ChevronRight className="h-4 w-4" />}
        {t("sagi.pet.choose")}
      </button>
      {choosing && (
        <div className="max-h-80 overflow-y-auto pl-2">
          <button
            type="button"
            role="menuitemradio"
            aria-checked={pet.id === "sagi"}
            className={ITEM}
            onClick={() => sagiPrefs.setPet({ id: "sagi" })}
          >
            Sagi
            {mark("sagi")}
          </button>
          {list?.featured.map((f) => {
            const have = installed.get(f.id);
            return (
              <button
                key={f.id}
                type="button"
                role="menuitemradio"
                aria-checked={!!have && pet.id === have.id}
                data-testid={`pet-featured-${f.id}`}
                disabled={busy !== null}
                title={t("sagi.pet.featuredBy", { by: f.by })}
                className={ITEM}
                onClick={() => (have ? wear(have) : void install(f.id))}
              >
                <span className="min-w-0 truncate">{f.displayName}</span>
                {busy === f.id ? (
                  <Loader2 className="ml-auto h-3.5 w-3.5 shrink-0 animate-spin" />
                ) : have ? (
                  mark(have.id)
                ) : (
                  <Download
                    aria-label={t("sagi.pet.download")}
                    className="ml-auto h-3.5 w-3.5 shrink-0 text-fg-muted"
                  />
                )}
              </button>
            );
          })}
          {own.length > 0 && <div className="my-1.5 border-t border-border" />}
          {own.map((p) => (
            <div key={p.id} className="group flex items-center">
              <button
                type="button"
                role="menuitemradio"
                aria-checked={pet.id === p.id}
                data-testid={`pet-own-${p.id}`}
                className={ITEM}
                onClick={() => wear(p)}
              >
                <span className="min-w-0 truncate">{p.displayName}</span>
                {mark(p.id)}
              </button>
              <button
                type="button"
                data-testid={`pet-delete-${p.id}`}
                aria-label={t("sagi.pet.delete", { name: p.displayName })}
                title={t("sagi.pet.delete", { name: p.displayName })}
                disabled={busy !== null}
                onClick={() => void remove(p)}
                className="rounded p-1 text-fg-muted hover:bg-surface-4 hover:text-status-danger"
              >
                <Trash2 className="h-3.5 w-3.5" />
              </button>
            </div>
          ))}
          <div className="my-1.5 border-t border-border" />
          <button
            type="button"
            role="menuitem"
            disabled={busy !== null}
            className={ITEM}
            onClick={() => imageInput.current?.click()}
          >
            {busy === "image" ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <Upload className="h-4 w-4" />
            )}
            {t("sagi.pet.upload")}
          </button>
          <button
            type="button"
            role="menuitem"
            disabled={busy !== null}
            className={ITEM}
            onClick={() => bundleInput.current?.click()}
          >
            {busy === "bundle" ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <PackageOpen className="h-4 w-4" />
            )}
            {t("sagi.pet.import")}
          </button>
          <a
            href="https://codex-pets.net/"
            target="_blank"
            rel="noreferrer noopener"
            className={`${ITEM} !text-fg-muted`}
          >
            <ExternalLink className="h-4 w-4" />
            {t("sagi.pet.browse")}
          </a>
        </div>
      )}
      <input
        ref={imageInput}
        type="file"
        hidden
        data-testid="pet-image-input"
        accept="image/png,image/jpeg,image/gif,image/webp"
        onChange={(e) => {
          addFile(e.target.files?.[0], false);
          e.target.value = "";
        }}
      />
      <input
        ref={bundleInput}
        type="file"
        hidden
        data-testid="pet-bundle-input"
        accept=".zip,application/zip"
        onChange={(e) => {
          addFile(e.target.files?.[0], true);
          e.target.value = "";
        }}
      />
      {error && (
        <p role="alert" className="px-2.5 py-1 text-xs text-status-danger">
          {error}
        </p>
      )}
      <div className="my-1.5 border-t border-border" />
      <button
        type="button"
        role="menuitem"
        className={`${ITEM} !text-fg-muted`}
        onClick={onSettings}
      >
        <Settings2 className="h-4 w-4" />
        {t("sagi.pet.settings")}
      </button>
    </div>
  );
}