/**
 * Admin UI Primitives
 *
 * Single source of truth for admin panel styling.
 * Every input, select, button, badge, card, and modal in /admin should use these.
 */

import { type ComponentPropsWithoutRef, forwardRef } from "react";
import { X } from "lucide-react";
import { useFocusTrap } from "@/hooks/useFocusTrap";

/* ============================== */
/*           Style tokens         */
/* ============================== */

export const adminStyles = {
  /** Standard input — full width, rounded-lg */
  input:
    "w-full rounded-lg border border-neutral-200 bg-neutral-100 px-4 py-2.5 text-neutral-900 placeholder-neutral-400 outline-none hover:border-gold/30 focus:border-gold transition-colors dark:border-white/10 dark:bg-neutral-800 dark:text-white dark:placeholder-neutral-500",

  /** Compact input — smaller padding, text-sm */
  inputSm:
    "rounded-md border border-neutral-200 bg-neutral-100 px-2.5 py-1.5 text-sm text-neutral-900 placeholder-neutral-400 outline-none hover:border-gold/30 focus:border-gold transition-colors dark:border-white/10 dark:bg-neutral-800 dark:text-white dark:placeholder-neutral-600",

  /** Dashed input — for "add new" fields */
  inputDashed:
    "flex-1 rounded-lg border border-dashed border-neutral-200 bg-neutral-100/50 px-4 py-2 text-sm text-neutral-900 placeholder-neutral-400 outline-none hover:border-gold/30 hover:placeholder-neutral-500 focus:border-gold/50 transition-colors dark:border-white/10 dark:bg-neutral-800/50 dark:text-white dark:placeholder-neutral-600",

  /** Textarea — same as input + resize-none */
  textarea:
    "w-full rounded-lg border border-neutral-200 bg-neutral-100 px-4 py-2.5 text-neutral-900 placeholder-neutral-400 outline-none hover:border-gold/30 focus:border-gold transition-colors resize-none dark:border-white/10 dark:bg-neutral-800 dark:text-white dark:placeholder-neutral-500",

  /** Native select */
  select:
    "w-full rounded-lg border border-neutral-200 bg-neutral-100 px-3 py-2 text-sm text-neutral-900 outline-none focus:border-gold/40 transition-colors [color-scheme:light] dark:border-white/10 dark:bg-neutral-800 dark:text-white dark:[color-scheme:dark]",

  /** Select option */
  option: "bg-white dark:bg-neutral-900",

  /** Primary button — gold solid */
  btnPrimary:
    "inline-flex items-center justify-center gap-2 rounded-lg bg-gold px-4 py-2.5 text-sm font-medium text-black transition-all hover:bg-gold-light hover:opacity-90 disabled:opacity-50 disabled:cursor-not-allowed",

  /** Secondary button — outline */
  btnSecondary:
    "inline-flex items-center justify-center gap-2 rounded-lg border border-neutral-200 bg-neutral-100 px-4 py-2.5 text-sm font-medium text-neutral-700 transition-colors hover:bg-neutral-200 dark:border-white/10 dark:bg-neutral-800 dark:text-neutral-300 dark:hover:bg-neutral-700",

  /** Small gold accent button */
  btnGoldSm:
    "rounded-md bg-gold/20 border border-gold/30 px-3 py-1 text-xs font-medium text-amber-700 hover:bg-gold/30 transition-colors disabled:opacity-30 disabled:cursor-not-allowed dark:text-gold",

  /** Cancel/muted small button */
  btnCancelSm:
    "rounded-md border border-neutral-200 px-3 py-1 text-xs text-neutral-500 hover:text-neutral-900 hover:border-neutral-300 transition-colors dark:border-white/10 dark:text-neutral-400 dark:hover:text-white dark:hover:border-white/25",

  /** Danger button */
  btnDanger:
    "inline-flex items-center justify-center gap-2 rounded-lg bg-red-600 px-4 py-2.5 text-sm font-medium text-white transition-colors hover:bg-red-500",

  /** Card container */
  card:
    "rounded-xl border border-neutral-200 bg-white p-5 dark:border-white/10 dark:bg-neutral-900",

  /** Modal overlay */
  modalOverlay:
    "fixed inset-0 z-50 flex items-center justify-center p-4",

  /** Modal backdrop */
  modalBackdrop:
    "absolute inset-0 bg-black/70 backdrop-blur-sm",

  /** Modal content */
  modalContent:
    "relative w-full rounded-2xl border border-neutral-200 bg-white p-6 shadow-2xl dark:border-white/[0.08] dark:bg-[#0a0a0a]",

  /** Modal close button */
  modalClose:
    "absolute right-3 top-3 flex h-8 w-8 items-center justify-center rounded-full text-neutral-500 hover:bg-neutral-100 hover:text-neutral-900 transition-colors cursor-pointer dark:hover:bg-white/[0.06] dark:hover:text-white",

  /** Label */
  label:
    "block text-xs font-medium uppercase tracking-wider text-neutral-500 dark:text-neutral-400",

  /** Section heading in admin */
  sectionTitle:
    "text-lg font-bold text-neutral-900 dark:text-white",

  /** Dashed add-item button */
  addButton:
    "flex items-center gap-2 rounded-lg border border-dashed border-neutral-300 px-4 py-2.5 text-sm text-neutral-500 hover:text-neutral-900 hover:border-neutral-400 transition-colors dark:border-white/20 dark:text-neutral-400 dark:hover:text-white dark:hover:border-white/40",
} as const;

/* ============================== */
/*         Input components       */
/* ============================== */

interface AdminInputProps extends ComponentPropsWithoutRef<"input"> {
  variant?: "default" | "sm" | "dashed";
}

export const AdminInput = forwardRef<HTMLInputElement, AdminInputProps>(
  function AdminInput({ variant = "default", className = "", ...props }, ref) {
    const base =
      variant === "sm" ? adminStyles.inputSm
      : variant === "dashed" ? adminStyles.inputDashed
      : adminStyles.input;
    return <input ref={ref} className={`${base} ${className}`} {...props} />;
  },
);

interface AdminTextareaProps extends ComponentPropsWithoutRef<"textarea"> {
  autoResize?: boolean;
}

export const AdminTextarea = forwardRef<HTMLTextAreaElement, AdminTextareaProps>(
  function AdminTextarea({ autoResize, className = "", ...props }, ref) {
    function handleInput(e: React.FormEvent<HTMLTextAreaElement>) {
      if (autoResize) {
        const el = e.currentTarget;
        el.style.height = "auto";
        el.style.height = el.scrollHeight + "px";
      }
    }
    return (
      <textarea
        ref={ref}
        className={`${adminStyles.textarea} ${className}`}
        {...props}
        {...(autoResize ? { onInput: handleInput } : {})}
      />
    );
  },
);

interface AdminSelectProps extends ComponentPropsWithoutRef<"select"> {
  children: React.ReactNode;
}

export const AdminSelect = forwardRef<HTMLSelectElement, AdminSelectProps>(
  function AdminSelect({ className = "", children, ...props }, ref) {
    return (
      <select ref={ref} className={`${adminStyles.select} ${className}`} {...props}>
        {children}
      </select>
    );
  },
);

/* ============================== */
/*        Button components       */
/* ============================== */

interface AdminButtonProps extends ComponentPropsWithoutRef<"button"> {
  variant?: "primary" | "secondary" | "danger" | "goldSm" | "cancelSm";
}

export function AdminButton({ variant = "primary", className = "", ...props }: AdminButtonProps) {
  const base =
    variant === "secondary" ? adminStyles.btnSecondary
    : variant === "danger" ? adminStyles.btnDanger
    : variant === "goldSm" ? adminStyles.btnGoldSm
    : variant === "cancelSm" ? adminStyles.btnCancelSm
    : adminStyles.btnPrimary;
  return <button className={`${base} ${className}`} {...props} />;
}

/* ============================== */
/*        Modal component         */
/* ============================== */

interface AdminModalProps {
  open: boolean;
  onClose: () => void;
  title?: string;
  maxWidth?: string;
  children: React.ReactNode;
}

export function AdminModal({ open, onClose, title, maxWidth = "max-w-sm", children }: AdminModalProps) {
  const focusTrapRef = useFocusTrap<HTMLDivElement>(open);

  if (!open) return null;

  return (
    <div className={adminStyles.modalOverlay} onClick={onClose}>
      <div className={adminStyles.modalBackdrop} />
      <div
        ref={focusTrapRef}
        className={`${adminStyles.modalContent} ${maxWidth}`}
        onClick={(e) => e.stopPropagation()}
        role="dialog"
        aria-modal="true"
        aria-label={title}
      >
        <button onClick={onClose} className={adminStyles.modalClose} aria-label="Закрыть">
          <X size={16} />
        </button>
        {title && <h3 className="text-sm font-bold text-neutral-900 dark:text-white mb-4">{title}</h3>}
        {children}
      </div>
    </div>
  );
}