'use client';

import { useState, useEffect, useRef } from 'react';
import { createPortal } from 'react-dom';
import { XMarkIcon, EllipsisVerticalIcon } from '@heroicons/react/24/outline';
import clsx from 'clsx';

// ----- Skeleton loaders -----

export function TableSkeleton({ rows = 5 }: { rows?: number }) {
  return (
    <div className="animate-pulse">
      {Array.from({ length: rows }).map((_, i) => (
        <div key={i} className="flex items-center gap-4 px-4 py-3 border-b border-gray-100">
          <div className="h-4 bg-gray-200 rounded w-1/4" />
          <div className="h-4 bg-gray-200 rounded w-1/5" />
          <div className="h-4 bg-gray-200 rounded w-16" />
          <div className="h-4 bg-gray-200 rounded w-20" />
          <div className="h-4 bg-gray-200 rounded w-16 ml-auto" />
        </div>
      ))}
    </div>
  );
}

export function CardSkeleton({ count = 3 }: { count?: number }) {
  return (
    <div className="space-y-3 animate-pulse">
      {Array.from({ length: count }).map((_, i) => (
        <div key={i} className="bg-white rounded-card shadow-card p-4">
          <div className="flex items-center justify-between mb-2">
            <div className="h-4 bg-gray-200 rounded w-1/3" />
            <div className="h-5 bg-gray-200 rounded-full w-16" />
          </div>
          <div className="h-3 bg-gray-200 rounded w-1/2 mb-2" />
          <div className="h-3 bg-gray-200 rounded w-1/4" />
        </div>
      ))}
    </div>
  );
}

// ----- Dropdown component (portal-based to escape overflow:hidden) -----

export function Dropdown({ trigger, children, open, onOpenChange, align = 'right' }: {
  trigger: React.ReactNode;
  children: React.ReactNode;
  open: boolean;
  onOpenChange: (open: boolean) => void;
  align?: 'left' | 'right';
}) {
  const triggerRef = useRef<HTMLDivElement>(null);
  const menuRef = useRef<HTMLDivElement>(null);
  const [pos, setPos] = useState<{ top: number; left: number } | null>(null);

  useEffect(() => {
    if (open && triggerRef.current) {
      const rect = triggerRef.current.getBoundingClientRect();
      const menuWidth = 192;
      let left = align === 'right' ? rect.right - menuWidth : rect.left;
      left = Math.max(8, Math.min(left, window.innerWidth - menuWidth - 8));
      setPos({ top: rect.bottom + 4, left });
    }
  }, [open, align]);

  useEffect(() => {
    if (!open) return;
    const handler = (e: MouseEvent) => {
      const target = e.target as Node;
      if (
        triggerRef.current && !triggerRef.current.contains(target) &&
        menuRef.current && !menuRef.current.contains(target)
      ) {
        onOpenChange(false);
      }
    };
    document.addEventListener('mousedown', handler);
    return () => document.removeEventListener('mousedown', handler);
  }, [open, onOpenChange]);

  useEffect(() => {
    if (!open) return;
    const handler = () => onOpenChange(false);
    window.addEventListener('scroll', handler, true);
    return () => window.removeEventListener('scroll', handler, true);
  }, [open, onOpenChange]);

  return (
    <>
      <div ref={triggerRef} className="inline-block">
        <div onClick={() => onOpenChange(!open)}>{trigger}</div>
      </div>
      {open && pos && createPortal(
        <div
          ref={menuRef}
          className="fixed z-[9999] w-48 bg-white border border-secondary-light-gray rounded-btn shadow-lg py-1"
          style={{ top: pos.top, left: pos.left }}
        >
          {children}
        </div>,
        document.body
      )}
    </>
  );
}

export function DropdownItem({ onClick, children, className }: { onClick: () => void; children: React.ReactNode; className?: string }) {
  return (
    <button onClick={onClick} className={clsx('w-full text-left px-4 py-2 text-sm hover:bg-gray-50 min-h-[44px] flex items-center', className)}>
      {children}
    </button>
  );
}

// ----- Bottom Sheet (mobile) -----

export function BottomSheet({ open, onClose, title, children }: {
  open: boolean;
  onClose: () => void;
  title: string;
  children: React.ReactNode;
}) {
  if (!open) return null;
  return (
    <div className="fixed inset-0 z-50 flex items-end justify-center md:hidden" onClick={onClose}>
      <div className="fixed inset-0 bg-black/50" />
      <div
        className="relative w-full bg-white rounded-t-2xl max-h-[80vh] overflow-auto animate-slide-up"
        onClick={(e) => e.stopPropagation()}
      >
        <div className="flex items-center justify-between p-4 border-b border-gray-100 sticky top-0 bg-white z-10">
          <h3 className="font-semibold text-base">{title}</h3>
          <button onClick={onClose} className="p-2 hover:bg-gray-100 rounded-full min-h-[44px] min-w-[44px] flex items-center justify-center">
            <XMarkIcon className="w-5 h-5" />
          </button>
        </div>
        <div className="p-4">{children}</div>
      </div>
    </div>
  );
}

// ----- More Menu (per-row) -----

export function MoreMenu({ children }: { children: React.ReactNode }) {
  const [open, setOpen] = useState(false);
  return (
    <Dropdown
      open={open}
      onOpenChange={setOpen}
      trigger={
        <button className="p-2 hover:bg-gray-100 rounded-btn min-h-[44px] min-w-[44px] flex items-center justify-center">
          <EllipsisVerticalIcon className="w-5 h-5 text-gray-500" />
        </button>
      }
    >
      {children}
    </Dropdown>
  );
}

// ----- Global CSS for animations -----

export function AdminMobileStyles() {
  return (
    <style jsx global>{`
      @keyframes slide-up {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
      }
      .animate-slide-up {
        animation: slide-up 0.25s ease-out;
      }
      .scrollbar-hide {
        -ms-overflow-style: none;
        scrollbar-width: none;
      }
      .scrollbar-hide::-webkit-scrollbar {
        display: none;
      }
    `}</style>
  );
}