import React, { useEffect, useRef } from 'react';
import { clsx } from 'clsx';
import { X } from 'lucide-react';
import Button from './Button';

export interface SheetProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  children: React.ReactNode;
  side?: 'left' | 'right' | 'top' | 'bottom';
  size?: 'sm' | 'md' | 'lg' | 'xl' | 'full';
  className?: string;
}

const sideClasses = {
  left: 'left-0 top-0 bottom-0',
  right: 'right-0 top-0 bottom-0',
  top: 'top-0 left-0 right-0',
  bottom: 'bottom-0 left-0 right-0',
};

const sizeClasses = {
  sm: 'w-80',
  md: 'w-96',
  lg: 'w-[32rem]',
  xl: 'w-[42rem]',
  full: 'w-full',
};

const slideAnimations = {
  left: 'animate-in slide-in-from-left duration-300',
  right: 'animate-in slide-in-from-right duration-300',
  top: 'animate-in slide-in-from-top duration-300',
  bottom: 'animate-in slide-in-from-bottom duration-300',
};

/**
 * Sheet/Drawer component - side panel
 */
export const Sheet = ({
  open,
  onOpenChange,
  children,
  side = 'right',
  size = 'md',
  className,
}: SheetProps) => {
  const sheetRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (open) {
      document.body.style.overflow = 'hidden';
    } else {
      document.body.style.overflow = '';
    }

    return () => {
      document.body.style.overflow = '';
    };
  }, [open]);

  useEffect(() => {
    const handleEscape = (e: KeyboardEvent) => {
      if (e.key === 'Escape' && open) {
        onOpenChange(false);
      }
    };

    if (open) {
      document.addEventListener('keydown', handleEscape);
      // Focus trap
      const focusableElements = sheetRef.current?.querySelectorAll(
        'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
      );
      const firstElement = focusableElements?.[0] as HTMLElement;
      firstElement?.focus();
    }

    return () => {
      document.removeEventListener('keydown', handleEscape);
    };
  }, [open, onOpenChange]);

  if (!open) return null;

  return (
    <>
      {/* Backdrop */}
      <div
        className="fixed inset-0 z-50 bg-black/50 backdrop-blur-sm"
        onClick={() => onOpenChange(false)}
        aria-hidden="true"
      />

      {/* Sheet */}
      <div
        ref={sheetRef}
        className={clsx(
          'fixed z-50',
          'bg-background border shadow-lg',
          'flex flex-col',
          sideClasses[side],
          size === 'full' ? 'h-full' : sizeClasses[size],
          slideAnimations[side],
          className
        )}
        role="dialog"
        aria-modal="true"
      >
        {children}
      </div>
    </>
  );
};

export interface SheetHeaderProps extends React.HTMLAttributes<HTMLDivElement> {
  children: React.ReactNode;
}

export const SheetHeader = ({ children, className, ...props }: SheetHeaderProps) => {
  return (
    <div className={clsx('flex flex-col space-y-1.5 p-6 pb-4 border-b', className)} {...props}>
      {children}
    </div>
  );
};

export interface SheetTitleProps extends React.HTMLAttributes<HTMLHeadingElement> {
  children: React.ReactNode;
}

export const SheetTitle = ({ children, className, ...props }: SheetTitleProps) => {
  return (
    <h2 className={clsx('text-lg font-semibold leading-none tracking-tight', className)} {...props}>
      {children}
    </h2>
  );
};

export interface SheetDescriptionProps extends React.HTMLAttributes<HTMLParagraphElement> {
  children: React.ReactNode;
}

export const SheetDescription = ({ children, className, ...props }: SheetDescriptionProps) => {
  return (
    <p className={clsx('text-sm text-muted-foreground', className)} {...props}>
      {children}
    </p>
  );
};

export interface SheetContentProps extends React.HTMLAttributes<HTMLDivElement> {
  children: React.ReactNode;
}

export const SheetContent = ({ children, className, ...props }: SheetContentProps) => {
  return (
    <div className={clsx('flex-1 overflow-y-auto p-6', className)} {...props}>
      {children}
    </div>
  );
};

export interface SheetFooterProps extends React.HTMLAttributes<HTMLDivElement> {
  children: React.ReactNode;
}

export const SheetFooter = ({ children, className, ...props }: SheetFooterProps) => {
  return (
    <div
      className={clsx('flex items-center justify-end gap-3 p-6 pt-4 border-t', className)}
      {...props}
    >
      {children}
    </div>
  );
};

export interface SheetCloseProps {
  onClose: () => void;
  className?: string;
}

export const SheetClose = ({ onClose, className }: SheetCloseProps) => {
  return (
    <Button
      type="button"
      variant="ghost"
      size="sm"
      onClick={onClose}
      className={clsx('absolute right-4 top-4', className)}
      aria-label="Close"
    >
      <X className="h-4 w-4" />
    </Button>
  );
};