import type { ButtonHTMLAttributes, ReactNode } from 'react';
import { cn } from '../../lib/cn';

export type ButtonVariant = 'primary' | 'navy' | 'secondary' | 'ghost' | 'danger';
export type ButtonSize = 'sm' | 'md' | 'lg';

export interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  /** Visual style. @default "primary" */
  variant?: ButtonVariant;
  /** @default "md" */
  size?: ButtonSize;
  iconLeft?: ReactNode;
  iconRight?: ReactNode;
  /** Stretch to container width. @default false */
  full?: boolean;
}

const SIZES: Record<ButtonSize, string> = {
  sm: 'h-[34px] px-3.5 text-[13px] rounded-sm',
  md: 'h-[42px] px-[18px] text-base rounded-md',
  lg: 'h-[50px] px-6 text-md rounded-md',
};

const VARIANTS: Record<ButtonVariant, string> = {
  primary: 'bg-sunrise text-white border border-transparent shadow-sunrise',
  navy: 'bg-navy-900 text-on-navy border border-transparent shadow-sm',
  secondary: 'bg-card text-strong border border-border-default shadow-xs',
  ghost: 'bg-transparent text-body border border-transparent',
  danger: 'bg-ruby-600 text-white border border-transparent shadow-sm',
};

/**
 * Aria primary action button. Sunrise gradient for primary,
 * solid navy for secondary, quiet ghost for tertiary.
 */
export function Button({
  children,
  variant = 'primary',
  size = 'md',
  iconLeft,
  iconRight,
  full = false,
  className,
  ...rest
}: ButtonProps) {
  return (
    <button
      className={cn(
        'inline-flex items-center justify-center gap-2 font-sans font-semibold leading-none',
        'cursor-pointer transition-[transform,filter,box-shadow] duration-150',
        'hover:brightness-[0.98] active:scale-[0.97]',
        'disabled:opacity-50 disabled:cursor-not-allowed disabled:active:scale-100',
        SIZES[size],
        VARIANTS[variant],
        full ? 'w-full' : 'w-auto',
        className,
      )}
      {...rest}
    >
      {iconLeft}
      {children}
      {iconRight}
    </button>
  );
}