import type { ButtonHTMLAttributes, HTMLAttributes, ReactNode } from 'react';

import { PlatformFieldLabel } from './PlatformFieldLabel';

type PlatformSubpanelStaticElement = 'section' | 'div' | 'article' | 'aside';
type PlatformSubpanelElement = PlatformSubpanelStaticElement | 'button';
type PlatformSubpanelPadding =
  | 'tight'
  | 'row'
  | 'xs'
  | 'sm'
  | 'md'
  | 'lg'
  | 'none';
type PlatformSubpanelRadius = 'xs' | 'sm' | 'md' | 'lg' | 'xl';
type PlatformSubpanelSurface =
  | 'platform'
  | 'flat'
  | 'soft'
  | 'dark'
  | 'darkSky'
  | 'darkEmerald'
  | 'darkAmber'
  | 'darkRose'
  | 'danger';
type PlatformSubpanelTitleVariant = 'section' | 'strong';

type PlatformSubpanelBaseProps = {
  as?: PlatformSubpanelElement;
  title?: ReactNode;
  titleVariant?: PlatformSubpanelTitleVariant;
  actions?: ReactNode;
  children: ReactNode;
  interactive?: boolean;
  padding?: PlatformSubpanelPadding;
  radius?: PlatformSubpanelRadius;
  surface?: PlatformSubpanelSurface;
  className?: string;
  headerClassName?: string;
  titleClassName?: string;
  actionsClassName?: string;
  bodyClassName?: string;
};

type PlatformSubpanelStaticProps = PlatformSubpanelBaseProps &
  Omit<HTMLAttributes<HTMLElement>, 'children' | 'className' | 'title'> & {
    as?: PlatformSubpanelStaticElement;
  };

type PlatformSubpanelButtonProps = PlatformSubpanelBaseProps &
  Omit<ButtonHTMLAttributes<HTMLButtonElement>, 'children' | 'title'> & {
    as: 'button';
  };

type PlatformSubpanelProps =
  | PlatformSubpanelStaticProps
  | PlatformSubpanelButtonProps;

const PLATFORM_SUBPANEL_PADDING_CLASS: Record<PlatformSubpanelPadding, string> =
  {
    tight: 'p-2',
    row: 'px-3 py-2',
    xs: 'px-3 py-2.5',
    sm: 'p-3',
    md: 'p-4',
    lg: 'p-4 sm:p-5',
    none: 'p-0',
  };

const PLATFORM_SUBPANEL_RADIUS_CLASS: Record<PlatformSubpanelRadius, string> = {
  xs: 'rounded-xl',
  sm: 'rounded-[1rem]',
  md: 'rounded-[1.25rem]',
  lg: 'rounded-[1.35rem]',
  xl: 'rounded-[1.5rem]',
};

const PLATFORM_SUBPANEL_SURFACE_CLASS: Record<PlatformSubpanelSurface, string> =
  {
    platform: 'platform-subpanel',
    flat: 'border border-[var(--platform-subpanel-border)] bg-white/72',
    soft: 'border border-[var(--platform-subpanel-border)] bg-white/68',
    dark: 'border border-white/10 bg-black/25 text-zinc-100',
    darkSky: 'border border-sky-400/18 bg-sky-500/8 text-sky-50',
    darkEmerald:
      'border border-emerald-400/18 bg-emerald-500/8 text-emerald-100/85',
    darkAmber: 'border border-amber-300/18 bg-amber-500/8 text-amber-50',
    darkRose: 'border border-rose-300/18 bg-rose-500/8 text-rose-50',
    danger:
      'border border-[var(--platform-button-danger-border)] bg-[var(--platform-button-danger-fill)]',
  };

const PLATFORM_SUBPANEL_INTERACTIVE_CLASS =
  'text-left transition hover:bg-white focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[var(--platform-warm-border)] disabled:cursor-not-allowed disabled:opacity-55';

function renderSubpanelTitle({
  title,
  titleClassName,
  titleVariant,
}: {
  title: ReactNode;
  titleClassName?: string;
  titleVariant: PlatformSubpanelTitleVariant;
}) {
  if (titleVariant === 'strong') {
    return (
      <div
        className={[
          'text-sm font-black text-[var(--platform-text-strong)]',
          titleClassName,
        ]
          .filter(Boolean)
          .join(' ')}
      >
        {title}
      </div>
    );
  }

  return (
    <PlatformFieldLabel variant="section" className={titleClassName}>
      {title}
    </PlatformFieldLabel>
  );
}

/**
 * 平台白底子面板。
 * 统一承接结果页和创作工作台里的 subpanel 外壳、标题行和右侧动作区。
 */
export function PlatformSubpanel({
  as: Component = 'section',
  title,
  titleVariant = 'section',
  actions,
  children,
  interactive = false,
  padding = 'md',
  radius = 'md',
  surface = 'platform',
  className,
  headerClassName,
  titleClassName,
  actionsClassName,
  bodyClassName,
  ...elementProps
}: PlatformSubpanelProps) {
  const hasHeader = Boolean(title) || Boolean(actions);
  const subpanelClassName = [
    PLATFORM_SUBPANEL_SURFACE_CLASS[surface],
    PLATFORM_SUBPANEL_RADIUS_CLASS[radius],
    PLATFORM_SUBPANEL_PADDING_CLASS[padding],
    interactive ? PLATFORM_SUBPANEL_INTERACTIVE_CLASS : null,
    className,
  ]
    .filter(Boolean)
    .join(' ');
  const content = (
    <>
      {hasHeader ? (
        <div
          className={[
            'flex items-center justify-between gap-3',
            headerClassName,
          ]
            .filter(Boolean)
            .join(' ')}
        >
          <div className="min-w-0">
            {title
              ? renderSubpanelTitle({
                  title,
                  titleClassName,
                  titleVariant,
                })
              : null}
          </div>
          {actions ? (
            <div
              className={['flex shrink-0 items-center gap-2', actionsClassName]
                .filter(Boolean)
                .join(' ')}
            >
              {actions}
            </div>
          ) : null}
        </div>
      ) : null}

      {bodyClassName ? (
        <div className={bodyClassName}>{children}</div>
      ) : (
        children
      )}
    </>
  );

  if (Component === 'button') {
    const { type = 'button', ...buttonProps } = elementProps as Omit<
      ButtonHTMLAttributes<HTMLButtonElement>,
      'children' | 'title'
    >;

    return (
      <button {...buttonProps} type={type} className={subpanelClassName}>
        {content}
      </button>
    );
  }

  const StaticComponent = Component;
  const staticProps = elementProps as Omit<
    HTMLAttributes<HTMLElement>,
    'children' | 'className' | 'title'
  >;

  return (
    <StaticComponent {...staticProps} className={subpanelClassName}>
      {content}
    </StaticComponent>
  );
}