import { FileText } from 'lucide-react';

import type { PlatformTheme } from '../../../packages/shared/src/contracts/runtime';
import type {
  LegalDocument,
  LegalDocumentBlock,
} from './legalDocuments';
import { PlatformActionButton } from './PlatformActionButton';
import { UnifiedModal } from './UnifiedModal';

type LegalDocumentModalProps = {
  document: LegalDocument | null;
  open: boolean;
  platformTheme?: PlatformTheme;
  zIndexClassName?: string;
  onClose: () => void;
};

function LegalRichText({ text }: { text: string }) {
  const parts = text.split(/(\*\*[^*]+\*\*)/gu);

  return (
    <>
      {parts.map((part, index) => {
        const boldMatch = /^\*\*([^*]+)\*\*$/u.exec(part);
        if (boldMatch) {
          return (
            <strong
              key={`${index}:${part}`}
              className="font-black text-[var(--platform-text-strong)]"
            >
              {boldMatch[1]}
            </strong>
          );
        }

        return part;
      })}
    </>
  );
}

function LegalDocumentBodyBlock({
  block,
}: {
  block: LegalDocumentBlock;
}) {
  if (block.type === 'heading') {
    const className =
      block.level === 2
        ? 'mt-5 text-base font-black leading-7 text-[var(--platform-text-strong)] first:mt-0'
        : 'mt-4 text-sm font-black leading-6 text-[var(--platform-text-strong)] first:mt-0';

    return <div className={className}>{block.text}</div>;
  }

  if (block.type === 'list') {
    return (
      <ul className="mt-3 list-disc space-y-2 pl-5 text-sm leading-7 text-[var(--platform-text-base)]">
        {block.items.map((item, index) => (
          <li key={`${index}:${item}`}>
            <LegalRichText text={item} />
          </li>
        ))}
      </ul>
    );
  }

  return (
    <p className="mt-3 whitespace-pre-line text-sm leading-7 text-[var(--platform-text-base)]">
      <LegalRichText text={block.text} />
    </p>
  );
}

export function LegalDocumentModal({
  document,
  open,
  platformTheme,
  zIndexClassName,
  onClose,
}: LegalDocumentModalProps) {
  return (
    <UnifiedModal
      open={open && Boolean(document)}
      title={document?.title ?? '法律信息'}
      onClose={onClose}
      size="md"
      closeLabel="关闭法律信息"
      zIndexClassName={zIndexClassName ?? 'z-[150]'}
      overlayClassName={`platform-theme ${
        platformTheme ? `platform-theme--${platformTheme}` : ''
      }`}
      panelClassName="platform-remap-surface rounded-t-[1.4rem] sm:rounded-[1.4rem]"
      headerClassName="items-center"
      bodyClassName="px-4 py-0 sm:px-5"
      footerClassName="justify-stretch sm:justify-end"
      footer={
        <PlatformActionButton
          onClick={onClose}
          tone="secondary"
          fullWidth
          className="min-h-0 rounded-[0.9rem] sm:w-auto"
        >
          我知道了
        </PlatformActionButton>
      }
    >
      <div className="max-h-[min(64vh,34rem)] overflow-y-auto py-4 pr-1">
        <div className="mb-4 flex items-center gap-2 text-[var(--platform-cool-text)]">
          <FileText className="h-4 w-4" />
          <span className="text-xs font-black tracking-[0.2em]">
            LEGAL
          </span>
        </div>
        {document?.blocks.map((block, index) => (
          <LegalDocumentBodyBlock
            // 中文注释：法律文本没有稳定段落 id，用序号只限定在静态文档渲染列表内。
            key={`${block.type}:${index}`}
            block={block}
          />
        ))}
      </div>
    </UnifiedModal>
  );
}