// 기본 문서 요소 인터페이스
public interface DocumentElement {
    void accept(DocumentVisitor visitor);
}

// 구체적인 문서 요소들
@Getter
@AllArgsConstructor
public class TextElement implements DocumentElement {
    private String content;
    private String fontStyle;
    private int fontSize;

    @Override
    public void accept(DocumentVisitor visitor) {
        visitor.visitText(this);
    }
}

@Getter
@AllArgsConstructor
public class ImageElement implements DocumentElement {
    private String source;
    private int width;
    private int height;
    private String altText;

    @Override
    public void accept(DocumentVisitor visitor) {
        visitor.visitImage(this);
    }
}

@Getter
@AllArgsConstructor
public class TableElement implements DocumentElement {
    private List<List<String>> data;
    private List<String> headers;
    private String borderStyle;

    @Override
    public void accept(DocumentVisitor visitor) {
        visitor.visitTable(this);
    }
}

// 방문자 인터페이스
public interface DocumentVisitor {
    void visitText(TextElement text);
    void visitImage(ImageElement image);
    void visitTable(TableElement table);
}

// HTML 변환 방문자
public class HtmlExportVisitor implements DocumentVisitor {
    private StringBuilder html = new StringBuilder();

    @Override
    public void visitText(TextElement text) {
        html.append(String.format(
            "<p style='font-family: %s; font-size: %dpx;'>%s</p>",
            text.getFontStyle(),
            text.getFontSize(),
            text.getContent()
        ));
    }

    @Override
    public void visitImage(ImageElement image) {
        html.append(String.format(
            "<img src='%s' width='%d' height='%d' alt='%s' />",
            image.getSource(),
            image.getWidth(),
            image.getHeight(),
            image.getAltText()
        ));
    }

    @Override
    public void visitTable(TableElement table) {
        html.append("<table border='1'>\n");
        
        // 헤더 추가
        if (!table.getHeaders().isEmpty()) {
            html.append("  <tr>\n");
            for (String header : table.getHeaders()) {
                html.append("    <th>").append(header).append("</th>\n");
            }
            html.append("  </tr>\n");
        }

        // 데이터 행 추가
        for (List<String> row : table.getData()) {
            html.append("  <tr>\n");
            for (String cell : row) {
                html.append("    <td>").append(cell).append("</td>\n");
            }
            html.append("  </tr>\n");
        }
        
        html.append("</table>");
    }

    public String getHtml() {
        return html.toString();
    }
}

// Markdown 변환 방문자
public class MarkdownExportVisitor implements DocumentVisitor {
    private StringBuilder markdown = new StringBuilder();

    @Override
    public void visitText(TextElement text) {
        markdown.append(text.getContent()).append("\n\n");
    }

    @Override
    public void visitImage(ImageElement image) {
        markdown.append(String.format(
            "![%s](%s)\n",
            image.getAltText(),
            image.getSource()
        ));
    }

    @Override
    public void visitTable(TableElement table) {
        // 헤더 추가
        if (!table.getHeaders().isEmpty()) {
            markdown.append("|");
            for (String header : table.getHeaders()) {
                markdown.append(header).append("|");
            }
            markdown.append("\n|");
            
            // 구분선 추가
            for (int i = 0; i < table.getHeaders().size(); i++) {
                markdown.append("---|");
            }
            markdown.append("\n");
        }

        // 데이터 행 추가
        for (List<String> row : table.getData()) {
            markdown.append("|");
            for (String cell : row) {
                markdown.append(cell).append("|");
            }
            markdown.append("\n");
        }
        markdown.append("\n");
    }

    public String getMarkdown() {
        return markdown.toString();
    }
}

public class DocumentConverter {
    public static void main(String[] args) {
        // 문서 요소 생성
        List<DocumentElement> document = new ArrayList<>();
        
        document.add(new TextElement(
            "안녕하세요, 방문자 패턴 예제입니다.",
            "Arial",
            16
        ));

        document.add(new ImageElement(
            "/images/example.jpg",
            800,
            600,
            "예제 이미지"
        ));

        List<String> headers = Arrays.asList("이름", "나이", "직업");
        List<List<String>> data = Arrays.asList(
            Arrays.asList("홍길동", "30", "개발자"),
            Arrays.asList("김철수", "25", "디자이너")
        );
        document.add(new TableElement(data, headers, "solid"));

        // HTML 변환
        HtmlExportVisitor htmlVisitor = new HtmlExportVisitor();
        for (DocumentElement element : document) {
            element.accept(htmlVisitor);
        }
        System.out.println("HTML 출력:");
        System.out.println(htmlVisitor.getHtml());

        // Markdown 변환
        MarkdownExportVisitor markdownVisitor = new MarkdownExportVisitor();
        for (DocumentElement element : document) {
            element.accept(markdownVisitor);
        }
        System.out.println("\nMarkdown 출력:");
        System.out.println(markdownVisitor.getMarkdown());
    }
}