import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class Book {
    public static final String CLASS_NAME = Book.class.getName();

    public static final String TAG_NAME_ASIN = "Asin";

    public static final String TAG_NAME_TITLE = "Title";

    public static final String TAG_NAME_AUTHOR = "Author";

    public static final String TAG_NAME_PRICE = "Price";

    public static final String TAG_NAME_PAGE = "Page";

    private String asin = null;

    private String title = null;

    private String author = null;

    private Integer price = null;

    private List<Page> pageList = null;

    // default
    public Book() {
        this.pageList = new ArrayList<Page>();
    }

    // field parameters
    public Book(String asin, String title, String author, Integer price, List<Page> pageList) {
        this.asin = asin;
        this.title = title;
        this.author = author;
        this.price = new Integer(price);
        this.pageList = new ArrayList<Page>(pageList);
    }

    // element
    public Book(Element element) throws Exception {
        // asin
        NodeList nodeListAsin = element.getElementsByTagName(TAG_NAME_ASIN);
        for (int i = 0; i < nodeListAsin.getLength(); i++) {
            Element elementAsin = (Element)nodeListAsin.item(i);
            this.asin = elementAsin.getFirstChild().getNodeValue();
        }
        // title
        NodeList nodeListTitle = element.getElementsByTagName(TAG_NAME_TITLE);
        for (int i = 0; i < nodeListTitle.getLength(); i++) {
            Element elementTitle = (Element)nodeListTitle.item(i);
            this.title = elementTitle.getFirstChild().getNodeValue();
        }
        // author
        NodeList nodeListAuthor = element.getElementsByTagName(TAG_NAME_AUTHOR);
        for (int i = 0; i < nodeListAuthor.getLength(); i++) {
            Element elementAuthor = (Element)nodeListAuthor.item(i);
            this.author = elementAuthor.getFirstChild().getNodeValue();
        }
        // price
        NodeList nodeListPrice = element.getElementsByTagName(TAG_NAME_PRICE);
        for (int i = 0; i < nodeListPrice.getLength(); i++) {
            Element elementPrice = (Element)nodeListPrice.item(i);
            try {
                if (!StringUtil.isEmpty(elementPrice.getFirstChild().getNodeValue())) {
                    this.price = new Integer(elementPrice.getFirstChild().getNodeValue());
                }
            } catch (NumberFormatException e) {
                throw new Exception("failed to parse <price>.");
            }
        }
        // pageList
        NodeList nodeListPage = element.getElementsByTagName(TAG_NAME_PAGE);
        this.pageList = new ArrayList<Page>();
        for (int i = 0; i < nodeListPage.getLength(); i++) {
            this.pageList.add(new Page((Element)nodeListPage.item(i)));
        }
    }

    // xml file name
    public Book(String xmlName) throws Exception {
        try {
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document document = documentBuilder.parse(new File(xmlName));
            Element root = document.getDocumentElement();
            // root name check
            if (!CLASS_NAME.equals(root.getTagName())) {
                throw new Exception("root name error.");
            }
            // asin
            NodeList nodeListAsin = root.getElementsByTagName(TAG_NAME_ASIN);
            for (int i = 0; i < nodeListAsin.getLength(); i++) {
                Element elementAsin = (Element)nodeListAsin.item(i);
                this.asin = elementAsin.getFirstChild().getNodeValue();
            }
            // title
            NodeList nodeListTitle = root.getElementsByTagName(TAG_NAME_TITLE);
            for (int i = 0; i < nodeListTitle.getLength(); i++) {
                Element elementTitle = (Element)nodeListTitle.item(i);
                this.title = elementTitle.getFirstChild().getNodeValue();
            }
            // author
            NodeList nodeListAuthor = root.getElementsByTagName(TAG_NAME_AUTHOR);
            for (int i = 0; i < nodeListAuthor.getLength(); i++) {
                Element elementAuthor = (Element)nodeListAuthor.item(i);
                this.author = elementAuthor.getFirstChild().getNodeValue();
            }
            // price
            NodeList nodeListPrice = root.getElementsByTagName(TAG_NAME_PRICE);
            for (int i = 0; i < nodeListPrice.getLength(); i++) {
                Element elementPrice = (Element)nodeListPrice.item(i);
                try {
                    if (!StringUtil.isEmpty(elementPrice.getFirstChild().getNodeValue())) {
                        this.price = new Integer(elementPrice.getFirstChild().getNodeValue());
                    }
                } catch (NumberFormatException e) {
                    throw new Exception("failed to parse <price>.");
                }
            }
            // pageList
            NodeList nodeListPage = root.getElementsByTagName(TAG_NAME_PAGE);
            this.pageList = new ArrayList<Page>();
            for (int i = 0; i < nodeListPage.getLength(); i++) {
                this.pageList.add(new Page((Element)nodeListPage.item(i)));
            }
        } catch (Exception e) {
            throw e;
        }
    }

    public void setAsin(String asin) {
        this.asin = asin;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public void setPrice(Integer price) {
        this.price = new Integer(price);
    }

    public void setPageList(List<Page> pageList) {
        this.pageList = new ArrayList<Page>(pageList);
    }

    public String getAsin() {
        return this.asin;
    }

    public String getTitle() {
        return this.title;
    }

    public String getAuthor() {
        return this.author;
    }

    public Integer getPrice() {
        return this.price;
    }

    public List<Page> getPageList() {
        return this.pageList;
    }

    public String toString() {
        return "[asin=" + this.asin + ", title=" + this.title + ", author=" + this.author + ", price=" + this.price + ", pageList="
                + this.pageList + "]";
    }
}