package net.frontlinesms.data.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

/**
 * @author Alex Anderson <alex@frontlinesms.com>
 */
@Entity
public class FrontlineMultimediaMessagePart {
	/** Unique id for this entity.  This is for hibernate usage. */
	@Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(unique=true,nullable=false,updatable=false) @SuppressWarnings("unused")
	private long id;
	/** The content of the part, if text, or the name of the file where the data is stored. */
	@Column(length=4096) // arbitrary size that is bigger than people are likely to type on a handset
	private String content;
	/** 
	 * <code>true</code> if {@link #content} links to the binary file name; <code>false</code> if {@link #content} contains the text content of this part 
	 * NB: On MySQL, "binary" is a restricted keyword and can't be used.
	 * */
	@Column(name="binaryData")
	private boolean binary;
	
	FrontlineMultimediaMessagePart() {}
	
	public FrontlineMultimediaMessagePart(boolean binary, String content) {
		this.binary = binary;
		this.content = content;
	}
	
	public String getFilename() {
		if(!isBinary()) throw new IllegalStateException("Should not be calling this method on a text part.");
		return this.content;
	}
	public void setFilename(String filename) {
		if(!isBinary()) throw new IllegalStateException("Should not be calling this method on a text part.");
		this.content = filename;
	}
	
	public String getTextContent() {
		if(isBinary()) throw new IllegalStateException("Should not be calling this method on a binary part.");
		return this.content;
	}
	
	public boolean isBinary() {
		return this.binary;
	}
	
	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof FrontlineMultimediaMessagePart)) {
			return false;
		}
		FrontlineMultimediaMessagePart part = (FrontlineMultimediaMessagePart) obj;
		if (this.binary) {
			return part.isBinary() && this.getFilename().equals(part.getFilename());
		} else {
			return !part.isBinary() && this.getTextContent().equals(part.getTextContent());
		}
	}

//> FACTORY METHODS
	public static FrontlineMultimediaMessagePart createTextPart(String textContent) {
		return new FrontlineMultimediaMessagePart(false, textContent);
	}
	public static FrontlineMultimediaMessagePart createBinaryPart(String filename) {
		return new FrontlineMultimediaMessagePart(true, filename);
	}

	public String toString(boolean truncate) {
		if (isBinary()) {
			return "File: " + getFilename();
		} else {
			String trim = getTextContent().trim();
			if (!trim.isEmpty()) {
				if (truncate && trim.length() > 20) {
					return "\"" + trim.substring(0, 19) + "...\"";
				} else {
					return "\"" + trim + "\"";
				}
			} else {
				return "";
			}
		}
	}
}