package org.postgresql.core;

import java.util.Hashtable;
import java.sql.SQLException;

/**
 * This class parses raw error and notice messages from the V3 Protocol into
 * the various fields they may contain.  More information on these fields is
 * containted in the main PostgreSQL documentation under Internals,
 * Frontend/Backend Protocol, Error and Notice Message Fields.
 *
 * The different fields are separated by an embedded null (0) byte.  I'm not
 * sure how this will handle messages in encodings that allow embedded nulls.
 * 
 */

class PGErrorMessage {

	private String severity;
	private String sqlState;
	private String message;
	private String detail;
	private String hint;
	private String position;
	private String where;
	private String file;
	private String line;
	private String routine;

	public PGErrorMessage(byte rawMessage[], Encoding encoding) throws SQLException {
		Hashtable fields = split(rawMessage,encoding);
		severity = (String)fields.get("S");
		sqlState = (String)fields.get("C");
		message = (String)fields.get("M");
		detail = (String)fields.get("D");
		hint = (String)fields.get("H");
		position = (String)fields.get("P");
		where = (String)fields.get("W");
		file = (String)fields.get("F");
		line = (String)fields.get("L");
		routine = (String)fields.get("R");
	}

	public String getSeverity() {
		return severity;
	}

	public String getSQLState() {
		return sqlState;
	}

	public String getMessage() {
		return message;
	}

	public String getDetail() {
		return detail;
	}

	public String getHint() {
		return hint;
	}

	public String getPosition() {
		return position;
	}

	public String getWhere() {
		return where;
	}

	public String getFile() {
		return file;
	}

	public String getLine() {
		return line;
	}

	public String getRoutine() {
		return routine;
	}

	/**
	 * Split the fields in the raw message into their label and content.
	 */
	private static Hashtable split(byte message[], Encoding encoding) throws SQLException {
		Hashtable fields = new Hashtable();
		int start = 0;
		for (int i=0; i<message.length; i++) {
			if (message[i] == 0 && i>start) {
				byte label[] = new byte[1];
				byte content[] = new byte[i-start-1];
				label[0] = message[start];
				for (int j=start+1; j<i; j++) {
					content[j-start-1] = message[j];
				}
				fields.put(encoding.decode(label),encoding.decode(content));
				start = i+1;
			}
		}
		return fields;
	}

	public String toString() {
		StringBuffer sb = new StringBuffer();
		String eol = System.getProperty("line.separator");

		sb.append("Severity: ");
		sb.append(severity);
		sb.append(eol);

		sb.append("SQLState: ");
		sb.append(sqlState);
		sb.append(eol);

		sb.append("Message: ");
		sb.append(message);
		sb.append(eol);
		
		sb.append("Detail: ");
		sb.append(detail);
		sb.append(eol);
		
		sb.append("Hint: ");
		sb.append(hint);
		sb.append(eol);

		sb.append("Position: ");
		sb.append(position);
		sb.append(eol);

		sb.append("Where: ");
		sb.append(where);
		sb.append(eol);

		sb.append("File: ");
		sb.append(file);
		sb.append(eol);

		sb.append("Line: ");
		sb.append(line);
		sb.append(eol);

		sb.append("Routine: ");
		sb.append(routine);

		return sb.toString();
	}
}