package dao;

import com.sun.rowset.CachedRowSetImpl;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.sql.rowset.CachedRowSet;
import javax.swing.table.TableModel;
import model.Criterion;
import model.CriterionEditor;
import model.Student;
import ui.CriterionPanel;

/**
 *
 * @author mark
 */
public class ResultDAO {

	private static final Logger logger = Logger.getLogger(ResultDAO.class.getName());

	private static Map<String, CriterionEditor> criteria = new HashMap<>();

	public void addEditor(Criterion criterion, CriterionPanel criterionEditor) {
		criteria.put(criterion.getCriterion(), criterionEditor);
	}

	public Boolean isComplete() {
		for (CriterionEditor editor : criteria.values()) {
			if (!editor.isComplete()) {
				return Boolean.FALSE;
			}
		}

		return Boolean.TRUE;
	}

	public void save(String student) {

		try {

			try (
					Connection con = JdbcConnection.getConnection();
					PreparedStatement stmt = con.prepareStatement("merge into result (student, criterion, result, comment) values (?,?,?,?)")) {

				for (Map.Entry<String, CriterionEditor> entry : criteria.entrySet()) {
					CriterionEditor editor = entry.getValue();

					if (!editor.isComplete()) {
						continue;
					}

					String criterion = entry.getKey();
					Double result = editor.getResult();
					String comment = editor.getComment();

					stmt.setString(1, student);
					stmt.setString(2, criterion);
					stmt.setDouble(3, result);
					stmt.setString(4, comment);

					stmt.addBatch();
				}

				stmt.executeBatch();

				clear();
			}

		} catch (SQLException e) {
			logger.log(Level.SEVERE, e.getLocalizedMessage(), e);
		}

	}

	public void load(String student) {

		try {

			try (
					Connection con = JdbcConnection.getConnection();
					PreparedStatement stmt = con.prepareStatement("select * from result where student = ?")) {

				stmt.setString(1, student);

				ResultSet rs = stmt.executeQuery();

				while (rs.next()) {

					String criterion = rs.getString("criterion");
					Double result = rs.getDouble("result");
					String comment = rs.getString("comment");

					CriterionEditor editor = criteria.get(criterion);

					editor.setResult(result);
					editor.setComment(comment);
				}

			}

		} catch (SQLException e) {
			logger.log(Level.SEVERE, e.getLocalizedMessage(), e);
		}

	}

	public TableModel getSubmissions() {
		try (
				Connection con = JdbcConnection.getConnection();
				Statement stmt = con.createStatement()) {

			ResultSet rs = stmt.executeQuery("select * from allmarks order by \"Student\"");

			CachedRowSet crs = new CachedRowSetImpl();
			crs.populate(rs);

			return new RowSetTableModel(crs);


		} catch (SQLException ex) {
			logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
		}
		return null;
	}

	public Collection<Map<String, ?>> getResult(String student) {
		String sql = "SELECT * FROM report where usercode = ?";

		Collection<Map<String, ?>> data = new ArrayList<>();

		try (
				Connection con = JdbcConnection.getConnection();
				PreparedStatement s = con.prepareStatement(sql);) {

			s.setString(1, student);

			ResultSet rs = s.executeQuery();

			while (rs.next()) {
				Map<String, Object> result = new HashMap<>();

				ResultSetMetaData metaData = rs.getMetaData();

				int columnCount = metaData.getColumnCount();

				for (int i = 1; i <= columnCount; i++) {
					String columnName = metaData.getColumnName(i);
					Object value = rs.getObject(columnName);
					if (value instanceof Number) {
						value = new BigDecimal(String.valueOf(value));
					}
					result.put(columnName, value);
				}

				data.add(result);
			}

			return data;

		} catch (SQLException ex) {
			logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
			return null;
		}
	}

	public Student findStudentById(Integer id) {


		try (
				Connection con = JdbcConnection.getConnection();
				PreparedStatement stmt = con.prepareStatement("select * from students where studentid = ?")) {

			stmt.setInt(1, id);

			ResultSet rs = stmt.executeQuery();

			if (rs.next()) {
				Student s = new Student();

				s.setId(id);
				s.setName(rs.getString("name"));
				s.setUserName(rs.getString("usercode"));
				s.setEmail(rs.getString("email"));

				return s;
			}

		} catch (SQLException ex) {
			logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
		}

		return null;

	}

	public Student findStudentByUserCode(String  userCode) {


		try (
				Connection con = JdbcConnection.getConnection();
				PreparedStatement stmt = con.prepareStatement("select * from students where usercode = ?")) {

			stmt.setString(1, userCode);

			ResultSet rs = stmt.executeQuery();

			if (rs.next()) {
				Student s = new Student();

				s.setId(rs.getInt("studentid"));
				s.setUserName(rs.getString("usercode"));
				s.setName(rs.getString("name"));
				s.setEmail(rs.getString("email"));

				return s;
			}

		} catch (SQLException ex) {
			logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
		}

		return null;

	}	
	
	private void clear() {
		criteria = new HashMap<>();
	}

}