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/*
 * Copyright 2003-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.sql;

import groovy.lang.Closure;
import groovy.lang.GroovyRuntimeException;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.CodeVisitorSupport;
import org.codehaus.groovy.ast.stmt.Statement;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;

/**
 * Represents an extent of objects
 *
 * @author Chris Stevenson
 * @author Paul King
 * @author James Strachan
 * @version $Revision: 10922 $
 */
public class DataSet extends Sql {

    private Closure where;
    private Closure sort;
    private boolean reversed = false;
    private DataSet parent;
    private String table;
    private SqlWhereVisitor visitor;
    private SqlOrderByVisitor sortVisitor;
    private String sql;
    private List params;

    public DataSet(Sql sql, Class type) {
        super(sql);
        String table = type.getName();
        int idx = table.lastIndexOf('.');
        if (idx > 0) {
            table = table.substring(idx + 1);
        }
        this.table = table.toLowerCase();
    }

    public DataSet(Sql sql, String table) {
        super(sql);
        this.table = table;
    }

    private DataSet(DataSet parent, Closure where) {
        super(parent);
        this.table = parent.table;
        this.parent = parent;
        this.where = where;
    }

    private DataSet(DataSet parent, Closure where, Closure sort) {
        super(parent);
        this.table = parent.table;
        this.parent = parent;
        this.where = where;
        this.sort = sort;
    }

    private DataSet(DataSet parent) {
        super(parent);
        this.table = parent.table;
        this.parent = parent;
        this.reversed = true;
    }

    public void add(Map values) throws SQLException {
        StringBuffer buffer = new StringBuffer("insert into ");
        buffer.append(table);
        buffer.append(" (");
        StringBuffer paramBuffer = new StringBuffer();
        boolean first = true;
        for (Iterator iter = values.entrySet().iterator(); iter.hasNext();) {
            Map.Entry entry = (Map.Entry) iter.next();
            String column = entry.getKey().toString();
            if (first) {
                first = false;
                paramBuffer.append("?");
            } else {
                buffer.append(", ");
                paramBuffer.append(", ?");
            }
            buffer.append(column);
        }
        buffer.append(") values (");
        buffer.append(paramBuffer.toString());
        buffer.append(")");

        Connection connection = createConnection();
        PreparedStatement statement = null;
        try {
            statement = connection.prepareStatement(buffer.toString());
            int i = 1;
            for (Iterator iter = values.entrySet().iterator(); iter.hasNext();) {
                Map.Entry entry = (Map.Entry) iter.next();
                setObject(statement, i++, entry.getValue());
            }
            int answer = statement.executeUpdate();
            if (answer != 1) {
                log.log(Level.WARNING, "Should have updated 1 row not " + answer + " when trying to add: " + values);
            }
        }
        catch (SQLException e) {
            log.log(Level.WARNING, "Failed to add row for: " + values, e);
            throw e;
        }
        finally {
            closeResources(connection, statement);
        }
    }

    public DataSet findAll(Closure where) {
        return new DataSet(this, where);
    }

    public DataSet sort(Closure sort) {
        return new DataSet(this, null, sort);
    }

    public DataSet reverse() {
        if (sort == null) {
            throw new GroovyRuntimeException("reverse() only allowed immediately after a sort()");
        }
        return new DataSet(this);
    }

    public void each(Closure closure) throws SQLException {
        eachRow(getSql(), getParameters(), closure);
    }

    private String getSqlWhere() {
        String whereClaus = "";
        String parentClaus = "";
        if (parent != null) {
            parentClaus = parent.getSqlWhere();
        }
        if (where != null) {
            whereClaus += getSqlWhereVisitor().getWhere();
        }
        if (parentClaus.length() == 0) return whereClaus;
        if (whereClaus.length() == 0) return parentClaus;
        return parentClaus + " and " + whereClaus;
    }

    private String getSqlOrderBy() {
        String sortByClaus = "";
        String parentClaus = "";
        if (parent != null) {
            parentClaus = parent.getSqlOrderBy();
        }
        if (reversed) {
            if (parentClaus.length() > 0) parentClaus += " DESC";
        }
        if (sort != null) {
            sortByClaus += getSqlOrderByVisitor().getOrderBy();
        }
        if (parentClaus.length() == 0) return sortByClaus;
        if (sortByClaus.length() == 0) return parentClaus;
        return parentClaus + ", " + sortByClaus;
    }

    public String getSql() {
        if (sql == null) {
            sql = "select * from " + table;
            String whereClaus = getSqlWhere();
            if (whereClaus.length() > 0) {
                sql += " where " + whereClaus;
            }
            String orerByClaus = getSqlOrderBy();
            if (orerByClaus.length() > 0) {
                sql += " order by " + orerByClaus;
            }
        }
        return sql;
    }

    public List getParameters() {
        if (params == null) {
            params = new ArrayList();
            if (parent != null) {
                params.addAll(parent.getParameters());
            }
            params.addAll(getSqlWhereVisitor().getParameters());
        }
        return params;
    }

    protected SqlWhereVisitor getSqlWhereVisitor() {
        if (visitor == null) {
            visitor = new SqlWhereVisitor();
            visit(where, visitor);
        }
        return visitor;
    }

    protected SqlOrderByVisitor getSqlOrderByVisitor() {
        if (sortVisitor == null) {
            sortVisitor = new SqlOrderByVisitor();
            visit(sort, sortVisitor);
        }
        return sortVisitor;
    }

    private void visit(Closure closure, CodeVisitorSupport visitor) {
        if (closure != null) {
            ClassNode classNode = closure.getMetaClass().getClassNode();
            if (classNode == null) {
                throw new GroovyRuntimeException(
                        "Could not find the ClassNode for MetaClass: " + closure.getMetaClass());
            }
            List methods = classNode.getDeclaredMethods("doCall");
            if (!methods.isEmpty()) {
                MethodNode method = (MethodNode) methods.get(0);
                if (method != null) {
                    Statement statement = method.getCode();
                    if (statement != null) {
                        statement.visit(visitor);
                    }
                }
            }
        }
    }

    /*
    * create a subset of the original dataset
    */
    public DataSet createView(Closure criteria) {
        return new DataSet(this, criteria);
    }

    /**
     * Returns a List of all of the rows from the table a DataSet
     * represents
     *
     * @return Returns a list of GroovyRowResult objects from the dataset
     * @throws SQLException if a database error occurs
     */
    public List rows() throws SQLException {
        return rows(getSql(), getParameters());
    }

    /**
     * Returns the first row from a DataSet's underlying table
     *
     * @return Returns the first GroovyRowResult object from the dataset
     * @throws SQLException if a database error occurs
     */
    public Object firstRow() throws SQLException {
        List rows = rows();
        if (rows.isEmpty()) return null;
        return (rows.get(0));
    }
}