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package com.datastax.data.dataset.provider.sql;

import com.datastax.data.dataset.DataColumn;
import com.datastax.data.dataset.DataRow;

import java.sql.PreparedStatement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;


public class TableCommand extends SQLCommand {
    
    private static final Logger LOG = Logger.getLogger(TableCommand.class.getName());
    
    
    private String tableName;
    
    private String whereClause = "";
    
    private String orderByClause = "";
    
    private String havingClause = "";
    
    
    public TableCommand() {
        this(null, null);
    }
    
    public TableCommand(String tableName) {
        this(tableName, null);
    }
    
    public TableCommand(String tableName, String whereClause) {
        setTableName(tableName);
        setWhereClause(whereClause);
    }
    
    
    public void setTableName(String tableName) {
        if (this.tableName != tableName) {
            String oldValue = this.tableName;
            this.tableName = tableName;
            firePropertyChange("tableName", oldValue, tableName);
        }
    }
    
    
    public void setWhereClause(String clause) {
        if (whereClause != clause) {
            String oldValue = this.whereClause;
            whereClause = clause == null ? "" : clause;
            firePropertyChange("whereClause", oldValue, whereClause);
        }
    }
    
    public void setOrderByClause(String clause) {
        if (orderByClause != clause) {
            String oldValue = this.orderByClause;
            orderByClause = clause == null ? "" : clause;
            firePropertyChange("orderByClause", oldValue, orderByClause);
        }
    }
    
    public void setHavingClause(String clause) {
        if (havingClause != clause) {
            String oldValue = this.havingClause;
            havingClause = clause == null ? "" : clause;
            firePropertyChange("havingClause", oldValue, havingClause);
        }
    }
    































    public String[] getParameterNames() {
	List strings = new ArrayList();
	if (getSelectSQL() !=  null) {
	    strings.add(getSelectSQL());
	} else {
	    strings.add(whereClause);
	    strings.add(orderByClause);
	    strings.add(havingClause);
	}
	if (getUpdateSQL() != null) {
	    strings.add(getUpdateSQL());
	}
	if (getDeleteSQL() != null) {
	    strings.add(getDeleteSQL());
	}
	if (getInsertSQL() != null) {
	    strings.add(getInsertSQL());
	}
	return super.getParameterNames(strings.toArray(new String[strings.size()]));
    }

    protected PreparedStatement getSelectStatement(JDBCDataConnection conn) throws Exception {
        if (tableName == null) {
            
            throw new Exception("TableCommand not configured with a table name");
        }

	
	if (super.getSelectSQL() != null) {
	    return super.getSelectStatement(conn);
	}
	
	String sql = "";
        try {
            
            
            StringBuilder buffer = new StringBuilder();
            buffer.append("select * from ");
            buffer.append("\"").append(tableName).append("\"");
            buffer.append(" ");
            buffer.append(whereClause);
            buffer.append(" ");
            buffer.append(orderByClause);
            buffer.append(" ");
            buffer.append(havingClause);
            sql = buffer.toString().trim();
            LOG.log(Level.FINE, "Generated Select SQL: " + sql);
            return createPreparedStatement(sql, conn);
        } catch (Exception e) {
	    LOG.log(Level.WARNING, "Problem with creating select SQL statement {0}", sql);
	    LOG.log(Level.WARNING, e.getMessage(), e);
            return null;
        }
    }

    protected PreparedStatement getUpdateStatement(JDBCDataConnection conn, DataRow row) throws Exception {
        if (tableName == null) {
            
            throw new Exception("TableCommand not configured with a table name");
        }

	
	if (super.getUpdateSQL() != null) {
	    return super.getUpdateStatement(conn, row);
	}
	
	String sql = "";
        try {
            Map values = new HashMap();
            
            
            StringBuilder buffer = new StringBuilder();
            buffer.append("update ");
            buffer.append("\"").append(tableName).append("\"");
            buffer.append(" set ");
            
            
            List columns = getUpdateableColumns(row.getTable().getColumns());
            int modCount = 0;
            for (int i=0; i values = new HashMap();
            StringBuilder buffer = new StringBuilder();
            buffer.append("insert into ");
            buffer.append("\"").append(tableName).append("\"");
            buffer.append("(");
            List cols = getUpdateableColumns(row.getTable().getColumns());
            for (DataColumn col : cols) {
                buffer.append("\"").append(col.getName()).append("\"");
                buffer.append(", ");
            }
            buffer.replace(buffer.length()-2, buffer.length(), ")");
            buffer.append(" values(");
            for (DataColumn col : cols) {
                buffer.append(":" + col.getName() + ", ");
                values.put(col.getName(), row.getValue(col));
            }
            buffer.replace(buffer.length()-2, buffer.length(), ")");
            sql = buffer.toString().trim();
            LOG.log(Level.FINE, "Generated Insert SQL: " + sql);
            return super.prepareStatement(sql, values, conn);
        } catch (Exception e) {
	    LOG.log(Level.WARNING, "Problem with creating insert SQL statement {0}", sql);
	    LOG.log(Level.WARNING, e.getMessage(), e);
            return null;
        }
    }

    protected PreparedStatement getDeleteStatement(JDBCDataConnection conn, DataRow row) throws Exception {
        if (tableName == null) {
            
            throw new Exception("TableCommand not configured with a table name");
        }

	
	if (super.getDeleteSQL() != null) {
	    return super.getDeleteStatement(conn, row);
	}
	
	String sql = "";
        try {
            Map values = new HashMap();
            StringBuilder buffer = new StringBuilder();
            buffer.append("delete from ");
            buffer.append("\"").append(tableName).append("\"");
            buffer.append(" where ");
            int keyColCount = 0;
            List columns = row.getTable().getColumns();
            for (int i=0; i getUpdateableColumns(List cols) {
        List results = new ArrayList();
        for (DataColumn col : cols) {
            if (col.getExpression() == null || col.getExpression().equals("")) {
                results.add(col);
            }
        }
        return results;
    }
}