package bjc.utils.misc;

import java.math.BigDecimal;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import java.sql.Types;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Parent class for {@link NamedPreparedStatement}
 * 
 * Used mostly for cases where you want to prepare the bindings independently of the actual query.
 */
public class BoundPreparedStatement {
	protected final Map<String, Binder> singles = new HashMap<>();
	protected final Map<String, List<Binder>> lists = new HashMap<>();
	protected final List<ParamSnapshot> batch = new ArrayList<>();

	private static List<Binder> toBinders(Collection<?> values, int sqlType, boolean forceType) {
		ArrayList<Binder> list = new ArrayList<>(values.size());
		for (Object v : values) {
			final Object val = v;
			if (forceType) {
				list.add((ps, i) -> {
					if (val == null)
						ps.setNull(i, sqlType);
					else
						ps.setObject(i, val, sqlType);
				});
			} else {
				list.add((ps, i) -> ps.setObject(i, val));
			}
		}
		return list;
	}

	/**
	 * Record the current set of parameters as a batch and start a new one.
	 * 
	 * @return The prepared statement
	 */
	public BoundPreparedStatement addBatch() {
		batch.add(new ParamSnapshot(new HashMap<>(singles), deepCopyLists(lists)));
		return this;
	}

	/**
	 * Clear the currently bound parameters.
	 * 
	 * @return The prepared statement
	 */
	public BoundPreparedStatement clearParameters() {
		singles.clear();
		lists.clear();
		return this;
	}

	/**
	 * Bind a object as a parameter
	 * 
	 * @param name The name of the parameter
	 * @param value The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setObject(String name, Object value) {
		singles.put(name, (ps, i) -> ps.setObject(i, value));
		return this;
	}

	/**
	 * Bind a object as a parameter
	 * 
	 * @param name The name of the parameter
	 * @param value The value for the parameter
	 * @param sqlType The SQL type for the parameter (see {@link java.sql.Types})
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setObject(String name, Object value, int sqlType) {
		singles.put(name, (ps, i) -> {
			if (value == null)
				ps.setNull(i, sqlType);
			else
				ps.setObject(i, value, sqlType);
		});
		return this;
	}

	/**
	 * Bind a null as a parameter
	 * 
	 * @param name The name of the parameter
	 * @param sqlType The SQL type for the parameter (see {@link java.sql.Types})
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setNull(String name, int sqlType) {
		singles.put(name, (ps, i) -> ps.setNull(i, sqlType));
		return this;
	}

	/**
	 * Bind a boolean as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setBoolean(String n, boolean x) {
		singles.put(n, (ps, i) -> ps.setBoolean(i, x));
		return this;
	}

	/**
	 * Bind a byte as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setByte(String n, byte x) {
		singles.put(n, (ps, i) -> ps.setByte(i, x));
		return this;
	}

	/**
	 * Bind a short as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setShort(String n, short x) {
		singles.put(n, (ps, i) -> ps.setShort(i, x));
		return this;
	}

	/**
	 * Bind a int as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setInt(String n, int x) {
		singles.put(n, (ps, i) -> ps.setInt(i, x));
		return this;
	}

	/**
	 * Bind a long as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setLong(String n, long x) {
		singles.put(n, (ps, i) -> ps.setLong(i, x));
		return this;
	}

	/**
	 * Bind a float as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setFloat(String n, float x) {
		singles.put(n, (ps, i) -> ps.setFloat(i, x));
		return this;
	}

	/**
	 * Bind a double as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setDouble(String n, double x) {
		singles.put(n, (ps, i) -> ps.setDouble(i, x));
		return this;
	}

	/**
	 * Bind a {@link BigDecimal} as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setBigDecimal(String n, BigDecimal x) {
		singles.put(n, (ps, i) -> ps.setBigDecimal(i, x));
		return this;
	}

	/**
	 * Bind a string as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setString(String n, String x) {
		singles.put(n, (ps, i) -> ps.setString(i, x));
		return this;
	}

	/**
	 * Bind a byte-array as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setBytes(String n, byte[] x) {
		singles.put(n, (ps, i) -> ps.setBytes(i, x));
		return this;
	}

	/**
	 * Bind a date as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setDate(String n, Date x) {
		singles.put(n, (ps, i) -> ps.setDate(i, x));
		return this;
	}

	/**
	 * Bind a date as a parameter
	 *
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @param c The calendar for the date
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setDate(String n, Date x, Calendar c) {
		singles.put(n, (ps, i) -> ps.setDate(i, x, c));
		return this;
	}

	/**
	 * Bind a time-value as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setTime(String n, Time x) {
		singles.put(n, (ps, i) -> ps.setTime(i, x));
		return this;
	}

	/**
	 * Bind a time-value as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @param c The calendar for the time
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setTime(String n, Time x, Calendar c) {
		singles.put(n, (ps, i) -> ps.setTime(i, x, c));
		return this;
	}

	/**
	 * Bind a timestamp as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setTimestamp(String n, Timestamp x) {
		singles.put(n, (ps, i) -> ps.setTimestamp(i, x));
		return this;
	}

	/**
	 * Bind a timestamp as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @param c The calendar for the timestamp
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setTimestamp(String n, Timestamp x, Calendar c) {
		singles.put(n, (ps, i) -> ps.setTimestamp(i, x, c));
		return this;
	}

	/**
	 * Bind a {@link Array} as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setArray(String n, Array x) {
		singles.put(n, (ps, i) -> ps.setArray(i, x));
		return this;
	}

	/**
	 * Bind a {@link Blob} as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setBlob(String n, Blob x) {
		singles.put(n, (ps, i) -> ps.setBlob(i, x));
		return this;
	}

	/**
	 * Bind a {@link Clob} as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setClob(String n, Clob x) {
		singles.put(n, (ps, i) -> ps.setClob(i, x));
		return this;
	}

	/**
	 * Bind a URL as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setURL(String n, java.net.URL x) {
		singles.put(n, (ps, i) -> ps.setURL(i, x));
		return this;
	}

	/**
	 * Bind a ASCII stream as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @param len The length of the stream
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setAsciiStream(String n, java.io.InputStream x, int len) {
				singles.put(n, (ps, i) -> ps.setAsciiStream(i, x, len));
				return this;
			}

	/**
	 * Bind a binary stream as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param x The value for the parameter
	 * @param len The length of the stream
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setBinaryStream(String n, java.io.InputStream x, int len) {
				singles.put(n, (ps, i) -> ps.setBinaryStream(i, x, len));
				return this;
			}

	/**
	 * Bind a character stream as a parameter
	 * 
	 * @param n The name of the parameter
	 * @param r The value for the parameter
	 * @param len The length of the stream
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setCharacterStream(String n, java.io.Reader r, int len) {
				singles.put(n, (ps, i) -> ps.setCharacterStream(i, r, len));
				return this;
			}

	/**
	 * Bind a list parameter to the statement
	 * 
	 * @param name The name of the list parameter
	 * @param values The values for the list parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setList(String name, Collection<?> values) {
		lists.put(name, toBinders(values, Types.OTHER, false));
		return this;
	}

	/**
	 * Bind a list parameter to the statement
	 * 
	 * @param name The name of the list parameter
	 * @param values The values for the list parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setList(String name, Object... values) {
		lists.put(name, toBinders(Arrays.asList(values), Types.OTHER, false));
		return this;
	}

	/** 
	 * Explicit SQL type for all elements (useful if nulls might appear). 
	 * 
	 * @param name The name of the list parameter
	 * @param sqlType The SQL type for the parameters
	 * @param values The values for the list parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setList(String name, int sqlType, Collection<?> values) {
		lists.put(name, toBinders(values, sqlType, true));
		return this;
	}

	/** 
	 * Explicit SQL type for all elements (useful if nulls might appear). 
	 * 
	 * @param name The name of the list parameter
	 * @param sqlType The SQL type for the parameters
	 * @param values The values for the list parameter
	 * @return The prepared statement
	 */
	public BoundPreparedStatement setList(String name, int sqlType, Object... values) {
		lists.put(name, toBinders(Arrays.asList(values), sqlType, true));
		return this;
	}

	private static Map<String, List<Binder>> deepCopyLists(Map<String, List<Binder>> src) {
		Map<String, List<Binder>> m = new HashMap<>(src.size());
		for (Map.Entry<String, List<Binder>> e : src.entrySet()) {
			m.put(e.getKey(), new ArrayList<>(e.getValue()));
		}
		return m;
	}
	
	/**
	 * Create a new {@link BoundPreparedStatement}
	 */
	public BoundPreparedStatement() {
		
	}
}