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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.impossibl.postgres.jdbc;

import com.impossibl.postgres.protocol.ResultField;
import com.impossibl.postgres.protocol.ResultField.Format;
import com.impossibl.postgres.types.ArrayType;
import com.impossibl.postgres.types.Registry;
import com.impossibl.postgres.types.Type;

import static com.impossibl.postgres.jdbc.ArrayUtils.getDimensions;
import static com.impossibl.postgres.jdbc.SQLTypeUtils.coerceToArray;

import java.sql.Array;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

public class PGArray implements Array {

  PGConnectionImpl connection;
  ArrayType type;
  Object[] value;

  public PGArray(PGConnectionImpl connection, ArrayType type, Object[] value) {
    super();
    this.connection = connection;
    this.type = type;
    this.value = value;
  }

  public Object[] getValue() {
    return value;
  }

  @Override
  public String getBaseTypeName() throws SQLException {
    return type.getElementType().getName();
  }

  @Override
  public int getBaseType() throws SQLException {
    return SQLTypeMetaData.getSQLType(type.getElementType());
  }

  @Override
  public Object getArray() throws SQLException {
    return getArray(connection.getTypeMap());
  }

  @Override
  public Object getArray(Map> typeMap) throws SQLException {

    Class targetType = SQLTypeUtils.mapGetType(type, typeMap, connection);

    return coerceToArray(value, type, targetType, typeMap, connection);
  }

  @Override
  public Object getArray(long index, int count) throws SQLException {
    return getArray(index, count, connection.getTypeMap());
  }

  @Override
  public Object getArray(long index, int count, Map> typeMap) throws SQLException {

    if (index < 1 || index > value.length || (index + count) > (value.length + 1)) {
      throw new SQLException("Invalid array slice");
    }

    Class targetType = SQLTypeUtils.mapGetType(type, typeMap, connection);

    return coerceToArray(value, (int) index - 1, count, type, targetType, typeMap, connection);
  }

  @Override
  public ResultSet getResultSet() throws SQLException {
    return getResultSet(connection.getTypeMap());
  }

  @Override
  public ResultSet getResultSet(Map> map) throws SQLException {
    return getResultSet(1, value.length, map);
  }

  @Override
  public ResultSet getResultSet(long index, int count) throws SQLException {
    return getResultSet(index, count, connection.getTypeMap());
  }

  @Override
  public ResultSet getResultSet(long index, int count, Map> map) throws SQLException {

    if (index < 1 || index > (value.length + 1) || (index + count) > (value.length + 1)) {
      throw new SQLException("Invalid array slice");
    }

    Registry reg = connection.getRegistry();

    Type elementType = getDimensions(value) > 1 ? type : type.getElementType();

    ResultField[] fields = {
      new ResultField("INDEX", 0, (short)0, reg.loadType("int4"), (short)0, 0, Format.Binary),
      new ResultField("VALUE", 0, (short)0, elementType, (short)0, 0, Format.Binary)
    };

    List results = new ArrayList(value.length);
    for (long c = index, end = index + count; c < end; ++c) {
      results.add(new Object[]{c, value[(int) c - 1]});
    }

    PGStatement stmt = connection.createStatement();
    stmt.closeOnCompletion();
    return stmt.createResultSet(Arrays.asList(fields), results, map);
  }

  @Override
  public void free() throws SQLException {
    connection = null;
    type = null;
    value = null;
  }

}