/*
 * ToroDB
 * Copyright © 2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.d2r;

import com.torodb.core.TableRef;
import com.torodb.core.transaction.metainf.*;
import com.torodb.d2r.MockedDocPartResult.MockedRow;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class MetaDocPartBuilder {

  private ImmutableMetaDocPart.Builder builder;
  private List<Object> both = new ArrayList<>();
  private MetaDocPart metaDocPart;
  private boolean metaDocPartBuilded = false;
  private List<MockedRow> rows = new ArrayList<>();

  public MetaDocPartBuilder(TableRef tableRef) {
    builder = new ImmutableMetaDocPart.Builder(tableRef, tableRef.getName());
  }

  public void addMetaField(String name, String identifier, FieldType type) {
    ImmutableMetaField metaField = new ImmutableMetaField(name, identifier, type);
    builder.put(metaField);
    both.add(metaField);
  }

  public void addMetaScalar(String identifier, FieldType type) {
    ImmutableMetaScalar mestaScalar = new ImmutableMetaScalar(identifier, type);
    builder.put(mestaScalar);
    both.add(mestaScalar);
  }

  private void buildMetaDocPart() {
    if (!metaDocPartBuilded) {
      metaDocPart = builder.build();
      metaDocPartBuilded = true;
    }
  }

  public MockedRow addRow(Integer did, Integer pid, Integer rid, Integer seq, Object... values) {
    buildMetaDocPart();
    Object[] copy = new Object[values.length];
    for (int i = 0; i < values.length; i++) {
      int idx = findOrder(both.get(i));
      copy[idx] = values[i];
    }
    MockedRow row = new MockedRow(did, pid, rid, seq, copy);
    rows.add(row);
    return row;
  }

  public MockedDocPartResult getResultSet() {
    buildMetaDocPart();
    return new MockedDocPartResult(metaDocPart, rows);
  }

  private int findOrder(Object field) {
    int idx = 0;
    Iterator<? extends MetaScalar> itScalar = metaDocPart.streamScalars().iterator();
    while (itScalar.hasNext()) {
      MetaScalar next = itScalar.next();
      if (next == field) {
        return idx;
      }
      idx++;
    }
    Iterator<? extends MetaField> it = metaDocPart.streamFields().iterator();
    while (it.hasNext()) {
      MetaField next = it.next();
      if (next == field) {
        return idx;
      }
      idx++;
    }
    throw new RuntimeException("Field not found");
  }

}