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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 hivemall.factorization.fm;

import it.unimi.dsi.fastutil.ints.Int2FloatMap;
import it.unimi.dsi.fastutil.ints.Int2FloatOpenHashMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;

import java.util.Arrays;

import javax.annotation.Nonnull;

import org.apache.hadoop.hive.ql.metadata.HiveException;

public final class FMIntFeatureMapModel extends FactorizationMachineModel {
    private static final int DEFAULT_MAPSIZE = 4096;

    // LEARNING PARAMS
    private float _w0;
    @Nonnull
    private final Int2FloatMap _w;
    @Nonnull
    private final Int2ObjectMap _V;

    private int _minIndex, _maxIndex;

    public FMIntFeatureMapModel(@Nonnull FMHyperParameters params) {
        super(params);
        this._w0 = 0.f;
        this._w = new Int2FloatOpenHashMap(DEFAULT_MAPSIZE);
        _w.defaultReturnValue(0.f);
        this._V = new Int2ObjectOpenHashMap(DEFAULT_MAPSIZE);
        this._minIndex = 0;
        this._maxIndex = 0;
    }

    @Override
    public int getSize() {
        return _w.size();
    }

    @Override
    protected int getMinIndex() {
        return _minIndex;
    }

    @Override
    protected int getMaxIndex() {
        return _maxIndex;
    }

    @Override
    public float getW0() {
        return _w0;
    }

    @Override
    protected void setW0(float nextW0) {
        this._w0 = nextW0;
    }

    @Override
    protected float getW(final int i) {
        assert (i >= 1) : i;
        return _w.get(i);
    }

    @Override
    public float getW(@Nonnull final Feature x) {
        final int i = x.getFeatureIndex();
        if (i == 0) {
            return _w0;
        } else {
            assert (i >= 1) : i;
            return _w.get(i);
        }
    }

    @Override
    protected void setW(@Nonnull Feature x, float nextWi) {
        final int i = x.getFeatureIndex();
        if (i == 0) {
            this._w0 = nextWi;
        } else {
            assert (i >= 1) : i;
            _w.put(i, nextWi);
        }
    }

    @Override
    protected float[] getV(int i, boolean init) {
        assert (i >= 1) : i;
        return _V.get(i);
    }

    @Override
    public float getV(@Nonnull final Feature x, final int f) {
        int i = x.getFeatureIndex();
        assert (i >= 1) : i;
        final float[] Vi = _V.get(i);
        if (Vi == null) {
            return 0.f;
        }
        return Vi[f];
    }

    @Override
    protected void setV(@Nonnull Feature x, int f, float nextVif) {
        final int i = x.getFeatureIndex();
        assert (i >= 1) : i;
        float[] vi = _V.get(i);
        assert (vi != null) : "V[" + i + "] was null";
        vi[f] = nextVif;
    }

    @Override
    public void check(@Nonnull final Feature[] x) throws HiveException {
        for (Feature e : x) {
            if (e == null) {
                continue;
            }
            final int idx = e.getFeatureIndex();
            if (idx < 1) {
                throw new HiveException(
                    "Index of x should be greater than or equals to 1: " + Arrays.toString(x));
            }
            if (!_w.containsKey(idx)) {
                _w.put(idx, 0.f);
            }
            if (!_V.containsKey(idx)) {
                float[] tmp = initV();
                _V.put(idx, tmp);
            }
            this._maxIndex = Math.max(_maxIndex, idx);
            this._minIndex = Math.min(_minIndex, idx);
        }
    }
}