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/*
 * Copyright (c) 2010-2021 Haifeng Li. All rights reserved.
 *
 * Smile is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Smile 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Smile.  If not, see .
 */

package smile.data.vector;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Collections;
import java.util.List;

import smile.data.measure.CategoricalMeasure;
import smile.data.measure.NominalScale;
import smile.data.type.DataTypes;
import smile.data.type.StructField;

/**
 * An immutable string vector.
 *
 * @author Haifeng Li
 */
class StringVectorImpl extends VectorImpl implements StringVector {

    /** Constructor. */
    public StringVectorImpl(String name, String[] vector) {
        super(name, String.class, vector);
    }

    /** Constructor. */
    public StringVectorImpl(StructField field, String[] vector) {
        super(field.name, field.type, vector);

        if (field.measure != null) {
            throw new IllegalArgumentException(String.format("Invalid measure %s for %s", field.measure, type()));
        }
    }

    @Override
    public StringVector get(int... index) {
        String[] v = new String[index.length];
        for (int i = 0; i < index.length; i++) v[i] = get(index[i]);
        return new StringVectorImpl(field(), v);
    }

    @Override
    public Vector toDate() {
        return toDate(DateTimeFormatter.ISO_LOCAL_DATE);
    }

    @Override
    public Vector toDate(DateTimeFormatter format) {
        LocalDate[] dates = stream().map(format::parse).map(LocalDate::from).toArray(LocalDate[]::new);
        return new VectorImpl<>(name(), DataTypes.DateType, dates);
    }

    @Override
    public Vector toTime() {
        return toTime(DateTimeFormatter.ISO_LOCAL_TIME);
    }

    @Override
    public Vector toTime(DateTimeFormatter format) {
        LocalTime[] dates = stream().map(format::parse).map(LocalTime::from).toArray(LocalTime[]::new);
        return new VectorImpl<>(name(), DataTypes.TimeType, dates);
    }

    @Override
    public Vector toDateTime() {
        return toDateTime(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
    }

    @Override
    public Vector toDateTime(DateTimeFormatter format) {
        LocalDateTime[] dates = stream().map(format::parse).map(LocalDateTime::from).toArray(LocalDateTime[]::new);
        return new VectorImpl<>(name(), DataTypes.DateTimeType, dates);
    }

    @Override
    public NominalScale nominal() {
        List levels = distinct();
        Collections.sort(levels);
        return new NominalScale(levels);
    }

    @Override
    public BaseVector factorize(CategoricalMeasure scale) {
        switch (scale.type().id()) {
            case Byte: {
                byte[] data = new byte[size()];
                for (int i = 0; i < data.length; i++) {
                    String s = get(i);
                    data[i] = s == null ? (byte) -1 : scale.valueOf(s).byteValue();
                }

                return new ByteVectorImpl(new StructField(name(), DataTypes.ByteType, scale), data);
            }
            case Short: {
                short[] data = new short[size()];
                for (int i = 0; i < data.length; i++) {
                    String s = get(i);
                    data[i] = s == null ? (short) -1 : scale.valueOf(s).shortValue();
                }

                return new ShortVectorImpl(new StructField(name(), DataTypes.ShortType, scale), data);
            }
            case Integer: {
                int[] data = new int[size()];
                for (int i = 0; i < data.length; i++) {
                    String s = get(i);
                    data[i] = s == null ? -1 : scale.valueOf(s).intValue();
                }

                return new IntVectorImpl(new StructField(name(), DataTypes.IntegerType, scale), data);
            }
            default:
                // we should never reach here.
                throw new UnsupportedOperationException("Unsupported data type for nominal measure: " + scale.type());
        }
    }
}