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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 org.apache.paimon.spark;

import org.apache.paimon.data.BinaryString;
import org.apache.paimon.data.InternalArray;
import org.apache.paimon.data.InternalMap;
import org.apache.paimon.data.InternalRow;
import org.apache.paimon.data.Timestamp;
import org.apache.paimon.types.ArrayType;
import org.apache.paimon.types.BigIntType;
import org.apache.paimon.types.DataType;
import org.apache.paimon.types.DataTypeChecks;
import org.apache.paimon.types.IntType;
import org.apache.paimon.types.MapType;
import org.apache.paimon.types.MultisetType;
import org.apache.paimon.types.RowType;

import org.apache.spark.sql.catalyst.util.ArrayBasedMapData;
import org.apache.spark.sql.catalyst.util.ArrayData;
import org.apache.spark.sql.catalyst.util.DateTimeUtils;
import org.apache.spark.sql.catalyst.util.MapData;
import org.apache.spark.sql.types.BinaryType;
import org.apache.spark.sql.types.BooleanType;
import org.apache.spark.sql.types.ByteType;
import org.apache.spark.sql.types.CalendarIntervalType;
import org.apache.spark.sql.types.DateType;
import org.apache.spark.sql.types.Decimal;
import org.apache.spark.sql.types.DecimalType;
import org.apache.spark.sql.types.DoubleType;
import org.apache.spark.sql.types.FloatType;
import org.apache.spark.sql.types.IntegerType;
import org.apache.spark.sql.types.LongType;
import org.apache.spark.sql.types.NullType;
import org.apache.spark.sql.types.ShortType;
import org.apache.spark.sql.types.StringType;
import org.apache.spark.sql.types.StructType;
import org.apache.spark.sql.types.TimestampType;
import org.apache.spark.sql.types.UserDefinedType;
import org.apache.spark.unsafe.types.CalendarInterval;
import org.apache.spark.unsafe.types.UTF8String;

import static org.apache.paimon.utils.InternalRowUtils.copyInternalRow;

/** Spark {@link org.apache.spark.sql.catalyst.InternalRow} to wrap {@link InternalRow}. */
public class SparkInternalRow extends org.apache.spark.sql.catalyst.InternalRow {

    private final RowType rowType;

    private InternalRow row;

    public SparkInternalRow(RowType rowType) {
        this.rowType = rowType;
    }

    public SparkInternalRow replace(InternalRow row) {
        this.row = row;
        return this;
    }

    @Override
    public int numFields() {
        return row.getFieldCount();
    }

    @Override
    public void setNullAt(int i) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void update(int i, Object value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public org.apache.spark.sql.catalyst.InternalRow copy() {
        return new SparkInternalRow(rowType).replace(copyInternalRow(row, rowType));
    }

    @Override
    public boolean isNullAt(int ordinal) {
        return row.isNullAt(ordinal);
    }

    @Override
    public boolean getBoolean(int ordinal) {
        return row.getBoolean(ordinal);
    }

    @Override
    public byte getByte(int ordinal) {
        return row.getByte(ordinal);
    }

    @Override
    public short getShort(int ordinal) {
        return row.getShort(ordinal);
    }

    @Override
    public int getInt(int ordinal) {
        return row.getInt(ordinal);
    }

    @Override
    public long getLong(int ordinal) {
        if (rowType.getTypeAt(ordinal) instanceof BigIntType) {
            return row.getLong(ordinal);
        }

        return getTimestampMicros(ordinal);
    }

    private long getTimestampMicros(int ordinal) {
        DataType type = rowType.getTypeAt(ordinal);
        return fromPaimon(row.getTimestamp(ordinal, DataTypeChecks.getPrecision(type)));
    }

    @Override
    public float getFloat(int ordinal) {
        return row.getFloat(ordinal);
    }

    @Override
    public double getDouble(int ordinal) {
        return row.getDouble(ordinal);
    }

    @Override
    public Decimal getDecimal(int ordinal, int precision, int scale) {
        org.apache.paimon.data.Decimal decimal = row.getDecimal(ordinal, precision, scale);
        return fromPaimon(decimal);
    }

    @Override
    public UTF8String getUTF8String(int ordinal) {
        return fromPaimon(row.getString(ordinal));
    }

    @Override
    public byte[] getBinary(int ordinal) {
        return row.getBinary(ordinal);
    }

    @Override
    public CalendarInterval getInterval(int ordinal) {
        throw new UnsupportedOperationException();
    }

    @Override
    public org.apache.spark.sql.catalyst.InternalRow getStruct(int ordinal, int numFields) {
        return fromPaimon(row.getRow(ordinal, numFields), (RowType) rowType.getTypeAt(ordinal));
    }

    @Override
    public ArrayData getArray(int ordinal) {
        return fromPaimon(row.getArray(ordinal), (ArrayType) rowType.getTypeAt(ordinal));
    }

    @Override
    public MapData getMap(int ordinal) {
        return fromPaimon(row.getMap(ordinal), rowType.getTypeAt(ordinal));
    }

    @Override
    public Object get(int ordinal, org.apache.spark.sql.types.DataType dataType) {
        if (isNullAt(ordinal) || dataType instanceof NullType) {
            return null;
        }
        if (dataType instanceof BooleanType) {
            return getBoolean(ordinal);
        }
        if (dataType instanceof ByteType) {
            return getByte(ordinal);
        }
        if (dataType instanceof ShortType) {
            return getShort(ordinal);
        }
        if (dataType instanceof IntegerType) {
            return getInt(ordinal);
        }
        if (dataType instanceof LongType) {
            return getLong(ordinal);
        }
        if (dataType instanceof FloatType) {
            return getFloat(ordinal);
        }
        if (dataType instanceof DoubleType) {
            return getDouble(ordinal);
        }
        if (dataType instanceof StringType) {
            return getUTF8String(ordinal);
        }
        if (dataType instanceof DecimalType) {
            DecimalType dt = (DecimalType) dataType;
            return getDecimal(ordinal, dt.precision(), dt.scale());
        }
        if (dataType instanceof DateType) {
            return getInt(ordinal);
        }
        if (dataType instanceof TimestampType) {
            return getLong(ordinal);
        }
        if (dataType instanceof CalendarIntervalType) {
            return getInterval(ordinal);
        }
        if (dataType instanceof BinaryType) {
            return getBinary(ordinal);
        }
        if (dataType instanceof StructType) {
            return getStruct(ordinal, ((StructType) dataType).size());
        }
        if (dataType instanceof org.apache.spark.sql.types.ArrayType) {
            return getArray(ordinal);
        }
        if (dataType instanceof org.apache.spark.sql.types.MapType) {
            return getMap(ordinal);
        }
        if (dataType instanceof UserDefinedType) {
            return get(ordinal, ((UserDefinedType) dataType).sqlType());
        }

        throw new UnsupportedOperationException("Unsupported data type " + dataType.simpleString());
    }

    public static Object fromPaimon(Object o, DataType type) {
        if (o == null) {
            return null;
        }
        switch (type.getTypeRoot()) {
            case TIMESTAMP_WITHOUT_TIME_ZONE:
            case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
                return fromPaimon((Timestamp) o);
            case CHAR:
            case VARCHAR:
                return fromPaimon((BinaryString) o);
            case DECIMAL:
                return fromPaimon((org.apache.paimon.data.Decimal) o);
            case ARRAY:
                return fromPaimon((InternalArray) o, (ArrayType) type);
            case MAP:
            case MULTISET:
                return fromPaimon((InternalMap) o, type);
            case ROW:
                return fromPaimon((InternalRow) o, (RowType) type);
            default:
                return o;
        }
    }

    public static UTF8String fromPaimon(BinaryString string) {
        return UTF8String.fromBytes(string.toBytes());
    }

    public static Decimal fromPaimon(org.apache.paimon.data.Decimal decimal) {
        return Decimal.apply(decimal.toBigDecimal());
    }

    public static org.apache.spark.sql.catalyst.InternalRow fromPaimon(
            InternalRow row, RowType rowType) {
        return new SparkInternalRow(rowType).replace(row);
    }

    public static long fromPaimon(Timestamp timestamp) {
        return DateTimeUtils.fromJavaTimestamp(timestamp.toSQLTimestamp());
    }

    public static ArrayData fromPaimon(InternalArray array, ArrayType arrayType) {
        return fromPaimonArrayElementType(array, arrayType.getElementType());
    }

    private static ArrayData fromPaimonArrayElementType(InternalArray array, DataType elementType) {
        return new SparkArrayData(elementType).replace(array);
    }

    public static MapData fromPaimon(InternalMap map, DataType mapType) {
        DataType keyType;
        DataType valueType;
        if (mapType instanceof MapType) {
            keyType = ((MapType) mapType).getKeyType();
            valueType = ((MapType) mapType).getValueType();
        } else if (mapType instanceof MultisetType) {
            keyType = ((MultisetType) mapType).getElementType();
            valueType = new IntType();
        } else {
            throw new UnsupportedOperationException("Unsupported type: " + mapType);
        }

        return new ArrayBasedMapData(
                fromPaimonArrayElementType(map.keyArray(), keyType),
                fromPaimonArrayElementType(map.valueArray(), valueType));
    }
}