package it.cavallium.strangedb.database;

import it.cavallium.strangedb.annotations.DbDataType;
import it.cavallium.strangedb.annotations.DbPrimitiveType;
import it.unimi.dsi.fastutil.longs.LongList;
import it.cavallium.strangedb.EnhancedObjectUpgrader;

import java.io.IOException;
import java.util.function.Supplier;

public class DatabaseEnhancedObjectUpgrader implements EnhancedObjectUpgrader {
	private final DatabaseObjectsIO objectsIO;
	private final long[] fieldRefs;
	private final long[] methodRefs;
	private final long primitiveDataRef;

	public DatabaseEnhancedObjectUpgrader(DatabaseObjectsIO objectsIO, long[] fieldRefs, long[] methodRefs, long primitiveDataRef) {
		this.objectsIO = objectsIO;
		this.fieldRefs = fieldRefs;
		this.methodRefs = methodRefs;
		this.primitiveDataRef = primitiveDataRef;
	}

	@Override
	@SuppressWarnings("unchecked")
	public Object getField(int id, DbDataType type, Supplier<Class<?>> enhancedClassType) throws IOException {
		return objectsIO.loadData(type, fieldRefs[id], enhancedClassType);
	}

	@Override
	@SuppressWarnings("unchecked")
	public Object getMethod(int id, DbDataType type, Supplier<Class<?>> enhancedClassType) throws IOException {
		return objectsIO.loadData(type, methodRefs[id], enhancedClassType);
	}

	@SuppressWarnings("unchecked")
	@Override
	public <T> T getPrimitiveField(int id, DbPrimitiveType type) throws IOException {
		LongList data = objectsIO.loadPrimitiveData(primitiveDataRef);
		switch (type) {
			case BOOLEAN:
				return (T) ((Object) (data.getLong(id) % 2 == 1));
			case BYTE:
				return (T) ((Object) ((byte) data.getLong(id)));
			case SHORT:
				return (T) ((Object) ((short) data.getLong(id)));
			case CHAR:
				return (T) ((Object) ((char) data.getLong(id)));
			case INTEGER:
				return (T) ((Object) ((int) data.getLong(id)));
			case LONG:
				return (T) ((Object) ((long) data.getLong(id)));
			case FLOAT:
				return (T) ((Object) ((float) Float.intBitsToFloat((int) data.getLong(id))));
			case DOUBLE:
				return (T) ((Object) ((double) Double.longBitsToDouble(data.getLong(id))));
			default:
				throw new IOException("Type " + type + " not implemented");
		}
	}
}