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package org.simpleflatmapper.jooq;

import org.jooq.Configuration;
import org.jooq.DSLContext;
import org.jooq.Field;
import org.jooq.RecordType;
import org.jooq.RecordUnmapper;
import org.jooq.RecordUnmapperProvider;
import org.jooq.impl.DSL;
import org.simpleflatmapper.map.ContextualSourceMapper;
import org.simpleflatmapper.map.MapperConfig;
import org.simpleflatmapper.map.SourceMapper;
import org.simpleflatmapper.reflect.ReflectionService;
import org.simpleflatmapper.util.Function;

import java.lang.reflect.Type;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Integration point with jooq.
 * Provide a JooqRecordMapper backed by an Sfm {@link org.jooq.Record} {@link SourceMapper}
 */
public class SfmRecordUnmapperProvider implements RecordUnmapperProvider {

	private final ConcurrentMap mapperCache = new ConcurrentHashMap();
	private final Function> mapperConfigFactory;
	private final ReflectionService reflectionService;
	private final DSLContextProvider dslContextProvider;


	@Deprecated
	/**
	 * please use SfmRecorMapperProviderFactory.
	 */
	public SfmRecordUnmapperProvider(
			Function> mapperConfigFactory, ReflectionService reflectionService, final Configuration configuration) {
		this(mapperConfigFactory, reflectionService, new DSLContextProvider() {
			@Override
			public DSLContext provide() {
				return DSL.using(configuration);
			}
		});
	}
	@Deprecated
	/**
	 * please use SfmRecorMapperProviderFactory.
	 */
	public SfmRecordUnmapperProvider(
			Function> mapperConfigFactory, ReflectionService reflectionService, DSLContextProvider dslContextProvider) {
		this.mapperConfigFactory = mapperConfigFactory;
		this.reflectionService = reflectionService;
		this.dslContextProvider = dslContextProvider;
	}

	@Override
	public  RecordUnmapper provide(Class type, RecordType recordType) {

		TargetColumnsMapperKey key = getMapperKey(recordType, type);

		ContextualSourceMapper mapper = mapperCache.get(key);

		if (mapper == null) {
			MapperConfig mapperConfig = mapperConfigFactory.apply(type);

			RecordUnmapperBuilder mapperBuilder =
					new RecordUnmapperBuilder(
							reflectionService.getClassMeta(type),
							mapperConfig, dslContextProvider);

			mapperBuilder.setFields(recordType.fields());

			mapper = mapperBuilder.mapper();

			mapperCache.putIfAbsent(key, mapper);
		}
		
		return new JooqRecordUnmapperWrapper(mapper);
	}

	private  TargetColumnsMapperKey getMapperKey(RecordType recordType, Class type) {
		String[] columns = new String[recordType.size()];
		int i = 0;
		for(Field field : recordType.fields()) {
			columns[i++] = field.getName();
		}
		
		return new TargetColumnsMapperKey(type, columns);
	}
}