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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * Licensed 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 br.com.objectos.way.sql.compiler;

import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.collect.Sets.newHashSet;

import java.lang.annotation.Annotation;
import java.util.List;
import java.util.Map;
import java.util.Set;

import br.com.objectos.way.code.AbstractAnnotationProcessor;
import br.com.objectos.way.code.CodeCanvasArtifact;
import br.com.objectos.way.code.MethodInfo;
import br.com.objectos.way.code.MethodInfoHasAnnotation;
import br.com.objectos.way.code.SimpleTypeInfo;
import br.com.objectos.way.code.TypeInfo;
import br.com.objectos.way.core.util.WayIterables;
import br.com.objectos.way.sql.TableInfo;
import br.com.objectos.way.sql.annotation.Defines;
import br.com.objectos.way.sql.annotation.SqlModule;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;

/**
 * @author [email protected] (Marcio Endo)
 */
public class SqlModuleProcessor extends AbstractAnnotationProcessor {

  private final Map instanceMap = Maps.newHashMap();

  @Override
  protected Class annotationType() {
    return SqlModule.class;
  }

  @Override
  protected boolean shouldProcessMethods() {
    return false;
  }

  @Override
  protected boolean shouldProcessTypes() {
    return true;
  }

  @Override
  protected List toArtifactList(TypeInfo typeInfo) {
    List definesMethodList = newArrayList();
    Set schemaNameSet = newHashSet();

    typeInfo.getMethodInfoIterable()
        .filter(MethodInfoHasAnnotation.get(Defines.class))
        .transform(new MethodInfoToDefinesMethod(typeInfo))
        .toList()
        .appendTo(definesMethodList)
        .transform(new DefinesMethodToSchemaName())
        .appendTo(schemaNameSet);

    if (schemaNameSet.size() > 1) {
      typeInfo.compilationError("@SqlModule can only define tables in the same schema.");
      return ImmutableList.of();
    }

    List validMethodList = WayIterables.from(definesMethodList)
        .filter(new DefinesMethodIsValid())
        .toImmutableList();

    return WayIterables.from(validMethodList)
        .transform(new DefinesMethodToCodeCanvasArtifact())
        .add(sqlModule(typeInfo, validMethodList))
        .toImmutableList();
  }

  private Object newInstance(SimpleTypeInfo simpleTypeInfo) {
    Object instance = instanceMap.get(simpleTypeInfo);

    if (instance == null) {
      try {
        instance = newInstanceOrCompileAndInstantiate(simpleTypeInfo);
        instanceMap.put(simpleTypeInfo, instance);
      } catch (ClassNotFoundException e) {
        throw new RuntimeException(e);
      }
    }

    return instance;
  }

  private Object newInstanceOrCompileAndInstantiate(SimpleTypeInfo typeInfo) throws ClassNotFoundException {
    try {
      return typeInfo.newInstance();

    } catch (ClassNotFoundException e) {
      return compileAndInstantiate(typeInfo);

    }
  }

  private CodeCanvasArtifact sqlModule(TypeInfo typeInfo, List validMethodList) {
    return new SqlModuleContext(typeInfo, validMethodList).toCodeCanvasArtifact();
  }

  private class DefinesMethodIsValid implements Predicate {
    @Override
    public boolean apply(DefinesMethod input) {
      return input.isValid();
    }
  }

  private class DefinesMethodToCodeCanvasArtifact implements Function {
    @Override
    public CodeCanvasArtifact apply(DefinesMethod input) {
      return input.toCodeCanvasArtifact();
    }
  }

  private class DefinesMethodToSchemaName implements Function {
    @Override
    public String apply(DefinesMethod input) {
      return input.toSchemaName();
    }
  }

  private class MethodInfoToDefinesMethod implements Function {

    private final TypeInfo typeInfo;
    private final Object moduleInstance;

    public MethodInfoToDefinesMethod(TypeInfo typeInfo) {
      this.typeInfo = typeInfo;
      SimpleTypeInfo simpleTypeInfo = typeInfo.toSimpleTypeInfo();
      moduleInstance = newInstance(simpleTypeInfo);
    }

    @Override
    public DefinesMethod apply(MethodInfo methodInfo) {
      TableInfo tableInfo = tableInfo(methodInfo);
      return new DefinesMethod(typeInfo, methodInfo, tableInfo);
    }

    private TableInfo tableInfo(MethodInfo methodInfo) {
      return (TableInfo) methodInfo.invoke(moduleInstance);
    }

  }

}