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/*
 * Copyright 2015 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 java.lang.annotation.Annotation;
import java.util.List;

import br.com.objectos.way.code.AbstractAnnotationProcessor;
import br.com.objectos.way.code.ClassInfo;
import br.com.objectos.way.code.CodeCanvasArtifact;
import br.com.objectos.way.code.CodeCanvasWriter;
import br.com.objectos.way.code.MethodInfoHasAnnotation;
import br.com.objectos.way.code.MethodInfoHasModifierInfo;
import br.com.objectos.way.code.ModifierInfo;
import br.com.objectos.way.code.TypeInfo;
import br.com.objectos.way.code.mustache.Writers;
import br.com.objectos.way.code.pojo.PojoBuilderContext;
import br.com.objectos.way.code.pojo.PojoBuilderPojoContext;
import br.com.objectos.way.core.tmpl.mustache.MustacheObject;
import br.com.objectos.way.core.util.WayIterables;
import br.com.objectos.way.sql.annotation.SqlPojo;
import br.com.objectos.way.sql.annotation.SqlQuery;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;

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

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

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

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

  @Override
  protected List toArtifactList(TypeInfo typeInfo) {
    List artifactList = ImmutableList.of();

    Optional maybeClassInfo = typeInfo.toClassInfo();
    if (maybeClassInfo.isPresent()) {
      ClassInfo classInfo = maybeClassInfo.get();
      artifactList = toArtifactList(classInfo);
    }

    return artifactList;
  }

  private List toArtifactList(ClassInfo classInfo) {
    List queryMethods = classInfo.getMethodInfoIterable()
        .filter(MethodInfoHasModifierInfo.get(ModifierInfo.ABSTRACT))
        .filter(MethodInfoHasAnnotation.get(SqlQuery.class))
        .transform(new MethodInfoToQuery(classInfo))
        .filter(QueryIsValid.get())
        .toImmutableList();

    return ImmutableList. builder()
        .addAll(queryMethodList(classInfo, queryMethods))
        .add(pojo(classInfo, queryMethods))
        .add(builder(classInfo))
        .add(builderPojo(classInfo))
        .add(loader(classInfo))
        .addAll(pkList(classInfo))
        .build();
  }

  private Iterable queryMethodList(ClassInfo classInfo, List queryMethods) {
    return WayIterables.from(queryMethods)
        .transform(new Function() {
          @Override
          public CodeCanvasArtifact apply(QueryMethod input) {
            return input.toCodeCanvasArtifact();
          }
        })
        .toLazyIterable();
  }

  private CodeCanvasArtifact pojo(ClassInfo classInfo, List queryMethods) {
    PojoInsert pojoInsert = PojoInsert.wrap(classInfo);
    PojoContext pojo = new PojoContext(getClass(), classInfo, pojoInsert, queryMethods);
    return CodeCanvasWriter.forTemplate("/way-sql-compiler/Pojo.mustache")
        .namedAfter(classInfo, "Pojo")
        .toCodeCanvasArtifact(Writers.INSTANCE, pojo.get());
  }

  private CodeCanvasArtifact builder(ClassInfo classInfo) {
    MustacheObject context = new PojoBuilderContext(getClass(), classInfo).get();
    return CodeCanvasWriter.forTemplate("/way-code-pojo/PojoBuilder.mustache")
        .namedAfter(classInfo, "Builder")
        .toCodeCanvasArtifact(Writers.INSTANCE, context);
  }

  private CodeCanvasArtifact builderPojo(ClassInfo classInfo) {
    MustacheObject context = new PojoBuilderPojoContext(getClass(), classInfo).get();
    return CodeCanvasWriter.forTemplate("/way-code-pojo/PojoBuilderPojo.mustache")
        .namedAfter(classInfo, "BuilderPojo")
        .toCodeCanvasArtifact(Writers.INSTANCE, context);
  }

  private CodeCanvasArtifact loader(ClassInfo classInfo) {
    MustacheObject context = new PojoLoaderContext(getClass(), classInfo).get();
    return CodeCanvasWriter.forTemplate("/way-sql-compiler/PojoLoader.mustache")
        .namedAfter(classInfo, "Loader")
        .toCodeCanvasArtifact(Writers.INSTANCE, context);
  }

  private List pkList(ClassInfo classInfo) {
    List list = ImmutableList.of();

    Pk pk = Pk.of(classInfo);
    if (pk.shouldGenerate()) {
      list = ImmutableList. builder()
          .add(pk(classInfo, pk))
          .add(pkPojo(classInfo, pk))
          .add(pkSql(classInfo, pk))
          .build();
    }

    return list;
  }

  private CodeCanvasArtifact pk(ClassInfo classInfo, Pk pk) {
    MustacheObject context = new PojoPkContext(getClass(), classInfo, pk).get();
    return CodeCanvasWriter.forTemplate("/way-sql-compiler/PojoPk.mustache")
        .namedAfter(classInfo, "Pk")
        .toCodeCanvasArtifact(Writers.INSTANCE, context);
  }

  private CodeCanvasArtifact pkPojo(ClassInfo classInfo, Pk pk) {
    MustacheObject context = new PojoPkPojoContext(getClass(), classInfo, pk).get();
    return CodeCanvasWriter.forTemplate("/way-sql-compiler/PojoPkPojo.mustache")
        .namedAfter(classInfo, "PkPojo")
        .toCodeCanvasArtifact(Writers.INSTANCE, context);
  }

  private CodeCanvasArtifact pkSql(ClassInfo classInfo, Pk pk) {
    MustacheObject context = new PojoPkSqlContext(getClass(), classInfo, pk).get();
    return CodeCanvasWriter.forTemplate("/way-sql-compiler/PojoPkSql.mustache")
        .namedAfter(classInfo, "PkSql")
        .toCodeCanvasArtifact(Writers.INSTANCE, context);
  }

}