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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.util.List;
import java.util.Set;

import br.com.objectos.way.code.AnnotationInfo;
import br.com.objectos.way.code.AnnotationInfoEnclosingTypeInfo;
import br.com.objectos.way.code.ClassInfo;
import br.com.objectos.way.code.ImportInfo;
import br.com.objectos.way.code.ImportInfoSet;
import br.com.objectos.way.code.MethodInfo;
import br.com.objectos.way.code.NameInfo;
import br.com.objectos.way.code.PackageInfo;
import br.com.objectos.way.code.SimpleTypeInfo;
import br.com.objectos.way.code.TypeInfo;
import br.com.objectos.way.core.tmpl.mustache.IsMustacheSerializable;
import br.com.objectos.way.core.tmpl.mustache.MustacheObject;
import br.com.objectos.way.core.tmpl.mustache.Mustaches;
import br.com.objectos.way.core.util.WayIterables;
import br.com.objectos.way.sql.Parameter;
import br.com.objectos.way.sql.SqlException;
import br.com.objectos.way.sql.Transaction;
import br.com.objectos.way.sql.WaySql;

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

/**
 * @author [email protected] (Marcio Endo)
 */
abstract class QuerySql implements IsMustacheSerializable {

  private final ClassInfo classInfo;
  private final MethodInfo methodInfo;

  private final TypeInfo joinedTypeInfo;
  private final List columnList;
  private final Optional parameter;

  QuerySql(ClassInfo classInfo, MethodInfo methodInfo, TypeInfo joinedTypeInfo) {
    this.classInfo = classInfo;
    this.methodInfo = methodInfo;
    this.joinedTypeInfo = joinedTypeInfo;
    columnList = SqlColumn.columnListOf(joinedTypeInfo);
    parameter = QueryParameter.parameterOf(methodInfo);
  }

  public static QuerySql wrap(ClassInfo classInfo, MethodInfo methodInfo) {
    SimpleTypeInfo returnTypeInfo = methodInfo.returnTypeInfo();

    if (returnTypeInfo.isInfoOf(List.class)) {
      TypeInfo relatedTypeInfo = relatedTypeInfo(returnTypeInfo);
      return new QueryListSql(classInfo, methodInfo, relatedTypeInfo);
    }

    if (returnTypeInfo.isInfoOf(Optional.class)) {
      TypeInfo relatedTypeInfo = relatedTypeInfo(returnTypeInfo);
      return new QueryMaybeSql(classInfo, methodInfo, relatedTypeInfo);
    }

    throw new AssertionError();
  }

  private static TypeInfo relatedTypeInfo(SimpleTypeInfo returnTypeInfo) {
    return returnTypeInfo.getTypeParameterInfoIterable()
        .first()
        .get()
        .getTypeInfo()
        .get();
  }

  @Override
  public MustacheObject toMustache() {
    ImportInfoSet importInfoSet = importInfoSet();
    List imports = importInfoSet.toImportInfoList(classInfo);

    return Mustaches.toMustacheHelper()
        .add("imports", imports)
        .add("emptyImports", imports.isEmpty())

        .add("columns", columns())
        .add("joinedClass", joinedTypeInfo)
        .add("orderBy", orderBy())
        .add("processorClass", SqlPojoProcessor.class.getName())
        .add("queryParameter", parameter.orNull())
        .add("queryReturn", queryReturn(joinedTypeInfo))
        .add("selectClassName", selectClassName())
        .add("selectMethodName", selectMethodName())
        .add("sqlClassName", sqlClasName())
        .add("superClass", classInfo)
        .add("tables", tables())
        .toMustache();
  }

  ImportInfoSet importInfoSet() {
    ImportInfoSet importInfoSet = ImportInfoSet.setOf();

    importInfoSet.add(Parameter.class);
    importInfoSet.add(SqlException.class);
    importInfoSet.add(Transaction.class);
    importInfoSet.add(WaySql.class);

    importInfoSet.addAll(joinedTypeInfo.toImportInfo());
    addAll(importInfoSet);

    if (parameter.isPresent()) {
      QueryParameter _parameter = parameter.get();
      _parameter.addTo(importInfoSet);
    }

    return importInfoSet;
  }

  abstract String queryReturn(TypeInfo joinedTypeInfo);

  abstract String selectClassName();

  abstract String selectMethodName();

  private void addAll(ImportInfoSet importInfoSet) {
    PackageInfo joinedPackageInfo = joinedTypeInfo.packageInfo();
    String joinedLoaderName = joinedTypeInfo.getSimpleName() + "Loader";
    NameInfo joinedLoaderNamedInfo = NameInfo.of(joinedLoaderName);
    ImportInfo joinedLoaderImportInfo = joinedPackageInfo.toImportInfo(joinedLoaderNamedInfo);
    importInfoSet.add(joinedLoaderImportInfo);
  }

  private List columns() {
    return WayIterables.from(columnList)
        .transform(new Function() {
          @Override
          public QueryColumn apply(SqlColumn input) {
            return input.toQueryColumn(classInfo);
          }
        })
        .toImmutableList();
  }

  private QueryOrderBy orderBy() {
    return QueryOrderBy.wrap(methodInfo);
  }

  private String sqlClasName() {
    return classInfo.getSimpleName() + methodInfo.getClassName() + "Sql";
  }

  private Set tables() {
    return WayIterables.from(columnList)
        .transform(new Function() {
          @Override
          public AnnotationInfo apply(SqlColumn input) {
            return input.getAnnotationInfo();
          }
        })
        .transform(AnnotationInfoEnclosingTypeInfo.get())
        .presentInstancesOf(SimpleTypeInfo.class)
        .toImmutableSet();
  }

}