/*
    *    Copyright 2016-2025 the original author or authors.
    *
    *    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
    *
    *       https://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 org.mybatis.dynamic.sql.insert;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.List;
  import java.util.Objects;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.SqlColumn;
  import org.mybatis.dynamic.sql.SqlTable;
  import org.mybatis.dynamic.sql.util.AbstractColumnMapping;
  import org.mybatis.dynamic.sql.util.Buildable;
  import org.mybatis.dynamic.sql.util.ConstantMapping;
  import org.mybatis.dynamic.sql.util.NullMapping;
  import org.mybatis.dynamic.sql.util.PropertyMapping;
  import org.mybatis.dynamic.sql.util.RowMapping;
  import org.mybatis.dynamic.sql.util.StringConstantMapping;
  
  public class BatchInsertDSL<T> implements Buildable<BatchInsertModel<T>> {
  
      private final Collection<T> records;
      private final SqlTable table;
      private final List<AbstractColumnMapping> columnMappings;
  
      private BatchInsertDSL(AbstractBuilder<T, ?> builder) {
          this.records = builder.records;
          this.table = Objects.requireNonNull(builder.table);
          this.columnMappings = builder.columnMappings;
      }
  
      public <F> ColumnMappingFinisher<F> map(SqlColumn<F> column) {
          return new ColumnMappingFinisher<>(column);
      }
  
      @Override
      public BatchInsertModel<T> build() {
          return BatchInsertModel.withRecords(records)
                  .withTable(table)
                  .withColumnMappings(columnMappings)
                  .build();
      }
  
      @SafeVarargs
      public static <T> BatchInsertDSL.IntoGatherer<T> insert(T... records) {
          return insert(Arrays.asList(records));
      }
  
      public static <T> BatchInsertDSL.IntoGatherer<T> insert(Collection<T> records) {
          return new IntoGatherer<>(records);
      }
  
      public static class IntoGatherer<T> {
          private final Collection<T> records;
  
          private IntoGatherer(Collection<T> records) {
              this.records = records;
          }
  
          public BatchInsertDSL<T> into(SqlTable table) {
              return new Builder<T>().withRecords(records).withTable(table).build();
          }
      }
  
      public class ColumnMappingFinisher<F> {
          private final SqlColumn<F> column;
  
          public ColumnMappingFinisher(SqlColumn<F> column) {
              this.column = column;
          }
  
          public BatchInsertDSL<T> toProperty(String property) {
              columnMappings.add(PropertyMapping.of(column, property));
              return BatchInsertDSL.this;
          }
  
          public BatchInsertDSL<T> toNull() {
              columnMappings.add(NullMapping.of(column));
              return BatchInsertDSL.this;
          }
  
          public BatchInsertDSL<T> toConstant(String constant) {
              columnMappings.add(ConstantMapping.of(column, constant));
              return BatchInsertDSL.this;
         }
 
         public BatchInsertDSL<T> toStringConstant(String constant) {
             columnMappings.add(StringConstantMapping.of(column, constant));
             return BatchInsertDSL.this;
         }
 
         public BatchInsertDSL<T> toRow() {
             columnMappings.add(RowMapping.of(column));
             return BatchInsertDSL.this;
         }
     }
 
     public abstract static class AbstractBuilder<T, B extends AbstractBuilder<T, B>> {
         final Collection<T> records = new ArrayList<>();
         @Nullable SqlTable table;
         final List<AbstractColumnMapping> columnMappings = new ArrayList<>();
 
         public B withRecords(Collection<T> records) {
             this.records.addAll(records);
             return getThis();
         }
 
         public B withTable(SqlTable table) {
             this.table = table;
             return getThis();
         }
 
         public B withColumnMappings(Collection<? extends AbstractColumnMapping> columnMappings) {
             this.columnMappings.addAll(columnMappings);
             return getThis();
         }
 
         protected abstract B getThis();
     }
 
     public static class Builder<T> extends AbstractBuilder<T, Builder<T>> {
         @Override
         protected Builder<T> getThis() {
             return this;
         }
 
         public BatchInsertDSL<T> build() {
             return new BatchInsertDSL<>(this);
         }
     }
 }