/* Copyright (c) 2006, 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#ifndef SQL_INSERT_INCLUDED
#define SQL_INSERT_INCLUDED

#include "sql_class.h"            // Query_result_interceptor
#include "sql_cmd_dml.h"          // Sql_cmd_dml
#include "sql_data_change.h"      // enum_duplicates

struct TABLE_LIST;
typedef List<Item> List_item;

int check_that_all_fields_are_given_values(THD *thd, TABLE *entry,
                                           TABLE_LIST *table_list);
void prepare_triggers_for_insert_stmt(TABLE *table);
int write_record(THD *thd, TABLE *table,
                 COPY_INFO *info, COPY_INFO *update);
bool validate_default_values_of_unset_fields(THD *thd, TABLE *table);
bool mysql_insert_select_prepare(THD *thd);

class Query_result_insert :public Query_result_interceptor
{
public:
  TABLE_LIST *table_list;
  TABLE *table;
private:
  /**
     The columns of the table to be inserted into, *or* the columns of the
     table from which values are selected. For legacy reasons both are
     allowed.
   */
  List<Item> *fields;
protected:
  /// ha_start_bulk_insert has been called. Never cleared.
  bool bulk_insert_started;
public:
  ulonglong autoinc_value_of_last_inserted_row; // autogenerated or not
  COPY_INFO info;
  COPY_INFO update; ///< the UPDATE part of "info"
  bool insert_into_view;

  /**
     Creates a Query_result_insert for routing a result set to an existing
     table.

     @param table_list_par   The table reference for the destination table.
     @param table_par        The destination table. May be NULL.
     @param target_columns   See details.
     @param target_or_source_columns See details.
     @param update_fields    The columns to be updated in case of duplicate
                             keys. May be NULL.
     @param update_values    The values to be assigned in case of duplicate
                             keys. May be NULL.
     @param duplicate        The policy for handling duplicates.

     @todo This constructor takes 8 arguments, 6 of which are used to
     immediately construct a COPY_INFO object. Obviously the constructor
     should take the COPY_INFO object as argument instead. Also, some
     Query_result_insert members initialized here are totally redundant, as they are
     found inside the COPY_INFO.

     The target_columns and target_or_source_columns arguments are set by
     callers as follows:
     @li if CREATE SELECT:
      - target_columns == NULL,
      - target_or_source_columns == expressions listed after SELECT, as in
          CREATE ... SELECT expressions
     @li if INSERT SELECT:
      target_columns
      == target_or_source_columns
      == columns listed between INSERT and SELECT, as in
          INSERT INTO t (columns) SELECT ...

     We set the manage_defaults argument of info's constructor as follows
     ([...] denotes something optional):
     @li If target_columns==NULL, the statement is
@verbatim
     CREATE TABLE a_table [(columns1)] SELECT expressions2
@endverbatim
     so 'info' must manage defaults of columns1.
     @li Otherwise it is:
@verbatim
     INSERT INTO a_table [(columns1)] SELECT ...
@verbatim
     target_columns is columns1, if not empty then 'info' must manage defaults
     of other columns than columns1.
  */
  Query_result_insert(TABLE_LIST *table_list_par,
                      TABLE *table_par,
                      List<Item> *target_columns,
                      List<Item> *target_or_source_columns,
                      List<Item> *update_fields,
                      List<Item> *update_values,
                      enum_duplicates duplic)
    :table_list(table_list_par),
     table(table_par),
     fields(target_or_source_columns),
     bulk_insert_started(false),
     autoinc_value_of_last_inserted_row(0),
     info(COPY_INFO::INSERT_OPERATION,
          target_columns,
          // manage_defaults
          (target_columns == NULL || target_columns->elements != 0),
          duplic),
     update(COPY_INFO::UPDATE_OPERATION,
            update_fields,
            update_values),
     insert_into_view(table_list_par && table_list_par->is_view())
  {
    DBUG_ASSERT(target_or_source_columns != NULL);
    DBUG_ASSERT(target_columns == target_or_source_columns ||
                target_columns == NULL);
  }


public:
  ~Query_result_insert();
  virtual bool need_explain_interceptor() const { return true; }
  int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
  virtual int prepare2(void);
  bool send_data(List<Item> &items);
  virtual void store_values(List<Item> &values);
  void send_error(uint errcode,const char *err);
  bool send_eof();
  virtual void abort_result_set();
  /* not implemented: Query_result_insert is never re-used in prepared statements */
  void cleanup();
};


/**
   @todo This class inherits a class which is non-abstract. This is not in
   line with good programming practices and the inheritance should be broken
   up.
*/
class Query_result_create: public Query_result_insert {
  TABLE_LIST *create_table;
  HA_CREATE_INFO *create_info;
  TABLE_LIST *select_tables;
  Alter_info *alter_info;
  Field **field;
  /* lock data for tmp table */
  MYSQL_LOCK *m_lock;
  /* m_lock or thd->extra_lock */
  MYSQL_LOCK **m_plock;
public:
  Query_result_create(TABLE_LIST *table_arg,
                      HA_CREATE_INFO *create_info_par,
                      Alter_info *alter_info_arg,
                      List<Item> &select_fields,
                      enum_duplicates duplic,
                      TABLE_LIST *select_tables_arg)
    :Query_result_insert (NULL, // table_list_par
                          NULL, // table_par
                          NULL, // target_columns
                          &select_fields,
                          NULL, // update_fields
                          NULL, // update_values
                          duplic),
     create_table(table_arg),
     create_info(create_info_par),
     select_tables(select_tables_arg),
     alter_info(alter_info_arg),
     m_plock(NULL)
  {}
  int prepare(List<Item> &list, SELECT_LEX_UNIT *u);

  int binlog_show_create_table(TABLE **tables, uint count);
  void store_values(List<Item> &values);
  void send_error(uint errcode,const char *err);
  bool send_eof();
  virtual void abort_result_set();

  // Needed for access from local class MY_HOOKS in prepare(), since thd is proteted.
  const THD *get_thd(void) { return thd; }
  const HA_CREATE_INFO *get_create_info() { return create_info; };
  int prepare2(void);
};


class Sql_cmd_insert_base : public Sql_cmd_dml
{
  /*
    field_list was created for view and should be removed before PS/SP
    rexecuton
  */
  bool empty_field_list_on_rset;

protected:
  const bool is_replace;

public:
  /**
    Field list to insert/replace

    One of two things:
    1. For the INSERT/REPLACE ... (col1, ... colN) VALUES ... syntax
       this is a list of col1, ..., colN fields.
    2. For the INSERT/REPLACE ... SET col1=x1, ... colM=xM syntax extension
       this is a list of col1, ... colM fields as well.
  */
  List<Item>          insert_field_list;
  /**
    ON DUPLICATE KEY UPDATE data value list
  */
  List<Item>          insert_value_list;
  /**
    ON DUPLICATE KEY UPDATE field list
  */
  List<Item>          insert_update_list;
  /**
    Row data to insert/replace

    One of two things:
    1. For the INSERT/REPLACE ... VALUES (row1), (row2), ... (rowN) syntax
       the list contains N List_item lists: one List_item per row.
    2. For the INSERT/REPLACE ... SET col1=x1, ... colM=xM syntax extension
       this list contains only 1 List_item of M data values: this way we
       emulate this syntax:
         INSERT/REPLACE ... (col1, ... colM) VALUE (x1, ..., xM);
  */
  List<List_item>     insert_many_values; // TODO: move to Sql_cmd_insert

  const enum_duplicates duplicates;

  explicit
  Sql_cmd_insert_base(bool is_replace_arg, enum_duplicates duplicates_arg)
  : empty_field_list_on_rset(false),
    is_replace(is_replace_arg),
    duplicates(duplicates_arg)
  {}

  virtual void cleanup(THD *thd)
  {
    if (empty_field_list_on_rset)
    {
      empty_field_list_on_rset= false;
      insert_field_list.empty();
    }
  }


protected:
  bool mysql_prepare_insert(THD *thd,
                            TABLE_LIST *table_list,
                            List_item *values,
                            bool select_insert);
  bool insert_precheck(THD *thd, TABLE_LIST *tables);
  bool mysql_prepare_insert_check_table(THD *thd,
                                        TABLE_LIST *table_list,
                                        List<Item> &fields,
                                        bool select_insert);
};


class Sql_cmd_insert : public Sql_cmd_insert_base
{
public:
  explicit
  Sql_cmd_insert(bool is_replace_arg, enum_duplicates duplicates_arg)
  : Sql_cmd_insert_base(is_replace_arg, duplicates_arg)
  {}

  virtual enum_sql_command sql_command_code() const
  {
    return is_replace ?  SQLCOM_REPLACE : SQLCOM_INSERT;
  }

  virtual bool execute(THD *thd);
  virtual bool prepared_statement_test(THD *thd);
  virtual bool prepare(THD *thd) { return false; }

private:
  bool mysql_insert(THD *thd,TABLE_LIST *table);

  bool mysql_test_insert(THD *thd, TABLE_LIST *table_list);
};


class Sql_cmd_insert_select : public Sql_cmd_insert_base
{
public:
  explicit
  Sql_cmd_insert_select(bool is_replace_arg, enum_duplicates duplicates_arg)
  : Sql_cmd_insert_base(is_replace_arg, duplicates_arg)
  {}

  virtual enum_sql_command sql_command_code() const
  {
    return is_replace ? SQLCOM_REPLACE_SELECT : SQLCOM_INSERT_SELECT;
  }

  virtual bool execute(THD *thd);
  virtual bool prepared_statement_test(THD *thd);
  virtual bool prepare(THD *thd);

protected:
  bool mysql_insert_select_prepare(THD *thd);
};

#endif /* SQL_INSERT_INCLUDED */