/*
 * Copyright (c) 2015, 2021, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2.0,
 * as published by the Free Software Foundation.
 *
 * This program is also distributed with certain software (including
 * but not limited to OpenSSL) that is licensed under separate terms,
 * as designated in a particular file or component or in included license
 * documentation.  The authors of MySQL hereby grant you an additional
 * permission to link the program and your derivative works with the
 * separately licensed software that they have included with MySQL.
 *
 * 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, version 2.0, 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
 */
syntax = "proto2";

// ifdef PROTOBUF_LITE: option optimize_for = LITE_RUNTIME;

// Basic CRUD operations
package Mysqlx.Crud;
option java_package = "com.mysql.cj.x.protobuf";

import "mysqlx_expr.proto";
import "mysqlx_datatypes.proto";

// column definition
message Column {
  optional string name = 1;
  optional string alias = 2;
  repeated Mysqlx.Expr.DocumentPathItem document_path = 3;
}

// a projection
//
// :param source: the expression identifying an element from the source data
//                which can include a column identifier or any expression
// :param alias: optional alias. Required for DOCUMENTs (clients may use 
//              the source string as default)
message Projection {
    required Mysqlx.Expr.Expr source = 1;
    optional string alias = 2;
}

// DataModel to use for filters, names, ...
enum DataModel {
  DOCUMENT = 1;
  TABLE = 2;
};

// collection
message Collection {
  required string name = 1;
  optional string schema = 2;
}

// limit
//
// :param row_count: maximum rows to filter
// :param offset: maximum rows to skip before applying the row_count
message Limit {
  required uint64 row_count = 1;
  optional uint64 offset = 2;
}

// sort order
message Order {
  enum Direction {
    ASC = 1;
    DESC = 2;
  };

  required Mysqlx.Expr.Expr expr = 1;
  optional Direction direction = 2 [ default=ASC ];
}

// update operations
//
// :param source: specification of the value to be updated
//      if data_model is TABLE, a column name may be specified and also a document path, if the column has type JSON
//      if data_model is DOCUMENT, only document paths are allowed
//      in both cases, schema and table must be not set
// :param operation: the type of operation to be performed
// :param value: an expression to be computed as the new value for the operation
message UpdateOperation {
  enum UpdateType {
    SET = 1;            // only allowed for TABLE
    ITEM_REMOVE = 2;    // no value (removes the identified path from a object or array)
    ITEM_SET = 3;       // sets the new value on the identified path
    ITEM_REPLACE = 4;   // replaces a value if the path exists
    ITEM_MERGE = 5;     // source and value must be documents
    ARRAY_INSERT = 6;   // insert the value in the array at the index identified in the source path
    ARRAY_APPEND = 7;   // append the value on the array at the identified path
  }
  required Mysqlx.Expr.ColumnIdentifier source = 1;
  required UpdateType operation = 2;
  optional Mysqlx.Expr.Expr value = 3;
}

// Find Documents/Rows in a Collection/Table
//
// .. uml::
//
//   client -> server: Find
//   ... one or more Resultset ...
//
// :param collection: collection to insert into
// :param data_model: datamodel that the operations refer to
// :param projection: list of column projections that shall be returned
// :param args: values for parameters used in filter expression
// :param criteria: filter criteria
// :param limit: numbers of rows that shall be skipped and returned
// :param order: sort-order in which the rows/document shall be returned in
// :param grouping: column expression list for aggregation (GROUP BY)
// :param grouping_criteria: filter criteria for aggregated groups
// :Returns: :protobuf:msg:`Mysqlx.Resultset::`
message Find {
  required Collection collection = 2;

  optional DataModel data_model = 3;
  repeated Projection projection = 4;
  optional Mysqlx.Expr.Expr criteria = 5;
  repeated Mysqlx.Datatypes.Scalar args = 11;
  optional Limit limit = 6;
  repeated Order order = 7;
  repeated Mysqlx.Expr.Expr grouping = 8;
  optional Mysqlx.Expr.Expr grouping_criteria = 9;
};

// Insert documents/rows into a collection/table
//
// :param collection: collection to insert into
// :param data_model: datamodel that the operations refer to
// :param projection: name of the columns to insert data into (empty if data_model is DOCUMENT)
// :param row: set of rows to insert into the collection/table (a single expression with a JSON document literal or an OBJECT expression)
// :param args: values for parameters used in row expressions
// :Returns: :protobuf:msg:`Mysqlx.Resultset::`
message Insert {
  required Collection collection = 1;

  optional DataModel data_model = 2;
  repeated Column projection = 3;

  message TypedRow {
    repeated Mysqlx.Expr.Expr field = 1;
  };
  repeated TypedRow row = 4;
  repeated Mysqlx.Datatypes.Scalar args = 5; 
};

// Update documents/rows in a collection/table
//
// :param collection: collection to change
// :param data_model: datamodel that the operations refer to
// :param criteria: filter expression to match rows that the operations will apply on
// :param args: values for parameters used in filter expression
// :param limit: limits the number of rows to match
// :param order: specifies order of matched rows
// :param operation: list of operations to be applied. Valid operations will depend on the data_model.
// :Returns: :protobuf:msg:`Mysqlx.Resultset::`
message Update {
  required Collection collection = 2;

  optional DataModel data_model = 3;
  optional Mysqlx.Expr.Expr criteria = 4;
  repeated Mysqlx.Datatypes.Scalar args = 8;
  optional Limit limit = 5;
  repeated Order order = 6;

  repeated UpdateOperation operation = 7;
};

// Delete documents/rows from a Collection/Table
//
// :param collection: collection to change
// :param data_model: datamodel that the operations refer to
// :param criteria: filter expression to match rows that the operations will apply on
// :param args: values for parameters used in filter expression
// :param limit: limits the number of rows to match
// :param order: specifies order of matched rows
// :Returns: :protobuf:msg:`Mysqlx.Resultset::`
message Delete {
  required Collection collection = 1;

  optional DataModel data_model = 2;
  optional Mysqlx.Expr.Expr criteria = 3;
  repeated Mysqlx.Datatypes.Scalar args = 6;
  optional Limit limit = 4;
  repeated Order order = 5;
};


// ViewAlgorithm defines how MySQL Server processes the view
enum ViewAlgorithm {
  UNDEFINED =1;   // MySQL chooses which algorithm to use
  MERGE = 2;      // the text of a statement that refers to the view and the view definition are merged
  TEMPTABLE = 3;  // the view are retrieved into a temporary table
}

// ViewSqlSecurity defines the security context in which the view is going to be
// executed, this means that VIEW can be executed with current user permissions or
// with permissions of the uses who defined the VIEW
enum ViewSqlSecurity {
  INVOKER = 1;
  DEFINER = 2;
}


// ViewCheckOption limits the write operations done on a `VIEW`
// (`INSERT`, `UPDATE`, `DELETE`) to rows in which the `WHERE` clause is `TRUE`
enum ViewCheckOption {
  LOCAL = 1;     // the view WHERE clause is checked, but no underlying views are checked
  CASCADED = 2;  // the view WHERE clause is checked, then checking recurses to underlying views
}


// CreateView create view based on indicated Mysqlx.Crud.Find message
//
// param collection: name of the VIEW object, which should be created
// param definer: user name of the definer, if the value isn't set then the definer is current user
// param algorithm: defines how MySQL Server processes the view
// param security: defines the security context in which the view is going be executed
// param check: limits the write operations done on a VIEW
// param column: defines the list of aliases for column names specified in `stmt`
// param stmt: Mysqlx.Crud.Find message from which the SELECT statement is going to be build
// param replace_existing: if true then suppress error when created view already exists; just replace it

message CreateView {
  required Collection collection = 1;

  optional string definer = 2;
  optional ViewAlgorithm algorithm = 3 [default = UNDEFINED];
  optional ViewSqlSecurity security = 4 [default = DEFINER];
  optional ViewCheckOption check = 5;

  repeated string column = 6;
  required Find stmt = 7;
  optional bool replace_existing = 8 [default = false];
}


// ModifyView modify existing view based on indicated Mysqlx.Crud.Find message
//
// param collection: name of the VIEW object, which should be modified
// param definer: user name of the definer, if the value isn't set then the definer is current user
// param algorithm: defined how MySQL Server processes the view
// param security: defines the security context in which the view is going be executed
// param check: limits the write operations done on a VIEW
// param column: defines the list of aliases for column names specified in `stmt`
// param stmt: Mysqlx.Crud.Find message from which the SELECT statement is going to be build

message ModifyView {
  required Collection collection = 1;

  optional string definer = 2;
  optional ViewAlgorithm algorithm = 3;
  optional ViewSqlSecurity security = 4;
  optional ViewCheckOption check = 5;

  repeated string column = 6;
  optional Find stmt = 7;
}


// DropView removing existing view
//
// param collection: name of the VIEW object, which should be deleted
// param if_exists: if true then suppress error when deleted view does not exists

message DropView {
  required Collection collection = 1;
  optional bool if_exists = 2 [ default = false ];
}
