// Copyright 2023 Greptime Team
//
// 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.

syntax = "proto3";

package greptime.v1;

option java_package = "io.greptime.v1";
option java_outer_classname = "Ddl";
option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1";

import "greptime/v1/common.proto";

// "Data Definition Language" requests, that create, modify or delete the
// database structures but not the data. `DdlRequest` could carry more
// information than plain SQL, for example, the "table_id" in `CreateTableExpr`.
// So create a new DDL expr if you need it.
message DdlRequest {
  oneof expr {
    CreateDatabaseExpr create_database = 1;
    CreateTableExpr create_table = 2;
    AlterExpr alter = 3;
    DropTableExpr drop_table = 4;
    TruncateTableExpr truncate_table = 7;
    CreateFlowTaskExpr create_flow_task = 8;
    DropFlowTaskExpr drop_flow_task = 9;
  }
}

// Create a flow task to run the SQL when new data arrives.
message CreateFlowTaskExpr {
  string catalog_name = 1;
  string task_name = 2;
  repeated TableName source_table_names = 3;
  TableName sink_table_name = 4;
  bool or_replace = 5;
  bool create_if_not_exists = 6;
  string expire_when = 7;
  string comment = 8;
  string sql = 9;
  map<string, string> task_options = 10;
}

// Remove a flow task.
message DropFlowTaskExpr {
  string catalog_name = 1;
  string task_name = 2;
}

message CreateTableExpr {
  string catalog_name = 1;
  string schema_name = 2;
  string table_name = 3;
  string desc = 4;
  repeated ColumnDef column_defs = 5;
  string time_index = 6;
  repeated string primary_keys = 7;
  bool create_if_not_exists = 8;
  map<string, string> table_options = 9;
  TableId table_id = 10;
  string engine = 12;
}

message AlterExpr {
  string catalog_name = 1;
  string schema_name = 2;
  string table_name = 3;
  oneof kind {
    AddColumns add_columns = 4;
    DropColumns drop_columns = 5;
    RenameTable rename_table = 6;
    ChangeColumnTypes change_column_types = 7;
  }
}

message DropTableExpr {
  string catalog_name = 1;
  string schema_name = 2;
  string table_name = 3;
  TableId table_id = 4;
  bool drop_if_exists = 5;
}

message CreateDatabaseExpr {
  string catalog_name = 1;
  string schema_name = 2;
  bool create_if_not_exists = 3;
  map<string, string> options = 4;
}

message TruncateTableExpr {
  string catalog_name = 1;
  string schema_name = 2;
  string table_name = 3;
  TableId table_id = 4;
}

message DropDatabaseExpr {
  string catalog_name = 1;
  string schema_name = 2;
  bool drop_if_exists = 3;
}

message AddColumns { repeated AddColumn add_columns = 1; }

message DropColumns { repeated DropColumn drop_columns = 1; }

message ChangeColumnTypes { repeated ChangeColumnType change_column_types = 1; }

message RenameTable { string new_table_name = 1; }

message AddColumn {
  ColumnDef column_def = 1;
  AddColumnLocation location = 3;
}

message ChangeColumnType {
    string column_name = 1;
    ColumnDataType target_type = 2;
    ColumnDataTypeExtension target_type_extension = 3;
}

message DropColumn { string name = 1; }

message TableId { uint32 id = 1; }

message ColumnDef {
  string name = 1;
  ColumnDataType data_type = 2;
  bool is_nullable = 3;
  bytes default_constraint = 4;
  SemanticType semantic_type = 5;
  string comment = 6;
  // Extension for ColumnDataType.
  ColumnDataTypeExtension datatype_extension = 7;
}

message AddColumnLocation {
  enum LocationType {
    FIRST = 0;
    AFTER = 1;
  }
  LocationType location_type = 1;
  string after_column_name = 2;
}
