// The MIT License (MIT)

// Copyright (c) 2017-2020 Uber Technologies Inc.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package sqlite

import (
	"context"
	"database/sql"

	"github.com/uber/cadence/common/persistence/sql/sqlplugin"
)

const (
	deleteHistoryNodesQuery = `WITH events_to_delete AS (
    SELECT shard_id, tree_id, branch_id, node_id, txn_id
    FROM history_node
    WHERE shard_id = ? AND tree_id = ? AND branch_id = ? AND node_id >= ?
    ORDER BY shard_id, tree_id, branch_id, node_id, txn_id
    LIMIT ?
)

DELETE FROM history_node
WHERE (shard_id, tree_id, branch_id, node_id, txn_id) IN (SELECT shard_id, tree_id, branch_id, node_id, txn_id FROM events_to_delete);`
)

// DeleteFromHistoryNode deletes one or more rows from history_node table
func (mdb *DB) DeleteFromHistoryNode(ctx context.Context, filter *sqlplugin.HistoryNodeFilter) (sql.Result, error) {
	dbShardID := sqlplugin.GetDBShardIDFromTreeID(filter.TreeID, mdb.GetTotalNumDBShards())
	return mdb.driver.ExecContext(ctx, dbShardID, deleteHistoryNodesQuery, filter.ShardID, filter.TreeID, filter.BranchID, *filter.MinNodeID, filter.PageSize)
}
