// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc.  All rights reserved.
//
// Copyright (c) 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 postgresql

import (
	"context"
	"database/sql"

	"go.temporal.io/server/common/persistence/sql/sqlplugin"
)

const (
	// below are templates for history_node table
	addHistoryNodesQuery = `INSERT INTO history_node (` +
		`shard_id, tree_id, branch_id, node_id, prev_txn_id, txn_id, data, data_encoding) ` +
		`VALUES (:shard_id, :tree_id, :branch_id, :node_id, :prev_txn_id, :txn_id, :data, :data_encoding) `

	getHistoryNodesQuery = `SELECT node_id, prev_txn_id, txn_id, data, data_encoding FROM history_node ` +
		`WHERE shard_id = $1 AND tree_id = $2 AND branch_id = $3 AND ((node_id = $4 AND txn_id > $5) OR node_id > $6) AND node_id < $7 ` +
		`ORDER BY shard_id, tree_id, branch_id, node_id, txn_id LIMIT $8 `

	getHistoryNodeMetadataQuery = `SELECT node_id, prev_txn_id, txn_id FROM history_node ` +
		`WHERE shard_id = $1 AND tree_id = $2 AND branch_id = $3 AND ((node_id = $4 AND txn_id > $5) OR node_id > $6) AND node_id < $7 ` +
		`ORDER BY shard_id, tree_id, branch_id, node_id, txn_id LIMIT $8 `

	deleteHistoryNodeQuery = `DELETE FROM history_node WHERE shard_id = $1 AND tree_id = $2 AND branch_id = $3 AND node_id = $4 AND txn_id = $5 `

	deleteHistoryNodesQuery = `DELETE FROM history_node WHERE shard_id = $1 AND tree_id = $2 AND branch_id = $3 AND node_id >= $4 `

	// below are templates for history_tree table
	addHistoryTreeQuery = `INSERT INTO history_tree (` +
		`shard_id, tree_id, branch_id, data, data_encoding) ` +
		`VALUES (:shard_id, :tree_id, :branch_id, :data, :data_encoding) ` +
		`ON CONFLICT (shard_id, tree_id, branch_id) DO UPDATE ` +
		`SET data = excluded.data, data_encoding = excluded.data_encoding`

	getHistoryTreeQuery = `SELECT branch_id, data, data_encoding FROM history_tree WHERE shard_id = $1 AND tree_id = $2 `

	deleteHistoryTreeQuery = `DELETE FROM history_tree WHERE shard_id = $1 AND tree_id = $2 AND branch_id = $3 `
)

// For history_node table:

// InsertIntoHistoryNode inserts a row into history_node table
func (pdb *db) InsertIntoHistoryNode(
	ctx context.Context,
	row *sqlplugin.HistoryNodeRow,
) (sql.Result, error) {
	// NOTE: txn_id is *= -1 within DB
	row.TxnID = -row.TxnID
	return pdb.conn.NamedExecContext(ctx,
		addHistoryNodesQuery,
		row,
	)
}

// DeleteFromHistoryNode delete a row from history_node table
func (pdb *db) DeleteFromHistoryNode(
	ctx context.Context,
	row *sqlplugin.HistoryNodeRow,
) (sql.Result, error) {
	// NOTE: txn_id is *= -1 within DB
	row.TxnID = -row.TxnID
	return pdb.conn.ExecContext(ctx,
		deleteHistoryNodeQuery,
		row.ShardID,
		row.TreeID,
		row.BranchID,
		row.NodeID,
		row.TxnID,
	)
}

// SelectFromHistoryNode reads one or more rows from history_node table
func (pdb *db) RangeSelectFromHistoryNode(
	ctx context.Context,
	filter sqlplugin.HistoryNodeSelectFilter,
) ([]sqlplugin.HistoryNodeRow, error) {
	var query string
	if filter.MetadataOnly {
		query = getHistoryNodeMetadataQuery
	} else {
		query = getHistoryNodesQuery
	}

	var rows []sqlplugin.HistoryNodeRow
	err := pdb.conn.SelectContext(ctx,
		&rows,
		query,
		filter.ShardID,
		filter.TreeID,
		filter.BranchID,
		filter.MinNodeID,
		-filter.MinTxnID, // NOTE: transaction ID is *= -1 when stored
		filter.MinNodeID,
		filter.MaxNodeID,
		filter.PageSize,
	)
	if err != nil {
		return nil, err
	}
	// NOTE: since we let txn_id multiple by -1 when inserting, we have to revert it back here
	for index := range rows {
		rows[index].TxnID = -rows[index].TxnID
	}
	return rows, nil
}

// DeleteFromHistoryNode deletes one or more rows from history_node table
func (pdb *db) RangeDeleteFromHistoryNode(
	ctx context.Context,
	filter sqlplugin.HistoryNodeDeleteFilter,
) (sql.Result, error) {
	return pdb.conn.ExecContext(ctx,
		deleteHistoryNodesQuery,
		filter.ShardID,
		filter.TreeID,
		filter.BranchID,
		filter.MinNodeID,
	)
}

// For history_tree table:

// InsertIntoHistoryTree inserts a row into history_tree table
func (pdb *db) InsertIntoHistoryTree(
	ctx context.Context,
	row *sqlplugin.HistoryTreeRow,
) (sql.Result, error) {
	return pdb.conn.NamedExecContext(ctx,
		addHistoryTreeQuery,
		row,
	)
}

// SelectFromHistoryTree reads one or more rows from history_tree table
func (pdb *db) SelectFromHistoryTree(
	ctx context.Context,
	filter sqlplugin.HistoryTreeSelectFilter,
) ([]sqlplugin.HistoryTreeRow, error) {
	var rows []sqlplugin.HistoryTreeRow
	err := pdb.conn.SelectContext(ctx,
		&rows,
		getHistoryTreeQuery,
		filter.ShardID,
		filter.TreeID,
	)
	return rows, err
}

// DeleteFromHistoryTree deletes one or more rows from history_tree table
func (pdb *db) DeleteFromHistoryTree(
	ctx context.Context,
	filter sqlplugin.HistoryTreeDeleteFilter,
) (sql.Result, error) {
	return pdb.conn.ExecContext(ctx,
		deleteHistoryTreeQuery,
		filter.ShardID,
		filter.TreeID,
		filter.BranchID,
	)
}
