// Copyright 2024 PingCAP, Inc.
//
// 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.

package executor

import (
	"context"
	"strconv"

	"github.com/pingcap/tidb/pkg/ddl"
	"github.com/pingcap/tidb/pkg/domain/infosync"
	"github.com/pingcap/tidb/pkg/executor/internal/exec"
	"github.com/pingcap/tidb/pkg/sessionctx/variable"
	"github.com/pingcap/tidb/pkg/util/chunk"
	"github.com/pingcap/tidb/pkg/util/sem"
)

// ShowDDLExec represents a show DDL executor.
type ShowDDLExec struct {
	exec.BaseExecutor

	ddlOwnerID string
	selfID     string
	ddlInfo    *ddl.Info
	done       bool
}

var _ exec.Executor = &ShowDDLExec{}

// Next implements the Executor Next interface.
func (e *ShowDDLExec) Next(ctx context.Context, req *chunk.Chunk) error {
	req.Reset()
	if e.done {
		return nil
	}

	ddlJobs := ""
	query := ""
	l := len(e.ddlInfo.Jobs)
	for i, job := range e.ddlInfo.Jobs {
		ddlJobs += job.String()
		query += job.Query
		if i != l-1 {
			ddlJobs += "\n"
			query += "\n"
		}
	}
	serverAddress := variable.DefHostname + ":4000"
	if !sem.IsEnabled() {
		serverInfo, err := infosync.GetServerInfoByID(ctx, e.ddlOwnerID)
		if err != nil {
			return err
		}
		serverAddress = serverInfo.IP + ":" +
			strconv.FormatUint(uint64(serverInfo.Port), 10)
	}
	req.AppendInt64(0, e.ddlInfo.SchemaVer)
	req.AppendString(1, e.ddlOwnerID)
	req.AppendString(2, serverAddress)
	req.AppendString(3, ddlJobs)
	req.AppendString(4, e.selfID)
	req.AppendString(5, query)

	e.done = true
	return nil
}