/*
Copyright © 2026 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

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 for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package es

import (
	"context"
	"encoding/json"
	"fmt"
	"log/slog"

	"codeberg.org/scip/esctl/pkg/cfg"
	"github.com/urfave/cli/v3"
)

// recursively traverse  the raw  settings hash and  build a  flat map
// consisting of the translated path and its value.
//
// e.g.
// logger:
//
//	org:
//	  elasticsearch:
//	    transport:
//	      OutboundHandler: "ERROR"
//
// gets:
//
// logger.org.elasticsearch.transport.OutboundHandler: "ERROR"
func getJsonPath(raw map[string]any, topic string) map[string]string {
	paths := map[string]string{}

	for name, data := range raw {
		path := topic + "." + name
		switch value := data.(type) {
		case string:
			paths[path] = value
		case map[string]any:
			paths = getJsonPath(value, path)
		}
	}

	return paths
}

func ClusterSettingsList(conf *cfg.Config) error {
	res, err := conf.DefaultCluster.ES.Cluster.GetSettings().
		Header("content-type", "application/json").
		Header("accept", "application/json").
		Do(context.Background())
	if err != nil {
		return fmt.Errorf("failed to get cluster settings: %s", err)
	}

	table := NewTable(2, 0)
	table.Addheaders("setting", "value")
	entries := [][]string{}

	settingshash := res.Persistent // == map[string]json.RawMessage

	switch {
	case conf.Transient:
		settingshash = res.Transient
	case conf.Default:
		settingshash = res.Defaults
	}

	for topic, val := range settingshash {
		data := map[string]any{}

		err := json.Unmarshal(val, &data)
		if err != nil {
			return fmt.Errorf("failed to unmarshall setting for topic %s: %s", topic, err)
		}

		paths := getJsonPath(data, topic)
		slog.Debug("settings", topic, paths)

		for setting, value := range paths {
			entries = append(entries, []string{
				fmt.Sprintf("%s", setting),
				fmt.Sprintf("%v", value),
			})

		}
	}

	table.entries = entries
	table.Sort()

	if err := table.PrintMarkdown(); err != nil {
		return err
	}

	return nil
}

func ClusterSettingsSet(conf *cfg.Config, args cli.Args) error {
	put := conf.Clusters[conf.CurrentCluster].ES.Cluster.PutSettings()

	for _, arg := range args.Slice() {
		setting, value := splitArg(arg)

		switch {
		case conf.Transient:
			message, err := json.Marshal(value)
			if err != nil {
				return fmt.Errorf("failed to marshall transient value <%v> to valid JSON: %s", value, err)
			}
			put.AddTransient(setting, message)
		case conf.Persistent:
			fallthrough
		default:
			message, err := json.Marshal(value)
			if err != nil {
				return fmt.Errorf("failed to marshall persistent value <%v> to valid JSON: %s", value, err)
			}
			put.AddPersistent(setting, message)
		}
	}

	_, err := put.
		Header("content-type", "application/json").
		Header("accept", "application/json").
		Do(context.Background())

	if err != nil {
		return fmt.Errorf("failed to set settings: %s", err)
	}

	return nil
}