/*
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"
	"errors"
	"fmt"
	"log/slog"
	"regexp"
	"strings"

	"codeberg.org/scip/esctl/pkg/cfg"
	"codeberg.org/scip/esctl/pkg/printer"
)

var (
	findIndex = regexp.MustCompile(`^\d{4}\.\d{2}\.\d{2}\-(.*)\-timeseries`)
)

type Snapshot struct {
	Name       string
	Forindex   string
	Orphaned   string
	Status     string
	Start      string
	IndexCount int
}

func SnapshotList(conf *cfg.Config) error {
	// get partial indicies
	ires, err := conf.DefaultCluster.ES().Cat.Indices().Do(context.Background())
	if err != nil {
		return fmt.Errorf("failed to get indicies: %s", esErrorString(err))
	}

	indicies := map[string]int{}

	for _, index := range ires {
		name := strings.ReplaceAll(*index.Index, "partial-", "")
		indicies[name] = 1
	}

	// get snapshots
	sres, err := conf.DefaultCluster.ES().Cat.Snapshots().Do(context.Background())
	if err != nil {
		return fmt.Errorf("failed to get snapshots: %s", esErrorString(err))
	}

	slog.Debug("ES result", "indicies", sres)

	snapshots := []*Snapshot{} // original snapshot names

	for _, snapshot := range sres {
		snap := &Snapshot{
			Name:     *snapshot.Id,
			Status:   *snapshot.Status,
			Start:    fmt.Sprintf("%s", snapshot.StartTime),
			Forindex: indexFromSnapshot(*snapshot.Id),
			Orphaned: "no",
		}

		_, exists := indicies[snap.Forindex]
		if !exists {
			snap.Orphaned = "orphaned"
		}

		if (conf.Failed && snap.Orphaned == "orphaned") || !conf.Failed {
			snapshots = append(snapshots, snap)
		}
	}

	table := printer.NewTable(conf, 5, len(snapshots))
	table.Addheaders("name", "index", "start", "orphaned", "status")

	for idx, snap := range snapshots {
		table.Entries[idx] = []any{
			snap.Name,
			snap.Forindex,
			snap.Start,
			snap.Orphaned,
			snap.Status,
		}
	}

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

	return nil
}

func SnapshotShow(conf *cfg.Config, snapshot string) error {
	res, err := conf.DefaultCluster.ES().Snapshot.Get("*", snapshot).Do(context.Background())
	if err != nil {
		return fmt.Errorf("failed to get snapshot: %s", esErrorString(err))
	}

	slog.Debug("ES result", "snapshot", res)

	if res.Total == 0 {
		return errors.New("no snapshot retrieved")
	}

	table := printer.NewTable(conf, 2, 17)
	table.Addheaders("snapshot property", "value")

	snap := res.Snapshots[0]

	table.Entries = [][]any{
		{"snapshot", snapshot},
		{"uuid", snap.Uuid},
		{"repository", *snap.Repository},
		{"version_id", snap.VersionId},
		{"version", *snap.Version},
		{"include_global_state", *snap.IncludeGlobalState},
		{"state", *snap.State},
		{"start_time", snap.StartTime},
		{"end_time", snap.EndTime},
		{"duration_in_millis", *snap.DurationInMillis},
		{"shards-total", snap.Shards.Total},
		{"shards-failed", snap.Shards.Failed},
		{"shards-successful", snap.Shards.Successful},
	}

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

	return nil
}

func indexFromSnapshot(snapshot string) string {
	matches := findIndex.FindStringSubmatch(snapshot)

	if len(matches) != 2 {
		return ""
	}

	return matches[1]
}