/*
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 cmd

import (
	"context"
	"errors"
	"slices"

	"codeberg.org/scip/esctl/pkg/cfg"
	"codeberg.org/scip/esctl/pkg/es"

	"github.com/urfave/cli/v3"
)

func IndexTemplate(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:    "template",
		Aliases: []string{"tpl"},
		Usage:   "manage index templates",

		Commands: []*cli.Command{
			IndexTemplateList(conf),
			IndexTemplateShow(conf),
			IndexTemplateCreate(conf, false),
			IndexTemplateCreate(conf, true),
			IndexTemplateDelete(conf),
		},
	}
}

func IndexTemplateList(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:    "list",
		Aliases: []string{"ls"},
		Usage:   "list index templates",

		Flags: []cli.Flag{
			&cli.StringSliceFlag{
				Name:        "filter-index-pattern",
				Usage:       "show only index templates which use patterns, which match the filter",
				Destination: &conf.Filter,
				Aliases:     []string{"F"},
			},
			&cli.BoolFlag{
				Name:        "hidden",
				Usage:       "show hidden index templates as well",
				Destination: &conf.Hidden,
				Aliases:     []string{"H"},
			},
		},

		Action: func(ctx context.Context, cmd *cli.Command) error {
			return es.IndexTemplateList(conf, cmd.Args().Get(0))
		},
	}
}

func IndexTemplateShow(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:    "show",
		Aliases: []string{"sh"},
		Usage:   "show details about an index template",

		Action: func(ctx context.Context, cmd *cli.Command) error {
			index := cmd.Args().Get(0)
			if index == "" {
				return errors.New("no index template specified")
			}

			return es.IndexTemplateShow(conf, cmd.Args().Get(0))
		},

		ShellComplete: func(ctx context.Context, cmd *cli.Command) {
			complete(conf, cmd, Cindextemplate)
		},
	}
}

func IndexTemplateCreate(conf *cfg.Config, modify bool) *cli.Command {
	name := "create"
	alias := "+"
	required := true

	if modify {
		name = "update"
		alias = "upd"
		required = false
	}

	return &cli.Command{
		Name:      name,
		Aliases:   []string{alias},
		Usage:     name + " a new index template",
		UsageText: name + ` <name> <fieldmapping:type>...`,
		CustomHelpTemplate: addReference(
			`Valid field mapping types: integer, text, date, keyword

Doc for index settings:
https://www.elastic.co/docs/reference/elasticsearch/index-settings
`),

		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:        "data-stream",
				Usage:       "template creates a data stream",
				Destination: &conf.Stream,
				Aliases:     []string{"S"},
			},
			&cli.BoolFlag{
				Name:        "allow-auto-create",
				Usage:       "automatically create indices",
				Destination: &conf.AutoCreate,
				Aliases:     []string{"a"},
			},
			&cli.BoolFlag{
				Name:        "rollover",
				Usage:       "automatically rollover associated aliases",
				Destination: &conf.Rollover,
				Aliases:     []string{"R"},
			},
			&cli.StringFlag{
				Name:        "mode",
				Usage:       "index mode, one of: standard, timeseries, logsdb or lookup",
				Destination: &conf.Mode,
				Aliases:     []string{"m"},
			},
			&cli.StringFlag{
				Name:        "retention",
				Usage:       "data retention, e.g. -1 (infinitely), 30d, 3m or 1y (data stream only)",
				Destination: &conf.Retention,
				Aliases:     []string{"r"},
				Required:    required,
			},
			&cli.IntFlag{
				Name:        "priority",
				Usage:       "index template priority",
				Destination: &conf.Priority,
				Aliases:     []string{"p"},
			},
			&cli.StringSliceFlag{
				Name:        "index-pattern",
				Usage:       "index matching pattern",
				Destination: &conf.Patterns,
				Aliases:     []string{"i"},
				Required:    required,
			},
			&cli.StringSliceFlag{
				Name:        "settings",
				Usage:       "individual template settings, format: name:value, multiple possible",
				Destination: &conf.Settings,
				Aliases:     []string{"s"},
			},
			&cli.StringSliceFlag{
				Name:        "component",
				Usage:       "include component template, multiple possible",
				Destination: &conf.Components,
				Aliases:     []string{"c"},
			},
			&cli.StringSliceFlag{
				Name:        "meta",
				Usage:       "custom meta field, format: name:value, multiple possible",
				Destination: &conf.Meta,
				Aliases:     []string{"M"},
			},
			&cli.StringSliceFlag{
				Name:        "aliases",
				Usage:       "set up aliases to associate with indices",
				Destination: &conf.Aliases,
				Aliases:     []string{"A"},
			},
			&cli.StringFlag{
				Name:        "ilm-policy",
				Usage:       "ilm policy to apply",
				Destination: &conf.Policy,
				Aliases:     []string{"p"},
			},
		},

		Action: func(ctx context.Context, cmd *cli.Command) error {
			args := cmd.Args()
			if args.Len() == 0 {
				return errors.New("no name specified")
			}

			if conf.Mode != "" {
				if !slices.Contains([]string{"standard", "timeseries", "logsdb", "lookup"}, conf.Mode) {
					return errors.New("mode must be one of: standard, timeseries, logsdb or lookup")
				}
			}

			mappings := args.Slice()[1:]

			if modify {
				return es.IndexTemplateModify(conf, args.Get(0), mappings)
			}

			return es.IndexTemplateCreate(conf, args.Get(0), mappings)
		},
	}
}

func IndexTemplateDelete(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:    "delete",
		Aliases: []string{"rm"},
		Usage:   "delete an index template",

		Action: func(ctx context.Context, cmd *cli.Command) error {
			index := cmd.Args().Get(0)
			if index == "" {
				return errors.New("no index template specified")
			}

			return es.IndexTemplateDelete(conf, cmd.Args().Get(0))
		},

		ShellComplete: func(ctx context.Context, cmd *cli.Command) {
			complete(conf, cmd, Cindextemplate)
		},
	}
}