/*
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"

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

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

func Index(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:    "index",
		Aliases: []string{"i"},
		Usage:   "manage indices",

		Commands: []*cli.Command{
			IndexList(conf),
			IndexShow(conf),
			IndexCreate(conf, false),
			IndexCreate(conf, true),
			IndexDelete(conf),
			IndexClose(conf),
			IndexFields(conf),
			IndexIlm(conf),
			IndexDu(conf),
			IndexCopy(conf),

			// sub commands
			IndexAlias(conf),
			IndexTemplate(conf),
		},
	}
}

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

		Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "max",
				Usage:       "max number of items to process",
				Destination: &conf.MaxItems,
				Aliases:     []string{"m"},
			},
			&cli.BoolFlag{
				Name:        "partials",
				Usage:       "include partial indices",
				Destination: &conf.Partials,
				Aliases:     []string{"p"},
			},
			&cli.BoolFlag{
				Name:        "hidden",
				Usage:       "include hidden indices",
				Destination: &conf.Hidden,
				Aliases:     []string{"H"},
			},
			&cli.BoolFlag{
				Name:        "failed",
				Usage:       "include only red failed indices",
				Destination: &conf.Failed,
				Aliases:     []string{"f"},
			},
			&cli.StringSliceFlag{
				Name:        "filter",
				Usage:       "show only indices matching the filter",
				Destination: &conf.Filter,
				Aliases:     []string{"F"},
			},
		},

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

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

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

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

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

func IndexCreate(conf *cfg.Config, modify bool) *cli.Command {
	name := "create"
	usage := "create a new index"

	if modify {
		name = "update"
		usage = "update an index"
	}

	return &cli.Command{
		Name:    name,
		Aliases: []string{"+"},
		Usage:   usage,
		UsageText: name + ` <name> <fieldmapping:type>...
Valid field mapping types: integer, text, date, keyword`,

		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:        "wait",
				Usage:       "wait for active shards",
				Destination: &conf.Wait,
				Aliases:     []string{"w"},
			},
			&cli.IntFlag{
				Name:        "shards",
				Usage:       "number of shards to create",
				Destination: &conf.Shards,
				Aliases:     []string{"s"},
			},
			&cli.IntFlag{
				Name:        "replicas",
				Usage:       "number of replicas to create",
				Destination: &conf.Replicas,
				Aliases:     []string{"r"},
				Value:       1,
			},
			&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 index specified")
			}

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

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

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

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

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

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

func IndexClose(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "close",
		Usage:     "close an index",
		UsageText: "close <index>",

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

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

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

func IndexFields(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "fields",
		Usage:     "show info about field capabilities",
		UsageText: "index fields <index>",

		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:        "aggretable",
				Usage:       "include only aggretable fields",
				Destination: &conf.Aggretable,
				Aliases:     []string{"a"},
			},
			&cli.BoolFlag{
				Name:        "searchable",
				Usage:       "include only searchable fields",
				Destination: &conf.Searchable,
				Aliases:     []string{"s"},
			},
			&cli.StringSliceFlag{
				Name:        "type",
				Usage:       "show only fields of this type",
				Destination: &conf.Filter,
				Aliases:     []string{"t"},
			},
		},

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

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

			return es.IndexFields(conf, index)
		},
	}
}

func IndexIlm(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "ilm",
		Usage:     "show ilm status",
		UsageText: "index ilm <index>",

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

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

			return es.IlmExplain(conf, index)
		},
	}
}

func IndexDu(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "du",
		Usage:     "show index disk usage",
		UsageText: "index du <index>",

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

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

			return es.IndexDiskusage(conf, index)
		},
	}
}

func IndexCopy(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "copy",
		Aliases:   []string{"alias", "cp"},
		Usage:     "copy (reindex) documents from one index to another",
		UsageText: "index copy [options] -s <source-index> -t <dest-index>",

		Flags: []cli.Flag{
			// FIXME: not implemented by typed API
			// &cli.BoolFlag{
			// 	Name:        "missing", // op_type
			// 	Usage:       "copy only missing docs",
			// 	Destination: &conf.Missing,
			// 	Aliases:     []string{"m"},
			// },
			// &cli.BoolFlag{
			// 	Name:        "sync", // version_type to external
			// 	Usage:       "create missing docs and update outdated docs",
			// 	Destination: &conf.Sync,
			// 	Aliases:     []string{"S"},
			// },
			&cli.BoolFlag{
				Name:        "force", // conflicts to proceed
				Usage:       "continue reindexing even when conflicts happen",
				Destination: &conf.Force,
				Aliases:     []string{"f"},
			},
			&cli.Float64Flag{
				Name:        "requests-per-second",
				Usage:       "the maximum number of documents to index per second (-1 turns off throttling)",
				Destination: &conf.RequestsPerSecond,
				Aliases:     []string{"R"},
			},
			&cli.Int64Flag{
				Name:        "max-docs",
				Usage:       "the maximum number of documents to reindex",
				Destination: &conf.MaxDocs,
				Aliases:     []string{"m"},
			},
			&cli.DurationFlag{
				Name:        "timeout",
				Usage:       "timeout for write operations (e.g. 300m or 120s)",
				Destination: &conf.Timeout,
				Aliases:     []string{"T"},
			},
			&cli.BoolFlag{
				Name:        "refresh",
				Usage:       "refresh affected shards to make this operation visible to search",
				Destination: &conf.Refresh,
				Aliases:     []string{"r"},
			},
			&cli.BoolFlag{
				Name:        "wait",
				Usage:       "wait for active shards",
				Destination: &conf.Wait,
				Aliases:     []string{"w"},
			},
			&cli.StringSliceFlag{
				Name:        "source",
				Usage:       "source index (multiple supported)",
				Destination: &conf.SourceIndices,
				Aliases:     []string{"s"},
				Required:    true,
			},
			&cli.StringFlag{
				Name:        "target",
				Usage:       "target index",
				Destination: &conf.Index,
				Aliases:     []string{"t"},
				Required:    true,
			},
		},

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