/*
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 ClusterReroute(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "reroute",
		Usage:     "manually change the allocation of individual shards in the cluster.",
		UsageText: "reroute <cluster-name>",
		Aliases:   []string{"ctx"},

		Commands: []*cli.Command{
			ClusterRerouteMove(conf),
			ClusterRerouteAllocateReplica(conf),
			ClusterRerouteCancel(conf),
			ClusterRerouteAllocatePrimary(conf, false),
			ClusterRerouteAllocatePrimary(conf, true),
		},
	}
}

func ClusterRerouteMove(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "move",
		Usage:     "move shard to another node",
		UsageText: "move [options] <index>",

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

		Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "shard",
				Usage:       "shard to move",
				Destination: &conf.Shards,
				Aliases:     []string{"s"},
				Required:    true,
			},
			&cli.StringFlag{
				Name:        "from-node",
				Usage:       "current node",
				Destination: &conf.FromNode,
				Aliases:     []string{"f"},
				Required:    true,
			},
			&cli.StringFlag{
				Name:        "to-node",
				Usage:       "node to move to",
				Destination: &conf.ToNode,
				Aliases:     []string{"t"},
				Required:    true,
			},
		},

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

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

func ClusterRerouteAllocateReplica(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "allocate-replica",
		Usage:     "allocate-replica replica to another node",
		UsageText: "allocate-replica [options] <index>",

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

		Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "shard",
				Usage:       "shard to move",
				Destination: &conf.Shards,
				Aliases:     []string{"s"},
				Required:    true,
			},
			&cli.StringFlag{
				Name:        "to-node",
				Usage:       "node to move to",
				Destination: &conf.ToNode,
				Aliases:     []string{"t"},
				Required:    true,
			},
		},

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

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

func ClusterRerouteCancel(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:      "cancel",
		Usage:     "cancel a reroute operation",
		UsageText: "cancel [options] <index>",

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

		Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "shard",
				Usage:       "shard to move",
				Destination: &conf.Shards,
				Aliases:     []string{"s"},
				Required:    true,
			},
			&cli.StringFlag{
				Name:        "to-node",
				Usage:       "node to move to",
				Destination: &conf.ToNode,
				Aliases:     []string{"t"},
				Required:    true,
			},
			&cli.BoolFlag{
				Name:        "allow-primary",
				Usage:       "allow primary shard to cancel",
				Destination: &conf.AllowPrimary,
				Aliases:     []string{"a"},
			},
		},

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

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

func ClusterRerouteAllocatePrimary(conf *cfg.Config, stale bool) *cli.Command {
	name := "allocate-empty-primary"
	usage := "allocate an empty primary shard to a node"

	if stale {
		name = "allocate-stale-primary"
		usage = "allocate a stale primary shard to a node"

	}

	return &cli.Command{
		Name:      name,
		Usage:     usage,
		UsageText: name + " [options] <index>",

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

		Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "shard",
				Usage:       "shard to move",
				Destination: &conf.Shards,
				Aliases:     []string{"s"},
				Required:    true,
			},
			&cli.StringFlag{
				Name:        "to-node",
				Usage:       "node to move to",
				Destination: &conf.ToNode,
				Aliases:     []string{"t"},
				Required:    true,
			},
			&cli.BoolFlag{
				Name:        "accept-data-loss",
				Usage:       "",
				Destination: &conf.AcceptDataLoss,
				Aliases:     []string{"a"},
				Required:    true,
			},
		},

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

			return es.ClusterRerouteAllocatePrimary(conf, index, stale)
		},
	}
}