package control

import (
	"fmt"

	rawclient "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/key"
	commonCmd "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control"
	"github.com/mr-tron/base58"
	"github.com/spf13/cobra"
)

const (
	fillPercentFlag = "fill_percent"
)

var shardsRebuildCmd = &cobra.Command{
	Use:   "rebuild",
	Short: "Rebuild shards",
	Long:  "Rebuild reclaims storage occupied by dead objects and adjusts the storage structure according to the configuration (for blobovnicza only now)",
	Run:   shardsRebuild,
}

func shardsRebuild(cmd *cobra.Command, _ []string) {
	pk := key.Get(cmd)

	req := &control.StartShardRebuildRequest{
		Body: &control.StartShardRebuildRequest_Body{
			Shard_ID:          getShardIDList(cmd),
			TargetFillPercent: getFillPercentValue(cmd),
			ConcurrencyLimit:  getConcurrencyValue(cmd),
		},
	}

	signRequest(cmd, pk, req)

	cli := getClient(cmd, pk)

	var resp *control.StartShardRebuildResponse
	var err error
	err = cli.ExecRaw(func(client *rawclient.Client) error {
		resp, err = control.StartShardRebuild(client, req)
		return err
	})
	commonCmd.ExitOnErr(cmd, "rpc error: %w", err)

	verifyResponse(cmd, resp.GetSignature(), resp.GetBody())

	var success, failed uint
	for _, res := range resp.GetBody().GetResults() {
		if res.GetSuccess() {
			success++
			cmd.Printf("Shard %s: OK\n", base58.Encode(res.GetShard_ID()))
		} else {
			failed++
			cmd.Printf("Shard %s: failed with error %q\n", base58.Encode(res.GetShard_ID()), res.GetError())
		}
	}
	cmd.Printf("Total: %d success, %d failed\n", success, failed)
}

func getFillPercentValue(cmd *cobra.Command) uint32 {
	v, _ := cmd.Flags().GetUint32(fillPercentFlag)
	if v <= 0 || v > 100 {
		commonCmd.ExitOnErr(cmd, "invalid fill_percent value", fmt.Errorf("fill_percent value must be (0, 100], current value: %d", v))
	}
	return v
}

func getConcurrencyValue(cmd *cobra.Command) uint32 {
	v, _ := cmd.Flags().GetUint32(concurrencyFlag)
	if v <= 0 || v > 10000 {
		commonCmd.ExitOnErr(cmd, "invalid concurrency value", fmt.Errorf("concurrency value must be (0, 10 000], current value: %d", v))
	}
	return v
}

func initControlShardRebuildCmd() {
	initControlFlags(shardsRebuildCmd)

	flags := shardsRebuildCmd.Flags()
	flags.StringSlice(shardIDFlag, nil, "List of shard IDs in base58 encoding")
	flags.Bool(shardAllFlag, false, "Process all shards")
	flags.Uint32(fillPercentFlag, 80, "Target fill percent to reclaim space")
	flags.Uint32(concurrencyFlag, 20, "Maximum count of concurrently rebuilding files")
	setShardModeCmd.MarkFlagsMutuallyExclusive(shardIDFlag, shardAllFlag)
}