// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"context"
	"errors"
	"strconv"
	"strings"

	"github.com/fatih/color"
	"github.com/minio/cli"
	json "github.com/minio/colorjson"
	"github.com/minio/mc/pkg/probe"
	"github.com/minio/minio-go/v7/pkg/replication"
	"github.com/minio/pkg/console"
)

var replicateListFlags = []cli.Flag{
	cli.StringFlag{
		Name:  "status",
		Usage: "show rules by status. Valid options are [enabled,disabled]",
	},
}

var replicateListCmd = cli.Command{
	Name:         "ls",
	Usage:        "list server side replication configuration rules",
	Action:       mainReplicateList,
	OnUsageError: onUsageError,
	Before:       setGlobalsFromContext,
	Flags:        append(globalFlags, replicateListFlags...),
	CustomHelpTemplate: `NAME:
  {{.HelpName}} - {{.Usage}}
	 
USAGE:
  {{.HelpName}} TARGET
	 
FLAGS:
  {{range .VisibleFlags}}{{.}}
  {{end}}
EXAMPLES:
  1. List server side replication configuration rules on bucket "mybucket" for alias "myminio".
     {{.Prompt}} {{.HelpName}} myminio/mybucket
`,
}

// checkReplicateListSyntax - validate all the passed arguments
func checkReplicateListSyntax(ctx *cli.Context) {
	if len(ctx.Args()) != 1 {
		cli.ShowCommandHelpAndExit(ctx, "ls", 1) // last argument is exit code
	}
}

func printReplicateListHeader() {
	if globalJSON {
		return
	}
	idFieldMaxLen := 20
	priorityFieldMaxLen := 8
	statusFieldMaxLen := 8
	prefixFieldMaxLen := 25
	tagsFieldMaxLen := 25
	scFieldMaxLen := 15
	destBucketFieldMaxLen := 20
	console.Println(console.Colorize("Headers", newPrettyTable(" | ",
		Field{"ID", idFieldMaxLen},
		Field{"Priority", priorityFieldMaxLen},
		Field{"Status", statusFieldMaxLen},
		Field{"Prefix", prefixFieldMaxLen},
		Field{"Tags", tagsFieldMaxLen},
		Field{"DestBucket", destBucketFieldMaxLen},
		Field{"StorageClass", scFieldMaxLen},
	).buildRow("ID", "Priority", "Status", "Prefix", "Tags", "DestBucket", "StorageClass")))
}

type replicateListMessage struct {
	Op     string           `json:"op"`
	Status string           `json:"status"`
	URL    string           `json:"url"`
	Rule   replication.Rule `json:"rule"`
}

func (l replicateListMessage) JSON() string {
	l.Status = "success"
	jsonMessageBytes, e := json.MarshalIndent(l, "", " ")
	fatalIf(probe.NewError(e), "Unable to marshal into JSON.")
	return string(jsonMessageBytes)
}

func (l replicateListMessage) String() string {
	idFieldMaxLen := 20
	priorityFieldMaxLen := 8
	statusFieldMaxLen := 8
	prefixFieldMaxLen := 25
	tagsFieldMaxLen := 25
	scFieldMaxLen := 15
	destBucketFieldMaxLen := 20
	r := l.Rule
	return console.Colorize("replicateListMessage", newPrettyTable(" | ",
		Field{"ID", idFieldMaxLen},
		Field{"Priority", priorityFieldMaxLen},
		Field{"Status", statusFieldMaxLen},
		Field{"Prefix", prefixFieldMaxLen},
		Field{"Tags", tagsFieldMaxLen},
		Field{"DestBucket", destBucketFieldMaxLen},
		Field{"StorageClass", scFieldMaxLen},
	).buildRow(r.ID, strconv.Itoa(r.Priority), string(r.Status), r.Filter.And.Prefix, r.Tags(), r.Destination.Bucket, r.Destination.StorageClass))
}

func mainReplicateList(cliCtx *cli.Context) error {
	ctx, cancelReplicateList := context.WithCancel(globalContext)
	defer cancelReplicateList()

	console.SetColor("Headers", color.New(color.Bold, color.FgHiGreen))

	checkReplicateListSyntax(cliCtx)

	// Get the alias parameter from cli
	args := cliCtx.Args()
	aliasedURL := args.Get(0)
	// Create a new Client
	client, err := newClient(aliasedURL)
	fatalIf(err, "Unable to initialize connection.")
	rCfg, err := client.GetReplication(ctx)
	fatalIf(err.Trace(args...), "Unable to get replication configuration")

	if rCfg.Empty() {
		fatalIf(probe.NewError(errors.New("replication configuration not set")).Trace(aliasedURL),
			"Unable to list replication configuration")
	}
	printReplicateListHeader()
	statusFlag := cliCtx.String("status")
	for _, rule := range rCfg.Rules {
		if statusFlag == "" || strings.EqualFold(statusFlag, string(rule.Status)) {
			printMsg(replicateListMessage{
				Rule: rule,
			})
		}
	}

	return nil
}
