/*
Copyright (c) 2017 VMware, Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package interval

import (
	"context"
	"flag"
	"fmt"

	"github.com/vmware/govmomi/govc/cli"
	"github.com/vmware/govmomi/govc/flags"
	"github.com/vmware/govmomi/govc/metric"
	"github.com/vmware/govmomi/vim25/methods"
	"github.com/vmware/govmomi/vim25/types"
)

type change struct {
	*metric.PerformanceFlag

	enabled *bool
	level   int
}

func init() {
	cli.Register("metric.interval.change", &change{})
}

func (cmd *change) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.PerformanceFlag, ctx = metric.NewPerformanceFlag(ctx)
	cmd.PerformanceFlag.Register(ctx, f)

	f.Var(flags.NewOptionalBool(&cmd.enabled), "enabled", "Enable or disable")
	f.IntVar(&cmd.level, "level", 0, "Level")
}

func (cmd *change) Description() string {
	return `Change historical metric intervals.

Examples:
  govc metric.interval.change -i 300 -level 2
  govc metric.interval.change -i 86400 -enabled=false`
}

func (cmd *change) Process(ctx context.Context) error {
	if err := cmd.PerformanceFlag.Process(ctx); err != nil {
		return err
	}
	return nil
}

func (cmd *change) Run(ctx context.Context, f *flag.FlagSet) error {
	m, err := cmd.Manager(ctx)
	if err != nil {
		return err
	}

	intervals, err := m.HistoricalInterval(ctx)
	if err != nil {
		return err
	}

	interval := cmd.Interval(0)
	if interval == 0 {
		return flag.ErrHelp
	}

	var current *types.PerfInterval

	for _, i := range intervals {
		if i.SamplingPeriod == interval {
			current = &i
			break
		}
	}

	if current == nil {
		return fmt.Errorf("%d interval ID not found", interval)
	}

	if cmd.level != 0 {
		if cmd.level > 4 {
			return flag.ErrHelp
		}
		current.Level = int32(cmd.level)
	}

	if cmd.enabled != nil {
		current.Enabled = *cmd.enabled
	}

	_, err = methods.UpdatePerfInterval(ctx, m.Client(), &types.UpdatePerfInterval{
		This:     m.Reference(),
		Interval: *current,
	})

	return err
}