// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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 aggregation

import (
	api "skywalking.apache.org/repo/goapi/query"

	"github.com/urfave/cli/v2"

	"github.com/apache/skywalking-cli/internal/commands/interceptor"
	"github.com/apache/skywalking-cli/internal/flags"
	"github.com/apache/skywalking-cli/internal/model"
	"github.com/apache/skywalking-cli/pkg/display"
	"github.com/apache/skywalking-cli/pkg/display/displayable"
	"github.com/apache/skywalking-cli/pkg/graphql/metrics"
	"github.com/apache/skywalking-cli/pkg/logger"
)

var SortedMetrics = &cli.Command{
	Name:      "sorted",
	Usage:     "query the top <n> entities sorted by the specified metrics",
	ArgsUsage: "<n>",
	UsageText: `Query the top <n> entities sorted by the specified metrics.

Examples:
1. Query the top 5 services whose sla are largest:
$ swctl metrics sorted --name service_sla 5

2. Query the top 5 endpoints whose sla is largest:
$ swctl metrics sorted --name endpoint_sla 5

3. Query the top 5 instances of service "boutique::adservice" whose sla are largest:
$ swctl metrics sorted --name service_instance_sla --service-name boutique::adservice 5
`,
	Flags: flags.Flags(
		flags.DurationFlags,
		flags.MetricsFlags,
		flags.ServiceFlags,
		[]cli.Flag{
			&cli.GenericFlag{
				Name:  "order",
				Usage: "the `order` by which the top entities are sorted",
				Value: &model.OrderEnumValue{
					Enum:     api.AllOrder,
					Default:  api.OrderDes,
					Selected: api.OrderDes,
				},
			},
		},
	),
	Before: interceptor.BeforeChain(
		interceptor.DurationInterceptor,
		interceptor.ParseService(false),
	),
	Action: func(ctx *cli.Context) error {
		condition, duration, err := buildSortedCondition(ctx, true)
		if err != nil {
			return err
		}

		logger.Log.Debugln(condition.Name, condition.Scope, condition.TopN)
		metricsValues, err := metrics.SortMetrics(ctx.Context, *condition, *duration)
		if err != nil {
			return err
		}

		return display.Display(ctx.Context, &displayable.Displayable{Data: metricsValues})
	},
}
