// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package metrics

import (
	"context"
	"time"

	"github.com/zeebo/errs"
	"go.uber.org/zap"
	"gopkg.in/spacemonkeygo/monkit.v2"

	"storj.io/common/sync2"
	"storj.io/storj/satellite/metainfo"
)

var (
	// Error defines the metrics chore errors class.
	Error = errs.Class("metrics chore error")
	mon   = monkit.Package()
)

// Config contains configurable values for metrics collection.
type Config struct {
	ChoreInterval time.Duration `help:"the time between each metrics chore run" releaseDefault:"15m" devDefault:"15m"`
}

// Chore implements the metrics chore.
//
// architecture: Chore
type Chore struct {
	log          *zap.Logger
	config       Config
	Loop         sync2.Cycle
	metainfoLoop *metainfo.Loop
	Counter      *Counter
}

// NewChore creates a new instance of the metrics chore.
func NewChore(log *zap.Logger, config Config, loop *metainfo.Loop) *Chore {
	return &Chore{
		log:          log,
		config:       config,
		Loop:         *sync2.NewCycle(config.ChoreInterval),
		metainfoLoop: loop,
	}
}

// Run starts the metrics chore.
func (chore *Chore) Run(ctx context.Context) (err error) {
	defer mon.Task()(&ctx)(&err)

	return chore.Loop.Run(ctx, func(ctx context.Context) (err error) {
		defer mon.Task()(&ctx)(&err)

		chore.Counter = NewCounter()

		err = chore.metainfoLoop.Join(ctx, chore.Counter)
		if err != nil {
			chore.log.Error("error joining metainfoloop", zap.Error(err))
			return nil
		}
		mon.IntVal("remote_dependent_object_count").Observe(chore.Counter.RemoteDependent)
		mon.IntVal("inline_object_count").Observe(chore.Counter.Inline)
		mon.IntVal("total_object_count").Observe(chore.Counter.Total)

		return nil
	})
}

// Close closes metrics chore.
func (chore *Chore) Close() error {
	chore.Loop.Close()
	return nil
}