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

package metrics

import (
	"context"
	"time"

	"github.com/spacemonkeygo/monkit/v3"
	"github.com/zeebo/errs"
	"go.uber.org/zap"

	"storj.io/common/sync2"
	"storj.io/storj/satellite/metabase/metaloop"
)

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 {
}

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

// NewChore creates a new instance of the metrics chore.
func NewChore(log *zap.Logger, config Config, loop *metaloop.Service) *Chore {
	return &Chore{
		log:    log,
		config: config,
		// This chore monitors metainfo loop, so it's fine to use very small cycle time.
		Loop:         sync2.NewCycle(time.Nanosecond),
		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.Monitor(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.InlineObjectCount())
		mon.IntVal("total_object_count").Observe(chore.Counter.ObjectCount)

		return nil
	})
}

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