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

package overlay

import (
	"time"

	"github.com/zeebo/errs"
	monkit "gopkg.in/spacemonkeygo/monkit.v2"
)

var (
	mon = monkit.Package()
	// Error represents an overlay error
	Error = errs.Class("overlay error")
)

// Config is a configuration struct for everything you need to start the
// Overlay cache responsibility.
type Config struct {
	Node NodeSelectionConfig
}

// NodeSelectionConfig is a configuration struct to determine the minimum
// values for nodes to select
type NodeSelectionConfig struct {
	UptimeRatio       float64       `help:"a node's ratio of being up/online vs. down/offline" releaseDefault:"0.9" devDefault:"0"`
	UptimeCount       int64         `help:"the number of times a node's uptime has been checked to not be considered a New Node" releaseDefault:"500" devDefault:"0"`
	AuditSuccessRatio float64       `help:"a node's ratio of successful audits" releaseDefault:"0.4" devDefault:"0"` // TODO: update after beta
	AuditCount        int64         `help:"the number of times a node has been audited to not be considered a New Node" releaseDefault:"500" devDefault:"0"`
	NewNodePercentage float64       `help:"the percentage of new nodes allowed per request" default:"0.05"` // TODO: fix, this is not percentage, it's ratio
	MinimumVersion    string        `help:"the minimum node software version for node selection queries" default:""`
	OnlineWindow      time.Duration `help:"the amount of time without seeing a node before its considered offline" default:"1h"`
	DistinctIP        bool          `help:"require distinct IPs when choosing nodes for upload" releaseDefault:"true" devDefault:"false"`

	AuditReputationRepairWeight float64 `help:"weight to apply to audit reputation for total repair reputation calculation" default:"1.0"`
	AuditReputationUplinkWeight float64 `help:"weight to apply to audit reputation for total uplink reputation calculation" default:"1.0"`
	AuditReputationAlpha0       float64 `help:"the initial shape 'alpha' used to calculate audit SNs reputation" default:"1.0"`
	AuditReputationBeta0        float64 `help:"the initial shape 'beta' value used to calculate audit SNs reputation" default:"0.0"`
	AuditReputationLambda       float64 `help:"the forgetting factor used to calculate the audit SNs reputation" default:"1.0"`
	AuditReputationWeight       float64 `help:"the normalization weight used to calculate the audit SNs reputation" default:"1.0"`
	// TODO(nat): figure out default for DQs
	AuditReputationDQ            float64 `help:"the reputation cut-off for disqualifying SNs based on audit history" default:"0.5"`
	UptimeReputationRepairWeight float64 `help:"weight to apply to uptime reputation for total repair reputation calculation" default:"1.0"`
	UptimeReputationUplinkWeight float64 `help:"weight to apply to uptime reputation for total uplink reputation calculation" default:"1.0"`
	UptimeReputationAlpha0       float64 `help:"the initial shape 'alpha' used to calculate uptime SNs reputation" default:"1.0"`
	UptimeReputationBeta0        float64 `help:"the initial shape 'beta' value used to calculate uptime SNs reputation" default:"0.0"`
	UptimeReputationLambda       float64 `help:"the forgetting factor used to calculate the uptime SNs reputation" default:"1.0"`
	UptimeReputationWeight       float64 `help:"the normalization weight used to calculate the uptime SNs reputation" default:"1.0"`
	UptimeReputationDQ           float64 `help:"the reputation cut-off for disqualifying SNs based on uptime history" default:"0.5"`
}