package netmap

import (
	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
)

// PlacementPolicy represents v2-compatible placement policy.
type PlacementPolicy netmap.PlacementPolicy

// NewPlacementPolicy creates and returns new PlacementPolicy instance.
func NewPlacementPolicy() *PlacementPolicy {
	return NewPlacementPolicyFromV2(new(netmap.PlacementPolicy))
}

// NewPlacementPolicyFromV2 converts v2 PlacementPolicy to PlacementPolicy.
//
// Nil netmap.PlacementPolicy converts to nil.
func NewPlacementPolicyFromV2(f *netmap.PlacementPolicy) *PlacementPolicy {
	return (*PlacementPolicy)(f)
}

// ToV2 converts PlacementPolicy to v2 PlacementPolicy.
//
// Nil PlacementPolicy converts to nil.
func (p *PlacementPolicy) ToV2() *netmap.PlacementPolicy {
	return (*netmap.PlacementPolicy)(p)
}

// Replicas returns list of object replica descriptors.
func (p *PlacementPolicy) Replicas() []*Replica {
	rs := (*netmap.PlacementPolicy)(p).
		GetReplicas()

	res := make([]*Replica, 0, len(rs))

	for i := range rs {
		res = append(res, NewReplicaFromV2(rs[i]))
	}

	return res
}

// SetReplicas sets list of object replica descriptors.
func (p *PlacementPolicy) SetReplicas(rs ...*Replica) {
	var rsV2 []*netmap.Replica

	if rs != nil {
		rsV2 = make([]*netmap.Replica, 0, len(rs))

		for i := range rs {
			rsV2 = append(rsV2, rs[i].ToV2())
		}
	}

	(*netmap.PlacementPolicy)(p).
		SetReplicas(rsV2)
}

// ContainerBackupFactor returns container backup factor.
func (p *PlacementPolicy) ContainerBackupFactor() uint32 {
	return (*netmap.PlacementPolicy)(p).
		GetContainerBackupFactor()
}

// SetContainerBackupFactor sets container backup factor.
func (p *PlacementPolicy) SetContainerBackupFactor(f uint32) {
	(*netmap.PlacementPolicy)(p).
		SetContainerBackupFactor(f)
}

// Selector returns set of selectors to form the container's nodes subset.
func (p *PlacementPolicy) Selectors() []*Selector {
	rs := (*netmap.PlacementPolicy)(p).
		GetSelectors()

	res := make([]*Selector, 0, len(rs))

	for i := range rs {
		res = append(res, NewSelectorFromV2(rs[i]))
	}

	return res
}

// SetSelectors sets set of selectors to form the container's nodes subset.
func (p *PlacementPolicy) SetSelectors(ss ...*Selector) {
	var ssV2 []*netmap.Selector

	if ss != nil {
		ssV2 = make([]*netmap.Selector, 0, len(ss))

		for i := range ss {
			ssV2 = append(ssV2, ss[i].ToV2())
		}
	}

	(*netmap.PlacementPolicy)(p).
		SetSelectors(ssV2)
}

// Filters returns list of named filters to reference in selectors.
func (p *PlacementPolicy) Filters() []*Filter {
	return filtersFromV2(
		(*netmap.PlacementPolicy)(p).
			GetFilters(),
	)
}

// SetFilters sets list of named filters to reference in selectors.
func (p *PlacementPolicy) SetFilters(fs ...*Filter) {
	(*netmap.PlacementPolicy)(p).
		SetFilters(filtersToV2(fs))
}

// Marshal marshals PlacementPolicy into a protobuf binary form.
//
// Buffer is allocated when the argument is empty.
// Otherwise, the first buffer is used.
func (p *PlacementPolicy) Marshal(b ...[]byte) ([]byte, error) {
	var buf []byte
	if len(b) > 0 {
		buf = b[0]
	}

	return (*netmap.PlacementPolicy)(p).
		StableMarshal(buf)
}

// Unmarshal unmarshals protobuf binary representation of PlacementPolicy.
func (p *PlacementPolicy) Unmarshal(data []byte) error {
	return (*netmap.PlacementPolicy)(p).
		Unmarshal(data)
}

// MarshalJSON encodes PlacementPolicy to protobuf JSON format.
func (p *PlacementPolicy) MarshalJSON() ([]byte, error) {
	return (*netmap.PlacementPolicy)(p).
		MarshalJSON()
}

// UnmarshalJSON decodes PlacementPolicy from protobuf JSON format.
func (p *PlacementPolicy) UnmarshalJSON(data []byte) error {
	return (*netmap.PlacementPolicy)(p).
		UnmarshalJSON(data)
}