package getsvc

import (
	"context"
	"errors"

	objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
	clientcore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/netmap"
	objectSvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object"
	getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
	objutil "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	"go.uber.org/zap"
)

// Service implements Get operation of Object service v2.
type Service struct {
	*cfg
}

// Option represents Service constructor option.
type Option func(*cfg)

type epochSource interface {
	Epoch() (uint64, error)
}

type clientSource interface {
	Get(info clientcore.NodeInfo) (clientcore.MultiAddressClient, error)
}

type cfg struct {
	svc *getsvc.Service

	keyStorage *objutil.KeyStorage

	epochSource epochSource

	clientSource clientSource

	netmapSource netmap.Source

	announcedKeys netmap.AnnouncedKeys

	contSource container.Source

	log *logger.Logger
}

// NewService constructs Service instance from provided options.
func NewService(opts ...Option) *Service {
	c := new(cfg)

	for i := range opts {
		opts[i](c)
	}

	return &Service{
		cfg: c,
	}
}

// Get calls internal service and returns v2 object stream.
func (s *Service) Get(req *objectV2.GetRequest, stream objectSvc.GetObjectStream) error {
	p, err := s.toPrm(req, stream)
	if err != nil {
		return err
	}

	err = s.svc.Get(stream.Context(), *p)

	var splitErr *objectSDK.SplitInfoError

	switch {
	case errors.As(err, &splitErr):
		return stream.Send(splitInfoResponse(splitErr.SplitInfo()))
	default:
		return err
	}
}

// GetRange calls internal service and returns v2 payload range stream.
func (s *Service) GetRange(req *objectV2.GetRangeRequest, stream objectSvc.GetObjectRangeStream) error {
	p, err := s.toRangePrm(req, stream)
	if err != nil {
		return err
	}

	err = s.svc.GetRange(stream.Context(), *p)

	var splitErr *objectSDK.SplitInfoError

	switch {
	case errors.As(err, &splitErr):
		return stream.Send(splitInfoRangeResponse(splitErr.SplitInfo()))
	default:
		return err
	}
}

// Head serves ForstFS API v2 compatible HEAD requests.
func (s *Service) Head(ctx context.Context, req *objectV2.HeadRequest) (*objectV2.HeadResponse, error) {
	resp := new(objectV2.HeadResponse)
	resp.SetBody(new(objectV2.HeadResponseBody))

	p, err := s.toHeadPrm(req, resp)
	if err != nil {
		return nil, err
	}

	err = s.svc.Head(ctx, *p)

	var splitErr *objectSDK.SplitInfoError

	if errors.As(err, &splitErr) {
		setSplitInfoHeadResponse(splitErr.SplitInfo(), resp)
		err = nil
	}

	return resp, err
}

func WithInternalService(v *getsvc.Service) Option {
	return func(c *cfg) {
		c.svc = v
	}
}

// WithKeyStorage returns option to set local private key storage.
func WithKeyStorage(ks *objutil.KeyStorage) Option {
	return func(c *cfg) {
		c.keyStorage = ks
	}
}

func WithEpochSource(es epochSource) Option {
	return func(c *cfg) {
		c.epochSource = es
	}
}

func WithClientSource(cs clientSource) Option {
	return func(c *cfg) {
		c.clientSource = cs
	}
}

func WithNetmapSource(ns netmap.Source) Option {
	return func(c *cfg) {
		c.netmapSource = ns
	}
}

func WithNetmapAnnouncedKeys(ak netmap.AnnouncedKeys) Option {
	return func(c *cfg) {
		c.announcedKeys = ak
	}
}

func WithContainerSource(cs container.Source) Option {
	return func(c *cfg) {
		c.contSource = cs
	}
}

func WithLogger(l *logger.Logger) Option {
	return func(c *cfg) {
		c.log = &logger.Logger{Logger: l.With(zap.String("component", "Object.Get V2 service"))}
	}
}