package policy

import (
	policycontract "git.frostfs.info/TrueCloudLab/frostfs-contract/policy"
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/handler"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine/inmemory"
	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/resource"
	"go.uber.org/zap"
)

type Storage struct {
	router engine.ChainRouter

	morph *MorphRuleChainStorage

	local engine.LocalOverrideStorage
}

type StorageConfig struct {
	Contract Contract
	Cache    *cache.MorphPolicyCache
	Log      *zap.Logger
}

type MultiTransaction interface {
	AddChain(entity policycontract.Kind, entityName string, name []byte, chain []byte)
	RemoveChain(entity policycontract.Kind, entityName string, name []byte)
	Scripts() ([][]byte, error)
}

type Contract interface {
	GetChain(entity policycontract.Kind, entityName string, name []byte) ([]byte, error)
	ListChains(entity policycontract.Kind, entityName string, prefix []byte) ([][]byte, error)

	StartTx() MultiTransaction
	SendTx(transaction MultiTransaction) error
}

var _ handler.APE = (*Storage)(nil)

func NewStorage(cfg StorageConfig) *Storage {
	local := inmemory.NewInmemoryLocalStorage()

	morph := NewMorphRuleChainStorage(&MorphRuleChainStorageConfig{
		Contract: cfg.Contract,
		Cache:    cfg.Cache,
		Log:      cfg.Log,
	})

	return &Storage{
		router: engine.NewDefaultChainRouterWithLocalOverrides(morph, local),
		morph:  morph,
		local:  local,
	}
}

func (s *Storage) IsAllowed(name chain.Name, target engine.RequestTarget, r resource.Request) (status chain.Status, found bool, err error) {
	return s.router.IsAllowed(name, target, r)
}

func (s *Storage) LocalStorage() engine.LocalOverrideStorage {
	return s.local
}

func (s *Storage) PutBucketPolicy(ns string, cnrID cid.ID, policy []byte, policyChains []*chain.Chain) error {
	return s.morph.PutBucketPolicy(ns, cnrID, policy, policyChains)
}

func (s *Storage) DeleteBucketPolicy(ns string, cnrID cid.ID, chainIDs []chain.ID) error {
	return s.morph.DeleteBucketPolicy(ns, cnrID, chainIDs)
}

func (s *Storage) GetBucketPolicy(ns string, cnrID cid.ID) ([]byte, error) {
	return s.morph.GetBucketPolicy(ns, cnrID)
}

func (s *Storage) SaveACLChains(ns string, chains []*chain.Chain) error {
	return s.morph.SaveACLChains(ns, chains)
}