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"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"go.uber.org/zap"
)

type Storage struct {
	router engine.ChainRouter

	morph handler.MorphRuleChainStorage

	local engine.LocalOverrideStorage

	policy handler.PolicyStorage
}

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

type Contract interface {
	AddChain(kind policycontract.Kind, entity string, name []byte, chain []byte) (util.Uint256, uint32, error)
	GetChain(kind policycontract.Kind, entity string, name []byte) ([]byte, error)
	RemoveChain(kind policycontract.Kind, entity string, name []byte) (util.Uint256, uint32, error)
	ListChains(kind policycontract.Kind, entity string, name []byte) ([][]byte, error)
	Wait(tx util.Uint256, vub uint32, err error) error
}

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

func NewStorage(cfg StorageConfig) *Storage {
	// todo use thread safe inmemory https://git.frostfs.info/TrueCloudLab/policy-engine/issues/35
	local := inmemory.NewInmemoryLocalStorage()

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

	policyStorage := NewMorphPolicyStorage(&MorphPolicyStorageConfig{
		Contract: cfg.Contract,
		Log:      cfg.Log,
	})

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

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) AddChain(target engine.Target, policyChain *chain.Chain) error {
	return s.morph.AddChain(target, policyChain)
}

func (s *Storage) RemoveChain(target engine.Target, chainID chain.ID) error {
	return s.morph.RemoveChain(target, chainID)
}

func (s *Storage) ListChains(target engine.Target) ([]*chain.Chain, error) {
	return s.morph.ListChains(target)
}

func (s *Storage) PutPolicy(namespace string, cnrID cid.ID, policy []byte) error {
	return s.policy.PutPolicy(namespace, cnrID, policy)
}

func (s *Storage) GetPolicy(namespace string, cnrID cid.ID) ([]byte, error) {
	return s.policy.GetPolicy(namespace, cnrID)
}

func (s *Storage) DeletePolicy(namespace string, cnrID cid.ID) error {
	return s.policy.DeletePolicy(namespace, cnrID)
}