package policy

import (
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
	"go.uber.org/zap"
)

type CachedMorph struct {
	morph engine.MorphRuleChainStorage
	cache *cache.MorphPolicyCache
	log   *zap.Logger
}

type CachedMorphConfig struct {
	Morph engine.MorphRuleChainStorage
	Cache *cache.MorphPolicyCache
	Log   *zap.Logger
}

var _ engine.MorphRuleChainStorage = (*CachedMorph)(nil)

func NewCachedMorph(config CachedMorphConfig) *CachedMorph {
	return &CachedMorph{
		morph: config.Morph,
		cache: config.Cache,
		log:   config.Log,
	}
}

func (c *CachedMorph) AddMorphRuleChain(name chain.Name, target engine.Target, policyChain *chain.Chain) error {
	c.cache.Delete(cache.MorphPolicyCacheKey{Target: target, Name: name})
	return c.morph.AddMorphRuleChain(name, target, policyChain)
}

func (c *CachedMorph) RemoveMorphRuleChain(name chain.Name, target engine.Target, chainID chain.ID) error {
	c.cache.Delete(cache.MorphPolicyCacheKey{Target: target, Name: name})
	return c.morph.RemoveMorphRuleChain(name, target, chainID)
}

func (c *CachedMorph) ListMorphRuleChains(name chain.Name, target engine.Target) ([]*chain.Chain, error) {
	key := cache.MorphPolicyCacheKey{Target: target, Name: name}
	list := c.cache.Get(key)
	if list != nil {
		return list, nil
	}

	list, err := c.morph.ListMorphRuleChains(name, target)
	if err != nil {
		return nil, err
	}

	if err = c.cache.Put(key, list); err != nil {
		c.log.Warn(logs.CouldntCacheListPolicyChains)
	}

	return list, nil
}