package cache

import (
	"fmt"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/data"
	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	"github.com/bluele/gcache"
	"go.uber.org/zap"
)

// CORSCache contains cache with CORS objects.
type CORSCache struct {
	cache  gcache.Cache
	logger *zap.Logger
}

const (
	// DefaultCORSCacheSize is a default maximum number of entries in cache.
	DefaultCORSCacheSize = 1e3
	// DefaultCORSCacheLifetime is a default lifetime of entries in cache.
	DefaultCORSCacheLifetime = 5 * time.Minute
)

// DefaultCORSConfig returns new default cache expiration values.
func DefaultCORSConfig(logger *zap.Logger) *Config {
	return &Config{
		Size:     DefaultCORSCacheSize,
		Lifetime: DefaultCORSCacheLifetime,
		Logger:   logger,
	}
}

// NewCORSCache creates an object of CORSCache.
func NewCORSCache(config *Config) *CORSCache {
	gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
	return &CORSCache{cache: gc, logger: config.Logger}
}

// Get returns a cached object.
func (o *CORSCache) Get(cnrID cid.ID) *data.CORSConfiguration {
	entry, err := o.cache.Get(cnrID)
	if err != nil {
		return nil
	}

	result, ok := entry.(*data.CORSConfiguration)
	if !ok {
		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
			zap.String("expected", fmt.Sprintf("%T", result)), logs.TagField(logs.TagDatapath))
		return nil
	}

	return result
}

// Put puts an object to cache.
func (o *CORSCache) Put(cnrID cid.ID, cors *data.CORSConfiguration) error {
	return o.cache.Set(cnrID, cors)
}