/*
Real-time Charging System for Telecom & ISP environments
Copyright (C) 2012-2014 ITsysCOM GmbH

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>
*/

package engine

import (
	"bytes"
	"compress/zlib"
	"errors"
	"fmt"

	"github.com/cgrates/cgrates/cache2go"
	"github.com/cgrates/cgrates/utils"
	"github.com/hoisie/redis"

	"io/ioutil"
	"time"
)

type RedisStorage struct {
	dbNb int
	db   *redis.Client
	ms   Marshaler
}

func NewRedisStorage(address string, db int, pass, mrshlerStr string) (*RedisStorage, error) {
	ndb := &redis.Client{Addr: address, Db: db}
	if pass != "" {
		if err := ndb.Auth(pass); err != nil {
			return nil, err
		}
	}

	var mrshler Marshaler
	if mrshlerStr == utils.MSGPACK {
		mrshler = NewCodecMsgpackMarshaler()
	} else if mrshlerStr == utils.JSON {
		mrshler = new(JSONMarshaler)
	} else {
		return nil, fmt.Errorf("Unsupported marshaler: %v", mrshlerStr)
	}
	return &RedisStorage{db: ndb, dbNb: db, ms: mrshler}, nil
}

func (rs *RedisStorage) Close() {
	// no close for me
	//rs.db.Quit()
}

func (rs *RedisStorage) Flush() (err error) {
	err = rs.db.Flush(false)
	return
}

func (rs *RedisStorage) CacheRating(dKeys, rpKeys, rpfKeys, alsKeys, lcrKeys []string) (err error) {
	if dKeys == nil {
		Logger.Info("Caching all destinations")
		if dKeys, err = rs.db.Keys(DESTINATION_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(DESTINATION_PREFIX)
	} else if len(dKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching destinations: %v", dKeys))
		CleanStalePrefixes(dKeys)
	}
	for _, key := range dKeys {
		if _, err = rs.GetDestination(key[len(DESTINATION_PREFIX):]); err != nil {
			return err
		}
	}
	if len(dKeys) != 0 {
		Logger.Info("Finished destinations caching.")
	}
	if rpKeys == nil {
		Logger.Info("Caching all rating plans")
		if rpKeys, err = rs.db.Keys(RATING_PLAN_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(RATING_PLAN_PREFIX)
	} else if len(rpKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching rating plans: %v", rpKeys))
	}
	for _, key := range rpKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetRatingPlan(key[len(RATING_PLAN_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(rpKeys) != 0 {
		Logger.Info("Finished rating plans caching.")
	}
	if rpfKeys == nil {
		Logger.Info("Caching all rating profiles")
		if rpfKeys, err = rs.db.Keys(RATING_PROFILE_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(RATING_PROFILE_PREFIX)
	} else if len(rpfKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching rating profile: %v", rpfKeys))
	}
	for _, key := range rpfKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetRatingProfile(key[len(RATING_PROFILE_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(rpfKeys) != 0 {
		Logger.Info("Finished rating profile caching.")
	}
	if lcrKeys == nil {
		Logger.Info("Caching LCRs")
		if lcrKeys, err = rs.db.Keys(LCR_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(LCR_PREFIX)
	} else if len(lcrKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching LCR: %v", lcrKeys))
	}
	for _, key := range lcrKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetLCR(key[len(LCR_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(lcrKeys) != 0 {
		Logger.Info("Finished rating profile caching.")
	}
	if alsKeys == nil {
		Logger.Info("Caching rating profile aliases")
		if alsKeys, err = rs.db.Keys(RP_ALIAS_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(RP_ALIAS_PREFIX)
	} else if len(alsKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching rating profile aliases: %v", alsKeys))
	}
	for _, key := range alsKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetRpAlias(key[len(RP_ALIAS_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(alsKeys) != 0 {
		Logger.Info("Finished rating profile aliases caching.")
	}
	return
}

func (rs *RedisStorage) CacheAccounting(actKeys, shgKeys, alsKeys, dcsKeys []string) (err error) {
	if actKeys == nil {
		cache2go.RemPrefixKey(ACTION_PREFIX)
	}
	if actKeys == nil {
		Logger.Info("Caching all actions")
		if actKeys, err = rs.db.Keys(ACTION_PREFIX + "*"); err != nil {
			return
		}
	} else if len(actKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching actions: %v", actKeys))
	}
	for _, key := range actKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetActions(key[len(ACTION_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(actKeys) != 0 {
		Logger.Info("Finished actions caching.")
	}
	if shgKeys == nil {
		cache2go.RemPrefixKey(SHARED_GROUP_PREFIX)
	}
	if shgKeys == nil {
		Logger.Info("Caching all shared groups")
		if shgKeys, err = rs.db.Keys(SHARED_GROUP_PREFIX + "*"); err != nil {
			return
		}
	} else if len(shgKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching shared groups: %v", shgKeys))
	}
	for _, key := range shgKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetSharedGroup(key[len(SHARED_GROUP_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(shgKeys) != 0 {
		Logger.Info("Finished shared groups caching.")
	}
	if alsKeys == nil {
		Logger.Info("Caching account aliases")
		if alsKeys, err = rs.db.Keys(ACC_ALIAS_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(ACC_ALIAS_PREFIX)
	} else if len(alsKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching account aliases: %v", alsKeys))
	}
	for _, key := range alsKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetAccAlias(key[len(ACC_ALIAS_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(alsKeys) != 0 {
		Logger.Info("Finished account aliases caching.")
	}
	// DerivedChargers caching
	if dcsKeys == nil {
		Logger.Info("Caching all derived chargers")
		if dcsKeys, err = rs.db.Keys(DERIVEDCHARGERS_PREFIX + "*"); err != nil {
			return
		}
		cache2go.RemPrefixKey(DERIVEDCHARGERS_PREFIX)
	} else if len(dcsKeys) != 0 {
		Logger.Info(fmt.Sprintf("Caching derived chargers: %v", dcsKeys))
	}
	for _, key := range dcsKeys {
		cache2go.RemKey(key)
		if _, err = rs.GetDerivedChargers(key[len(DERIVEDCHARGERS_PREFIX):], true); err != nil {
			return err
		}
	}
	if len(dcsKeys) != 0 {
		Logger.Info("Finished derived chargers caching.")
	}
	return nil
}

// Used to check if specific subject is stored using prefix key attached to entity
func (rs *RedisStorage) HasData(category, subject string) (bool, error) {
	switch category {
	case DESTINATION_PREFIX, RATING_PLAN_PREFIX, RATING_PROFILE_PREFIX, ACTION_PREFIX, ACTION_TIMING_PREFIX, ACCOUNT_PREFIX:
		return rs.db.Exists(category + subject)
	}
	return false, errors.New("Unsupported category in ExistsData")
}

func (rs *RedisStorage) GetRatingPlan(key string, checkDb bool) (rp *RatingPlan, err error) {
	key = RATING_PLAN_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(*RatingPlan), nil
	}
	if !checkDb {
		return nil, errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		b := bytes.NewBuffer(values)
		r, err := zlib.NewReader(b)
		if err != nil {
			return nil, err
		}
		out, err := ioutil.ReadAll(r)
		if err != nil {
			return nil, err
		}
		r.Close()
		rp = new(RatingPlan)
		err = rs.ms.Unmarshal(out, rp)
		cache2go.Cache(key, rp)
	}
	return
}

func (rs *RedisStorage) SetRatingPlan(rp *RatingPlan) (err error) {
	result, err := rs.ms.Marshal(rp)
	var b bytes.Buffer
	w := zlib.NewWriter(&b)
	w.Write(result)
	w.Close()
	err = rs.db.Set(RATING_PLAN_PREFIX+rp.Id, b.Bytes())
	if err == nil && historyScribe != nil {
		response := 0
		go historyScribe.Record(rp.GetHistoryRecord(), &response)
	}
	//cache2go.Cache(RATING_PLAN_PREFIX+rp.Id, rp)
	return
}

func (rs *RedisStorage) GetRatingProfile(key string, checkDb bool) (rpf *RatingProfile, err error) {
	key = RATING_PROFILE_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(*RatingProfile), nil
	}
	if !checkDb {
		return nil, errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		rpf = new(RatingProfile)
		err = rs.ms.Unmarshal(values, rpf)
		cache2go.Cache(key, rpf)
	}
	return
}

func (rs *RedisStorage) SetRatingProfile(rpf *RatingProfile) (err error) {
	result, err := rs.ms.Marshal(rpf)
	err = rs.db.Set(RATING_PROFILE_PREFIX+rpf.Id, result)
	if err == nil && historyScribe != nil {
		response := 0
		go historyScribe.Record(rpf.GetHistoryRecord(), &response)
	}
	//cache2go.Cache(RATING_PROFILE_PREFIX+rpf.Id, rpf)
	return
}

func (rs *RedisStorage) GetRpAlias(key string, checkDb bool) (alias string, err error) {

	key = RP_ALIAS_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(string), nil
	}
	if !checkDb {
		return "", errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		alias = string(values)
		cache2go.Cache(key, alias)
	}
	return
}

func (rs *RedisStorage) SetRpAlias(key, alias string) (err error) {
	err = rs.db.Set(RP_ALIAS_PREFIX+key, []byte(alias))
	return
}

// Returns the aliases of one specific rating profile subject on a tenant
func (rs *RedisStorage) RemoveRpAliases(accounts []string) (err error) {
	if alsKeys, err := rs.db.Keys(RP_ALIAS_PREFIX + "*"); err != nil {
		return err
	} else {
		for _, key := range alsKeys {
			alias, err := rs.GetRpAlias(key[len(RP_ALIAS_PREFIX):], true)
			if err != nil {
				return err
			}
			if utils.IsSliceMember(accounts, alias) {
				if _, err = rs.db.Del(key); err != nil {
					return err
				}
			}
		}
	}

	return
}

func (rs *RedisStorage) GetRPAliases(tenant, subject string) (aliases []string, err error) {
	alsKeys, err := rs.db.Keys(RP_ALIAS_PREFIX + "*")
	if err != nil {
		return nil, err
	}
	for _, key := range alsKeys {
		tenantPrfx := RP_ALIAS_PREFIX + tenant + utils.CONCATENATED_KEY_SEP
		if len(key) < len(tenantPrfx) || tenantPrfx != key[:len(tenantPrfx)] { // filter out the tenant for accounts
			continue
		}
		if alsSubj, err := rs.GetRpAlias(key[len(ACC_ALIAS_PREFIX):], true); err != nil {
			return nil, err
		} else if alsSubj == subject {
			alsFromKey := key[len(tenantPrfx):] // take out the alias out of key+tenant
			aliases = append(aliases, alsFromKey)
		}
	}
	return aliases, nil
}

func (rs *RedisStorage) GetLCR(key string, checkDb bool) (lcr *LCR, err error) {
	key = LCR_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(*LCR), nil
	}
	if !checkDb {
		return nil, errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		err = rs.ms.Unmarshal(values, &lcr)
		cache2go.Cache(key, lcr)
	}
	return
}

func (rs *RedisStorage) SetLCR(lcr *LCR) (err error) {
	result, err := rs.ms.Marshal(lcr)
	err = rs.db.Set(LCR_PREFIX+lcr.GetId(), result)
	cache2go.Cache(LCR_PREFIX+lcr.GetId(), lcr)
	return
}

func (rs *RedisStorage) GetAccAlias(key string, checkDb bool) (alias string, err error) {
	key = ACC_ALIAS_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(string), nil
	}
	if !checkDb {
		return "", errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		alias = string(values)
		cache2go.Cache(key, alias)
	}
	return
}

// Adds one alias for one account
func (rs *RedisStorage) SetAccAlias(key, alias string) (err error) {
	err = rs.db.Set(ACC_ALIAS_PREFIX+key, []byte(alias))
	//cache2go.Cache(ALIAS_PREFIX+key, alias)
	return
}

func (rs *RedisStorage) RemoveAccAliases(accounts []string) (err error) {
	if alsKeys, err := rs.db.Keys(ACC_ALIAS_PREFIX + "*"); err != nil {
		return err
	} else {
		for _, key := range alsKeys {
			alias, err := rs.GetAccAlias(key[len(ACC_ALIAS_PREFIX):], true)
			if err != nil {
				return err
			}
			if utils.IsSliceMember(accounts, alias) {
				if _, err = rs.db.Del(key); err != nil {
					return err
				}
			}
		}
	}

	return
}

// Returns the aliases of one specific account on a tenant
func (rs *RedisStorage) GetAccountAliases(tenant, account string) (aliases []string, err error) {
	alsKeys, err := rs.db.Keys(ACC_ALIAS_PREFIX + "*")
	if err != nil {
		return nil, err
	}
	for _, key := range alsKeys {
		tenantPrfx := ACC_ALIAS_PREFIX + tenant + utils.CONCATENATED_KEY_SEP
		if len(key) < len(tenantPrfx) || tenantPrfx != key[:len(tenantPrfx)] { // filter out the tenant for accounts
			continue
		}
		if alsAcnt, err := rs.GetAccAlias(key[len(ACC_ALIAS_PREFIX):], true); err != nil {
			return nil, err
		} else if alsAcnt == account {
			alsFromKey := key[len(tenantPrfx):] // take out the alias out of key+tenant
			aliases = append(aliases, alsFromKey)
		}
	}
	return aliases, nil
}

func (rs *RedisStorage) GetDestination(key string) (dest *Destination, err error) {
	key = DESTINATION_PREFIX + key
	var values []byte
	if values, err = rs.db.Get(key); len(values) > 0 && err == nil {
		b := bytes.NewBuffer(values)
		r, err := zlib.NewReader(b)
		if err != nil {
			return nil, err
		}
		out, err := ioutil.ReadAll(r)
		if err != nil {
			return nil, err
		}
		r.Close()
		dest = new(Destination)
		err = rs.ms.Unmarshal(out, dest)
		// create optimized structure
		for _, p := range dest.Prefixes {
			var ids []string
			if x, err := cache2go.GetCached(DESTINATION_PREFIX + p); err == nil {
				ids = x.([]string)
			}
			ids = append(ids, dest.Id)
			cache2go.Cache(DESTINATION_PREFIX+p, ids)
		}
	} else {
		return nil, errors.New("not found")
	}
	return
}

func (rs *RedisStorage) SetDestination(dest *Destination) (err error) {
	result, err := rs.ms.Marshal(dest)
	if err != nil {
		return err
	}
	var b bytes.Buffer
	w := zlib.NewWriter(&b)
	w.Write(result)
	w.Close()
	err = rs.db.Set(DESTINATION_PREFIX+dest.Id, b.Bytes())
	if err == nil && historyScribe != nil {
		response := 0
		go historyScribe.Record(dest.GetHistoryRecord(), &response)
	}
	//cache2go.Cache(DESTINATION_PREFIX+dest.Id, dest)
	return
}

func (rs *RedisStorage) GetActions(key string, checkDb bool) (as Actions, err error) {
	key = ACTION_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(Actions), nil
	}
	if !checkDb {
		return nil, errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		err = rs.ms.Unmarshal(values, &as)
		cache2go.Cache(key, as)
	}
	return
}

func (rs *RedisStorage) SetActions(key string, as Actions) (err error) {
	result, err := rs.ms.Marshal(&as)
	err = rs.db.Set(ACTION_PREFIX+key, result)
	// cache2go.Cache(ACTION_PREFIX+key, as)
	return
}

func (rs *RedisStorage) GetSharedGroup(key string, checkDb bool) (sg *SharedGroup, err error) {
	key = SHARED_GROUP_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(*SharedGroup), nil
	}
	if !checkDb {
		return nil, errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		err = rs.ms.Unmarshal(values, &sg)
		cache2go.Cache(key, sg)
	}
	return
}

func (rs *RedisStorage) SetSharedGroup(sg *SharedGroup) (err error) {
	result, err := rs.ms.Marshal(sg)
	err = rs.db.Set(SHARED_GROUP_PREFIX+sg.Id, result)
	cache2go.Cache(SHARED_GROUP_PREFIX+sg.Id, sg)
	return
}

func (rs *RedisStorage) GetAccount(key string) (ub *Account, err error) {
	var values []byte
	if values, err = rs.db.Get(ACCOUNT_PREFIX + key); err == nil {
		ub = &Account{Id: key}
		err = rs.ms.Unmarshal(values, ub)
	}

	return
}

func (rs *RedisStorage) SetAccount(ub *Account) (err error) {
	// never override existing account with an empty one
	if len(ub.BalanceMap) == 0 {
		if ac, err := rs.GetAccount(ub.Id); err == nil {
			ac.ActionTriggers = ub.ActionTriggers
			ub = ac
		}
	}
	result, err := rs.ms.Marshal(ub)
	err = rs.db.Set(ACCOUNT_PREFIX+ub.Id, result)
	return
}

func (rs *RedisStorage) GetActionTimings(key string) (ats ActionPlan, err error) {
	var values []byte
	if values, err = rs.db.Get(ACTION_TIMING_PREFIX + key); err == nil {
		err = rs.ms.Unmarshal(values, &ats)
	}
	return
}

func (rs *RedisStorage) SetActionTimings(key string, ats ActionPlan) (err error) {
	if len(ats) == 0 {
		// delete the key
		_, err = rs.db.Del(ACTION_TIMING_PREFIX + key)
		return err
	}
	result, err := rs.ms.Marshal(&ats)
	err = rs.db.Set(ACTION_TIMING_PREFIX+key, result)
	return
}

func (rs *RedisStorage) GetAllActionTimings() (ats map[string]ActionPlan, err error) {
	keys, err := rs.db.Keys(ACTION_TIMING_PREFIX + "*")
	if err != nil {
		return nil, err
	}
	ats = make(map[string]ActionPlan, len(keys))
	for _, key := range keys {
		values, err := rs.db.Get(key)
		if err != nil {
			continue
		}
		var tempAts ActionPlan
		err = rs.ms.Unmarshal(values, &tempAts)
		ats[key[len(ACTION_TIMING_PREFIX):]] = tempAts
	}

	return
}

func (rs *RedisStorage) GetDerivedChargers(key string, checkDb bool) (dcs utils.DerivedChargers, err error) {
	key = DERIVEDCHARGERS_PREFIX + key
	if x, err := cache2go.GetCached(key); err == nil {
		return x.(utils.DerivedChargers), nil
	}
	if !checkDb {
		return nil, errors.New(utils.ERR_NOT_FOUND)
	}
	var values []byte
	if values, err = rs.db.Get(key); err == nil {
		err = rs.ms.Unmarshal(values, &dcs)
		cache2go.Cache(key, dcs)
	}
	return dcs, err
}

func (rs *RedisStorage) SetDerivedChargers(key string, dcs utils.DerivedChargers) (err error) {
	if len(dcs) == 0 {
		_, err = rs.db.Del(DERIVEDCHARGERS_PREFIX + key)
		return err
	}
	marshaled, err := rs.ms.Marshal(dcs)
	err = rs.db.Set(DERIVEDCHARGERS_PREFIX+key, marshaled)
	return err
}

func (rs *RedisStorage) LogCallCost(cgrid, source, runid string, cc *CallCost) (err error) {
	var result []byte
	result, err = rs.ms.Marshal(cc)
	if err != nil {
		return
	}
	err = rs.db.Set(LOG_CALL_COST_PREFIX+source+runid+"_"+cgrid, result)
	return
}

func (rs *RedisStorage) GetCallCostLog(cgrid, source, runid string) (cc *CallCost, err error) {
	var values []byte
	if values, err = rs.db.Get(LOG_CALL_COST_PREFIX + source + runid + "_" + cgrid); err == nil {
		err = rs.ms.Unmarshal(values, cc)
	}
	return
}

func (rs *RedisStorage) LogActionTrigger(ubId, source string, at *ActionTrigger, as Actions) (err error) {
	mat, err := rs.ms.Marshal(at)
	if err != nil {
		return
	}
	mas, err := rs.ms.Marshal(as)
	if err != nil {
		return
	}
	rs.db.Set(LOG_ACTION_TRIGGER_PREFIX+source+"_"+time.Now().Format(time.RFC3339Nano), []byte(fmt.Sprintf("%v*%v*%v", ubId, string(mat), string(mas))))
	return
}

func (rs *RedisStorage) LogActionTiming(source string, at *ActionTiming, as Actions) (err error) {
	mat, err := rs.ms.Marshal(at)
	if err != nil {
		return
	}
	mas, err := rs.ms.Marshal(as)
	if err != nil {
		return
	}
	err = rs.db.Set(LOG_ACTION_TIMMING_PREFIX+source+"_"+time.Now().Format(time.RFC3339Nano), []byte(fmt.Sprintf("%v*%v", string(mat), string(mas))))
	return
}

func (rs *RedisStorage) LogError(uuid, source, runid, errstr string) (err error) {
	err = rs.db.Set(LOG_ERR+source+runid+"_"+uuid, []byte(errstr))
	return
}