export const methods = {

    /*  Request:
        {
            "action": "SET"
            "payload": {
                "key": "keyname",
                "value": "stringifiedvalue", // If null : deletes the key
                "expire": 60 // if present & non zero, expires the key in x seconds.
                             // if absent or zero, we force a TTL of 2 years = 63072000 sec.
                "observe": true // if true: make it an observable key & subscribe to it
            }
            "reqid": "6az5e4r6a"
        }
        Reply:
        {
            "action":"SET",
            "success":true,
            "reqid": reqid
        }
    */
    async action_SET(action, payload, reqid){
        //TODO : observable...
        if((typeof(payload)!='object') || (typeof(payload.key)!='string') ||
           ((typeof(payload.value)!='object') && (payload.value!==null)) || 
           (payload.expire && (typeof(payload.expire)!='number')) ||
           (payload.observe && (typeof(payload.observe)!='boolean'))
           ){
            this.sendErr(action, 'Invalid payload', reqid)
            return
        }

        if(!this.accessRights.canSet(this.userId, this.roles, payload.key)){
            this.sendErr(action, 'Unauthorized key !', reqid);
            return
        }

        const primaryRediscnx = this.allRediscnx.find(cnx => ((payload.key.startsWith(cnx.redisConfig.chansNamespace)) &&(cnx.redisConfig.role=='primary')) )
        if(!primaryRediscnx){
            this.sendErr(action, 'No primary redis for this key prefix !', reqid);
            if(this.debug) console.log('ACTION_SET: No primary redis for this key ', payload.key)
            return
        }

        if(payload.value) {
            let val = null
            try { val = JSON.stringify(payload.value)}
            catch(err) { 
                this.sendErr(action, 'Cannot stringify value object !', reqid);
                return
             }
            if(val.length > primaryRediscnx.redisConfig.storeMaxSize){
                this.sendErr(action, 'value too large !', reqid);
                return
            }
            let exp = ((payload.expire>0) &&  (payload.expire<63072000)) ? payload.expire : 63072000        
            await primaryRediscnx.redisSet(payload.key, val, exp, primaryRediscnx.redisConfig.storePrefix)
        } else {
            await primaryRediscnx.redisDel(payload.key, primaryRediscnx.redisConfig.storePrefix)
        }
        var reply = {
            'action': action,
            'success': true,
        };
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));
    },

    /*  Request:
        {
            "action": "GET"
            "payload": {
                "key": "keyname"
            }
            "reqid": "6az5e4r6a"
        }
        Reply:
        {
            "action":"GET",
            "success":true,
            "payload": {
                "key" : key,
                "value": value
            }
            "reqid": reqid
        }
    */
    async action_GET(action, payload, reqid){
        //TODO : observable...
        if((typeof(payload)!='object') || (typeof(payload.key)!='string')){
            this.sendErr(action, 'Invalid payload', reqid);
            return;
        };

        if(!this.accessRights.canGet(this.userId, this.roles, payload.key)) {
            console.log('Unauth GET key:',this.userId, this.roles, payload.key)
            this.sendErr(action, 'Unauthorized key !', reqid);
            return
        }

        const primaryRediscnx = this.allRediscnx.find(cnx => ((payload.key.startsWith(cnx.redisConfig.chansNamespace)) &&(cnx.redisConfig.role=='primary')) )
        if(!primaryRediscnx){
            this.sendErr(action, 'No primary redis for this key prefix !', reqid);
            if(this.debug) console.log('ACTION_GET: No primary redis for this key ', payload.key)
            return
        }

        let rawVal = await primaryRediscnx.redisGet(payload.key, primaryRediscnx.redisConfig.storePrefix)
        let val = null
        try { val = JSON.parse(rawVal)}
        catch(err) { console.error('Action GET: Not a json !? ', rawVal) }    
        var reply = {
            'action': action,
            'payload': {
                    'key': payload.key,
                    'value': val
                },
            'success': true,
        };
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));
    }
    

}