module.exports.methods = {
    /*  Request:
        {
            "action": "SUB",
            "payload" : ["chan1","chan2","unauthorized"]
        }
        Reply: (returns all active subscriptions after this SUB)
        {
            "action": "SUB",
            "success": true,
            "payload" : ["chan1","chan2","wasalreadysubscribed"]
        }
    */
    action_SUB(action, payload, reqid){
        if(!Array.isArray(payload)){
            this.sendErr(action, 'Invalid payload', reqid);
            return;
        };

        for(var chan of payload){
            if((!chan) || (typeof(chan)!='string')) continue
            if(!this.accessRights.canSubscribe(this.userId, this.roles, chan)) continue
            // Chat chans are forbidden here
            if((chan.substr(0,8) == 'userchans') || (chan.substr(0,9) == 'lobbychans')) continue;
            
            if(!chan.startsWith(this.config.redis.basePrefix)) chan = this.config.redis.basePrefix  + chan
            if(this.subscriptions.indexOf(chan)<0) {
                this.subscriptions.push(chan);                    
            }
            if(!(chan in this.rediscnx.subscriptions)) this.rediscnx.subscriptions[chan] = [];
            if(this.rediscnx.subscriptions[chan].indexOf(this.uuid)<0) {
                this.rediscnx.subscriptions[chan].push(this.uuid);                    
            }
        }

        let shortChans = this.subscriptions.map(item => (
         item.startsWith(this.config.redis.basePrefix) ? item.substr(this.config.redis.basePrefix.length) : item
        ))

        let reply = {
            'action': action,
            'payload': shortChans,
            'success': true,
        };
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));       
    },

    /*
        Request:
        {
            "action":"UNSUB",
            "payload" : ["chan1","notsubscribed_chan","mandatory_chan"]
        }
        reply:
        {
            "action":"UNSUB",
            "success": true,
            "payload" : ["chan1"]
        }
    */    
    action_UNSUB(action, payload, reqid){
        if(!Array.isArray(payload)){
            this.sendErr(action, 'Invalid payload', reqid);
            return;
        };

        for(var chan of payload){
            if((!chan) || (typeof(chan)!='string')) continue
            if(this.accessRights.isMandatory(this.userId, this.roles, chan)) continue

            // Chat chans are forbidden here
            if((chan.substr(0,8) == 'userchans') || (chan.substr(0,9) == 'lobbychans')) continue;

            if(!chan.startsWith(this.config.redis.basePrefix)) chan = this.config.redis.basePrefix  + chan
            if(this.subscriptions.indexOf(chan)>-1) {
                this.subscriptions.splice(this.subscriptions.indexOf(chan), 1);
            }
            if((chan in this.rediscnx.subscriptions) && (this.rediscnx.subscriptions[chan].indexOf(this.uuid)>-1)) {
                this.rediscnx.subscriptions[chan].splice(this.rediscnx.subscriptions[chan].indexOf(this.uuid), 1) ;
            }
        }

        let shortChans = this.subscriptions.map(item => (
            item.startsWith(this.config.redis.basePrefix) ? item.substr(this.config.redis.basePrefix.length) : item
        ))
        let reply = {
            'action': action,
            'payload': shortChans,
            'success': true,
        };      
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));
    },

    /*        
        Request:
        {
            "action": "SUBLST",
        }
        reply:
        {
            "action": "SUBLST",
            "success": true,
            "payload" : ["chan1","chan2","mandatory_chan"]
        }
    */    
    action_SUBLST(action, payload, reqid){
        let shortChans = this.subscriptions.map(item => (
            item.startsWith(this.config.redis.basePrefix) ? item.substr(this.config.redis.basePrefix.length) : item
           ))
        let reply = {
            'action': action,
            'payload': shortChans,
            'success': true,
        };   
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));           
    },

    /*        
        Request:
        {
            "action": "PUB",
            "payload" : { 'chan':'chan1', 'msg':'Hello folks !'}
        }
        reply:
        {
            "action": "PUB",
            "success": true,
        }
    */    
    async action_PUB(action, payload, reqid){
        if((typeof(payload)!='object') || (typeof(payload.chan)!='string') || (typeof(payload.msg)!='string')){
            this.sendErr(action, 'Invalid payload', reqid);
            if(this.debug) console.log('PUB: Invalid payload')
            return;
        };
        // Chat chans are forbidden here
        if((payload.chan.substr(0,8) == 'userchans') || (payload.chan.substr(0,9) == 'lobbychans')){
            this.sendErr(action, 'Forbidden chan', reqid);
            if(this.debug) console.log('PUB: Forbidden chan')
            return;
        };
        
        if( (!this.accessRights.canPublish(this.userId, this.roles, payload.chan)) &&
            (! this.rediscnx.redPillsUuids.includes(this.uuid)) ) {
            this.sendErr(action, 'Unauthorized chan !', reqid);
            if(this.debug) console.log('PUB: Unauthorized chan', payload.chan)
            return
        }

        let msgO
        try { msgO = JSON.parse(payload.msg) } catch(err) { msgO = {'err':err} }

        let histId = null
        if(this.rediscnx.isHistorizedChan(payload.chan)) { // historize first to add the histId
            let shortChan = payload.chan.startsWith(this.config.redis.basePrefix) ? payload.chan.substr(this.config.redis.basePrefix.length) : payload.chan
            histId = await this.rediscnx.redisXadd(this.config.redis.basePrefix+this.config.redis.historizePrefix + shortChan, payload.msg, this.config.redis.historizeMax);
            if( !histId) {
                this.sendErr(action, 'Could not historize, aborted event publish !', reqid);
                console.error(`Could not historize for "${shortChan}", aborted event publish !`)
                return
            }
            msgO.histId = histId                
        }

        msgO.sender = this.userId
        try { payload.msg = JSON.stringify(msgO) } catch(err) {payload.msg = `{"err":"${err}}"` }        
        this.rediscnx.redisPublish(payload.chan, payload.msg)
        
        let reply = {
            'action': action,
            'payload': null,
            'success': true,
        };      
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));
    },
    
    /*        
        Request:
        {
            "action": "CHANHIST",
            "payload": { 
                "chan": "aze",
                "from": "123456879-0", //Histid or seconds since epoch
                "to": "987654321-1" // Optional
            }
        }
        reply:
        {
            "action": "CHANHIST",
            "success": true,
            "payload" : [
                "123456879-1": {  payload },
                "123456885-0": {  payload },
                "123456890-0": {  payload }
            ]
        }
    */    
    async action_CHANHIST(action, payload, reqid){
        if((!payload.channel) || (typeof(payload.channel)!='string') || (!payload.from) || (typeof(payload.from)!='string') || (payload.to && (typeof(payload.to)!='string'))){
            this.sendErr(action, 'Invalid payload', reqid)
            return 
        }
        if( (!payload.from.match(/^(\d{13,})-(\d+)$/)) && (!payload.from.match(/^(\d{10,})$/)) ){
            this.sendErr(action, 'Invalid payload', reqid)
            return 
        }
        if(payload.to && (!payload.to.match(/^(\d{13,})-(\d+)$/)) && (!payload.to.match(/^(\d{10,})$/)) ){
            this.sendErr(action, 'Invalid payload', reqid)
            return 
        } 

        if( (!this.accessRights.canSubscribe(this.userId, this.roles, payload.channel)) &&
            (! this.rediscnx.redPillsUuids.includes(this.uuid)) ) {
            this.sendErr(action, 'Unauthorized channel !', reqid)
            return             
        }

        if(!this.rediscnx.isHistorizedChan(payload.channel)){
            this.sendErr(action, 'Not an historized channel !', reqid)
            return             
        }

        let from = (payload.from.indexOf('-')>-1) ? payload.from : 1000*payload.from
        let to = '+'
        if(payload.to) to = (payload.to.indexOf('-')>-1) ? payload.to : 1000*payload.to
        let streamName = payload.channel.startsWith(this.config.redis.basePrefix) ? this.config.redis.historizePrefix+payload.channel.substr(this.config.redis.basePrefix.length) : this.config.redis.historizePrefix + payload.channel
        let respPayload = await this.rediscnx.redisXrange(streamName, from, to);

        let reply = {
            'action': action,
            'payload': respPayload,
            'success': true,
        };   
        if(reqid) reply.reqid = reqid;                 
        this.send(JSON.stringify(reply));  
    },

}