export const 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;
        }
        // payload only accepts NON-Bas-Prefixed chans
        let subscribed = []
        for(var chan of payload){
            if((!chan) || (typeof(chan)!='string')) continue
            chan = chan.replace(/\[UID\]/g, this.userId)
            chan = chan.replace(/\[CUID\]/g, this.uuid)
            if(!this.accessRights.canSubscribe(this.userId, this.roles, chan, this.uuid)) {
                if(this.debug) console.log('SUB: No rights to this chan!', this.userId, this.roles, chan)
                continue
            }
            
            let coudSubscribe = false
            for(const rediscnx of this.allRediscnx){
                if(!chan.startsWith(rediscnx.redisConfig.chansNamespace)) continue
                else coudSubscribe = true
                let localChan = rediscnx.redisConfig.basePrefix  + chan
                if(!(localChan in rediscnx.subscriptions)) rediscnx.subscriptions[localChan] = [];
                if(!rediscnx.subscriptions[localChan].includes(this.uuid)) {
                    rediscnx.subscriptions[localChan].push(this.uuid);                    
                }
            }

            if(coudSubscribe && (!subscribed.includes(chan))) subscribed.push(chan)
            if(coudSubscribe && (!this.subscriptions.includes(chan)) ){ this.subscriptions.push(chan) }

        }

        let reply = {
            'action': action,
            'payload': subscribed,
            '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;
        };
        // payload only accepts NON-Bas-Prefixed chans
        let unSubscribed = []
        for(var chan of payload){
            if((!chan) || (typeof(chan)!='string')) continue
            chan = chan.replace(/\[UID\]/g, this.userId)  
            chan = chan.replace(/\[CUID\]/g, this.uuid)          
            if(this.accessRights.isMandatory(this.userId, this.roles, chan, this.uuid)) continue

            let couldUnsubscribe = false
            for(const rediscnx of this.allRediscnx){
                if(!chan.startsWith(rediscnx.redisConfig.chansNamespace)) continue
                else couldUnsubscribe = true
                let localChan = rediscnx.redisConfig.basePrefix  + chan
                if((localChan in rediscnx.subscriptions) && (rediscnx.subscriptions[chan].includes(this.uuid))) {
                    rediscnx.subscriptions[localChan].splice(rediscnx.subscriptions[localChan].indexOf(this.uuid), 1) ;
                }
            }

            if(couldUnsubscribe && (!unSubscribed.includes(chan))) unSubscribed.push(chan)
            if(couldUnsubscribe && this.subscriptions.includes(chan))  {
                this.subscriptions.splice(this.subscriptions.indexOf(chan), 1);
            }
        }

        let reply = {
            'action': action,
            'payload': unSubscribed,
            '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 reply = {
            'action': action,
            'payload': this.subscriptions,
            '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.uuid)) ) {
            this.sendErr(action, 'Unauthorized chan !', reqid);
            if(this.debug) console.log('PUB: Unauthorized chan', payload.chan, this.userId, this.roles)
            return
        }

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

        const chan =  payload.chan

        // First find the primary redis for this chan namespace, to do historization first, and get the histId
        const primaryRediscnx = this.allRediscnx.find(cnx => ((chan.startsWith(cnx.redisConfig.chansNamespace)) &&(cnx.redisConfig.role=='primary')) )
        if(!primaryRediscnx){
            this.sendErr(action, 'No primary redis for this chan !', reqid);
            if(this.debug) console.log('PUB: No primary redis for this chan ', chan)
            return
        }
        if(primaryRediscnx.isHistorizedChan(chan)){ 
            histId = await rediscnx.redisXadd(rediscnx.redisConfig.basePrefix+rediscnx.redisConfig.historizePrefix + chan, payload.msg, rediscnx.redisConfig.historizeMax);
            if( !histId) {
                this.sendErr(action, 'Could not historize, aborted event publish !', reqid);
                console.error(`Could not historize for "${chan}", aborted event publish !`)
                return
            }
            msgO.histId = histId                
        }

        // Now publish on every Redis that covers this chan namespace
        try { payload.msg = JSON.stringify(msgO) } catch(err) {payload.msg = `{"err":"${err}}"` }  
        for(const rediscnx of this.allRediscnx){
            if(!chan.startsWith(rediscnx.redisConfig.chansNamespace)) continue      
            rediscnx.redisPublish(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 
        } 

        payload.channel = payload.channel.replace(/\[UID\]/g, this.userId)
                                         .replace(/\[CUID\]/g, this.uuid)
        if( (!this.accessRights.canSubscribe(this.userId, this.roles, payload.channel, this.uuid)) ) {
            this.sendErr(action, 'CHANHIST: Unauthorized channel !', reqid)
            return             
        }

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

        if(!primaryRediscnx.isHistorizedChan(payload.channel)){
            this.sendErr(action, 'CHANHIST: 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(primaryRediscnx.redisConfig.basePrefix) ? primaryRediscnx.redisConfig.historizePrefix+payload.channel.substr(primaryRediscnx.redisConfig.basePrefix.length) : primaryRediscnx.redisConfig.historizePrefix + payload.channel
        let respPayload = await primaryRediscnx.redisXrange(streamName, from, to);

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

}