const gen_id = (length)=>{
    var result           = '';
    const characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    const len = characters.length;
    for (let i = 0; i < length; i++ ) {
      result += characters.charAt(Math.floor(Math.random() * len));
   }
   return result;
}

Date.prototype.toJSONLocal = (function() {
    function addZ(n) {
        return (n<10? '0' : '') + n;
    }
    return function() {
      return this.getFullYear() + '-' +
             addZ(this.getMonth() + 1) + '-' +
             addZ(this.getDate());
    };
}())

function toEncoded(string) {
    const codeUnits = Uint16Array.from(
      { length: string.length },
      (element, index) => string.charCodeAt(index)
    );
    const charCodes = new Uint8Array(codeUnits.buffer);
  
    let result = "";
    charCodes.forEach((char) => {
      result += String.fromCharCode(char);
    });
    return window.btoa(result);
  }
  
  function toDecoded(string) {
    let binary = window.atob(string)
    const bytes = Uint8Array.from({ length: binary.length }, (element, index) =>
      binary.charCodeAt(index)
    );
    const charCodes = new Uint16Array(bytes.buffer);
  
    let result = "";
    charCodes.forEach((char) => {
      result += String.fromCharCode(char);
    });
    return result;
  }


const query_nominatim = (q,f) => axios.get('/api/place/'+q).then(res=>res.data).then(res=>res.filter(f))
const query_flight = (q) => axios.get('/api/flight/'+q).then(res=>res.data)

const is_restauration_type = e => ["restaurant", "cafe", "pub", "bar", "fast_food", "food_court"].indexOf(e.type)!=-1;

const is_attraction_type = e => (["tourism", "leisure", "place", "amenity", "highway", "historic", "natural", "waterway"].indexOf(e.category)!=-1 ||
    ["place_of_worship", "national_park", "nature_reserve", "protected_area"].indexOf(e.type!=-1));

const icon_type = (item)=>{
    let t = item.type
    const arr = ["restaurant", "cafe", "pub", "bar", "fast_food", "food_court"];
    if(arr.indexOf(t)!=-1){
        return 'utensils';
    }else if(t=='hotel' || t=='hostel'){
        return 'bed';
    }else if(t=='museum'){
        return 'landmark';
    }else if(t=='peak' || t=='viewpoint'){
        return 'mountain';
    }else if(t=='parking'){
        return 'parking';
    }else if(t=='water' || t=='river' || t=='lake' || t=='torrent' || t=='aquarium'){
        return 'water';
    }else if(t=='community_centre' || t=='locality'){
        return 'building';
    }else if(t=='attraction'){
        return 'landmark';
    }else if(t=='information' || t=='university'){
        return 'landmark';
    }else if(t=='bridge'){
        return 'archway';
    }else if(t=='woodland'|| t=='shieling' || t=='national_park' || t=='zoo' || t=='park'){
        return 'tree';
    }else if(t=='water_park', t=='theme_park'){
        return 'dice-five';
    }else if(t=='?'){
        return '';
    }else{
        console.log(item.display_name, item.category, item.type);
        return 'question';
    }
}

Vue.component('l-map', window.Vue2Leaflet.LMap)
Vue.component('l-tile-layer', window.Vue2Leaflet.LTileLayer)
Vue.component('l-marker', window.Vue2Leaflet.LMarker)
Vue.component('l-icon', window.Vue2Leaflet.LIcon)
Vue.component('l-popup', window.Vue2Leaflet.LPopup)
Vue.component('l-tooltip', window.Vue2Leaflet.LTooltip)
Vue.component('l-control-scale', window.Vue2Leaflet.LControlScale)
Vue.component('multiselect', window.VueMultiselect.default)
Vue.use(window.VueTextareaAutosize);

const app = new Vue({
    el: '#app',
    data: {
        journey_id : window.location.pathname.split('/').pop() || gen_id(16),
        journey_step: window.location.hash.slice(1)==""?((['view','short'].indexOf(window.location.pathname.split('/')[1])!=-1)?0:-1):parseInt(window.location.hash.slice(1)),
        journey_step_data: {day:-1, section:-1},
        journey_data : {
            name: "New Journey",
            main:[],
            step_title:[],
        },
        vtp: ['view','short'].indexOf(window.location.pathname.split('/')[1]),
        query:{hotel:[],flight:[],nominatim:[]},
        querying:{hotel:false,flight:false,place:false,food:false},
        impexp:"",
        lang: {
            formatLocale: {
                firstDayOfWeek: 1,
            },
            monthBeforeYear: true,
        },
    },
    methods: {
        start_journey: function(event){
            window.location.href = '/'+this.journey_id;
        },
        add_section: function(event){
            if(this.journey_data.main==undefined) this.journey_data.main=[];
            this.journey_data.main.push({step_title:"?",map:{zoom:2}, hotel:{latlon:[0,0]},places:{restaurants:[],places:[]}});
        },
        next_step: function(){
            this.journey_step+=1;
            this.journey_step_data = this.step_convert(this.journey_step);
            if(this.journey_step_data.section==-1) this.prev_step();
            window.location.hash = '#' + this.journey_step;

        },
        prev_step: function(){
            this.journey_step-=1;
            if(this.journey_step<-1) this.journey_step=-1;
            if(this.journey_step==-1 && this.view) this.journey_step=0;
            this.journey_step_data = this.step_convert(this.journey_step);
            window.location.hash = '#' + this.journey_step;

        },
        nextnext_step: function(){
            let nd = this.journey_step_data;
            let ns = this.journey_step;
            while((nd.section==this.journey_step_data.section || nd.day>1)
                     && ns>=0){
                ns+=1;
                nd = this.step_convert(ns)
                if(nd.section==-1){
                    ns-=1;
                    nd = this.step_convert(ns)
                    break;
                }
            }
            this.journey_step = ns;
            this.journey_step_data = nd;
            window.location.hash = '#' + this.journey_step;
        },
        prevprev_step: function(){
            let nd = this.journey_step_data;
            let ns = this.journey_step;
            while((nd.section==this.journey_step_data.section || nd.day>1)
                     && ns>=0){
                ns-=1;
                nd = this.step_convert(ns)
                if(ns==-1){
                    ns+=1;
                    nd = this.step_convert(ns)
                    break;
                }
            }
            this.journey_step = ns;
            this.journey_step_data = nd;
            window.location.hash = '#' + this.journey_step;
        },
        first_step: function(){
            this.journey_step=-1;
            this.journey_step_data = {day:-1, section:-1};
            window.location.hash = '';
        },
        step_convert: function(step){
            let steps_left = step+1;
            for(let e in this.journey_data.main){
                if(this.journey_data.main[e].dateRange && (this.journey_data.main[e].dateRange[0]-(new Date(0))) != 0){
                    let cd = ((this.journey_data.main[e].dateRange[1]-this.journey_data.main[e].dateRange[0])/(1000*60*60*24))+1;
                    if(cd>=steps_left){
                        return {day: steps_left, section:e,start: (steps_left==1), end: (steps_left==cd)};
                    }else{
                        steps_left -= cd;
                    }
                }else{
                    steps_left -= 1;
                }
                if(steps_left==0){
                        return {day:0,section:e, start:true,end:true};
                }
            }
            return {day:-1, section:-1};
        },
        active_date: function(){
            if(this.journey_step_data.day < 0) return "?";
            if(!this.journey_data.main[this.journey_step_data.section].dateRange) return "?";
            var date = new Date(this.journey_data.main[this.journey_step_data.section].dateRange[0]);
            date.setDate(date.getDate() + this.journey_step_data.day-1);
            return this.format_date(date)
        },
        format_date: function(d){
            var dt = d.toJSONLocal().slice(0, 10);
            return        dt.slice(8, 10) + '/' 
                        + dt.slice(5, 7) + '/' 
                        + dt.slice(0, 4) + ' ('
                        + ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][d.getDay()]
                        +')';
        },

        rm_section: function(idx){
            this.journey_data.main.splice(idx,1);
        },
        toggle_section_vis: function(idx){
            this.journey_data.main[idx].hidden = !this.journey_data.main[idx].hidden;
        },
        get_section_vis: function(idx){
            return !this.journey_data.main[idx].hidden
        },
        search_nominatim: function(txt,f){
            if(txt==""){
                this.query.nominatim=[];
                return Promise.resolve([]);
            }
            return query_nominatim(txt,f)
            .then((results) =>{
                results.forEach(r=>{
                    r.latlon=[parseFloat(r.lat),parseFloat(r.lon)];
                    r.sname=r.display_name.split(',')[0];
                })
                this.query.nominatim=results;
            });
        },
        search_flight: function(txt){
            if(txt=="") return;
            this.querying.flight=true;
            query_flight(txt.replace(" ", ""))
            .then((results) =>{
                if(results.results==""){
                    this.query.flight=[];this.querying.flight=false;return;
                }
                this.query.flight=results.results;
                this.querying.flight=false;
            });
    
        },
        generate_icon: function(item,fcolor){
            return L.AwesomeMarkers.icon({
                icon: icon_type(item) || 'star', prefix: 'fa',
                markerColor: fcolor || item.color || 'blue'}
            ).createIcon().outerHTML
        },

        save_data: function(){
            this.impexp = toEncoded(JSON.stringify(this.journey_data));
            console.log(this.journey_data)
            axios.post('/api/'+this.journey_id, this.journey_data).then(response => {
              console.log("Saved...")
            }).catch(error => {
              console.warn('Error! Could not reach the API.')
            })
        },
        import_data:function(){
            this.journey_data = Object.assign({}, JSON.parse(toDecoded(this.impexp)));
        },
        export_data:function(){
            this.impexp = toEncoded(JSON.stringify(this.journey_data));
        },
        filter_selected:function(list,step){
            return list.filter(e=>(step?(e.step==this.journey_step):(e.step>=0)))
        },
        filter_unselected:function(list){
            return list.filter(e=>(e.step==undefined || e.step<0))
        },
        remove_item:function(list,idx){
            list[idx].step=-1;
            list.splice(idx, 1);
        },
        log:function(e){console.log(e)},
    },
    created: function () {
        axios.get('/api/'+this.journey_id).then(response =>{
            console.log(response)
            if(response.data=='') throw "Invalid Journey Data Received";
            app.journey_data = response.data;
            
            for(let e of app.journey_data.main){
                if(e.dateRange && e.dateRange.length===2){
                    e.dateRange[0]= new Date(e.dateRange[0]);
                    e.dateRange[1]= new Date(e.dateRange[1]);
                }
            }
            this.journey_step_data = this.step_convert(this.journey_step);
        });
        this.debounceSave = _.debounce(this.save_data, 500)
        this.debounceSearch = {"hotel":_.debounce((q)=>{this.querying.hotel=true;this.search_nominatim(q,(r)=>(r.type=="hotel" || r.type=="hostel")).then((r)=>{this.querying.hotel=false});}, 500),
                               "restaurants":_.debounce((q)=>{this.querying.food=true;this.search_nominatim(q,(r)=>(is_restauration_type(r))).then((r)=>{this.querying.food=false});}, 500),
                               "places":_.debounce((q)=>{this.querying.place=true;this.search_nominatim(q,(r)=>(is_attraction_type(r))).then((r)=>{this.querying.place=false});}, 500),
                               "other":_.debounce((q)=>{this.querying.any=true;this.search_nominatim(q,(r)=>(true)).then((r)=>{this.querying.any=false});}, 500),
                               "flight":_.debounce((q)=>this.search_flight(q), 500)
                           }
    },
    watch: {
        journey_data: {
            handler:function (ndata, odata){ 
                this.debounceSave()
                if(ndata.main.length == odata.main.length){
                    for(let d in ndata.main){
                        if(ndata.main[d].hotel != odata.main[d].hotel){
                            if(ndata.main[d].hotel.latlon){
                                this.journey_data.main[d].map.center=ndata.main[d].hotel.latlon;
                            }
                        }
                    }
                }
            },
            deep: true,
        },
    },
})