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
    let c = item.category
    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' || c=='historic' || t=='place_of_worship'){
        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' || t=='garden' || 0){
        return 'tree';
    }else if(t=='water_park', t=='theme_park'){
        return 'dice-five';
    }else if(t=='?' || t=='neighbourhood' || t=='quarter' || c=='highway'){
        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_edit: (['view','short'].indexOf(window.location.pathname.split('/')[1])==-1),
        journey_id : window.location.pathname.split('/').pop() || gen_id(16),
        
        journey_step_data: {day:1, section:0},
        journey_data : {
            name: "New Journey",
            main:[],
        },
        
        query:{hotel:[],flight:[],nominatim:[]},
        querying:{hotel:false,flight:false,place:false,food:false},
        impexp:"",
        lang: {
            format: 'ddd D MMM',
            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({title:"?",step_title:[],map:{zoom:2}, hotel:{latlon:[0,0]},places:{restaurants:[],places:[]}});
        },
        step_len: function(idx){
            return this.journey_data.main[idx].dateRange?
                ((this.journey_data.main[idx].dateRange[1]-this.journey_data.main[idx].dateRange[0])/(1000*60*60*24))+1
                : 1;
        },
        next_step: function(){
            this.journey_step_data.day += 1;
            let s = this.journey_step_data.section;
            let cd = this.journey_data.main[s].dateRange?
                this.step_len(s):0;
                    
            if(this.journey_step_data.day>cd){
                this.journey_step_data.section +=1;
                if(this.journey_step_data.section>=this.journey_data.main.length){
                    this.journey_step_data.section = this.journey_data.main.length-1;
                }
                this.journey_step_data.day = 1;
            }

        },
        prev_step: function(){
            this.journey_step_data.day -=1;
            if(this.journey_step_data.day<=0){
                this.journey_step_data.section -=1;
                if(this.journey_step_data.section <0){
                    this.first_step();
                }else{
                    let s = this.journey_step_data.section;
                    
                    let cd = this.journey_data.main[s].dateRange? 
                        this.step_len(s):0;
                    this.journey_step_data.day = cd ;
                }
            }
        },
        nextnext_step: function(){
            this.journey_step_data.section += 1;
            this.journey_step_data.day = 1;
            if(this.journey_step_data.section>=this.journey_data.main.length)
                this.first_step();
        },
        prevprev_step: function(){
            this.journey_step_data.section -= 1;
            this.journey_step_data.day = 1;
            if(this.journey_step_data.section<0)
                this.first_step();
        },
        first_step: function(){
            this.journey_step_data.section =0;
            this.journey_step_data.day = 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){
            return ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][d.getDay()] + ' ' 
                + d.getDate() + ' '
                + ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];
        },
        update_date: function(idx){
            let dateRange = this.journey_data.main[idx].dateRange;
            let start_end = [0,0];
            let step_len = 0;

            let last_start = dateRange[0];
            for(let i = idx-1; i >=0; --i){
                step_len = this.step_len(i)-1;
                if (this.journey_data.main[i].dateRange){
                    start_end = [last_start.getDate() - step_len, last_start.getDate()];
                }else{
                    this.journey_data.main[i].dateRange= [new Date(), new Date()] 
                    start_end = [last_start.getDate() - step_len, last_start.getDate()];
                }
                this.journey_data.main[i].dateRange[0].setTime(last_start.getTime())
                this.journey_data.main[i].dateRange[0].setDate(start_end[0]);
                this.journey_data.main[i].dateRange[1].setTime(last_start.getTime())
                this.journey_data.main[i].dateRange[1].setDate(start_end[1]);
                last_start = this.journey_data.main[i].dateRange[0];
            }

            let last_end = dateRange[1];
            for(let i = idx+1; i<this.journey_data.main.length; ++i){
                step_len = this.step_len(i)-1;
                if (this.journey_data.main[i].dateRange){
                    start_end = [last_end.getDate(), last_end.getDate() + step_len];
                }else{
                    this.journey_data.main[i].dateRange= [new Date(), new Date()] 
                    start_end = [last_end.getDate(), last_end.getDate() + step_len];
                }
                this.journey_data.main[i].dateRange[0].setTime(last_end.getTime())
                this.journey_data.main[i].dateRange[0].setDate(start_end[0]);
                this.journey_data.main[i].dateRange[1].setTime(last_end.getTime())
                this.journey_data.main[i].dateRange[1].setDate(start_end[1]);
                last_end = this.journey_data.main[i].dateRange[1];
            }
        },

        rm_section: function(idx){
            this.journey_data.main.splice(idx,1);
            if(this.journey_step_data.section==idx){
                this.prevprev_step();
            }
        },
        sel_section: function(idx){
            this.journey_step_data.section = idx;
            this.journey_step_data.day = 1;
        },
        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));
            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)));
            this.journey_data.main.forEach(e=>{
                e.dateRange[0] = new Date(e.dateRange[0]);
                e.dateRange[1] = new Date(e.dateRange[1]);
            })
        },
        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_data.day):(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 =>{
            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]);
                }
                e.flight = undefined;
                e.step_title = e.step_title || [];
            }
        });
        
        
        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();
            },
            deep: true,
        },
    },
})