import uuid from 'node-uuid';


export default class _wordset {
    constructor() {
        this.sets = {};
        let wordsets = localStorage.getItem("wordsets");
        if (wordsets) {
            this.sets = JSON.parse(wordsets);
        }
    }
    save() {
        localStorage.setItem("wordsets", JSON.stringify(this.sets));
    }
    get _inner() {
        return this.sets;
    }
    get _firstClass(){
        return Object.keys(this.sets)[0] || null;
    }
    get _allclass(){
        return Object.keys(this.sets);
    }
    get _allsets(){
        return Object.values(this.sets);
    }
    getClass(class_name) {
        if (this.sets[class_name]) {
            return this.sets[class_name];
        }
        else return null;
    }
    getSetStatus(class_name,id){
        let set_class = this.getClass(class_name);
        if(set_class){
            for(let i of set_class){
                if(i.id === id){
                    return i;
                }
            }
        }
        return null;
    }
    getId(class_name,id){
        let set_class = this.sets[class_name];
        for(let index in set_class){
            if(set_class[index].id === id){
                return index;
            }
        }
    }
    getSet(id) {
        let sets = JSON.parse(localStorage.getItem(id));
        if (sets) {
            return sets;
        }
        else return [];
    }
    delSet(class_name, index) {
        let set_class = this.sets[class_name];
        if (set_class) {
            if (set_class[index]) {
                localStorage.removeItem(set_class[index].id);
                this.sets[class_name].splice(index, 1);
                if (!this.sets[class_name].length) {
                    delete this.sets[class_name];
                }
                localStorage.setItem("wordsets", JSON.stringify(this.sets));
                return true;
            }
        }
        return false;
    }
    addSet(class_name,name) {
        if (!this.sets[class_name]) {
            this.sets[class_name] = [];
        }
        let id = uuid.v1();
        let time = (new Date()).getTime()
        this.sets[class_name].push({
            name: name,
            id: id,
            created: time,
        });
        localStorage.setItem(id, JSON.stringify([]));
        this.save();
        return id;
    }
    saveSet(id,data){
        localStorage.setItem(id, JSON.stringify(data));
    }
    renameSet(class_name,id,new_name){
        let set_class = this.getClass(class_name);
        if(set_class){
            for(let i of set_class){
                if(i.id === id){
                    i.name = new_name;
                    this.save();
                    return;
                }
            }
        }
    }
    addSetTo(origin_id,dest_id){
        let origin_set = this.getSet(origin_id);
        let dest_set = this.getSet(dest_id);
        let set={};
        origin_set.forEach(element => {
            set[element.word] = element;
        });
        dest_set.forEach(element => {
            set[element.word] = element;
        });
        set = Object.values(set);
        this.saveSet(dest_id,set);
        return origin_set.length + dest_set.length - set.length;
    }
    fromArray(arr,class_name,name){
        let id = this.addSet(class_name,name);
        this.saveSet(id,arr);
    }
    async import_set(callback){
        let [fileHandle] = await window.showOpenFilePicker({
            types: [
                {
                    description: "JSON file",
                    accept: {
                        'text/json': ['.json'],
                    },
                },
            ],
        });
        let file = await fileHandle.getFile();
        let data = JSON.parse(await file.text());
        let cnt = 0;
        for (let i of Object.keys(data.wordsets)) {
            for (let j of data.wordsets[i]) {
                if (!localStorage.getItem(j.id)) {
                    if (!this.sets[i]) this.sets[i] = [];
                    this.sets[i].push(j);
                    localStorage.setItem(j.id, data.words[j.id]);
                    cnt++;
                }
            }
        }
        this.save();
        if(typeof callback === "function"){
            callback(cnt);
        }
    }
    async export_set(callback) {
        let fileHandle = await window.showSaveFilePicker({
            types: [
                {
                    description: "JSON file",
                    accept: {
                        'text/json': ['.json'],
                    },
                },
            ],
        });
        let writestream = await fileHandle.createWritable();
        let data = {
            wordsets: this.sets,
            words: {}
        };
        let cnt = 0;
        for (let i of Object.values(this.sets)) {
            for (let j of i) {
                let temp = localStorage.getItem(j.id);
                data.words[j.id] = temp;
                cnt++;
            }
        }
        writestream.write(JSON.stringify(data));
        writestream.close();
        if(typeof callback === "function"){
            callback(cnt);
        }
    }
}