var counter = 0;

var globalStyle = document.createElement("style");
document.head.appendChild(globalStyle);

String.prototype.map = Array.prototype.map;

function toCssAttr(txt){
    return txt.map(d => (d.toUpperCase() === d && d !== d.toLowerCase()) ? "-" + d.toLowerCase(): d ).join("");
}

export class Stear{

    elem;
    #childs = {};

    constructor(elem){
        this.elem = elem;
        elem.style.position="relative";
    }

    style(css){
        Object.entries(css).forEach(([k, d]) => {
            this.elem.style[k] = d;
        });
    }

    addElement (id,elem){
        if(!(elem instanceof SFrame))throw new TypeError("Cannot add Element not extending from SFrame");
        this.#childs[id] = elem;
    }

    getElement (id) {
        return this.g(id);
    }
    
    g(id){
        return this.#childs[id];
    }

    async call (elem, args, layer = 1){
        return await elem.call(this, args, layer);
    }

    static addGlobalStyleText(text){
        globalStyle.innerHTML+="\n"+text;
    }

    static addAnimation(steps, name = "stearAnimation_" + counter++){
        Stear.addGlobalStyleText(`@keyframes ${name} {
${
Object.entries(steps).map(([k,d])=>
`   ${k} {
${Object.entries(d).map(d => "      " + toCssAttr(d[0]) + ": " + d[1] + ";").join("\n")}
    }`).join("\n")
}
}`);

        return name;
    }
    static addGlobalStyleJSON(json, name = ".stearClass_" + counter++){
        Stear.addGlobalStyleText(`
${name} {
${Object.entries(json).map(d => "    " + toCssAttr(d[0]) + ": " + d[1] + ";").join("\n")} 
}
        `)
        return name;
    }
}

export class SFrame{
    #preRender;
    #call;

    constructor({ call, preRender = true }){
        this.#preRender = preRender;
        this.#call = call;
    }

    async call(stear, args, layer = 1){
        let lastRender;
        let renderElem;
        
        let event = { onloaded: () => { }, onclose: ()=>{}, onresolve: () => { }, onBeforRerender: () => { }, onAfterRerender: () => { } };
        let find = {};

        let resolved = false;

        async function render(args){
            if(!renderElem) return;
            if(lastRender)if ([...(stear.elem.children)].includes(lastRender._)) stear.elem.removeChild(lastRender._);
            let now = renderElem;
            if(typeof now == "function")now = await now();
            if(!(now instanceof class_)) throw new Error("The Element to render is not an instance of class_");
            await now.build(args);

            stear.elem.appendChild(now.render);
            lastRender = now;

            now._.style.zIndex = layer;

            for (var member in find) delete find[member];
            Object.assign(find, now.find);
            return lastRender;
        }
        return new Promise(async (res,rej)=>{
            let firstRender = false;
            renderElem = await this.#call(stear,{
                find,
                render: async (...args) => {
                    await event.onBeforRerender(...args);
                    if(renderElem)await render(args);
                    firstRender = true;
                    await event.onAfterRerender(...args);
                    return find;
                },
                resolve: async (r,close=true)=>{
                    if (resolved) return;
                    resolved = true;
                    await event.onresolve();
                    if (close&&lastRender&&[...(stear.elem.children)].includes(lastRender._))stear.elem.removeChild(lastRender._);
                    res(r);
                },
                call: (elem, args= {})=>{
                    return stear.call(elem,args,layer+1);
                },
                close: async ()=>{
                    await event.onclose();
                    if (close && lastRender && [...(stear.elem.children)].includes(lastRender._)) stear.elem.removeChild(lastRender._);
                },
                event
            }, args);
            if(!renderElem) {
                
            }else{
                if (this.#preRender | firstRender) await render([]);
                event.onloaded();
            }           
            
        });
    }

}

export class SWindow extends SFrame{

    #Frame;

    constructor({ call, preRender = true, backgroundColor = "transparent"}){
        var Frame = _({
            style: {
                top: "0px",
                left: "0px",
                position: "absolute",
                height: "100%",
                width: "100%",
                display: "block",
                backgroundColor,
                //overflow:"scroll"
            },
            find:"main"
        }, []);
        super({
            call: async(...args) => _({
                style: {
                    top: "0px",
                    left: "0px",
                    position: "absolute",
                    height: "100%",
                    width: "100%",
                    display: "block",
                    backgroundColor,
                    //overflow:"scroll"
                },
                find: "main"
            }, await call(...args)), 
            preRender
        });
        this.#Frame = Frame;
    }
    
}

export class class_ {
    #elem;
    #childs;
    #build;
    #find;

    constructor(settings,childs){
        this.#elem = document.createElement(settings.type ?? "div");
        this.#childs = childs;
        var keys = Object.keys(settings);
        for (let i = 0; i < keys.length; i++) {
            const key = keys[i];
            if(key == "type"){} else if (key == "style"){
                Object.entries(settings[key]).forEach(([k,d])=>{
                    this.#elem.style[k] = d;
                });
            } else if (key == "find"){
                this.#find = settings[key];
            } else if (key == "event"){
                Object.entries(settings[key]).forEach(([k, d]) => {
                    this.#elem.addEventListener(k,d);
                });
            } else {
                this.#elem.setAttribute(key,settings[key]);
            }
        }
    }

    set childs(childs){
        this.#childs = Array.isArray(childs) ? childs : [childs];
    }

    set settings(settings){
        var keys = Object.keys(settings);
        for (let i = 0; i < keys.length; i++) {
            const key = keys[i];
            if (key == "type") { } else if (key == "style") {
                Object.entries(settings[key]).forEach(([k, d]) => {
                    this.#elem.style[k] = d;
                });
            } else if (key == "find") {
                this.#find = settings[key];
            } else {
                this.#elem.setAttribute(key, settings[key]);
            }
        }
    }

    async build (args) {
        this.#build = [];
        for (let i = 0; i < this.#childs.length; i++) {
            let elem = this.#childs[i];

            if (typeof elem == "function") elem = await elem(...args);

            if(Array.isArray(elem)){
                for (let j = 0; j < elem.length; j++) {
                    if (elem[j] instanceof class_) await elem[j].build(args);
                }
                this.#build.push(...elem);
            }else{
                if(elem instanceof class_)await elem.build(args);
                this.#build.push(elem);
            }
        }
    }

    get render (){
        this.#elem.innerHTML = "";
        for (let i = 0; i < this.#build.length; i++) {
            const elem = this.#build[i];
            if (typeof elem == "string") {
                this.#elem.appendChild(document.createTextNode(elem));
            } else {
                this.#elem.appendChild(elem.render);
            }            
        }
        return this.#elem;
    }

    get _ (){
        return this.#elem;
    }

    get find (){
        var out = {};
        this.#build.forEach(d=>{
            Object.assign(out,d.find);
        });
        if (this.#find) out[this.#find]=this;
        return out;
    }
}
export const _ = (settings = {}, childs = []) => new class_(settings, Array.isArray(childs) ? childs : [childs]);