import { LanguagePool, LanguagePoolString } from "./language.js"
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("");
};

class callPromise extends Promise{
    #opts = {};
    constructor(cb){
        super(cb);
    };
    set opts(opts){
        this.#opts = opts;
    }
    get opts(){
        return this.#opts;
    }
}

const pools = {

};

/** Stear class */
export class Stear{

    elem;
    #childs = {};
    #frames = [];

    /**
     * Creating a Stear class. It can be used to render "stear" in an Element.
     * 
     * @param {HTMLElement} elem 
     */
    constructor(elem){
        this.elem = elem;
        elem.style.position="relative";
    }

    /**
     * Change the Style of the render Element.
     * 
     * @param {JSON} css 
     */
    style(css){
        Object.entries(css).forEach(([k, d]) => {
            this.elem.style[k] = d;
        });
    }

    /**
     * An Store for Frames
     * 
     * @param {string} id 
     * @param {SFrame} elem 
     */
    addElement (id,elem){
        if(!(elem instanceof SFrame))throw new TypeError("Cannot add Element not extending from SFrame");
        this.#childs[id] = elem;
    }

    /**
     * Access an Element from the Frame Store
     * 
     * @param {string} id 
     * @returns 
     */
    getElement (id) {
        return this.g(id);
    }
    
    g(id){
        return this.#childs[id];
    }

    /**
     * Render an Element gloabal.
     * 
     * @param {SFrame} elem 
     * @param {*} args 
     * @param {number} layer 
     * @returns 
     */
    async call (elem, args, layer = 1){
        return await elem.call(this, args, this.#frames, layer);
    }

    /**
     * Render an Element in annother Element.
     * 
     * @param {SFrame} elem 
     * @param {*} args 
     * @param {HTMLElement} renderParent 
     * @param {number} layer 
     * @returns 
     */
    include(elem, args, renderParent, layer = 1){
        return elem.call(this, args, this.#frames, layer, renderParent);
    }

    /**
     * Rernder everthing.
     * 
     * @param {*} arg 
     * @returns 
     */
    rerenderGlobal(arg){
        if(this.#frames.length == 0)return;
        return new Promise((res,rej)=>{
            let running = this.#frames.length;
            for (let i = 0; i < this.#frames.length; i++) {
                const element = this.#frames[i];
                element.globalRenderRequest(arg)
                .then(()=>{
                    running--;
                    if(running==0)res();
                });
            }
        });
        
    }

    /**
     * Add raw css Data.
     * 
     * @param {string} text 
     */
    static addGlobalStyleText(text){
        globalStyle.innerHTML+="\n"+text;
    }

    /**
     * Add a css Animation
     * 
     * @param {object} steps - css like json Syntax
     * @param {string} name 
     * @returns {string} name
     */
    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;
    }

    /**
     * 
     * @param {object} json - css like json Syntax
     * @param {string} name - e.g. .classname
     * @returns {string} name
     */
    static addGlobalStyleJSON(json, name = ".stearClass_" + counter++){
        Stear.addGlobalStyleText(`
${name} {
${Object.entries(json).map(d => "    " + toCssAttr(d[0]) + ": " + d[1] + ";").join("\n")} 
}
        `)
        return name;
    }

    /**
     * Add A Language Pool. E.g. for a subpage.
     * 
     * @param {string} name 
     * @returns {LanguagePool}
     */
    static addLanguagePool(name){
        if(typeof pools[name] == "undefined"){
            pools[name] = new LanguagePool();
        }
        return pools[name];
    }

    /**
     * Add a file containing translations.
     * 
     * @param {JSON} data 
     * @param {string} lang 
     */
    static addLanguageFile(data,lang){
        Object.entries(data).forEach(([k,d]) => {
            if (typeof pools[k] == "undefined") pools[k] = new LanguagePool();
            pools[k].addFile(d,lang);
        });
    }  

    /**
     * Used Language
     */
    static set lang (lang){
        Object.entries(pools).forEach(([k, d]) => {
            d.lang = lang;
        });
        this.globalRenderRequest();
    }

    /**
     * Generate Language File with defaults
     */
    static get getLanguageFile(){
        var out = {};
        Object.entries(pools).forEach(([k, d]) => {
            out[k] = d.getFile;
        });
        return out;
    }
}

////////////////////////////////////////////////////////////////////////
//utils
/**
 * Can be called to close a frame and return a response.
 * @async
 * @callback utilsResolveCallback
 * @param {*} returnValue
 * @param {boolean} close
 */

/**
 * Remove this Frame from Screen
 * @async
 * @callback utilsCloseCallback
 */

/**
 * Rerender the local Content
 * @async
 * @callback utilsRenderCallback
 * @param {...*} args
 * @return {objectt} find
 */

/**
 * Open and run another frame with the ability to return data.
 * @async
 * @callback utilsCallCallback
 * @param {SFrame} elem
 * @param {*} args
 * @return {callPromise}
 */

/**
 * Embet another Frame
 * @async
 * @callback utilsIncludeCallback
 * @param {SFrame} elem
 * @param {*} args
 * @return {includeFrame}
 */

/////////////////////////////////////////////////////////////////////////
//eventCallbacks
/**
 * Called when Page is fully loaded.
 * @callback eventOnLoadedCallback
 */

/**
 * Will be called and awaited bevor resolving.
 * @async
 * @callback eventOnResolveCallback
 */

/**
 * Will be called and awaited bevor closing.
 * @async
 * @callback eventOnCloseCallback
 */

/**
 * Will be called and awaited bevor rerendering.
 * @async
 * @callback eventOnBeforRerenderCallback
 * @param {...*} args - any given param
 */

/**
 * Will be called and awaited after rerendering.
 * @async
 * @callback eventOnAfterRerenderCallback
 * @param {...*} args - any given param
 */

/**
 * Will be called when included in another Frame and that Frame rerenders.
 * @callback eventOnParentRenderCallback
 */

/**
 * Will be called when included in another Frame and that Frame rerenders.
 * @callback eventOnGlobalRenderCallback
 */

/**
 * @typedef callUtils
 * @type {Object}
 * @property {Object} find - find an element in local tree
 * @property {utilsResolveCallback} resolve - Return the Data
 * @property {utilsCloseCallback} close - Close the Frame
 * @property {utilsRenderCallback} render - Rerender the Frame
 * @property {utilsCallCallback} call - Use another Frame
 * @property {utilsIncludeCallback} include - Include another Frame
 * @property {Object} event - local Events
 * @property {eventOnLoadedCallback} event.onloaded
 * @property {eventOnResolveCallback} event.onresolve
 * @property {eventOnCloseCallback} event.close
 * @property {eventOnBeforRerenderCallback} event.onBeforRerender
 * @property {eventOnAfterRerenderCallback} event.onAfterRerender
 * @property {eventOnParentRenderCallback} event.onParentRender
 * @property {eventOnGlobalRenderCallback} event.onGlobalRenderRequest
 */

/**
 * This callback will be called, when a frame should be opened.
 * @callback callCallback
 * @param {Stear} stear
 * @param {callUtils} utils - lots of utils for Frame manipulation
 * @param {*} args
 */

/**
 * SFrame class
 */
export class SFrame{
    #preRender;
    #call;

    /**
     * 
     * @param {Object} args
     * @param {callCallback} args.call 
     * @param {boolean} [args.preRender] 
     */
    constructor({ call, preRender = true }){
        this.#preRender = preRender;
        this.#call = call;
    }

    call(stear, args, frames, layer = 1, renderParent = stear.elem){
        let lastRender;
        let renderElem;
        
        let event = { onloaded: () => { }, onclose: ()=>{}, onresolve: () => { }, onBeforRerender: () => { }, onAfterRerender: () => { }, onParentRender:()=>{}, onGlobalRenderRequest:()=>true };
        let find = {};

        let resolved = false;

        async function render(args){
            if(!renderElem) return;
            if (lastRender) if ([...(renderParent.children)].includes(lastRender._)) renderParent.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);

            renderParent.appendChild(now.render);
            lastRender = now;

            now._.style.zIndex = layer;

            for (var member in find) delete find[member];
            Object.assign(find, now.find);
            return lastRender;
        }

        const ppp =  new callPromise(async (res,rej)=>{
            const globalRegister = {
                globalRenderRequest: async (...args)=>{
                    const arg = await event.onGlobalRenderRequest(...args);
                    if(arg===false) return;
                    await options.render(arg);
                }
            }
            frames.push(globalRegister);
            const options = {
                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 && [...(renderParent.children)].includes(lastRender._)) renderParent.removeChild(lastRender._);
                    let i = frames.indexOf(globalRegister);
                    if(i>-1)frames.splice(i,1);
                    res(r);
                },
                call: (elem, args = {}) => {
                    return stear.call(elem, args, layer + 1);
                },
                close: async () => {
                    await event.onclose();
                    if (lastRender && [...(renderParent.children)].includes(lastRender._)) renderParent.removeChild(lastRender._);
                },
                include: (frame, args = {}) => {
                    let iFrame = new includeFrame(stear, frame, layer + 1, args);
                    return iFrame;
                },
                event,
            };
            window.queueMicrotask(() => ppp.opts = options); 
            let firstRender = false;
            renderElem = await this.#call(stear, options, args);
            if(!renderElem) {
                
            }else{
                if (this.#preRender | firstRender) await render([]);
                event.onloaded();
            }      
        });
        return ppp;
    }

}

/** Create a SWindow, a Fullscreen Frame. */
export class SWindow extends SFrame{

    #Frame;
    
    /**
     * 
     * @param {Object} args
     * @param {callCallback} args.call 
     * @param {boolean} [args.preRender] 
     */
    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;
    }
    
}

/**
 * @typedef renderNodeSettings
 * @type {Object}
 * @property {string}[type]
 * @property {string}[find]
 * @property {Object}[event]
 * @property {Object}[attr]
 */

/** Create a Render node, */
export class class_ {
    #elem;
    #childs;
    #build;
    #find;
    #doBuild;

    /**
     * Generate a new Stear render Node.
     * 
     * @param {renderNodeSettings} settings 
     * @param {(LanguagePoolString|string|class_)[]} childs 
     * @param {boolean} doBuild 
     */
    constructor(settings,childs,doBuild = true){
        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 if (key == "attr"){
                Object.entries(settings[key]).forEach(([k, d]) => {
                    this.#elem.setAttribute(k, d);
                });
            } else {
                this.#elem.setAttribute(key,settings[key]);
            }
        }
        this.#doBuild = doBuild;
    }

    /**
     * @param {(LanguagePoolString|string|class_)[]} childs
     */
    set childs(childs){
        if (!this.#doBuild) return; 
        this.#childs = Array.isArray(childs) ? childs : [childs];
    }

    /**
     * @param {renderNodeSettings} settings
     */
    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]);
            }
        }
    }

    /**
     * Build Stear Structure
     * 
     * @param {*} args 
     */
    async build (args) {
        if(!this.#doBuild)return;
        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);
            }
        }
    }

    /**
     * Genereate HTML Structure
     * 
     * @return {HTMLElement}
     */
    get render (){
        if (!this.#doBuild) return this.#elem;
        this.#elem.innerHTML = "";
        for (let i = 0; i < this.#build.length; i++) {
            const elem = this.#build[i];
            if (typeof elem == "string" || elem instanceof LanguagePoolString) {
                this.#elem.appendChild(document.createTextNode(String(elem)));
            } else {
                this.#elem.appendChild(elem.render);
            }            
        }
        return this.#elem;
    }

    /**
     * @return {HTMLElement}
     */
    get _ (){
        return this.#elem;
    }

    /**
     * Returns find Object
     * 
     * @return {Object} find
     */
    get find (){
        var out = {}; 
        if (this.#doBuild){ 
                this.#build.forEach(d=>{
                Object.assign(out,d.find);
            });
        }
        if (this.#find) out[this.#find]=this;
        return out;
    }
}

/**
 * 
 * @param {renderNodeSettings} [settings] 
 * @param {(LanguagePoolString|string|class_)[]} [childs]
 * @returns 
 */
export const _ = (settings = {}, childs = []) => new class_(settings, Array.isArray(childs) ? childs : [childs]);
export const s = (type,settings,...childs)=>{
    settings = settings ?? {};
    settings.type = type;
    return new class_(settings,childs);
}

/** includeFrame */
class includeFrame{
    #elem;
    #call;
    /**
     * Call another Frame and generate an includeFrame.
     * 
     * @param {Stear} stear 
     * @param {SFrame} frame 
     * @param {number} layer 
     * @param {*} args 
     */
    constructor(stear,frame,layer, args = {}){
        this.#elem = new class_({},[],false);
        this.#call = stear.include(frame, args, this.#elem._, layer);
        this.#call.then(()=>{

        })
        .catch(()=>{

        });
    }
    
    /**
     * @return {callUtils} utils from included Frame
     */
    get opts(){
        return this.#call.opts;
    }

    /**
     * Close the included Frame.
     */
    close(){
        if(this.#call){
            this.#call.opts.close();
        }
    }

    /**
     * Trigger onParentRender event
     * 
     * @param {*} settings 
     * @returns 
     */
    render(settings={}){
        this.#elem.settings = settings;
        this.#call.opts.event.onParentRender();
        return this.#elem;
    }
    
};