((window)=>{
    function render(...entries)
    {
        let content = {};
        let domContainer = document.createElement('div');
        renderTreeQueQue(
            domContainer,
            entries,
            content
        );
        return domContainer;
    };
    function renderTreeQueQue(domContainer, entries, content)
    {
        if(!content._renderPlanned)
        {
            requestAnimationFrame(()=>{
                createTree(
                    domContainer,
                    entries,
                    content
                )
            });
            content._renderPlanned = true;
        }
    };
    
    function createTree(domContainer, entries, content)
    {
        let root = é(entries[0]);
        RenderElement(domContainer, root);
    }
    /**
     * @param {vnode} data
     */
    function RenderElement(parent, data)
    {
        let elem;
        if(
            (typeof data == "boolean" && !data) ||
            data == null ||
            data === undefined
        )
        {
            return document.createDocumentFragment()
        };
        if(data.type == é.type)
        {
            if(typeof data.companent == "string")
            {
                elem = document.createElement(data.companent);
                for (const [name,value] of Object.entries(data.props))
                {
                    if(["key","children"].includes(name))
                    {
                        continue;
                    }
                    if(name.startsWith('on'))
                    {
                        elem.addEventListener(name.slice(2),value)
                    }
                    else
                    {
                        elem.setAttribute(name, value)
                    }
                };
            }
            else if(typeof data.companent == "function")
            {
                let companent = RenderCompanent(data);
                elem = RenderCompanentScope(null, companent)
            }
            else if(typeof data.companent == "string")
            {
                elem = document.createTextNode(companent);
            }
            else if(!data.companent)
            {
                elem = document.createDocumentFragment()
            };
            if(data.props && data.props.children instanceof Array)
            {
                for (const companent of (data.props.children||[]))
                {
                    if( typeof companent == "string" )
                    {
                        elem.append(document.createTextNode(companent));
                    }
                    else
                    {
                        RenderCompanentScope(elem, companent);
                    }
                }
            }
        }else if(data.$){
            elem = document.createElement(data.$ || "div");
            for (const [name,value] of Object.entries(data)) {
                switch(name)
                {
                    case "$":
                        break;
                    case "in":
                        break;
                    default:
                    {
                        if(name.startsWith('on'))
                        {
                            elem.addEventListener(name.slice(2),value)
                        }
                        else
                        {
                            elem.setAttribute(name, value)
                        }
                    };
                }
            };
            if(data.in)
            {
                if(data.in instanceof Array)
                {
                    for (const companent of (data.in||[])) {
                        if(
                            typeof companent == "string"
                        )
                        {
                            elem.append(document.createTextNode(companent));
                        }
                        else
                        {
                            RenderCompanentScope(elem, companent)
                        }
                    }
                }else{
                    if(
                        typeof data.in == "string"
                    )
                    {
                        elem.append(document.createTextNode(data.in));
                    }
                    else
                    {
                        RenderCompanentScope(elem, companent)
                    }
                }
            }
            data.parent = parent;
            data.dom = elem;
        }
        else if(data instanceof Array)
        {
            if(parent)
            {
                for (const vdata of data.flat(Infinity)) {
                    RenderCompanentScope(parent, vdata)
                };
            }
            else
            {
                let d = document.createDocumentFragment();
                for (const vdata of data.flat(Infinity)) {
                    RenderCompanentScope(d, vdata)
                };
                elem = d;
            }
        }
        else if(typeof data == "string")
        {
            elem = document.createTextNode(data);
        };
        data._render = false;
        if(parent)
        {
            parent.append(elem);
        }
        else
        {
            return elem;
        }
    }
    
    function RenderCompanentScope(data)
    {
        useCompanent(data);
        let result = data.companent(data.props);
        useCompanent(undefined);
        return result;
    };
    function clone(original)
    {
        if(Array.isArray(original))
        {
            let e = [];
            for (const original of original) {
                // Klonlanabilirlik
            }
        }
    }
    function checkSyncRender(data)
    {
        // İki kompanentin farkına bakılmalı ve yeniden çizilmeleri gerekiyor
    }
    function scheduleRender(data)
    {
        if(scheduleRender.planned)
        {
            scheduleRender.items.push(data);
            return;
        };
        requestAnimationFrame(()=>{
            scheduleRender.planned = false;
            checkSyncRender(data)
        });
        scheduleRender.planned = true;
    };
    scheduleRender.planned = false;
    scheduleRender.items = [];
    function é(a,b)
    {
        if(a instanceof Array)
        {
            let t = b instanceof Array ? b : [];
            for (const _a of a) {
                if(_a instanceof Array)
                {
                    é(_a, t);
                }else{
                    t.push(é(_a));
                }
            };
            t = t.flat(Infinity);
            return é({
                $: é.fragment,
                in: t
            })
        }
        if(a.type == é.type)
        {
            return a;
        }
        let t = vnode(), companent, key, props = {};
        if(typeof a == "function")
        {
            t.companent = a;
            t.key = b && ('key' in b) ? b.key : undefined;
            t.props = b;
        }else if(typeof a == "string"){
            t.companent = null;
            t.props = {
                children: [a]
            };
        }else if('$' in a){
            props = {};
            for (const index of Object.keys(a)) {
                switch(index)
                {
                    case "$": companent = a[index]; break;
                    case "in":{
                        if(a[index] instanceof Array)
                        {
                            props.children = a[index].map((child) => {
                                let item = é(child);
                                item.parent = t;
                                return item;
                            });
                        }else{
                            let child = é(a[index]);
                            child.parent = t;
                            props.children = [child]
                        }
                        break
                    };
                    case "key": key = a[index]; break;
                    default:{
                        props[index] = a[index];
                    }
                }
            };
            t.companent = companent;
            t.key = key;
            t.props = props;
        }else{
            throw new Error("Unknown companent type")
        }
        return t;
    };
    é.type = Symbol("élement");
    é.fragment = Symbol("framént");

    let currentCompanent;
    let currentCompanentStateIndex = 0;

    function useCompanent(vnode)
    {
        currentCompanent = vnode;
        currentCompanentStateIndex = 0;
    };

    function useState(initial)
    {
        let companent = currentCompanent;
        let id = currentCompanentStateIndex++;
        let value;
        if(!companent)
        {
            throw new Error("Cannot be used outside of components")
        };
        if(companent._state.length <= id)
        {
            if(typeof initial == "function")
            {
                value = initial();
            }
            else
            {
                value = initial;
            }
            companent._state[id] = value;
        }else
        {
            value = companent._state[id];
        };
        return [
            value,
            newValue => {
                if(typeof newValue == "function")
                {
                    value = newValue();
                }
                if(!Object.is(newValue, value))
                {
                    companent._state[id] = value;
                    companent._render = true;
                    scheduleRenderCompanent(companent);
                }
            }
        ]
    };
    é.useState = useState;
    
    function vnode()
    {
        return {
            type: é.type,
            // Raw render requirements
            parent: undefined,
            key: undefined,
            companent: undefined,
            props:{},
            // Companent requirements
            ref: undefined,
            dom: undefined,
            _state: [],
            _hooks: [],
            _render: true,
            context: undefined
        }
    };
    window.é = é;
    window.render = render;
})(window)