interface OptionsElement {//OptionsElement<x>
  generateHTML():HTMLElement;
  submit:()=>void;
  //watchForChange:(func:(arg1:x)=>void)=>void
}
//future me stuff
class Buttons implements OptionsElement{
    readonly name:string;
    readonly buttons:[string,Options|string][];
    buttonList:HTMLDivElement;
    warndiv:HTMLElement;
    constructor(name:string){
        this.buttons=[];
        this.name=name;
    }
    add(name:string,thing:Options|undefined=undefined){
        if(!thing){thing=new Options(name,this)}
        this.buttons.push([name,thing]);
        return thing;
    }
    generateHTML(){
        const buttonList=document.createElement("div");
        buttonList.classList.add("Buttons");
        buttonList.classList.add("flexltr");
        this.buttonList=buttonList;
        const htmlarea=document.createElement("div");
        htmlarea.classList.add("flexgrow");
        const buttonTable=document.createElement("div");
        buttonTable.classList.add("flexttb","settingbuttons");
        for(const thing of this.buttons){
            const button=document.createElement("button");
            button.classList.add("SettingsButton");
            button.textContent=thing[0];
            button.onclick=_=>{
                this.generateHTMLArea(thing[1],htmlarea);
                if(this.warndiv){
                    this.warndiv.remove();
                }
            }
            buttonTable.append(button);
        }
        this.generateHTMLArea(this.buttons[0][1],htmlarea);
        buttonList.append(buttonTable);
        buttonList.append(htmlarea);
        return buttonList;
    }
    handleString(str:string):HTMLElement{
        const div=document.createElement("span");
        div.textContent=str;
        return div;
    }
    private generateHTMLArea(buttonInfo:Options|string,htmlarea:HTMLElement){
        let html:HTMLElement;
        if(buttonInfo instanceof Options){
            html=buttonInfo.generateHTML();
        }else{
            html=this.handleString(buttonInfo);
        }
        htmlarea.innerHTML="";
        htmlarea.append(html);
    }
    changed(html:HTMLElement){
        this.warndiv=html;
        this.buttonList.append(html);
    }
    save(){}
    submit(){

    }
}


class TextInput implements OptionsElement{
    readonly label:string;
    readonly owner:Options;
    readonly onSubmit:(str:string)=>void;
    textContent:string;
    input:WeakRef<HTMLInputElement>
    constructor(label:string,onSubmit:(str:string)=>void,owner:Options,{initText=""}={}){
        this.label=label;
        this.textContent=initText;
        this.owner=owner;
        this.onSubmit=onSubmit;
    }
    generateHTML():HTMLDivElement{
        const div=document.createElement("div");
        const span=document.createElement("span");
        span.textContent=this.label;
        div.append(span);
        const input=document.createElement("input");
        input.value=this.textContent;
        input.type="text";
        input.oninput=this.onChange.bind(this);
        this.input=new WeakRef(input);
        div.append(input);
        return div;
    }
    private onChange(ev:Event){
        this.owner.changed();
        const input=this.input.deref();
        if(input){
            const value=input.value as string;
            this.onchange(value);
            this.textContent=value;
        }
    }
    onchange:(str:string)=>void=_=>{};
    watchForChange(func:(str:string)=>void){
        this.onchange=func;
    }
    submit(){
        this.onSubmit(this.textContent);
    }
}

class ButtonInput implements OptionsElement{
    readonly label:string;
    readonly owner:Options;
    readonly onClick:()=>void;
    textContent:string;
    constructor(label:string,textContent:string,onClick:()=>void,owner:Options,{}={}){
        this.label=label;
        this.owner=owner;
        this.onClick=onClick;
        this.textContent=textContent;
    }
    generateHTML():HTMLDivElement{
        const div=document.createElement("div");
        const span=document.createElement("span");
        span.textContent=this.label;
        div.append(span);
        const button=document.createElement("button");
        button.textContent=this.textContent;
        button.onclick=this.onClickEvent.bind(this);
        div.append(button);
        return div;
    }
    private onClickEvent(ev:Event){
        this.onClick();
    }
    watchForChange(){}
    submit(){}
}

class ColorInput implements OptionsElement{
    readonly label:string;
    readonly owner:Options;
    readonly onSubmit:(str:string)=>void;
    colorContent:string;
    input:WeakRef<HTMLInputElement>
    constructor(label:string,onSubmit:(str:string)=>void,owner:Options,{initColor=""}={}){
        this.label=label;
        this.colorContent=initColor;
        this.owner=owner;
        this.onSubmit=onSubmit;
    }
    generateHTML():HTMLDivElement{
        const div=document.createElement("div");
        const span=document.createElement("span");
        span.textContent=this.label;
        div.append(span);
        const input=document.createElement("input");
        input.value=this.colorContent;
        input.type="color";
        input.oninput=this.onChange.bind(this);
        this.input=new WeakRef(input);
        div.append(input);
        return div;
    }
    private onChange(ev:Event){
        this.owner.changed();
        const input=this.input.deref();
        if(input){
            const value=input.value as string;
            this.onchange(value);
            this.colorContent=value;
        }
    }
    onchange:(str:string)=>void=_=>{};
    watchForChange(func:(str:string)=>void){
        this.onchange=func;
    }
    submit(){
        this.onSubmit(this.colorContent);
    }
}

class SelectInput implements OptionsElement{
    readonly label:string;
    readonly owner:Options;
    readonly onSubmit:(str:number)=>void;
    options:string[];
    index:number;
    select:WeakRef<HTMLSelectElement>
    constructor(label:string,onSubmit:(str:number)=>void,options:string[],owner:Options,{defaultIndex=0}={}){
        this.label=label;
        this.index=defaultIndex;
        this.owner=owner;
        this.onSubmit=onSubmit;
        this.options=options;
    }
    generateHTML():HTMLDivElement{
        const div=document.createElement("div");
        const span=document.createElement("span");
        span.textContent=this.label;
        div.append(span);
        const select=document.createElement("select");

        select.onchange=this.onChange.bind(this);
        for(const thing of this.options){
            const option = document.createElement("option");
            option.textContent=thing;
            select.appendChild(option);
        }
        this.select=new WeakRef(select);
        select.selectedIndex=this.index;
        div.append(select);
        return div;
    }
    private onChange(ev:Event){
        this.owner.changed();
        const select=this.select.deref();
        if(select){
            const value=select.selectedIndex;
            this.onchange(value);
            this.index=value;
        }
    }
    onchange:(str:number)=>void=_=>{};
    watchForChange(func:(str:number)=>void){
        this.onchange=func;
    }
    submit(){
        this.onSubmit(this.index);
    }
}
class MDInput implements OptionsElement{
    readonly label:string;
    readonly owner:Options;
    readonly onSubmit:(str:string)=>void;
    textContent:string;
    input:WeakRef<HTMLTextAreaElement>
    constructor(label:string,onSubmit:(str:string)=>void,owner:Options,{initText=""}={}){
        this.label=label;
        this.textContent=initText;
        this.owner=owner;
        this.onSubmit=onSubmit;
    }
    generateHTML():HTMLDivElement{
        const div=document.createElement("div");
        const span=document.createElement("span");
        span.textContent=this.label;
        div.append(span);
        div.append(document.createElement("br"));
        const input=document.createElement("textarea");
        input.value=this.textContent;
        input.oninput=this.onChange.bind(this);
        this.input=new WeakRef(input);
        div.append(input);
        return div;
    }
    onChange(ev:Event){
        this.owner.changed();
        const input=this.input.deref();
        if(input){
            const value=input.value as string;
            this.onchange(value);
            this.textContent=value;
        }
    }
    onchange:(str:string)=>void=_=>{};
    watchForChange(func:(str:string)=>void){
        this.onchange=func;
    }
    submit(){
        this.onSubmit(this.textContent);
    }
}
class FileInput implements OptionsElement{
    readonly label:string;
    readonly owner:Options;
    readonly onSubmit:(str:FileList|null)=>void;
    input:WeakRef<HTMLInputElement>
    constructor(label:string,onSubmit:(str:FileList)=>void,owner:Options,{}={}){
        this.label=label;
        this.owner=owner;
        this.onSubmit=onSubmit;
    }
    generateHTML():HTMLDivElement{
        const div=document.createElement("div");
        const span=document.createElement("span");
        span.textContent=this.label;
        div.append(span);
        const input=document.createElement("input");
        input.type="file";
        input.oninput=this.onChange.bind(this);
        this.input=new WeakRef(input);
        div.append(input);
        return div;
    }
    onChange(ev:Event){
        this.owner.changed();
        const input=this.input.deref();
        if(this.onchange&&input){
            this.onchange(input.files);
        }
    }
    onchange:((str:FileList|null)=>void)|null=null;
    watchForChange(func:(str:FileList)=>void){
        this.onchange=func;
    }
    submit(){
        const input=this.input.deref();
        if(input){
            this.onSubmit(input.files);
        }
    }
}

class HtmlArea implements OptionsElement{
    submit: () => void;
    html:(()=>HTMLElement)|HTMLElement;
    constructor(html:(()=>HTMLElement)|HTMLElement,submit:()=>void){
        this.submit=submit;
        this.html=html;
    }
    generateHTML(): HTMLElement {
        if(this.html instanceof Function){
            return this.html();
        }else{
            return this.html;
        }
    }
}
class Options implements OptionsElement{
    name:string;
    haschanged=false;
    readonly options:OptionsElement[];
    readonly owner:Buttons|Options;
    readonly ltr:boolean;
    constructor(name:string,owner:Buttons|Options,{ltr=false}={}){
        this.name=name;
        this.options=[];
        this.owner=owner;
        this.ltr=ltr;

    }
    addOptions(name:string,{ltr=false}={}){
        const options=new Options(name,this,{ltr});
        this.options.push(options);
        return options;
    }
    addSelect(label:string,onSubmit:(str:number)=>void,selections:string[],{defaultIndex=0}={}){
        const select=new SelectInput(label,onSubmit,selections,this,{defaultIndex});
        this.options.push(select);
        return select;
    }
    addFileInput(label:string,onSubmit:(files:FileList)=>void,{}={}){
        const FI=new FileInput(label,onSubmit,this,{});
        this.options.push(FI);
        return FI;
    }
    addTextInput(label:string,onSubmit:(str:string)=>void,{initText=""}={}){
        const textInput=new TextInput(label,onSubmit,this,{initText});
        this.options.push(textInput);
        return textInput;
    }
    addColorInput(label:string,onSubmit:(str:string)=>void,{initColor=""}={}){
        const colorInput=new ColorInput(label,onSubmit,this,{initColor});
        this.options.push(colorInput);
        return colorInput;
    }
    addMDInput(label:string,onSubmit:(str:string)=>void,{initText=""}={}){
        const mdInput=new MDInput(label,onSubmit,this,{initText});
        this.options.push(mdInput);
        return mdInput;
    }
    addHTMLArea(html:(()=>HTMLElement)|HTMLElement,submit:()=>void=()=>{}){
        const htmlarea=new HtmlArea(html,submit);
        this.options.push(htmlarea);
        return htmlarea;
    }
    addButtonInput(label:string,textContent:string,onSubmit:()=>void){
        const button=new ButtonInput(label,textContent,onSubmit,this);
        this.options.push(button);
        return button;
    }
    generateHTML():HTMLElement{
        const div=document.createElement("div");
        div.classList.add("titlediv");
        if(this.name!==""){
            const title=document.createElement("h2");
            title.textContent=this.name;
            div.append(title);
            title.classList.add("settingstitle");
        }
        const container=document.createElement("div");
        container.classList.add(this.ltr?"flexltr":"flexttb","flexspace");
        for(const thing of this.options){
            container.append(thing.generateHTML());
        }
        div.append(container);
        return div;
    }
    changed(){
        if(this.owner instanceof Options){
            this.owner.changed();
            return;
        }
        if(!this.haschanged){
            const div=document.createElement("div");
            div.classList.add("flexltr","savediv");
            const span=document.createElement("span");
            div.append(span);
            span.textContent="Careful, you have unsaved changes";
            const button=document.createElement("button");
            button.textContent="Save changes";
            div.append(button);
            this.haschanged=true;
            this.owner.changed(div);

            button.onclick=_=>{
                if(this.owner instanceof Buttons){
                    this.owner.save();
                }
                div.remove();
                this.submit();
            }
        }
    }
    submit(){
        this.haschanged=false;
        for(const thing of this.options){
            thing.submit();
        }
    }
}

class Settings extends Buttons{
    static readonly Buttons=Buttons;
    static readonly Options=Options;
    html:HTMLElement|null;
    constructor(name:string){
        super(name);
    }
    addButton(name:string,{ltr=false}={}):Options{
        const options=new Options(name,this,{ltr});
        this.add(name,options);
        return options;
    }
    show(){
        const background=document.createElement("div");
        background.classList.add("background");

        const title=document.createElement("h2");
        title.textContent=this.name;
        title.classList.add("settingstitle")
        background.append(title);

        background.append(this.generateHTML());



        const exit=document.createElement("span");
        exit.textContent="✖";
        exit.classList.add("exitsettings");
        background.append(exit);
        exit.onclick=_=>{this.hide();};
        document.body.append(background);
        this.html=background;
    }
    hide(){
        if(this.html){
            this.html.remove();
            this.html=null;
        }
    }
}

export {Settings,OptionsElement,Buttons,Options}