const set_image_expand = (x, set) => {
    const matches = /i\/(thumb\/)?(\d+\.\w+)$/i.exec(x.getAttribute("src"));

    if(matches[1])
    {
	//Is thumbnail
	if(set===true || set===undefined)
	    x.setAttribute("src", "i/"+matches[2]);
    }
    else {
	//Is full
	if(set===false || set===undefined)
	    x.setAttribute("src", "i/thumb/"+matches[2]);
    }
};

window.addEventListener('load', () => {
    document.querySelectorAll(".thread").forEach(x=> x.classList.toggle("hidden"));
    document.querySelectorAll(".script").forEach(x=> x.style=""); //unhide script-specific elements

    document.querySelectorAll(".expand").forEach(x=> {
	x.addEventListener("click", ()=> { 
	    document.querySelector("[id='"+ x.getAttribute("href").slice(1) +"']").classList.toggle("hidden");
	});
    });

    document.querySelectorAll("figure > img").forEach(x=> {
	x.addEventListener("click", ()=> {
	    set_image_expand(x);
	});
    });

    //nav buttons
    document.querySelector("#expand_all_threads").addEventListener("click", () => {
	document.querySelectorAll("section.hidden").forEach(x=> {
	    x.classList.toggle("hidden");
	});
    });
    document.querySelector("#collapse_all_threads").addEventListener("click", () => {
	document.querySelectorAll("section:not(.hidden)").forEach(x=> {
	    x.classList.toggle("hidden"); 
	});
    });
    document.querySelector("#expand_all_images").addEventListener("click", () => {	
	document.querySelectorAll("figure > img").forEach(x=> {
	    set_image_expand(x, true);
	});
    });
    document.querySelector("#collapse_all_images").addEventListener("click", () => {
	document.querySelectorAll("figure > img").forEach(x=> {
	    set_image_expand(x, false);
	});
    });
});