// Admin functionality for rphotos
function rpadmin() {
    var details = document.querySelector('.details');

    function rotate(event) {
	var imgid = details.dataset.imgid;
	var angle = event.target.dataset.angle;
        var r = new XMLHttpRequest();
        document.body.classList.add('busy');
        r.open('POST', '/adm/rotate');
        r.onload = function() {
            if (r.status === 200) {
		// Yay!
		document.location.reload(true);
            } else {
		alert("Rotating failed: " + r.status);
            }
            document.body.classList.remove('busy');
        }
        r.onerror = function() {
	    alert("Rotating failed.");
            document.body.classList.remove('busy');
        }
        r.ontimeout = function() {
	    alert("Rotating timed out");
            document.body.classList.remove('busy');
        }
        r.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        r.send("angle=" + angle + "&image=" + imgid)
    }

    var list;

    function tag_form(event) {
	event.target.disabled = true;
	var imgid = details.dataset.imgid;
	var f = document.createElement("form");
	f.action = "/adm/tag";
	f.method = "post";
	var i = document.createElement("input");
	i.type="hidden";
	i.name="image";
	i.value = imgid;
	f.appendChild(i);
	i = document.createElement("input");
	i.type = "text";
        i.autocomplete="off";
        i.tabindex="1";
	i.name = "tag";
	i.addEventListener('keyup', do_complete);
	f.appendChild(i);
	list = document.createElement("div");
	list.className = "completions";
	f.appendChild(list);
        f.addEventListener('keypress', e => {
            let t = e.target;
            switch(e.code) {
            case 'ArrowUp':
	        (t.parentNode == list && t.previousSibling || list.querySelector('a:last-child')).focus();
	        break;
            case 'ArrowDown':
	        (t.parentNode == list && t.nextSibling || list.querySelector('a:first-child')).focus();
	        break;
            case 'Escape':
	        i.focus();
	        break;
            default:
	        return true;
            };
            e.preventDefault();
            e.stopPropagation();
            return false;
        });
	meta.appendChild(f);
        i.focus();
    }

    function do_complete(e) {
        let c = e.code;
        if (c == 'ArrowUp' || c == 'ArrowDown' || c == 'Escape' || c == 'Enter') {
            return true;
        }
        let v = e.target.value;
        if (v.length > 0) {
            let r = new XMLHttpRequest();
            r.onload = function() {
                let t = JSON.parse(this.responseText);
                list.innerHTML = '';
                t.map(x => {
                    let a = document.createElement('a');
                    a.innerHTML = x;
                    a.tabIndex = 2;
                    a.onclick = function() {
                        e.target.value = x;
                        list.innerHTML = '';
                    }
                    list.appendChild(a)
                })
            };
            r.open('GET', document.location.origin + '/ac?q=' + encodeURIComponent(v));
            r.send(null);
        } else {
            list.innerHTML = '';
        }
        e.preventDefault();
        e.stopPropagation();
        return false;
    }

    var meta = details.querySelector('.meta');
    if (meta) {
	p = document.createElement("p");
	r = document.createElement("button");
	r.onclick = rotate;
	r.innerHTML = "\u27f2";
	r.dataset.angle = "-90";
	r.title = "Rotate left";
	p.appendChild(r);
	p.appendChild(document.createTextNode(" "));
	r = document.createElement("button");
	r.onclick = rotate;
	r.innerHTML = "\u27f3";
	r.dataset.angle = "90";
	r.title = "Rotate right";
	p.appendChild(r);

	p.appendChild(document.createTextNode(" "));
	r = document.createElement("button");
	r.onclick = tag_form;
	r.innerHTML = "🏷";
	r.title = "Tag photo";
	p.appendChild(r);
	meta.appendChild(p);
    }
}