// Timeline drag and drop
const tl_cont_attr = {id:"tl_cont", ondrop: "drop(event, this)", ondragover:"allowDrop(event)"};
const tl_drag_attr = {id:"tl_drag", draggable:"true", ondragstart:"drag(event, this)"};

// Config
var timeline_color_cursor = "#FF8839";
var timeline_color_bg = "#2EB8E6";

var src_id = "";
var medias_status = {};

function updatePlaylist(){
    var new_list = [];
    var media_count = document.getElementById("timeline").children.length;
    for (i=media_count,l=0;i>l;i--) {
	//~ new_list.push(document.getElementById("timeline").children[i].children[0].getAttribute("media_id"));
	toMove = document.getElementById("timeline").children[i-1].children[0].getAttribute("media_id");
	console.log(toMove);
	sendCmd("/all/move/" + toMove + "/1");
    }  
}

function findTargetIndex(element, index, array, thisArg){
  if (element == this) {
  	return index+1;
  }
  return 0;
};

function moveElements(target) {
    var elem_list = Array.from(src_id.parentElement.children);
    var elem_list_slice = elem_list;
    var source_idx = elem_list.findIndex(findTargetIndex, src_id);
    var target_idx = elem_list.findIndex(findTargetIndex, target);
    var idx;
    if (source_idx < target_idx) {
        elem_list_slice = elem_list.slice(source_idx+1, target_idx+1);
      idx = source_idx;
    } else {
      elem_list_slice = elem_list.slice(target_idx, source_idx );
      idx = target_idx+1;
    }
    for (i=0, l=elem_list_slice.length; i<l;i++) {
      elem_list[idx+i].appendChild(elem_list_slice[i].children[0]);
    }
    return target;
};

function allowDrop(ev) {
  ev.preventDefault();
  drop_id = ev.dataTransfer.getData("text");
};

function drag(ev, source) {
  src_id = ev.target.parentElement;
  ev.dataTransfer.setData("text", ev.target.id);
};

function drop(ev, target) {
  ev.preventDefault();
  var data = ev.dataTransfer.getData("text");
  if (src_id.id != target.id) {
        dropTarget = moveElements(target);
        if (dropTarget) {
            dropTarget.appendChild(document.getElementById(data));
	    updatePlaylist();
        }
  }
  
};

function adjustTl() {
    var child = document.getElementById('timeline').children;
    var divWidth = 100 / child.length;
    for (i=0, l=child.length;i<l;i++) {
      child[i].style.width= divWidth + "%";
    }
};

function addAttr(id, attr, val , child=-1) {
    var elem = document.getElementById(id);
    if (child>-1){
	elem = elem.children[child];
    }
    var att = document.createAttribute(attr);
    att.value = val;
    elem.setAttributeNode(att);
};

function addElement(type, attr, meta = 0, j = 0){
  var elem = document.createElement(type);
  var keys_array = Object.keys(attr);
  for (i=0, l=keys_array.length;i<l;i++) {
    var att = document.createAttribute(keys_array[i]);
    if(!i){
	att.value = Object.values(attr)[i]+j;
    } else {
	att.value = Object.values(attr)[i];
    }
    elem.setAttributeNode(att);
  }
  // Set playlist id attribute
  if (meta) {
      att = document.createAttribute("media_id");
      att.value = meta[0];
      elem.setAttributeNode(att);
  }
  // Get filename 
  elem.innerText = meta[1];
  return elem;
};

var scanInterval = 3000;
// Bouttons de commande
addEventListener("DOMContentLoaded", function() {
    sendCmd("/scan");
    sendCmd("/browse");
    sendCmd("/all/rssi");
    sendCmd("/all/list");
    adjustTl();
    // Tous les elements avec la classe ".command"
    var commandButtons = document.querySelectorAll(".command");
    for (var i=0, l=commandButtons.length; i<l; i++) {
	var button = commandButtons[i];
	// Sur un click
	button.addEventListener("click", function(event) {
	  // On intercepte le signal
	    event.preventDefault();
	      // On recupere la valeur de value="" sur le bouton
	    var clickedButton = event.currentTarget;
	    var command = clickedButton.value;
	    if ( command.indexOf("/reboot" ) > -1  ||  command.indexOf("/poweroff") > -1 ) {
		if ( !confirm("Êtes vous certain de vouloir effectuer cette action ?") ) {
		    return 0;
		}
	    } else if ( command == "/scan" ) {
		document.getElementById("status_all").innerHTML = "Searching network for live hosts...";
	    } else if ( command.indexOf("/sort") > -1 ){ 
		if (command.indexOf('/1/') > -1 ) {
		    clickedButton.value = clickedButton.value.replace('/1/','/0/')
		} else {
		    clickedButton.value = clickedButton.value.replace('/0/','/1/')
		}
	    } else if ( command.indexOf("/move") > -1 ) {
		const test_array = [21,19,20];
		for (i=test_array.length, l=0;i>l;i--){
		    console.log(test_array[i-1]);
		    sendCmd("/all/move/" + test_array[i-1] + "/1");
		};
		sendCmd("/all/list");    
		//setInterval( sendCmd, scanInterval, "/all/move/16/1");
	    };

	      // On envoie la commande en AJAX
	    var request = new XMLHttpRequest();
	    if ( command == "/scan" ) {
		request.onload = sendCmd(command);
	    }
	    // On construit la commande
	    request.open("GET", command, true);
	    // et on l'envoie
	    request.send();
	});
    }
}, true);

// Affichage des infos
function parseResult(command, infos_array) {
    switch (command) {
	case "/all/status": 
	    // Iterate over array
	    for (var i = 0, l=infos_array.length; i<l; i++) {
		// Get filename, time/length
		document.getElementById("status_"+infos_array[i].host).innerHTML = infos_array[i].file + " <br/> " + infos_array[i].time + " / " + infos_array[i].leng;
		medias_status[infos_array[i].id] = infos_array[i].pos;
		// Find currently playing element
		//~ var pl_length = document.getElementById("timeline").getAttribute("length");
		//~ for (j=0,k=pl_length;j<k;j++){
		    //~ if (document.getElementById("timeline").children[j].children[0].getAttribute('media_id') == infos_array[i].id ) {
			//~ addAttr(document.getElementById("timeline").children[j].children[0].id, "pos", infos_array[i].pos); 
		    //~ }
		//~ };
		//~ document.getElementById("timeline").children[0].children[0].hasAttribute('media_id')
		// Toggle loop indicator
		if (infos_array[i].loop == "true") { 
		    document.getElementById("loop_ind_" + infos_array[i].host).style.backgroundColor = "#78E738"
		} else {
		    document.getElementById("loop_ind_" + infos_array[i].host).style.backgroundColor = "#A42000"
		};
		// Toggle repeat indicator
		if (infos_array[i].repeat == "true") { 
		    document.getElementById("repeat_ind_" + infos_array[i].host).style.backgroundColor = "#78E738"
		} else {
		    document.getElementById("repeat_ind_" + infos_array[i].host).style.backgroundColor = "#A42000"
		};
	    };
	    break;
	case "/all/list":
	    
	    for (var i = 0, l=infos_array.length; i<l; i++) {
		// Fill Playlist infos
		document.getElementById("playlist_"+infos_array[i].host).innerHTML = infos_array[i].leng + " item(s) in playlist - " + infos_array[i].duration;
		// Build html table and timeline
		var items_array = Array.from(infos_array[i].items);
		//console.log(items_array.length);
		if (items_array.length == 0){
		    var child_list = Array.from(document.getElementById("timeline").children);
		    for(i=0,l=child_list.length;i<l;i++){
		      document.getElementById("timeline").removeChild(child_list[i]);
		    };
		    break;
		}
		var html_table  = "<table>" + 
				    "<tr>" + 
					    "<th>Id</th>" + 
					    "<th>Filename</th>" + 
					    "<th>Duration</th>" + 
				    "</tr>";
		for (var j = 0, k=items_array.length; j<k; j++) {
		    // Table
		    item_meta = items_array[j].split(';');
		    html_table += "<tr>" + 
					"<td>" + item_meta[0] + "</td>" +
					"<td>" + item_meta[1] + "</td>" + 
					"<td>" + item_meta[2] + "</td>" + 
				  "</tr>" ;
		    // Timeline
		    var child_node = addElement("div", tl_drag_attr, item_meta, j);
		    var len = document.getElementById("timeline").children.length;
		    addAttr("timeline", "length", len);
		    if ( len < items_array.length ) {
			document.getElementById("timeline").appendChild( addElement("div", tl_cont_attr, 0, len) );
		    } 
		    document.getElementById(tl_cont_attr.id + j).replaceChildren(child_node);
		    // Adjust elements width
		    adjustTl();
		    // Highlight currently playing element
		    if (item_meta[3] != ""){
			document.getElementById(tl_cont_attr.id + j).children[0].style.borderBottom = "4px solid " + timeline_color_cursor;
			document.getElementById(tl_cont_attr.id + j).children[0].style.fontWeight = "bold";
			var pos = medias_status[item_meta[0]] * 100;
			//~ pos = pos.toPrecision(2);
			var pos1 = pos-1  + "%";
			pos = pos + "%";
			//console.log( "linear-gradient(90deg," + timeline_color2 + " " + pos1 + ", " + timeline_color1 + " " + pos + ", " + timeline_color2 + " " + pos + ")" );
			document.getElementById(tl_cont_attr.id + j).children[0].style.background = "linear-gradient(90deg," + timeline_color_bg + " " + pos1 + ", " + timeline_color_cursor + " " + pos + ", " + timeline_color_bg + " " + pos + ")";
		    }
		}
		html_table += "</table>";
		document.getElementById("playlist_"+infos_array[i].host).innerHTML += html_table;
	    };
	    break;
	case "/scan":
	    var host_up = infos_array[0];
	    var host_down = infos_array[1];
	    for ( var i=0, l=host_up.length; i<l; i++){
		    document.getElementById(host_up[i]).style.display = 'block';
	    }
	    for ( var i=0, l=host_down.length; i<l; i++){
		    document.getElementById(host_down[i]).style.display = 'none';
	    }
	    if (host_up.length) { 
		    scanInterval = 10000;
		    document.getElementById("status_all").innerHTML = "Scan intarvel set to " + scanInterval;
	    }
	    document.getElementById("status_all").innerHTML = host_up.length + " client(s).";
	    break;
	case "/browse":
	    var html_table  = "<table>" + 
			       "<tr>" + 
				    "<th>Filename</th>" + 
				    "<th>Duration</th>" + 
			       "</tr>";
	    for (var j = 0, k=infos_array.length; j<k; j++) {
		    html_table += "<tr>" + 
					"<td>" + infos_array[j] + "</td>" +
					"<td>" + "00:00" + "</td>" +
				  "</tr>" ;
	    }
	    html_table += "</table>";
	    document.getElementById("filelist").innerHTML = html_table;
	    break;
	case "/all/rssi":
	    var signal_color = 40;
	    var best_rssi = 30;
	    var worst_rssi = 70;
	    for (var j = 0, k=infos_array.length; j<k; j++) {
		var rssi_norm = Math.ceil( (worst_rssi - parseInt(infos_array[j].rssi) ) / ( worst_rssi - best_rssi ) * 4 );
		signal_color = (rssi_norm-1) * signal_color;
		// Reset to grey
		for (i=0, l=4; i<l;i++) {
		    document.getElementById("wl_"+i).style.backgroundColor = "hsl(0, 0%, 65%)";
		};
		// Color it
		for (i=0, l=rssi_norm; i<l;i++) {
		    document.getElementById("wl_"+i).style.backgroundColor = "hsl(" + signal_color + ", 100%, 50%)";
		};
	    };
	    break;
    }; // End switch case
};

function sendCmd(command) {
    var request = new XMLHttpRequest();
    request.onload = function() {
	if (request.readyState === request.DONE) {
	    if (request.status === 200) {
	    // responseText is a string, use parse to get an array.
		var infos_array = JSON.parse(request.responseText);  
		//console.log(infos_array);
		parseResult(command, infos_array);
		//return infos_array;
	    };
	};
    };
    // On construit la commande
    request.open("GET", command, true);
    // et on l'envoie
    request.send();     
};

setInterval( sendCmd, 500, "/all/status");
setInterval( sendCmd, 1000, "/all/list");
setInterval( sendCmd, scanInterval, "/scan");
setInterval( sendCmd, 20000, "/all/rssi");