/**
 * Allows the user to populate upload form using musicbrainz.
 * Popup display code based on example found here http://yensdesign.com/2008/09/how-to-create-a-stunning-and-smooth-popup-using-jquery/
 *
 * @author Gwindow
 *
 * TODO Center dynamically based on scroll position
 */


(function($) {
//global variables
var $year_release_group;
var $release_type;
var $release_group_id;
var $tags;
var $year_release;
var $catalog_number;
var $record_label;
var $searched = false;
// controls popup state
var $popup_state = 0;
var $musicbrainz_state = 0;

$(document).ready(function() {
  loadCSS();
  enableMusicBrainzButton();
  controlPopup();
  
  $("#musicbrainz_button").click(function() {
    var $album = $("#title").val();
    var $artist = $("#artist").val();
    if($artist.length > 0 || $album.length > 0) {
    jQuery('#results1').empty();
    jQuery('#results2').empty();
    jQuery('#results1').show();
    jQuery('#results2').show();
    $searched = true;
    var $artist_encoded = encodeURIComponent($artist);
    var $album_encoded = encodeURIComponent($album);
    $.ajax({
       type: "GET",
       url : "http://www.musicbrainz.org/ws/2/release-group/?query=artist:%22" + $artist_encoded + "%22%20AND%20releasegroup:%22" + $album_encoded + "%22",
       dataType: "xml",
       success: showReleaseGroups
    });

    }
    else { alert("Please fill out artist and/or album fields.");}
  });

  $("#results1").click(function(event) {
    var $id = event.target.id;
    if($id != "results1") {
    jQuery('#results1').hide();
    jQuery('#results2').empty();
    jQuery('#results2').show();
    jQuery('#popup_back').empty();
    $.ajax({
    type: "GET",
    url: "http://musicbrainz.org/ws/2/release-group/" + $id + "?inc=artist-credits%2Breleases+tags+media",
    dataType: "xml",
    success: showReleases
 }); 
}
});
   $("#results2").click(function(event) {
    var $id = event.target.id; 
    if($id != "mb" && $id != "results2") {
    jQuery('#results2').empty();
    jQuery('#results2').show();

    $.ajax({
    type: "GET",
    url: "http://musicbrainz.org/ws/2/release/" + $id + "?inc=artist-credits%2Blabels%2Bdiscids%2Brecordings+tags+media+label-rels",
    dataType: "xml",
    success: populateForm
    });
  }
});

    $("#popup_back").click(function(event) {
    var $id = event.target.id;
    if($id == "back" ) {
    jQuery('#results2').hide();
    jQuery('#results1').show();
    jQuery('#popup_back').empty();
    jQuery('#popup_title').text("Choose Release Group");
    }
   });

   $("#remaster").click(function(event) {
	if($("#remaster").attr("checked") && $searched == true) {
		populateEditionsForm();
	}
        else if($searched == true) {
		depopulateEditionsForm();
	}

	});

   });
/**
 * Shows the release groups
 * @param xml
 */
function showReleaseGroups(xml)
{
    var $count = $(xml).find("release-group-list").attr("count");
    if($count == 0 ) {
        alert("Could not find on MusicBrainz");        
    }
    else {
    	jQuery('#popup_title').text("Choose Release Group");
    	openPopup();
    }
  
  $(xml).find("release-group").each(function()
  {
    var $title = $(this).find("title:first").text();
    var $artist = $(this).find("name:first").text();
    var $type = $(this).attr("type");
    var $score = $(this).attr("ext:score");
    var $releaseId = $(this).attr("id");
    var $result =   $artist + " - " + $title + " [Type: " + $type + ", Score: " + $score + "]"
    $("<a href='#null'>" + $result + "<p/>").attr("id", $releaseId).appendTo("#results1");
  });
}

/**
 * Shows releases inside a release group
 * @param xml
 */
function showReleases(xml) {
    var $date_release_group = $(xml).find("first-release-date").text();
    $year_original = $date_release_group.substring(0,4);
    $release_type = $(xml).find("release-group").attr("type");
    $release_group_id = $(xml).find("release-group").attr("id");
    jQuery('#popup_title').html("Choose Release " + "<a href='http://musicbrainz.org/release-group/" 
    		+ $release_group_id + "'target=_new>(View on MusicBrainz)</a>");
      jQuery('#popup_back').html("<a href='#null' id='back'>[Go Back]</a>");
    
	$(xml).find("release").each(function()
	{
    var $release_id = $(this).attr("id");
	var $title = $(this).find("title").text();
	var $status = $(this).find("status").text();
	var $date = $(this).find("date").text();
	var $year = $date.substring(0,4);
	var $country = $(this).find("country").text();
	var $format; var $tracks;
	$(this).find("medium-list").each(function() {
	$(this).find("medium").each(function() {
	$format = $(this).find("format").text();
	$(this).find("track-list").each(function() {
	$tracks = $(this).attr("count");
	}); }); });
	var $result =  $title + " [Year: " + $year + ", Format: " + $format + ", Tracks: " + $tracks + ", Country: " + $country + "]";
	$("<a href='#null'>" + $result +  "</a>").attr("id", $release_id).appendTo("#results2");
	
	$("<a href='http://musicbrainz.org/release/" + $release_id +"' target=_new> (View on MB)</a>" + "<p/>").attr("id", "mb").appendTo("#results2");
	});
	
	parseTags(xml);
}
    /**
     * Parses the tags to the gazelle conventions
     * @param xml
     */
    function parseTags(xml) {
	  $tags = "";
	  $(xml).find("tag").each(function() {
		$tag =  cleanTag($(this).find("name").text());
	        if(isValidTag($tag)) {        
            		$tags += "," + $tag;
           	}
	});
	if($tags.charAt(0) == ',') { 
                $tags = $tags.substring(1);
        }
    }

    function cleanTag($t) {
	$t = $t.replace(/ +(?= )/g,',');
        $t = $t.replace('-','.');
        $t = $t.replace(' ','.');
	return $t;
	}
    /**
     * Populates the upload form
     * @param xml
     */
	function populateForm(xml) {
		closePopup();
		
	    var $release_id = $(xml).find("release").attr("id");
	    var $release_title = $(xml).find("release").find("title:first").text();
	    var $artist = $(xml).find("artist-credit:first").find("name:first").text();
	    var $date = $(xml).find("release").find("date").text();
	    $year_release = $date.substring(0,4);
   	    var $country = $(xml).find("country").text();
        var $asin = $(xml).find("asin").text();
	    var $barcode = $(xml).find("barcode").text();
        $catalog_number = $(xml).find("catalog-number").text();
        $record_label = $(xml).find("label").find("sort-name").text();
        var $track_count = $(xml).find("track-list").attr("count");    
        var $track_titles = new Array();
        $(xml).find("track-list").find("title").each(function() {
            var $title = $(this).text();
            $track_titles.push($title);
        });
        
            clear();
	    $("#artist").val($artist);
	    $("#title").val($release_title);
	    $("#year").val($year_original);
	    $("#record_label").val($record_label);
	    $("#catalogue_number").val($catalog_number);
	    $("#tags").val($tags);
	    $("#releasetype").val(getReleaseType());
            var $amazon_link = "";
	    if($asin.length > 0) {
		$amazin_link = "[url=http://amazon.com/exec/obidos/ASIN/" + $asin + "]Amazon[/url]" + "\n";
            }
	    var $country_text = "";
 	    if($country.length > 0) {
                $country_text =  "Country: " + $country + "\n";
            }
	    var $barcode_text = "";
            if($barcode.length > 0) {
                $barcode_text =  "Barcode: " + $barcode + "\n";
            }
	    var $description = $amazon_link + 
	                       "[url=http://musicbrainz.org/release-group/" + $release_group_id + "]MusicBrainz[/url]" + "\n" + "\n" + 
			       $country_text +
			       $barcode_text +
	                       "Tracks: " + $track_count + "\n" + "\n" + 
	                       "Track List:" + "\n";
	                       for (var i=0; i < $track_titles.length; i++) {
						      $description = $description + "[#]" + $track_titles[i] + "\n";
					       };
	    $("#album_desc").val($description);
    }

    function populateEditionsForm() {
          $('#remaster_true').show();
	 $("#record_label").val("");
         $("#catalogue_number").val("");
	 $("#remaster_year").val($year_release);
         $("#remaster_record_label").val($record_label);
         $("#remaster_catalogue_number").val($catalog_number);
}

    function depopulateEditionsForm() {
	 $("#record_label").val($record_label);
         $("#catalogue_number").val($catalog_number);
         $("#remaster_year").val("");
         $("#remaster_record_label").val("");
         $("#remaster_catalogue_number").val("");
    }

    function closeEditionsForm() {
	 if($("#remaster").attr("checked")) {
                $('#remaster_true').hide();
        }
	
         $("#remaster").attr("checked", false);
	 $("#remaster_year").val("");
         $("#remaster_record_label").val("");
         $("#remaster_catalogue_number").val("");
	

    }
    /**
     * Gets the release type
     * @returns value of type
     */
    function getReleaseType() {
        var $value;
        switch($release_type) {
            case "Album":
               $value = 1;
               break;
            case "Soundtrack":
               $value = 3;
               break;   
            case "EP":
               $value = 5;
               break; 
            case "Compilation":
               $value = 7;
               break; 
            case "Single":
               $value = 9;
               break; 
            case "Live":
               $value = 11;
               break;     
            case "Remix":
               $value = 13;
               break;    
            case "Interview":
               $value = 15;
               break;    
            default:
               $value = "---";
               break;
        }
        return $value;
    }
    /**
	 * Enables the musicbrainz button only when the "Music" type is selected and a format isn't being uploaded
	 */
    function enableMusicBrainzButton() {
     if ($('#categories').is(':disabled') == false) { 
      $("#categories").click(function() {
        if($("#categories").val() != 0 ) {
             $("#musicbrainz_button").attr("disabled", "disabled");
          }
        else {
             $("#musicbrainz_button").removeAttr("disabled");      
        }
        });
     }
     else {
    	 $("#musicbrainz_button").attr("disabled", "disabled");
     }
    }
    /**
	 *Clears fields in the upload form
	 */
    function clear() {
	    closeEditionsForm();	  
  	    $("#artist").val("");
	    $("#title").val("");
	    $("#year").val("");
	    $("#record_label").val("");
	    $("#catalogue_number").val("");
	    $("#tags").val("");
	    $("#releasetype").val("");
	    $("#album_desc").val("");
	    $("#remaster_year").val("");
	    $("#remaster_record_label").val("");
	    $("#remaster_catalogue_number").val("");
}
    
 /**
  * Loads the popup
  * @returns
  */
 function openPopup(){
 	centerPopup();
 	if($popup_state==0){
 		$("#popup_background").css({
 			"opacity": "0.7"
 		});
 		$("#popup_background").fadeIn("fast");
 		$("#musicbrainz_popup").fadeIn("fast");
 		$popup_state = 1;
 	}
 }

 /**
  * Closes the popup
  * @returns
  */
 function closePopup(){
 	if($popup_state==1){
 		$("#popup_background").fadeOut("fast");
 		$("#musicbrainz_popup").fadeOut("fast");
		jQuery('#popup_back').html("");
 		$popup_state = 0;
	}
 }

 /**
  * Centers the popup on the screen
  * @returns
  */
 function centerPopup(){
	//TODO Center dynamically based on scroll position

 	var windowWidth = document.documentElement.clientWidth;
 	var windowHeight = document.documentElement.clientHeight;
 	var popupHeight = $("#musicbrainz_popup").height();
	var scrollPosition = window.pageYOffset;
	var percentage = (scrollPosition/windowHeight) * 100;
 	var popupWidth = $("#musicbrainz_popup").width();
 	$("#musicbrainz_popup").css({
 		"position": "absolute ! important",
		//"top": windowHeight/2-popupHeight/2,
 		"left": windowWidth/2-popupWidth/2 + "! important"
 	});

 	$("#popup_background").css({
 		"height": windowHeight
 	});
 }

 /**
  * Controls the popup state based on user input
  * @returns
  */
 function controlPopup() {
 	$("#popup_close").click(function(){
 		closePopup();
 	});

 	$(document).keypress(function(e){
 		if(e.keyCode==27 && $popup_state==1){
 			closePopup();
 		}
 	});
 }

 function loadCSS() {
   var $link = document.createElement('link')
   $link.href = 'static/styles/musicbrainz.css';
   $link.rel = 'stylesheet';
   $link.type = 'text/css';
   document.body.appendChild($link);
   $link = null; 
  }

} ) ( jQuery );