MusicBrainz: Set recording comments for a release 2011-12-27

// ==UserScript==
// @name           MusicBrainz: Set recording comments for a release
// @version        2011-12-27
// @author         Michael Wiencek
// @namespace      http://userscripts.org/users/266906
// @include        http://musicbrainz.org/release/*
// @include        http://test.musicbrainz.org/release/*
// @include        http://beta.musicbrainz.org/release/*
// ==/UserScript==

var scr = document.createElement("script");
scr.textContent = "(" + recording_comments + ")();";
document.body.appendChild(scr);

function recording_comments() {
    var $tracks = $("tr").filter(function() {return $(this).attr("typeof") == "mo:Track";});
    if ($tracks.length == 0)
        return;

    var MBID_REGEX = /[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}/,
        location = window.location.href;
    if (location.match(/\/edits$/) || location.match(/\/release\/add/))
        return;

    var release = location.match(MBID_REGEX)[0],
        editing = false, submitting = false;

    function RequestManager(rate) {
        this.queue = [];
        this.last = 0;

        this.next = function() {
            var request = this.queue.shift();
            if (request) {
                request();
                this.last = new Date().getTime();
                if (this.queue.length > 0) {
                    setTimeout(function(foo) {foo.next();}, rate, this);
                }
            }
        }

        this.push = function(req) {
            this.queue.push(req);
            if (this.queue.length == 1)
                this.start_queue();
        }

        this.unshift = function(req) {
            this.queue.unshift(req);
            if (this.queue.length == 1)
                this.start_queue();
        }

        this.start_queue = function() {
            var now = new Date().getTime();
            if (now - this.last >= rate) {
                this.next();
            } else {
                setTimeout(function(foo) {foo.next();},
                    rate - now + this.last, this);
            }
        }
    }

    function button(text) {
        return $("<button>" + text + "</button>")
            .css({"color": "#565656",
                  "background-color": "#F0F0F0",
                  "border": "1px solid #D0D0D0",
                  "border-top": "1px solid #EAEAEA",
                  "border-left": "1px solid #EAEAEA"});
    }

    $.each($tracks, function(i, track) {
        var $td = $($(track).children("td")[1]), node = $td.children(".mp")[0];
        if (node === undefined) {
            node = $td.children("a[rel=mo\\:publication_of]")[0];
        }
        $('<input type="text" class="recording-comment">')
            .insertAfter(node)
            .css({"background": "inherit", "border": "1px #999 solid", "width": "18em", "margin-left": "0.5em"})
            .hide();
    });

    var $inputs = $(".recording-comment")
        .bind("input.rc", function() {
            var comment = this.value, old = $(this).data("old");
            if (comment == old) {
                $(this).css("border-color", "#999");
            } else {
                $(this).css("border-color", "red");
            }
        });

    var $container = $("<div></div>")
        .css({"background": "#F1F1F1", "border": "1px #999 dotted", "display": "inline-block"})
        .insertBefore("table.tbl");

    var $edit_button = button("Edit recording comments")
        .bind("click", function() {
            if (editing) {
                $(this).text("Edit recording comments");
                $("#rc-table").hide();
                $inputs.hide();
            } else {
                $(this).text("Hide recording comments");
                $("#rc-table").show();
                $inputs.show();
            }
            editing = !editing;
        })
        .appendTo($container);

    $container.append('\
<table id="rc-table">\
<tr>\
<td><label for="all-comments">Set all comments to:</label></td>\
<td><input type="text" id="all-comments" style="width: 18em;"></td>\
</tr>\
<tr>\
<td><label for="rc-edit-note">Edit note:</label></td>\
<td><input type="text" id="rc-edit-note" style="width: 18em;"></td>\
</tr>\
<tr>\
<td></td><td></td>\
</tr>\
</table>');
    $("#rc-table").hide();

    var $all_comments = $("#all-comments")
        .bind("input", function() {
            $inputs.val($(this).val()).trigger("input.rc");
        });

    var edit_requests = new RequestManager(1000);

    var $submit_button = button("Submit changes (marked red)")
        .bind("click", function() {
            if (submitting) {
                edit_requests.queue = [];
                submitting = false;
                $(this).text("Submit changes (marked red)");
                $inputs.attr("disabled", false).trigger("input.rc");
                return;
            }
            submitting = true;
            $(this).text("Submitting...click to cancel!");
            $inputs.attr("disabled", true);
            var edit_count = 0;

            $.each($tracks, function(i, track) {
                var input = $inputs[i], comment = input.value;
                if (comment == $(input).data("old")) {
                    input.disabled = false;
                    return;
                }
                edit_count += 1;
                var link = $($(track).children("td")[1]).find("a[rel=mo\\:publication_of]")[0],
                    mbid = link.href.match(MBID_REGEX)[0];

                var request = function() {
                    $.get("/recording/" + mbid + "/edit", function(html, textStatus, jqXHR) {
                        if (jqXHR.status != 200) {
                            edit_requests.push(request);
                            return;
                        }

                        $(input).css("border-color", "blue");
                        var xml = $.parseXML(html.replace(/&nbsp;/g, "")), data = {};

                        data["edit-recording.name"] = xml.getElementById("id-edit-recording.name").value;
                        data["edit-recording.length"] = xml.getElementById("id-edit-recording.length").value;

                        for (var i = 0; true; i++) {
                            var a = [];
                            a[0] = "edit-recording.artist_credit.names." + i + ".artist.name";
                            a[1] = "edit-recording.artist_credit.names." + i + ".artist.id";
                            a[2] = "edit-recording.artist_credit.names." + i + ".name";
                            a[3] = "edit-recording.artist_credit.names." + i + ".join_phrase";
                            var artist_name = xml.getElementById("id-" + a[0]);
                            if (artist_name == null)
                                break;
                            data[a[0]] = artist_name.value;
                            data[a[1]] = xml.getElementById("id-" + a[1]).value;
                            data[a[2]] = xml.getElementById("id-" + a[2]).value;
                            data[a[3]] = xml.getElementById("id-" + a[3]).value;
                        }

                        data["edit-recording.edit_note"] = $("#rc-edit-note").val();
                        data["edit-recording.as_auto_editor"] = "1";
                        data["edit-recording.comment"] = comment;

                        var post_edit = function() {
                            $.post("/recording/" + mbid + "/edit", data,
                                function(data) {
                                    $(input)
                                        .data("old", comment)
                                        .trigger("input.rc")
                                        .attr("disabled", false);
                                    if (edit_requests.queue.length == 0)
                                        $submit_button.attr("disabled", false).text("Submit changes (marked red)");
                                }).error(function() {
                                    $(input)
                                        .css("border-color", "red")
                                        .attr("disabled", false);
                                    edit_requests.unshift(post_edit);
                                });
                        };
                        edit_requests.unshift(post_edit);

                    }).error(function() {
                        edit_requests.push(request);
                    });
                };
                edit_requests.push(request);
            });

            if (edit_count == 0)
                $(this).attr("disabled", false).text("Submit changes (marked red)");
        })
        .appendTo($container.find("td")[5]);

    $.get("/ws/2/release/" + release + "?inc=recordings", function(data) {
        var $recordings = $(data).find("recording");
        for (var i = 0; i < $recordings.length; i++) {
            var recording = $recordings[i], input = $inputs[i],
                disambiguation = $(recording).children("disambiguation")[0];
            if (disambiguation === undefined) {
                $(input).data("old", "");
                continue;
            }
            var comment = $(disambiguation).text();
            $(input).val(comment).data("old", comment);
        }
    });
}