Rakka.editPage = function (baseURI, pageName) {
    var $body = $("div.body");

    $body.text("Loading... please wait.");
    
    // XML 版のページを取得する。
    $.ajax({
        url    : baseURI + pageName + ".xml",
        success: function (pageXml) {
                     var $page         = $(pageXml).find("page");
                     var oldRevision   = $page.attr("revision");
                     var defaultAction = $page.attr("isBinary") == "yes"          ? "uploadFile"
                                       : $page.attr("type")     == "text/x-rakka" ? "editAsWiki"
                                       : $page.attr("type")     == "text/css"     ? "editAsCSS"
                                       :                                            "unknown"
                                       ;
                     var source        = $page.find("source").text();
                     Rakka.displayPageEditor($body, pageName, oldRevision, defaultAction, source);
                 },
        error  : function (req) {
                     if (req.status == 404) {
                         Rakka.displayPageEditor($body, pageName, null, "editAsWiki");
                     }
                     else {
                         $body.text("Error: " + req.status + " " + req.statusText);
                     }
                 }
        });
};

Rakka.displayPageEditor = function ($place, pageName, oldRevision, defaultAction, source) {
    $place.empty();

    var fldPageName
      = $.INPUT({type : "text", value: pageName});

    var btnEditAsWiki
      = $.INPUT({type   : "radio",
                 name   : "action",
                 checked: (defaultAction == "editAsWiki" ? "checked" : "")});

    var btnEditAsCSS
      = $.INPUT({type   : "radio",
                 name   : "action",
                 checked: (defaultAction == "editAsCSS"  ? "checked" : "")});

    var btnUploadFile
      = $.INPUT({type   : "radio",
                 name   : "action",
                 checked: (defaultAction == "uploadFile" ? "checked" : "")});

    var btnDelete
      = $.INPUT({type   : "radio",
                 name   : "action",
                 checked: ""});

    var pageEditor
      = $.TABLE({className: "pageEditor"},
          $.TBODY({},
            $.TR({},
              $.TH({}, "Name of the page"),
              $.TD({}, fldPageName)
            ),
            $.TR({},
              $.TH({}, "Action"),
              $.TD({},
                $.UL({},
                  $.LI({},
                    $.LABEL({},
                      btnEditAsWiki,
                      "Edit as a Wiki page"
                    )
                  ),
                  $.LI({},
                    $.LABEL({},
                      btnEditAsCSS,
                      "Edit as a style sheet"
                    )
                  ),
                  $.LI({},
                    $.LABEL({},
                      btnUploadFile,
                      "Upload a file"
                    )
                  ),
                  (oldRevision != "" && oldRevision != 0
                     ? $.LI({},
                         $.LABEL({},
                           btnDelete,
                           "Delete this page"
                         )
                       )
                     : [])
                )
              )
            )
          )
        );

    $place.append(pageEditor);
};