/* global $, calibre, EPUBJS, ePubReader */

var reader;

(function() {
    "use strict";

    EPUBJS.filePath = calibre.filePath;
    EPUBJS.cssPath = calibre.cssPath;

    reader = ePubReader(calibre.bookUrl, {
        restore: true,
        bookmarks: calibre.bookmark ? [calibre.bookmark] : []
    });

    if (calibre.useBookmarks) {
        reader.on("reader:bookmarked", updateBookmark.bind(reader, "add"));
        reader.on("reader:unbookmarked", updateBookmark.bind(reader, "remove"));
    } else {
        $("#bookmark, #show-Bookmarks").remove();
    }

    /**
     * @param {string} action - Add or remove bookmark
     * @param {string|int} location - Location or zero
     */
    function updateBookmark(action, location) {
        // Remove other bookmarks (there can only be one)
        if (action === "add") {
            this.settings.bookmarks.filter(function (bookmark) {
                return bookmark && bookmark !== location;
            }).map(function (bookmark) {
                this.removeBookmark(bookmark);
            }.bind(this));
        }

        // Save to database
        $.ajax(calibre.bookmarkUrl, {
            method: "post",
            data: { bookmark: location || "" }
        }).fail(function (xhr, status, error) {
            alert(error);
        });
    }
})();