window.onload = function () {

    /**
     * Retrieve an element up in the tree from its class name.
     */
    function getParentByClass(el, className) {
        var p = el.parentNode;
        if (p == null || p.classList.contains(className)) {
            return p;
        }
        return getParentByClass(p, className);
    }


    /**
     * Handle responsive menu.
     * Source: http://purecss.io/layouts/tucked-menu-vertical/
     */
    (function (window, document) {
        var menu = document.getElementById('shaarli-menu'),
            WINDOW_CHANGE_EVENT = ('onorientationchange' in window) ? 'orientationchange':'resize';

        function toggleHorizontal() {
            [].forEach.call(
                document.getElementById('shaarli-menu').querySelectorAll('.menu-transform'),
                function(el){
                    el.classList.toggle('pure-menu-horizontal');
                }
            );
        };

        function toggleMenu() {
            // set timeout so that the panel has a chance to roll up
            // before the menu switches states
            if (menu.classList.contains('open')) {
                setTimeout(toggleHorizontal, 500);
            }
            else {
                toggleHorizontal();
            }
            menu.classList.toggle('open');
            document.getElementById('menu-toggle').classList.toggle('x');
        };

        function closeMenu() {
            if (menu.classList.contains('open')) {
                toggleMenu();
            }
        }

        document.getElementById('menu-toggle').addEventListener('click', function (e) {
            toggleMenu();
        });

        window.addEventListener(WINDOW_CHANGE_EVENT, closeMenu);
    })(this, this.document);

    /**
     * Fold/Expand shaares description and thumbnail.
     */
    var foldAllButtons = document.getElementsByClassName('fold-all');
    var foldButtons = document.getElementsByClassName('fold-button');

    [].forEach.call(foldButtons, function (foldButton) {
        // Retrieve description
        var description = null;
        var thumbnail = null;
        var linklistItem = getParentByClass(foldButton, 'linklist-item');
        if (linklistItem != null) {
            description = linklistItem.querySelector('.linklist-item-description');
            thumbnail = linklistItem.querySelector('.linklist-item-thumbnail');
            if (description != null || thumbnail != null) {
                foldButton.style.display = 'inline';
            }
        }

        foldButton.addEventListener('click', function (event) {
            event.preventDefault();
            toggleFold(event.target, description, thumbnail);
        });
    });

    if (foldAllButtons != null) {
        [].forEach.call(foldAllButtons, function (foldAllButton) {
            foldAllButton.addEventListener('click', function (event) {
                event.preventDefault();
                var state = foldAllButton.firstElementChild.getAttribute('class').indexOf('down') != -1 ? 'down' : 'up';
                [].forEach.call(foldButtons, function (foldButton) {
                    if (foldButton.firstElementChild.classList.contains('fa-chevron-up') && state == 'down'
                        || foldButton.firstElementChild.classList.contains('fa-chevron-down') && state == 'up'
                    ) {
                        return;
                    }
                    // Retrieve description
                    var description = null;
                    var thumbnail = null;
                    var linklistItem = getParentByClass(foldButton, 'linklist-item');
                    if (linklistItem != null) {
                        description = linklistItem.querySelector('.linklist-item-description');
                        thumbnail = linklistItem.querySelector('.linklist-item-thumbnail');
                        if (description != null || thumbnail != null) {
                            foldButton.style.display = 'inline';
                        }
                    }

                    toggleFold(foldButton.firstElementChild, description, thumbnail);
                });
                foldAllButton.firstElementChild.classList.toggle('fa-chevron-down');
                foldAllButton.firstElementChild.classList.toggle('fa-chevron-up');
            });
        });
    }

    function toggleFold(button, description, thumb)
    {
        // Switch fold/expand - up = fold
        if (button.classList.contains('fa-chevron-up')) {
            button.title = 'Expand';
            if (description != null) {
                description.style.display = 'none';
            }
            if (thumb != null) {
                thumb.style.display = 'none';
            }
        }
        else {
            button.title = 'Fold';
            if (description != null) {
                description.style.display = 'block';
            }
            if (thumb != null) {
                thumb.style.display = 'block';
            }
        }
        button.classList.toggle('fa-chevron-down');
        button.classList.toggle('fa-chevron-up');
    }

    /**
     * Confirmation message before deletion.
     */
    var deleteLinks = document.querySelectorAll('.confirm-delete');
    [].forEach.call(deleteLinks, function(deleteLink) {
        deleteLink.addEventListener('click', function(event) {
            if(! confirm('Are you sure you want to delete this link ?')) {
                event.preventDefault();
            }
        });
    });

    /**
     * Close alerts
     */
    var closeLinks = document.querySelectorAll('.pure-alert-close');
    [].forEach.call(closeLinks, function(closeLink) {
        closeLink.addEventListener('click', function(event) {
            var alert = getParentByClass(event.target, 'pure-alert-closable');
            alert.style.display = 'none';
        });
    });

    /**
     * New version dismiss.
     * Hide the message for one week using localStorage.
     */
    var newVersionDismiss = document.getElementById('new-version-dismiss');
    var newVersionMessage = document.querySelector('.new-version-message');
    if (newVersionMessage != null
        && localStorage.getItem('newVersionDismiss') != null
        && parseInt(localStorage.getItem('newVersionDismiss')) + 7*24*60*60*1000 > (new Date()).getTime()
    ) {
        newVersionMessage.style.display = 'none';
    }
    if (newVersionDismiss != null) {
        newVersionDismiss.addEventListener('click', function () {
            localStorage.setItem('newVersionDismiss', (new Date()).getTime());
        });
    }

    var hiddenReturnurl = document.getElementsByName('returnurl');
    if (hiddenReturnurl != null) {
        hiddenReturnurl.value = window.location.href;
    }

    /**
     * Autofocus text fields
     */
    var autofocusElements = document.querySelector('.autofocus');
    if (autofocusElements != null) {
        autofocusElements.focus();
    }

    /**
     * Handle sub menus/forms
     */
    var openers = document.getElementsByClassName('subheader-opener');
    if (openers != null) {
        [].forEach.call(openers, function(opener) {
             opener.addEventListener('click', function(event) {
                 event.preventDefault();

                 var id = opener.getAttribute('data-open-id');
                 var sub = document.getElementById(id);

                 if (sub != null) {
                    [].forEach.call(document.getElementsByClassName('subheader-form'), function (element) {
                        if (element != sub) {
                            removeClass(element, 'open')
                        }
                     });

                     sub.classList.toggle('open');
                 }
             });
        });
    }

    function removeClass(element, classname) {
        element.className = element.className.replace(new RegExp('(?:^|\\s)'+ classname + '(?:\\s|$)'), ' ');
    }

    /**
     * Remove CSS target padding (for fixed bar)
     */
    if (location.hash != '') {
        var anchor = document.querySelector(location.hash);
        if (anchor != null) {
            var padsize = anchor.clientHeight;
            console.log(document.querySelector(location.hash).clientHeight);
            this.window.scroll(0, this.window.scrollY - padsize);
            anchor.style.paddingTop = 0;
        }
    }

    /**
     * Text area resizer
     */
    var description = document.getElementById('lf_description');
    var observe = function (element, event, handler) {
        element.addEventListener(event, handler, false);
    };
    function init () {
        function resize () {
            description.style.height = 'auto';
            description.style.height = description.scrollHeight+10+'px';
        }
        /* 0-timeout to get the already changed text */
        function delayedResize () {
            window.setTimeout(resize, 0);
        }
        observe(description, 'change',  resize);
        observe(description, 'cut',     delayedResize);
        observe(description, 'paste',   delayedResize);
        observe(description, 'drop',    delayedResize);
        observe(description, 'keydown', delayedResize);

        resize();
    }

    if (description != null) {
        init();
        // Submit editlink form with CTRL + Enter in the text area.
        description.addEventListener('keydown', function (event) {
            if (event.ctrlKey && event.keyCode === 13) {
                document.getElementById('button-save-edit').click();
            }
        });
    }
};