/*
 * By LaStudio Team
 */
( function( $ ) {

    "use strict";
    $.fn.la_sticky = function (opts) {
        var doc_height, elm, enable_bottoming, inner_scrolling, manual_spacer, offset_top, outer_width, parent_selector, recalc_every, sticky_class, win_height, _fn, _i, _len, fake_parent, fake_parent_height;
        if (opts == null) {
            opts = {};
        }
        sticky_class = opts.sticky_class, inner_scrolling = opts.inner_scrolling, recalc_every = opts.recalc_every, parent_selector = opts.parent, offset_top = opts.offset_top, manual_spacer = opts.spacer, enable_bottoming = opts.bottoming, fake_parent = opts.fake_parent, fake_parent_height = opts.fake_parent_height;
        win_height = $(window).height();
        doc_height = $(document).height();
        if (offset_top == null) {
            offset_top = 0;
        }
        if (parent_selector == null) {
            parent_selector = void 0;
        }
        if (inner_scrolling == null) {
            inner_scrolling = true;
        }
        if (sticky_class == null) {
            sticky_class = "is_stuck";
        }
        if (enable_bottoming == null) {
            enable_bottoming = true;
        }

        outer_width = function(el) {
            var computed, w, _el;
            if (window.getComputedStyle) {
                _el = el[0];
                computed = window.getComputedStyle(el[0]);
                w = parseFloat(computed.getPropertyValue("width")) + parseFloat(computed.getPropertyValue("margin-left")) + parseFloat(computed.getPropertyValue("margin-right"));
                if (computed.getPropertyValue("box-sizing") !== "border-box") {
                    w += parseFloat(computed.getPropertyValue("border-left-width")) + parseFloat(computed.getPropertyValue("border-right-width")) + parseFloat(computed.getPropertyValue("padding-left")) + parseFloat(computed.getPropertyValue("padding-right"));
                }
                return w;
            } else {
                return el.outerWidth(true);
            }
        };
        _fn = function(elm, padding_bottom, parent_top, parent_height, top, height, el_float, detached) {
            var bottomed, detach, fixed, last_pos, last_scroll_height, offset, parent, recalc, recalc_and_tick, recalc_counter, spacer, tick;
            var _fake_parent;
            if (elm.data("la_sticky")) {
                return;
            }

            elm.data("la_sticky", true);

            last_scroll_height = doc_height;
            parent = elm.parent();
            if(fake_parent){
                _fake_parent = fake_parent;
            }
            if (parent_selector != null) {
                parent = parent.closest(parent_selector);
            }
            if (!parent.length) {
                throw "failed to find stick parent";
            }
            fixed = false;
            bottomed = false;
            spacer = manual_spacer != null ? manual_spacer && elm.closest(manual_spacer) : $("<div />");
            if (spacer) {
                spacer.css('position', elm.css('position'));
            }
            recalc = function() {
                var border_top, padding_top, restore;
                if (detached) {
                    return;
                }
                win_height = $(window).height();
                doc_height = $(document).height();
                last_scroll_height = doc_height;
                border_top = parseInt(parent.css("border-top-width"), 10);
                padding_top = parseInt(parent.css("padding-top"), 10);
                padding_bottom = parseInt(parent.css("padding-bottom"), 10);
                parent_top = parent.offset().top + border_top + padding_top;
                parent_height = fake_parent ? _fake_parent.height() : parent.height();
                if (fixed) {
                    fixed = false;
                    bottomed = false;
                    if (manual_spacer == null) {
                        elm.insertAfter(spacer);
                        spacer.detach();
                    }
                    elm.css({
                        position: "",
                        top: "",
                        width: "",
                        bottom: ""
                    }).removeClass(sticky_class);
                    restore = true;
                }
                top = elm.offset().top - (parseInt(elm.css("margin-top"), 10) || 0) - offset_top;
                height = elm.outerHeight(true);
                el_float = elm.css("float");
                if (spacer) {
                    spacer.css({
                        width: outer_width(elm),
                        height: height,
                        display: elm.css("display"),
                        "vertical-align": elm.css("vertical-align"),
                        "pointer-events": "none",
                        "float": el_float
                    });
                }
                if (restore) {
                    return tick();
                }
            };
            recalc();
            if (height === parent_height) {
                return;
            }
            last_pos = void 0;
            offset = offset_top;
            recalc_counter = recalc_every;
            tick = function() {
                var css, delta, recalced, scroll, will_bottom;
                if (detached) {
                    return;
                }
                recalced = false;
                if (recalc_counter != null) {
                    recalc_counter -= 1;
                    if (recalc_counter <= 0) {
                        recalc_counter = recalc_every;
                        recalc();
                        recalced = true;
                    }
                }
                if (!recalced && doc_height !== last_scroll_height) {
                    recalc();
                    recalced = true;
                }
                scroll = $(window).scrollTop();
                if (last_pos != null) {
                    delta = scroll - last_pos;
                }
                last_pos = scroll;
                if (fixed) {
                    if (enable_bottoming) {
                        will_bottom = scroll + height + offset > parent_height + parent_top;
                        if (bottomed && !will_bottom) {
                            bottomed = false;
                            elm.css({
                                position: "fixed",
                                bottom: "",
                                top: offset
                            }).trigger("la_sticky:unbottom");
                        }
                    }
                    if (scroll <= top) {
                        fixed = false;
                        offset = offset_top;
                        if (manual_spacer == null) {
                            if (el_float === "left" || el_float === "right") {
                                elm.insertAfter(spacer);
                            }
                            spacer.detach();
                        }
                        css = {
                            position: "",
                            width: "",
                            top: ""
                        };
                        elm.css(css).removeClass(sticky_class).trigger("la_sticky:unstick");
                    }
                    if (inner_scrolling) {
                        if (height + offset_top > win_height) {
                            if (!bottomed) {
                                offset -= delta;
                                offset = Math.max(win_height - height, offset);
                                offset = Math.min(offset_top, offset);
                                if (fixed) {
                                    elm.css({
                                        top: offset + "px"
                                    });
                                }
                            }
                        }
                    }
                } else {
                    if (scroll > top) {
                        fixed = true;
                        css = {
                            position: "fixed",
                            top: offset
                        };
                        css.width = elm.css("box-sizing") === "border-box" ? elm.outerWidth() + "px" : elm.width() + "px";
                        elm.css(css).addClass(sticky_class);
                        if (manual_spacer == null) {
                            elm.after(spacer);
                            if (el_float === "left" || el_float === "right") {
                                spacer.append(elm);
                            }
                        }
                        elm.trigger("la_sticky:stick");
                    }
                }
                if (fixed && enable_bottoming) {
                    if (will_bottom == null) {
                        will_bottom = scroll + height + offset > parent_height + parent_top;
                    }
                    if (!bottomed && will_bottom) {
                        bottomed = true;
                        if (parent.css("position") === "static") {
                            parent.css({
                                position: "relative"
                            });
                        }
                        return elm.css({
                            position: "absolute",
                            bottom: padding_bottom,
                            top: "auto"
                        }).trigger("la_sticky:bottom");
                    }
                }
            };
            recalc_and_tick = function() {
                recalc();
                return tick();
            };
            detach = function() {
                detached = true;
                $(window).off("touchmove", tick);
                $(window).off("scroll", tick);
                $(window).off("resize", recalc_and_tick);
                $(document.body).off("la_sticky:recalc", recalc_and_tick);
                elm.off("la_sticky:detach", detach);
                elm.removeData("la_sticky");
                elm.css({
                    position: "",
                    bottom: "",
                    top: "",
                    width: ""
                });
                parent.position("position", "");
                if (fixed) {
                    if (manual_spacer == null) {
                        if (el_float === "left" || el_float === "right") {
                            elm.insertAfter(spacer);
                        }
                        spacer.remove();
                    }
                    return elm.removeClass(sticky_class);
                }
            };
            $(window).on("touchmove", tick);
            $(window).on("scroll", tick);
            $(window).on("resize", recalc_and_tick);
            $(document.body).on("la_sticky:recalc", recalc_and_tick);
            elm.on("la_sticky:detach", detach);
            return setTimeout(tick, 0);
        };
        for (_i = 0, _len = this.length; _i < _len; _i++) {
            elm = this[_i];
            _fn($(elm));
        }
        return this;
    }

} )( jQuery );