(function () {

    var checkInterval = null;

    // Setup the board
    function board_load_events()
    {
        // Drag and drop
        $(".column").sortable({
            connectWith: ".column",
            placeholder: "draggable-placeholder",
            stop: function(event, ui) {
                board_save();
            }
        });

        // Open assignee popover
        $(".task-board-user a").click(function(e) {

            e.preventDefault();
            e.stopPropagation();

            var taskId = $(this).parent().parent().attr("data-task-id");

            $.get("?controller=board&action=assign&task_id=" + taskId, function(data) {
                popover_show(data);
            });
        });

        // Redirect to the task details page
        $("[data-task-id]").each(function() {
            $(this).click(function() {
                window.location = "?controller=task&action=show&task_id=" + $(this).attr("data-task-id");
            });
        });

        // Automatic refresh
        var interval = parseInt($("#board").attr("data-check-interval"));

        if (interval > 0) {
            checkInterval = window.setInterval(board_check, interval * 1000);
        }
    }

    // Stop events
    function board_unload_events()
    {
        $("[data-task-id]").off();
        clearInterval(checkInterval);
    }

    // Save and refresh the board
    function board_save()
    {
        var data = [];
        var $boardSelector = $("#board");
        var projectId = $boardSelector.attr("data-project-id");

        board_unload_events();

        $(".column").each(function() {
            var columnId = $(this).attr("data-column-id");

            $("#column-" + columnId + " .task-board").each(function(index) {
                data.push({
                    "task_id": parseInt($(this).attr("data-task-id")),
                    "position": index + 1,
                    "column_id": parseInt(columnId)
                });
            });
        });

        $.ajax({
            cache: false,
            url: "?controller=board&action=save&project_id=" + projectId,
            data: {"positions": data, "csrf_token": $boardSelector.attr("data-csrf-token")},
            type: "POST",
            success: function(data) {
                $("#board").remove();
                $("#main").append(data);
                board_load_events();
                filter_apply();
            }
        });
    }

    // Check if a board have been changed by someone else
    function board_check()
    {
        var $boardSelector = $("#board");
        var projectId = $boardSelector.attr("data-project-id");
        var timestamp = $boardSelector.attr("data-time");

        if (is_visible() && projectId != undefined && timestamp != undefined) {
            $.ajax({
                cache: false,
                url: "?controller=board&action=check&project_id=" + projectId + "&timestamp=" + timestamp,
                statusCode: {
                    200: function(data) {
                        $boardSelector.remove();
                        $("#main").append(data);
                        board_unload_events();
                        board_load_events();
                        filter_apply();
                    }
                }
            });
        }
    }

    // Apply user or date filter (change tasks opacity)
    function filter_apply()
    {
        var selectedUserId = $("#form-user_id").val();
        var selectedCategoryId = $("#form-category_id").val();
        var filterDueDate = $("#filter-due-date").hasClass("filter-on");

        $("[data-task-id]").each(function(index, item) {

            var ownerId = item.getAttribute("data-owner-id");
            var dueDate = item.getAttribute("data-due-date");
            var categoryId = item.getAttribute("data-category-id");

            if (ownerId != selectedUserId && selectedUserId != -1) {
                item.style.opacity = "0.2";
            }
            else {
                item.style.opacity = "1.0";
            }

            if (filterDueDate && (dueDate == "" || dueDate == "0")) {
                item.style.opacity = "0.2";
            }

            if (categoryId != selectedCategoryId && selectedCategoryId != -1) {
                item.style.opacity = "0.2";
            }
        });
    }

    // Load filter events
    function filter_load_events()
    {
        $("#form-user_id").change(filter_apply);

        $("#form-category_id").change(filter_apply);

        $("#filter-due-date").click(function(e) {
            $(this).toggleClass("filter-on");
            filter_apply();
            e.preventDefault();
        });
    }

    // Show popup
    function popover_show(content)
    {
        $("body").append('<div id="popover-container"><div id="popover-content">' + content + '</div></div>');

        $("#popover-container").click(function() {
            $(this).remove();
        });

        $("#popover-content").click(function(e) {
            e.stopPropagation();
        });
    }

    // Return true if the page is visible
    function is_visible()
    {
        var property = "";

        if (typeof document.hidden !== "undefined") {
            property = "visibilityState";
        } else if (typeof document.mozHidden !== "undefined") {
            property = "mozVisibilityState";
        } else if (typeof document.msHidden !== "undefined") {
            property = "msVisibilityState";
        } else if (typeof document.webkitHidden !== "undefined") {
            property = "webkitVisibilityState";
        }

        if (property != "") {
            return document[property] == "visible";
        }

        return true;
    }

    // Initialization
    $(function() {
        board_load_events();
        filter_load_events();

        $("#form-board-selector").change(function() {
            window.location = "?controller=board&action=show&project_id=" + $(this).val();
        });
    });

}());