/**
 * This JS file is for examples list and actions linked to examples.
 */
class Examples {
    constructor(parent) {
        this.parent = parent;

        this.isExamplesDisplayed = false;

        // There's a "close" button on the mobile interface.
        document.getElementById("examplesButtonClose").addEventListener("click", this.hideExamples.bind(this));
        /**
         * Display / hide with the "examples" button. On any size interface
         */
        var examplesButton = document.getElementsByClassName("examplesButton");
        if (examplesButton.length > 0) {
            for (var i = 0; i < examplesButton.length; i++) {
                examplesButton[i].parentElement.onclick = function () {
                    if (!this.isExamplesDisplayed) this.displayExamples();
                    else this.hideExamples();
                }.bind(this);
            }
        }

        /**
         * The filter bar is used to search a thing on the examples.
         * This react on any input on the bar, or on a click on the search button.
         */
        var filterBar = document.getElementById("filterBar");
        if (filterBar) {
            var filterBarClear = document.getElementById("filterBarClear");
            var filter = function () {
                var filterText = filterBar.value.toLowerCase();
                if (filterText == "") filterBarClear.style.display = "none";
                else filterBarClear.style.display = "inline-block";

                var lines = document.getElementsByClassName("itemLine");
                for (var lineIndex = 0; lineIndex < lines.length; lineIndex++) {
                    var line = lines[lineIndex];
                    if (line.innerText.toLowerCase().indexOf(filterText) > -1) {
                        line.style.display = "";
                    } else {
                        line.style.display = "none";
                    }
                }

                var categories = document.getElementsByClassName("categoryContainer");
                var displayCount = categories.length;

                for (var categoryIndex = 0; categoryIndex < categories.length; categoryIndex++) {
                    var category = categories[categoryIndex];
                    category.style.display = "block";
                    if (category.clientHeight < 25) {
                        category.style.display = "none";
                        displayCount--;
                    }
                }

                if (displayCount == 0) document.getElementById("noResultsContainer").style.display = "block";
                else document.getElementById("noResultsContainer").style.display = "none";
            }
            filterBar.oninput = function () {
                filter();
            }
            filterBarClear.onclick = function () {
                filterBar.value = "";
                filter();
            }
        }
    }

    /**
     * Function to display the examples menu
     */
    displayExamples() {
        this.isExamplesDisplayed = true;
        document.getElementById("fpsLabel").style.display = "none";
        document.getElementById("exampleList").style.display = "block";
        document.getElementsByClassName("wrapper")[0].style.width = "calc(100% - 400px)";
        var menus = document.getElementsByClassName("toDisplay");
        for (var i = 0; i < menus.length; i++) {
            menus[i].style.display = "none";
        }
    };

    /**
     * Function to hide the examples menu
     */
    hideExamples() {
        this.isExamplesDisplayed = false;
        document.getElementById("fpsLabel").style.display = "block";
        document.getElementById("exampleList").style.display = "none";
        document.getElementsByClassName("wrapper")[0].style.width = "100%";
    };
}