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

        this.isExamplesDisplayed = false;

        this.fpsLabel = document.getElementById('fpsLabel');
        this.examplesButtons = document.getElementsByClassName('examplesButton');
        this.exampleList = document.getElementById('exampleList');

        /**
         * Display / hide with the "examples" button. On any size interface
         */
        if (this.examplesButtons.length > 0) {
            for (var i = 0; i < this.examplesButtons.length; i++) {
                this.examplesButtons[i].parentElement.onclick = function () {
                    if (!this.isExamplesDisplayed) this.displayExamples();
                    else this.hideExamples();
                }.bind(this);
            }
        }

        // There's a "close" button on the mobile interface.
        document.getElementById('examplesButtonClose').addEventListener('click', 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.parent.menuPG.removeAllOptions();

        var scripts = this.parent.main.scripts;

        if (!this.examplesLoaded) {

            
            function sortScriptsList(a, b) {
                if (a.title < b.title) return -1;
                else return 1;
            }

            for (var i = 0; i < scripts.length; i++) {
                scripts[i].samples.sort(sortScriptsList);

                var exampleCategory = document.createElement("div");
                exampleCategory.classList.add("categoryContainer");

                var exampleCategoryTitle = document.createElement("p");
                exampleCategoryTitle.innerText = scripts[i].title;
                exampleCategory.appendChild(exampleCategoryTitle);

                for (var ii = 0; ii < scripts[i].samples.length; ii++) {
                    var example = document.createElement("div");
                    example.classList.add("itemLine");
                    example.id = ii;

                    var exampleImg = document.createElement("img");
                    exampleImg.setAttribute("data-src", scripts[i].samples[ii].icon.replace("icons", "https://doc.babylonjs.com/examples/icons"));
                    exampleImg.setAttribute("onClick", "document.getElementById('PGLink_" + scripts[i].samples[ii].PGID + "').click();");

                    var exampleContent = document.createElement("div");
                    exampleContent.classList.add("itemContent");
                    exampleContent.setAttribute("onClick", "document.getElementById('PGLink_" + scripts[i].samples[ii].PGID + "').click();");

                    var exampleContentLink = document.createElement("div");
                    exampleContentLink.classList.add("itemContentLink");

                    var exampleTitle = document.createElement("h3");
                    exampleTitle.classList.add("exampleCategoryTitle");
                    exampleTitle.innerText = scripts[i].samples[ii].title;
                    var exampleDescr = document.createElement("div");
                    exampleDescr.classList.add("itemLineChild");
                    exampleDescr.innerText = scripts[i].samples[ii].description;

                    var exampleDocLink = document.createElement("a");
                    exampleDocLink.classList.add("itemLineDocLink");
                    exampleDocLink.innerText = "Documentation";
                    exampleDocLink.href = scripts[i].samples[ii].doc;
                    exampleDocLink.target = "_blank";

                    var examplePGLink = document.createElement("a");
                    examplePGLink.id = "PGLink_" + scripts[i].samples[ii].PGID;
                    examplePGLink.classList.add("itemLinePGLink");
                    examplePGLink.innerText = "Display";
                    examplePGLink.href = scripts[i].samples[ii].PGID;
                    examplePGLink.addEventListener("click", function () {
                        location.href = this.href;
                        location.reload();
                    });

                    exampleContentLink.appendChild(exampleTitle);
                    exampleContentLink.appendChild(exampleDescr);
                    exampleContent.appendChild(exampleContentLink);
                    exampleContent.appendChild(exampleDocLink);
                    exampleContent.appendChild(examplePGLink);

                    example.appendChild(exampleImg);
                    example.appendChild(exampleContent);

                    exampleCategory.appendChild(example);
                }

                exampleList.appendChild(exampleCategory);
            }
        }
        this.examplesLoaded = true;


        this.isExamplesDisplayed = true;
        this.exampleList.style.display = 'block';
        document.getElementsByClassName('wrapper')[0].style.width = 'calc(100% - 400px)';

        this.fpsLabel.style.display = 'none';
        this.toggleExamplesButtons.call(this, true);
        this.exampleList.querySelectorAll("img").forEach(function (img) {
            if (!img.src) {
                img.src = img.getAttribute("data-src");
            }
        })
    };

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

        if (this.parent.menuPG && this.parent.menuPG.isMobileVersion && document.getElementById('jsEditor').style.display == 'block') {} else this.fpsLabel.style.display = 'block';
        this.toggleExamplesButtons.call(this, false);
    };

    toggleExamplesButtons(selected) {
        if (this.examplesButtons.length > 0) {
            for (var i = 0; i < this.examplesButtons.length; i++) {
                if (selected)
                    this.examplesButtons[i].parentElement.classList.add("selected");
                else
                    this.examplesButtons[i].parentElement.classList.remove("selected");
            }
        }
    };
}