using MvcExplorer.Models;
using System.Collections.Generic;
using System.Web.Mvc;

namespace MvcExplorer.Controllers
{
    public partial class FlexGridController : Controller
    {
        public ActionResult ColumnPicker(FormCollection collection)
        {
            var model = Sale.GetData(50);
            return View(model);
        }
    }
}

@model IEnumerable<Sale>

@section Styles{
    <style>
        .column-picker-icon {
            cursor: pointer;
        }

        .wj-multiselectlistbox.column-picker {
            box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
        }

        .wj-multiselectlistbox .wj-listbox-item > label {
            display: block;
            margin: 0 0 3px 0;
        }

        .wj-multiselectlistbox .wj-listbox-item.wj-state-selected {
            background: transparent;
            color: inherit;
        }

        .wj-multiselectlistbox .wj-listbox-item:hover {
            background: rgba(0,0,0,.05);
        }

        .wj-multiselectlistbox .drop-marker {
            position: absolute;
            background: #0085c7;
            opacity: 0.5;
            pointer-events: none;
            z-index: 1000;
        }
    </style>
}

@section Scripts{
    <script type="text/javascript">
        c1.documentReady(function () {
            // Create the Column-picker dropdown list
            var grid = wijmo.Control.getControl('#gridColumnPicker');
            let theColumnPicker = new wijmo.input.MultiSelectListBox('#theColumnPicker', {
                itemsSource: grid.columns,
                checkedMemberPath: 'visible',
                displayMemberPath: 'header',
                showFilterInput: true,
                showSelectAllCheckbox: true,
                lostFocus: function () { wijmo.hidePopup(theColumnPicker.hostElement) },
                checkedItemsChanged: function (sender) {
                    grid.columns.forEach(function (item) { item.visible = false; });
                    sender.checkedItems.forEach(function (item) {
                        grid.columns.getColumn(item.binding).visible = true;
                    });
                }
            });

            // Config drag & drop for the Column-picker
            configDragDropForColumnPicker(grid, theColumnPicker);

            // Prepare for column-picker button
            var tempBtnColPicker = document.getElementById('column-picker-icon');
            tempBtnColPicker._columnPicker = theColumnPicker;
            tempBtnColPicker._grid = grid;
        });

        function formatItem(panel, r, c, cell) {
            if (panel.cellType == wijmo.grid.CellType.TopLeft) {
                var tempBtnColPicker = document.getElementById('column-picker-icon'),
                    btnColPicker = tempBtnColPicker.cloneNode(true),
                    theColumnPicker = tempBtnColPicker._columnPicker,
                    grid = tempBtnColPicker._grid;

                // Show the column picker when the user clicks at the corner top-left cell
                btnColPicker.addEventListener("click", function (e) {
                    let host = theColumnPicker.hostElement;
                    if (host.offsetHeight) {
                        wijmo.hidePopup(host, true, true);
                        grid.focus();
                    }
                    else {
                        wijmo.showPopup(host, e.target, false, true, false);
                        theColumnPicker.focus();
                    }
                    e.preventDefault();
                });

                btnColPicker.addEventListener("mousedown", function (e) {
                    e.preventDefault();
                    e.stopPropagation();
                });

                cell.appendChild(btnColPicker);
                                
                if (theColumnPicker.hostElement.style.display != 'none') {
                    wijmo.showPopup(theColumnPicker.hostElement, btnColPicker, false, true, false);
                }
            }
        }

        // Config Column-picker's drag & drop
        function configDragDropForColumnPicker(theGrid, theColumnPicker) {
            var isDragEnabled = false,
                dragSrc = null,
                dragDst = null,
                theColumnPickerListBox = theColumnPicker.listBox,
                dragCheckbox = document.getElementById('enableDrag');

            dragCheckbox.addEventListener('click', function (e) {
                var element = e.target;
                isDragEnabled = element.checked;
                var host = theColumnPickerListBox.hostElement;
                var items = host.getElementsByClassName('wj-listbox-item');
                for (var i = 0; i < items.length; i++) {
                    enableDragItem(items[i], isDragEnabled);
                }
            });
            theColumnPickerListBox.formatItem.addHandler(function (s, e) {
                enableDragItem(e.item, isDragEnabled);
            });
            var theColumnPickerHost = theColumnPickerListBox.hostElement;
            theColumnPickerHost.addEventListener('dragstart', handleDragStart);
            theColumnPickerHost.addEventListener('dragover', handleDragOver);
            theColumnPickerHost.addEventListener('drop', handleDrop);
            theColumnPickerHost.addEventListener('dragend', handleDragEnd);
            function enableDragItem(item, enabled) {
                item.setAttribute('draggable', enabled);
            }
            function handleDragStart(e) {
                dragSrc = wijmo.closest(e.target, '.wj-listbox-item');
                if (dragSrc) {
                    e.dataTransfer.setData('text', dragSrc.innerHTML);
                    e.dataTransfer.effectAllowed = 'move';
                }
            }
            function handleDragOver(e) {
                // C1WEB-28851: Fix getting wrong target in IE
                var target = document.elementFromPoint(e.clientX, e.clientY),
                    dragOver = wijmo.closest(target, '.wj-listbox-item');
                if (dragDst && dragDst !== dragOver) {
                    removeDropMarker();
                }
                if (dragOver && dragOver !== dragSrc) {
                    e.preventDefault();
                    e.dataTransfer.dropEffect = 'move';
                    dragDst = dragOver;
                    var src = getElementIndex(dragSrc);
                    var dst = getElementIndex(dragDst);
                    removeDropMarker();
                    addDropMarker(dst > src);
                }
                else {
                    dragDst = null;
                }
            }
            function handleDrop(e) {
                if (dragSrc && dragDst) {
                    e.preventDefault();
                    var src = theGrid.getColumn(dragSrc.innerText.trim()).index,
                        dst = theGrid.getColumn(dragDst.innerText.trim()).index;
                    theGrid.columns.moveElement(src, dst);
                }
                handleDragEnd();
            }
            function handleDragEnd() {
                dragSrc = null;
                dragDst = null;
                removeDropMarker();
            }
            function getElementIndex(element) {
                var parent = element.parentElement;
                var siblings = Array.prototype.slice.call(parent.children);
                return siblings.indexOf(element);
            }
            function removeDropMarker() {
                wijmo.removeChild(wijmo.getElement('.drop-marker'));
            }
            function addDropMarker(isAfterPos) {
                const height = 4;
                const margin = 2;
                var width = dragDst.clientWidth - margin;
                var leftPos = margin;
                var topPos = isAfterPos
                    ? (dragDst.offsetTop + dragDst.clientHeight - height)
                    : (dragDst.offsetTop);
                // C1WEB-28851: IE does not recornize the code, hence change to this
                var html = '<div class="drop-marker" style="top:' + topPos + 'px;left:' + leftPos + 'px;height:' + height + 'px;width:' + width + 'px"></div>';
                wijmo.createElement(html, theColumnPicker.hostElement);
            }
        }

        // Save columns' layout to localStorage
        function saveLayout() {
            var grid = wijmo.Control.getControl("#gridColumnPicker");
            localStorage['columns'] = grid.columnLayout;
        }
        // Restore columns' layout from localStorage
        function loadLayout() {
            var grid = wijmo.Control.getControl("#gridColumnPicker"),
                columnLayout = localStorage['columns'];
            if (columnLayout) {
                grid.columnLayout = columnLayout;
            }
        }
    </script>
}

@(Html.C1().FlexGrid<Sale>()
            .Id("gridColumnPicker")
            .AutoGenerateColumns(true)
            .CssClass("grid")
            .IsReadOnly(true)
            .Bind(Model)
            .ItemFormatter("formatItem")
)

<div class="checkbox">
    <label>
        <input id="enableDrag" type="checkbox"> @Html.Raw(Resources.FlexGrid.ColumnPicker_Text2)
    </label>
</div>
<div style="display:none">
    <img id="column-picker-icon" class="column-picker-icon" src="~/Content/images/icons/Columns.png" width="20" height="20" />
    <div id="theColumnPicker" class="column-picker" style="display:none"></div>
</div>

<input type="button" value="@(Resources.FlexGrid.ColumnPicker_Text4)" class="btn" onclick="saveLayout()" />
<input type="button" value="@(Resources.FlexGrid.ColumnPicker_Text5)" class="btn" onclick="loadLayout()" />

@section Summary{
    <p>@Html.Raw(Resources.FlexGrid.ColumnPicker_Text0)</p>
}

@section Description{
    <p>@Html.Raw(Resources.FlexGrid.ColumnPicker_Text0)</p>
    <p>@Html.Raw(Resources.FlexGrid.ColumnPicker_Text1)</p>
    <p>@Html.Raw(Resources.FlexGrid.ColumnPicker_Text3)</p>
}