/**
 * DevExtreme (ui/list/ui.list.edit.strategy.grouped.js)
 * Version: 16.2.6
 * Build date: Tue Mar 28 2017
 *
 * Copyright (c) 2012 - 2017 Developer Express Inc. ALL RIGHTS RESERVED
 * EULA: https://www.devexpress.com/Support/EULAs/DevExtreme.xml
 */
"use strict";
var $ = require("jquery"),
    EditStrategy = require("../collection/ui.collection_widget.edit.strategy.plain");
var LIST_ITEM_CLASS = "dx-list-item",
    LIST_GROUP_CLASS = "dx-list-group";
var SELECTION_SHIFT = 20,
    SELECTION_MASK = 2303;
var combineIndex = function(indices) {
    return (indices.group << SELECTION_SHIFT) + indices.item
};
var splitIndex = function(combinedIndex) {
    return {
        group: combinedIndex >> SELECTION_SHIFT,
        item: combinedIndex & SELECTION_MASK
    }
};
var GroupedEditStrategy = EditStrategy.inherit({
    _groupElements: function() {
        return this._collectionWidget._itemContainer().find("." + LIST_GROUP_CLASS)
    },
    _groupItemElements: function($group) {
        return $group.find("." + LIST_ITEM_CLASS)
    },
    getIndexByItemData: function(itemData) {
        var groups = this._collectionWidget.option("items"),
            index = false;
        if (!itemData) {
            return false
        }
        if (itemData.items && itemData.items.length) {
            itemData = itemData.items[0]
        }
        $.each(groups, function(groupIndex, group) {
            if (!group.items) {
                return false
            }
            $.each(group.items, function(itemIndex, item) {
                if (item !== itemData) {
                    return true
                }
                index = {
                    group: groupIndex,
                    item: itemIndex
                };
                return false
            });
            if (index) {
                return false
            }
        });
        return index
    },
    getItemDataByIndex: function(index) {
        var items = this._collectionWidget.option("items");
        return index && items[index.group] && items[index.group].items[index.item] || null
    },
    itemsGetter: function() {
        var resultItems = [],
            items = this._collectionWidget.option("items");
        for (var i = 0; i < items.length; i++) {
            if (items[i] && items[i].items) {
                resultItems = resultItems.concat(items[i].items)
            } else {
                resultItems.push(items[i])
            }
        }
        return resultItems
    },
    deleteItemAtIndex: function(index) {
        var indices = splitIndex(index),
            itemGroup = this._collectionWidget.option("items")[indices.group].items;
        itemGroup.splice(indices.item, 1)
    },
    getKeysByItems: function(items) {
        var plainItems = [];
        for (var i = 0; i < items.length; i++) {
            if (items[i] && items[i].items) {
                plainItems = plainItems.concat(items[i].items)
            } else {
                plainItems.push(items[i])
            }
        }
        var result = [];
        for (i = 0; i < plainItems.length; i++) {
            result.push(this._collectionWidget.keyOf(plainItems[i]))
        }
        return result
    },
    getIndexByKey: function(key, items) {
        var groups = items || this._collectionWidget.option("items"),
            index = -1,
            that = this;
        $.each(groups, function(groupIndex, group) {
            if (!group.items) {
                return
            }
            var keys = that.getKeysByItems(group.items);
            $.each(keys, function(keyIndex, itemKey) {
                if (that._equalKeys(itemKey, key)) {
                    index = {
                        group: groupIndex,
                        item: keyIndex
                    };
                    return false
                }
            });
            if (index !== -1) {
                return false
            }
        });
        return index
    },
    getItemsByKeys: function(keys) {
        var result = [];
        $.each(keys, function(_, key) {
            var getItemMeta = function(groups) {
                var index = this.getIndexByKey(key, groups);
                var group = index && groups[index.group];
                if (!group) {
                    return
                }
                return {
                    groupKey: group.key,
                    item: group.items[index.item]
                }
            }.bind(this);
            var itemMeta = getItemMeta(this._collectionWidget.option("items")) || getItemMeta(this._collectionWidget.option("selectedItems"));
            var groupKey = itemMeta.groupKey;
            var item = itemMeta.item;
            var selectedGroup;
            $.each(result, function(_, item) {
                if (item.key === groupKey) {
                    selectedGroup = item;
                    return false
                }
            });
            if (!selectedGroup) {
                selectedGroup = {
                    key: groupKey,
                    items: []
                };
                result.push(selectedGroup)
            }
            selectedGroup.items.push(item)
        }.bind(this));
        return result
    },
    moveItemAtIndexToIndex: function(movingIndex, destinationIndex) {
        var items = this._collectionWidget.option("items"),
            movingIndices = splitIndex(movingIndex),
            destinationIndices = splitIndex(destinationIndex),
            movingItemGroup = items[movingIndices.group].items,
            destinationItemGroup = items[destinationIndices.group].items,
            movedItemData = movingItemGroup[movingIndices.item];
        movingItemGroup.splice(movingIndices.item, 1);
        destinationItemGroup.splice(destinationIndices.item, 0, movedItemData)
    },
    _isItemIndex: function(index) {
        return $.isNumeric(index.group) && $.isNumeric(index.item)
    },
    _getNormalizedItemIndex: function(itemElement) {
        var $item = $(itemElement),
            $group = $item.closest("." + LIST_GROUP_CLASS);
        if (!$group.length) {
            return -1
        }
        return combineIndex({
            group: this._groupElements().index($group),
            item: this._groupItemElements($group).index($item)
        })
    },
    _normalizeItemIndex: function(index) {
        return combineIndex(index)
    },
    _denormalizeItemIndex: function(index) {
        return splitIndex(index)
    },
    _getItemByNormalizedIndex: function(index) {
        var indices = splitIndex(index),
            $group = this._groupElements().eq(indices.group);
        return this._groupItemElements($group).eq(indices.item)
    },
    _itemsFromSameParent: function(firstIndex, secondIndex) {
        return splitIndex(firstIndex).group === splitIndex(secondIndex).group
    }
});
module.exports = GroupedEditStrategy;
