namespace YLErp.Web.Models
{
    public class AssetUnitModel
    {
        /// <summary>
        /// 簿记账户组包含的簿记账户和已有的资产账户合并取交集
        /// </summary>
        public static IEnumerable<int> IntersectAssetUnits(IEnumerable<int> assetGroupIds,
            IEnumerable<int> reqAssetUnitIds, IEnumerable<int> userAssetUnitIds = null)

        {
            //首先合并所有的簿记账户ID,如果用户关联的资产账户为空集合直接返回
            //重点逻辑：任何一个传入的条件集合成立，则不能返回空集合，应返回一个0值的集合保证过滤条件生效

            var assetFlag = 0;

            IEnumerable<int> assetunitIds = null;

            if (reqAssetUnitIds != null && reqAssetUnitIds.Any(n => n > 0))
            {
                assetFlag = 1;
                assetunitIds = reqAssetUnitIds;
                if (userAssetUnitIds == null)
                {
                    assetunitIds = reqAssetUnitIds.Where(n => n > 0).ToArray();
                }
                else if (userAssetUnitIds.Any(n => n > 0))
                {
                    assetFlag |= 2;
                    assetunitIds = userAssetUnitIds.Intersect(reqAssetUnitIds).Where(n => n > 0).ToArray();
                }
            }
            else if (userAssetUnitIds != null) //传空集合表明请求用户没有绑定任何簿记
            {
                assetFlag |= 2;
                assetunitIds = userAssetUnitIds;
            }

            //然后将合并后的簿记账户ID和簿记账户组合并

            if (assetGroupIds == null || !assetGroupIds.Any(n => n >= 0))
            {
                return assetFlag > 0 ? (assetunitIds.Any(n => n > 0) ? assetunitIds : new[] { 0 }) : Enumerable.Empty<int>();
            }

            var groupAssetIds = DataCacheProvider.GetAssetUnitDataSource().AsQueryable()
                    .Where(x => assetGroupIds.Contains(x.GroupId)).Select(x => x.id).ToArray();

            if (assetFlag > 0)
            {
                assetunitIds = groupAssetIds.Intersect(assetunitIds).ToArray();
            }
            else
            {
                assetunitIds = groupAssetIds;
            }

            return assetunitIds.Any(n => n > 0) ? assetunitIds : new[] { 0 };
        }

        /// <summary>
        /// 获取簿记账户组选项数据
        /// </summary>
        public static List<SelectItem> GetAllAssetUnitGroupItem()
        {
            return DataCacheProvider.GetAssetUnitGroupDataSource().AsQueryable().Select(s => new SelectItem { Text = s.Name, Value = s.id.ToString() }).ToList();
        }
    }
}