using System;
using System.IO;

namespace YLErp.Modules.EodModule
{
    [TestClass]
    public class DividendBasketQueryTranslationTest
    {
        [TestMethod]
        public void DividendBasketQueriesUseEfTranslatableCommodityCondition()
        {
            var source = ReadDividendServiceSource();
            var addDividendQuery = ExtractQuery(
                source,
                "var basketList =",
                "IEnumerable<eod_stock_price> priceList = null;");
            var executeStatusQuery = ExtractQuery(
                source,
                "var umList = DataCacheProvider.GetUnderlyingDataSource().AsQueryable(",
                ").Select(O => O.UnderlyingCode).ToArray();");

            AssertQueryUsesCommodityCondition(addDividendQuery, "AddDividendInfos");
            AssertQueryUsesCommodityCondition(executeStatusQuery, "checkDividendInfoExecuteStatus");
        }

        private static void AssertQueryUsesCommodityCondition(string query, string methodName)
        {
            Assert.IsFalse(
                query.Contains("IsBasket()", StringComparison.Ordinal),
                $"{methodName} must not put IsBasket() in an IQueryable predicate.");
            Assert.IsTrue(
                query.Contains("O.CommodityCode == \"篮子标的\"", StringComparison.Ordinal),
                $"{methodName} must filter baskets with the EF-translatable CommodityCode condition.");
        }

        private static string ExtractQuery(string source, string startMarker, string endMarker)
        {
            var start = source.IndexOf(startMarker, StringComparison.Ordinal);
            Assert.IsTrue(start >= 0, $"Could not find query marker: {startMarker}");
            var end = source.IndexOf(endMarker, start + startMarker.Length, StringComparison.Ordinal);
            Assert.IsTrue(end >= 0, $"Could not find query end marker: {endMarker}");
            return source.Substring(start, end + endMarker.Length - start);
        }

        private static string ReadDividendServiceSource()
        {
            var directory = new DirectoryInfo(AppContext.BaseDirectory);
            while (directory != null)
            {
                var path = Path.Combine(
                    directory.FullName,
                    "YLErpDAL",
                    "Modules",
                    "TradeModule",
                    "DealModule",
                    "DividendService.cs");
                if (File.Exists(path))
                {
                    return File.ReadAllText(path);
                }
                directory = directory.Parent;
            }

            Assert.Fail("Could not locate DividendService.cs from the test output directory.");
            return string.Empty;
        }
    }
}