using System;
using System.Collections.Generic;
using YLErp.DBModels;
using YLErp.Modules.MarginModule;

namespace YLErp.Modules.CalcModules
{
    /// <summary>
    /// 模板同层多候选取舍纯函数测试（MarginTemplateV2RateHelper.PickByBookScopePreference，2026-08-28 裁定）：
    /// 簿记条件满足者优先，其次生效日最新。不连库。
    /// </summary>
    [TestClass]
    public class MarginTemplateV2BookScopePreferenceTest
    {
        private static readonly DateTime Newer = new DateTime(2026, 8, 1);
        private static readonly DateTime Older = new DateTime(2026, 1, 1);

        private static margin_template_v2 Tpl(int id, DateTime valueDate, string bookIds = null)
        {
            return new margin_template_v2 { id = id, ValueDate = valueDate, BookIds = bookIds, IsValid = true };
        }

        [TestMethod]
        public void BP_01_双默认同日_限定簿记匹配_压过id更新的通配()
        {
            //复刻 dev 274/275 场景：同生效日按 id 降序，通配模板排前、限定簿记(45)排后；交易簿记=45
            var candidates = new List<margin_template_v2> { Tpl(275, Older), Tpl(274, Older, "45") };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, 45, out var byBook);
            Assert.AreEqual(274, picked.id, "簿记条件满足的限定模板应压过同日 id 更新的通配模板");
            Assert.IsTrue(byBook, "命中由簿记匹配优先产生时应置 preferredByBookScope");
        }

        [TestMethod]
        public void BP_02_簿记不匹配_通配胜出()
        {
            //交易簿记=45 不在限定范围(38)内：限定模板不适用，按序取通配（2573 客需债券簿记场景）
            var candidates = new List<margin_template_v2> { Tpl(275, Older), Tpl(274, Older, "38") };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, 45, out var byBook);
            Assert.AreEqual(275, picked.id);
            Assert.IsFalse(byBook);
        }

        [TestMethod]
        public void BP_03_无限定候选_取生效日最新()
        {
            var candidates = new List<margin_template_v2> { Tpl(2, Newer), Tpl(1, Older) };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, 45, out var byBook);
            Assert.AreEqual(2, picked.id, "无簿记限定候选时维持原口径：生效日最新胜出");
            Assert.IsFalse(byBook);
        }

        [TestMethod]
        public void BP_04_多限定都匹配_取生效日最新()
        {
            var candidates = new List<margin_template_v2> { Tpl(2, Newer, "45,46"), Tpl(1, Older, "45") };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, 45, out var byBook);
            Assert.AreEqual(2, picked.id, "多个簿记条件满足的候选之间仍按生效日最新取第一个");
            Assert.IsFalse(byBook, "第一个适用候选即簿记匹配时不算'优先压过'");
        }

        [TestMethod]
        public void BP_05_限定匹配_压过生效日更新的通配()
        {
            var candidates = new List<margin_template_v2> { Tpl(2, Newer), Tpl(1, Older, "45") };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, 45, out var byBook);
            Assert.AreEqual(1, picked.id, "簿记条件满足优先于生效日新旧");
            Assert.IsTrue(byBook);
        }

        [TestMethod]
        public void BP_06_全部不适用_返回null()
        {
            var candidates = new List<margin_template_v2> { Tpl(1, Newer, "38") };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, 45, out _);
            Assert.IsNull(picked, "候选均不适用当前簿记账户时应返回 null（穿透/未命中由调用方处理）");
        }

        [TestMethod]
        public void BP_07_交易无簿记账户_限定视为不适用()
        {
            //tradeId 查不到 AssetId 时入参为 null：显式限定模板视为不适用，通配仍可用
            var candidates = new List<margin_template_v2> { Tpl(2, Newer), Tpl(1, Older, "45") };
            var picked = MarginTemplateV2RateHelper.PickByBookScopePreference(candidates, null, out var byBook);
            Assert.AreEqual(2, picked.id);
            Assert.IsFalse(byBook);
        }

        [TestMethod]
        public void BP_08_空候选或null_返回null()
        {
            Assert.IsNull(MarginTemplateV2RateHelper.PickByBookScopePreference(new List<margin_template_v2>(), 45, out _));
            Assert.IsNull(MarginTemplateV2RateHelper.PickByBookScopePreference(null, 45, out _));
        }
    }
}