using Microsoft.VisualStudio.TestTools.UnitTesting;
using YLErp.Derivatives.Interest;
using YLErp.Modules.SwapModule.Margin;

namespace UnitTestProject.Modules.SwapModule.Margin
{
    /// <summary>
    /// 保证金账户(MarginAccount)单测。验证余额变动（追加/释放/返还）。
    /// 保证金就是保证金——有余额、有利率、有利息，不存在"计息基数/Notional"概念。
    /// </summary>
    [TestClass]
    public class MarginLegTest
    {
        private const decimal Opening = 2_000_000m;

        #region MarginAccount 余额变动

        [TestMethod]
        public void 账户_初始余额等于期初保证金()
        {
            var account = new MarginAccount(new MarginBalance(Opening));
            Assert.AreEqual(Opening, account.Balance.Balance);
        }

        [TestMethod]
        public void 账户_追加保证金_余额增加()
        {
            var account = new MarginAccount(new MarginBalance(Opening));
            account.Deposit(500_000m);
            Assert.AreEqual(2_500_000m, account.Balance.Balance);
        }

        [TestMethod]
        public void 账户_释放保证金_余额减少()
        {
            var account = new MarginAccount(new MarginBalance(Opening));
            account.Withdraw(800_000m);
            Assert.AreEqual(1_200_000m, account.Balance.Balance);
        }

        [TestMethod]
        public void 账户_释放超过余额_不低于零()
        {
            var account = new MarginAccount(new MarginBalance(Opening));
            account.Withdraw(3_000_000m);
            Assert.AreEqual(0m, account.Balance.Balance, "保证金余额不低于零");
        }

        #endregion

        #region 三种保证金形态解析器

        [TestMethod]
        public void 三种形态解析器_各自返回正确Form和余额()
        {
            IMarginResolver cash = new CashMargin();
            IMarginResolver credit = new CreditMargin();
            IMarginResolver guarantee = new GuaranteeMargin();

            Assert.AreEqual(MarginForm.Cash, cash.Form);
            Assert.AreEqual(MarginForm.Credit, credit.Form);
            Assert.AreEqual(MarginForm.Guarantee, guarantee.Form);

            Assert.AreEqual(Opening, cash.Resolve(Opening).Balance);
            Assert.AreEqual(Opening, credit.Resolve(Opening).Balance);
            Assert.AreEqual(Opening, guarantee.Resolve(Opening).Balance);
        }

        #endregion

        #region MarginAccount 计息

        [TestMethod]
        public void 计息_单利7天_余额200万年化3pct()
        {
            var account = new MarginAccount(new MarginBalance(2_000_000m));
            // 200万 × 3% / 365 × 7天 = 1150.68...
            var r = account.AccrueInterest(
                rate: 0.03m,
                startDate: new System.DateTime(2026, 5, 4),
                endDate: new System.DateTime(2026, 5, 11),
                boundary: AccrualBoundary.StartOnly,
                annualDays: 365);

            Assert.IsTrue(r.Accrued > 0, "7天利息应大于0");
            System.Console.WriteLine($"保证金7天利息={r.Accrued}");
        }

        [TestMethod]
        public void 计息_零余额_利息为零()
        {
            var account = new MarginAccount(new MarginBalance(0m));
            var r = account.AccrueInterest(0.03m,
                new System.DateTime(2026, 5, 4), new System.DateTime(2026, 5, 11),
                AccrualBoundary.StartOnly, 365);

            Assert.AreEqual(0m, r.Accrued);
        }

        [TestMethod]
        public void 计息_释放后余额减少_利息相应减少()
        {
            var full = new MarginAccount(new MarginBalance(2_000_000m));
            var half = new MarginAccount(new MarginBalance(2_000_000m));
            half.Withdraw(1_000_000m);

            var rFull = full.AccrueInterest(0.03m,
                new System.DateTime(2026, 5, 4), new System.DateTime(2026, 5, 11),
                AccrualBoundary.StartOnly, 365);
            var rHalf = half.AccrueInterest(0.03m,
                new System.DateTime(2026, 5, 4), new System.DateTime(2026, 5, 11),
                AccrualBoundary.StartOnly, 365);

            Assert.IsTrue(rHalf.Accrued < rFull.Accrued, "释放后利息应更少");
            Assert.IsTrue(System.Math.Abs(rFull.Accrued - rHalf.Accrued * 2m) < 0.01m,
                "余额减半, 利息也应减半");
        }

        #endregion
    }
}