using Microsoft.VisualStudio.TestTools.UnitTesting;
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
    }
}