EmailBill/WebApi.Test/Application/TransactionStatisticsApplicationTest.cs

using Application.Dto.Statistics;
using Service.Transaction;

namespace WebApi.Test.Application;

/// <summary>
/// TransactionStatisticsApplication 单元测试
/// </summary>
public class TransactionStatisticsApplicationTest : BaseApplicationTest
{
    private readonly ITransactionStatisticsService _statisticsService;
    private readonly IConfigService _configService;
    private readonly TransactionStatisticsApplication _application;

    public TransactionStatisticsApplicationTest()
    {
        _statisticsService = Substitute.For<ITransactionStatisticsService>();
        _configService = Substitute.For<IConfigService>();
        _application = new TransactionStatisticsApplication(_statisticsService, _configService);
    }

    #region GetBalanceStatisticsAsync Tests

    [Fact]
    public async Task GetBalanceStatisticsAsync_有效数据_应返回累计余额统计()
    {
        // Arrange
        var year = 2026;
        var month = 2;
        var savingClassify = "储蓄";
        var dailyStats = new Dictionary<string, (int count, decimal expense, decimal income, decimal saving)>
        {
            { "2026-02-01", (2, 500m, 1000m, 0m) },
            { "2026-02-02", (1, 200m, 0m, 0m) },
            { "2026-02-03", (2, 300m, 2000m, 0m) }
        };

        _configService.GetConfigByKeyAsync<string>("SavingsCategories").Returns(savingClassify);
        _statisticsService.GetDailyStatisticsAsync(year, month, savingClassify).Returns(dailyStats);

        // Act
        var result = await _application.GetBalanceStatisticsAsync(year, month);

        // Assert
        result.Should().HaveCount(3);
        result[0].Day.Should().Be(1);
        result[0].CumulativeBalance.Should().Be(500m); // 1000 - 500
        result[1].Day.Should().Be(2);
        result[1].CumulativeBalance.Should().Be(300m); // 500 + (0 - 200)
        result[2].Day.Should().Be(3);
        result[2].CumulativeBalance.Should().Be(2000m); // 300 + (2000 - 300)
    }

    [Fact]
    public async Task GetBalanceStatisticsAsync_无数据_应返回空列表()
    {
        // Arrange
        var year = 2026;
        var month = 2;
        _configService.GetConfigByKeyAsync<string>("SavingsCategories").Returns("储蓄");
        _statisticsService.GetDailyStatisticsAsync(year, month, "储蓄")
            .Returns(new Dictionary<string, (int, decimal, decimal, decimal)>());

        // Act
        var result = await _application.GetBalanceStatisticsAsync(year, month);

        // Assert
        result.Should().BeEmpty();
    }

    #endregion

    #region GetDailyStatisticsAsync Tests

    [Fact]
    public async Task GetDailyStatisticsAsync_有效数据_应返回每日统计()
    {
        // Arrange
        var year = 2026;
        var month = 2;
        var dailyStats = new Dictionary<string, (int count, decimal expense, decimal income, decimal saving)>
        {
            { "2026-02-10", (3, 500m, 1000m, 100m) },
            { "2026-02-11", (5, 800m, 2000m, 200m) }
        };

        _configService.GetConfigByKeyAsync<string>("SavingsCategories").Returns("储蓄");
        _statisticsService.GetDailyStatisticsAsync(year, month, "储蓄").Returns(dailyStats);

        // Act
        var result = await _application.GetDailyStatisticsAsync(year, month);

        // Assert
        result.Should().HaveCount(2);
        result.Should().Contain(s => s.Day == 10 && s.Income == 1000m && s.Expense == 500m && s.Count == 3 && s.Saving == 100m);
        result.Should().Contain(s => s.Day == 11 && s.Income == 2000m && s.Expense == 800m && s.Count == 5 && s.Saving == 200m);
    }

    #endregion

    #region GetWeeklyStatisticsAsync Tests

    [Fact]
    public async Task GetWeeklyStatisticsAsync_有效日期范围_应返回周统计()
    {
        // Arrange
        var startDate = new DateTime(2026, 2, 1);
        var endDate = new DateTime(2026, 2, 7);
        var weeklyStats = new Dictionary<string, (int count, decimal expense, decimal income, decimal saving)>
        {
            { "2026-02-01", (2, 200m, 500m, 50m) },
            { "2026-02-07", (3, 300m, 800m, 100m) }
        };

        _configService.GetConfigByKeyAsync<string>("SavingsCategories").Returns("储蓄");
        _statisticsService.GetDailyStatisticsByRangeAsync(startDate, endDate, "储蓄").Returns(weeklyStats);

        // Act
        var result = await _application.GetWeeklyStatisticsAsync(startDate, endDate);

        // Assert
        result.Should().HaveCount(2);
        result.Should().Contain(s => s.Day == 1 && s.Income == 500m && s.Expense == 200m);
        result.Should().Contain(s => s.Day == 7 && s.Income == 800m && s.Expense == 300m);
    }

    #endregion

    #region GetRangeStatisticsAsync Tests

    [Fact]
    public async Task GetRangeStatisticsAsync_有效日期范围_应返回汇总统计()
    {
        // Arrange
        var startDate = new DateTime(2026, 2, 1);
        var endDate = new DateTime(2026, 2, 28);
        var rangeStats = new Dictionary<string, (int count, decimal expense, decimal income, decimal saving)>
        {
            { "2026-02-01", (3, 500m, 1000m, 0m) },
            { "2026-02-02", (4, 800m, 2000m, 0m) },
            { "2026-02-03", (2, 300m, 0m, 0m) }
        };

        _statisticsService.GetDailyStatisticsByRangeAsync(startDate, endDate, null).Returns(rangeStats);

        // Act
        var result = await _application.GetRangeStatisticsAsync(startDate, endDate);

        // Assert
        result.Year.Should().Be(2026);
        result.Month.Should().Be(2);
        result.TotalIncome.Should().Be(3000m);
        result.TotalExpense.Should().Be(1600m);
        result.Balance.Should().Be(1400m);
        result.TotalCount.Should().Be(9);
        result.ExpenseCount.Should().Be(3);
        result.IncomeCount.Should().Be(2);
    }

    #endregion

    #region GetMonthlyStatisticsAsync Tests

    [Fact]
    public async Task GetMonthlyStatisticsAsync_有效年月_应返回月度统计()
    {
        // Arrange
        var year = 2026;
        var month = 2;
        var monthlyStats = new MonthlyStatistics
        {
            Year = year,
            Month = month,
            TotalIncome = 5000m,
            TotalExpense = 3000m,
            Balance = 2000m,
            IncomeCount = 10,
            ExpenseCount = 15,
            TotalCount = 25
        };

        _statisticsService.GetMonthlyStatisticsAsync(year, month).Returns(monthlyStats);

        // Act
        var result = await _application.GetMonthlyStatisticsAsync(year, month);

        // Assert
        result.Should().NotBeNull();
        result.Year.Should().Be(year);
        result.Month.Should().Be(month);
        result.TotalIncome.Should().Be(5000m);
        result.TotalExpense.Should().Be(3000m);
        result.Balance.Should().Be(2000m);
    }

    #endregion

    #region GetCategoryStatisticsAsync Tests

    [Fact]
    public async Task GetCategoryStatisticsAsync_有效参数_应返回分类统计()
    {
        // Arrange
        var year = 2026;
        var month = 2;
        var type = TransactionType.Expense;
        var categoryStats = new List<CategoryStatistics>
        {
            new() { Classify = "餐饮", Amount = 1000m, Count = 10 },
            new() { Classify = "交通", Amount = 500m, Count = 5 }
        };

        _statisticsService.GetCategoryStatisticsAsync(year, month, type).Returns(categoryStats);

        // Act
        var result = await _application.GetCategoryStatisticsAsync(year, month, type);

        // Assert
        result.Should().HaveCount(2);
        result.Should().Contain(s => s.Classify == "餐饮" && s.Amount == 1000m);
        result.Should().Contain(s => s.Classify == "交通" && s.Amount == 500m);
    }

    #endregion

    #region GetCategoryStatisticsByDateRangeAsync Tests

    [Fact]
    public async Task GetCategoryStatisticsByDateRangeAsync_有效日期字符串_应返回分类统计()
    {
        // Arrange
        var startDate = "2026-02-01";
        var endDate = "2026-02-28";
        var type = TransactionType.Expense;
        var categoryStats = new List<CategoryStatistics>
        {
            new() { Classify = "餐饮", Amount = 1500m, Count = 15 }
        };

        _statisticsService.GetCategoryStatisticsByDateRangeAsync(
            DateTime.Parse(startDate), 
            DateTime.Parse(endDate), 
            type
        ).Returns(categoryStats);

        // Act
        var result = await _application.GetCategoryStatisticsByDateRangeAsync(startDate, endDate, type);

        // Assert
        result.Should().HaveCount(1);
        result[0].Classify.Should().Be("餐饮");
        result[0].Amount.Should().Be(1500m);
    }

    [Fact]
    public async Task GetCategoryStatisticsByDateRangeAsync_无效日期格式_应抛出异常()
    {
        // Arrange
        var startDate = "invalid-date";
        var endDate = "2026-02-28";
        var type = TransactionType.Expense;

        // Act & Assert
        await Assert.ThrowsAsync<FormatException>(() => 
            _application.GetCategoryStatisticsByDateRangeAsync(startDate, endDate, type));
    }

    #endregion

    #region GetTrendStatisticsAsync Tests

    [Fact]
    public async Task GetTrendStatisticsAsync_有效参数_应返回趋势统计()
    {
        // Arrange
        var startYear = 2026;
        var startMonth = 1;
        var monthCount = 3;
        var trendStats = new List<TrendStatistics>
        {
            new() { Year = 2026, Month = 1, Income = 5000m, Expense = 3000m },
            new() { Year = 2026, Month = 2, Income = 6000m, Expense = 3500m },
            new() { Year = 2026, Month = 3, Income = 5500m, Expense = 3200m }
        };

        _statisticsService.GetTrendStatisticsAsync(startYear, startMonth, monthCount).Returns(trendStats);

        // Act
        var result = await _application.GetTrendStatisticsAsync(startYear, startMonth, monthCount);

        // Assert
        result.Should().HaveCount(3);
        result[0].Year.Should().Be(2026);
        result[0].Month.Should().Be(1);
    }

    #endregion

    #region GetReasonGroupsAsync Tests

    [Fact]
    public async Task GetReasonGroupsAsync_有效分页参数_应返回分组数据()
    {
        // Arrange
        var pageIndex = 1;
        var pageSize = 10;
        var reasonGroups = new List<ReasonGroupDto>
        {
            new() { Reason = "餐饮", Count = 20, TotalAmount = 1500m },
            new() { Reason = "交通", Count = 15, TotalAmount = 800m }
        };
        var total = 50;

        _statisticsService.GetReasonGroupsAsync(pageIndex, pageSize).Returns((reasonGroups, total));

        // Act
        var result = await _application.GetReasonGroupsAsync(pageIndex, pageSize);

        // Assert
        result.list.Should().HaveCount(2);
        result.total.Should().Be(50);
        result.list[0].Reason.Should().Be("餐饮");
    }

    #endregion
}