using Microsoft.Extensions.Logging;
using Common;

namespace WebApi.Test.Budget;

public class BudgetTest : BaseTest
{
    private readonly IBudgetRepository _budgetRepository = Substitute.For<IBudgetRepository>();
    private readonly IBudgetArchiveRepository _budgetArchiveRepository = Substitute.For<IBudgetArchiveRepository>();
    private readonly ITransactionRecordRepository _transactionsRepository = Substitute.For<ITransactionRecordRepository>();
    private readonly IOpenAiService _openAiService = Substitute.For<IOpenAiService>();
    private readonly IMessageService _messageService = Substitute.For<IMessageService>();
    private readonly ILogger<BudgetService> _logger = Substitute.For<ILogger<BudgetService>>();
    private readonly IBudgetSavingsService _budgetSavingsService = Substitute.For<IBudgetSavingsService>();
    private readonly IDateTimeProvider _dateTimeProvider = Substitute.For<IDateTimeProvider>();
    private readonly BudgetService _service;

    public BudgetTest()
    {
        _dateTimeProvider.Now.Returns(new DateTime(2024, 1, 15));
        _service = new BudgetService(
            _budgetRepository,
            _budgetArchiveRepository,
            _transactionsRepository,
            _openAiService,
            _messageService,
            _logger,
            _budgetSavingsService,
            _dateTimeProvider
        );
    }

    [Fact]
    public async Task GetCategoryStats_月度_Test()
    {
        // Arrange
        var referenceDate = new DateTime(2024, 1, 15);
        var budgets = new List<BudgetRecord>
        {
            new() { Id = 1, Name = "吃喝", Limit = 2000, Category = BudgetCategory.Expense, Type = BudgetPeriodType.Month, SelectedCategories = "餐饮,零食" },
            new() { Id = 2, Name = "交通", Limit = 500, Category = BudgetCategory.Expense, Type = BudgetPeriodType.Month, SelectedCategories = "交通" }
        };

        _budgetRepository.GetAllAsync().Returns(budgets);
        _budgetRepository.GetCurrentAmountAsync(Arg.Any<BudgetRecord>(), Arg.Any<DateTime>(), Arg.Any<DateTime>())
            .Returns(args =>
            {
                var b = (BudgetRecord)args[0];
                return b.Name == "吃喝" ? 1200m : 300m;
            });
        _transactionsRepository.GetFilteredTrendStatisticsAsync(Arg.Any<DateTime>(), Arg.Any<DateTime>(), Arg.Any<TransactionType>(), Arg.Any<List<string>>(), Arg.Any<bool>())
            .Returns(new Dictionary<DateTime, decimal>());

        // Act
        var result = await _service.GetCategoryStatsAsync(BudgetCategory.Expense, referenceDate);

        // Assert
        result.Month.Limit.Should().Be(2500);
        result.Month.Current.Should().Be(1500);
        result.Month.Count.Should().Be(2);
        result.Month.Rate.Should().Be(1500m / 2500m * 100);
    }

    [Fact]
    public async Task GetCategoryStats_月度_硬性收支_Test()
    {
        // Arrange
        var referenceDate = new DateTime(2024, 1, 15);
        var budgets = new List<BudgetRecord>
        {
            new() { Id = 1, Name = "房租", Limit = 3100, Category = BudgetCategory.Expense, Type = BudgetPeriodType.Month, IsMandatoryExpense = true }
        };

        _budgetRepository.GetAllAsync().Returns(budgets);
        _budgetRepository.GetCurrentAmountAsync(Arg.Any<BudgetRecord>(), Arg.Any<DateTime>(), Arg.Any<DateTime>())
            .Returns(0m); // 实际支出的金额为0
        
        _dateTimeProvider.Now.Returns(referenceDate);
        _transactionsRepository.GetFilteredTrendStatisticsAsync(Arg.Any<DateTime>(), Arg.Any<DateTime>(), Arg.Any<TransactionType>(), Arg.Any<List<string>>(), Arg.Any<bool>())
            .Returns(new Dictionary<DateTime, decimal>());

        // Act
        var result = await _service.GetCategoryStatsAsync(BudgetCategory.Expense, referenceDate);

        // Assert
        // 1月有31天，15号经过了15天
        // 3100 * 15 / 31 = 1500
        result.Month.Limit.Should().Be(3100);
        result.Month.Current.Should().Be(1500);
    }

    [Fact]
    public async Task GetCategoryStats_年度_1月_Test()
    {
        // Arrange
        var referenceDate = new DateTime(2024, 1, 15);
        var budgets = new List<BudgetRecord>
        {
            new() { Id = 1, Name = "年度旅游", Limit = 12000, Category = BudgetCategory.Expense, Type = BudgetPeriodType.Year }
        };

        _budgetRepository.GetAllAsync().Returns(budgets);
        _budgetRepository.GetCurrentAmountAsync(Arg.Any<BudgetRecord>(), Arg.Is<DateTime>(d => d.Month == 1 && d.Day == 1), Arg.Is<DateTime>(d => d.Month == 12 && d.Day == 31))
            .Returns(2000m);
        _transactionsRepository.GetFilteredTrendStatisticsAsync(Arg.Any<DateTime>(), Arg.Any<DateTime>(), Arg.Any<TransactionType>(), Arg.Any<List<string>>(), Arg.Any<bool>())
            .Returns(new Dictionary<DateTime, decimal>());

        // Act
        var result = await _service.GetCategoryStatsAsync(BudgetCategory.Expense, referenceDate);

        // Assert
        // 月度统计中，年度预算被忽略 (Limit=0)
        result.Month.Limit.Should().Be(0);
        result.Month.Current.Should().Be(0);
        
        // 年度统计中
        result.Year.Limit.Should().Be(12000);
        result.Year.Current.Should().Be(2000);
    }

    [Fact]
    public async Task GetCategoryStats_年度_1月_硬性收支_Test()
    {
        // Arrange
        var referenceDate = new DateTime(2024, 1, 1); // 元旦
        var budgets = new List<BudgetRecord>
        {
            new() { Id = 1, Name = "年度固定支出", Limit = 3660, Category = BudgetCategory.Expense, Type = BudgetPeriodType.Year, IsMandatoryExpense = true }
        };

        _budgetRepository.GetAllAsync().Returns(budgets);
        _budgetRepository.GetCurrentAmountAsync(Arg.Any<BudgetRecord>(), Arg.Any<DateTime>(), Arg.Any<DateTime>()).Returns(0m);
        _dateTimeProvider.Now.Returns(referenceDate);
        _transactionsRepository.GetFilteredTrendStatisticsAsync(Arg.Any<DateTime>(), Arg.Any<DateTime>(), Arg.Any<TransactionType>(), Arg.Any<List<string>>(), Arg.Any<bool>())
            .Returns(new Dictionary<DateTime, decimal>());

        // Act
        var result = await _service.GetCategoryStatsAsync(BudgetCategory.Expense, referenceDate);

        // Assert
        // 2024是闰年，366天。1月1号是第1天。
        // 3660 * 1 / 366 = 10
        result.Year.Limit.Should().Be(3660);
        result.Year.Current.Should().Be(10);
    }

    [Fact]
    public async Task GetCategoryStats_年度_3月_硬性收支_Test()
    {
        // Arrange
        var referenceDate = new DateTime(2024, 3, 31); // 3月最后一天
        var budgets = new List<BudgetRecord>
        {
            new() { Id = 1, Name = "年度固定支出", Limit = 3660, Category = BudgetCategory.Expense, Type = BudgetPeriodType.Year, IsMandatoryExpense = true }
        };

        _budgetRepository.GetAllAsync().Returns(budgets);
        _budgetRepository.GetCurrentAmountAsync(Arg.Any<BudgetRecord>(), Arg.Any<DateTime>(), Arg.Any<DateTime>()).Returns(0m);
        _dateTimeProvider.Now.Returns(referenceDate);
        _transactionsRepository.GetFilteredTrendStatisticsAsync(Arg.Any<DateTime>(), Arg.Any<DateTime>(), Arg.Any<TransactionType>(), Arg.Any<List<string>>(), Arg.Any<bool>())
            .Returns(new Dictionary<DateTime, decimal>());

        // Act
        var result = await _service.GetCategoryStatsAsync(BudgetCategory.Expense, referenceDate);

        // Assert
        // 2024是闰年。1月(31) + 2月(29) + 3月(31) = 91天
        // 3660 * 91 / 366 = 910
        result.Year.Limit.Should().Be(3660);
        result.Year.Current.Should().Be(910);
    }
}