namespace SampleWebApi.Models;

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; } = "";
    public string Description { get; set; } = "";
    public string Category { get; set; } = "";
    public decimal Price { get; set; }
    public int StockQuantity { get; set; }
    public DateTime CreatedAt { get; set; }
    public DateTime UpdatedAt { get; set; }
}

public class Order
{
    public int Id { get; set; }
    public string CustomerId { get; set; } = "";
    public DateTime OrderDate { get; set; }
    public decimal TotalAmount { get; set; }
    public string Status { get; set; } = "";
    public List<OrderItem> Items { get; set; } = new();
}

public class OrderItem
{
    public int Id { get; set; }
    public int OrderId { get; set; }
    public int ProductId { get; set; }
    public int Quantity { get; set; }
    public decimal UnitPrice { get; set; }
    public decimal TotalPrice { get; set; }
    
    public Order Order { get; set; } = null!;
    public Product Product { get; set; } = null!;
}

public class Customer
{
    public string Id { get; set; } = "";
    public string Name { get; set; } = "";
    public string Email { get; set; } = "";
    public DateTime RegisteredAt { get; set; }
    public List<Order> Orders { get; set; } = new();
}

public class PagedResult<T>
{
    public List<T> Items { get; set; } = new();
    public int Page { get; set; }
    public int PageSize { get; set; }
    public int TotalCount { get; set; }
    public int TotalPages => (int)Math.Ceiling(TotalCount / (double)PageSize);
    public bool HasNextPage => Page < TotalPages;
    public bool HasPreviousPage => Page > 1;
}

public class ProductStatistics
{
    public int TotalProducts { get; set; }
    public decimal AveragePrice { get; set; }
    public decimal MinPrice { get; set; }
    public decimal MaxPrice { get; set; }
    public Dictionary<string, int> ProductsByCategory { get; set; } = new();
    public Dictionary<string, decimal> AveragePriceByCategory { get; set; } = new();
    public long ComputationTimeMs { get; set; }
    public string ComputationMethod { get; set; } = ""; // "InMemory" or "External"
}

public class CategoryRevenue
{
    public string Category { get; set; } = "";
    public decimal TotalRevenue { get; set; }
    public int OrderCount { get; set; }
    public decimal AverageOrderValue { get; set; }
}

public class CustomerSummary
{
    public string CustomerId { get; set; } = "";
    public string CustomerName { get; set; } = "";
    public int TotalOrders { get; set; }
    public decimal TotalSpent { get; set; }
    public decimal AverageOrderValue { get; set; }
    public DateTime FirstOrderDate { get; set; }
    public DateTime LastOrderDate { get; set; }
}

public class RealTimeAnalytics
{
    public DateTime Timestamp { get; set; }
    public int OrdersLastHour { get; set; }
    public decimal RevenueLastHour { get; set; }
    public int ActiveCustomers { get; set; }
    public Dictionary<string, int> TopProductsLastHour { get; set; } = new();
    public double OrdersPerMinute { get; set; }
}

public class BulkUpdateState
{
    public string OperationId { get; set; } = "";
    public int ProcessedCount { get; set; }
    public int UpdatedCount { get; set; }
    public int FailedCount { get; set; }
    public DateTime LastCheckpoint { get; set; }
}

public class ReportState
{
    public string ReportId { get; set; } = "";
    public int ProgressPercent { get; set; }
    public Dictionary<string, object> PartialResults { get; set; } = new();
    public DateTime LastCheckpoint { get; set; }
}

public class PatternAnalysisResult
{
    public Dictionary<string, double> OrderPatterns { get; set; } = new();
    public List<CustomerSegment> CustomerSegments { get; set; } = new();
    public SeasonalAnalysis? SeasonalAnalysis { get; set; }
    public long AnalysisTimeMs { get; set; }
    public long RecordsProcessed { get; set; }
    public long MemoryUsedMB { get; set; }
}

public class CustomerSegment
{
    public string SegmentName { get; set; } = "";
    public int CustomerCount { get; set; }
    public Dictionary<string, double> Characteristics { get; set; } = new();
}

public class SeasonalAnalysis
{
    public Dictionary<string, double> MonthlySalesPattern { get; set; } = new();
    public Dictionary<string, double> WeeklySalesPattern { get; set; } = new();
    public List<string> PeakPeriods { get; set; } = new();
}

public class MemoryStatistics
{
    public long CurrentMemoryUsageMB { get; set; }
    public long PeakMemoryUsageMB { get; set; }
    public int ExternalSortOperations { get; set; }
    public int CheckpointsSaved { get; set; }
    public long DataSpilledToDiskMB { get; set; }
    public double CacheHitRate { get; set; }
    public string CurrentMemoryPressure { get; set; } = "";
}