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src/PowderCoating.Application/DTOs/Accounting/FinancialReportDtos.cs

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+using PowderCoating.Core.Enums;
+
+namespace PowderCoating.Application.DTOs.Accounting;
+
+// ── Profit & Loss ─────────────────────────────────────────────────────────────
+
+public class ProfitAndLossDto
+{
+    public DateTime From { get; set; }
+    public DateTime To { get; set; }
+    public string CompanyName { get; set; } = string.Empty;
+
+    public List<FinancialReportLine> RevenueLines { get; set; } = new();
+    public decimal TotalRevenue { get; set; }
+
+    public List<FinancialReportLine> CogsLines { get; set; } = new();
+    public decimal TotalCogs { get; set; }
+
+    public decimal GrossProfit => TotalRevenue - TotalCogs;
+    public decimal GrossMarginPercent => TotalRevenue == 0 ? 0 : Math.Round(GrossProfit / TotalRevenue * 100, 1);
+
+    public List<FinancialReportLine> ExpenseLines { get; set; } = new();
+    public decimal TotalExpenses { get; set; }
+
+    public decimal OperatingIncome => GrossProfit - TotalExpenses;
+    public decimal NetIncome => OperatingIncome;   // Extend later for other income/tax
+}
+
+public class FinancialReportLine
+{
+    public int AccountId { get; set; }
+    public string AccountNumber { get; set; } = string.Empty;
+    public string AccountName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+}
+
+// ── Balance Sheet ─────────────────────────────────────────────────────────────
+
+public class BalanceSheetDto
+{
+    public DateTime AsOf { get; set; }
+    public string CompanyName { get; set; } = string.Empty;
+
+    // Assets
+    public List<FinancialReportLine> CurrentAssets { get; set; } = new();
+    public List<FinancialReportLine> FixedAssets { get; set; } = new();
+    public List<FinancialReportLine> OtherAssets { get; set; } = new();
+    public decimal TotalAssets { get; set; }
+
+    // Liabilities
+    public List<FinancialReportLine> CurrentLiabilities { get; set; } = new();
+    public List<FinancialReportLine> LongTermLiabilities { get; set; } = new();
+    public decimal TotalLiabilities { get; set; }
+
+    // Equity
+    public List<FinancialReportLine> EquityLines { get; set; } = new();
+    public decimal RetainedEarnings { get; set; }   // Computed net income to date
+    public decimal TotalEquity { get; set; }
+
+    public decimal TotalLiabilitiesAndEquity => TotalLiabilities + TotalEquity;
+
+    // Helper: is the sheet balanced?
+    public bool IsBalanced => Math.Abs(TotalAssets - TotalLiabilitiesAndEquity) < 0.01m;
+}
+
+// ── AR Aging ──────────────────────────────────────────────────────────────────
+
+public class ArAgingReportDto
+{
+    public DateTime AsOf { get; set; }
+    public string CompanyName { get; set; } = string.Empty;
+
+    public List<ArAgingCustomerDto> Customers { get; set; } = new();
+
+    public decimal TotalCurrent { get; set; }
+    public decimal Total1to30 { get; set; }
+    public decimal Total31to60 { get; set; }
+    public decimal Total61to90 { get; set; }
+    public decimal TotalOver90 { get; set; }
+    public decimal TotalOutstanding => TotalCurrent + Total1to30 + Total31to60 + Total61to90 + TotalOver90;
+}
+
+public class ArAgingCustomerDto
+{
+    public int CustomerId { get; set; }
+    public string CustomerName { get; set; } = string.Empty;
+    public List<ArAgingInvoiceDto> Invoices { get; set; } = new();
+    public decimal TotalCurrent { get; set; }
+    public decimal Total1to30 { get; set; }
+    public decimal Total31to60 { get; set; }
+    public decimal Total61to90 { get; set; }
+    public decimal TotalOver90 { get; set; }
+    public decimal TotalBalance => TotalCurrent + Total1to30 + Total31to60 + Total61to90 + TotalOver90;
+}
+
+public class ArAgingInvoiceDto
+{
+    public int InvoiceId { get; set; }
+    public string InvoiceNumber { get; set; } = string.Empty;
+    public DateTime InvoiceDate { get; set; }
+    public DateTime? DueDate { get; set; }
+    public decimal BalanceDue { get; set; }
+    public int DaysOverdue { get; set; }
+}
+
+// ── Sales & Income ────────────────────────────────────────────────────────────
+
+public class SalesIncomeReportDto
+{
+    public DateTime From { get; set; }
+    public DateTime To { get; set; }
+    public string CompanyName { get; set; } = string.Empty;
+
+    public decimal TotalInvoiced { get; set; }
+    public decimal TotalCollected { get; set; }
+    public decimal TotalTax { get; set; }
+    public decimal TotalDiscount { get; set; }
+    public decimal NetRevenue => TotalInvoiced - TotalDiscount;
+    public int InvoiceCount { get; set; }
+    public int CustomerCount { get; set; }
+    public decimal AverageInvoiceValue => InvoiceCount == 0 ? 0 : Math.Round(TotalInvoiced / InvoiceCount, 2);
+
+    public List<SalesByCustomerDto> ByCustomer { get; set; } = new();
+    public List<SalesByMonthDto> ByMonth { get; set; } = new();
+    public List<SalesInvoiceLineDto> Invoices { get; set; } = new();
+}
+
+public class SalesByCustomerDto
+{
+    public int CustomerId { get; set; }
+    public string CustomerName { get; set; } = string.Empty;
+    public int InvoiceCount { get; set; }
+    public decimal TotalInvoiced { get; set; }
+    public decimal TotalPaid { get; set; }
+    public decimal BalanceDue { get; set; }
+}
+
+public class SalesByMonthDto
+{
+    public int Year { get; set; }
+    public int Month { get; set; }
+    public string Label { get; set; } = string.Empty;
+    public decimal TotalInvoiced { get; set; }
+    public decimal TotalCollected { get; set; }
+    public int InvoiceCount { get; set; }
+}
+
+public class SalesInvoiceLineDto
+{
+    public int InvoiceId { get; set; }
+    public string InvoiceNumber { get; set; } = string.Empty;
+    public string CustomerName { get; set; } = string.Empty;
+    public DateTime InvoiceDate { get; set; }
+    public DateTime? DueDate { get; set; }
+    public string Status { get; set; } = string.Empty;
+    public decimal SubTotal { get; set; }
+    public decimal TaxAmount { get; set; }
+    public decimal Total { get; set; }
+    public decimal AmountPaid { get; set; }
+    public decimal BalanceDue { get; set; }
+}