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; }
}

// ============================================================
// SALES TAX REPORT
// ============================================================

public class SalesTaxReportDto
{
    public DateTime From { get; set; }
    public DateTime To { get; set; }
    public string CompanyName { get; set; } = string.Empty;

    /// <summary>Subtotal of invoices where TaxAmount > 0.</summary>
    public decimal TotalTaxableSales { get; set; }
    /// <summary>Subtotal of invoices where TaxAmount == 0.</summary>
    public decimal TotalNonTaxableSales { get; set; }
    /// <summary>Sum of all TaxAmount values across the period.</summary>
    public decimal TotalTaxBilled { get; set; }
    public int TaxableInvoiceCount { get; set; }
    public int NonTaxableInvoiceCount { get; set; }
    public decimal EffectiveTaxRate => TotalTaxableSales == 0 ? 0
        : Math.Round(TotalTaxBilled / TotalTaxableSales * 100, 2);

    public List<SalesTaxByAccountDto> ByAccount { get; set; } = new();
    public List<SalesTaxByMonthDto> ByMonth { get; set; } = new();
    public List<SalesTaxInvoiceLineDto> Invoices { get; set; } = new();
}

public class SalesTaxByAccountDto
{
    public int? AccountId { get; set; }
    public string AccountName { get; set; } = string.Empty;
    public string AccountNumber { get; set; } = string.Empty;
    public decimal TaxableSales { get; set; }
    public decimal TaxBilled { get; set; }
    public int InvoiceCount { get; set; }
}

public class SalesTaxByMonthDto
{
    public int Year { get; set; }
    public int Month { get; set; }
    public string Label { get; set; } = string.Empty;
    public decimal TaxableSales { get; set; }
    public decimal TaxBilled { get; set; }
    public int InvoiceCount { get; set; }
}

public class SalesTaxInvoiceLineDto
{
    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 string Status { get; set; } = string.Empty;
    public decimal SubTotal { get; set; }
    public decimal TaxPercent { get; set; }
    public decimal TaxAmount { get; set; }
    public decimal Total { get; set; }
    public decimal AmountPaid { get; set; }
    public decimal BalanceDue { get; set; }
    public string TaxAccountName { get; set; } = string.Empty;
}