import '../core/utils/safe_convert.dart';
import 'student.dart';

class CurrencyInfo {
  final int id;
  final String name;
  final String symbol;

  const CurrencyInfo({
    required this.id,
    required this.name,
    required this.symbol,
  });

  factory CurrencyInfo.fromJson(Map<String, dynamic> json) {
    return CurrencyInfo(
      id: SafeConvert.toSafeInt(json['id']),
      name: SafeConvert.toSafeString(json['name'], 'INR'),
      symbol: SafeConvert.toSafeString(json['symbol'], '₹'),
    );
  }

  static CurrencyInfo? fromNullableJson(dynamic json) {
    final map = SafeConvert.toNullableMap(json);
    if (map == null) return null;
    return CurrencyInfo.fromJson(map);
  }
}

class FeeSummary {
  final double totalFees;
  final double totalPaid;
  final double outstandingBalance;
  final double overdueAmount;
  final String paymentStatus;
  final String? nextDueDate;
  final String? lastPaymentDate;
  final String? lastReceiptNumber;
  final CurrencyInfo? currency;

  const FeeSummary({
    required this.totalFees,
    required this.totalPaid,
    required this.outstandingBalance,
    required this.overdueAmount,
    required this.paymentStatus,
    this.nextDueDate,
    this.lastPaymentDate,
    this.lastReceiptNumber,
    this.currency,
  });

  String get currencySymbol => currency?.symbol ?? '₹';

  factory FeeSummary.fromJson(Map<String, dynamic> json) {
    return FeeSummary(
      totalFees: SafeConvert.toSafeDouble(json['total_fees']),
      totalPaid: SafeConvert.toSafeDouble(json['total_paid']),
      outstandingBalance: SafeConvert.toSafeDouble(json['outstanding_balance']),
      overdueAmount: SafeConvert.toSafeDouble(json['overdue_amount']),
      paymentStatus: SafeConvert.toSafeString(json['payment_status'], 'no_dues'),
      nextDueDate: SafeConvert.toNullableString(json['next_due_date']),
      lastPaymentDate: SafeConvert.toNullableString(json['last_payment_date']),
      lastReceiptNumber: SafeConvert.toNullableString(json['last_receipt_number']),
      currency: CurrencyInfo.fromNullableJson(json['currency']),
    );
  }
}

class DashboardFeeSummary {
  final double totalFees;
  final double totalPaid;
  final double outstandingBalance;
  final double overdueAmount;
  final String paymentStatus;
  final String? nextDueDate;
  final String currencySymbol;

  const DashboardFeeSummary({
    required this.totalFees,
    required this.totalPaid,
    required this.outstandingBalance,
    required this.overdueAmount,
    required this.paymentStatus,
    this.nextDueDate,
    this.currencySymbol = '₹',
  });

  factory DashboardFeeSummary.fromJson(Map<String, dynamic> json) {
    return DashboardFeeSummary(
      totalFees: SafeConvert.toSafeDouble(json['total_fees']),
      totalPaid: SafeConvert.toSafeDouble(json['total_paid']),
      outstandingBalance: SafeConvert.toSafeDouble(json['outstanding_balance']),
      overdueAmount: SafeConvert.toSafeDouble(json['overdue_amount']),
      paymentStatus: SafeConvert.toSafeString(json['payment_status'], 'no_dues'),
      nextDueDate: SafeConvert.toNullableString(json['next_due_date']),
      currencySymbol: SafeConvert.toSafeString(json['currency_symbol'], '₹'),
    );
  }
}

class FeeInvoiceLine {
  final int id;
  final String name;
  final String? category;
  final double amount;
  final bool mandatory;

  const FeeInvoiceLine({
    required this.id,
    required this.name,
    this.category,
    required this.amount,
    required this.mandatory,
  });

  factory FeeInvoiceLine.fromJson(Map<String, dynamic> json) {
    return FeeInvoiceLine(
      id: SafeConvert.toSafeInt(json['id']),
      name: SafeConvert.toSafeString(json['name']),
      category: SafeConvert.toNullableString(json['category']),
      amount: SafeConvert.toSafeDouble(json['amount']),
      mandatory: SafeConvert.toSafeBool(json['mandatory'], true),
    );
  }
}

class FeeInvoicePayment {
  final int id;
  final String receiptNumber;
  final String? paymentDate;
  final String? paymentMethod;
  final String? paymentMethodLabel;
  final double amount;
  final String? referenceNumber;

  const FeeInvoicePayment({
    required this.id,
    required this.receiptNumber,
    this.paymentDate,
    this.paymentMethod,
    this.paymentMethodLabel,
    required this.amount,
    this.referenceNumber,
  });

  factory FeeInvoicePayment.fromJson(Map<String, dynamic> json) {
    return FeeInvoicePayment(
      id: SafeConvert.toSafeInt(json['id']),
      receiptNumber: SafeConvert.toSafeString(json['receipt_number']),
      paymentDate: SafeConvert.toNullableString(json['payment_date']),
      paymentMethod: SafeConvert.toNullableString(json['payment_method']),
      paymentMethodLabel: SafeConvert.toNullableString(json['payment_method_label']),
      amount: SafeConvert.toSafeDouble(json['amount']),
      referenceNumber: SafeConvert.toNullableString(json['reference_number']),
    );
  }
}

class FeeInvoice {
  final int id;
  final String invoiceNumber;
  final String title;
  final NamedRecord? academicYear;
  final NamedRecord? academicTerm;
  final NamedRecord? semester;
  final String? assignmentDate;
  final String? dueDate;
  final double amount;
  final double amountPaid;
  final double amountDue;
  final String paymentStatus;
  final String state;
  final CurrencyInfo? currency;
  final List<FeeInvoiceLine> lines;
  final List<FeeInvoicePayment> payments;

  const FeeInvoice({
    required this.id,
    required this.invoiceNumber,
    required this.title,
    this.academicYear,
    this.academicTerm,
    this.semester,
    this.assignmentDate,
    this.dueDate,
    required this.amount,
    required this.amountPaid,
    required this.amountDue,
    required this.paymentStatus,
    required this.state,
    this.currency,
    this.lines = const [],
    this.payments = const [],
  });

  String get currencySymbol => currency?.symbol ?? '₹';

  bool get isOverdue => paymentStatus == 'overdue';
  bool get isPaid => paymentStatus == 'paid';
  bool get isPartial => paymentStatus == 'partial';

  factory FeeInvoice.fromJson(Map<String, dynamic> json) {
    return FeeInvoice(
      id: SafeConvert.toSafeInt(json['id']),
      invoiceNumber: SafeConvert.toSafeString(json['invoice_number']),
      title: SafeConvert.toSafeString(json['title']),
      academicYear: NamedRecord.fromNullableJson(json['academic_year']),
      academicTerm: NamedRecord.fromNullableJson(json['academic_term']),
      semester: NamedRecord.fromNullableJson(json['semester']),
      assignmentDate: SafeConvert.toNullableString(json['assignment_date']),
      dueDate: SafeConvert.toNullableString(json['due_date']),
      amount: SafeConvert.toSafeDouble(json['amount']),
      amountPaid: SafeConvert.toSafeDouble(json['amount_paid']),
      amountDue: SafeConvert.toSafeDouble(json['amount_due']),
      paymentStatus: SafeConvert.toSafeString(json['payment_status'], 'unpaid'),
      state: SafeConvert.toSafeString(json['state'], 'draft'),
      currency: CurrencyInfo.fromNullableJson(json['currency']),
      lines: SafeConvert.toSafeList(
        json['lines'],
        (item) => FeeInvoiceLine.fromJson(SafeConvert.toNullableMap(item) ?? {}),
      ),
      payments: SafeConvert.toSafeList(
        json['payments'],
        (item) => FeeInvoicePayment.fromJson(SafeConvert.toNullableMap(item) ?? {}),
      ),
    );
  }
}

class FeePayment {
  final int id;
  final String receiptNumber;
  final String? paymentDate;
  final String? paymentMethod;
  final String paymentMethodLabel;
  final double amount;
  final String? referenceNumber;
  final String? remarks;
  final String status;
  final int? invoiceId;
  final String? invoiceNumber;
  final CurrencyInfo? currency;

  const FeePayment({
    required this.id,
    required this.receiptNumber,
    this.paymentDate,
    this.paymentMethod,
    required this.paymentMethodLabel,
    required this.amount,
    this.referenceNumber,
    this.remarks,
    required this.status,
    this.invoiceId,
    this.invoiceNumber,
    this.currency,
  });

  String get currencySymbol => currency?.symbol ?? '₹';

  factory FeePayment.fromJson(Map<String, dynamic> json) {
    final invoiceMap = SafeConvert.toNullableMap(json['invoice']);
    return FeePayment(
      id: SafeConvert.toSafeInt(json['id']),
      receiptNumber: SafeConvert.toSafeString(json['receipt_number']),
      paymentDate: SafeConvert.toNullableString(json['payment_date']),
      paymentMethod: SafeConvert.toNullableString(json['payment_method']),
      paymentMethodLabel: SafeConvert.toSafeString(json['payment_method_label'], 'Payment'),
      amount: SafeConvert.toSafeDouble(json['amount']),
      referenceNumber: SafeConvert.toNullableString(json['reference_number']),
      remarks: SafeConvert.toNullableString(json['remarks']),
      status: SafeConvert.toSafeString(json['status'], 'confirmed'),
      invoiceId: invoiceMap != null ? SafeConvert.toNullableInt(invoiceMap['id']) : null,
      invoiceNumber: invoiceMap != null ? SafeConvert.toNullableString(invoiceMap['invoice_number']) : null,
      currency: CurrencyInfo.fromNullableJson(json['currency']),
    );
  }
}