add price policy

lib/features/price_policy/data/models/price_document_model.dart

@@ -0,0 +1,158 @@
+/// Data Model: Price Document Model
+///
+/// Data layer model for price policy documents.
+/// Handles JSON serialization and conversion to/from domain entity.
+library;
+
+import 'package:worker/features/price_policy/domain/entities/price_document.dart';
+
+/// Price Document Model
+///
+/// Used in the data layer for:
+/// - JSON serialization/deserialization from API
+/// - Conversion to domain entity
+/// - Local storage (if needed)
+class PriceDocumentModel {
+  /// Unique document ID
+  final String id;
+
+  /// Document title
+  final String title;
+
+  /// Document description
+  final String description;
+
+  /// Date the document was published (ISO 8601 string)
+  final String publishedDate;
+
+  /// Type of document (pdf or excel)
+  final String documentType;
+
+  /// Category (policy or priceList)
+  final String category;
+
+  /// URL to download the document
+  final String downloadUrl;
+
+  /// Optional file size display string
+  final String? fileSize;
+
+  /// Constructor
+  const PriceDocumentModel({
+    required this.id,
+    required this.title,
+    required this.description,
+    required this.publishedDate,
+    required this.documentType,
+    required this.category,
+    required this.downloadUrl,
+    this.fileSize,
+  });
+
+  /// Create model from JSON
+  factory PriceDocumentModel.fromJson(Map<String, dynamic> json) {
+    return PriceDocumentModel(
+      id: json['id'] as String,
+      title: json['title'] as String,
+      description: json['description'] as String,
+      publishedDate: json['published_date'] as String,
+      documentType: json['document_type'] as String,
+      category: json['category'] as String,
+      downloadUrl: json['download_url'] as String,
+      fileSize: json['file_size'] as String?,
+    );
+  }
+
+  /// Convert model to JSON
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'title': title,
+      'description': description,
+      'published_date': publishedDate,
+      'document_type': documentType,
+      'category': category,
+      'download_url': downloadUrl,
+      'file_size': fileSize,
+    };
+  }
+
+  /// Convert model to domain entity
+  PriceDocument toEntity() {
+    return PriceDocument(
+      id: id,
+      title: title,
+      description: description,
+      publishedDate: DateTime.parse(publishedDate),
+      documentType: _parseDocumentType(documentType),
+      category: _parseCategory(category),
+      downloadUrl: downloadUrl,
+      fileSize: fileSize,
+    );
+  }
+
+  /// Create model from domain entity
+  factory PriceDocumentModel.fromEntity(PriceDocument entity) {
+    return PriceDocumentModel(
+      id: entity.id,
+      title: entity.title,
+      description: entity.description,
+      publishedDate: entity.publishedDate.toIso8601String(),
+      documentType: _documentTypeToString(entity.documentType),
+      category: _categoryToString(entity.category),
+      downloadUrl: entity.downloadUrl,
+      fileSize: entity.fileSize,
+    );
+  }
+
+  /// Parse document type from string
+  static DocumentType _parseDocumentType(String type) {
+    switch (type.toLowerCase()) {
+      case 'pdf':
+        return DocumentType.pdf;
+      case 'excel':
+        return DocumentType.excel;
+      default:
+        return DocumentType.pdf;
+    }
+  }
+
+  /// Parse category from string
+  static DocumentCategory _parseCategory(String category) {
+    switch (category.toLowerCase()) {
+      case 'policy':
+        return DocumentCategory.policy;
+      case 'pricelist':
+      case 'price_list':
+        return DocumentCategory.priceList;
+      default:
+        return DocumentCategory.policy;
+    }
+  }
+
+  /// Convert document type to string
+  static String _documentTypeToString(DocumentType type) {
+    switch (type) {
+      case DocumentType.pdf:
+        return 'pdf';
+      case DocumentType.excel:
+        return 'excel';
+    }
+  }
+
+  /// Convert category to string
+  static String _categoryToString(DocumentCategory category) {
+    switch (category) {
+      case DocumentCategory.policy:
+        return 'policy';
+      case DocumentCategory.priceList:
+        return 'priceList';
+    }
+  }
+
+  @override
+  String toString() {
+    return 'PriceDocumentModel(id: $id, title: $title, category: $category, '
+        'documentType: $documentType, publishedDate: $publishedDate)';
+  }
+}