class DocumentModel {
  final String id;
  final String tanggal;
  final String noPo;
  final String noSo;
  final String noDo;
  final String kepadaYth;
  final String orderUntuk;
  final String alamat;
  final String platTruk;
  final String namaDriver;
  final String namaPenerima;
  final double? latitude;
  final double? longitude;
  final List<DocumentItem> items;
  final DateTime createdAt;
  final bool parsed;

  /// 'pending' | 'done' | 'failed', sourced from the backend's `parseStatus`
  /// (backend task 9.1, `document-mapper.ts`) - only populated by
  /// `GET /api/v1/documents/:id` (see `pending_documents_provider.dart`'s
  /// `_pollUntilParsed`, which polls that route instead of scanning the
  /// whole list). Null for responses that don't include it (e.g. the PUT
  /// route's own hand-built response, or cached Hive rows).
  final String? parseStatus;

  /// 'DO' or 'Product', sourced from the backend's persisted `scan_mode`
  /// column (see backend task 9.1, `document-mapper.ts`'s `docType`) - the
  /// real replacement for the `orderUntuk == 'PRODUCT SCAN'` sentinel that
  /// every call site used to check (editing that display field used to
  /// silently move a document between tabs).
  final String docType;

  /// True once the user has confirmed this document (`PUT /documents/:id`),
  /// sourced from the backend's `confirmed` column (backend task 10.1) -
  /// separates "OCR finished" (`parsed`) from "user confirmed," since a
  /// document only re-enters `GET /api/v1/documents` (and this field is only
  /// meaningfully `false`) once confirmed. Defaults to `true` for
  /// legacy/cached responses that predate the column - see
  /// docs/api-contract-map.md G11.
  final bool confirmed;

  /// Top-5 SKU candidates from the single classify+OCR pass the backend runs
  /// at upload time for Product Scan documents (backend task on gap G3,
  /// `document-mapper.ts`'s `productScan.possibleMatches`) - lets the product
  /// editor render immediately instead of re-running the GPU pipeline a
  /// second time on review. Empty for DO documents, or Product documents
  /// parsed before this existed (already-confirmed docs also lose it, since
  /// it's only needed during the initial review).
  final List<Map<String, dynamic>> productScanMatches;

  /// OCR-extracted expiry date from that same single pass
  /// (`productScan.extractedExpiryDate`). Empty string when absent/not found.
  final String productScanExtractedExpiryDate;

  DocumentModel({
    required this.id,
    required this.tanggal,
    required this.noPo,
    required this.noSo,
    required this.noDo,
    required this.kepadaYth,
    required this.orderUntuk,
    required this.alamat,
    required this.platTruk,
    required this.namaDriver,
    required this.namaPenerima,
    this.latitude,
    this.longitude,
    required this.items,
    required this.createdAt,
    this.parsed = false,
    this.parseStatus,
    this.docType = 'DO',
    this.confirmed = true,
    this.productScanMatches = const [],
    this.productScanExtractedExpiryDate = '',
  });

  factory DocumentModel.fromJson(Map<String, dynamic> json) {
    var header = json['header'] ?? {};
    var shipment = json['shipment'] ?? {};
    var itemsList = json['items'] as List? ?? [];

    return DocumentModel(
      id: json['id'] ?? DateTime.now().millisecondsSinceEpoch.toString(),
      tanggal: header['tanggal']?.toString() ?? '',
      noPo: header['no_po']?.toString() ?? '',
      noSo: header['no_so']?.toString() ?? '',
      noDo: header['no_do']?.toString() ?? '',
      kepadaYth: shipment['kepada_yth']?.toString() ?? '',
      orderUntuk: shipment['order_untuk']?.toString() ?? '',
      alamat: shipment['alamat']?.toString() ?? '',
      platTruk: shipment['plat_truk']?.toString() ?? '',
      namaDriver: json['nama_driver']?.toString() ?? shipment['nama_driver']?.toString() ?? '',
      namaPenerima: json['nama_penerima']?.toString() ?? shipment['nama_penerima']?.toString() ?? '',
      latitude: json['latitude'] != null ? double.tryParse(json['latitude'].toString()) : null,
      longitude: json['longitude'] != null ? double.tryParse(json['longitude'].toString()) : null,
      items: itemsList.map((e) => DocumentItem.fromJson(Map<String, dynamic>.from(e))).toList(),
      createdAt: json['created_at'] != null
          ? DateTime.parse(json['created_at'].toString())
          : (json['createdAt'] != null ? DateTime.parse(json['createdAt'].toString()) : DateTime.now()),
      parsed: json['parsed'] as bool? ?? false,
      parseStatus: json['parseStatus']?.toString(),
      // Prefer the backend's persisted docType (backend task 9.1). Fall back
      // to the legacy orderUntuk sentinel for responses/cached rows that
      // predate that column (e.g. the upload endpoint's fresh-upload stub,
      // or Hive entries saved before this field existed) - mirrors the same
      // fallback backend/pfm-web-app/src/utils/document-mapper.ts uses.
      docType: json['docType']?.toString() ??
          (shipment['order_untuk'] == 'PRODUCT SCAN' ? 'Product' : 'DO'),
      confirmed: json['confirmed'] as bool? ?? true,
      productScanMatches: ((json['productScan'] as Map<String, dynamic>?)?['possibleMatches'] as List?)
              ?.map((e) => Map<String, dynamic>.from(e as Map))
              .toList() ??
          const [],
      productScanExtractedExpiryDate:
          (json['productScan'] as Map<String, dynamic>?)?['extractedExpiryDate']?.toString() ?? '',
    );
  }

  /// Round-trips with [fromJson]. Used to persist a document to Hive, both for
  /// the confirmed-documents box and the in-flight pending-documents queue.
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'created_at': createdAt.toIso8601String(),
      'latitude': latitude,
      'longitude': longitude,
      'nama_driver': namaDriver,
      'nama_penerima': namaPenerima,
      'parsed': parsed,
      'docType': docType,
      'header': {
        'tanggal': tanggal,
        'no_po': noPo,
        'no_so': noSo,
        'no_do': noDo,
      },
      'shipment': {
        'kepada_yth': kepadaYth,
        'order_untuk': orderUntuk,
        'alamat': alamat,
        'plat_truk': platTruk,
      },
      'items': items.map((e) => <String, dynamic>{
        'nomor_sku': e.nomorSku,
        'nama_barang': e.namaBarang,
        'banyak': e.banyak,
        'jumlah': e.jumlah,
      }).toList(),
    };
  }

  /// Body for `PUT /api/v1/documents/:id`. Shared by the editor's initial save and
  /// the pending-queue's sync retry so both send an identical payload shape.
  Map<String, dynamic> toPutPayload() {
    return {
      'tanggal': tanggal,
      'noPo': noPo,
      'noSo': noSo,
      'noDo': noDo,
      'kepadaYth': kepadaYth,
      'orderUntuk': orderUntuk,
      'alamat': alamat,
      'platTruk': platTruk,
      'namaDriver': namaDriver,
      'namaPenerima': namaPenerima,
      'latitude': latitude,
      'longitude': longitude,
      'items': items.map((e) => <String, dynamic>{
        'nomor_sku': e.nomorSku,
        'nama_barang': e.namaBarang,
        'banyak': e.banyak,
        'jumlah': e.jumlah,
      }).toList(),
    };
  }
}

class DocumentItem {
  final String nomorSku;
  final String namaBarang;
  final String banyak;
  final String jumlah;

  DocumentItem({
    required this.nomorSku,
    required this.namaBarang,
    required this.banyak,
    required this.jumlah,
  });

  factory DocumentItem.fromJson(Map<String, dynamic> json) {
    return DocumentItem(
      nomorSku: json['nomor_sku']?.toString() ?? '',
      namaBarang: json['nama_barang']?.toString() ?? '',
      banyak: json['banyak']?.toString() ?? '',
      jumlah: json['jumlah']?.toString() ?? '',
    );
  }
}