import 'dart:developer';

import 'package:flutter/foundation.dart';

import '../constants/model_keys.dart';
import 'lemma.dart';

class PangeaToken {
  PangeaTokenText text;
  Lemma lemma;

  /// [pos] ex "VERB" - part of speech of the token
  /// https://universaldependencies.org/u/pos/
  final String pos;

  /// [morph] ex {} - morphological features of the token
  /// https://universaldependencies.org/u/feat/
  final Map<String, dynamic> morph;

  PangeaToken({
    required this.text,
    required this.lemma,
    required this.pos,
    required this.morph,
  });

  static Lemma _getLemmas(String text, dynamic json) {
    if (json != null) {
      // July 24, 2024 - we're changing from a list to a single lemma and this is for backwards compatibility
      // previously sent tokens have lists of lemmas
      if (json is Iterable) {
        return json
                .map<Lemma>(
                  (e) => Lemma.fromJson(e as Map<String, dynamic>),
                )
                .toList()
                .cast<Lemma>()
                .firstOrNull ??
            Lemma(text: text, saveVocab: false, form: text);
      } else {
        return Lemma.fromJson(json);
      }
    } else {
      // earlier still, we didn't have lemmas so this is for really old tokens
      return Lemma(text: text, saveVocab: false, form: text);
    }
  }

  factory PangeaToken.fromJson(Map<String, dynamic> json) {
    final PangeaTokenText text =
        PangeaTokenText.fromJson(json[_textKey] as Map<String, dynamic>);
    return PangeaToken(
      text: text,
      lemma: _getLemmas(text.content, json[_lemmaKey]),
      pos: json['pos'] ?? '',
      morph: json['morph'] ?? {},
    );
  }

  static const String _textKey = "text";
  static const String _lemmaKey = ModelKey.lemma;

  Map<String, dynamic> toJson() => {
        _textKey: text.toJson(),
        _lemmaKey: lemma.toJson(),
        'pos': pos,
        'morph': morph,
      };

  int get end => text.offset + text.length;
}

class PangeaTokenText {
  int offset;
  String content;
  int length;

  PangeaTokenText({
    required this.offset,
    required this.content,
    required this.length,
  });

  factory PangeaTokenText.fromJson(Map<String, dynamic> json) {
    debugger(when: kDebugMode && json[_offsetKey] == null);
    return PangeaTokenText(
      offset: json[_offsetKey],
      content: json[_contentKey],
      length: json[_lengthKey] ?? (json[_contentKey] as String).length,
    );
  }

  static const String _offsetKey = "offset";
  static const String _contentKey = "content";
  static const String _lengthKey = "length";

  Map<String, dynamic> toJson() =>
      {_offsetKey: offset, _contentKey: content, _lengthKey: length};
}