import 'dart:convert';
import 'package:drift/drift.dart';
import 'package:trainhub_flutter/data/database/app_database.dart';
import 'package:trainhub_flutter/domain/entities/training_plan.dart';
import 'package:trainhub_flutter/domain/entities/training_section.dart';
import 'package:trainhub_flutter/domain/entities/training_exercise.dart';

class TrainingPlanMapper {
  TrainingPlanMapper._();

  static TrainingPlanEntity toEntity(TrainingPlan row) {
    final List<dynamic> sectionsJson =
        row.sections != null && row.sections!.isNotEmpty
            ? jsonDecode(row.sections!) as List
            : [];
    return TrainingPlanEntity(
      id: row.id,
      name: row.name,
      sections: sectionsJson
          .map((s) => _mapSection(s as Map<String, dynamic>))
          .toList(),
    );
  }

  static TrainingSectionEntity _mapSection(Map<String, dynamic> json) {
    final exercisesJson = json['exercises'] as List<dynamic>? ?? [];
    return TrainingSectionEntity(
      id: json['id'] as String? ?? '',
      name: json['name'] as String? ?? '',
      exercises: exercisesJson
          .map((e) => _mapExercise(e as Map<String, dynamic>))
          .toList(),
    );
  }

  static TrainingExerciseEntity _mapExercise(Map<String, dynamic> json) {
    return TrainingExerciseEntity(
      instanceId: json['instanceId'] as String? ?? '',
      exerciseId: json['exerciseId'] as String? ?? '',
      name: json['name'] as String? ?? '',
      sets: json['sets'] as int? ?? 3,
      value: json['value'] as int? ?? 10,
      isTime: json['isTime'] as bool? ?? false,
      rest: json['rest'] as int? ?? 60,
    );
  }

  static String sectionsToJson(List<TrainingSectionEntity> sections) {
    return jsonEncode(sections.map((s) => _sectionToMap(s)).toList());
  }

  static Map<String, dynamic> _sectionToMap(TrainingSectionEntity section) {
    return {
      'id': section.id,
      'name': section.name,
      'exercises': section.exercises.map((e) => _exerciseToMap(e)).toList(),
    };
  }

  static Map<String, dynamic> _exerciseToMap(TrainingExerciseEntity exercise) {
    return {
      'instanceId': exercise.instanceId,
      'exerciseId': exercise.exerciseId,
      'name': exercise.name,
      'sets': exercise.sets,
      'value': exercise.value,
      'isTime': exercise.isTime,
      'rest': exercise.rest,
    };
  }

  static TrainingPlansCompanion toInsertCompanion(
      String id, String name) {
    return TrainingPlansCompanion.insert(
      id: id,
      name: name,
      sections: const Value('[]'),
    );
  }

  static TrainingPlansCompanion toUpdateCompanion(TrainingPlanEntity entity) {
    return TrainingPlansCompanion(
      name: Value(entity.name),
      sections: Value(sectionsToJson(entity.sections)),
    );
  }
}