import 'package:body_detection/models/pose_landmark_type.dart';

import '../../../navigation/utils/geometry_utils.dart';
import '../widgets/pose_detector.dart';

enum AuthorizedTypeIndex {
  nose,
  leftShoulder,
  rightShoulder,
  leftElbow,
  rightElbow,
  leftWrist,
  rightWrist,
  leftHip,
  rightHip,
  leftKnee,
  rightKnee,
  leftAnkle,
  rightAnkle,
}

AuthorizedTypeIndex typeIndexFromString(String typeIndex) {
  switch (typeIndex) {
    case "nose":
      return AuthorizedTypeIndex.nose;
    case "leftShoulder":
      return AuthorizedTypeIndex.leftShoulder;
    case "rightShoulder":
      return AuthorizedTypeIndex.rightShoulder;
    case "leftElbow":
      return AuthorizedTypeIndex.leftElbow;
    case "rightElbow":
      return AuthorizedTypeIndex.rightElbow;
    case "leftWrist":
      return AuthorizedTypeIndex.leftWrist;
    case "rightWrist":
      return AuthorizedTypeIndex.rightWrist;
    case "leftHip":
      return AuthorizedTypeIndex.leftHip;
    case "rightHip":
      return AuthorizedTypeIndex.rightHip;
    case "leftKnee":
      return AuthorizedTypeIndex.leftKnee;
    case "rightKnee":
      return AuthorizedTypeIndex.rightKnee;
    case "leftAnkle":
      return AuthorizedTypeIndex.leftAnkle;
    case "rightAnkle":
      return AuthorizedTypeIndex.rightAnkle;
    default:
      throw const FormatException("Incorrect type name");
  }
}

enum Comparator {
  greater,
  lesser,
}

Comparator comparatorFromString(String comparator) {
  switch (comparator) {
    case "greater":
      return Comparator.greater;
    case "lesser":
      return Comparator.lesser;
    default:
      throw const FormatException("Incorrect comparator name");
  }
}

class Exercise {
  final int repetitions;
  final int sets;
  final Criteria? startMovement;
  final Criteria? endMovement;
  final String description;
  final String name;
  final int difficulty;
  final String id;
  late final List<PoseLandmarkType> jointsOnScreen;

  Exercise({
    required this.repetitions,
    required this.sets,
    required this.startMovement,
    required this.endMovement,
    required this.description,
    required this.name,
    required this.difficulty,
    required this.id,
    required List<AuthorizedTypeIndex> jointsOnScreen,
  }) {
    this.jointsOnScreen = jointsOnScreen.map((joint) => authorizedType[joint.index]).toList();
  }

  bool isAtStartMovement(MeanFilteredData meanFilteredData) {
    final start = startMovement;
    if (start != null) {
      return start.isAtPosition(meanFilteredData);
    }
    return false;
  }

  bool isAtEndMovement(MeanFilteredData meanFilteredData) {
    final end = endMovement;
    if (end != null) {
      return end.isAtPosition(meanFilteredData);
    }
    return false;
  }

  Map<String, dynamic> toMap() {
    return {
      "repetitions": repetitions,
      "sets": sets,
      "start_movement": startMovement?.toMap(),
      "end_movement": endMovement?.toMap(),
      "description": description,
      "name": name,
      "difficulty": difficulty,
      "joints_on_screen": jointsOnScreen.map((j) => j.name).toList(),
    };
  }

  factory Exercise.fromMap(String id, Map<String, dynamic> map) {
    return Exercise(
      repetitions: map["repetitions"],
      sets: map["sets"],
      startMovement: map.containsKey("start_movement") ? Criteria.fromMap(map["start_movement"]) : null,
      endMovement: map.containsKey("end_movement") ? Criteria.fromMap(map["end_movement"]) : null,
      description: map["description"],
      name: map["name"],
      difficulty: map["difficulty"],
      id: id,
      jointsOnScreen: map.containsKey("joints_on_screen") ? List<String>.from(map["joints_on_screen"]).map((e) => typeIndexFromString(e)).toList() : [],
    );
  }

  static const authorizedType = [
    PoseLandmarkType.nose,
    PoseLandmarkType.leftShoulder,
    PoseLandmarkType.rightShoulder,
    PoseLandmarkType.leftElbow,
    PoseLandmarkType.rightElbow,
    PoseLandmarkType.leftWrist,
    PoseLandmarkType.rightWrist,
    PoseLandmarkType.leftHip,
    PoseLandmarkType.rightHip,
    PoseLandmarkType.leftKnee,
    PoseLandmarkType.rightKnee,
    PoseLandmarkType.leftAnkle,
    PoseLandmarkType.rightAnkle,
  ];
}

abstract class Criteria {
  bool isAtPosition(MeanFilteredData meanFilteredData);
  Map<String, dynamic> toMap();
  static Criteria fromMap(Map<String, dynamic> map) {
    switch (map["type"]) {
      case "distance":
        return CriteriaDistance.fromMap(map);
      case "angle":
        return CriteriaAngle.fromMap(map);
      default:
        throw FormatException("Type should be distance or angle but is ${map['type']}");
    }
  }
}

class CriteriaDistance implements Criteria {
  final AuthorizedTypeIndex jointStart;
  final AuthorizedTypeIndex jointEnd;
  final int axis;
  final num threshold;
  final Comparator comparator;

  const CriteriaDistance({
    required this.jointStart,
    required this.jointEnd,
    required this.axis,
    required this.threshold,
    required this.comparator,
  });

  @override
  bool isAtPosition(MeanFilteredData meanFilteredData) {
    final start = meanFilteredData[jointStart.index][axis];
    final end = meanFilteredData[jointEnd.index][axis];
    final distance = (start - end).abs();
    return _compare(distance, threshold);
  }

  bool _compare(num distance, num threshold) {
    if (comparator == Comparator.greater) {
      return distance > threshold;
    } else {
      return distance < threshold;
    }
  }

  @override
  Map<String, dynamic> toMap() {
    return {
      "joint_start": jointStart.name,
      "joint_end": jointEnd.name,
      "threshold": threshold,
      "comparator": comparator.name,
      "type": "distance",
    };
  }

  factory CriteriaDistance.fromMap(Map<String, dynamic> map) {
    return CriteriaDistance(
      jointStart: typeIndexFromString(map["joint_start"]),
      jointEnd: typeIndexFromString(map["joint_end"]),
      axis: map["axis"],
      threshold: map["threshold"],
      comparator: comparatorFromString(map["comparator"]),
    );
  }
}

class CriteriaAngle implements Criteria {
  final AuthorizedTypeIndex jointStart;
  final AuthorizedTypeIndex jointCenter;
  final AuthorizedTypeIndex jointEnd;
  final num threshold;
  final Comparator comparator;

  const CriteriaAngle({
    required this.jointStart,
    required this.jointCenter,
    required this.jointEnd,
    required this.threshold,
    required this.comparator,
  });

  @override
  bool isAtPosition(MeanFilteredData meanFilteredData) {
    final start = Point3D(
        x: meanFilteredData[jointStart.index][0],
        y: meanFilteredData[jointStart.index][1],
        z: meanFilteredData[jointStart.index][2]);
    final center = Point3D(
        x: meanFilteredData[jointCenter.index][0],
        y: meanFilteredData[jointCenter.index][1],
        z: meanFilteredData[jointCenter.index][2]);
    final end = Point3D(
        x: meanFilteredData[jointEnd.index][0],
        y: meanFilteredData[jointEnd.index][1],
        z: meanFilteredData[jointEnd.index][2]);
    final angle = DistanceUtils.angleBetweenThreePoints(start, center, end).round();
    return _compare(angle, threshold);
  }

  bool _compare(num angle, num threshold) {
    if (comparator == Comparator.greater) {
      return angle > threshold;
    } else {
      return angle < threshold;
    }
  }

  @override
  Map<String, dynamic> toMap() {
    return {
      "joint_start": jointStart.name,
      "joint_center": jointCenter.name,
      "joint_end": jointEnd.name,
      "threshold": threshold,
      "comparator": comparator.name,
      "type": "angle",
    };
  }

  factory CriteriaAngle.fromMap(Map<String, dynamic> map) {
    return CriteriaAngle(
      jointStart: typeIndexFromString(map["joint_start"]),
      jointCenter: typeIndexFromString(map["joint_center"]),
      jointEnd: typeIndexFromString(map["joint_end"]),
      threshold: map["threshold"],
      comparator: comparatorFromString(map["comparator"]),
    );
  }
}