using System.Collections.Generic;
using UnityEngine;

namespace Rokojori
{

public class GameStateManager : MonoBehaviour
{
  public static GameStateManager instance => Unique<GameStateManager>.Get();

  public List<GameStateVariable> variables = new List<GameStateVariable>();

  [System.NonSerialized]
  public Dictionary<GameStateNumberVariable, double> _numberValues = new Dictionary<GameStateNumberVariable, double>();

  [System.NonSerialized]
  public Dictionary<GameStateBoolVariable, bool> _boolValues = new Dictionary<GameStateBoolVariable, bool>();

  public void Awake()
  {
    _numberValues.Clear();
    _boolValues.Clear();

    variables.ForEach( v =>
    {
      if ( v is GameStateNumberVariable numberVariable )
      {
        _numberValues[ numberVariable ] = numberVariable.initialValue;
      }
      else if ( v is GameStateBoolVariable boolVariable )
      {
        _boolValues[ boolVariable ] = boolVariable.initialValue;
      }
    } );
  }

  public double GetValue( GameStateNumberVariable variable )
  {
    return _numberValues.TryGetValue( variable, out var value ) ? value : variable.initialValue;
  }

  public bool GetValue( GameStateBoolVariable variable )
  {
    return _boolValues.TryGetValue( variable, out var value ) ? value : variable.initialValue;
  }

  public void SetValue( GameStateNumberVariable variable, double value )
  {
    _numberValues[ variable ] = value;
    variable.onChanged.DispatchEvent( value );
  }

  public void SetValue( GameStateBoolVariable variable, bool value )
  {
    _boolValues[ variable ] = value;
    variable.onChanged.DispatchEvent( value );
  }

  [System.Serializable]
  public class NumberEntry
  {
    public string key = "";
    public double value = 0;
  }

  [System.Serializable]
  public class BoolEntry
  {
    public string key = "";
    public bool value = false;
  }

  [System.Serializable]
  public class SaveData
  {
    public List<NumberEntry> numbers = new List<NumberEntry>();
    public List<BoolEntry> bools = new List<BoolEntry>();
  }

  public string ToJson()
  {
    var data = new SaveData();

    foreach ( var pair in _numberValues )
    {
      data.numbers.Add( new NumberEntry{ key = pair.Key.key, value = pair.Value } );
    }

    foreach ( var pair in _boolValues )
    {
      data.bools.Add( new BoolEntry{ key = pair.Key.key, value = pair.Value } );
    }

    return JsonUtility.ToJson( data );
  }

  public void FromJson( string json )
  {
    var data = JsonUtility.FromJson<SaveData>( json );

    data.numbers.ForEach( entry =>
    {
      var variable = variables.Find( v => v is GameStateNumberVariable n && n.key == entry.key ) as GameStateNumberVariable;

      if ( variable != null )
      {
        SetValue( variable, entry.value );
      }
    } );

    data.bools.ForEach( entry =>
    {
      var variable = variables.Find( v => v is GameStateBoolVariable b && b.key == entry.key ) as GameStateBoolVariable;

      if ( variable != null )
      {
        SetValue( variable, entry.value );
      }
    } );
  }
}

}