PIBD-14_Boyko_M_S_Cursach_DFS/Cursach/States/StatesStorage.cs

using Cursach.Realisations;
using ProtoBuf;

namespace Cursach.States;

public class StatesStorage
{
    List<State> states = [];
    public int Count => states.Count;
    public int CurrentStateIndex { get; private set; } = 0;

    public bool NextState()
    {
        CurrentStateIndex += 1;
        if (CurrentStateIndex >= Count)
        {
            CurrentStateIndex = Count - 1;
            return false;
        }

        return true;
    }

    public bool PrevState()
    {
        CurrentStateIndex -= 1;
        if (CurrentStateIndex < 0)
        {
            CurrentStateIndex = 0;
            return false;
        }

        return true;
    }

    public State? GetCurrentState()
    {
        return GetState(CurrentStateIndex);
    }

    public bool AddState(State state)
    {
        states.Add(state);

        return true;
    }

    public State? GetState(int index)
    {
        if (index >= 0 && index < states.Count)
        {
            return states[index];
        }

        return null;
    }

    public State? GoToFirstState()
    {
        if (states.Count != 0)
        {
            CurrentStateIndex = 0;
            return states[0];
        }
        return null;
    }
    public State? GetFirstState()
    {
        if (states.Count != 0)
        {
            return states[0];
        }

        return null;
    }

    public State? GetLastState()
    {
        if (states.Count != 0)
        {
            return states[Count - 1];
        }

        return null;
    }

    public bool SaveStateList(string filename)
    {
        try
        {
            using var file = File.Create(filename);
            Serializer.Serialize(file, new StateList(states));
            return true;
        }
        catch (Exception)
        {
            return false;
        }
    }

    public bool LoadStateList(string filename)
    {
        try
        {
            StateList tmpStates;
            using (var file = File.OpenRead(filename))
            {
                tmpStates = Serializer.Deserialize<StateList>(file);
                states = tmpStates.States;
                CurrentStateIndex = 0;
                return true;
            }
        }
        catch (Exception)
        {
            return false;
        }
    }

    public Node GetStartNode()
    {
        if (GetCurrentState().visited.Count == 0)
        {
            return GetCurrentState().queue.Last();
        }
        return GetCurrentState().visited[0];
    }
}