using Godot;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Babushka.scripts.CSharp.Common.Quest;

using QuestPair = KeyValuePair<QuestResource, QuestStatus>;
public partial class QuestManager : Node
{
    public static QuestManager? Instance { get; private set; }

    [Signal]
    public delegate void QuestBecomesAvailableEventHandler(QuestResource questResource);

    [Signal]
    public delegate void QuestsChangedEventHandler();

    [Signal]
    public delegate void DialogicActiveQuestEventHandler(string value);

    public override void _EnterTree()
    {
        Instance = this;
    }

    private Godot.Collections.Dictionary<QuestResource, QuestStatus> _questStatus = new();

    private QuestResource? _activeQuest;


    public void ChangeQuestStatus(QuestResource questResource, QuestStatus.Status newStatus)
    {
        if (!_questStatus.TryGetValue(questResource, out var value))
        {
            value = new QuestStatus();
            _questStatus.Add(questResource, value);
        }

        value.status = newStatus;

        EmitSignalQuestsChanged();
        EmitSignalDialogicActiveQuest(_activeQuest?.id ?? "none");

        if (newStatus == QuestStatus.Status.Available)
        {
            EmitSignalQuestBecomesAvailable(questResource);
        }
    }

    public IEnumerable<QuestPair> GetVisibleQuests()
    {
        return _questStatus.Where(qs => qs.Value.status != QuestStatus.Status.Hidden);
    }

    public IEnumerable<QuestPair> GetAvailableQuests()
    {
        return _questStatus.Where(qs => qs.Value.status == QuestStatus.Status.Available);
    }
    public QuestStatus GetQuestStatus(QuestResource questResource)
    {
        if (_questStatus.TryGetValue(questResource, out var status))
            return status;

        status = new QuestStatus();
        _questStatus.Add(questResource, status);
        return status;
    }

    public QuestResource? GetActiveQuest()
    {
        return _activeQuest;
    }

    public void SetActiveQuest(QuestResource? questResource)
    {
        _activeQuest = questResource;
        EmitSignalQuestsChanged();
        EmitSignalDialogicActiveQuest(_activeQuest?.id ?? "none");
    }
}