using System.Reflection;
using HutongGames.PlayMaker;
using HutongGames.PlayMaker.Actions;
using MSCLoader;
using UnityEngine;

namespace MSCO
{
    /// <summary>Hilfsfunktionen rund um Hauptmenü und das Laden der Spielszene.</summary>
    public static class MenuHelper
    {
        public const string MenuScene = "MainMenu";
        public const string GameScene = "GAME";

        public static bool InMenu { get { return Application.loadedLevelName == MenuScene; } }
        public static bool InGame { get { return Application.loadedLevelName == GameScene; } }

        static readonly MethodInfo switchState =
            typeof(Fsm).GetMethod("SwitchState", BindingFlags.NonPublic | BindingFlags.Instance);

        /// <summary>
        /// Sucht im Hauptmenü die PlayMaker-FSM des CONTINUE-Buttons und den Zustand,
        /// der per LoadLevel die Szene "GAME" lädt.
        /// </summary>
        public static bool FindContinueLoadState(out PlayMakerFSM fsm, out FsmState state)
        {
            fsm = null;
            state = null;
            foreach (Object o in Object.FindObjectsOfType(typeof(PlayMakerFSM)))
            {
                var candidate = (PlayMakerFSM)o;
                if (!HierarchyContains(candidate.transform, "continue")) continue;

                foreach (FsmState s in candidate.FsmStates)
                {
                    if (!s.ActionsLoaded) s.LoadActions();
                    if (s.Actions == null) continue;
                    foreach (FsmStateAction action in s.Actions)
                    {
                        var load = action as LoadLevel;
                        if (load != null && load.levelName != null && load.levelName.Value == GameScene)
                        {
                            fsm = candidate;
                            state = s;
                            return true;
                        }
                    }
                }
            }
            return false;
        }

        /// <summary>Startet das Spiel wie ein Klick auf CONTINUE.</summary>
        public static void StartGame()
        {
            PlayMakerFSM fsm;
            FsmState state;
            if (switchState != null && FindContinueLoadState(out fsm, out state))
            {
                MscoLog.Info("[MSCO] Loading via CONTINUE (" + fsm.name + " / " + state.Name + ")");
                switchState.Invoke(fsm.Fsm, new object[] { state });
            }
            else
            {
                MscoLog.Warning("[MSCO] CONTINUE button not found, loading GAME directly");
                Application.LoadLevel(GameScene);
            }
        }

        static bool HierarchyContains(Transform t, string text)
        {
            for (; t != null; t = t.parent)
                if (t.name.ToLower().Contains(text)) return true;
            return false;
        }
    }
}