using System.Collections;
using AibisDream.Framework;
using UnityEngine;

namespace AibisDream.FixSystem
{
    /// <summary>
    /// Directs Fix scene mode transitions. This is a scene cue board, not a gameplay state machine:
    /// cues orchestrate cameras, timelines, UI masks, bubbles and interaction setup.
    /// </summary>
    public class FixSceneDirector
    {
        public FixSceneMode CurrentMode { get; private set; }
        public string CurrentArgs { get; private set; } = "";
        public bool HasMode { get; private set; }
        public bool IsTransitioning { get; private set; }

        private IFixSceneCue _currentCue;

        public IEnumerator Init(FixSceneMode initMode)
        {
            yield return TransitionInternal(initMode, "", FixTransitionMode.Immediate);
        }

        public IEnumerator TransitionTo(FixSceneMode nextMode, string args = "")
        {
            yield return TransitionInternal(nextMode, args, FixTransitionMode.Animated);
        }

        public IEnumerator TransitionToImmediate(FixSceneMode nextMode, string args = "")
        {
            yield return TransitionInternal(nextMode, args, FixTransitionMode.Immediate);
        }

        public IEnumerator QuitCurrentMode()
        {
            if (_currentCue != null)
            {
                var transition = new FixTransition(CurrentMode, FixSceneMode.Default, "", FixTransitionMode.Animated);
                yield return _currentCue.Exit(transition);
            }

            CurrentArgs = "";
            _currentCue = null;
            CurrentMode = FixSceneMode.Default;
            HasMode = false;
            IsTransitioning = false;
        }

        /// <summary>
        /// Clears director state without running cue exits. Used while the owning scene is
        /// being destroyed, when cue dependencies may already have been torn down.
        /// </summary>
        public void Reset()
        {
            CurrentArgs = "";
            _currentCue = null;
            CurrentMode = FixSceneMode.Default;
            HasMode = false;
            IsTransitioning = false;
        }

        private IEnumerator TransitionInternal(FixSceneMode nextMode, string args, FixTransitionMode mode)
        {
            if (IsTransitioning && mode == FixTransitionMode.Animated)
            {
                Debug.LogWarning($"[FixSceneDirector] Transition ignored while another transition is running: {CurrentMode} -> {nextMode}");
                yield break;
            }

            if (HasMode && CurrentMode.Equals(nextMode))
            {
                yield break;
            }

            IsTransitioning = true;

            var transition = new FixTransition(HasMode ? CurrentMode : null, nextMode, args, mode);

            if (mode == FixTransitionMode.Animated && _currentCue != null)
            {
                yield return _currentCue.Exit(transition);
            }

            _currentCue = CreateCue(nextMode);
            CurrentMode = nextMode;
            CurrentArgs = args ?? "";
            HasMode = true;

            EnumEventSystem.Global.Send(EventEnum.FixSceneModeChanged, nextMode);

            if (mode == FixTransitionMode.Immediate)
            {
                yield return _currentCue.EnterImmediate(transition);
            }
            else
            {
                yield return _currentCue.Enter(transition);
            }

            IsTransitioning = false;
        }

        private static IFixSceneCue CreateCue(FixSceneMode nextMode)
        {
            return nextMode switch
            {
                FixSceneMode.Default => new DefaultCue(),
                FixSceneMode.Clinic => new ClinicCue(),
                FixSceneMode.BodyModule => new BodyModuleCue(),
                FixSceneMode.Memory => new MemoryCue(),
                FixSceneMode.Eye => new EyeCue(),
                FixSceneMode.UF => new UfCue(),
                FixSceneMode.Expression => new ExpressionCue(),
                FixSceneMode.Emo => new EmoCue(),
                FixSceneMode.Op => new OpCue(),
                FixSceneMode.EmoCut => new EmoCutCue(),
                FixSceneMode.MemoryCut => new MemoryCutCue(),
                FixSceneMode.LogicCut => new LogicCutCue(),
                FixSceneMode.Dream => new DreamCue(),
                FixSceneMode.AnalysisMode => new AnalysisModeCue(),
                FixSceneMode.Sales => new SalesCue(),
                FixSceneMode.BlockPuzzle => new BlockPuzzleCue(),
                _ => new DefaultCue()
            };
        }
    }
}