using System.Collections;
using AibisDream.Kit;
using AibisDream.UI;
using AibisDream.Utility;
using DG.Tweening;
using UnityEngine;

namespace AibisDream
{
    public class DreamDoorSystem : Singleton<DreamDoorSystem>
    {
        [Header("Door Root")]
        [Tooltip("Door 根节点。默认仅 background 和 Frame 显示，整个 Door 初始隐藏。show_door 命令激活后显示。")]
        [SerializeField] private Transform doorRoot;

        [Header("Door Sprites")]
        [SerializeField] private SpriteRenderer glassSea;
        [SerializeField] private SpriteRenderer codeSea;
        [SerializeField] private SpriteRenderer flashOverlay;
        [Tooltip("仅放门的静态 background，不要把 glassSea/codeSea/overlay 拖进来。")]
        [SerializeField] private Renderer[] backgroundRenderers;
        [SerializeField] private Renderer[] frameRenderers;
        [SerializeField] private SpriteRenderer sceneBlackOverlay;

        [Header("Terminal（挂在 Door 子节点上即可，无需 Canvas）")]
        [SerializeField] private DreamTerminalUI terminalUI;

        [Header("Morph Settings")]
        [Tooltip("负责门壳贴合的节点；不填则退回到 doorRoot。")]
        [SerializeField] private Transform doorShellTransform;
        [Tooltip("线框先贴合的图片目标。建议拖一个 SpriteRenderer 作为参考形状。")]
        [SerializeField] private SpriteRenderer terminalShapeReference;
        [SerializeField] private Vector3 seaCollapseScale = new(0.9f, 0.84f, 1f);
        [SerializeField] private Vector3 doorSnapScale = new(0.95f, 1.06f, 1f);
        [SerializeField] private Ease morphEase = Ease.InOutCubic;
        [SerializeField] private FrameHidePhase frameHidePhase = FrameHidePhase.OnTerminal;
        [SerializeField] private float doorSnapDuration = 0.2f;
        [SerializeField] private float backgroundCutDelay = 0.04f;
        [SerializeField] private float preMorphHoldDuration = 0.16f;
        [SerializeField] private float postMorphBootDelay = 0.12f;
        [SerializeField] private float referenceSnapMorphProgress = 0.08f;
        [SerializeField] private Vector2 referenceSnapPadding = new(0.18f, 0.18f);
        [Tooltip("终端变形时 sceneBlackOverlay 淡入目标透明度（背景压暗）")]
        [SerializeField] private float blackoutAlpha = 0.92f;
        [Tooltip("黑场淡入时长（与终端 morph 并行）")]
        [SerializeField] private float blackoutFadeInDuration = 0.08f;
        [SerializeField] private float blackoutFadeOutDuration = 0.12f;

        private Transform _codeSeaTransform;
        private Vector3 _codeSeaOriginalScale;
        private Color _codeSeaOriginalColor;
        private Transform _terminalUiTransform;
        private Vector3 _terminalUiOriginalScale;
        private Vector3 _terminalUiOriginalLocalPosition;
        private Transform _doorShellTransform;
        private Vector3 _doorShellOriginalScale;

        private enum FrameHidePhase
        {
            Never,
            OnCodeSea,
            OnTerminal
        }

        public override void OnSingletonInit()
        {
            if (doorRoot != null)
                doorRoot.gameObject.SetActive(false);

            _doorShellTransform = doorShellTransform != null ? doorShellTransform : doorRoot;
            if (_doorShellTransform != null)
                _doorShellOriginalScale = _doorShellTransform.localScale;

            if (glassSea != null)
            {
                glassSea.SetAlpha(0);
                glassSea.gameObject.SetActive(false);
            }

            if (codeSea != null)
            {
                codeSea.SetAlpha(0);
                codeSea.gameObject.SetActive(false);
                _codeSeaTransform = codeSea.transform;
                _codeSeaOriginalScale = _codeSeaTransform.localScale;
                _codeSeaOriginalColor = codeSea.color;
            }

            if (flashOverlay != null)
            {
                flashOverlay.SetAlpha(0);
                flashOverlay.gameObject.SetActive(true);
            }

            if (sceneBlackOverlay != null)
            {
                sceneBlackOverlay.SetAlpha(0);
                sceneBlackOverlay.gameObject.SetActive(true);
            }

            if (terminalUI != null)
            {
                terminalUI.ResetVisualState();
                terminalUI.Alpha = 0f;
                _terminalUiTransform = terminalUI.transform;
                _terminalUiOriginalScale = _terminalUiTransform.localScale;
                _terminalUiOriginalLocalPosition = _terminalUiTransform.localPosition;
            }
        }

        /// <summary>
        /// 显示整个门（仅 background + Frame，GlassSea/CodeSea 保持隐藏直到各自命令调用）
        /// </summary>
        public IEnumerator ShowDoor(float duration = 0f)
        {
            if (doorRoot != null)
                doorRoot.gameObject.SetActive(true);

            SetBackgroundVisible(true);
            SetFrameVisible(true);
            ResetDoorShellScale();

            if (duration > 0f)
                yield return new WaitForSeconds(duration);
        }

        /// <summary>
        /// 隐藏整个门
        /// </summary>
        public void HideDoor()
        {
            if (doorRoot != null)
                doorRoot.gameObject.SetActive(false);
        }

        #region Phase 1: GlassSea 浮现

        public IEnumerator ShowGlassSea(float duration = 2f)
        {
            glassSea.gameObject.SetActive(true);
            yield return glassSea.DOFade(1f, duration)
                .SetEase(Ease.InOutSine)
                .WaitForCompletion();
        }

        public IEnumerator HideGlassSea(float duration = 1f)
        {
            yield return glassSea.DOFade(0f, duration)
                .SetEase(Ease.InOutSine)
                .WaitForCompletion();
            glassSea.gameObject.SetActive(false);
        }

        #endregion

        #region Phase 2: CodeSea 浮现 (GlassSea 交叉淡出)

        public IEnumerator ShowCodeSea(float duration = 2f)
        {
            codeSea.gameObject.SetActive(true);
            if (frameHidePhase == FrameHidePhase.OnCodeSea)
                SetFrameVisible(false);

            var seq = DOTween.Sequence();
            seq.Append(codeSea.DOFade(1f, duration).SetEase(Ease.InOutSine));
            if (glassSea != null && glassSea.gameObject.activeSelf)
            {
                seq.Join(glassSea.DOFade(0f, duration * 0.7f).SetEase(Ease.InSine));
            }

            yield return seq.WaitForCompletion();

            if (glassSea != null)
                glassSea.gameObject.SetActive(false);
        }

        #endregion

        #region Phase 3: CodeSea 变形为终端

        public IEnumerator ShowTerminal()
        {
            yield return AnimateDoorToTerminal();
            if (terminalUI != null)
            {
                if (postMorphBootDelay > 0f)
                    yield return new WaitForSeconds(postMorphBootDelay);
                terminalUI.Begin();
            }
        }

        private IEnumerator AnimateDoorToTerminal()
        {
            StopAllEffects();

            if (terminalUI != null)
            {
                terminalUI.ResetVisualState();
                terminalUI.MorphProgress = 0f;
                terminalUI.Alpha = 1f;
            }

            if (_terminalUiTransform != null)
            {
                _terminalUiTransform.localPosition = _terminalUiOriginalLocalPosition;
                _terminalUiTransform.localScale = _terminalUiOriginalScale;
            }

            SetBackgroundVisible(false);
            SetFrameVisible(false);

            if (glassSea != null)
                glassSea.gameObject.SetActive(false);

            if (codeSea != null)
                codeSea.gameObject.SetActive(false);

            if (flashOverlay != null)
                flashOverlay.SetAlpha(0f);

            if (sceneBlackOverlay != null)
            {
                sceneBlackOverlay.gameObject.SetActive(true);
                sceneBlackOverlay.SetAlpha(0f);
            }

            if (backgroundCutDelay > 0f)
                yield return new WaitForSeconds(backgroundCutDelay);

            if (preMorphHoldDuration > 0f)
                yield return new WaitForSeconds(preMorphHoldDuration);

            if (terminalUI != null)
            {
                float morph = 0f;
                var morphTween = DOTween.To(() => morph, v =>
                {
                    morph = v;
                    terminalUI.MorphProgress = v;
                }, 1f, 0.82f).SetEase(morphEase);

                if (sceneBlackOverlay != null)
                    sceneBlackOverlay.DOFade(blackoutAlpha, Mathf.Max(0.01f, blackoutFadeInDuration));

                yield return morphTween.WaitForCompletion();
            }

            ResetDoorShellScale();
        }

        #endregion

        #region 终端结局动效

        public IEnumerator PlayShutdownEffect()
        {
            var target = _terminalUiTransform != null ? _terminalUiTransform : _codeSeaTransform;
            if (target == null) yield break;

            var seq = DOTween.Sequence();

            if (flashOverlay != null)
                seq.Append(flashOverlay.DOFade(0.6f, 0.15f));

            // 压扁成白线
            float scaleY = _terminalUiTransform != null ? _terminalUiOriginalScale.y * 0.02f : 0.005f;
            seq.Join(target.DOScaleY(scaleY, 0.35f).SetEase(Ease.OutQuad));
            // 横向收缩消失
            seq.Append(target.DOScaleX(0f, 0.3f).SetEase(Ease.InQuad));

            if (flashOverlay != null)
                seq.Join(flashOverlay.DOFade(0f, 0.5f));

            yield return seq.WaitForCompletion();
        }

        public void PlayCrashEffect()
        {
            var target = _terminalUiTransform != null ? _terminalUiTransform : _codeSeaTransform;
            if (target != null)
                target.DOShakePosition(1.2f, 0.08f, 35, fadeOut: false);
        }

        public void StopAllEffects()
        {
            DOTween.Kill(_codeSeaTransform);
            DOTween.Kill(codeSea);
            DOTween.Kill(_terminalUiTransform);
            DOTween.Kill(_doorShellTransform);
            DOTween.Kill(flashOverlay);
            DOTween.Kill(sceneBlackOverlay);
        }

        #endregion

        #region 清理

        public void HideAll()
        {
            StopAllEffects();
            HideDoor();
            SetBackgroundVisible(true);
            SetFrameVisible(true);
            ResetDoorShellScale();

            if (glassSea != null)
            {
                glassSea.SetAlpha(0);
                glassSea.gameObject.SetActive(false);
            }

            if (codeSea != null)
            {
                codeSea.color = _codeSeaOriginalColor;
                codeSea.SetAlpha(0);
                codeSea.gameObject.SetActive(false);
                if (_codeSeaTransform != null)
                    _codeSeaTransform.localScale = _codeSeaOriginalScale;
            }

            if (terminalUI != null)
            {
                terminalUI.Alpha = 0f;
                terminalUI.ResetVisualState();
            }

            if (_terminalUiTransform != null)
            {
                _terminalUiTransform.localPosition = _terminalUiOriginalLocalPosition;
                _terminalUiTransform.localScale = _terminalUiOriginalScale;
            }

            if (flashOverlay != null)
                flashOverlay.SetAlpha(0);

            if (sceneBlackOverlay != null)
                sceneBlackOverlay.SetAlpha(0);
        }

        #endregion

        private void SetFrameVisible(bool visible)
        {
            if (frameRenderers == null) return;

            foreach (var frameRenderer in frameRenderers)
            {
                if (frameRenderer != null)
                    frameRenderer.enabled = visible;
            }
        }

        private void SetBackgroundVisible(bool visible)
        {
            if (backgroundRenderers == null) return;

            foreach (var backgroundRenderer in backgroundRenderers)
            {
                if (backgroundRenderer != null)
                    backgroundRenderer.enabled = visible;
            }
        }

        private void ResetDoorShellScale()
        {
            if (_doorShellTransform != null)
                _doorShellTransform.localScale = _doorShellOriginalScale;
        }

        private bool HasShapeReference()
        {
            return terminalShapeReference != null && terminalUI != null && _terminalUiTransform != null;
        }

        private void FitTerminalFrameToReference()
        {
            if (!HasShapeReference())
                return;

            var bounds = terminalShapeReference.bounds;
            var targetLocalPosition = _terminalUiTransform.parent != null
                ? _terminalUiTransform.parent.InverseTransformPoint(bounds.center)
                : bounds.center;

            _terminalUiTransform.localPosition = new Vector3(
                targetLocalPosition.x,
                targetLocalPosition.y,
                _terminalUiOriginalLocalPosition.z
            );

            Vector2 baseSize = terminalUI.EvaluateFrameSize(referenceSnapMorphProgress);
            float targetWidth = Mathf.Max(0.01f, bounds.size.x + referenceSnapPadding.x);
            float targetHeight = Mathf.Max(0.01f, bounds.size.y + referenceSnapPadding.y);

            Vector3 parentLossyScale = _terminalUiTransform.parent != null ? _terminalUiTransform.parent.lossyScale : Vector3.one;
            float parentScaleX = Mathf.Max(0.0001f, Mathf.Abs(parentLossyScale.x));
            float parentScaleY = Mathf.Max(0.0001f, Mathf.Abs(parentLossyScale.y));

            float localScaleX = targetWidth / Mathf.Max(0.0001f, baseSize.x * parentScaleX);
            float localScaleY = targetHeight / Mathf.Max(0.0001f, baseSize.y * parentScaleY);

            _terminalUiTransform.localScale = new Vector3(
                Mathf.Sign(_terminalUiOriginalScale.x) * localScaleX,
                Mathf.Sign(_terminalUiOriginalScale.y) * localScaleY,
                _terminalUiOriginalScale.z
            );
        }

#if UNITY_EDITOR
        private void OnDrawGizmosSelected()
        {
            if (codeSea == null) return;
            Gizmos.color = new Color(1f, 0.7f, 0f, 0.4f);
            var bounds = codeSea.bounds;
            Gizmos.DrawWireCube(bounds.center, bounds.size);

            if (terminalShapeReference != null)
            {
                Gizmos.color = new Color(1f, 1f, 1f, 0.45f);
                var referenceBounds = terminalShapeReference.bounds;
                Gizmos.DrawWireCube(referenceBounds.center, referenceBounds.size);
            }

            Gizmos.color = new Color(0f, 1f, 1f, 0.3f);
            Vector3 termSize = new(
                bounds.size.x * seaCollapseScale.x,
                bounds.size.y * seaCollapseScale.y,
                bounds.size.z
            );
            Gizmos.DrawWireCube(bounds.center, termSize);
        }
#endif
    }
}