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;

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

        [Header("Morph Settings")]
        [SerializeField] private Vector3 seaCollapseScale = new(0.9f, 0.84f, 1f);
        [SerializeField] private Ease morphEase = Ease.InOutCubic;

        private Transform _codeSeaTransform;
        private Vector3 _codeSeaOriginalScale;
        private Color _codeSeaOriginalColor;
        private Transform _terminalUiTransform;
        private Vector3 _terminalUiOriginalScale;

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

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

        /// <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);

            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);

            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)
                terminalUI.Begin();
        }

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

            if (_terminalUiTransform != null)
                _terminalUiTransform.localScale = Vector3.Scale(_terminalUiOriginalScale, new Vector3(1.04f, 1.04f, 1f));

            var seq = DOTween.Sequence();

            // Step 1: 短暂闪白（CRT 切换感）
            if (flashOverlay != null)
            {
                seq.Append(flashOverlay.DOFade(0.8f, 0.05f));
                seq.Append(flashOverlay.DOFade(0f, 0.12f));
            }

            // Step 2: 海浪内容退场，终端框架在门内成型
            if (codeSea != null)
            {
                codeSea.gameObject.SetActive(true);
                seq.Append(codeSea.DOColor(new Color(0.04f, 0.04f, 0.04f, 1f), 0.3f)
                    .SetEase(Ease.OutSine));
                seq.Join(codeSea.DOFade(0f, 0.78f).SetEase(Ease.InSine));
            }

            if (_codeSeaTransform != null)
            {
                seq.Join(_codeSeaTransform.DOScale(Vector3.Scale(_codeSeaOriginalScale, seaCollapseScale), 0.78f)
                    .SetEase(morphEase));
            }

            if (terminalUI != null)
            {
                float uiAlpha = 0f;
                float morph = 0f;
                seq.Join(DOTween.To(() => uiAlpha, v =>
                {
                    uiAlpha = v;
                    terminalUI.Alpha = v;
                }, 1f, 0.24f).SetEase(Ease.OutQuad));
                seq.Join(DOTween.To(() => morph, v =>
                {
                    morph = v;
                    terminalUI.MorphProgress = v;
                }, 1f, 0.82f).SetEase(morphEase));
            }

            if (_terminalUiTransform != null)
            {
                seq.Join(_terminalUiTransform.DOScale(_terminalUiOriginalScale, 0.82f)
                    .SetEase(Ease.OutCubic));
            }

            // Step 3: 第二次微闪（终端稳定）
            if (flashOverlay != null)
            {
                seq.Append(flashOverlay.DOFade(0.5f, 0.03f));
                seq.Append(flashOverlay.DOFade(0f, 0.15f));
            }

            yield return seq.WaitForCompletion();

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

        #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));

            // 同步淡出 Shapes 终端
            if (terminalUI != null)
            {
                float a = terminalUI.Alpha;
                seq.Join(DOTween.To(() => a, v => { a = v; terminalUI.Alpha = v; }, 0f, 0.4f));
            }

            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(flashOverlay);
        }

        #endregion

        #region 清理

        public void HideAll()
        {
            StopAllEffects();
            HideDoor();

            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.localScale = _terminalUiOriginalScale;

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

        #endregion

#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);

            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
    }
}