using System;
using System.Collections.Generic;
using UnityEngine;

namespace UnityEngine.UI
{
    public enum UXBindingFallbackMode
    {
        KeepCurrent = 0,
        RestoreCapturedDefault = 1,
        UseCustomValue = 2
    }

    public enum UXBindingValueKind
    {
        Boolean = 0,
        Float = 1,
        String = 2,
        Color = 3,
        Vector2 = 4,
        Vector3 = 5,
        ObjectReference = 6
    }

    public enum UXBindingProperty
    {
        GameObjectActive = 0,
        CanvasGroupAlpha = 1,
        CanvasGroupInteractable = 2,
        CanvasGroupBlocksRaycasts = 3,
        GraphicColor = 4,
        GraphicMaterial = 5,
        ImageSprite = 6,
        TextContent = 7,
        TextColor = 8,
        RectTransformAnchoredPosition = 9,
        TransformLocalScale = 10,
        TransformLocalEulerAngles = 11
    }

    [Serializable]
    public sealed class UXBindingValue
    {
        [SerializeField] private bool _boolValue;
        [SerializeField] private float _floatValue;
        [SerializeField] private string _stringValue = string.Empty;
        [SerializeField] private Color _colorValue = Color.white;
        [SerializeField] private Vector2 _vector2Value;
        [SerializeField] private Vector3 _vector3Value;
        [SerializeField] private UnityEngine.Object _objectValue;

        public bool BoolValue
        {
            get => _boolValue;
            set => _boolValue = value;
        }

        public float FloatValue
        {
            get => _floatValue;
            set => _floatValue = value;
        }

        public string StringValue
        {
            get => _stringValue;
            set => _stringValue = value ?? string.Empty;
        }

        public Color ColorValue
        {
            get => _colorValue;
            set => _colorValue = value;
        }

        public Vector2 Vector2Value
        {
            get => _vector2Value;
            set => _vector2Value = value;
        }

        public Vector3 Vector3Value
        {
            get => _vector3Value;
            set => _vector3Value = value;
        }

        public UnityEngine.Object ObjectValue
        {
            get => _objectValue;
            set => _objectValue = value;
        }

        public void CopyFrom(UXBindingValue other)
        {
            if (other == null)
            {
                return;
            }

            _boolValue = other._boolValue;
            _floatValue = other._floatValue;
            _stringValue = other._stringValue;
            _colorValue = other._colorValue;
            _vector2Value = other._vector2Value;
            _vector3Value = other._vector3Value;
            _objectValue = other._objectValue;
        }
    }

    [DisallowMultipleComponent]
    [AddComponentMenu("UX/UX Binding")]
    public sealed class UXBinding : MonoBehaviour
    {
        [Serializable]
        public sealed class BindingEntry
        {
            [SerializeField] private string _controllerId = string.Empty;
            [SerializeField] private int _controllerIndex;
            [SerializeField] private UXBindingProperty _property = UXBindingProperty.GameObjectActive;
            [SerializeField] private UXBindingValue _value = new UXBindingValue();
            [SerializeField] private UXBindingFallbackMode _fallbackMode = UXBindingFallbackMode.RestoreCapturedDefault;
            [SerializeField] private UXBindingValue _fallbackValue = new UXBindingValue();
            [HideInInspector] [SerializeField] private UXBindingValue _capturedDefault = new UXBindingValue();
            [HideInInspector] [SerializeField] private bool _hasCapturedDefault;
            [HideInInspector] [SerializeField] private UXBindingProperty _capturedProperty = UXBindingProperty.GameObjectActive;

            public string ControllerId
            {
                get => _controllerId;
                set => _controllerId = value ?? string.Empty;
            }

            public int ControllerIndex
            {
                get => Mathf.Max(0, _controllerIndex);
                set => _controllerIndex = Mathf.Max(0, value);
            }

            public UXBindingProperty Property
            {
                get => _property;
                set => _property = value;
            }

            public UXBindingValue Value => _value;

            public UXBindingFallbackMode FallbackMode
            {
                get => _fallbackMode;
                set => _fallbackMode = value;
            }

            public UXBindingValue FallbackValue => _fallbackValue;
            public bool HasCapturedDefault => _hasCapturedDefault;

            internal void Normalize()
            {
                if (_property != UXBindingProperty.GameObjectActive)
                {
                    return;
                }

                if (_fallbackMode == UXBindingFallbackMode.RestoreCapturedDefault)
                {
                    _fallbackMode = UXBindingFallbackMode.UseCustomValue;
                    _fallbackValue.BoolValue = false;
                }
            }

            internal void CaptureDefault(GameObject target)
            {
                if (target == null || !UXBindingPropertyUtility.IsSupported(target, _property))
                {
                    return;
                }

                UXBindingPropertyUtility.CaptureValue(target, _property, _capturedDefault);
                _capturedProperty = _property;
                _hasCapturedDefault = true;
            }

            internal void CaptureCurrentAsValue(GameObject target)
            {
                if (target == null || !UXBindingPropertyUtility.IsSupported(target, _property))
                {
                    return;
                }

                UXBindingPropertyUtility.CaptureValue(target, _property, _value);
            }

            internal void CaptureCurrentAsFallback(GameObject target)
            {
                if (target == null || !UXBindingPropertyUtility.IsSupported(target, _property))
                {
                    return;
                }

                UXBindingPropertyUtility.CaptureValue(target, _property, _fallbackValue);
            }

            internal void ResetToCapturedDefault(GameObject target)
            {
                if (target == null)
                {
                    return;
                }

                if (!_hasCapturedDefault || _capturedProperty != _property)
                {
                    CaptureDefault(target);
                }

                UXBindingPropertyUtility.ApplyValue(target, _property, _capturedDefault);
            }

            internal void Apply(GameObject target, string controllerId, int selectedIndex)
            {
                if (target == null || !string.Equals(_controllerId, controllerId, StringComparison.Ordinal))
                {
                    return;
                }

                if (!_hasCapturedDefault || _capturedProperty != _property)
                {
                    CaptureDefault(target);
                }

                if (!UXBindingPropertyUtility.IsSupported(target, _property))
                {
                    return;
                }

                if (selectedIndex == _controllerIndex)
                {
                    UXBindingPropertyUtility.ApplyValue(target, _property, _value);
                    return;
                }

                switch (_fallbackMode)
                {
                    case UXBindingFallbackMode.KeepCurrent:
                        return;
                    case UXBindingFallbackMode.RestoreCapturedDefault:
                        if (_hasCapturedDefault)
                        {
                            UXBindingPropertyUtility.ApplyValue(target, _property, _capturedDefault);
                        }
                        return;
                    case UXBindingFallbackMode.UseCustomValue:
                        UXBindingPropertyUtility.ApplyValue(target, _property, _fallbackValue);
                        return;
                }
            }
        }

        [SerializeField] private UXController _controller;
        [SerializeField] private List<BindingEntry> _entries = new List<BindingEntry>();

        private bool _initialized;

        public UXController Controller => _controller;
        public List<BindingEntry> Entries => _entries;

        public void Initialize()
        {
            if (_initialized)
            {
                return;
            }

            _initialized = true;
            NormalizeEntries();
            EnsureControllerReference();
            RegisterToController();
            CaptureDefaults();
        }

        public void SetController(UXController controller)
        {
            if (_controller == controller)
            {
                return;
            }

            if (_controller != null)
            {
                _controller.UnregisterBinding(this);
            }

            _controller = controller;
            RegisterToController();
        }

        public void CaptureDefaults()
        {
            for (int i = 0; i < _entries.Count; i++)
            {
                if (_entries[i] != null)
                {
                    _entries[i].CaptureDefault(gameObject);
                }
            }
        }

        public void ResetToDefaults()
        {
            for (int i = 0; i < _entries.Count; i++)
            {
                if (_entries[i] != null)
                {
                    _entries[i].ResetToCapturedDefault(gameObject);
                }
            }
        }

        public void PreviewEntry(int entryIndex)
        {
            if (_controller == null || entryIndex < 0 || entryIndex >= _entries.Count)
            {
                return;
            }

            BindingEntry entry = _entries[entryIndex];
            if (entry == null || string.IsNullOrWhiteSpace(entry.ControllerId))
            {
                return;
            }

            _controller.SetControllerIndex(entry.ControllerId, entry.ControllerIndex);
        }

        public void CaptureEntryValue(int entryIndex)
        {
            if (entryIndex < 0 || entryIndex >= _entries.Count || _entries[entryIndex] == null)
            {
                return;
            }

            _entries[entryIndex].CaptureCurrentAsValue(gameObject);
        }

        public void CaptureEntryFallbackValue(int entryIndex)
        {
            if (entryIndex < 0 || entryIndex >= _entries.Count || _entries[entryIndex] == null)
            {
                return;
            }

            _entries[entryIndex].CaptureCurrentAsFallback(gameObject);
        }

        internal void OnControllerChanged(string controllerId, int selectedIndex)
        {
            for (int i = 0; i < _entries.Count; i++)
            {
                BindingEntry entry = _entries[i];
                if (entry != null)
                {
                    entry.Apply(gameObject, controllerId, selectedIndex);
                }
            }
        }

        private void Reset()
        {
            EnsureControllerReference();
            RegisterToController();
        }

        private void Awake()
        {
            Initialize();
        }

        private void OnValidate()
        {
            NormalizeEntries();
            EnsureControllerReference();
            RegisterToController();
        }

        private void OnDestroy()
        {
            if (_controller != null)
            {
                _controller.UnregisterBinding(this);
            }
        }

        private void EnsureControllerReference()
        {
            if (_controller == null)
            {
                _controller = GetComponentInParent<UXController>();
            }
        }

        private void RegisterToController()
        {
            if (_controller != null)
            {
                _controller.RegisterBinding(this);
            }
        }

        private void NormalizeEntries()
        {
            for (int i = 0; i < _entries.Count; i++)
            {
                if (_entries[i] != null)
                {
                    _entries[i].Normalize();
                }
            }
        }
    }
}