#nullable enable
using System;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UIElements;
using UVC.UIToolkit.Modal;

namespace UVC.Sample.UIToolkit
{
    /// <summary>
    /// UTKColorPicker 샘플 코드
    /// 버튼 클릭으로 컬러 피커를 열고 선택된 색상을 미리보기에 표시
    /// </summary>
    public class UTKColorPickerSample : MonoBehaviour
    {
        [SerializeField] private UIDocument? _uiDocument;

        private VisualElement? _root;
        private VisualElement? _colorPreview;
        private Label? _colorLabel;
        private Toggle? _useAlphaToggle;

        private Color _currentColor = Color.blue;
        private UTKColorPicker? _currentPicker;

        private void Start()
        {
            if (_uiDocument == null)
            {
                Debug.LogError("UIDocument is not assigned!");
                return;
            }

            _root = _uiDocument.rootVisualElement;
            CreateSampleUI();
        }

        private void CreateSampleUI()
        {
            if (_root == null) return;

            // 메인 컨테이너
            var container = new VisualElement();
            container.style.position = Position.Absolute;
            container.style.left = 20;
            container.style.top = 20;
            container.style.backgroundColor = new Color(0.2f, 0.2f, 0.2f);
            container.style.borderTopLeftRadius = 8;
            container.style.borderTopRightRadius = 8;
            container.style.borderBottomLeftRadius = 8;
            container.style.borderBottomRightRadius = 8;
            container.style.paddingTop = 15;
            container.style.paddingBottom = 15;
            container.style.paddingLeft = 15;
            container.style.paddingRight = 15;
            container.style.width = 280;

            // 타이틀
            var title = new Label("UTKColorPicker Sample");
            title.style.fontSize = 16;
            title.style.unityFontStyleAndWeight = FontStyle.Bold;
            title.style.color = Color.white;
            title.style.marginBottom = 15;
            container.Add(title);

            // 색상 미리보기 영역
            var previewRow = new VisualElement();
            previewRow.style.flexDirection = FlexDirection.Row;
            previewRow.style.alignItems = Align.Center;
            previewRow.style.marginBottom = 15;

            var previewLabel = new Label("Current Color:");
            previewLabel.style.color = Color.white;
            previewLabel.style.width = 100;
            previewRow.Add(previewLabel);

            _colorPreview = new VisualElement();
            _colorPreview.style.width = 60;
            _colorPreview.style.height = 30;
            _colorPreview.style.backgroundColor = _currentColor;
            _colorPreview.style.borderTopLeftRadius = 4;
            _colorPreview.style.borderTopRightRadius = 4;
            _colorPreview.style.borderBottomLeftRadius = 4;
            _colorPreview.style.borderBottomRightRadius = 4;
            _colorPreview.style.borderTopWidth = 1;
            _colorPreview.style.borderBottomWidth = 1;
            _colorPreview.style.borderLeftWidth = 1;
            _colorPreview.style.borderRightWidth = 1;
            _colorPreview.style.borderTopColor = new Color(0.4f, 0.4f, 0.4f);
            _colorPreview.style.borderBottomColor = new Color(0.4f, 0.4f, 0.4f);
            _colorPreview.style.borderLeftColor = new Color(0.4f, 0.4f, 0.4f);
            _colorPreview.style.borderRightColor = new Color(0.4f, 0.4f, 0.4f);
            previewRow.Add(_colorPreview);

            _colorLabel = new Label(ColorToHex(_currentColor));
            _colorLabel.style.color = new Color(0.7f, 0.7f, 0.7f);
            _colorLabel.style.marginLeft = 10;
            previewRow.Add(_colorLabel);

            container.Add(previewRow);

            // Alpha 사용 토글
            var alphaRow = new VisualElement();
            alphaRow.style.flexDirection = FlexDirection.Row;
            alphaRow.style.alignItems = Align.Center;
            alphaRow.style.marginBottom = 15;

            _useAlphaToggle = new Toggle("Use Alpha Channel");
            _useAlphaToggle.value = true;
            _useAlphaToggle.style.color = Color.white;
            alphaRow.Add(_useAlphaToggle);

            container.Add(alphaRow);

            // 버튼
            var openPickerBtn = new Button(OpenColorPicker) { text = "Open Color Picker" };
            openPickerBtn.style.height = 32;
            openPickerBtn.style.marginBottom = 10;
            container.Add(openPickerBtn);

            // Async 버튼
            var openPickerAsyncBtn = new Button(() => OpenColorPickerAsync().Forget()) { text = "Open Color Picker (Async)" };
            openPickerAsyncBtn.style.height = 32;
            openPickerAsyncBtn.style.marginBottom = 10;
            container.Add(openPickerAsyncBtn);

            // 프리셋 색상 버튼들
            var presetLabel = new Label("Preset Colors:");
            presetLabel.style.color = Color.white;
            presetLabel.style.marginTop = 10;
            presetLabel.style.marginBottom = 5;
            container.Add(presetLabel);

            var presetRow = new VisualElement();
            presetRow.style.flexDirection = FlexDirection.Row;
            presetRow.style.flexWrap = Wrap.Wrap;

            Color[] presets = { Color.red, Color.green, Color.blue, Color.yellow, Color.cyan, Color.magenta, Color.white, Color.black };
            foreach (var color in presets)
            {
                var presetBtn = new Button(() => SetColor(color));
                presetBtn.style.width = 28;
                presetBtn.style.height = 28;
                presetBtn.style.marginRight = 5;
                presetBtn.style.marginBottom = 5;
                presetBtn.style.backgroundColor = color;
                presetBtn.style.borderTopLeftRadius = 4;
                presetBtn.style.borderTopRightRadius = 4;
                presetBtn.style.borderBottomLeftRadius = 4;
                presetBtn.style.borderBottomRightRadius = 4;
                presetBtn.text = "";
                presetRow.Add(presetBtn);
            }

            container.Add(presetRow);

            _root.Add(container);
        }

        private void OpenColorPicker()
        {
            if (_root == null || _currentPicker != null) return;

            bool useAlpha = _useAlphaToggle?.value ?? false;

            _currentPicker = UTKColorPicker.Show(_root, _currentColor, "Select Color", useAlpha);

            _currentPicker.OnColorChanged += OnColorChanged;
            _currentPicker.OnColorSelected += OnColorSelected;
        }

        private async UniTaskVoid OpenColorPickerAsync()
        {
            if (_root == null) return;

            bool useAlpha = _useAlphaToggle?.value ?? true;

            // ShowAsync를 사용하여 색상 선택 대기
            // OK 클릭 시 선택된 색상 반환, 취소/닫기 시 _currentColor 반환
            Color selectedColor = await UTKColorPicker.ShowAsync(_root, _currentColor, "Select Color (Async)", useAlpha);

            // 결과 처리
            _currentColor = selectedColor;
            if (_colorPreview != null)
            {
                _colorPreview.style.backgroundColor = selectedColor;
            }
            if (_colorLabel != null)
            {
                _colorLabel.text = ColorToHex(selectedColor);
            }

            Debug.Log($"[Async] Color Result: {ColorToHex(selectedColor)}");
        }

        private void OnColorChanged(Color color)
        {
            // 실시간 미리보기 업데이트
            if (_colorPreview != null)
            {
                _colorPreview.style.backgroundColor = color;
            }

            if (_colorLabel != null)
            {
                _colorLabel.text = ColorToHex(color);
            }
        }

        private void OnColorSelected(Color color)
        {
            _currentColor = color;
            Debug.Log($"Color Selected: {ColorToHex(color)}");

            // 피커 참조 정리
            if (_currentPicker != null)
            {
                _currentPicker.OnColorChanged -= OnColorChanged;
                _currentPicker.OnColorSelected -= OnColorSelected;
                _currentPicker = null;
            }
        }

        private void SetColor(Color color)
        {
            _currentColor = color;

            if (_colorPreview != null)
            {
                _colorPreview.style.backgroundColor = color;
            }

            if (_colorLabel != null)
            {
                _colorLabel.text = ColorToHex(color);
            }

            Debug.Log($"Preset Color Set: {ColorToHex(color)}");
        }

        private string ColorToHex(Color color)
        {
            bool useAlpha = _useAlphaToggle?.value ?? false;
            if (useAlpha)
            {
                return "#" + ColorUtility.ToHtmlStringRGBA(color);
            }
            return "#" + ColorUtility.ToHtmlStringRGB(color);
        }

        private void OnDestroy()
        {
            if (_currentPicker != null)
            {
                _currentPicker.OnColorChanged -= OnColorChanged;
                _currentPicker.OnColorSelected -= OnColorSelected;
                _currentPicker.Dispose();
                _currentPicker = null;
            }
        }
    }
}