XRLib/Assets/Scripts/UVC/UIToolkit/Property/Items/UTKDateRangePropertyItem.cs

#nullable enable
using System;
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// 날짜 범위 속성 아이템
    /// 시작일, 종료일 두 개의 DatePicker
    /// </summary>
    public class UTKDateRangePropertyItem : UTKPropertyItemBase<UTKDateRange>
    {
        #region Fields
        private TextField? _startField;
        private TextField? _endField;
        private Button? _startPickerBtn;
        private Button? _endPickerBtn;
        private UTKDatePicker? _currentPicker;
        private bool _isEditingStart;
        private string _dateFormat = "yyyy-MM-dd";
        #endregion

        #region Properties
        public override UTKPropertyType PropertyType => UTKPropertyType.DateRange;

        public string DateFormat
        {
            get => _dateFormat;
            set
            {
                _dateFormat = value ?? "yyyy-MM-dd";
                RefreshUI();
            }
        }
        #endregion

        #region Constructor
        public UTKDateRangePropertyItem(string id, string name, UTKDateRange initialValue = default)
            : base(id, name, initialValue.Start == default ? new UTKDateRange(DateTime.Today, DateTime.Today) : initialValue)
        {
        }

        public UTKDateRangePropertyItem(string id, string name, DateTime start, DateTime end)
            : base(id, name, new UTKDateRange(start, end))
        {
        }
        #endregion

        #region Override Methods
        public override VisualElement CreateUI()
        {
            var container = CreateContainer();

            var label = CreateNameLabel();
            container.Add(label);

            var valueContainer = new VisualElement();
            valueContainer.AddToClassList("utk-property-item__value");
            valueContainer.style.flexDirection = FlexDirection.Row;

            // Start field
            _startField = new TextField();
            _startField.name = "start-field";
            _startField.value = Value.Start.ToString(_dateFormat);
            _startField.style.flexGrow = 1;
            valueContainer.Add(_startField);

            _startPickerBtn = new Button { text = "..." };
            _startPickerBtn.name = "start-picker-btn";
            _startPickerBtn.AddToClassList("utk-property-item__picker-btn");
            valueContainer.Add(_startPickerBtn);

            var separator = new Label("~");
            separator.AddToClassList("utk-property-item__range-separator");
            valueContainer.Add(separator);

            // End field
            _endField = new TextField();
            _endField.name = "end-field";
            _endField.value = Value.End.ToString(_dateFormat);
            _endField.style.flexGrow = 1;
            valueContainer.Add(_endField);

            _endPickerBtn = new Button { text = "..." };
            _endPickerBtn.name = "end-picker-btn";
            _endPickerBtn.AddToClassList("utk-property-item__picker-btn");
            valueContainer.Add(_endPickerBtn);

            container.Add(valueContainer);

            return container;
        }

        public override void BindUI(VisualElement element)
        {
            base.BindUI(element);

            _startField = element.Q<TextField>("start-field");
            _endField = element.Q<TextField>("end-field");
            _startPickerBtn = element.Q<Button>("start-picker-btn");
            _endPickerBtn = element.Q<Button>("end-picker-btn");

            if (_startField != null)
            {
                _startField.value = Value.Start.ToString(_dateFormat);
                _startField.SetEnabled(!IsReadOnly);
                _startField.RegisterValueChangedCallback(OnStartTextChanged);
            }

            if (_endField != null)
            {
                _endField.value = Value.End.ToString(_dateFormat);
                _endField.SetEnabled(!IsReadOnly);
                _endField.RegisterValueChangedCallback(OnEndTextChanged);
            }

            if (_startPickerBtn != null)
            {
                _startPickerBtn.SetEnabled(!IsReadOnly);
                _startPickerBtn.clicked += OnStartPickerClicked;
            }

            if (_endPickerBtn != null)
            {
                _endPickerBtn.SetEnabled(!IsReadOnly);
                _endPickerBtn.clicked += OnEndPickerClicked;
            }
        }

        public override void UnbindUI(VisualElement element)
        {
            if (_startField != null)
            {
                _startField.UnregisterValueChangedCallback(OnStartTextChanged);
                _startField = null;
            }

            if (_endField != null)
            {
                _endField.UnregisterValueChangedCallback(OnEndTextChanged);
                _endField = null;
            }

            if (_startPickerBtn != null)
            {
                _startPickerBtn.clicked -= OnStartPickerClicked;
                _startPickerBtn = null;
            }

            if (_endPickerBtn != null)
            {
                _endPickerBtn.clicked -= OnEndPickerClicked;
                _endPickerBtn = null;
            }

            ClosePicker();
            base.UnbindUI(element);
        }

        public override void RefreshUI()
        {
            if (_startField != null)
            {
                var formatted = Value.Start.ToString(_dateFormat);
                if (_startField.value != formatted)
                {
                    _startField.SetValueWithoutNotify(formatted);
                }
            }

            if (_endField != null)
            {
                var formatted = Value.End.ToString(_dateFormat);
                if (_endField.value != formatted)
                {
                    _endField.SetValueWithoutNotify(formatted);
                }
            }
        }

        protected override void UpdateReadOnlyState()
        {
            base.UpdateReadOnlyState();

            _startField?.SetEnabled(!IsReadOnly);
            _endField?.SetEnabled(!IsReadOnly);
            _startPickerBtn?.SetEnabled(!IsReadOnly);
            _endPickerBtn?.SetEnabled(!IsReadOnly);
        }
        #endregion

        #region Private Methods
        private void OnStartPickerClicked()
        {
            _isEditingStart = true;
            OpenPicker(Value.Start);
        }

        private void OnEndPickerClicked()
        {
            _isEditingStart = false;
            OpenPicker(Value.End);
        }

        private void OpenPicker(DateTime initialDate)
        {
            if (_currentPicker != null || _rootElement == null) return;

            var root = _rootElement;
            while (root.parent != null) root = root.parent;

            string title = _isEditingStart ? $"{Name} - 시작일" : $"{Name} - 종료일";
            _currentPicker = UTKDatePicker.Show(root, initialDate, UTKDatePicker.PickerMode.DateOnly, title);
            _currentPicker.OnDateSelected += OnPickerDateSelected;
            _currentPicker.OnClosed += OnPickerClosed;
        }

        private void ClosePicker()
        {
            if (_currentPicker != null)
            {
                _currentPicker.OnDateSelected -= OnPickerDateSelected;
                _currentPicker.OnClosed -= OnPickerClosed;
                _currentPicker.Dispose();
                _currentPicker = null;
            }
        }

        private void OnPickerDateSelected(DateTime date)
        {
            if (_isEditingStart)
            {
                Value = new UTKDateRange(date.Date, Value.End);
            }
            else
            {
                Value = new UTKDateRange(Value.Start, date.Date);
            }
            ClosePicker();
        }

        private void OnPickerClosed() => _currentPicker = null;

        private void OnStartTextChanged(ChangeEvent<string> evt)
        {
            if (DateTime.TryParse(evt.newValue, out DateTime date))
            {
                var newValue = new UTKDateRange(date.Date, Value.End);
                DebounceValueChange(newValue, 500).Forget();
            }
        }

        private void OnEndTextChanged(ChangeEvent<string> evt)
        {
            if (DateTime.TryParse(evt.newValue, out DateTime date))
            {
                var newValue = new UTKDateRange(Value.Start, date.Date);
                DebounceValueChange(newValue, 500).Forget();
            }
        }
        #endregion

        #region IDisposable
        protected override void Dispose(bool disposing)
        {
            if (disposing) ClosePicker();
            base.Dispose(disposing);
        }
        #endregion
    }
}