#nullable enable
using System;
using UnityEngine;
using UnityEngine.UIElements;
using UVC.Locale;
using UVC.UIToolkit.Modal;

namespace UVC.Sample.UIToolkit
{
    /// <summary>
    /// UTKDatePicker 샘플 코드
    /// 버튼 클릭으로 날짜 피커를 열고 선택된 날짜를 표시
    /// </summary>
    public class UTKDatePickerSample : MonoBehaviour
    {
        [SerializeField] private UIDocument? _uiDocument;

        private VisualElement? _root;
        private Label? _dateLabel;
        private Label? _dateTimeLabel;

        private DateTime _selectedDate = DateTime.Today;
        private DateTime _selectedDateTime = DateTime.Now;
        private UTKDatePicker? _currentPicker;

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

            bool success = LocalizationManager.Instance.LoadDefaultLocalizationData("ko", "locale.json");
            Debug.Log($"LocalizationManager: LoadDefaultLocalizationData success: {success}");

            _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 = 320;

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

            // Date Only 섹션
            var dateSection = CreateSection("Date Only Mode", "Open Date Picker", OpenDatePicker);
            _dateLabel = dateSection.label;
            _dateLabel.text = FormatDate(_selectedDate);
            container.Add(dateSection.container);

            // DateTime 섹션
            var dateTimeSection = CreateSection("Date & Time Mode", "Open DateTime Picker", OpenDateTimePicker);
            _dateTimeLabel = dateTimeSection.label;
            _dateTimeLabel.text = FormatDateTime(_selectedDateTime);
            container.Add(dateTimeSection.container);

            // 구분선
            var separator = new VisualElement();
            separator.style.height = 1;
            separator.style.backgroundColor = new Color(0.4f, 0.4f, 0.4f);
            separator.style.marginTop = 15;
            separator.style.marginBottom = 15;
            container.Add(separator);

            // 프리셋 날짜 버튼들
            var presetLabel = new Label("Quick Select:");
            presetLabel.style.color = Color.white;
            presetLabel.style.marginBottom = 10;
            container.Add(presetLabel);

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

            AddPresetButton(presetRow, "Today", DateTime.Today);
            AddPresetButton(presetRow, "Tomorrow", DateTime.Today.AddDays(1));
            AddPresetButton(presetRow, "Next Week", DateTime.Today.AddDays(7));
            AddPresetButton(presetRow, "Next Month", DateTime.Today.AddMonths(1));

            container.Add(presetRow);

            _root.Add(container);
        }

        private (VisualElement container, Label label) CreateSection(string sectionTitle, string buttonText, Action onClick)
        {
            var section = new VisualElement();
            section.style.marginBottom = 15;

            var sectionLabel = new Label(sectionTitle);
            sectionLabel.style.color = new Color(0.8f, 0.8f, 0.8f);
            sectionLabel.style.fontSize = 12;
            sectionLabel.style.marginBottom = 5;
            section.Add(sectionLabel);

            var row = new VisualElement();
            row.style.flexDirection = FlexDirection.Row;
            row.style.alignItems = Align.Center;

            var valueLabel = new Label();
            valueLabel.style.color = Color.white;
            valueLabel.style.fontSize = 14;
            valueLabel.style.flexGrow = 1;
            valueLabel.style.paddingTop = 5;
            valueLabel.style.paddingBottom = 5;
            valueLabel.style.paddingLeft = 10;
            valueLabel.style.paddingRight = 10;
            valueLabel.style.backgroundColor = new Color(0.15f, 0.15f, 0.15f);
            valueLabel.style.borderTopLeftRadius = 4;
            valueLabel.style.borderTopRightRadius = 4;
            valueLabel.style.borderBottomLeftRadius = 4;
            valueLabel.style.borderBottomRightRadius = 4;
            row.Add(valueLabel);

            var button = new Button(onClick) { text = buttonText };
            button.style.marginLeft = 10;
            button.style.height = 28;
            row.Add(button);

            section.Add(row);

            return (section, valueLabel);
        }

        private void AddPresetButton(VisualElement parent, string label, DateTime date)
        {
            var btn = new Button(() => SetDate(date)) { text = label };
            btn.style.marginRight = 5;
            btn.style.marginBottom = 5;
            btn.style.height = 28;
            parent.Add(btn);
        }

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

            _currentPicker = UTKDatePicker.Show(
                _root,
                _selectedDate,
                UTKDatePicker.PickerMode.DateOnly,
                "Select Date"
            );

            _currentPicker.OnDateSelected += OnDateSelected;
            _currentPicker.OnClosed += OnPickerClosed;
        }

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

            _currentPicker = UTKDatePicker.Show(
                _root,
                _selectedDateTime,
                UTKDatePicker.PickerMode.DateAndTime,
                "Select Date & Time"
            );

            _currentPicker.OnDateSelected += OnDateTimeSelected;
            _currentPicker.OnClosed += OnPickerClosed;
        }

        private void OnDateSelected(DateTime date)
        {
            _selectedDate = date;
            if (_dateLabel != null)
            {
                _dateLabel.text = FormatDate(date);
            }
            Debug.Log($"Date Selected: {FormatDate(date)}");
        }

        private void OnDateTimeSelected(DateTime dateTime)
        {
            _selectedDateTime = dateTime;
            if (_dateTimeLabel != null)
            {
                _dateTimeLabel.text = FormatDateTime(dateTime);
            }
            Debug.Log($"DateTime Selected: {FormatDateTime(dateTime)}");
        }

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

        private void SetDate(DateTime date)
        {
            _selectedDate = date;
            _selectedDateTime = new DateTime(date.Year, date.Month, date.Day,
                _selectedDateTime.Hour, _selectedDateTime.Minute, 0);

            if (_dateLabel != null)
            {
                _dateLabel.text = FormatDate(_selectedDate);
            }

            if (_dateTimeLabel != null)
            {
                _dateTimeLabel.text = FormatDateTime(_selectedDateTime);
            }

            Debug.Log($"Preset Date Set: {FormatDate(date)}");
        }

        private string FormatDate(DateTime date)
        {
            return date.ToString("yyyy-MM-dd");
        }

        private string FormatDateTime(DateTime dateTime)
        {
            return dateTime.ToString("yyyy-MM-dd HH:mm");
        }

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