using BuyMeCofee.Maui.Constants;
using BuyMeCofee.Maui.Helpers;
using BuyMeCofee.Maui.Models;
using Microsoft.Maui.Controls.Shapes;

namespace BuyMeCofee.Maui.Controls;

/// <summary>
/// A branded Buy Me a Coffee support widget with amount entry, preset chips,
/// name/message fields, and a monthly toggle. Opens the BMC page on support tap.
/// </summary>
public class BuyMeACoffeeWidget : ContentView
{
    #region Bindable Properties

    public static readonly BindableProperty UsernameProperty =
        BindableProperty.Create(nameof(Username), typeof(string), typeof(BuyMeACoffeeWidget),
            string.Empty, propertyChanged: OnUsernameChanged);

    public static readonly BindableProperty DisplayNameProperty =
        BindableProperty.Create(nameof(DisplayName), typeof(string), typeof(BuyMeACoffeeWidget),
            string.Empty, propertyChanged: OnDisplayNameChanged);

    public static readonly BindableProperty SuggestedAmountsProperty =
        BindableProperty.Create(nameof(SuggestedAmounts), typeof(int[]), typeof(BuyMeACoffeeWidget),
            BmcConstants.DefaultSuggestedAmounts, propertyChanged: OnChipsChanged);

    public static readonly BindableProperty DefaultAmountProperty =
        BindableProperty.Create(nameof(DefaultAmount), typeof(int), typeof(BuyMeACoffeeWidget),
            5, propertyChanged: OnDefaultAmountChanged);

    public static readonly BindableProperty AccentColorProperty =
        BindableProperty.Create(nameof(AccentColor), typeof(Color), typeof(BuyMeACoffeeWidget),
            Color.FromArgb(BmcColors.WidgetPurple), propertyChanged: OnAccentChanged);

    public static readonly BindableProperty ShowMonthlyOptionProperty =
        BindableProperty.Create(nameof(ShowMonthlyOption), typeof(bool), typeof(BuyMeACoffeeWidget),
            true, propertyChanged: OnShowMonthlyChanged);

    public static readonly BindableProperty SupportButtonTextProperty =
        BindableProperty.Create(nameof(SupportButtonText), typeof(string), typeof(BuyMeACoffeeWidget),
            BmcConstants.DefaultSupportButtonText);

    #endregion

    #region Properties

    /// <summary>Your Buy Me a Coffee username/slug.</summary>
    public string Username
    {
        get => (string)GetValue(UsernameProperty);
        set => SetValue(UsernameProperty, value);
    }

    /// <summary>Name displayed in "Support {DisplayName}" header.</summary>
    public string DisplayName
    {
        get => (string)GetValue(DisplayNameProperty);
        set => SetValue(DisplayNameProperty, value);
    }

    /// <summary>Preset amount chips. Default: [25, 50, 100]</summary>
    public int[] SuggestedAmounts
    {
        get => (int[])GetValue(SuggestedAmountsProperty);
        set => SetValue(SuggestedAmountsProperty, value);
    }

    /// <summary>Initial amount in the entry field. Default: 5</summary>
    public int DefaultAmount
    {
        get => (int)GetValue(DefaultAmountProperty);
        set => SetValue(DefaultAmountProperty, value);
    }

    /// <summary>Accent color for the Support button. Default: BMC purple (#6C5CE7)</summary>
    public Color AccentColor
    {
        get => (Color)GetValue(AccentColorProperty);
        set => SetValue(AccentColorProperty, value);
    }

    /// <summary>Whether to show the "Make this monthly" checkbox. Default: true</summary>
    public bool ShowMonthlyOption
    {
        get => (bool)GetValue(ShowMonthlyOptionProperty);
        set => SetValue(ShowMonthlyOptionProperty, value);
    }

    /// <summary>Text on the support button. Default: "Support"</summary>
    public string SupportButtonText
    {
        get => (string)GetValue(SupportButtonTextProperty);
        set => SetValue(SupportButtonTextProperty, value);
    }

    #endregion

    /// <summary>Raised when the user taps the Support button, before opening the browser.</summary>
    public event EventHandler<SupportRequestedEventArgs>? SupportRequested;

    // Internal UI elements
    private Label _headerLabel = null!;
    private Entry _amountEntry = null!;
    private HorizontalStackLayout _chipsRow = null!;
    private Entry _nameEntry = null!;
    private Editor _messageEditor = null!;
    private CheckBox _monthlyCheckBox = null!;
    private HorizontalStackLayout _monthlyRow = null!;
    private Border _supportButton = null!;
    private Label _supportButtonLabel = null!;
    private Label _footerLabel = null!;

    private int _currentAmount;

    public BuyMeACoffeeWidget()
    {
        _currentAmount = DefaultAmount;
        BuildLayout();
    }

    private void BuildLayout()
    {
        // Header
        _headerLabel = new Label
        {
            Text = string.IsNullOrWhiteSpace(DisplayName) ? "Support" : $"Support {DisplayName}",
            FontSize = 20,
            FontAttributes = FontAttributes.Bold,
            Margin = new Thickness(0, 0, 0, 8),
        };

        // Amount row: $ + Entry + chips
        var dollarLabel = new Label
        {
            Text = "$",
            FontSize = 18,
            VerticalOptions = LayoutOptions.Center,
            TextColor = Colors.Gray,
        };

        _amountEntry = new Entry
        {
            Text = _currentAmount.ToString(),
            Keyboard = Keyboard.Numeric,
            FontSize = 16,
            Placeholder = "Enter amount",
            HorizontalOptions = LayoutOptions.Fill,
            VerticalOptions = LayoutOptions.Center,
        };
        _amountEntry.TextChanged += OnAmountTextChanged;

        _chipsRow = new HorizontalStackLayout { Spacing = 6 };
        BuildChips();

        var amountRow = new Grid
        {
            ColumnDefinitions =
            {
                new ColumnDefinition(GridLength.Auto),
                new ColumnDefinition(GridLength.Star),
                new ColumnDefinition(GridLength.Auto),
            },
            ColumnSpacing = 8,
            VerticalOptions = LayoutOptions.Center,
        };
        amountRow.Add(dollarLabel, 0);
        amountRow.Add(_amountEntry, 1);
        amountRow.Add(_chipsRow, 2);

        var amountBorder = CreateFieldBorder(amountRow);

        // Name field
        _nameEntry = new Entry
        {
            Placeholder = "Name or @yoursocial",
            FontSize = 14,
        };
        var nameBorder = CreateFieldBorder(_nameEntry);

        // Message field
        _messageEditor = new Editor
        {
            Placeholder = "Say something nice...",
            FontSize = 14,
            HeightRequest = 80,
            AutoSize = EditorAutoSizeOption.TextChanges,
        };
        var messageBorder = CreateFieldBorder(_messageEditor);

        // Monthly toggle
        _monthlyCheckBox = new CheckBox
        {
            VerticalOptions = LayoutOptions.Center,
        };
        var monthlyLabel = new Label
        {
            Text = "Make this monthly",
            FontSize = 14,
            VerticalOptions = LayoutOptions.Center,
        };
        _monthlyRow = new HorizontalStackLayout
        {
            Spacing = 4,
            IsVisible = ShowMonthlyOption,
            Children = { _monthlyCheckBox, monthlyLabel }
        };

        // Support button
        _supportButtonLabel = new Label
        {
            Text = SupportButtonText,
            FontSize = 16,
            FontAttributes = FontAttributes.Bold,
            TextColor = Colors.White,
            HorizontalOptions = LayoutOptions.Center,
            VerticalOptions = LayoutOptions.Center,
        };

        _supportButton = new Border
        {
            BackgroundColor = AccentColor,
            StrokeShape = new RoundRectangle { CornerRadius = new Microsoft.Maui.CornerRadius(24) },
            Stroke = Colors.Transparent,
            Padding = new Thickness(0, 14),
            HorizontalOptions = LayoutOptions.Fill,
            Content = _supportButtonLabel,
        };

        var supportTap = new TapGestureRecognizer();
        supportTap.Tapped += OnSupportTapped;
        _supportButton.GestureRecognizers.Add(supportTap);

        var supportHover = new PointerGestureRecognizer();
        supportHover.PointerEntered += (_, _) => _supportButton.Opacity = 0.85;
        supportHover.PointerExited += (_, _) => _supportButton.Opacity = 1.0;
        _supportButton.GestureRecognizers.Add(supportHover);

        // Redirect note
        var redirectNote = new Label
        {
            Text = "You'll complete your support on buymeacoffee.com",
            FontSize = 11,
            TextColor = Colors.Gray,
            HorizontalOptions = LayoutOptions.Center,
            Margin = new Thickness(0, -4, 0, 0),
        };

        // Footer
        var footerCup = new Image
        {
            Source = BmcBrandAssets.GetCupLogo(),
            HeightRequest = 16,
            Aspect = Aspect.AspectFit,
            VerticalOptions = LayoutOptions.Center,
        };
        _footerLabel = new Label
        {
            Text = $"buymeacoffee.com/{Username}",
            FontSize = 12,
            TextColor = Colors.Gray,
            VerticalOptions = LayoutOptions.Center,
            TextDecorations = TextDecorations.Underline,
        };
        var footerStack = new HorizontalStackLayout
        {
            Spacing = 4,
            HorizontalOptions = LayoutOptions.Center,
            Children = { footerCup, _footerLabel }
        };
        var footerTap = new TapGestureRecognizer();
        footerTap.Tapped += OnFooterTapped;
        footerStack.GestureRecognizers.Add(footerTap);

        // Card layout
        var cardContent = new VerticalStackLayout
        {
            Spacing = 12,
            Padding = new Thickness(20),
            Children =
            {
                _headerLabel,
                amountBorder,
                nameBorder,
                messageBorder,
                _monthlyRow,
                _supportButton,
                redirectNote,
                footerStack,
            }
        };

        var card = new Border
        {
            StrokeShape = new RoundRectangle { CornerRadius = new Microsoft.Maui.CornerRadius(BmcConstants.WidgetCornerRadius) },
            Stroke = new SolidColorBrush(Color.FromArgb("#E0E0E0")),
            StrokeThickness = 1,
            BackgroundColor = Colors.White,
            Shadow = new Shadow
            {
                Brush = new SolidColorBrush(Colors.Black),
                Offset = new Point(0, 4),
                Radius = 12,
                Opacity = 0.10f,
            },
            Content = cardContent,
            MaximumWidthRequest = 380,
        };

        Content = card;
    }

    private Border CreateFieldBorder(View content)
    {
        return new Border
        {
            StrokeShape = new RoundRectangle { CornerRadius = new Microsoft.Maui.CornerRadius(10) },
            Stroke = new SolidColorBrush(Color.FromArgb("#E0E0E0")),
            StrokeThickness = 1,
            Padding = new Thickness(12, 6),
            Content = content,
        };
    }

    private void BuildChips()
    {
        _chipsRow.Children.Clear();
        foreach (var amount in SuggestedAmounts)
        {
            var chipLabel = new Label
            {
                Text = $"+{amount}",
                FontSize = 13,
                FontAttributes = FontAttributes.Bold,
                TextColor = Color.FromArgb(BmcColors.BrandDark),
                VerticalOptions = LayoutOptions.Center,
                Padding = new Thickness(10, 4),
            };

            var chip = new Border
            {
                StrokeShape = new RoundRectangle { CornerRadius = new Microsoft.Maui.CornerRadius(6) },
                Stroke = new SolidColorBrush(Color.FromArgb("#E0E0E0")),
                StrokeThickness = 1,
                BackgroundColor = Color.FromArgb("#F5F5F5"),
                Content = chipLabel,
                VerticalOptions = LayoutOptions.Center,
            };

            var chipTap = new TapGestureRecognizer();
            var capturedAmount = amount;
            chipTap.Tapped += (_, _) =>
            {
                _currentAmount = capturedAmount;
                _amountEntry.Text = _currentAmount.ToString();
            };
            chip.GestureRecognizers.Add(chipTap);

            _chipsRow.Children.Add(chip);
        }
    }

    private void OnAmountTextChanged(object? sender, TextChangedEventArgs e)
    {
        if (int.TryParse(e.NewTextValue, out var amount) && amount >= 0)
            _currentAmount = amount;
    }

    private async void OnSupportTapped(object? sender, TappedEventArgs e)
    {
        if (string.IsNullOrWhiteSpace(Username)) return;

        // Fire event with collected data
        SupportRequested?.Invoke(this, new SupportRequestedEventArgs
        {
            Username = Username,
            Amount = _currentAmount,
            Name = string.IsNullOrWhiteSpace(_nameEntry.Text) ? null : _nameEntry.Text,
            Message = string.IsNullOrWhiteSpace(_messageEditor.Text) ? null : _messageEditor.Text,
            IsMonthly = _monthlyCheckBox.IsChecked,
        });

        // Animate
        await _supportButton.ScaleToAsync(0.95, 80, Easing.CubicIn);
        await _supportButton.ScaleToAsync(1.0, 80, Easing.CubicOut);

        // Open browser
        await Launcher.Default.OpenAsync(new Uri($"{BmcConstants.BaseUrl}{Username}"));
    }

    private async void OnFooterTapped(object? sender, TappedEventArgs e)
    {
        if (string.IsNullOrWhiteSpace(Username)) return;
        await Launcher.Default.OpenAsync(new Uri($"{BmcConstants.BaseUrl}{Username}"));
    }

    #region Property Changed Handlers

    private static void OnUsernameChanged(BindableObject bindable, object oldValue, object newValue)
    {
        if (bindable is BuyMeACoffeeWidget widget)
            widget._footerLabel.Text = $"buymeacoffee.com/{newValue}";
    }

    private static void OnDisplayNameChanged(BindableObject bindable, object oldValue, object newValue)
    {
        if (bindable is BuyMeACoffeeWidget widget)
        {
            var name = (string)newValue;
            widget._headerLabel.Text = string.IsNullOrWhiteSpace(name) ? "Support" : $"Support {name}";
        }
    }

    private static void OnChipsChanged(BindableObject bindable, object oldValue, object newValue)
    {
        if (bindable is BuyMeACoffeeWidget widget)
            widget.BuildChips();
    }

    private static void OnDefaultAmountChanged(BindableObject bindable, object oldValue, object newValue)
    {
        if (bindable is BuyMeACoffeeWidget widget)
        {
            widget._currentAmount = (int)newValue;
            widget._amountEntry.Text = widget._currentAmount.ToString();
        }
    }

    private static void OnAccentChanged(BindableObject bindable, object oldValue, object newValue)
    {
        if (bindable is BuyMeACoffeeWidget widget)
            widget._supportButton.BackgroundColor = (Color)newValue;
    }

    private static void OnShowMonthlyChanged(BindableObject bindable, object oldValue, object newValue)
    {
        if (bindable is BuyMeACoffeeWidget widget)
            widget._monthlyRow.IsVisible = (bool)newValue;
    }

    #endregion
}