using System.Globalization;

namespace IronServices.Maui.Controls;

/// <summary>
/// Converts an integer to a boolean (true if greater than zero).
/// </summary>
public class IsGreaterThanZeroConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is int i && i > 0;

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts a string to a boolean (true if not null or empty).
/// </summary>
public class StringToBoolConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => !string.IsNullOrEmpty(value as string);

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Inverts a boolean value.
/// </summary>
public class InvertedBoolConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is bool b && !b;

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is bool b && !b;
}

/// <summary>
/// Converts JourneyDisplayStatus or StepDisplayStatus to a Color.
/// </summary>
public class StatusToColorConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return value switch
        {
            JourneyDisplayStatus.InProgress => Colors.Blue,
            JourneyDisplayStatus.Completed => Colors.Green,
            JourneyDisplayStatus.Failed => Colors.Red,
            JourneyDisplayStatus.Abandoned => Colors.Gray,
            StepDisplayStatus.InProgress => Colors.Blue,
            StepDisplayStatus.Completed => Colors.Green,
            StepDisplayStatus.Failed => Colors.Red,
            StepDisplayStatus.Skipped => Colors.Gray,
            _ => Colors.Gray
        };
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts nesting level to a left margin for indentation.
/// </summary>
public class NestingLevelToMarginConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is int level)
            return new Thickness(level * 20, 0, 0, 0);
        return new Thickness(0);
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts JourneyViewMode to a boolean for visibility binding.
/// Parameter should be the target mode (e.g., "Timeline", "Tree", "Flow").
/// </summary>
public class ViewModeToVisibilityConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is JourneyViewMode mode && parameter is string targetMode)
        {
            return mode.ToString().Equals(targetMode, StringComparison.OrdinalIgnoreCase);
        }
        return false;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts JourneyViewMode to a background color for tab-style buttons.
/// Returns Primary color when selected, Transparent when not.
/// </summary>
public class ViewModeToBackgroundConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is JourneyViewMode mode && parameter is string targetMode)
        {
            var isSelected = mode.ToString().Equals(targetMode, StringComparison.OrdinalIgnoreCase);
            return isSelected ? Color.FromArgb("#512BD4") : Colors.Transparent;
        }
        return Colors.Transparent;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts JourneyViewMode to a text color for tab-style buttons.
/// Returns White when selected, Primary when not.
/// </summary>
public class ViewModeToTextColorConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is JourneyViewMode mode && parameter is string targetMode)
        {
            var isSelected = mode.ToString().Equals(targetMode, StringComparison.OrdinalIgnoreCase);
            return isSelected ? Colors.White : Color.FromArgb("#512BD4");
        }
        return Color.FromArgb("#512BD4");
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts a dictionary to a formatted string for display.
/// </summary>
public class DictionaryToStringConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is Dictionary<string, object> dict && dict.Count > 0)
        {
            return string.Join("\n", dict.Select(kvp => $"{kvp.Key}: {kvp.Value}"));
        }
        return "No data";
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// Converts a collection count to visibility (visible if count > 0).
/// </summary>
public class CountToVisibilityConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is int count)
            return count > 0;
        if (value is System.Collections.ICollection collection)
            return collection.Count > 0;
        return false;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotImplementedException();
}