using System.Globalization;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media;
using SSPCTester.Logic.Models;
using SSPCTester.UI.Services;

namespace SSPCTester.UI.Converters;

/// <summary>TestStatus → 实色徽标背景。</summary>
public sealed class StatusToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        var key = value switch
        {
            true => "SuccessBrush",
            false => "DangerBrush",
            TestStatus.Pass => "SuccessBrush",
            TestStatus.Fail => "DangerBrush",
            TestStatus.Running => "RunningBrush",
            TestStatus.Measured => "PrimaryBrush",
            _ => "NeutralBrush"
        };
        return Application.Current.TryFindResource(key) as Brush ?? Brushes.Gray;
    }
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture) => Binding.DoNothing;
}

/// <summary>TestStatus → 浅色徽标背景。</summary>
public sealed class StatusToSoftBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        var key = value switch
        {
            true => "SuccessSoftBrush",
            false => "DangerSoftBrush",
            TestStatus.Pass => "SuccessSoftBrush",
            TestStatus.Fail => "DangerSoftBrush",
            TestStatus.Running => "RunningSoftBrush",
            TestStatus.Measured => "PrimarySoftBrush",
            _ => "NeutralSoftBrush"
        };
        return Application.Current.TryFindResource(key) as Brush ?? Brushes.LightGray;
    }
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture) => Binding.DoNothing;
}

/// <summary>TestStatus → 中文文本。</summary>
public sealed class StatusToTextConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
        => value is TestStatus s ? s switch
        {
            TestStatus.Pass => "合格",
            TestStatus.Fail => "不合格",
            TestStatus.Running => "测试中",
            TestStatus.Measured => "已测",
            _ => "未判定"
        } : "—";
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture) => Binding.DoNothing;
}

/// <summary>bool → Visibility（参数 "Invert" 取反）。</summary>
public sealed class BoolToVisConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        bool b = value is bool x && x;
        if (parameter is string s && s.Equals("Invert", StringComparison.OrdinalIgnoreCase)) b = !b;
        return b ? Visibility.Visible : Visibility.Collapsed;
    }
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture)
        => value is Visibility v && v == Visibility.Visible;
}

/// <summary>bool 取反；用于 IsEnabled 这类布尔属性。</summary>
public sealed class InverseBoolConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        bool b = value is bool x && x;
        return !b;
    }

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

/// <summary>null → Collapsed，非 null → Visible（参数 "Invert" 取反）。</summary>
public sealed class NullToVisConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        bool isNull = value == null;
        if (parameter is string s && s.Equals("Invert", StringComparison.OrdinalIgnoreCase)) isNull = !isNull;
        return isNull ? Visibility.Collapsed : Visibility.Visible;
    }
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture) => Binding.DoNothing;
}

/// <summary>UiLogLevel → 颜色。</summary>
public sealed class LogLevelToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        var key = value is UiLogLevel l ? l switch
        {
            UiLogLevel.Success => "SuccessBrush",
            UiLogLevel.Warning => "WarningBrush",
            UiLogLevel.Error => "DangerBrush",
            _ => "TextPrimaryBrush"
        } : "TextPrimaryBrush";
        return Application.Current.TryFindResource(key) as Brush ?? Brushes.Black;
    }
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture) => Binding.DoNothing;
}

/// <summary>数值 → "—"（NaN/0 时）或格式化字符串。参数为 .NET 格式串（如 "F2"）。</summary>
public sealed class NumberOrDashConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value is double d)
        {
            if (double.IsNaN(d)) return "—";
            return d.ToString(parameter as string ?? "F2", CultureInfo.InvariantCulture);
        }
        return "—";
    }
    public object ConvertBack(object value, Type targetType, object? parameter, CultureInfo culture) => Binding.DoNothing;
}