using Paca.App.ViewModels;
using Paca.Core.Config;
using Xunit;

namespace Paca.Tests.Infrastructure;

public sealed class SettingsViewModelTests
{
    [Fact]
    public void LoadFromConfig_MapsAllPropertiesAccurately()
    {
        var config = new AppConfig
        {
            Theme = "light",
            AccentColor = "#2563EB",
            Concurrency = 16,
            MaxConcurrentDownloads = 5,
            OutputFolder = @"C:\Downloads\Videos",
            ToastDurationMs = 4500,
            ReduceMotion = true
        };

        var vm = new SettingsViewModel(config);

        Assert.Equal("light", vm.Theme);
        Assert.Equal("#2563EB", vm.AccentColor);
        Assert.Equal(16, vm.Concurrency);
        Assert.Equal(5, vm.MaxConcurrentDownloads);
        Assert.Equal(@"C:\Downloads\Videos", vm.OutputFolder);
        Assert.Equal(4500, vm.ToastDurationMs);
        Assert.True(vm.ReduceMotion);
        Assert.False(vm.IsDirty);
        Assert.Equal(0, vm.DirtyCount);
    }

    [Fact]
    public void PropertyChanged_TracksDirtyStateAccurately()
    {
        var config = new AppConfig();
        var vm = new SettingsViewModel(config);

        Assert.False(vm.IsDirty);

        vm.Concurrency = 32;
        Assert.True(vm.IsDirty);
        Assert.True(vm.DirtyCount >= 1);

        // 원본 값으로 복구하면 IsDirty 해제
        vm.Concurrency = config.Concurrency;
        Assert.False(vm.IsDirty);
        Assert.Equal(0, vm.DirtyCount);
    }

    [Fact]
    public void Validate_CatchesInvalidInputs()
    {
        var config = new AppConfig();
        var vm = new SettingsViewModel(config);

        Assert.True(vm.Validate());
        Assert.False(vm.HasErrors);

        // 1. 유효하지 않은 세그먼트 동시 수
        vm.Concurrency = 0;
        Assert.False(vm.Validate());
        Assert.True(vm.HasErrors);
        Assert.Contains("세그먼트", vm.ValidationSummary);

        vm.Concurrency = 8;
        Assert.True(vm.Validate());

        // 2. 유효하지 않은 토스트 지속시간
        vm.ToastDurationMs = 100;
        Assert.False(vm.Validate());
        Assert.True(vm.HasErrors);

        vm.ToastDurationMs = 3000;
        Assert.True(vm.Validate());

        // 3. 유효하지 않은 강조색 포맷
        vm.AccentColor = "InvalidHex";
        Assert.False(vm.Validate());
        Assert.True(vm.HasErrors);

        vm.AccentColor = "#6366F1";
        Assert.True(vm.Validate());

        // 4. 유효하지 않은 예약 시간 포맷
        vm.DownloadScheduleWindow = "25:99-99:00";
        Assert.False(vm.Validate());
        Assert.True(vm.HasErrors);

        vm.DownloadScheduleWindow = "02:00-08:00";
        Assert.True(vm.Validate());
    }

    [Fact]
    public void CommitToConfig_UpdatesTargetConfigCompletely()
    {
        var sourceConfig = new AppConfig();
        var vm = new SettingsViewModel(sourceConfig)
        {
            Theme = "highcontrast",
            AccentColor = "#34D399",
            Concurrency = 12,
            MaxConcurrentDownloads = 6,
            OutputFolder = @"D:\Media\Saved",
            ReduceMotion = true,
            AutoStart = true
        };

        var target = new AppConfig();
        vm.CommitToConfig(target);

        Assert.Equal("highcontrast", target.Theme);
        Assert.Equal("#34D399", target.AccentColor);
        Assert.Equal(12, target.Concurrency);
        Assert.Equal(6, target.MaxConcurrentDownloads);
        Assert.Equal(@"D:\Media\Saved", target.OutputFolder);
        Assert.True(target.ReduceMotion);
        Assert.True(target.AutoStart);
    }

    [Fact]
    public void ResetToDefaults_RestoresStandardDefaults()
    {
        var config = new AppConfig
        {
            Theme = "light",
            Concurrency = 32,
            MaxConcurrentDownloads = 10
        };

        var vm = new SettingsViewModel(config);
        vm.ResetToDefaults();

        Assert.Equal("dark", vm.Theme);
        Assert.Equal(8, vm.Concurrency);
        Assert.Equal(3, vm.MaxConcurrentDownloads);
    }
}