// Copyright (C) 2026 SharpEmu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

using SharpEmu.GUI;
using Xunit;

namespace SharpEmu.Libs.Tests.GUI;

public sealed class GuiSettingsTests
{
    [Fact]
    public void NormalizeFromJson_AllPropertiesNull_FallsBackToDefaults()
    {
        const string json = """
            {
              "LogLevel": null,
              "GameFolders": null,
              "ExcludedGames": null,
              "EnvironmentToggles": null,
              "Language": null,
              "DiscordClientId": null
            }
            """;

        var settings = GuiSettings.NormalizeFromJson(json);

        Assert.Equal("Info", settings.LogLevel);
        Assert.Equal("en", settings.Language);
        Assert.Equal("1525606762248540221", settings.DiscordClientId);
        Assert.Empty(settings.GameFolders);
        Assert.Empty(settings.ExcludedGames);
        Assert.Empty(settings.EnvironmentToggles);
        Assert.Equal("Windowed", settings.WindowMode);
        Assert.Equal("1920x1080", settings.Resolution);
        Assert.Equal("Fit", settings.ScalingMode);
        Assert.Equal("Auto", settings.HdrMode);
        Assert.True(settings.VSync);
    }

    [Fact]
    public void NormalizeFromJson_InvalidVideoValues_FallBackAndClamp()
    {
        const string json = """
            {
              "WindowMode": "not-a-mode",
              "Resolution": "not-a-resolution",
              "ScalingMode": "nearest-ish",
              "HdrMode": "maybe",
              "DisplayIndex": -4,
              "RefreshRate": 5000
            }
            """;

        var settings = GuiSettings.NormalizeFromJson(json);

        Assert.Equal("Windowed", settings.WindowMode);
        Assert.Equal("1920x1080", settings.Resolution);
        Assert.Equal("Fit", settings.ScalingMode);
        Assert.Equal("Auto", settings.HdrMode);
        Assert.Equal(0, settings.DisplayIndex);
        Assert.Equal(1000, settings.RefreshRate);
    }

    [Fact]
    public void NormalizeFromJson_CustomResolution_IsPreserved()
    {
        const string json = """{ "Resolution": "3440x1440" }""";

        var settings = GuiSettings.NormalizeFromJson(json);

        Assert.Equal("3440x1440", settings.Resolution);
    }

    [Fact]
    public void NormalizeFromJson_ValidValues_ArePreserved()
    {
        const string json = """
            {
              "LogLevel": "Debug",
              "GameFolders": ["C:\\Games"],
              "ExcludedGames": ["C:\\Games\\skip.bin"],
              "EnvironmentToggles": ["SHARPEMU_TRACE"],
              "Language": "pt-BR",
              "DiscordClientId": "999"
            }
            """;

        var settings = GuiSettings.NormalizeFromJson(json);

        Assert.Equal("Debug", settings.LogLevel);
        Assert.Equal("pt-BR", settings.Language);
        Assert.Equal("999", settings.DiscordClientId);
        Assert.Equal(["C:\\Games"], settings.GameFolders);
        Assert.Equal(["C:\\Games\\skip.bin"], settings.ExcludedGames);
        Assert.Equal(["SHARPEMU_TRACE"], settings.EnvironmentToggles);
    }

    // An empty Discord client ID intentionally disables Rich Presence.
    [Fact]
    public void NormalizeFromJson_EmptyDiscordClientId_IsPreservedNotNormalized()
    {
        const string json = """{ "DiscordClientId": "" }""";

        var settings = GuiSettings.NormalizeFromJson(json);

        Assert.Equal(string.Empty, settings.DiscordClientId);
    }

    [Fact]
    public void NormalizeFromJson_NullOrEmptyListEntries_AreFilteredOut()
    {
        const string json = """
            {
              "GameFolders": ["C:\\Games", null, ""],
              "ExcludedGames": [null],
              "EnvironmentToggles": [null, "SHARPEMU_TRACE", ""]
            }
            """;

        var settings = GuiSettings.NormalizeFromJson(json);

        Assert.Equal(["C:\\Games"], settings.GameFolders);
        Assert.Empty(settings.ExcludedGames);
        Assert.Equal(["SHARPEMU_TRACE"], settings.EnvironmentToggles);
    }

    [Fact]
    public void NormalizeFromJson_EmptyObject_UsesConstructorDefaults()
    {
        var settings = GuiSettings.NormalizeFromJson("{}");

        Assert.Equal("Info", settings.LogLevel);
        Assert.Equal("en", settings.Language);
        Assert.Equal("1525606762248540221", settings.DiscordClientId);
        Assert.Empty(settings.GameFolders);
        Assert.Empty(settings.ExcludedGames);
        Assert.Empty(settings.EnvironmentToggles);
    }

    [Fact]
    public void EffectiveLaunchSettings_PerGameVideoValuesOverrideOnlySelectedFields()
    {
        var global = new GuiSettings
        {
            WindowMode = "Windowed",
            Resolution = "1920x1080",
            DisplayIndex = 1,
            RefreshRate = 60,
            ScalingMode = "Fit",
            HdrMode = "Auto",
            VSync = true,
        };
        var perGame = new PerGameSettings
        {
            Resolution = "2560x1440",
            DisplayIndex = 2,
            HdrMode = "On",
            VSync = false,
        };

        var effective = EffectiveLaunchSettings.Resolve(global, perGame);

        Assert.Equal("Windowed", effective.WindowMode);
        Assert.Equal("2560x1440", effective.Resolution);
        Assert.Equal(2, effective.DisplayIndex);
        Assert.Equal(60, effective.RefreshRate);
        Assert.Equal("Fit", effective.ScalingMode);
        Assert.Equal("On", effective.HdrMode);
        Assert.False(effective.VSync);
    }

    [Fact]
    public void PerGameSettings_VideoOverridesParticipateInEmptyCheck()
    {
        Assert.True(new PerGameSettings().IsEmpty);
        Assert.False(new PerGameSettings { ScalingMode = "Integer" }.IsEmpty);
        Assert.False(new PerGameSettings { HdrMode = "Off" }.IsEmpty);
    }
}