using System.Text.Json;
using FluentAssertions;
using AxCopilot.Models;
using Xunit;

namespace AxCopilot.Tests.Services;

public class SettingsServiceTests
{
    // ─── AppSettings 기본값 ──────────────────────────────────────────────────

    [Fact]
    public void AppSettings_DefaultHotkey_IsAltSpace()
    {
        new AppSettings().Hotkey.Should().Be("Alt+Space");
    }

    [Fact]
    public void LauncherSettings_DefaultMaxResults_IsSeven()
    {
        new LauncherSettings().MaxResults.Should().Be(7);
    }

    [Fact]
    public void LauncherSettings_DefaultTheme_IsSystem()
    {
        new LauncherSettings().Theme.Should().Be("system");
    }

    [Fact]
    public void LauncherSettings_DefaultOpacity_IsValid()
    {
        var opacity = new LauncherSettings().Opacity;
        opacity.Should().BeInRange(0.0, 1.0);
    }

    [Fact]
    public void LauncherSettings_DefaultBrowserSessionRestore_IsEnabled()
    {
        new LauncherSettings().EnableBrowserSessionRestore.Should().BeTrue();
    }

    [Fact]
    public void LauncherSettings_DefaultAdaptiveWorkspaceRestoreThrottle_IsEnabled()
    {
        new LauncherSettings().EnableAdaptiveWorkspaceRestoreThrottle.Should().BeTrue();
    }

    [Fact]
    public void LauncherSettings_DefaultWorkspaceRestoreDelayRange_IsValid()
    {
        var settings = new LauncherSettings();

        settings.WorkspaceRestoreBaseDelayMs.Should().Be(250);
        settings.WorkspaceRestoreMaxDelayMs.Should().BeGreaterOrEqualTo(settings.WorkspaceRestoreBaseDelayMs);
    }

    [Fact]
    public void AppSettings_DefaultMonitorMismatch_IsWarn()
    {
        new AppSettings().MonitorMismatch.Should().Be("warn");
    }

    [Fact]
    public void AppSettings_DefaultCleanupPeriodDays_IsThirty()
    {
        new AppSettings().CleanupPeriodDays.Should().Be(30);
    }

    [Fact]
    public void AppSettings_DefaultIndexPaths_NotEmpty()
    {
        new AppSettings().IndexPaths.Should().NotBeEmpty();
    }

    [Fact]
    public void LlmSettings_DefaultMaxContextTokens_IsAuto()
    {
        new LlmSettings().MaxContextTokens.Should().Be(0);
    }

    // ─── LauncherSettings 테마 ───────────────────────────────────────────────

    [Theory]
    [InlineData("system")]
    [InlineData("dark")]
    [InlineData("light")]
    public void LauncherSettings_Theme_AcceptsValidValues(string theme)
    {
        var settings = new LauncherSettings { Theme = theme };
        settings.Theme.Should().Be(theme);
    }

    // ─── JSON 직렬화 라운드트립 ──────────────────────────────────────────────

    [Fact]
    public void AppSettings_Serialization_PreservesHotkey()
    {
        var original = new AppSettings { Hotkey = "Ctrl+Space" };
        var restored = RoundTrip(original);
        restored.Hotkey.Should().Be("Ctrl+Space");
    }

    [Fact]
    public void AppSettings_Serialization_PreservesTheme()
    {
        var original = new AppSettings
        {
            Launcher = new LauncherSettings { Theme = "dark" }
        };
        var restored = RoundTrip(original);
        restored.Launcher.Theme.Should().Be("dark");
    }

    [Fact]
    public void AppSettings_Serialization_PreservesMaxResults()
    {
        var original = new AppSettings
        {
            Launcher = new LauncherSettings { MaxResults = 15 }
        };
        var restored = RoundTrip(original);
        restored.Launcher.MaxResults.Should().Be(15);
    }

    [Fact]
    public void AppSettings_Serialization_PreservesAliases()
    {
        var original = new AppSettings
        {
            Aliases =
            [
                new() { Key = "@test", Type = "url", Target = "https://example.com" }
            ]
        };
        var restored = RoundTrip(original);
        restored.Aliases.Should().HaveCount(1);
        restored.Aliases[0].Key.Should().Be("@test");
        restored.Aliases[0].Target.Should().Be("https://example.com");
    }

    [Fact]
    public void AppSettings_Serialization_PreservesCleanupPeriodDays()
    {
        var original = new AppSettings { CleanupPeriodDays = 14 };

        var restored = RoundTrip(original);

        restored.CleanupPeriodDays.Should().Be(14);
    }

    // ─── AliasEntry ──────────────────────────────────────────────────────────

    [Fact]
    public void AliasEntry_DefaultShowWindow_IsFalse()
    {
        new AliasEntry().ShowWindow.Should().BeFalse();
    }

    [Theory]
    [InlineData("url")]
    [InlineData("folder")]
    [InlineData("app")]
    [InlineData("batch")]
    [InlineData("api")]
    [InlineData("clipboard")]
    public void AliasEntry_Type_AcceptsAllTypes(string type)
    {
        var entry = new AliasEntry { Type = type };
        entry.Type.Should().Be(type);
    }

    // ─── WorkspaceProfile / WindowSnapshot ───────────────────────────────────

    [Fact]
    public void WorkspaceProfile_DefaultWindows_IsEmpty()
    {
        new WorkspaceProfile().Windows.Should().BeEmpty();
    }

    [Fact]
    public void WindowSnapshot_DefaultShowCmd_IsNormal()
    {
        new WindowSnapshot().ShowCmd.Should().Be("Normal");
    }

    [Fact]
    public void WindowSnapshot_DefaultMonitor_IsZero()
    {
        new WindowSnapshot().Monitor.Should().Be(0);
    }

    [Fact]
    public void WindowRect_DefaultValues_AreZero()
    {
        var rect = new WindowRect();
        rect.X.Should().Be(0);
        rect.Y.Should().Be(0);
        rect.Width.Should().Be(0);
        rect.Height.Should().Be(0);
    }

    [Fact]
    public void WorkspaceProfile_Serialization_RoundTrip()
    {
        var profile = new WorkspaceProfile
        {
            Name = "작업 프로필",
            Windows =
            [
                new() { Exe = "notepad.exe", ShowCmd = "Maximized", Monitor = 1 }
            ]
        };
        var json = JsonSerializer.Serialize(profile, JsonOptions);
        var restored = JsonSerializer.Deserialize<WorkspaceProfile>(json, JsonOptions)!;

        restored.Name.Should().Be("작업 프로필");
        restored.Windows.Should().HaveCount(1);
        restored.Windows[0].Exe.Should().Be("notepad.exe");
        restored.Windows[0].ShowCmd.Should().Be("Maximized");
        restored.Windows[0].Monitor.Should().Be(1);
    }

    [Fact]
    public void WorkspaceProfile_Serialization_PreservesBrowserState()
    {
        var profile = new WorkspaceProfile
        {
            Name = "브라우저 프로필",
            Windows =
            [
                new()
                {
                    Exe = "msedge.exe",
                    Title = "업무 포털 - Microsoft Edge",
                    Browser = new BrowserWindowState
                    {
                        Kind = "edge",
                        UserDataDir = @"C:\Users\tester\AppData\Local\Microsoft\Edge\User Data",
                        ProfileDirectory = "Profile 3",
                        ActiveUrl = "https://portal.example.com",
                        ActiveTabIndex = 1,
                        TabUrls = ["https://mail.example.com", "https://portal.example.com"]
                    }
                }
            ]
        };

        var json = JsonSerializer.Serialize(profile, JsonOptions);
        var restored = JsonSerializer.Deserialize<WorkspaceProfile>(json, JsonOptions)!;

        restored.Windows.Should().HaveCount(1);
        restored.Windows[0].Browser.Should().NotBeNull();
        restored.Windows[0].Browser!.Kind.Should().Be("edge");
        restored.Windows[0].Browser!.ProfileDirectory.Should().Be("Profile 3");
        restored.Windows[0].Browser!.ActiveTabIndex.Should().Be(1);
        restored.Windows[0].Browser!.TabUrls.Should().ContainInOrder(
            "https://mail.example.com",
            "https://portal.example.com");
    }

    [Fact]
    public void WorkspaceProfile_Serialization_PreservesAppState()
    {
        var profile = new WorkspaceProfile
        {
            Name = "앱 상태 프로필",
            Windows =
            [
                new()
                {
                    Exe = "explorer.exe",
                    Title = "문서 - 파일 탐색기",
                    AppState = new AppWindowState
                    {
                        Kind = "explorer",
                        PrimaryPath = @"C:\Docs",
                        ActivePathIndex = 0,
                        Paths = [@"C:\Docs", @"C:\Docs\Archive"]
                    }
                }
            ]
        };

        var json = JsonSerializer.Serialize(profile, JsonOptions);
        var restored = JsonSerializer.Deserialize<WorkspaceProfile>(json, JsonOptions)!;

        restored.Windows.Should().HaveCount(1);
        restored.Windows[0].AppState.Should().NotBeNull();
        restored.Windows[0].AppState!.Kind.Should().Be("explorer");
        restored.Windows[0].AppState!.PrimaryPath.Should().Be(@"C:\Docs");
        restored.Windows[0].AppState!.Paths.Should().ContainInOrder(@"C:\Docs", @"C:\Docs\Archive");
    }

    // ─── ClipboardTransformer ────────────────────────────────────────────────

    [Fact]
    public void ClipboardTransformer_DefaultTimeout_IsFiveSeconds()
    {
        new ClipboardTransformer().Timeout.Should().Be(5000);
    }

    [Fact]
    public void ClipboardTransformer_DefaultType_IsRegex()
    {
        new ClipboardTransformer().Type.Should().Be("regex");
    }

    [Fact]
    public void NormalizeLlmThresholds_ClampsConfiguredValues()
    {
        var llm = new LlmSettings
        {
            ReadOnlySignatureLoopThreshold = 1,
            ReadOnlyStagnationThreshold = 99,
            NoProgressRecoveryThreshold = 2,
            NoProgressAbortThreshold = 200,
            NoProgressRecoveryMaxRetries = 9,
            ToolExecutionTimeoutMs = 1000
        };

        InvokeNormalizeLlmThresholds(llm);

        llm.ReadOnlySignatureLoopThreshold.Should().Be(2);
        llm.ReadOnlyStagnationThreshold.Should().Be(20);
        llm.NoProgressRecoveryThreshold.Should().Be(4);
        llm.NoProgressAbortThreshold.Should().Be(50);
        llm.NoProgressRecoveryMaxRetries.Should().Be(5);
        llm.ToolExecutionTimeoutMs.Should().Be(5000);
    }

    [Fact]
    public void NormalizeLlmThresholds_PreservesZeroAsUnset()
    {
        var llm = new LlmSettings
        {
            ReadOnlySignatureLoopThreshold = 0,
            ReadOnlyStagnationThreshold = 0,
            NoProgressRecoveryThreshold = 0,
            NoProgressAbortThreshold = 0,
            NoProgressRecoveryMaxRetries = 0,
            ToolExecutionTimeoutMs = 0
        };

        InvokeNormalizeLlmThresholds(llm);

        llm.ReadOnlySignatureLoopThreshold.Should().Be(0);
        llm.ReadOnlyStagnationThreshold.Should().Be(0);
        llm.NoProgressRecoveryThreshold.Should().Be(0);
        llm.NoProgressAbortThreshold.Should().Be(0);
        llm.NoProgressRecoveryMaxRetries.Should().Be(0);
        llm.ToolExecutionTimeoutMs.Should().Be(0);
    }

    // ─── Helpers ─────────────────────────────────────────────────────────────

    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        WriteIndented = false,
        PropertyNameCaseInsensitive = true
    };

    private static AppSettings RoundTrip(AppSettings original)
    {
        var json = JsonSerializer.Serialize(original, JsonOptions);
        return JsonSerializer.Deserialize<AppSettings>(json, JsonOptions)!;
    }

    private static void InvokeNormalizeLlmThresholds(LlmSettings llm)
    {
        var method = typeof(AxCopilot.Services.SettingsService)
            .GetMethod("NormalizeLlmThresholds", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
        method.Should().NotBeNull();
        method!.Invoke(null, [llm]);
    }
}