using System.IO;
using System.Text;
using System.Text.Json;
using SharepointToolbox.Core.Models;
using SharepointToolbox.Infrastructure.Persistence;

namespace SharepointToolbox.Tests.Services;

[Trait("Category", "Unit")]
public class BrandingRepositoryTests : IDisposable
{
    private readonly string _tempFile;

    public BrandingRepositoryTests()
    {
        _tempFile = Path.GetTempFileName();
        File.Delete(_tempFile);
    }

    public void Dispose()
    {
        if (File.Exists(_tempFile)) File.Delete(_tempFile);
        if (File.Exists(_tempFile + ".tmp")) File.Delete(_tempFile + ".tmp");
    }

    private BrandingRepository CreateRepository() => new(_tempFile);

    [Fact]
    public async Task LoadAsync_MissingFile_ReturnsDefaultBrandingSettings()
    {
        var repo = CreateRepository();

        var settings = await repo.LoadAsync();

        Assert.Null(settings.MspLogo);
    }

    [Fact]
    public async Task SaveAndLoad_RoundTrips_MspLogo()
    {
        var repo = CreateRepository();
        var logo = new LogoData { Base64 = "abc123==", MimeType = "image/png" };
        var original = new BrandingSettings { MspLogo = logo };

        await repo.SaveAsync(original);
        var loaded = await repo.LoadAsync();

        Assert.NotNull(loaded.MspLogo);
        Assert.Equal("abc123==", loaded.MspLogo.Base64);
        Assert.Equal("image/png", loaded.MspLogo.MimeType);
    }

    [Fact]
    public async Task SaveAsync_CreatesDirectoryIfNotExists()
    {
        var tempDir = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName(), "subdir");
        var filePath = Path.Combine(tempDir, "branding.json");
        var repo = new BrandingRepository(filePath);

        try
        {
            await repo.SaveAsync(new BrandingSettings());
            Assert.True(File.Exists(filePath), "File must be created even when directory did not exist");
        }
        finally
        {
            if (File.Exists(filePath)) File.Delete(filePath);
            if (Directory.Exists(tempDir)) Directory.Delete(tempDir, recursive: true);
        }
    }

    [Fact]
    public async Task TenantProfile_WithClientLogo_SerializesAndDeserializesCorrectly()
    {
        var logo = new LogoData { Base64 = "xyz==", MimeType = "image/jpeg" };
        var profile = new TenantProfile
        {
            Name = "Contoso",
            TenantUrl = "https://contoso.sharepoint.com",
            ClientId = "client-id-123",
            ClientLogo = logo
        };

        var options = new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            WriteIndented = true
        };
        var json = JsonSerializer.Serialize(profile, options);

        // Verify camelCase key exists
        using var doc = JsonDocument.Parse(json);
        Assert.True(doc.RootElement.TryGetProperty("clientLogo", out var clientLogoElem),
            "JSON must contain 'clientLogo' key (camelCase)");
        Assert.Equal(JsonValueKind.Object, clientLogoElem.ValueKind);

        // Deserialize back
        var readOptions = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
        var loaded = JsonSerializer.Deserialize<TenantProfile>(json, readOptions);

        Assert.NotNull(loaded?.ClientLogo);
        Assert.Equal("xyz==", loaded.ClientLogo.Base64);
        Assert.Equal("image/jpeg", loaded.ClientLogo.MimeType);
    }

    [Fact]
    public async Task TenantProfile_WithoutClientLogo_SerializesWithNullAndDeserializesWithNull()
    {
        var profile = new TenantProfile
        {
            Name = "Fabrikam",
            TenantUrl = "https://fabrikam.sharepoint.com",
            ClientId = "client-id-456"
        };

        var options = new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            WriteIndented = true
        };
        var json = JsonSerializer.Serialize(profile, options);

        // Deserialize back — ClientLogo should be null (forward compatible)
        var readOptions = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
        var loaded = JsonSerializer.Deserialize<TenantProfile>(json, readOptions);

        Assert.NotNull(loaded);
        Assert.Null(loaded.ClientLogo);
    }
}
