using System.Net;
using System.Text.Json;
using ItWorx.KnowledgeHub.IntegrationTests.Infrastructure;

namespace ItWorx.KnowledgeHub.IntegrationTests.Platform;

[Collection(PostgresTestGroup.Name)]
public sealed class UserPreferencesApiTests(PostgresContainerFixture postgres) : OwnerSetupTestBase(postgres)
{
    private sealed record PreferencesPayload(
        string Theme,
        string Density,
        bool PrimaryNavigationCollapsed,
        bool ContextPanelOpen,
        string[] NavigationOrder,
        string[] DashboardWidgetOrder,
        string[] HiddenDashboardWidgets,
        string DefaultLandingPage,
        string CatalogView,
        int ContextPanelWidth,
        int NavigationWidth);

    private static PreferencesPayload DefaultPreferences(string theme = "system") => new(
        theme,
        "comfortable",
        false,
        false,
        ["/", "/infrastructure", "/infrastructure/services", "/projects", "/runbooks", "/knowledge", "/activity", "/search"],
        ["attention", "server", "projects", "activity", "runbooks", "favorites", "quick-actions"],
        [],
        "/",
        "list",
        304,
        224);

    private async Task<HttpClient> AuthenticatedClientAsync()
    {
        var client = Factory.CreateClient();
        await SetupHelper.LoginAsync(client, OwnerEmail, OwnerPassword);
        return client;
    }

    [Fact]
    public async Task Missing_preferences_return_the_shared_defaults_without_persisting_a_row()
    {
        using var client = await AuthenticatedClientAsync();

        using var first = await client.GetAsync("/api/v1/me/preferences");
        using var firstJson = JsonDocument.Parse(await first.Content.ReadAsStringAsync());
        using var second = await client.GetAsync("/api/v1/me/preferences");
        using var secondJson = JsonDocument.Parse(await second.Content.ReadAsStringAsync());

        Assert.Equal(HttpStatusCode.OK, first.StatusCode);
        Assert.Equal("\"0\"", first.Headers.ETag?.Tag);
        Assert.Equal("0", firstJson.RootElement.GetProperty("eTag").GetString());
        Assert.True(firstJson.RootElement.GetProperty("isDefault").GetBoolean());
        Assert.Equal(1, firstJson.RootElement.GetProperty("schemaVersion").GetInt32());
        Assert.Equal("system", firstJson.RootElement.GetProperty("theme").GetString());
        Assert.Equal("comfortable", firstJson.RootElement.GetProperty("density").GetString());
        Assert.Equal(304, firstJson.RootElement.GetProperty("contextPanelWidth").GetInt32());
        Assert.Equal(224, firstJson.RootElement.GetProperty("navigationWidth").GetInt32());
        Assert.Equal("0", secondJson.RootElement.GetProperty("eTag").GetString());
        Assert.True(secondJson.RootElement.GetProperty("isDefault").GetBoolean());
    }

    [Fact]
    public async Task Full_replacement_with_the_current_etag_persists_for_the_signed_in_user()
    {
        using var client = await AuthenticatedClientAsync();
        var request = new PreferencesPayload(
            "dark", "compact", true, true,
            ["/projects", "/", "/knowledge"], ["projects", "attention", "server"], ["server"],
            "/projects", "grid", 420, 248);

        using var updated = await SetupHelper.PutWithCsrfAsync(client, "/api/v1/me/preferences", request, "0");
        using var updatedJson = JsonDocument.Parse(await updated.Content.ReadAsStringAsync());
        using var fetched = await client.GetAsync("/api/v1/me/preferences");
        using var fetchedJson = JsonDocument.Parse(await fetched.Content.ReadAsStringAsync());

        Assert.Equal(HttpStatusCode.OK, updated.StatusCode);
        Assert.Equal("\"1\"", updated.Headers.ETag?.Tag);
        Assert.Equal("1", updatedJson.RootElement.GetProperty("eTag").GetString());
        Assert.False(updatedJson.RootElement.GetProperty("isDefault").GetBoolean());
        Assert.Equal("dark", fetchedJson.RootElement.GetProperty("theme").GetString());
        Assert.Equal("/projects", fetchedJson.RootElement.GetProperty("defaultLandingPage").GetString());
        Assert.Equal(420, fetchedJson.RootElement.GetProperty("contextPanelWidth").GetInt32());
        Assert.Equal("1", fetchedJson.RootElement.GetProperty("eTag").GetString());
    }

    [Fact]
    public async Task A_missing_if_match_is_rejected_before_updating_preferences()
    {
        using var client = await AuthenticatedClientAsync();
        var request = DefaultPreferences("light");

        using var response = await SetupHelper.PutWithCsrfAsync(client, "/api/v1/me/preferences", request);

        Assert.Equal((HttpStatusCode)428, response.StatusCode);
    }

    [Fact]
    public async Task A_stale_if_match_is_rejected_without_overwriting_a_newer_preference_version()
    {
        using var client = await AuthenticatedClientAsync();
        var request = DefaultPreferences("dark");

        using var first = await SetupHelper.PutWithCsrfAsync(client, "/api/v1/me/preferences", request, "0");
        using var stale = await SetupHelper.PutWithCsrfAsync(client, "/api/v1/me/preferences", request with { Theme = "light" }, "0");
        using var fetched = await client.GetAsync("/api/v1/me/preferences");
        using var fetchedJson = JsonDocument.Parse(await fetched.Content.ReadAsStringAsync());

        Assert.Equal(HttpStatusCode.OK, first.StatusCode);
        Assert.Equal(HttpStatusCode.PreconditionFailed, stale.StatusCode);
        Assert.Equal("dark", fetchedJson.RootElement.GetProperty("theme").GetString());
    }

    [Fact]
    public async Task Preferences_reject_unknown_navigation_and_widget_ids()
    {
        using var client = await AuthenticatedClientAsync();
        var request = DefaultPreferences() with
        {
            NavigationOrder = ["/admin/users/delete"],
            DashboardWidgetOrder = ["unexpected-widget"],
            DefaultLandingPage = "/admin/users/delete"
        };

        using var response = await SetupHelper.PutWithCsrfAsync(client, "/api/v1/me/preferences", request, "0");

        Assert.Equal(HttpStatusCode.UnprocessableEntity, response.StatusCode);
    }

    [Fact]
    public async Task Concurrent_first_writes_with_the_default_etag_have_one_winner()
    {
        using var firstClient = await AuthenticatedClientAsync();
        using var secondClient = await AuthenticatedClientAsync();
        var firstWrite = SetupHelper.PutWithCsrfAsync(firstClient, "/api/v1/me/preferences", DefaultPreferences("dark"), "0");
        var secondWrite = SetupHelper.PutWithCsrfAsync(secondClient, "/api/v1/me/preferences", DefaultPreferences("light"), "0");

        using var firstResponse = await firstWrite;
        using var secondResponse = await secondWrite;

        Assert.Equal(1, new[] { firstResponse.StatusCode, secondResponse.StatusCode }.Count(status => status == HttpStatusCode.OK));
        Assert.Equal(1, new[] { firstResponse.StatusCode, secondResponse.StatusCode }.Count(status => status == HttpStatusCode.PreconditionFailed));
    }
}