using System.Text;
using System.Text.Json;
using Omika.Core.Services.Mobile;

namespace Omika.Tests.Mobile;

/// <summary>
/// Tests du TokenExpirationReader : lecture NON autoritative de l'expiration
/// depuis le payload, sans vérification de signature.
/// </summary>
public class TokenExpirationReaderTests
{
    private static readonly DateTimeOffset Now = new(2026, 9, 29, 12, 0, 0, TimeSpan.Zero);

    private static string Token(long expiresAtUtc)
        => Base64Url(JsonSerializer.SerializeToUtf8Bytes(new { ExpiresAtUtc = expiresAtUtc })) + ".signature-ignored";

    private static string Base64Url(byte[] data)
        => Convert.ToBase64String(data).TrimEnd('=').Replace('+', '-').Replace('/', '_');

    [Fact]
    public void ExpirationFuture_NestPasExpire()
    {
        string token = Token(Now.AddMinutes(5).ToUnixTimeSeconds());

        Assert.False(TokenExpirationReader.IsExpired(token, Now));
    }

    [Fact]
    public void ExpirationPassee_EstExpire()
    {
        string token = Token(Now.AddSeconds(-1).ToUnixTimeSeconds());

        Assert.True(TokenExpirationReader.IsExpired(token, Now));
    }

    [Fact]
    public void BoundaryExactNow_NestPasExpire_StrictementInferieur()
    {
        // Le serveur utilise ExpiresAtUtc < now (strict). À l'instant exact,
        // le token n'est PAS encore expiré.
        string token = Token(Now.ToUnixTimeSeconds());

        Assert.False(TokenExpirationReader.IsExpired(token, Now));
    }

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    [InlineData("pas-de-point")]
    [InlineData("a.b.c")]
    [InlineData("!base64-invalide!.sig")]
    [InlineData("eyJmb28iOiJiYXIifQ==.sig")] // payload sans ExpiresAtUtc
    public void FormatInvalide_RetourneNullEtNonExpire(string? token)
    {
        Assert.Null(TokenExpirationReader.TryReadExpiresAtUtc(token));
        Assert.False(TokenExpirationReader.IsExpired(token, Now));
    }

    [Fact]
    public void LitExpirationSansVerifierSignature()
    {
        string token = Token(Now.AddHours(2).ToUnixTimeSeconds());

        DateTimeOffset? expires = TokenExpirationReader.TryReadExpiresAtUtc(token);

        Assert.NotNull(expires);
        Assert.Equal(Now.AddHours(2).ToUnixTimeSeconds(), expires!.Value.ToUnixTimeSeconds());
    }
}