using System.IdentityModel.Tokens.Jwt;
using System.Net;
using System.Net.Http.Json;
using System.Security.Claims;
using System.Text;
using System.Text.Json;
using Azaion.E2E.Helpers;
using FluentAssertions;
using Microsoft.IdentityModel.Tokens;
using Xunit;

namespace Azaion.E2E.Tests;

[Collection("E2E")]
public sealed class SecurityTests
{
    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase
    };

    private static readonly JsonSerializerOptions ResponseJsonOptions = new()
    {
        PropertyNameCaseInsensitive = true
    };

    private sealed record ErrorResponse(int ErrorCode, string Message);

    private readonly TestFixture _fixture;

    public SecurityTests(TestFixture fixture) => _fixture = fixture;

    [Fact]
    public async Task Unauthenticated_requests_to_protected_endpoints_return_401()
    {
        // Arrange
        var baseUrl = _fixture.Settings.ApiBaseUrl;
        using var bare = new HttpClient { BaseAddress = new Uri(baseUrl, UriKind.Absolute), Timeout = TimeSpan.FromMinutes(5) };
        using var client = new ApiClient(bare, disposeClient: false);
        var probeEmail = "test@x.com";

        // Act & Assert
        using (var r = await client.GetAsync("/users/current"))
            r.StatusCode.Should().Be(HttpStatusCode.Unauthorized);

        using (var r = await client.GetAsync("/users"))
            r.StatusCode.Should().Be(HttpStatusCode.Unauthorized);

        using (var r = await bare.PostAsync("/users",
                new StringContent("", Encoding.UTF8, "application/json")))
            r.StatusCode.Should().Be(HttpStatusCode.Unauthorized);

        using (var r = await client.PutAsync($"/users/{Uri.EscapeDataString(probeEmail)}/enable"))
            r.StatusCode.Should().Be(HttpStatusCode.Unauthorized);

        using (var r = await client.DeleteAsync($"/users/{Uri.EscapeDataString(probeEmail)}"))
            r.StatusCode.Should().Be(HttpStatusCode.Unauthorized);

        using (var r = await client.PostAsync("/resources/get",
                new { password = "irrelevant1", hardware = "h", fileName = "f.bin" }))
            r.StatusCode.Should().Be(HttpStatusCode.Unauthorized);
    }

    [Fact]
    public async Task Non_admin_uploader_is_forbidden_on_admin_endpoints()
    {
        // Arrange
        using var client = _fixture.CreateApiClient();
        using var login = await client.PostAsync("/login",
            new { email = _fixture.UploaderEmail, password = _fixture.UploaderPassword });
        login.StatusCode.Should().Be(HttpStatusCode.OK);
        var loginBody = await login.Content.ReadFromJsonAsync<LoginTokenResponse>(JsonOptions);
        var token = loginBody?.Token ?? throw new InvalidOperationException("Missing token.");
        client.SetAuthToken(token);
        var targetEmail = $"{Guid.NewGuid():N}@sectest.example.com";

        // Act & Assert
        using (var r = await client.PostAsync("/users",
                new { email = targetEmail, password = "TestPwd12345", role = 10 }))
            r.StatusCode.Should().Be(HttpStatusCode.Forbidden);

        using (var r = await client.GetAsync("/users"))
            r.StatusCode.Should().Be(HttpStatusCode.Forbidden);

        using (var r = await client.PutAsync($"/users/{Uri.EscapeDataString(targetEmail)}/set-role/10"))
            r.StatusCode.Should().Be(HttpStatusCode.Forbidden);

        using (var r = await client.DeleteAsync($"/users/{Uri.EscapeDataString(targetEmail)}"))
            r.StatusCode.Should().Be(HttpStatusCode.Forbidden);
    }

    [Fact]
    public async Task Users_list_must_not_expose_non_empty_password_hash_in_json()
    {
        // Arrange
        using var client = _fixture.CreateAuthenticatedClient(_fixture.AdminToken);

        // Act
        using var response = await client.GetAsync("/users");
        var json = await response.Content.ReadAsStringAsync();

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        using var doc = JsonDocument.Parse(json);
        doc.RootElement.ValueKind.Should().Be(JsonValueKind.Array);
        foreach (var user in doc.RootElement.EnumerateArray())
        {
            if (!user.TryGetProperty("passwordHash", out var ph))
                continue;
            if (ph.ValueKind == JsonValueKind.Null)
                continue;
            ph.ValueKind.Should().Be(JsonValueKind.String);
            (ph.GetString() ?? "").Should().BeEmpty("password hash must not be exposed in API responses");
        }
    }

    [Fact]
    public async Task Expired_jwt_is_rejected_for_admin_endpoint()
    {
        // Arrange
        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_fixture.JwtSecret));
        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256Signature);
        var token = new JwtSecurityToken(
            issuer: "AzaionApi",
            audience: "Annotators/OrangePi/Admins",
            claims:
            [
                new Claim(ClaimTypes.Role, "ApiAdmin"),
                new Claim("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress", "expired@x.com")
            ],
            notBefore: DateTime.UtcNow.AddHours(-3),
            expires: DateTime.UtcNow.AddHours(-1),
            signingCredentials: creds);
        var jwt = new JwtSecurityTokenHandler().WriteToken(token);
        using var client = _fixture.CreateAuthenticatedClient(jwt);

        // Act
        using var response = await client.GetAsync("/users");

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.Unauthorized);
    }

    [Fact]
    public async Task Per_user_encryption_produces_distinct_ciphertext_for_same_file()
    {
        // Arrange
        var folder = $"sectest-{Guid.NewGuid():N}";
        var fileName = $"enc-{Guid.NewGuid():N}.bin";
        var payload = Encoding.UTF8.GetBytes($"secret-{Guid.NewGuid()}");
        var email1 = $"{Guid.NewGuid():N}@sectest.example.com";
        var email2 = $"{Guid.NewGuid():N}@sectest.example.com";
        const string password = "TestPwd12345";
        var hw1 = $"hw-{Guid.NewGuid():N}";
        var hw2 = $"hw-{Guid.NewGuid():N}";

        try
        {
            foreach (var email in new[] { email1, email2 })
            {
                var reg = JsonSerializer.Serialize(new { email, password, role = 10 }, JsonOptions);
                using var create = await _fixture.HttpClient.PostAsync("/users",
                    new StringContent(reg, Encoding.UTF8, "application/json"));
                create.IsSuccessStatusCode.Should().BeTrue();
            }

            using (var adminUpload = _fixture.CreateAuthenticatedClient(_fixture.AdminToken))
            {
                using var up = await adminUpload.UploadFileAsync($"/resources/{folder}", payload, fileName);
                up.IsSuccessStatusCode.Should().BeTrue();
            }

            async Task<byte[]> DownloadForAsync(string email, string hardware)
            {
                using var api = _fixture.CreateApiClient();
                var token = await api.LoginAsync(email, password);
                api.SetAuthToken(token);
                using var check = await api.PostAsync("/resources/check", new { hardware });
                check.IsSuccessStatusCode.Should().BeTrue();
                using var get = await api.PostAsync($"/resources/get/{folder}",
                    new { password, hardware, fileName });
                get.IsSuccessStatusCode.Should().BeTrue();
                return await get.Content.ReadAsByteArrayAsync();
            }

            // Act
            var bytes1 = await DownloadForAsync(email1, hw1);
            var bytes2 = await DownloadForAsync(email2, hw2);

            // Assert
            bytes1.Should().NotBeEquivalentTo(bytes2);
        }
        finally
        {
            using var clearResponse = await _fixture.HttpClient.PostAsync($"/resources/clear/{folder}",
                new StringContent("", Encoding.UTF8, "application/json"));

            foreach (var email in new[] { email1, email2 })
            {
                using var _ = await _fixture.HttpClient.DeleteAsync($"/users/{Uri.EscapeDataString(email)}");
            }
        }
    }

    [Fact]
    public async Task Disabled_user_cannot_log_in()
    {
        // Arrange
        var email = $"{Guid.NewGuid():N}@sectest.example.com";
        const string password = "TestPwd12345";
        try
        {
            var reg = JsonSerializer.Serialize(new { email, password, role = 10 }, JsonOptions);
            using (var create = await _fixture.HttpClient.PostAsync("/users",
                       new StringContent(reg, Encoding.UTF8, "application/json")))
                create.IsSuccessStatusCode.Should().BeTrue();

            using (var disable = await _fixture.HttpClient.PutAsync(
                       $"/users/{Uri.EscapeDataString(email)}/disable", null))
                disable.IsSuccessStatusCode.Should().BeTrue();

            using var client = _fixture.CreateApiClient();

            // Act
            using var login = await client.PostAsync("/login", new { email, password });

            // Assert
            login.StatusCode.Should().Be(HttpStatusCode.Conflict);
            var err = await login.Content.ReadFromJsonAsync<ErrorResponse>(ResponseJsonOptions);
            err.Should().NotBeNull();
            err!.ErrorCode.Should().Be(38);
        }
        finally
        {
            using var _ = await _fixture.HttpClient.DeleteAsync($"/users/{Uri.EscapeDataString(email)}");
        }
    }

    private sealed class LoginTokenResponse
    {
        public string Token { get; init; } = "";
    }
}