using System.Net;
using System.Net.Http.Json;
using System.Reflection;
using System.Text.Json;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Tiku.Api.Contracts;
using Tiku.Api.Controllers;
using Tiku.Domain.Identity;
using Tiku.Domain.Tenancy;
using Tiku.Infrastructure.Persistence;

namespace Tiku.IntegrationTests.Api;

public sealed class AuthMfaLifecycleTests
{
    [Fact]
    public async Task Enrollment_returns_recovery_codes_once_then_subsequent_login_requires_mfa()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedBackendUserAsync(factory);
        using var client = factory.CreateClient();
        client.DefaultRequestHeaders.Add("x-tenant-code", seed.TenantId.ToString("N"));

        using var login = await PostPasswordLoginAsync(client, seed);
        Assert.Equal("mfa_enrollment_required", login.RootElement.GetProperty("status").GetString());
        var challengeToken = login.RootElement.GetProperty("challengeToken").GetString()!;

        var setupResponse = await client.PostAsJsonAsync(
            "/api/auth/mfa/totp/setup",
            new MfaChallengeDto { ChallengeToken = challengeToken });
        setupResponse.EnsureSuccessStatusCode();
        using var setup = JsonDocument.Parse(await setupResponse.Content.ReadAsStringAsync());
        var sharedKey = setup.RootElement.GetProperty("sharedKey").GetString()!;

        var confirmRequest = new MfaChallengeDto
        {
            ChallengeToken = challengeToken,
            Code = AuthenticationTestClientExtensions.GenerateTotp(sharedKey)
        };
        var confirmResponse = await client.PostAsJsonAsync("/api/auth/mfa/totp/confirm", confirmRequest);
        confirmResponse.EnsureSuccessStatusCode();
        using var confirmation = JsonDocument.Parse(await confirmResponse.Content.ReadAsStringAsync());
        Assert.Equal(
            "authenticated",
            confirmation.RootElement.GetProperty("authentication").GetProperty("status").GetString());
        Assert.Equal(10, confirmation.RootElement.GetProperty("recoveryCodes").GetArrayLength());
        var recoveryCode = confirmation.RootElement.GetProperty("recoveryCodes")[0].GetString()!;

        var replayResponse = await client.PostAsJsonAsync("/api/auth/mfa/totp/confirm", confirmRequest);
        Assert.Equal(HttpStatusCode.Unauthorized, replayResponse.StatusCode);

        using var nextLogin = await PostPasswordLoginAsync(client, seed);
        Assert.Equal("mfa_required", nextLogin.RootElement.GetProperty("status").GetString());
        Assert.False(nextLogin.RootElement.TryGetProperty("recoveryCodes", out _));

        var recoveryResponse = await client.PostAsJsonAsync(
            "/api/auth/mfa/totp/verify",
            new MfaChallengeDto
            {
                ChallengeToken = nextLogin.RootElement.GetProperty("challengeToken").GetString()!,
                Code = recoveryCode
            });
        recoveryResponse.EnsureSuccessStatusCode();

        using var finalLogin = await PostPasswordLoginAsync(client, seed);
        var replayedRecoveryResponse = await client.PostAsJsonAsync(
            "/api/auth/mfa/totp/verify",
            new MfaChallengeDto
            {
                ChallengeToken = finalLogin.RootElement.GetProperty("challengeToken").GetString()!,
                Code = recoveryCode
            });
        Assert.Equal(HttpStatusCode.Unauthorized, replayedRecoveryResponse.StatusCode);

        using var scope = factory.CreateSystemScope("Verify recovery code audit");
        var dbContext = scope.ServiceProvider.GetRequiredService<TikuDbContext>();
        var recoveryAudits = await dbContext.AuditLogs
            .Where(item => item.Action == "auth.mfa.verified")
            .ToArrayAsync();
        var recoveryAudit = Assert.Single(recoveryAudits, item =>
            item.Details.ToString().Contains("recovery_code", StringComparison.Ordinal));
        Assert.Equal(seed.TenantId, recoveryAudit.TenantId);
    }

    [Fact]
    public async Task Forced_password_change_precedes_mfa_enrollment()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedBackendUserAsync(factory, forcePasswordChange: true);
        using var client = factory.CreateClient();
        client.DefaultRequestHeaders.Add("x-tenant-code", seed.TenantId.ToString("N"));

        using var login = await PostPasswordLoginAsync(client, seed);

        Assert.Equal("password_change_required", login.RootElement.GetProperty("status").GetString());
        Assert.False(string.IsNullOrWhiteSpace(login.RootElement.GetProperty("challengeToken").GetString()));
    }

    [Theory]
    [InlineData(nameof(AuthController.LoginWithPassword), "login/password")]
    [InlineData(nameof(AuthController.SendSmsCode), "sms/send")]
    [InlineData(nameof(AuthController.LoginWithSms), "login/sms")]
    [InlineData(nameof(AuthController.LoginWithWechatWeb), "oauth/wechat")]
    [InlineData(nameof(AuthController.LoginWithWechatMiniApp), "oauth/wechat-miniapp")]
    [InlineData(nameof(AuthController.SetupTotp), "mfa/totp/setup")]
    [InlineData(nameof(AuthController.ConfirmTotp), "mfa/totp/confirm")]
    [InlineData(nameof(AuthController.VerifyTotp), "mfa/totp/verify")]
    [InlineData(nameof(AuthController.Refresh), "refresh")]
    [InlineData(nameof(AuthController.Logout), "logout")]
    [InlineData(nameof(AuthController.LogoutAll), "logout-all")]
    public void Authentication_routes_match_the_v2_contract(string actionName, string route)
    {
        var action = typeof(AuthController).GetMethod(actionName, BindingFlags.Public | BindingFlags.Instance);
        var attribute = action?.GetCustomAttribute<HttpPostAttribute>();

        Assert.NotNull(attribute);
        Assert.Equal(route, attribute.Template);
    }

    private static async Task<JsonDocument> PostPasswordLoginAsync(
        HttpClient client,
        (Guid TenantId, string Phone) seed)
    {
        var response = await client.PostAsJsonAsync(
            "/api/auth/login/password",
            new PasswordLoginDto
            {
                Realm = AuthRealm.Tenant,
                TenantCode = seed.TenantId.ToString("N"),
                Identifier = seed.Phone,
                Password = PasswordTestUserExtensions.TestPassword
            });
        response.EnsureSuccessStatusCode();
        return JsonDocument.Parse(await response.Content.ReadAsStringAsync());
    }

    private static async Task<(Guid TenantId, string Phone)> SeedBackendUserAsync(
        ApiTestFactory factory,
        bool forcePasswordChange = false)
    {
        var tenantId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        const string phone = "13800000000";
        await factory.SeedAsync(
            new Tenant
            {
                Id = tenantId,
                Slug = tenantId.ToString("N"),
                Name = "MFA Lifecycle Tenant"
            },
            new User
            {
                Id = userId,
                Phone = phone,
                Name = "MFA Lifecycle User",
                ForcePasswordChange = forcePasswordChange
            }.WithTestPassword(),
            new TenantMembership
            {
                TenantId = tenantId,
                UserId = userId,
                Role = TenantRole.TenantAdmin,
                Status = MembershipStatus.Active
            });
        return (tenantId, phone);
    }
}