using System.Net.Http.Json;
using System.Security.Claims;
using ItWorx.KnowledgeHub.Api.Authorization;
using ItWorx.KnowledgeHub.Application.Ingestion;
using ItWorx.KnowledgeHub.Contracts.Admin;
using ItWorx.KnowledgeHub.Contracts.Auth;
using ItWorx.KnowledgeHub.Contracts.Automation;
using ItWorx.KnowledgeHub.Domain.Automation;
using ItWorx.KnowledgeHub.IntegrationTests.Infrastructure;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;

namespace ItWorx.KnowledgeHub.IntegrationTests.Ingestion;

/// <summary>
/// Covers the bounded Task 3 surface without registering proposal routes that Task 4
/// owns. The policy probe invokes the application's registered authorization policies
/// against the same claims emitted by the service-token handler.
/// </summary>
[Collection(PostgresTestGroup.Name)]
public sealed class IngestionProposalAuthorizationTests : OwnerSetupTestBase
{
    private readonly PostgresContainerFixture _postgres;

    public IngestionProposalAuthorizationTests(PostgresContainerFixture postgres) : base(postgres)
    {
        _postgres = postgres;
    }

    [Fact]
    public async Task Ingestion_write_scope_satisfies_submission_but_not_human_review()
    {
        using var scope = Factory.Services.CreateScope();
        var authorization = scope.ServiceProvider.GetRequiredService<IAuthorizationService>();

        var ingestingService = ServicePrincipal(Scopes.IngestionWrite);

        Assert.True((await authorization.AuthorizeAsync(
            ingestingService, resource: null, AuthorizationPolicies.IngestionWrite)).Succeeded);
        Assert.False((await authorization.AuthorizeAsync(
            ingestingService, resource: null, AuthorizationPolicies.IngestionReview)).Succeeded);
    }

    [Fact]
    public async Task Pages_write_scope_cannot_satisfy_ingestion_submission()
    {
        using var scope = Factory.Services.CreateScope();
        var authorization = scope.ServiceProvider.GetRequiredService<IAuthorizationService>();

        var pagesService = ServicePrincipal(Scopes.PagesWrite);

        Assert.False((await authorization.AuthorizeAsync(
            pagesService, resource: null, AuthorizationPolicies.IngestionWrite)).Succeeded);
    }

    [Fact]
    public async Task A_delegated_principal_with_ingestion_write_can_submit_but_cannot_review()
    {
        using var scope = Factory.Services.CreateScope();
        var authorization = scope.ServiceProvider.GetRequiredService<IAuthorizationService>();

        var delegatedIdentity = new ClaimsIdentity(
        [
            new Claim(ClaimTypes.NameIdentifier, Guid.NewGuid().ToString()),
            new Claim(ClaimTypes.Name, "delegated-human")
        ], authenticationType: "delegated-cookie");
        var serviceIdentity = new ClaimsIdentity(
        [
            new Claim(ClaimTypes.NameIdentifier, Guid.NewGuid().ToString()),
            new Claim(ServiceTokenAuthenticationHandler.ServiceAccountClaimType, Guid.NewGuid().ToString()),
            new Claim(ServiceTokenAuthenticationHandler.ScopeClaimType, Scopes.IngestionWrite)
        ], ServiceTokenAuthenticationDefaults.Scheme);

        var delegatedService = new ClaimsPrincipal([delegatedIdentity, serviceIdentity]);

        Assert.True((await authorization.AuthorizeAsync(
            delegatedService, resource: null, AuthorizationPolicies.IngestionWrite)).Succeeded);
        Assert.False((await authorization.AuthorizeAsync(
            delegatedService, resource: null, AuthorizationPolicies.IngestionReview)).Succeeded);
    }

    [Fact]
    public async Task Default_options_disable_ingestion_and_anonymous_session_has_no_features_or_workspace()
    {
        using var scope = Factory.Services.CreateScope();
        var options = scope.ServiceProvider.GetRequiredService<IOptions<IngestionProposalOptions>>().Value;
        Assert.False(options.Enabled);

        using var client = Factory.CreateClient();
        var session = await client.GetFromJsonAsync<SessionResponse>("/api/v1/auth/session");

        Assert.NotNull(session);
        Assert.False(session.Authenticated);
        Assert.Null(session.Features);
        Assert.Null(session.WorkspaceId);
        Assert.Null(session.Role);
    }

    [Fact]
    public async Task Authenticated_default_configuration_session_exposes_disabled_ingestion_feature()
    {
        using var client = Factory.CreateClient();
        var login = await SetupHelper.LoginAsync(client, OwnerEmail, OwnerPassword);
        login.EnsureSuccessStatusCode();
        var session = await login.Content.ReadFromJsonAsync<SessionResponse>();

        Assert.NotNull(session);
        Assert.True(session.Authenticated);
        Assert.NotNull(session.Features);
        Assert.False(session.Features.IngestionProposals);
    }

    [Fact]
    public async Task An_authenticated_human_editor_can_submit_and_review()
    {
        using var administratorClient = Factory.CreateClient();
        var administratorLogin = await SetupHelper.LoginAsync(administratorClient, OwnerEmail, OwnerPassword);
        administratorLogin.EnsureSuccessStatusCode();

        const string editorEmail = "ingestion-editor@itworx.test";
        const string editorPassword = "editor-strong-password";
        var createEditor = await SetupHelper.PostWithCsrfAsync(
            administratorClient,
            "/api/v1/admin/users",
            new CreateUserRequest("Ingestion Editor", editorEmail, editorPassword, "Editor"));
        createEditor.EnsureSuccessStatusCode();

        using var editorClient = Factory.CreateClient();
        var editorLogin = await SetupHelper.LoginAsync(editorClient, editorEmail, editorPassword);
        editorLogin.EnsureSuccessStatusCode();
        var session = await editorLogin.Content.ReadFromJsonAsync<SessionResponse>();
        Assert.NotNull(session?.UserId);
        Assert.Equal("Editor", session.Role);

        using var scope = Factory.Services.CreateScope();
        var accessor = scope.ServiceProvider.GetRequiredService<IHttpContextAccessor>();
        accessor.HttpContext = new DefaultHttpContext { User = HumanPrincipal(session.UserId.Value) };

        try
        {
            var authorization = scope.ServiceProvider.GetRequiredService<IAuthorizationService>();
            var human = HumanPrincipal(session.UserId.Value);

            Assert.True((await authorization.AuthorizeAsync(
                human, resource: null, AuthorizationPolicies.IngestionWrite)).Succeeded);
            Assert.True((await authorization.AuthorizeAsync(
                human, resource: null, AuthorizationPolicies.IngestionReview)).Succeeded);
        }
        finally
        {
            accessor.HttpContext = null;
        }
    }

    [Fact]
    public async Task Authenticated_session_exposes_only_the_server_configured_ingestion_feature()
    {
        var configuredFactory = new KnowledgeHubIntegrationFactory(_postgres,
            new Dictionary<string, string?> { ["IngestionProposal:Enabled"] = "true" });
        await ((IAsyncLifetime)configuredFactory).InitializeAsync();

        try
        {
            using var client = configuredFactory.CreateClient();
            var setup = await SetupHelper.CompleteFirstRunSetupAsync(
                client, "Ingestion test", "Owner", "ingestion-owner@itworx.test", "correct-horse-battery-staple");
            setup.EnsureSuccessStatusCode();

            var login = await SetupHelper.LoginAsync(client, "ingestion-owner@itworx.test", "correct-horse-battery-staple");
            login.EnsureSuccessStatusCode();
            var session = await login.Content.ReadFromJsonAsync<SessionResponse>();

            Assert.NotNull(session);
            Assert.True(session.Authenticated);
            Assert.NotNull(session.Features);
            Assert.True(session.Features.IngestionProposals);
        }
        finally
        {
            await ((IAsyncLifetime)configuredFactory).DisposeAsync();
        }
    }

    [Fact]
    public async Task Ingestion_write_is_an_accepted_service_account_scope()
    {
        using var client = Factory.CreateClient();
        var login = await SetupHelper.LoginAsync(client, OwnerEmail, OwnerPassword);
        login.EnsureSuccessStatusCode();

        var response = await SetupHelper.PostWithCsrfAsync(
            client,
            "/api/v1/service-accounts",
            new CreateServiceAccountRequest("ingestion", "trusted intake", [Scopes.IngestionWrite]));

        response.EnsureSuccessStatusCode();
    }

    private static ClaimsPrincipal ServicePrincipal(string scope)
    {
        var identity = new ClaimsIdentity(
        [
            new Claim(ClaimTypes.NameIdentifier, Guid.NewGuid().ToString()),
            new Claim(ServiceTokenAuthenticationHandler.ServiceAccountClaimType, Guid.NewGuid().ToString()),
            new Claim(ServiceTokenAuthenticationHandler.ScopeClaimType, scope)
        ], ServiceTokenAuthenticationDefaults.Scheme);

        return new ClaimsPrincipal(identity);
    }

    private static ClaimsPrincipal HumanPrincipal(Guid userId) => new(new ClaimsIdentity(
        [
            new Claim(ClaimTypes.NameIdentifier, userId.ToString()),
            new Claim(ClaimTypes.Name, "human-editor")
        ], authenticationType: "cookie"));
}