using Microsoft.AspNetCore.Components.Authorization;
using ZB.MOM.WW.ScadaBridge.CentralUI.Services;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using NSubstitute;
using ZB.MOM.WW.Auth.Abstractions.Ldap;
using ZB.MOM.WW.Auth.Abstractions.Roles;
using ZB.MOM.WW.ScadaBridge.CentralUI.Auth;
using ZB.MOM.WW.ScadaBridge.Security;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Auth;

public class CircuitRevocationRegressionTests
{
    /// <summary>Verifies that an explicit server auto-login does not remap the synthetic cookie principal.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task ExplicitServerAutoLogin_DoesNotRemapSyntheticCookiePrincipal()
    {
        var initial = SessionClaimBuilder.Build("developer", "Developer", [],
            new RoleMappingResult(Roles.All, [], true), DateTimeOffset.UtcNow);
        var mapper = Substitute.For<IGroupRoleMapper<string>>();
        mapper.MapAsync(Arg.Any<IReadOnlyList<string>>(), Arg.Any<CancellationToken>())
            .Returns(new GroupRoleMapping<string>([], Scope: new RoleMappingResult([], [], false)));
        var services = new ServiceCollection().AddLogging();
        services.AddSingleton(mapper);
        services.AddSingleton<TimeProvider>(TimeProvider.System);
        services.AddSingleton(Options.Create(new SecurityOptions()));
        services.AddSingleton(Options.Create(new ZB.MOM.WW.ScadaBridge.Security.Auth.AuthDisableLoginOptions { DisableLogin = true }));
        services.AddScoped<CookieSessionValidator>();
        services.AddSingleton<IHttpContextAccessor>(new HttpContextAccessor { HttpContext = new DefaultHttpContext { User = initial } });
        services.AddScoped<AuthenticationStateProvider, CookieAuthenticationStateProvider>();
        using var provider = services.BuildServiceProvider();
        using var scope = provider.CreateScope();
        var auth = scope.ServiceProvider.GetRequiredService<AuthenticationStateProvider>();
        var state = await auth.GetAuthoritativeStateAsync();
        Assert.Contains(state.User.Claims, claim => claim.Type == JwtTokenService.RoleClaimType && claim.Value == Roles.Administrator);
        await mapper.DidNotReceive().MapAsync(Arg.Any<IReadOnlyList<string>>(), Arg.Any<CancellationToken>());
    }

    /// <summary>Verifies that the same circuit rechecks role mapping and site scope after a grant is revoked.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task SameCircuit_RechecksMappingAndScope_AfterGrantRevocation()
    {
        var mapping = new RoleMappingResult([Roles.Deployer, Roles.Administrator], ["1"], false);
        var mapper = Substitute.For<IGroupRoleMapper<string>>();
        mapper.MapAsync(Arg.Any<IReadOnlyList<string>>(), Arg.Any<CancellationToken>())
            .Returns(_ => new GroupRoleMapping<string>(mapping.Roles, Scope: mapping));
        var initial = SessionClaimBuilder.Build("alice", "Alice", ["group"], mapping, DateTimeOffset.UtcNow);
        var services = new ServiceCollection().AddLogging();
        services.AddSingleton(mapper);
        var transaction = Substitute.For<IConfigurationCommandTransaction>();
        services.AddSingleton(transaction);
        services.AddScoped<ConfigurationCommandService>();
        services.AddSingleton<TimeProvider>(TimeProvider.System);
        services.AddSingleton(Options.Create(new SecurityOptions()));
        services.AddScoped<CookieSessionValidator>();
        services.AddSingleton<IHttpContextAccessor>(new HttpContextAccessor { HttpContext = new DefaultHttpContext { User = initial } });
        services.AddScoped<AuthenticationStateProvider, CookieAuthenticationStateProvider>();
        using var provider = services.BuildServiceProvider();
        using var scope = provider.CreateScope();
        var auth = scope.ServiceProvider.GetRequiredService<AuthenticationStateProvider>();
        var sites = new SiteScopeService(auth);
        Assert.True(await sites.IsSiteAllowedAsync(1));
        mapping = new RoleMappingResult([Roles.Viewer], ["2"], false);
        // Authoritative read: a non-authoritative read may reuse the circuit's last
        // revalidation for CookieAuthenticationStateProvider.NonAuthoritativeRefreshInterval
        // (review 2026-10-21 07/P-3); every gate below is authoritative.
        var refreshed = await auth.GetAuthoritativeStateAsync();
        Assert.DoesNotContain(Roles.Deployer, refreshed.User.FindAll(JwtTokenService.RoleClaimType).Select(c => c.Value));
        Assert.False(await sites.IsSiteAllowedAsync(1));
        Assert.True(await sites.IsSiteAllowedAsync(2));
        // The already-created circuit facade must deny before starting any save transaction.
        var commands = scope.ServiceProvider.GetRequiredService<ConfigurationCommandService>();
        await Assert.ThrowsAsync<UnauthorizedAccessException>(() => commands.ExecuteAsync(new CreateRoleMappingCommand("blocked", Roles.Viewer)));
        await transaction.DidNotReceive().ExecuteAsync(Arg.Any<Func<IServiceProvider, Task<object?>>>());
    }

    // ---- ScadaBridge#46: directory group re-query reaches a live circuit ----

    private static (AuthenticationStateProvider Auth, ILdapGroupLookup Lookup, ServiceProvider Provider) DirectoryCircuit(
        IReadOnlyList<string> loginGroups, bool disableLogin = false)
    {
        // Session issued 16 minutes ago, so the 15-minute group re-query is due on the first read.
        var issued = DateTimeOffset.UtcNow.AddMinutes(-16);
        var initial = SessionClaimBuilder.Build("alice", "Alice", loginGroups,
            new RoleMappingResult([Roles.Administrator], [], true), issued);
        var mapper = Substitute.For<IGroupRoleMapper<string>>();
        mapper.MapAsync(Arg.Any<IReadOnlyList<string>>(), Arg.Any<CancellationToken>())
            .Returns(call =>
            {
                var groups = call.Arg<IReadOnlyList<string>>();
                var roles = groups.Contains("SCADA-Admins") ? new[] { Roles.Administrator } : new[] { Roles.Viewer };
                return new GroupRoleMapping<string>(roles, Scope: new RoleMappingResult(roles, [], true));
            });
        var lookup = Substitute.For<ILdapGroupLookup>();
        var services = new ServiceCollection().AddLogging();
        services.AddSingleton(mapper);
        services.AddSingleton(lookup);
        services.AddSingleton<TimeProvider>(TimeProvider.System);
        // Cache off, so "no second query" below is proven by the session's advanced anchor, not the cache.
        services.AddSingleton(Options.Create(new SecurityOptions { LdapGroupRefresh = { CacheSeconds = 0 } }));
        services.AddSingleton(Options.Create(new ZB.MOM.WW.ScadaBridge.Security.Auth.AuthDisableLoginOptions { DisableLogin = disableLogin }));
        services.AddSingleton<DirectoryGroupRefresher>();
        services.AddScoped<CookieSessionValidator>();
        services.AddSingleton<IHttpContextAccessor>(new HttpContextAccessor { HttpContext = new DefaultHttpContext { User = initial } });
        services.AddScoped<AuthenticationStateProvider, CookieAuthenticationStateProvider>();
        var provider = services.BuildServiceProvider();
        return (provider.CreateScope().ServiceProvider.GetRequiredService<AuthenticationStateProvider>(), lookup, provider);
    }

    /// <summary>A directory group removal lands in an open circuit without re-login (ScadaBridge#46).</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task SameCircuit_PicksUpDirectoryGroupRemoval_WithoutReLogin()
    {
        var (auth, lookup, provider) = DirectoryCircuit(["SCADA-Admins"]);
        using var _ = provider;
        lookup.GetUserGroupsAsync("alice", Arg.Any<CancellationToken>())
            .Returns(LdapGroupLookupResult.Found("alice", "Alice", ["SCADA-Viewers"]));

        var state = await auth.GetAuthoritativeStateAsync();

        var roles = state.User.FindAll(JwtTokenService.RoleClaimType).Select(c => c.Value).ToList();
        Assert.Equal([Roles.Viewer], roles);
        Assert.True(state.User.Identity!.IsAuthenticated);
        await lookup.Received(1).GetUserGroupsAsync("alice", Arg.Any<CancellationToken>());

        // The circuit's rebuilt principal carries the advanced anchor: the next read does not re-query.
        await auth.GetAuthoritativeStateAsync();
        await lookup.Received(1).GetUserGroupsAsync("alice", Arg.Any<CancellationToken>());
    }

    /// <summary>A user disabled in the directory loses the circuit's authentication; a gate then denies.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task SameCircuit_DirectoryDisabledUser_BecomesAnonymous()
    {
        var (auth, lookup, provider) = DirectoryCircuit(["SCADA-Admins"]);
        using var _ = provider;
        lookup.GetUserGroupsAsync("alice", Arg.Any<CancellationToken>())
            .Returns(LdapGroupLookupResult.Of(LdapGroupLookupStatus.UserDisabled));

        var state = await auth.GetAuthoritativeStateAsync();

        Assert.False(state.User.Identity?.IsAuthenticated ?? false);
        Assert.Empty(state.User.FindAll(JwtTokenService.RoleClaimType));
    }

    /// <summary>An LDAP outage keeps the circuit's roles, even on the fail-closed authoritative path.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task SameCircuit_DirectoryUnavailable_KeepsRoles()
    {
        var (auth, lookup, provider) = DirectoryCircuit(["SCADA-Admins"]);
        using var _ = provider;
        lookup.GetUserGroupsAsync("alice", Arg.Any<CancellationToken>())
            .Returns(LdapGroupLookupResult.Of(LdapGroupLookupStatus.DirectoryUnavailable));

        var state = await auth.GetAuthoritativeStateAsync();

        Assert.Contains(state.User.FindAll(JwtTokenService.RoleClaimType), c => c.Value == Roles.Administrator);
    }

    /// <summary>DisableLogin (auto-login) never queries the directory.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task DisableLogin_NeverQueriesTheDirectory()
    {
        var (auth, lookup, provider) = DirectoryCircuit([], disableLogin: true);
        using var _ = provider;

        await auth.GetAuthoritativeStateAsync();

        await lookup.DidNotReceive().GetUserGroupsAsync(Arg.Any<string>(), Arg.Any<CancellationToken>());
    }
}