using System.Net;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
using WxAgent.Core;
using Xunit;

namespace WxAgent.Core.Tests;

public sealed class RemoteReportingTests
{
    [Fact]
    public void WhitelistUsesVerifiedScopedIdentityAndDefaultsToDeny()
    {
        var config = new ReportingConfig
        {
            Enabled = true,
            ConfigVersion = 7,
            Accounts =
            [
                new AccountReportingConfig
                {
                    AccountId = "account-a",
                    Enabled = true,
                    AllowedChats =
                    [
                        new AllowedChat { Type = ReportingChatType.Group, ChatId = "stable-group", Enabled = true, IdentityVerified = true },
                        new AllowedChat { Type = ReportingChatType.Private, ChatId = "unverified", Enabled = true, IdentityVerified = false }
                    ]
                }
            ]
        };

        Assert.True(ReportingAuthorization.IsAllowed(config, "account-a", "stable-group", ReportingChatType.Group, ReportingDataType.Message));
        Assert.False(ReportingAuthorization.IsAllowed(config, "account-a", "same-display-name", ReportingChatType.Group, ReportingDataType.Message));
        Assert.False(ReportingAuthorization.IsAllowed(config, "account-a", "unverified", ReportingChatType.Private, ReportingDataType.Message));
        Assert.False(ReportingAuthorization.IsAllowed(config with { Accounts = [config.Accounts[0] with { AllowedChats = [new AllowedChat { Type = ReportingChatType.Group, ChatId = "stable-group", Enabled = false, IdentityVerified = true }] }] }, "account-a", "stable-group", ReportingChatType.Group, ReportingDataType.Message));
        Assert.False(ReportingAuthorization.IsAllowed(config, "account-b", "stable-group", ReportingChatType.Group, ReportingDataType.Message));
        Assert.True(ReportingAuthorization.IsAllowed(config, "account-a", "stable-group", ReportingChatType.Group, ReportingDataType.TaskResult));
    }

    [Fact]
    public void ReadTaskResultsRequireEveryWhitelistedScope()
    {
        using var document = JsonDocument.Parse("{\"items\":[{\"id\":\"chat-a\"}]}");
        var result = new RemoteTaskResult("task-1", "account-a", 1, RemoteTaskStatus.Succeeded,
            null, null, false, document.RootElement.Clone(), "result-1");
        var config = new ReportingConfig
        {
            Enabled = true,
            ConfigVersion = 2,
            Accounts = [new AccountReportingConfig
            {
                AccountId = "account-a", Enabled = true,
                AllowedChats =
                [
                    new AllowedChat { Type = ReportingChatType.Private, ChatId = "chat-a", Enabled = true, IdentityVerified = true },
                    new AllowedChat { Type = ReportingChatType.Private, ChatId = "chat-b", Enabled = false, IdentityVerified = true }
                ]
            }]
        };

        var allowed = ReportingAuthorization.FilterTaskResultForChats(config, result,
            [new RemoteReportingScope("chat-a", ReportingChatType.Private)], out var allowedDecision);
        Assert.NotNull(allowed.Content);
        Assert.True(allowedDecision.Allowed);

        var denied = ReportingAuthorization.FilterTaskResultForChats(config, result,
            [new RemoteReportingScope("chat-a", ReportingChatType.Private), new RemoteReportingScope("chat-b", ReportingChatType.Private)], out var deniedDecision);
        Assert.Null(denied.Content);
        Assert.False(deniedDecision.Allowed);
    }

    [Fact]
    public async Task ConfigStoreLoadsInvalidConfigAsDenyAndUpdatesOneGlobalVersion()
    {
        var path = Path.Combine(Path.GetTempPath(), "wxagent-reporting-" + Guid.NewGuid().ToString("N") + ".json");
        try
        {
            await File.WriteAllTextAsync(path, "{\"enabled\":true,\"configVersion\":-1}");
            var invalid = await ReportingConfigStore.LoadAsync(path);
            Assert.False(invalid.Enabled);

            var current = new ReportingConfig { ConfigVersion = 3 };
            var updated = ReportingConfigStore.Update(current, value => value with { Enabled = true });
            Assert.Equal(4, updated.ConfigVersion);
            await ReportingConfigStore.SaveAsync(path, updated);
            var loaded = await ReportingConfigStore.LoadAsync(path);
            Assert.True(loaded.Enabled);
            Assert.Equal(4, loaded.ConfigVersion);

            var nodePath = Path.Combine(Path.GetDirectoryName(path)!, "remote-node.json");
            var nodeConfig = (new RemoteNodeConfiguration { Reporting = loaded }).WithAudit("reporting.enable");
            await RemoteNodeConfigurationStore.SaveAsync(nodePath, nodeConfig);
            var nodeLoaded = await RemoteNodeConfigurationStore.LoadAsync(nodePath);
            Assert.Equal("reporting.enable", Assert.Single(nodeLoaded.Audit).Action);
        }
        finally
        {
            if (File.Exists(path)) File.Delete(path);
        }
    }
}

public sealed class RemoteAgentOptionsTests
{
    [Fact]
    public void NonLoopbackHttpRequiresExplicitPrivateNetworkOptIn()
    {
        var options = new RemoteAgentOptions
        {
            AuthAddress = "http://10.1.1.104:18090",
            Token = "node-token",
            NodeId = "node-1"
        };

        Assert.Throws<WxAgentException>(() => options.Validate());
    }

    [Fact]
    public void PrivateNetworkHttpIsAcceptedWithExplicitOptIn()
    {
        var options = new RemoteAgentOptions
        {
            AuthAddress = "http://10.1.1.104:18090",
            Token = "node-token",
            NodeId = "node-1",
            AllowInsecureHttp = true
        };

        options.Validate();
    }

    [Fact]
    public void PublicHttpRemainsRejectedWithOptIn()
    {
        var options = new RemoteAgentOptions
        {
            AuthAddress = "http://8.8.8.8:18090",
            Token = "node-token",
            NodeId = "node-1",
            AllowInsecureHttp = true
        };

        Assert.Throws<WxAgentException>(() => options.Validate());
    }

    [Fact]
    public void TokenFileIsAcceptedWithoutPuttingTheTokenInConfiguration()
    {
        var path = Path.Combine(Path.GetTempPath(), "wxagent-token-" + Guid.NewGuid().ToString("N"));
        try
        {
            File.WriteAllText(path, "file-token\n");
            var options = new RemoteAgentOptions
            {
                AuthAddress = "https://control.example",
                TokenFile = path,
                NodeId = "node-1"
            };

            options.Validate();
            Assert.Equal("file-token", options.GetToken());
            Assert.Null(options.Redacted().Token);
            Assert.Equal("file-configured", options.TokenState);
        }
        finally
        {
            if (File.Exists(path)) File.Delete(path);
        }
    }

    [Fact]
    public void ClientCertificateConfigurationRequiresBothPemFiles()
    {
        var cert = Path.GetTempFileName();
        try
        {
            var options = new RemoteAgentOptions
            {
                AuthAddress = "https://control.example",
                Token = "node-token",
                NodeId = "node-1",
                ClientCertificateFile = cert
            };
            Assert.Throws<WxAgentException>(() => options.Validate());
        }
        finally
        {
            File.Delete(cert);
        }
    }
}

public sealed class RemoteAccountContextTests
{
    [Fact]
    public void SwitchingRequiresOneVerifiedIdentityAndBlocksInFlightWrites()
    {
        var context = new RemoteAccountContext();
        var identities = new[] { new RemoteAccountIdentity("account-a", true), new RemoteAccountIdentity("account-b", false) };
        var first = context.SwitchTo("account-a", identities);
        Assert.True(first.Confirmed);
        Assert.True(context.IsConfirmedFor("account-a"));
        Assert.Throws<WxAgentException>(() => context.SwitchTo("account-b", identities));
        Assert.False(context.Snapshot.Confirmed);
        Assert.Throws<WxAgentException>(() => context.SwitchTo("account-a", identities, hasInFlightWrites: true));
    }
}

public sealed class RemoteQueueAndLedgerTests
{
    [Fact]
    public void RevokedQueuedEventIsDroppedAndSequenceIsNeverReused()
    {
        var directory = Directory.CreateTempSubdirectory("wxagent-remote-");
        try
        {
            var config = new ReportingConfig
            {
                Enabled = true,
                ConfigVersion = 1,
                Accounts = [new AccountReportingConfig
                {
                    AccountId = "account-a", Enabled = true,
                    AllowedChats = [new AllowedChat { Type = ReportingChatType.Group, ChatId = "group-a", Enabled = true, IdentityVerified = true }]
                }]
            };
            var queue = new RemoteEventQueue(Path.Combine(directory.FullName, "events.json"));
            var first = queue.Enqueue(config, "node-1", "account-a", "group-a", ReportingChatType.Group, "message", DateTimeOffset.UtcNow, "one");
            Assert.True(first.Accepted);
            Assert.Equal(1, first.Event!.EventSeq);
            var revoked = config with { Enabled = false, ConfigVersion = 2 };
            Assert.Empty(queue.PrepareForSend(revoked));
            Assert.Equal(0, queue.PendingCount);
            var restored = config with { ConfigVersion = 3 };
            var second = queue.Enqueue(restored, "node-1", "account-a", "group-a", ReportingChatType.Group, "message", DateTimeOffset.UtcNow, "two");
            Assert.True(second.Accepted);
            Assert.Equal(2, second.Event!.EventSeq);
        }
        finally { directory.Delete(true); }
    }

    [Fact]
    public void TaskLedgerRecoversAcceptedWorkAsUnconfirmedAndKeepsTerminalResultForRetry()
    {
        var directory = Directory.CreateTempSubdirectory("wxagent-remote-");
        try
        {
            var path = Path.Combine(directory.FullName, "tasks.json");
            using var document = JsonDocument.Parse("{\"target_id\":\"target\",\"text\":\"hello\",\"confirmed\":true}");
            var task = new RemoteTaskEnvelope("task-1", "node-1", "account-a", "send-text", "idempotency",
                document.RootElement.Clone(), 1, DateTimeOffset.UtcNow.AddMinutes(1), null, RemoteTaskStatus.Pending, 1);
            var ledger = new RemoteTaskLedger(path);
            Assert.True(ledger.Accept(task));
            var reloaded = new RemoteTaskLedger(path);
            var recovered = Assert.Single(reloaded.UnreportedResults());
            Assert.Equal(RemoteTaskStatus.ResultUnconfirmed, recovered.Status);
            reloaded.MarkReported(recovered.TaskId);
            Assert.Empty(reloaded.UnreportedResults());
        }
        finally { directory.Delete(true); }
    }

    [Fact]
    public void TaskLedgerPersistsReadResultScopesForRetry()
    {
        var directory = Directory.CreateTempSubdirectory("wxagent-remote-");
        try
        {
            var path = Path.Combine(directory.FullName, "tasks.json");
            using var document = JsonDocument.Parse("{\"limit\":20,\"offset\":0}");
            using var resultDocument = JsonDocument.Parse("{\"items\":[{\"id\":\"chat-a\"}]}");
            var task = new RemoteTaskEnvelope("task-read", "node-1", "account-a", "read-sessions", "idempotency",
                document.RootElement.Clone(), 1, DateTimeOffset.UtcNow.AddMinutes(1), null, RemoteTaskStatus.Pending, 1);
            var ledger = new RemoteTaskLedger(path);
            Assert.True(ledger.Accept(task));
            ledger.Complete(new RemoteTaskResult("task-read", "account-a", 1, RemoteTaskStatus.Succeeded,
                null, null, false, resultDocument.RootElement.Clone(), "result-1"),
                [new RemoteReportingScope("chat-a", ReportingChatType.Private)]);

            var reloaded = new RemoteTaskLedger(path);
            var pending = Assert.Single(reloaded.UnreportedResultsWithScopes());
            Assert.NotNull(pending.Result.Content);
            var scope = Assert.Single(pending.ReportingScopes);
            Assert.Equal("chat-a", scope.ChatId);
            Assert.Equal(ReportingChatType.Private, scope.ChatType);
        }
        finally { directory.Delete(true); }
    }
}

public sealed class RemoteControlClientTests
{
    [Fact]
    public async Task AuthenticatesBeforeHeartbeatAndDoesNotSendDeniedEvents()
    {
        var handler = new RecordingHandler();
        using var http = new HttpClient(handler);
        using var client = new RemoteControlClient(new RemoteAgentOptions
        {
            AuthAddress = "http://127.0.0.1:8090",
            Token = "node-token",
            NodeId = "node-1",
            ActiveAccountId = "account-a"
        }, http);
        var registration = new RemoteNodeRegistration("node-1", "test", RemoteProtocol.Version, ["heartbeat"], 1,
            [new RemoteAccountSummary("account-a", true, true, 1, 0)]);
        var registered = await client.RegisterAsync(registration);
        Assert.Equal(RemoteAuthState.Authenticated, client.AuthState);
        Assert.True(registered.Authenticated);
        await client.HeartbeatAsync(new RemoteHeartbeat("node-1", "test", RemoteProtocol.Version, RemoteNodeStatus.Online,
            true, true, false, "account-a", 0, 1, "hb-1"));

        var config = new ReportingConfig
        {
            Enabled = true,
            ConfigVersion = 1,
            Accounts = [new AccountReportingConfig
            {
                AccountId = "account-a", Enabled = true,
                AllowedChats = [new AllowedChat { Type = ReportingChatType.Group, ChatId = "allowed", Enabled = true, IdentityVerified = true }]
            }]
        };
        var denied = await client.SubmitEventAsync(config, new RemoteMessageEvent("node-1", "account-a", "blocked",
            ReportingChatType.Private, 1, "message", DateTimeOffset.UtcNow, "private-content", 1, 1, "event-denied"));
        Assert.False(denied.Accepted);
        Assert.Equal("ChatNotAuthorized", denied.Reason);
        Assert.Equal(2, handler.Requests.Count);

        var accepted = await client.SubmitEventAsync(config, new RemoteMessageEvent("node-1", "account-a", "allowed",
            ReportingChatType.Group, 1, "message", DateTimeOffset.UtcNow, "allowed-content", 1, 1, "event-allowed"));
        Assert.True(accepted.Accepted);
        Assert.Equal(3, handler.Requests.Count);
        Assert.All(handler.Requests, request => Assert.Equal("Bearer node-token", request.Authorization));
    }

    [Fact]
    public async Task MissingRemoteCredentialsAreRejectedWithoutNetworkAccess()
    {
        var handler = new RecordingHandler();
        using var client = new RemoteControlClient(new RemoteAgentOptions { AuthAddress = "http://127.0.0.1:8090", NodeId = "node-1" }, new HttpClient(handler));
        await Assert.ThrowsAsync<WxAgentException>(() => client.RegisterAsync(
            new RemoteNodeRegistration("node-1", "test", RemoteProtocol.Version, [], 0, [])));
        Assert.Empty(handler.Requests);
    }

    private sealed class RecordingHandler : HttpMessageHandler
    {
        public List<RecordedRequest> Requests { get; } = [];

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            Requests.Add(new RecordedRequest(request.RequestUri!.AbsolutePath, request.Headers.Authorization?.ToString() ?? ""));
            var body = request.RequestUri.AbsolutePath switch
            {
                "/v1/nodes/register" => JsonSerializer.Serialize(new RemoteNodeRegistrationResponse("node-1", RemoteNodeStatus.Online, true, "register"), RemoteJson.Options),
                "/v1/nodes/node-1/heartbeat" => JsonSerializer.Serialize(new RemoteHeartbeatResponse("node-1", RemoteNodeStatus.Online, DateTimeOffset.UtcNow, "heartbeat"), RemoteJson.Options),
                "/v1/nodes/node-1/events" => JsonSerializer.Serialize(new RemoteEventReceipt(true, false, "event-1", null), RemoteJson.Options),
                _ => throw new InvalidOperationException("Unexpected request " + request.RequestUri.AbsolutePath)
            };
            return Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent(body, Encoding.UTF8, "application/json")
            });
        }
    }

    private sealed record RecordedRequest(string Path, string Authorization);
}