using System.Text.Json.Nodes;

namespace MoShiro.Backend.Tests;

/// <summary>真实的后端 + 真实的 Agent + 真实的拨号侧 Agent（都在进程内，回环网络）。</summary>
// 慢的端到端测试（真实时间的阶梯、要等测量块出来）：CI 里单独一批跑（Category=Slow），不拦着出镜像，见 ci/verify-backend.sh
[Trait("Category", "Slow")]
public sealed class DialerEndToEndTests : IClassFixture<BackendFixture>
{
    private readonly BackendFixture _backend;

    public DialerEndToEndTests(BackendFixture backend)
    {
        _backend = backend;
    }

    private async Task<JsonNode> AgentViewAsync(AgentHarness agent) => await _backend.GetJsonAsync(_backend.Admin, "/api/admin/agents/" + agent.Id);

    private async Task<int> ChunkCountAsync(AgentHarness agent, string kind) =>
        (await _backend.GetJsonAsync(_backend.Admin, $"/api/admin/raw/chunks?agent_id={agent.Id}"))["items"]!.AsArray().Count(c => c!["kind"]!.GetValue<string>() == kind);

    [Fact]
    public async Task Dialer_FollowsTheAgentListThePanelKnows_AndSavesItForTheNextStart()
    {
        await using AgentHarness first = await AgentHarness.StartAsync(_backend);
        await using DialerHarness dialer = await DialerHarness.StartAsync(_backend);
        await BackendFixture.EventuallyAsync(() => Task.FromResult(dialer.App.Dialer.IsConnected(first.Id)));

        await using AgentHarness second = await AgentHarness.StartAsync(_backend);
        await BackendFixture.EventuallyAsync(() => Task.FromResult(dialer.App.Dialer.IsConnected(second.Id)), TimeSpan.FromSeconds(30), "a new Agent should arrive through dial_targets state sync: " + string.Join(";", dialer.App.Dialer.Directory.Targets.Select(a => $"{a.NodeId}@{a.Host}:{a.TcpPort}")) + " v" + dialer.App.Dialer.Directory.Version + " want " + second.Id);
        Assert.Contains(dialer.App.Dialer.Directory.Targets, a => a.NodeId == second.Id);
        Assert.True(File.Exists(Path.Combine(dialer.Directory, "dial_targets.json")));

        // 停用一个 Agent：Dialer 断开它
        using HttpResponseMessage disabled = await _backend.Admin.PostAsync($"/api/admin/agents/{second.Id}/disable", BackendFixture.Json(new JsonObject()));
        Assert.True(disabled.IsSuccessStatusCode, await disabled.Content.ReadAsStringAsync());
        await BackendFixture.EventuallyAsync(() => Task.FromResult(!dialer.App.Dialer.IsConnected(second.Id)), TimeSpan.FromSeconds(30));
    }

    [Fact]
    public async Task Hy2Ladder_WithTheRealDialer_Succeeds_AndEveryFragmentIsStored()
    {
        await using AgentHarness agent = await AgentHarness.StartAsync(_backend);
        await agent.OverrideLineTasksAsync();
        await using DialerHarness dialer = await DialerHarness.StartAsync(_backend);
        await BackendFixture.EventuallyAsync(async () => (await AgentViewAsync(agent))["dialer_connected"]!.GetValue<bool>());

        using HttpResponseMessage accepted = await _backend.Admin.PostAsync($"/api/admin/lines/{agent.Id}~{dialer.DialerId}/tests", BackendFixture.Json(new JsonObject { ["plan"] = "hy2_ladder", ["params"] = new JsonObject { ["size"] = 1000, ["duration_s"] = 5 } }));
        Assert.True(accepted.StatusCode == System.Net.HttpStatusCode.Accepted, await accepted.Content.ReadAsStringAsync());
        string testId = JsonNode.Parse(await accepted.Content.ReadAsStringAsync())!["id"]!.GetValue<string>();

        JsonNode test = null!;
        await BackendFixture.EventuallyAsync(
            async () =>
            {
                test = await _backend.GetJsonAsync(_backend.Admin, "/api/public/tests/" + testId);
                return test["status"]!.GetValue<string>() is "succeeded" or "failed" or "aborted";
            },
            TimeSpan.FromSeconds(90));
        Assert.True(test["status"]!.GetValue<string>() == "succeeded", test.ToJsonString());

        await BackendFixture.EventuallyAsync(async () => await ChunkCountAsync(agent, "quic_stream") >= 5, because: "the 100 Mbit/s phase (5 s of 1000 B packets, over 50000 records) is split into two fragments");
        Assert.Equal(0, agent.App.Counters.FragmentsDiscarded);
    }

    [Fact]
    public async Task RealitySession_WithTheRealDialer_RunsTcpBulkAndStoresBytesAndKernelRows()
    {
        await using AgentHarness agent = await AgentHarness.StartAsync(_backend);
        await agent.OverrideLineTasksAsync();
        await using DialerHarness dialer = await DialerHarness.StartAsync(_backend);
        await BackendFixture.EventuallyAsync(async () => (await AgentViewAsync(agent))["dialer_connected"]!.GetValue<bool>());

        using HttpResponseMessage accepted = await _backend.Admin.PostAsync($"/api/admin/lines/{agent.Id}~{dialer.DialerId}/tests", BackendFixture.Json(new JsonObject { ["plan"] = "reality_session" }));
        Assert.True(accepted.StatusCode == System.Net.HttpStatusCode.Accepted, await accepted.Content.ReadAsStringAsync());
        string testId = JsonNode.Parse(await accepted.Content.ReadAsStringAsync())!["id"]!.GetValue<string>();

        JsonNode test = null!;
        await BackendFixture.EventuallyAsync(
            async () =>
            {
                test = await _backend.GetJsonAsync(_backend.Admin, "/api/public/tests/" + testId);
                return test["status"]!.GetValue<string>() is "succeeded" or "failed" or "aborted";
            },
            TimeSpan.FromSeconds(150));
        Assert.True(test["status"]!.GetValue<string>() == "succeeded", test.ToJsonString());
        await BackendFixture.EventuallyAsync(async () => await ChunkCountAsync(agent, "tcp_transfer") >= 1, because: "the bulk phase stores its fragments");
        Assert.Equal(0, agent.App.Counters.FragmentsDiscarded);
    }
}