using System.Net;
using System.Text.Json.Nodes;
using Monitor.Protocol;
using Monitor.TestSupport;

namespace Monitor.Backend.Tests;

[Collection("probe-e2e")]
public sealed class UpdateTests
{
    private const string Digest = "sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef";

    private readonly BackendFixture _backend;

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

    // 面板不验签（节点宿主机上的更新器验），所以测试里签名随便写一个格式对的
    private static string Manifest(string component, long seq, string digest = Digest) =>
        $$"""{"schema":1,"component":"{{component}}","channel":"dev","image":"registry.example/monitor-dev/monitor-{{component}}","digest":"{{digest}}","tag":"dev-{{seq}}","version":"0.1.1","commit":"abc","built_at":"2026-10-06T00:00:00Z","seq":{{seq}}}""";

    private async Task<HttpResponseMessage> PublishAsync(string manifest, string signature = "MEUCIQDc") =>
        await _backend.Admin.PostAsync("/api/admin/releases", BackendFixture.Json(new JsonObject { ["manifest"] = manifest, ["signature"] = signature }));

    [Fact]
    public async Task Release_IsForwardedByteForByte_ToOnlineNodesOfThatComponent_AndToNodesThatConnectLater()
    {
        long seq = TimeProvider.System.GetUtcNow().ToUnixTimeSeconds() * 1000;
        await using AgentSimulator online = await _backend.ConnectAgentAsync();
        string manifest = Manifest("agent", seq);

        using HttpResponseMessage published = await PublishAsync(manifest);
        Assert.Equal(HttpStatusCode.Created, published.StatusCode);
        JsonNode release = JsonNode.Parse(await published.Content.ReadAsStringAsync())!;
        Assert.Equal("agent", release["component"]!.GetValue<string>());
        Assert.Equal(Digest, release["digest"]!.GetValue<string>());

        await BackendFixture.EventuallyAsync(() => Task.FromResult(online.UpdateOffers.ToArray().Any(o => o.Manifest == manifest && o.Signature == "MEUCIQDc")), because: "the offer reaches online agents unchanged");

        // 之后才连上的节点，hello 之后补发
        await using AgentSimulator late = await _backend.ConnectAgentAsync();
        await BackendFixture.EventuallyAsync(() => Task.FromResult(late.UpdateOffers.ToArray().Any(o => o.Manifest == manifest)), because: "a node that connects later still gets the latest offer");

        // 另一个组件（probe）的清单不会发给 Agent
        using HttpResponseMessage probeRelease = await PublishAsync(Manifest("probe", seq));
        Assert.Equal(HttpStatusCode.Created, probeRelease.StatusCode);
        await Task.Delay(300);
        Assert.DoesNotContain(online.UpdateOffers.ToArray(), o => o.Manifest.Contains("\"component\":\"probe\"", StringComparison.Ordinal));
    }

    [Fact]
    public async Task Release_Registration_RefusesBadManifests_StaleSeq_AndNeedsAnAdmin()
    {
        long seq = TimeProvider.System.GetUtcNow().ToUnixTimeSeconds() * 1000 + 5;
        Assert.Equal(HttpStatusCode.BadRequest, (await PublishAsync("{not json")).StatusCode);
        Assert.Equal(HttpStatusCode.BadRequest, (await PublishAsync(Manifest("agent", seq, digest: "sha256:short"))).StatusCode);
        Assert.Equal(HttpStatusCode.BadRequest, (await PublishAsync(Manifest("backend", seq))).StatusCode);
        Assert.Equal(HttpStatusCode.BadRequest, (await PublishAsync(Manifest("agent", seq), signature: "not base64!")).StatusCode);

        Assert.Equal(HttpStatusCode.Created, (await PublishAsync(Manifest("agent", seq))).StatusCode);
        Assert.Equal(HttpStatusCode.Conflict, (await PublishAsync(Manifest("agent", seq))).StatusCode); // 同一个 seq：重放
        Assert.Equal(HttpStatusCode.Conflict, (await PublishAsync(Manifest("agent", seq - 1))).StatusCode); // 更旧的 seq

        using HttpResponseMessage anonymous = await _backend.Anonymous.PostAsync("/api/admin/releases", BackendFixture.Json(new JsonObject { ["manifest"] = Manifest("agent", seq + 1), ["signature"] = "MEUC" }));
        Assert.Contains(anonymous.StatusCode, new[] { HttpStatusCode.Unauthorized, HttpStatusCode.Forbidden });
    }

    [Fact]
    public async Task UpdateRequest_ReachesTheNode_AndItsReportedStatusShowsInBuildInfo()
    {
        await using AgentSimulator agent = await _backend.ConnectAgentAsync();
        using HttpResponseMessage request = await _backend.Admin.PostAsync($"/api/admin/nodes/{agent.NodeId.Value}/update", null);
        Assert.Equal(HttpStatusCode.NoContent, request.StatusCode);
        await BackendFixture.EventuallyAsync(() => Task.FromResult(agent.UpdateApplies == 1));

        // 节点（宿主机更新器）报告状态：面板在构建信息里显示
        await agent.SendUpdateStatusAsync(new UpdateStatus { State = "available", Available = new UpdateAvailable { Tag = "dev-9", Version = "0.1.1", Digest = Digest, Seq = 9 }, At = TimeProvider.System.GetUtcNow().ToUnixTimeSeconds() });
        await BackendFixture.EventuallyAsync(async () =>
        {
            JsonNode info = await _backend.GetJsonAsync(_backend.Admin, "/api/admin/build-info");
            JsonNode? node = info["nodes"]!.AsArray().FirstOrDefault(n => n!["id"]!.GetValue<string>() == agent.NodeId.Value);
            return node?["update"]?["state"]?.GetValue<string>() == "available" && node["update"]!["available_tag"]!.GetValue<string>() == "dev-9";
        }, because: "the update state comes from the node's heartbeat");

        // 节点离线之后不能请求更新
        string id = agent.NodeId.Value;
        await agent.DisposeAsync();
        await BackendFixture.EventuallyAsync(async () =>
        {
            using HttpResponseMessage offline = await _backend.Admin.PostAsync($"/api/admin/nodes/{id}/update", null);
            return offline.StatusCode == HttpStatusCode.Conflict || offline.StatusCode == HttpStatusCode.NotFound;
        });
    }
}