using System.Net;
using Microsoft.Extensions.DependencyInjection;
using MoShiro.Backend.Application;
using MoShiro.Protocol;
using System.Text.Json.Nodes;
using MoShiro.TestSupport;

namespace MoShiro.Backend.Tests;

/// <summary>public_host 和 ipv6_host 自动识别：Agent 上报公网地址，手填的优先，可以撤销手填。</summary>
[Collection("probe-e2e")]
public sealed class AddressTests
{
    private const string V4 = "8.8.4.4";
    private const string V6 = "2606:4700:4700::1111";
    private readonly BackendFixture _backend;

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

    private async Task<JsonNode> AgentAsync(string id) => await _backend.GetJsonAsync(_backend.Admin, "/api/admin/agents/" + id);

    private async Task<JsonNode> PatchAsync(string id, JsonObject body)
    {
        using HttpResponseMessage response = await _backend.Admin.PatchAsync("/api/admin/agents/" + id, BackendFixture.Json(body));
        string text = await response.Content.ReadAsStringAsync();
        Assert.True(response.IsSuccessStatusCode, text);
        return JsonNode.Parse(text)!;
    }

    [Fact]
    public async Task Hello_FillsPublicHostAndIpv6Host_PrivateAndTemporaryAddressesAreIgnored()
    {
        await using AgentSimulator agent = await _backend.ConnectAgentAsync(hello: false);
        agent.Addresses = ["10.0.0.5", "192.168.1.9", "fd00::1", "fe80::1", V6, V4];
        await agent.HelloAsync();

        JsonNode view = null!;
        await BackendFixture.EventuallyAsync(async () => (view = await AgentAsync(agent.NodeId.Value))["ipv6_host"]!.GetValue<string>() == V6);
        Assert.Equal(V4, view["public_host"]!.GetValue<string>());
        Assert.True(view["public_host_auto"]!.GetValue<bool>());
        Assert.True(view["ipv6_host_auto"]!.GetValue<bool>());
    }

    [Fact]
    public async Task ManualValues_WinOverAutoDetection_AndCanBeRevokedBackToAuto()
    {
        await using AgentSimulator agent = await _backend.ConnectAgentAsync(hello: false);
        string id = agent.NodeId.Value;
        agent.Addresses = [V4, V6];
        await agent.HelloAsync();
        await BackendFixture.EventuallyAsync(async () => (await AgentAsync(id))["ipv6_host"]!.GetValue<string>() == V6);

        // 手填：标记为手动，之后 Agent 再上报别的地址也不覆盖
        JsonNode manual = await PatchAsync(id, new JsonObject { ["public_host"] = "agent.example.net", ["ipv6_host"] = "" });
        Assert.False(manual["public_host_auto"]!.GetValue<bool>());
        Assert.False(manual["ipv6_host_auto"]!.GetValue<bool>());
        agent.Addresses = ["1.1.1.1", "2606:4700:4700::1001"];
        await agent.HelloAsync();
        await Task.Delay(300);
        JsonNode kept = await AgentAsync(id);
        Assert.Equal("agent.example.net", kept["public_host"]!.GetValue<string>());
        Assert.Equal("", kept["ipv6_host"]!.GetValue<string>()); // 空 = 手动关闭 IPv6

        // 撤销手填：马上按最近一次上报的地址重新识别
        JsonNode auto = await PatchAsync(id, new JsonObject { ["public_host_auto"] = true, ["ipv6_host_auto"] = true });
        Assert.Equal("1.1.1.1", auto["public_host"]!.GetValue<string>());
        Assert.Equal("2606:4700:4700::1001", auto["ipv6_host"]!.GetValue<string>());
        Assert.True(auto["public_host_auto"]!.GetValue<bool>());
    }

    [Fact]
    public async Task AutoDetectedAddress_StaysWhileItIsStillReported_SoReorderingDoesNotFlap()
    {
        await using AgentSimulator agent = await _backend.ConnectAgentAsync(hello: false);
        string id = agent.NodeId.Value;
        agent.Addresses = [V4, "9.9.9.9"];
        await agent.HelloAsync();
        await BackendFixture.EventuallyAsync(async () => (await AgentAsync(id))["public_host"]!.GetValue<string>() == V4);

        agent.Addresses = ["1.0.0.1", V4];
        await agent.HelloAsync();
        await Task.Delay(300);
        Assert.Equal(V4, (await AgentAsync(id))["public_host"]!.GetValue<string>());

        // 原来的地址不见了才换
        agent.Addresses = ["1.0.0.1"];
        await agent.HelloAsync();
        await BackendFixture.EventuallyAsync(async () => (await AgentAsync(id))["public_host"]!.GetValue<string>() == "1.0.0.1");
    }

    [Fact]
    public async Task ProbeAgentList_CarriesTheCertificatePublicKeyTheAgentReported_ForPinningAndKnocking()
    {
        await using AgentSimulator agent = await _backend.ConnectAgentAsync();
        AgentService service = _backend.Services.GetRequiredService<AgentService>();
        ProbeAgentList list = await service.ProbeAgentsAsync(_backend.DefaultProbeId, default);
        AgentEndpoint endpoint = Assert.Single(list.Agents, a => a.AgentId == agent.NodeId);
        Assert.Equal(Convert.ToBase64String(agent.TlsPublicKey), endpoint.PublicKey);
    }
}