using System.Net;
using System.Text;
using System.Text.Json.Nodes;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting.Server;
using Microsoft.AspNetCore.Hosting.Server.Features;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using MoShiro.Backend.Application;

namespace MoShiro.Backend.Tests;

/// <summary>
/// 面板没有登记过清单时（清过库、CI 登记那一步网络失败），直接从镜像仓库里匿名读取签名清单；取回来的要用 CI 的发布公钥验过才采用，
/// 所以仓库（或者路上的人）给一份伪造的，面板拒绝，安装脚本也就得不到它。
/// </summary>
public sealed class ReleaseFeedTests : IAsyncLifetime
{
    private WebApplication _registry = null!;
    private string _registryUrl = "";
    private string _label = "";

    public async ValueTask InitializeAsync()
    {
        WebApplicationBuilder builder = WebApplication.CreateSlimBuilder(["--urls", "http://127.0.0.1:0"]);
        _registry = builder.Build();
        const string ConfigDigest = "sha256:0000000000000000000000000000000000000000000000000000000000000001";
        _registry.MapGet("/v2/moshiro-dev/moshiro-agent-manifest/manifests/dev", () => Results.Text(new JsonObject { ["schemaVersion"] = 2, ["config"] = new JsonObject { ["digest"] = ConfigDigest } }.ToJsonString(), "application/vnd.oci.image.manifest.v1+json"));
        _registry.MapGet("/v2/moshiro-dev/moshiro-agent-manifest/blobs/" + ConfigDigest, () => Results.Text(
            new JsonObject { ["config"] = new JsonObject { ["Labels"] = new JsonObject { ["org.moshiro.manifest"] = _label, ["org.moshiro.signature"] = "c2ln" } } }.ToJsonString(), "application/json"));
        await _registry.StartAsync();
        _registryUrl = _registry.Services.GetRequiredService<IServer>().Features.Get<IServerAddressesFeature>()!.Addresses.First();
    }

    public async ValueTask DisposeAsync()
    {
        await _registry.StopAsync();
        await _registry.DisposeAsync();
    }

    [Fact]
    public async Task TheManifestAndSignature_AreReadFromTheLabelsOfTheSmallImage()
    {
        string manifest = "{\"schema\":1,\"component\":\"agent\",\"seq\":7}";
        _label = Convert.ToBase64String(Encoding.UTF8.GetBytes(manifest));
        using var feed = new ReleaseFeed(new BackendOptions { NodeImageRegistry = _registryUrl });

        (string Manifest, string Signature)? fetched = await feed.FetchAsync("agent", "dev", default);

        Assert.Equal(manifest, fetched!.Value.Manifest);
        Assert.Equal("c2ln", fetched.Value.Signature);
    }

    [Theory]
    [InlineData("probe", "dev")] // 仓库里没有这个组件的清单
    [InlineData("agent", "release")] // 没有这个通道
    public async Task NothingThere_MeansNull_NotAnException(string component, string channel)
    {
        using var feed = new ReleaseFeed(new BackendOptions { NodeImageRegistry = _registryUrl });

        Assert.Null(await feed.FetchAsync(component, channel, default));
    }

    [Fact]
    public async Task AnUnreachableOrEmptyRegistry_MeansNull()
    {
        using var unreachable = new ReleaseFeed(new BackendOptions { NodeImageRegistry = "http://127.0.0.1:1" });
        using var empty = new ReleaseFeed(new BackendOptions { NodeImageRegistry = "" });

        Assert.Null(await unreachable.FetchAsync("agent", "dev", default));
        Assert.Null(await empty.FetchAsync("agent", "dev", default));
    }

    [Fact]
    public async Task AForgedManifestInTheRegistry_IsNeverServedToTheInstaller()
    {
        // 起一个指向这个假仓库的后端：仓库里是一份没有 CI 签名的清单，安装脚本向面板要清单时必须拿不到
        string directory = Path.Combine(Path.GetTempPath(), "moshiro-feed-" + Guid.NewGuid().ToString("N"));
        _label = Convert.ToBase64String(Encoding.UTF8.GetBytes("{\"schema\":1,\"component\":\"agent\",\"channel\":\"dev\",\"image\":\"evil/agent\",\"digest\":\"sha256:" + new string('a', 64) + "\",\"tag\":\"x\",\"version\":\"9\",\"seq\":999999999999}"));
        await using WebApplication panel = BackendHost.Build(
            ["--urls", "http://127.0.0.1:0", "--Logging:LogLevel:Default=Warning"],
            options =>
            {
                options.DataDirectory = directory;
                options.Pbkdf2Iterations = 1000;
                options.SecureCookies = false;
                options.ClaimCode = "FEED-TEST-CODE";
                options.NodeImageRegistry = _registryUrl;
                options.UpdateChannel = "dev";
                options.GeoLookupUrl = string.Empty;
                options.RequireOwner = false;
            });
        await panel.StartAsync();
        try
        {
            using var http = new HttpClient { BaseAddress = new Uri(panel.Services.GetRequiredService<IServer>().Features.Get<IServerAddressesFeature>()!.Addresses.First()) };
            using HttpResponseMessage setup = await http.PostAsync("/api/admin/auth/setup", BackendFixture.Json(new JsonObject { ["claim_code"] = "FEED-TEST-CODE", ["username"] = "owner", ["password"] = "correct horse battery", ["return_session"] = true }));
            Assert.Equal(HttpStatusCode.Created, setup.StatusCode);
            http.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", JsonNode.Parse(await setup.Content.ReadAsStringAsync())!["session_token"]!.GetValue<string>());
            using HttpResponseMessage created = await http.PostAsync("/api/admin/join-tokens", BackendFixture.Json(new JsonObject { ["role"] = "agent" }));
            Assert.Equal(HttpStatusCode.Created, created.StatusCode);
            string code = JsonNode.Parse(await created.Content.ReadAsStringAsync())!["plaintext"]!.GetValue<string>();

            using HttpResponseMessage manifest = await http.GetAsync("/install/manifest?code=" + Uri.EscapeDataString(code));

            Assert.Equal(HttpStatusCode.NotFound, manifest.StatusCode); // 没有有效的 CI 签名，面板不采用
        }
        finally
        {
            await panel.StopAsync();
            await panel.DisposeAsync();
            Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
            try
            {
                Directory.Delete(directory, recursive: true);
            }
            catch (IOException)
            {
                // 系统临时目录里的残留
            }
        }
    }
}