using System.Net;
using System.Net.Http.Headers;
using System.Text.Json.Nodes;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
using MoShiro.Backend.Api;
using MoShiro.Backend.Application;

namespace MoShiro.Backend.Tests;

/// <summary>能力模型（docs/access.md 第 2 节）：每个管理端点声明能力；密钥只能拿到自己拥有能力的子集；写蕴含读。</summary>
[Collection("probe-e2e")]
public sealed class CapabilityTests
{
    private readonly BackendFixture _backend;

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

    [Fact]
    public void EveryAdminEndpoint_DeclaresACapabilityThatIsInTheCatalog()
    {
        RouteEndpoint[] endpoints = [.. _backend.Services.GetServices<EndpointDataSource>().SelectMany(s => s.Endpoints).OfType<RouteEndpoint>()
            .Where(e => e.RoutePattern.RawText?.StartsWith("/api/admin", StringComparison.Ordinal) == true)];
        Assert.NotEmpty(endpoints);
        foreach (RouteEndpoint endpoint in endpoints)
        {
            CapabilityRequirement? requirement = endpoint.Metadata.GetMetadata<CapabilityRequirement>();
            Assert.True(requirement is not null, $"{endpoint.RoutePattern.RawText} does not declare a capability");
            if (requirement.Capability is { } capability)
            {
                Assert.True(capability == Capability.Authenticated || CapabilityCatalog.IsKnown(capability), $"{endpoint.RoutePattern.RawText} declares the unknown capability {capability}");
            }
        }

        // 只有登录（密码和 passkey）是匿名的
        Assert.Equal(["/api/admin/auth/login", "/api/admin/auth/passkey/login", "/api/admin/auth/passkey/options", "/api/admin/auth/setup"], endpoints.Where(e => e.Metadata.GetMetadata<CapabilityRequirement>()!.Capability is null).Select(e => e.RoutePattern.RawText!).Distinct().Order(StringComparer.Ordinal).ToArray());
    }

    [Fact]
    public void Catalog_ExpandsWritesToReads_AndPresetsAreConsistent()
    {
        Assert.Equal([Capability.FleetRead, Capability.FleetWrite], CapabilityCatalog.Expand([Capability.FleetWrite]));
        Assert.Contains(Capability.FleetRead, CapabilityCatalog.Expand([Capability.FleetEnroll]));
        foreach (CapabilityPreset preset in CapabilityCatalog.Presets)
        {
            Assert.All(preset.Capabilities, id => Assert.True(CapabilityCatalog.IsKnown(id), $"{preset.Id}: {id}"));
            Assert.Equal(CapabilityCatalog.Expand(preset.Capabilities).ToArray(), preset.Capabilities.Order(StringComparer.Ordinal).ToArray()); // 预设已经包含了蕴含的能力
        }

        Assert.All(CapabilityCatalog.All.Where(c => c.Id.EndsWith(".write", StringComparison.Ordinal)), c => Assert.Contains(c.Id[..^"write".Length] + "read", c.Implies));
    }

    private async Task<HttpClient> KeyAsync(params string[] capabilities)
    {
        using HttpResponseMessage created = await _backend.Admin.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = _backend.UniqueName("cap"), ["capabilities"] = BackendFixture.Capabilities(capabilities) }));
        string body = await created.Content.ReadAsStringAsync();
        Assert.True(created.StatusCode == HttpStatusCode.Created, body);
        HttpClient client = _backend.NewClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", JsonNode.Parse(body)!["plaintext"]!.GetValue<string>());
        return client;
    }

    [Fact]
    public async Task AKey_CanOnlyDoWhatItsCapabilitiesAllow_AndWriteImpliesRead()
    {
        using HttpClient reader = await KeyAsync(Capability.FleetRead);
        using HttpClient writer = await KeyAsync(Capability.FleetWrite); // 写蕴含读
        using HttpClient settings = await KeyAsync(Capability.SettingsRead);

        Assert.Equal(HttpStatusCode.OK, (await reader.GetAsync("/api/admin/agents")).StatusCode);
        Assert.Equal(HttpStatusCode.OK, (await writer.GetAsync("/api/admin/agents")).StatusCode);
        Assert.Equal(HttpStatusCode.Forbidden, (await settings.GetAsync("/api/admin/agents")).StatusCode);
        Assert.Equal(HttpStatusCode.Forbidden, (await reader.GetAsync("/api/admin/settings")).StatusCode);
        Assert.Equal(HttpStatusCode.Forbidden, (await reader.GetAsync("/api/admin/raw/chunks")).StatusCode);

        // 读不能写：fleet.read 的 key 不能生成加入代码，也不能创建 key
        using HttpResponseMessage enroll = await reader.PostAsync("/api/admin/join-tokens", BackendFixture.Json(new JsonObject { ["role"] = "agent" }));
        Assert.Equal(HttpStatusCode.Forbidden, enroll.StatusCode);
        using HttpResponseMessage keys = await reader.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "x", ["capabilities"] = BackendFixture.Capabilities(Capability.FleetRead) }));
        Assert.Equal(HttpStatusCode.Forbidden, keys.StatusCode);

        // 没有凭证是 401，凭证不够是 403
        Assert.Equal(HttpStatusCode.Unauthorized, (await _backend.Anonymous.GetAsync("/api/admin/agents")).StatusCode);
        // /auth/me 列出实际拥有的能力（包含蕴含的）
        JsonNode me = JsonNode.Parse(await (await writer.GetAsync("/api/admin/auth/me")).Content.ReadAsStringAsync())!;
        Assert.Equal([Capability.FleetRead, Capability.FleetWrite], me["capabilities"]!.AsArray().Select(c => c!.GetValue<string>()).ToArray());
    }

    [Fact]
    public async Task AKey_CannotGrantWhatItDoesNotHave_ButCanGrantASubset()
    {
        using HttpClient manager = await KeyAsync(Capability.KeysManage, Capability.FleetRead); // keys.manage 蕴含 keys.read
        using HttpResponseMessage beyond = await manager.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "x", ["capabilities"] = BackendFixture.Capabilities(Capability.FleetRead, Capability.FleetEnroll) }));
        Assert.Equal(HttpStatusCode.BadRequest, beyond.StatusCode);
        Assert.Contains("fleet.enroll", await beyond.Content.ReadAsStringAsync(), StringComparison.Ordinal);

        using HttpResponseMessage subset = await manager.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "sub", ["capabilities"] = BackendFixture.Capabilities(Capability.FleetRead) }));
        Assert.Equal(HttpStatusCode.Created, subset.StatusCode);

        using HttpResponseMessage unknown = await _backend.Admin.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "x", ["capabilities"] = BackendFixture.Capabilities("fleet.nope") }));
        Assert.Equal(HttpStatusCode.BadRequest, unknown.StatusCode);
        using HttpResponseMessage empty = await _backend.Admin.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "x", ["capabilities"] = new JsonArray() }));
        Assert.Equal(HttpStatusCode.BadRequest, empty.StatusCode);
    }

    [Fact]
    public async Task AKey_HasAnExpiry_AndTheCatalogEndpointDescribesEverything()
    {
        using HttpResponseMessage created = await _backend.Admin.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "short", ["capabilities"] = BackendFixture.Capabilities(Capability.FleetRead), ["expires_in_days"] = 1 }));
        JsonNode body = JsonNode.Parse(await created.Content.ReadAsStringAsync())!;
        Assert.NotNull(body["token"]!["expires_at"]);
        using HttpResponseMessage bad = await _backend.Admin.PostAsync("/api/admin/api-tokens", BackendFixture.Json(new JsonObject { ["name"] = "x", ["capabilities"] = BackendFixture.Capabilities(Capability.FleetRead), ["expires_in_days"] = 0 }));
        Assert.Equal(HttpStatusCode.BadRequest, bad.StatusCode);

        JsonNode catalog = await _backend.GetJsonAsync(_backend.Admin, "/api/admin/capabilities");
        string[] ids = [.. catalog["groups"]!.AsArray().SelectMany(g => g!["capabilities"]!.AsArray()).Select(c => c!["id"]!.GetValue<string>())];
        Assert.Equal(CapabilityCatalog.All.Select(c => c.Id).Order(StringComparer.Ordinal).ToArray(), ids.Order(StringComparer.Ordinal).ToArray());
        Assert.Contains(catalog["presets"]!.AsArray(), p => p!["id"]!.GetValue<string>() == "all");
        Assert.Contains(catalog["groups"]!.AsArray().SelectMany(g => g!["capabilities"]!.AsArray()), c => c!["id"]!.GetValue<string>() == Capability.FleetRevoke && c["trust"]!.GetValue<bool>());
    }

    [Fact]
    public async Task ReleaseKey_CanOnlyPublishReleases()
    {
        using HttpClient ci = await KeyAsync(Capability.ReleasePublish);
        Assert.Equal(HttpStatusCode.Forbidden, (await ci.GetAsync("/api/admin/agents")).StatusCode);
        Assert.Equal(HttpStatusCode.Forbidden, (await ci.GetAsync("/api/admin/backend/update")).StatusCode);
    }
}