/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *--------------------------------------------------------------------------------------------*/

using GitHub.Copilot.Test.Harness;
using Xunit;
using Xunit.Abstractions;

namespace GitHub.Copilot.Test.E2E;

[Trait(E2ETestTraits.Backend, E2ETestTraits.CapiOnly)]
public class PerSessionAuthE2ETests(E2ETestFixture fixture, ITestOutputHelper output) : E2ETestBase(fixture, "per-session-auth", output)
{
    /// <summary>
    /// Creates a client with COPILOT_DEBUG_GITHUB_API_URL redirected to the proxy
    /// so per-session auth token resolution (fetchCopilotUser) is intercepted.
    /// </summary>
    private CopilotClient CreateAuthTestClient()
    {
        var env = new Dictionary<string, string>(Ctx.GetEnvironment())
        {
            ["COPILOT_DEBUG_GITHUB_API_URL"] = Ctx.ProxyUrl,
        };
        // Disable the harness's auto-injected client token so the per-session
        // auth tests validate only session-scoped tokens.
        return Ctx.CreateClient(environment: env, autoInjectGitHubToken: false);
    }

    private CopilotClient CreateNoAuthTestClient()
    {
        var env = WithoutAuthEnv(Ctx.GetEnvironment());
        env["COPILOT_DEBUG_GITHUB_API_URL"] = Ctx.ProxyUrl;

        return Ctx.CreateClient(options: new CopilotClientOptions
        {
            UseLoggedInUser = false,
        }, autoInjectGitHubToken: false, environment: env);
    }

    private static Dictionary<string, string> WithoutAuthEnv(Dictionary<string, string> env)
    {
        var result = new Dictionary<string, string>(env)
        {
            ["COPILOT_SDK_AUTH_TOKEN"] = "",
            ["GH_TOKEN"] = "",
            ["GITHUB_TOKEN"] = "",
        };

        return result;
    }

    private async Task SetupCopilotUsersAsync()
    {
        await Ctx.SetCopilotUserByTokenAsync("token-alice", new CopilotUserConfig(
            Login: "alice",
            CopilotPlan: "individual_pro",
            Endpoints: new CopilotUserEndpoints(Api: Ctx.ProxyUrl, Telemetry: "https://localhost:1/telemetry"),
            AnalyticsTrackingId: "alice-tracking-id"
        ));

        await Ctx.SetCopilotUserByTokenAsync("token-bob", new CopilotUserConfig(
            Login: "bob",
            CopilotPlan: "business",
            Endpoints: new CopilotUserEndpoints(Api: Ctx.ProxyUrl, Telemetry: "https://localhost:1/telemetry"),
            AnalyticsTrackingId: "bob-tracking-id"
        ));
    }

    private CopilotClient? _authClient;

    private CopilotClient AuthClient => _authClient ??= CreateAuthTestClient();

    [Fact]
    public async Task ShouldAuthenticateWithGitHubToken()
    {
        await SetupCopilotUsersAsync();

        await using var session = await Ctx.CreateSessionAsync(AuthClient, new SessionConfig
        {
            GitHubToken = "token-alice",
            OnPermissionRequest = PermissionHandler.ApproveAll,
        });

        var status = await session.Rpc.GitHubAuth.GetStatusAsync();
        Assert.True(status.IsAuthenticated);
        Assert.Equal("alice", status.Login);
    }

    [Fact]
    public async Task ShouldIsolateAuthBetweenSessions()
    {
        await SetupCopilotUsersAsync();

        await using var sessionA = await Ctx.CreateSessionAsync(AuthClient, new SessionConfig
        {
            GitHubToken = "token-alice",
            OnPermissionRequest = PermissionHandler.ApproveAll,
        });

        await using var sessionB = await Ctx.CreateSessionAsync(AuthClient, new SessionConfig
        {
            GitHubToken = "token-bob",
            OnPermissionRequest = PermissionHandler.ApproveAll,
        });

        var statusA = await sessionA.Rpc.GitHubAuth.GetStatusAsync();
        Assert.True(statusA.IsAuthenticated);
        Assert.Equal("alice", statusA.Login);

        var statusB = await sessionB.Rpc.GitHubAuth.GetStatusAsync();
        Assert.True(statusB.IsAuthenticated);
        Assert.Equal("bob", statusB.Login);
    }

    [Fact]
    public async Task ShouldBeUnauthenticatedWithoutToken()
    {
        var noAuthClient = CreateNoAuthTestClient();

        await using var session = await Ctx.CreateSessionAsync(noAuthClient, new SessionConfig
        {
            OnPermissionRequest = PermissionHandler.ApproveAll,
        });

        var status = await session.Rpc.GitHubAuth.GetStatusAsync();
        // Without a per-session GitHub token, there is no per-session identity.
        Assert.True(string.IsNullOrEmpty(status.Login), $"Expected no per-session login without token, got {status.Login}");
    }

    [Fact]
    public async Task ShouldFailWithInvalidToken()
    {
        await SetupCopilotUsersAsync();

        var ex = await Assert.ThrowsAnyAsync<Exception>(() => Ctx.CreateSessionAsync(AuthClient, new SessionConfig
        {
            GitHubToken = "invalid-token",
            OnPermissionRequest = PermissionHandler.ApproveAll,
        }));
        Assert.Contains("401 Unauthorized", ex.ToString(), StringComparison.OrdinalIgnoreCase);
    }
}