using GiteaMcp.Config;
using Microsoft.Extensions.Options;

namespace GiteaMcp.Endpoints;

/// <summary>
/// OAuth 2.0 Authorization Server Metadata（RFC 8414）端点。
/// Claude.ai 在接入 custom connector 时会先访问 /.well-known/oauth-authorization-server，
/// 根据返回的元数据找到 nas-auth 的 authorize / token / register 端点。
/// </summary>
public static class DiscoveryEndpoints
{
    public static IEndpointRouteBuilder MapDiscovery(this IEndpointRouteBuilder app)
    {
        app.MapGet("/.well-known/oauth-authorization-server", (IOptions<McpDiscoveryOptions> opts) =>
        {
            var o = opts.Value;
            return Results.Ok(new
            {
                issuer = o.Issuer,
                authorization_endpoint = o.AuthorizationEndpoint,
                token_endpoint = o.TokenEndpoint,
                registration_endpoint = o.RegistrationEndpoint,
                response_types_supported = new[] { "code" },
                grant_types_supported = new[] { "authorization_code", "refresh_token" },
                code_challenge_methods_supported = new[] { "S256" },
                scopes_supported = new[] { "read:gitea" },
            });
        });

        return app;
    }
}