using System;
using System.Linq;

namespace FileShare_Services.Core
{
    /// <summary>
    /// 端点列表打印工具 —— 在应用启动时输出所有已注册的拦截接口。
    /// 类似 Swagger 的接口清单效果。
    /// </summary>
    public static class EndpointPrinter
    {
        /// <summary>
        /// 打印所有已注册端点到控制台。
        /// </summary>
        public static void PrintEndpoints(
            ServiceEndpointCollection collection,
            string? title = null,
            EndpointHostTarget host = EndpointHostTarget.All)
        {
            title ??= "API Endpoints";
            var endpoints = collection.ForHost(host).ToList();

            var maxMethodLen = endpoints.Count > 0
                ? endpoints.Max(e => e.HttpMethod.Length)
                : 4;
            var maxPathLen = endpoints.Count > 0
                ? endpoints.Max(e => e.Pattern.Length)
                : 8;

            var totalWidth = maxMethodLen + maxPathLen + 5;
            var separator = new string('─', Math.Max(totalWidth, 50));

            Console.WriteLine();
            Console.WriteLine($"╔═ {title} ═{new string('═', Math.Max(0, totalWidth - title.Length - 3))}╗");
            Console.WriteLine($"║ {"Method".PadRight(maxMethodLen)} │ {"Path".PadRight(maxPathLen)} │ Auth ║");
            Console.WriteLine($"╟{separator}╢");

            foreach (var ep in endpoints.OrderBy(e => e.Pattern))
            {
                var auth = ep.RequireAuthorization
                    ? (ep.Roles.Count > 0 ? string.Join(",", ep.Roles) : ep.Policy ?? "✓")
                    : "—";
                var methodColor = ep.HttpMethod switch
                {
                    "GET" => ConsoleColor.Green,
                    "POST" => ConsoleColor.Blue,
                    "PUT" => ConsoleColor.Yellow,
                    "DELETE" => ConsoleColor.Red,
                    _ => ConsoleColor.Gray,
                };

                var savedColor = Console.ForegroundColor;

                Console.Write("║ ");
                Console.ForegroundColor = methodColor;
                Console.Write(ep.HttpMethod.PadRight(maxMethodLen));
                Console.ForegroundColor = savedColor;
                Console.Write(" │ ");
                Console.Write(ep.Pattern.PadRight(maxPathLen));
                Console.Write(" │ ");
                Console.Write(auth.PadRight(4));
                Console.WriteLine(" ║");
            }

            Console.WriteLine($"╚{separator}╝");
            Console.WriteLine($"  Total: {endpoints.Count} endpoint(s)");
            Console.WriteLine();
        }
    }
}