using Authentication;
using Avalonia_Common.Core;
using Avalonia_Services.Core;
using Avalonia_Services.Services.AuthService;
using System;
using System.Text.Json;
using System.Threading.Tasks;

namespace Avalonia_PC.Authentication
{
    public sealed class PcAuthEndpointService(PcGlobalTokenService tokenService) : IPcAuthEndpointService
    {
        private static readonly JsonSerializerOptions JsonOptions = new()
        {
            PropertyNameCaseInsensitive = true,
        };

        public async Task<object?> AuthorizeAsync(ServiceEndpointContext ctx)
        {
            var request = Deserialize<PcAuthorizeRequest>(ctx.Body);
            var token = await tokenService.AuthorizeAsync(request?.AuthorizationCode);
            if (token is null)
            {
                ctx.StatusCode = 401;
                return ResponseHelper.Failure(401, "授权失败");
            }

            return ResponseHelper.Ok(token, "授权成功");
        }

        public async Task<object?> RefreshAsync(ServiceEndpointContext ctx)
        {
            var request = Deserialize<PcRefreshRequest>(ctx.Body);
            var token = request?.Token ?? ExtractBearerToken(ctx.GetHeader("Authorization"));
            var refreshed = await tokenService.RefreshAsync(token);
            if (refreshed is null)
            {
                ctx.StatusCode = 401;
                return ResponseHelper.Failure(401, "授权已失效");
            }

            return ResponseHelper.Ok(refreshed, "刷新成功");
        }

        public Task<object?> LogoutAsync(ServiceEndpointContext ctx)
        {
            var request = Deserialize<PcLogoutRequest>(ctx.Body);
            var token = request?.Token ?? ExtractBearerToken(ctx.GetHeader("Authorization"));
            tokenService.Logout(token);
            return Task.FromResult<object?>(ResponseHelper.Succeed("退出成功"));
        }

        private static T? Deserialize<T>(string? body)
        {
            return string.IsNullOrWhiteSpace(body)
                ? default
                : JsonSerializer.Deserialize<T>(body, JsonOptions);
        }

        private static string? ExtractBearerToken(string? authorization)
        {
            if (string.IsNullOrWhiteSpace(authorization))
            {
                return null;
            }

            const string prefix = "Bearer ";
            return authorization.StartsWith(prefix, StringComparison.OrdinalIgnoreCase)
                ? authorization[prefix.Length..].Trim()
                : authorization.Trim();
        }
    }
}