using FreeSql;

using LiveForum.IService.Cdk;
using LiveForum.IService.Others;
using LiveForum.Model;
using LiveForum.Model.Dto.Cdk;

namespace LiveForum.Service.Cdk
{
    /// <summary>
    /// CDK服务实现
    /// </summary>
    public class CdkService : ICdkService
    {
        private readonly IBaseRepository<T_CDKs> _cdkRepository;
        private readonly IBaseRepository<T_Users> _userRepository;
        private readonly ISystemSettingsService _systemSettingsService;

        /// <summary>
        /// CDK功能开关配置键
        /// </summary>
        public const string CDK_ENABLED_KEY = "cdk_enabled";

        /// <summary>
        /// 构造函数
        /// </summary>
        public CdkService(
            IBaseRepository<T_CDKs> cdkRepository,
            IBaseRepository<T_Users> userRepository,
            ISystemSettingsService systemSettingsService)
        {
            _cdkRepository = cdkRepository;
            _userRepository = userRepository;
            _systemSettingsService = systemSettingsService;
        }

        /// <summary>
        /// 检查CDK状态
        /// </summary>
        public async Task<CdkStatusDto> CheckCdkStatusAsync(long userId)
        {
            // 获取CDK功能是否启用
            var cdkEnabled = await _systemSettingsService.GetSettingAsync(CDK_ENABLED_KEY);
            var isCdkEnabled = string.Equals(cdkEnabled, "true", StringComparison.OrdinalIgnoreCase);

            // 获取用户CDK激活状态
            var user = await _userRepository.Select
                .Where(x => x.Id == userId)
                .FirstAsync();

            var isActivated = user?.IsCdkActivated ?? false;

            return new CdkStatusDto
            {
                CdkEnabled = isCdkEnabled,
                IsActivated = isActivated
            };
        }

        /// <summary>
        /// 激活CDK
        /// </summary>
        public async Task<string> ActivateCdkAsync(long userId, string code)
        {
            if (string.IsNullOrWhiteSpace(code))
            {
                return "请输入有效 CDK";
            }

            // 查找CDK
            var cdk = await _cdkRepository.Select
                .Where(x => x.Code == code.Trim())
                .FirstAsync();

            // CDK不存在
            if (cdk == null)
            {
                return "请输入有效 CDK";
            }

            // CDK已被使用
            if (cdk.Status == 1)
            {
                return "该 CDK 已被激活";
            }

            // 获取用户
            var user = await _userRepository.Select
                .Where(x => x.Id == userId)
                .FirstAsync();

            if (user == null)
            {
                return "用户不存在";
            }

            // 用户已激活
            if (user.IsCdkActivated)
            {
                return "您已激活过 CDK";
            }

            var now = DateTime.Now;

            // 更新CDK状态
            cdk.Status = 1;
            cdk.UsedByUserId = userId;
            cdk.UsedAt = now;
            await _cdkRepository.UpdateAsync(cdk);

            // 更新用户CDK激活状态
            user.IsCdkActivated = true;
            user.CdkActivatedAt = now;
            await _userRepository.UpdateAsync(user);

            return "CDK 激活成功";
        }

        /// <summary>
        /// 检查用户是否需要CDK激活才能进行互动操作
        /// </summary>
        public async Task<bool> RequiresCdkActivationAsync(long userId)
        {
            // 获取CDK功能是否启用
            var cdkEnabled = await _systemSettingsService.GetSettingAsync(CDK_ENABLED_KEY);
            var isCdkEnabled = string.Equals(cdkEnabled, "true", StringComparison.OrdinalIgnoreCase);

            // 如果CDK功能未启用，不需要激活
            if (!isCdkEnabled)
            {
                return false;
            }

            // 获取用户CDK激活状态
            var user = await _userRepository.Select
                .Where(x => x.Id == userId)
                .FirstAsync();

            // 如果用户已激活，不需要激活
            if (user?.IsCdkActivated == true)
            {
                return false;
            }

            // 需要激活但未激活
            return true;
        }
    }
}