using LMS.Repository.DB;
using Microsoft.EntityFrameworkCore;

namespace LMS.DAO.OptionDAO
{
    public class OptionGlobalDAO(ApplicationDbContext dbContext)
    {
        private readonly ApplicationDbContext _dbContext = dbContext;
        /// <summary>
        /// 根据配置键查找并返回指定类型的配置值
        /// </summary>
        /// <typeparam name="T">返回值类型</typeparam>
        /// <param name="optionKey">配置键</param>
        /// <returns>配置值，如果不存在或转换失败则返回默认值</returns>
        public async Task<T?> FindAndReturnOption<T>(string optionKey)
        {
            // 参数验证
            if (string.IsNullOrWhiteSpace(optionKey))
            {
                return default(T);
            }

            var options = await _dbContext.Options
                .Where(x => x.Key == optionKey)
                .FirstOrDefaultAsync();

            if (options == null) return default;
            // 直接返回转换结果，GetValueObject内部应该处理null情况
            return options.GetValueObject<T>() ?? default;
        }

        /// <summary>
        /// 检查配置是否存在
        /// </summary>
        /// <param name="optionKey">配置键</param>
        /// <returns>是否存在</returns>
        public async Task<bool> OptionExists(string optionKey)
        {
            if (string.IsNullOrWhiteSpace(optionKey))
            {
                return false;
            }

            return await _dbContext.Options
                .AnyAsync(x => x.Key == optionKey);
        }

        /// <summary>
        /// 获取多个配置
        /// </summary>
        /// <param name="optionKeys">配置键列表</param>
        /// <returns>配置字典</returns>
        public async Task<Dictionary<string, Options>> GetMultipleOptions(params string[] optionKeys)
        {
            if (optionKeys == null || optionKeys.Length == 0)
            {
                return new Dictionary<string, Options>();
            }

            var options = await _dbContext.Options
                .Where(x => optionKeys.Contains(x.Key))
                .ToListAsync();

            return options.ToDictionary(x => x.Key, x => x);
        }
    }
}