using System.Configuration;

namespace XP.Common.Logging.Configs
{
    /// <summary>
    /// Serilog 配置加载器，从 App.config 读取日志相关配置项 | Serilog configuration loader, reads logging-related configuration from App.config
    /// </summary>
    public static class ConfigLoader
    {
        /// <summary>
        /// 配置键前缀 | Configuration key prefix
        /// </summary>
        private const string KeyPrefix = "Serilog:";

        /// <summary>
        /// 从 App.config 加载 Serilog 配置 | Load Serilog configuration from App.config
        /// </summary>
        /// <returns>Serilog 配置实体，缺失或无效配置项使用默认值 | Serilog configuration entity, uses default values for missing or invalid items</returns>
        public static SerilogConfig LoadSerilogConfig()
        {
            var config = new SerilogConfig();

            // 加载日志路径 | Load log path
            var logPath = ConfigurationManager.AppSettings[KeyPrefix + "LogPath"];
            if (!string.IsNullOrEmpty(logPath)) config.LogPath = logPath;

            // 加载最低日志级别 | Load minimum level
            var minLevel = ConfigurationManager.AppSettings[KeyPrefix + "MinimumLevel"];
            if (!string.IsNullOrEmpty(minLevel)) config.MinimumLevel = minLevel;

            // 加载是否输出到控制台 | Load enable console
            var enableConsole = ConfigurationManager.AppSettings[KeyPrefix + "EnableConsole"];
            if (bool.TryParse(enableConsole, out var console)) config.EnableConsole = console;

            // 加载日志文件分割规则 | Load rolling interval
            var rollingInterval = ConfigurationManager.AppSettings[KeyPrefix + "RollingInterval"];
            if (!string.IsNullOrEmpty(rollingInterval)) config.RollingInterval = rollingInterval;

            // 加载单个日志文件最大大小 | Load file size limit
            var fileSize = ConfigurationManager.AppSettings[KeyPrefix + "FileSizeLimitMB"];
            if (long.TryParse(fileSize, out var size) && size > 0) config.FileSizeLimitMB = size;

            // 加载保留日志文件数量 | Load retained file count limit
            var retainCount = ConfigurationManager.AppSettings[KeyPrefix + "RetainedFileCountLimit"];
            if (int.TryParse(retainCount, out var count) && count > 0) config.RetainedFileCountLimit = count;

            return config;
        }
    }
}